HomeMy WebLinkAboutChester Lake Project Feasibility Report 1982A!.ASKA pm~'ER A!Jr~C:,1ITY
CHESTER LAKE PROJECT
FEASIBILITY REPORT
Prepared by
Harza Engineering Company
May 1982
ALASKA POWER AlTTHORITY _
'IETLAKATLA POWER & LIGHT
l--IAR..ZA ENGINEERING COMPANY CONSULTING ENGINEE"'S
Alaska Power Authority
334 West 5th Avenue
Anchorage, Alaska 99501
Attention: Mr. Eric P. Yould
Executive Director
Subject: Chester Lake Hydroelectric Project
Feasibility Study
Gentlemen:
May 21, 1982
We are pleased to present the result of our feasibility study
of the Chester Lake Project. The study includes a review and
update of an existing Definite Project Report on the Chester Lake
Project, consideration of alternative developments of the Chester
Lake resource, consideration of other means of meeting the fore-
cast electrical loads, a technical, economic, financial and en-
vironmental evaluation of the project, an electrical load fore-
cast, and an economic and financial analysis of alternative heat-
ing technologies. The following briefly describes the project and
the studies which were made.
Review and Updating of Previous Report
The initial step of the present study was to review and up-
date the July 1977 Definite Project Report on the Chester Lake
Project. The basic data presented in the report concerning the
hydrologic, geologic and environmental aspects of the project were
reviewed and supplemented by data which has become available sub-
sequent to July 1977. The engineering concepts presented in the
previous report were reviewed and, in some cases, modified as
discussed in Chapter I.
Mapping and Surveys
In November and December 1981 a field surveying program was
conducted at the project site by our subcontractor, Charles Pool &
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Associates, Inc. of Ketchikan, Alaska. The field program included
ground surveying of the damsite and powerhouse site topography,
penstock profile, potential access road route (including a hydro-
graphic survey of Port Chester between Waterfall Creek and Walden
Point Road), and establishment of horizontal and vertical control
points for photogrametric mapping. The data collected during the
field program was used to produce topographic maps and ground
surface profiles which are suitable for project design.
Geotechnical Investigations
An exploratory drilling program was conducted in November and
December 1981 by our subcontractor, Salisbury & Dietz Inc. of
Spokane, Washington. The program was monitored by our field geo-
logist and consisted of 560 feet of drilling in 11 holes. Drill
cores were logged to determine the bedrock quality and water pres-
sure tests were performed to determine the permeability of the
bedrock at the damsite and in the powerhouse area. Geologic
mapping of the damsite, penstock route and powerhouse site and
reconnaissance level mapping of the general project area were
performed by our field geologist. A reconnaissance of available
sources of construction materials was also conducted.
The Chester Lake Project
To determine the optimum development of the resource at
Chester Lake three alternative project plans were investigated.
The configuration of all of the alternative developments of
Chester Lake are generally Similar, consisting of a concrete dam
downstream of the existing water supply dam, a steel surface pen-
stock and a sea level powerhouse with a single generating unit.
The three alternatives vary in reservoir storage capacity and
installed capacity as follows:
Alternative Elevation Usable Storage Ca2acit:l
Acre-feet kW
1 885 4180 2,500
2 845 0 2,500
3 845 0 1,500
To compare the 1500 kW development with the 2500 kW installa-
tions, Alternative 3 was considered to be part of a combined
development involving a 1000 kW expansion of the Purple Lake
Project.
Alternative Projects
This study includes a comparison of the Chester Lake Project
with alternative means of satisfying the area's power needs so
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that the Power Authority can recommend for or against construction
of Chester Lake. The principal alternative projects identified
during the course of this study are: continued use of diesel
generation, installation of additional capacity and raising of the
reservoir at the Purple Lake Hydroelectric Project, the Triangle
Lake Hydroelectric Project on northeastern Annette Island, and
installation of a wood-fired steam-electric plant near Metla-
katla.
Diesel Generation Alternative. This alternative consists of
continued use of the two eXlsting 1.5 MW diesel generators at the
Quarry Diesel Plant. The diesel units would be replaced with new
units after twenty years service. Additional diesel capacity
would be added as required to meet the increasing peak demand.
Purple Lake Alternative. An investigation was made of modi-
ficatlons to~ eXlstlng Purple Lake Project to increase the
project's capacity and energy production. Studies reveal that the
project already has the cabability to utilize nearly all of the
available runoff so that little energy would be gained by raising
the reservoir. The capacity of the project could be increased to
4.0 MW by the addition of a fourth generating unit. Water for
power generation would be provided to the new unit by tapping the
existing penstock. This installation, by its~lf, provides too
little new capacity and energy to be considered an alternative to
the 2.5 MW Chester Lake Project but, as noted previously, it was
considered in combination with a 1.5 MW Chester Lake development.
Increasing the size of the project's drainage area by constructing
a new dam downstream of the present structure was also studied.
Because of the limited size of the impoundment structure this
alternative is not economically feasible. Thus, it appears from
these studies that modifications to the Purple Lake Project, only,
would not contribute significantly to the Metlakatla Power and
Light system and should not be considered as an alternative to the
Chester Lake Project. However, installation of a fourth unit at
Purple Lake in combination with a 1.5 MW Chester Lake development
was investigated as an alternative to 2.5 MW development of
Chester Lake.
Triangle Lake Alternative. The Triangle Lake Hydroelectric
Project would se-Iocated in northeastern Annette Island and would
develop the head between the lake and Hassler Harbor on the
Revillagigedo Channel. The project would consist of a dam and
spillway, intake and one-mile long water conductor, a sea level
powerhouse and switchyard, and a 12 mile long transmission line.
The installed capacity of the project would be 3.0 MW and its
estimated average annual energy output would be 11,000,000 kWh.
The cost of the project at January 1982 price levels, is estimated
to be $22.7 million.
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Woodwaste Generation Alternative. Louisiana Pacific Corpora-
tion operates the existing sawmlll on Annette Island. The wood-
waste generation alternative could generate electric power by
using the woodwaste produced by the mill to fuel a steam-electric
plant located nearby. Discussions with Louisana Pacific, however,
indicate that the waste material from the Annette Island sawmill
is already being used for fuel in their Ketchikan facility. In
addition, sawmill operations are intermittant and may not provide
a reliable source of fuel for power generation. Based on these
factors and the high cost of energy produced by a wood fired
generating plant this is a less favorable alternative than either
diesel or hydro generation.
Electric Load Forecast
A description of Metlakatla's population, economy, historical
energy demand and electrical load forecast is in Chapter II of
this report. Three scenarios are used in the forecast: low, most
likely and high. These scenarios project population, commerical
and industrial growth at different rates and estimate correspond-
ing electrical peak power and energy demand. In 1980 the peak
demand was 4,770 kW and the total energy generated was 17,688 MWh.
The existing Purple Lake Hydro Plant, with an installed capacity
of 3,000 kW, generated 14,994 MWh and the Quarry Diesel Plant of
3,000 kW capacity generated 2,694 KWh. The three Purple Lake
units have a nameplate rating of 1,000 kW each. Forecasts under
the three scenarios show that in 1985 the peak generation will be
5,040 kW for low growth, 5,580 kW for most likely growth, and
6,100 kW for high growth. The corresponding annual energy gene-
ration would be 19,850 MWh, 22,010 KWh and 24,060 MWh at the
generating plants, respectively.
Economic Analyses
The economic analysis, for the project is based on criteria
established by the Alaska Power Authority in accordance with State
feasibility study regulations. In accordance with those regula-
tions, a "base case" plan, a "preferred" plan and a "second most
preferred" plan were developed.
The power market would continue to be served by the existing
Purple Lake Hydroelectric Project supplemented by diesel units
under the Base Case Plan. The Preferred Plan would be the Purple
Lake Project supplemented by the Chester Lake Project. The Second
Most Preferred Plan would be the Purple Lake Project supplemented
by the Triangle Lake Project.
As previously noted, three alternative development plans for
the Chester Lake Project were investigated. An economic compari-
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son of the three alternative indicates that the 2.5 MW project
with reservoir El 885 is the most favorable development for the
most likely and high scenarios of load growth. This development
of Chester Lake was therefore selected as part of the Preferred
Plan for comparison with the other plans of system expansion.
An economic analysis of the alternative system expansion
plans, using present worth method, indicates that the Preferred
Plan is the most favorable one. The values given below are based
on most likely load growth using 50 year project life for compari-
son. In the analysis the future annual costs of amortization,
operation and maintenance, and diesel fuel are discounted to year
1982 at 3 percent rate of interest. All alternative plans will
serve full capacity and energy demand throughout the SO year pro-
ject life.
Plan
Base Case
Preferred (Chester Lake)
Second Most Preferred
(Triangle Lake)
Present Worth(-cost)
S Million
54.34
30.95
37.18
Alternative residential heating technologies have been inves-
tigated and an economic analysis of the alternatives was perform-
ed. The economic analysis shows that, the cost of energy from the
Chester Lake Project, heating by electrical resistance is less
expensive than fuel oil heating after 1989. The least cost alter-
native for all years studied is wood heating but this alternative
is expected to continue as a supplemental energy source because of
its inconvenience and time-consuming operation.
Financial Analyses
The cost of energy from the entire generation system and from
the Chester Lake Project alone were estimated under four alterna-
tive financing plans. The cost of energy was computed for each of
the three alternative developments of Chester Lake and for the
most likely and low load growth scenarios. For comparison, the
cost of energy for the Base Case is also presented. The four
financing plans selected for study are the following: funding by
35-year 12% revenue bonds, by a 35-year 5% loan, funding to yield
a 5% rate of return (covering capital and O&M costs) or by a com-
bination of 5% and 13% loans. The results of these studies are
shown on Exhibits 19 and 22 of the report.
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Analyses were also performed to determine the sensitivity of
the cost of residential electric heating that results from Chester
Lake financing alternatives. The analyses were performed for both
the most likely and low load growth scenarios.
For the most likely scenario the analyses show that the cost
of electric resistance heating becomes less than that of oil heat-
ing in 1992 with 12% financing, in 1988 with a 5% loan, in 1986
with a 5% rate of return, and in 1990 with 5%/13% combined financ-
ing. When compared to $120/cord wood heating, electric heating
becomes more economical in 1990 for 5% rate of return financing
and in 1993 for 5% loan financing. For the other financing alter-
natives wood heating is the least cost option during the entire
study period.
For the low scenario the cost of electric heat is less than
that of oil heat starting in 1993 for 12% financing, in 1988 for a
5% loan, in 1987 for a 5% rate of return, and in 1991 for 5%/13%
combined financing. Electric heating becomes more attractive than
$120 per cord wood heating in 1994 for 5% loan financing of Chest-
er Lake and in 1991 for 5% rate of return financing. As in the
high scenario, wood heating is the least cost option when compared
to the other two financing alternatives considered.
The Recommended Project
The recommended project is the Chester Lake Project located
one mile east of Metlakatla, on Annette Island in Southeast Alas-
ka. The recommended alternative of the Chester Project is the
storage project with reservoir elevation 885. The project will
regulate and di~ert the outflow of Chester Lake, and will have a
rated net head of 800 feet and an installed capacity of 2,500 kW.
With an average flow of 22 cfs, the project will generate an aver-
age of 10,300 MWh per year. Firm energy generation will be 7,900
MWh per year.
The recommendation of the El. 885 storage project is based on
the results of the economic analysis, which shows this configura-
tion of the Chester Lake Project to have the least present worth
cost under the most likely scenario of load growth. The system
energy costs will vary widely depending on the terms of the fi-
nancing secured for implementation of the Chester Lake Project.
Electric energy costs on Annette Island are now on the order of
4.5 cents per kilowatt hour. With favorable financing of the
Chester Lake Project, system energy costs will be maintained in
the range of 5.0 to 7.5 cents per kilowatt hour through 1990. If
system energy costs rise above about 8 cents per kilowatt residen-
tial energy consumers could be driven to other energy sources for
space heating, subsequently diminishing the load growth.
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Given such circums~~nces, the determination of whether to
build the 2.5 MW storage project or the 2.5 MW run of river proJ-
ect at Chester Lake should be delayed until the terms of financing
for project implementation are known.
project Description. The Table of Significant Data for the
project 1S shown in Exhlbit A. The project will consist of a darn
with spillway and intake, water conductor, powerhouse, substa-
tion, access road and transmission line.
An 80-foot high concrete arch-gravity darn will be built
across Waterfall Creek at the outlet of Chester Lake downstream of
the existing water supply dam. The dam will raise the existing
lake level 40 feet, to El. 885, creating a reservoir with 4180
acre-feet of live storage. An uncontrolled spillway will be
located in the center portion of the dam and will have a discharge
capacity of 1000 cfs.
A single-port intake and penstock 28 inches in diameter which
will pass through the darn will conduct water from the dam to the
powerhouse. The 2,800 feet long penstock will be supported on
saddles with concrete anchor blocks provided at major bends.
The powerhouse will be a reinforced concrete building con-
taining one Francis type turbine-generator unit with a rating of
2500 kW. A substation containing a step-up transformer will be
built adjacent to the powerstation. Power from the project will
be transmitted to the Metlakatla Power and Light transmission
system over a 12.5 kV wood pole transmission line having a total
length of 2800 feet.
Access to the powerstation will be by barge or boat, and by
foot via a wooden walkway from the end of Walden Point Road.
Access to the dam will be by helicopter or via the existing foot
path south of Waterfall Creek.
Geotechnical Aspects. The proposed Chester Lake dam will
be founded on the sound igneous bedrock, probably foliated grano-
diorite with near vertical foliation planes dipping upstream. The
proposed site will provide an adequate foundation and the location
is technically feasible. The bedrock is of sufficient quality and
uniformity to support a concrete arch-gravity dam. Weathering of
the rock mass is very shallow. Jointing is well developed in the
form of near horizontal stress-relief joints and near vertical
joint sets, both of which influenced the selection of the dam
type.
Foundation treatment is proposed beneath the entire dam and
will include a 40 feet deep grout curtain, drainage holes, minor
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rock trimming and minor rock bolting, following foundation excava-
tion.
The proposed penstock will be founded on bedrock. Rock an-
chorage will be provided at thrust block foundations to prevent
sliding.
The powerhouse will be located on bedrock immediately north
of Waterfall Creek. The powerhouse structure will be notched into
the 45 degree rock slope which will undercut foliation planes.
Anchorage will be designed above the proposed excavation to main-
tain rock slope stability.
Environmental ASp!ctS. The Rural Electrification Administra-
tion, in ltS Final EnVlronmental Statement of September 1980,
reached a Finding of No Significant Impact for the Chester Lake
Hydroelectric Project after consultation with State of Alaska and
federal resource agencies. Consequently, no additional investiga-
tion of the environmental aspects of the project are deemed neces-
sary and none were performed in the course of this study.
Project Costs. The construction cost of the project includes
the direct cost of civil works, contractor's overhead and profit,
purchase and installation of equipment, contingencies, engineering
and owner's administration, but excludes interest during construc-
tion and price escalation beyond the date of the estimate. The
estimated construction cost of the project, at January 1982 price
level is $13,140,000. A summary of the cost estimate is given as
Exhibit B.
Operation and maintenance costs at the January 1982 price
level for the Chester Lake Project including transmission are
estimated to be $65,000 per year.
Project Implementation. The implementation of the Chester
Lake ProJect is estlmated to require 34 months from authorization
to proceed with engineering to project completion. The design and
contract document phase of the project would take an estimated 10
months. One contract will be prepared for supply of the major
generating equipment items and one for project construction and
equipment installation.
Assuming that authorization to commence with engineering is
granted by March 1, 1982, the contracts for equipment supply and
general construction could be awarded in September 1982 and Decem-
ber 1982 respectively. Project construction would take an esti-
mated 24 months. Commercial operation of the project could begin
in January 1985.
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Conclusions
We find that the Chester Lake Project is technically, econo-
mically and environmentally feasible. As demonstrated by the
electric load forecast and economic and financial analyses summa-
rized herein, the project, if placed in operation in 1985, will
meet the growing energy requirements of the Metlaktla Power and
Light system. We therefore recommend that the design phase of the
project be authorized subsequent to determination of the terms of
financing for project implementation.
The Triangle Lake Project appears to be the next most attrac-
tive hydro development on Annette Island after Chester Lake. We
recommend that a gaging station be established in the near future
to record stream flow from Triangle Lake and that environmental
data collection begin now to provide a reliable basis for feasi-
bility studies.
We will be pleased to assist the Power Authority and Met-
lakatla Power & Light in implementing the Chester Lake Project.
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Very truly yours,
K. R. Leonardson
Project Manager
TABLE OF SIGNIFICANT DATA
CHESTER LAKE HYDROELECTRIC PROJECT
RESERVOIR
Water Surface Elevation, ft above mean lower
low water (mllw)
Normal Maximum
Minimum
Tailwater Elevation, ft mllw
Surface Area at Normal Max. El., acres
Estimated Useable Storage, acre-feet
Type of Regulation
HYDROLOGY
DAM
Drainage Area, sq mi
Average Annual Runoff, cfs/mi 2
Streamflow, Average Annual, cfs
Type
Maximum Height, ft above
Crest Elevation, ft mllw
Crest Length, ft
Dam Vol wne, cy
Concrete
deepest excavation
SPILLWAY
Exhibit A
Page 1 of 2
885.0
845.0
22.0
139
4180
Seasonal
1. 62
13
22
Arch-Gravity
80
890
220
5,000
Type
Crest Elevation, ft mllw
Width, ft
Design Discharge, cfs
Uncontrolled overflow
885.0
25.0
1,000
WATER CONDUCTOR
Type
Diameter, in.
Length, ft
Shell Thickness, in. (maximum)
Steel Penstock
28
2,800
0.313
Exhibit A
Page 2 of 2
TABLE OF SIGNIFICANT DATA (Cont'd)
POWERSTATION
Number of Units
Turbine Type
Rated Net Head, ft
Generator Unit Rating, kW
POWER AND ENERGY
Installed Capacity, kW
Firm Annual Energy Generation, MWh
Average Plant Factor %
1
Standard Francis
800
2,500
2,500
7,900
47
CONSTRUCTION COST
Item
1. Mobilization
2. Cableway Access to Dam Site
3. Dam, Spillway & Intake
4. Penstock
5. Powerhouse
6. Access Road to Powerhouse
7. Mechanical & Electrical Equipment
8. Transmission Line
Subtotal
+ 15% Contingency Allowance On All Items
Except No.7.
+ 10% Contingency Allowance on Item No. 7_
Engineering
Owner's Overhead & Administration
Total Construction Cost at
January, 1982 Price Level
Exhibit B
Costs
$ 485,000
1,624,000
2,869,020
897,300
800,550
1,055,000
1,972,000
70,000
$ 9,772,850
1,170,150
197,000
1,300,000
700,000
$13,140,000
Chapter I
INTRODUCTION
Authorization
This study was performed under a contract between the Alaska
Power Authority and Harza Engineering Company, effective October
21, 1981 and subsequent amendments. Funds for the study were
provided by the State of Alaska. Parts of work were performed
under subcontracts with Charles Pool and Associates, Inc., for
topographic surveys and mapping: and Salisbury and Dietz, Inc.,
for drilling for subsurface geotechnical investigations.
Purpose and Scope of Report
This report documents the results of feasibility studies of
the Chester Lake Project located near Metlakatla on Annette Island
in Southeast Alaska. The objectives of the study are to review
update and expand the detail of previous studies which indicated
that the project was sufficiently attractive to warrant construc-
tion.
The scope of the study includes the following work tasks:
1. Review and update the 1977 Definite Project Report on
the Chester Lake Project.
2. Prepare an electrical load forecast for a 20 year
period.
3. Survey and map the project area.
4. Geotechnical investigation of the project site including
subsurface exploration.
5. Evaluate various means of access for construction and
operation of the project.
6. Prepare cost estimates, operation analyses and economic
evaluations of three alternative plans of development of
Chester Lake.
7. Prepare a design and construction schedule for the
selected Chester Lake development.
8. Evaluate the economic feasibility of the selected
development project.
1-1
9. Investigate four specific power generation alternatives
to the Chester Lake Project.
10. Prepare an economic evaluation of alternative heating
technologies.
11. Estimate the busbar cost of energy from the Chester Lake
Project alone and from the entire MP&L system as a fun-
ction of four specific alternatives of project finan-
cing.
12. Prepare the final report documenting the studies.
Background and Previous Studies
The existing electrical generation and distribution system
serving the Metlakatla Indian Community was first established in
1927 when the one unit, 150 kW, Chester Lake Hydroelectric Project
commenced operation. In 1937 a second hydropower unit, of 250 kW
capacity, was added to the Chester Lake Project. Further addi-
tions to the system generating capacity were made in 1956 when two
1000 kw units were installed at the Purple Lake Hydroelectric
Project. In 1962 a third 1000 kW unit was installed at Purple
Lake. The latest additions to the system were two 1500 kW diesel
powered generators at the Quarry Diesel Plant, the first installed
in 1967 and the second in 1970.
Operation of the Chester Lake plant ceased in 1956 when the
first ?~rple Lake units came on-line. The Chester Lake ~nstocks
and powerhouse have since been abandoned. The old concrete darn
continues to maintain Chester Lake at its present elevation for
municipal water supply for Metlakatla. The darn was inspected in
1976 and found to be in disrepair with substaintial leakage noted
through cracks in the structure and along its foundation. Re-
placement of the structure was recommended.
The Metlakatla Indian Community has been operating its own
power system since 1927. Recent increases in fuel cost have had a
detrimental effect on the community as indicated by a 13% decline
in annual energy utilization by the commerical sector in 1979
following a major increase in the electricity tariff. Studies to
replace diesel generation with hydropower were begun in the mid
1970's. Redevelopment of Chester Lake for hydropower generation
was investigated in a feasibility stud yllprepared for the Indian
Community in 1977. That study found that the project was
II Robert W. Retherford Associates, Definite Project Report,
Chester Lake Hydroelectric Project, July 1977.
1-2
sufficiently attractive to warrant construction, but delays
relating to the licensing and funding of the project have
prevented its implementation. The delays have also resulted in a
substantial increase in t~e project cost. The present
investigations have been undertaken to update the previous
studies.
The 1977 report was reviewed and the following points will be
covered in the applicable section of this report:
1. Additional consideration should be given to the type of
dam and spillway selected.
2. The penstock should be studied to determine the most
economical diameter.
3. The powerhouse location and structural arrangement
appeared to be risky as it involved excavation into a
large talus slope.
4. The hydrology studies appeared to be reasonably accurate
for spillway capacity and power and energy determination
for the proposed project. The studi~s should be updated
to include the most recent data available.
5. Additional surveying and mapping would be needed for
design and also needed to determine reservoir area and
volume and to estimate project costs more accurately.
6. A drilling program for geotechnical investigation of
foundations for structures, especially the dam and
powerhouse are needed.
7. The estimates of project costs need to be updated for
escalation that occurred since 1977 and all project
quantities and unit prices should be re-estimated based
on this independent study and investigation.
8. The load forecast was not reviewed because a separate
forecast was required for this study.
9. An independent economic and financial analyses in
accordance with APA guidelines will be made; therefore,
these subjects were not reviewed.
Acknowledgements
We acknowledge and appreciate the valuable assistance and
advice offered by staffs of the following agenices:
I-3
Alaska Power Authority
Metlakatla Power & Light
Metlakatla Indian Community
Louisiana Pacific Corporation
1-4
Chapter II
ELECTRIC LOAD FORECAST
Introduction
Annette Island is located near the southern end of the
Alexander Archipelago in Southeast Alaska. Although the island
covers 136 square miles, the mountainous terrain of the island
limits settlements to the Metlakatla Peninsula, about 24 square
miles in size. The town of Metlakatla is located at the north end
of the Peninsula. Farther south on the peninsula is the
residential area of Annette, and the facilities formerly used by
the U.S. Coast Guard. The closest residential and commercial
center is Ketchikan, located about 20 miles north of Metlakatla,
on Revillagigedo Island.
The studies and projections, presented in this chapter, are
based on a review of previous reports and discussions with
representatives of Federal, State, and local agencies. Valuable
information was obtained from the Metlakatla Indian Community,
Metlakatla" Power and Light, major electricity consumers, fuel
suppliers, and other people involved in the economic development
of the island. In this chapter, a general description of the
historical background of the community and the population is
presented. The major economic activities and their potential
developments are discussed. Total energy consumption is analyzed
as a basis for determining the demand for electricity.
Three scenarios of future electric energy demand are
developed, based on differing socioeconomic assumptions. The most
likely scenario assumes a continuation of present activities and
includes the realization of projects under design and being
planned by the Community. The low scenario reflects a more con-
servative growth, with some planned development delayed. The high
scenario assumes full operation and expansion of the existing
industries, installation of new business ventures, and a commer-
cial development use of the building facilities at Annette air-
port, with an associated increase in the population.
Population
The town of Metlakatla was founded by the Tsimpshean Indians
on March 25, 1887, being led from British Columbia by Father Wil-
liam Duncan. Since then, they have been joined by other Alaskan
Natives including Tlingits, Haidas, Aleuts and also by Caucasians.
In 1891, the U.S. Congress created the Annette Islands Reserve,
which set aside for the exclusive use and occupancy of "Metlakatla
Indians and other Natives of Alaska" the entire Annette Island.
11-1
Today, the population is about 1,100 and is still predominantly
Alaskan Natives with an overall percentage of about 80 percent.
Until 1942, when the u.s. Army established an Air Force base
on the southern end of the Metlakatla Peninsula, there was little
population outside Metlakatla. During the tenure of the base the
population was appreciable, reaching a peak of 750 in 1970. How-
ever, with the decline of military activities and the departure of
the u.s. Coast Guard in 1977, the population outside Metlakatla
was reduced to its present size of about 60 persons.
As shown in Exhibit 1, the number of the island's year-round
residents has fluctuated over the years. The founding of the
Community brought rapid growth and population was recorded at 823
in 1890. During the next 40 years, the population fluctuated
between 400 and 600, reflecting somewhat uneven success in
establishing a stable social and economic base. From 1930 to
1970, however, the population increased steadily with only a small
decline between 1950 and 1960. The population on the island
peaked around 1970 with a total of about 1,800. With the depar-
ture of the u.s. Coast Guard in 1977, and other recent reductions
in Federal Government activities, the present population is about
1,100. Although the population is very young, recent birth rates
were low due to the emigration of young adults in search of better
employment opportunities outside the island. In addition, the
seasonality of employment on the island creates an unemployment
rate which is high, averaging about 30 percent.
Three scenarios of population projections are presented in
Exhibit 1. These growth scenarios (low, most likely, and high)
reflect different assumptions on future economic activities which
are presented in the following paragraphs and the Community's
decisions on immigration. Under the most likely scenario, the
population will increase from 1,100 in 1980 to 1,240 in 1990 and
1,400 in 2000. This scenario corresponds to a continuation of
present population growth rate (an average of 20 births and 8
deaths per year, per 1,000 residents), and economic opportunities
to keep residents employed. The low scenario, with a population
of 1,300 by year 2000, reflects continuation of depressed lumber
markets and no new industries. The high forecast, with a
population of 1,500 by year 2000, assumes rapid development of
forest products and fisheries industries, new small business
ventures, and development of the buildings at Annette airport for
commercial use.
Economy
Fishing and logging are the major income-producing activities
on the island. The Metlakatla Indian Community owns, operates and
leases these income producing enterprises. Other employers are
11-2
also important to Metlakatla's economy. However, the largest one,
the Federal Government, has recently terminated most activities on
the island. Because of the seasonal nature of some activities,
the employment rate falls in winter, and peaks in summer. The
work force varied between 349 and 753 with an average of 511 for
the year 1977. Exhibit 2 summarizes seasonal employment by
activity.
Major Economic Activities
Fisheries. Fishing has long played a vital role in the
culture, subsistence, and income of the Indian Community.
Historically, salmon have been the most important by far of all
fish harvested. Other species, such as herring, halibut, clams,
and crabs are also harvested around Annette Island. Harvesting
employment fluctuates from a low of about 20 in winter to a peak
of 100 in summer.
Another important aspect of the island's fisheries is the
processing activity. Since 1924, the Community-owned Annette
Island Packing Company (AIPC) has operated a cannery. In 1971, a
cold storage facility was added. The packing company is a signi-
ficant employer. As many as 200 persons are employed in the can-
nery during the peak season of July-August. Cold storage oper-
ations are less cyclical and occur mostly during the months of
April through October, with an average of 60 persons employed. In
winter, the work force is reduced to a minimum.
The Metlakatla Indian Community is also engaged in fisheries
resource enhancement with the operation of the new Tamgas Creek
Hatchery. In 1980, about 700,000 juveniles were released. Expan-
sion of the hatchery to incubate about 50 million eggs annually is
planned for 1984.
Forest Products. Logging on the island is by outside
contractors emploYlng mostly non-residents. Consequently, the
timber resources of the island provide a relatively small amount
of employment, but substantial revenues to the Community are
obtained from the timber sale.
Timber processing is the largest employment sector. The
community-owned sawmill, leased to the Louisiana Pacific Corpora-
tion, processes cants for shipment to Japan, and sends chips to
the Ketchikan Pulp Mill. The mill usually operates on two shifts,
year-round. In 1980, it employed an average of 100 persons to
process about 70 million board feet (MMBF) of timber. The supply
comes from Thorne Bay on the east coast of Prince of Wales Island.
In 1981, due to the recession in world markets, the mill shut down
in September, and it processed only 32 MMBF and 28,000 tons of dry
chips. For 1982, it is expected that the mill will start opera-
1I-3
tion in June or July. However, with the recent expansions associ-
ated with the processing of small logs, the mill has the potential
to employ as many as 140 persons and increase its production to
100 MMBF.
Other Activities. Very little activity occurs in other types
of manufacturing. Only a few persons are engaged in Native arts
and crafts, and only from time to time. Construction activities
have kept an average of 15 people employed. Employment in the
transportation sector is associated with the forest products in-
dustry. An average of 50 persons are employed in this sector.
Because of the proximity of the large commercial sector in Ketchi-
kan, employment in trade and services is quite low, averaging 40
jobs. With the departure of the U.S. Coast Guard Air Station,
employment from the Federal Government has dropped dramatically to
about 20 full-time jobs. Nearly all the State of Alaska employ-
ment is associated with the Annette Island School District, with
an average of 30 persons employed. As a result of increased
levels of public services, employment in the local government has
increased rapidly to about 80 jobs.
Future Economic Activities
An estimate of future potential economic activities is pre-
sented to provide a basis for the projections of electric power
and energy demand. This estimate is based on the best available
data and assumptions to insure the economic development of Metla-
katla Indian Community.
Fisheries. The Community is proceeding with several enhance-
ment efforts to'counter the large natural fluctuations in salmon
runs from year to year, and to avoid the swings in seasonal
employment. The fish hatchery, financed by the Bureau of Indian
Affairs, will help restore depleted salmon runs. However, with
the restrictions in federal spending, future development stages
might be cancelled, reduced or delayed. At full development the
Community fishermen should be able to reap harvests ranging
between 400,000 and 700,000 which would increase the current catch
by about 50 percent. The Annette Island Packing Company plans to
increase the cold storage capacity by 50 percent, to start shell
fish processing within the next two years, and is looking into the
possibilities of a more finished product that could be sold
directly to supermarkets.
Forest Products. Due to depressed markets, no sale of round
logs is forecasted for the near future by the Community, and the
sawmill is not expected to reopen until June or July 1982. How-
ever, Annette Island can expect long-term forest products employ-
ment to hold up, although the year-to-year fluctuations will pro-
bably continue. Existing activities at the sawmill will continue
11-4
to increase due to the new equipment that has been recently in-
stalled. Employment could increase as much as 40 percent. Other
activities could include further processing of hemlock and cedar
products to shakes, shingles, lumber for housing construction and
cabinet making. These activities could also lower local housing
construction costs and spur increased construction employment.
Other Activities. In 1982, 24 HUD housing units and several
houses are scheduled to be under construction. In addition, 40
more units are under consideration for the period 1983-1985. The
Community has a swimming pool and a vocational shop under con-
struction. A new boat harbor has been constructed, and docks and
utilities are scheduled for construction in 1982. These facili-
ties will provide the needed installations to increase and main-
tain the fishing fleet. It will also provide jobs for local
natives and may attract off-island sailors.
Tourism is considered as a promising activity for economic
development. However, at the present time, there is a lack of
adequate overnight accommodations and no "tourist package" has yet
been developed. The rebuilding of the Longhouse - a cultural and
craft center -will enhance the Community efforts to revitalize
the Native arts and crafts, and attract visitors.
Opportunities are also available for the establishment of new
business ventures that would offer the needed goods and services
that are presently purchased outside the island. The Community is
also exploring alternatives to redevelop the facilities formerly
used by the U.S. Coast Guard. Possibilities include a foreign
trade zone, an industrial assembly plant, a fish-net manufacturing
plant, and a distribution center for a foreign firm. This project
could be a major new source of income and employment for the
future.
Another potential activity is the mlnlng sector. Previous
surveys of mineral resources reveal a potentially valuable deposit
of barite, and marginal deposits of silver, lead, and zinc. How-
ever, further studies and field explorations will be necessary to
determine the economic viability and environmental ~oncerns.
Energy Sector
Energy Consumption
An energy use inventory was conducted in order to gain an
understanding of the total consumption, and the relative impor-
tance of electricity. Exhibit 3 shows the fuel consumption by
fuel type and end-use for the year 1980. Approximately 500,000
gallons of diesel, 100,000 gallons of fuel oil, and 60,000 gallons
of gasoline were consumed. In addition, an estimated 1,500 tons
II-5
of wood were used for cooking and heating. The electric energy
generated by Purple Lake has a fuel equivalent of about 1,250,000
gallons, which represents 62 percent of the total energy consum?-
tion. The total electric energy consumption accounts for about
three-fourths of the total energy consumption. Therefore, there
is limited potential for transferring other forms of energy con-
sumption to electric energy.
Energy Balance
Exhibit 4 presents the energy balance for 1980. In order to
compare the consumption of different end-uses, the fuels were
reduced to a common denominator, the British thermal unit (Btu).
The total energy consumption was about 155 billion Btu. Due to
conversion losses, and the electric transmission and distribution
losses, the "useful" energy was about 80 billion Btu. Hydroelec-
tric energy from purple Lake provided about 53 percent of this
useful energy.
Electric Power Sector
Existing Systems
The electric utility, Metlakatla Power and Light, operates
two generating plants. The Purple Lake Hydroelectric Plant has
three 1,000 kW generating units. The first two units were instal-
led in 1956, and the third in 1962. The Quarry Plant has two
1,500 kW diesel driven generators. The first unit was installed
in 1967, and the second unit in 1970. The diesel units meet the
large fluctuations of the sawmill operations and supplement the
hydro plant.
In addition, the sawmill has four stand-by diesel units (900,
750, 450 and 350 kW) which are used during repairs or maintenance
at the Quarry Plant. These diesel units have provided only about
5 percent of the sawmill's electricity demand. They are not
interconnected to the island's distribution network.
Monthly Rate Schedule
In April 1979, there was a major increase in electricity
tariff. The monthly residential rate increased from 5.5 cents for
the first 200 kWh to 7 cents, and from 2.8 cents for the next 1300
kWh to 3.7 cents. A similar increase affected the commercial and
industrial sector. In March 1981, the base rate for the first 200
kWh was kept the same at 7 cents, but the rate for the next 1,300
kWh was increased to 4.7 cents, and to 3.5 cents for over 1,500
kWh. For the small commercial sector, the monthly rates are 7
cents for the first 200 kWh, and 5.5 cents over 200 kWh. For the
large commercial sector, the monthly rates are 7 cents for the
II-6
first 5,000 kWh, then 6 cents. For the sawmill, the rate includes
a fuel surcharge, and averages about 15 cents per kWh.
Historical Electric Energy Generation
Historical data on annual energy generation, for the period
1975-1980, are presented in Exhibit 5. In 1980, the total genera-
tion was 17,688 MWh, an increase of 11.4 percent over the 1979
level, but only 1.5 percent over the 1975 level. In 1980, the
hydropower plant generated 14,994 MWh which represents 85 percent
of the total generation. During the period 1975-1980, the
hydropower plant generated an average annual energy of 13,773 MWh.
The annual variation in hydropower generation is related to the
precipitation on the island. For example, in 1978, precipitation
was 20 percent below average, and the energy generated was 8
percent below average. The diesel plant provides the additional
energy requirements. The diesel generation was 2,694 MWh in 1980,
and varied between 1,433 MWh in 1976 and 3,472 MWh in 1977.
Monthly net energy generation for the years 1978, 1979, and
1980 is presented in Exhibit 6. In general, generation require-
ments are about 30 percent greater in winter than in summer. The
peak demand also occurs in winter. In 1980, the peak demand was
4,770 kW. The summer peak was 3,740 kW. The annual load factor
was 42.3 percent in 1980. Monthly load factors are generally
higher during winter months, averaging 50 percent. In 1980, the
summer load factor was about 44 percent.
Historical Electric Energy Consumption
In 1980, the total electric energy consumption sold by Metla-
katla Power and Light was 14.9 million kWh, and the peak demand
was 4,770 kW. Except for the year 1979, when the consumption was
only 12.6 million kWh due to an increase in electricity rates, the
average annual consumption was about 14.6 million kWh for the
period 1975-1980. Four consumer categories were developed from
the data available at Metlakatla Power and Light. These
categories are: residential, public buildings and lighting, small
commercial, and large commercial and industrial. Historical data
on annual energy consumption by consumer categories are presented
in Exhibit 5. Monthly consumption values from January 1980 to
September 1981 are presented in Exhibit 7.
In the residential sector, the number of customers increased
from 303 in 1975 to 350 in 1980. The annual energy consumption
per customer decreased from 21,820 kWh in 1975 to about 18,500 kWh
in 1977 and 19,100 kWh in 1978. Because of an increase of about
30 percent in the cost of electric energy in 1979, consumption
fell to 16,300 kWh per customer. In 1980, residential consumption
returned to earlier use patterns. The average consumption was
II-7
about 18,500 kWh per customer. It must be noted that the residen-
tial consumption is high, due to the use of electric heat. By
comparison, the average residential consumption per customer in
Retchikan was about 8,800 kWh for 1980.
The energy demand for the small commercial sector has been
relatively stable, except for the year 1979. In 1980, the demand
was 1,472 KWh. The large commercial sector consists of the fol-
lowing customers: Leak's Market, FAA Vortac, RCA Alascom, USCG
Hangar, U.S. Weather Bureau, Western Airlines, and GTE Lenkurt
Station. With the departure of the u.S. Coast Guard and reduc-
tions in the other activities, this sector has sharply decreased.
In the industrial sector, there are only two customers:
Annette Hemlock Mills and Annette Island Packing Company. In
1980, the total electric energy consumption was about 4,000 MWh
for the sawmill and 1,000 MWh for the cannery. However, the
demand can fluctuate by as much as 30 percent from year to year.
Future Electric Energy Demand
Three projections of electric energy demand are developed,
based on current use and alternatives in the potential economic
developments. The most likely scenario assumes a continuation of
present activities and includes the realization of projects under
design and being planned by the Community. The low scenario
reflects a more conservative growth, with some planned development
delayed. The high scenario assumes full operation and expansion
of the existing industries, installation of new business ventures,
and development of the buildings at Annette airport for commercial
use.
The forecasts are based on estimated growth in four sectors:
residential, public buildings and lighting, small commercial, and
large commercial and industrial. The annual energy demand is
expected to increase from 15.2 GWh in 1980 to about 23.4 GWh in
2000 under the most likely scenario. The energy demand would be
26.8 GWh under the high scenario and 19.1 GWh under the low sce-
nario. Based on historical data, gross energy generation is
expected to be about 15 percent higher. Exhibit 8 summarizes the
projections. The power market forecast is shown graphically on
Exhibit 9. Detailed descriptions of these projections are pre-
sented in the following paragraphs.
Residential. In 1981, there were 360 customers. This number
will increase to 390 by the end of 1982 as a result of the 24 HUD
units and 6 houses under construction. Although, a total of 40
more HUD units are under consideration for the period 1983-1985,
only an additional 20 customers are expected under the most likely
scenario for the period 1983-1985. An additional 40 customers are
11-8
projected for the high scenario, and 10 for the low scenario. For
the period 1985-2000 an annual increase of 3 customers is project-
ed for the most likely scenario, 2 for the low scenario, and 5 for
the high scenario.
Heating load is a major part of the demand and therefore the
forecast is sensitive to the relative price of wood and electric
heat. Recent trends in the 1981 residential energy consumption
have shown a slight reduction in electric consumption due to the
increasing installation and use of wood stoves. In Metlakatla,
about 75 percent of the houses are equipped with wood stoves.
Based on an average cost of $70 per cord, a weight of 3600 pounds
of wood per cord, a heat content of 4000 Btu per pound, and a wood
stove efficiency of 50 percent; the equivalent cost of electric
heat would be 3.3 cents per kWh. Although the cost of wood for
heating is more attractive,-the supply of wood is now dependent on
the logs found on the near-by beaches. Other factors such as
willingness to pay for a cleaner form of heat, and a stabilized
cost of power are expected to balance the increased demand for
wood. (A detailed economic and financial sensitivity analysis of
residential heating cost on load growth is presented in Chapter V
and VI.) In addition, new housing construction will most likely
be provided with better insulation, efficient wood stoves, and
electric energy-efficient appliances. As a result, the per custo-
mer consumption is expected to decrease slightly. Under the most
likely scenario, the per customer consumption is reduced to 17,000
kWh in 1985 and 16,000 kWh in 2000. For the low scenario, it is
projected to be 16,000 kWh in 1985, and 15,000 kWh for the period
1990-2000. For the high scenario, the annual consumption is kept
constant at 18,000 kWh for the period 1985-2000.
Public Buildings and Lighting. There will be a large in-
crease in thlS sector rn-the next two years, with the addition of
an all-electric indoor swimming pool, a vocational shop, harbor
facilities, and new streets. Discussions with the design company
of the swimming pool indicate a peak demand of 390 kW for heating,
ventilation, and lighting. A load factor of 30 percent and an
annual energy demand of 1,020 MWh are projected for the swimming
pool, under the most likely scenario. The vocational shop will
include a wide variety of power tools, welding machines, woodwork-
ing equipment, and other electric motors. A peak demand of 100
kW, and an annual energy demand of 220 MWh are projected. The new
harbor facilities will include docks, lighting, repair and main-
tenance facilities. An annual energy demand of 100 MWh is projec-
ted. New streets are under construction to provide residential
lots for the HUD housing development program. An additional 20
MWh is expected in 1985 for street lighting. An average annual
growth rate of 1 percent is projected for the energy demand of the
existing facilities. To summarize, an additional energy demand of
II-9
1,404 MWh is projected in this sector for 1985 under the most
likely scenario. With a stable and economic cost of power, it is
also projected that the schools and other public facilities will
progressively shift from oil heating systems to electric heating
in the long term. An average annual growth rate of 2 percent is
projected for the period 1985-2000 under the most likely scenario.
For the high scenario, it is projected that there will be a great-
er use of the existing and new facilities and an average annual
growth rate of 2.5 percent is projected for the period 1985-2000.
For the low scenario, an average annual growth rate of 1 percent
is projected for the period 1985-2000.
Small Commercial. With an improved economy, the trade and
services sector of the island is expected to attract more activi-
ties. For the most likely scenario, an average annual increase of
1 percent is forecasted. For the high scenario, it is assumed
that some of the trade now performed in Ketchikan will be avail-
able on the island. These new small business ventures can be
developed under favorable economic conditions. An average annual
growth rate of 2 percent is forecast. For the low scenario, the
average demand increases 1 percent until 1985. For the period
1985-2000, an average growth rate of 1 percent is also fore-
casted.
Large Commercial and Industrial. In the near future, the
major increase in electric energy demand will corne from the two
existing industries. The cannery is expected to increase its cold
storage capability by about 50% within the next three years and
diversify its production to offer year-round employment. This
will result in an additional electricity demand of about 30 per-
cent by 1985 under the most likely scenario. When the sawmill
reopens and operates under its full capacity, the energy demand
is expected to increase rapidly due to the recent expansions of
the mill. A 40 percent increase is forecasted under the most
likely scenario for 1985. Further processing of hemlock and cedar
products for residential construction are also under considera-
tion, and a progressive development of these activities is pro-
jected. No major changes are expected in the near future for the
other large commercial customers. In the long term, the redevel-
opment of the building facilities at Annette airport could bring a
major increase in the electricity demand. This potential develop-
ment has only been included in the high scenario, under which the
commercial demand in year 2000 is nearly twice the demand of 1980.
Under the most likely scenario, the demand is expected to in-
crease, after 1985, at an average annual growth rate of 2 percent.
The low scenario projects only an average annual growth rate of 1
percent.
II-IO
Future Electric Peak Demand
As shown in Exhibit 5, the total 1980 peak demand was
4,770 kW. The largest load demand is the sawmill which had a peak
of 1,350 kW. With the expansion of the mill, it is expected that
the peak demand at the mill will increase to about 2,000 kW when
the sawmill is in full operation. The other major increase will
come from the indoor swimming pool and the vocational shop. Other
developments such as the fish hatchery, the harbor, and the poten-
tial rehabilitation of the Annette airport facilities will also
have significant loads. No major changes are expected in the
residential and small commercial sector. Annual load factors are
expected to increase slightly from 43 percent in 1980 to 45 per-
cent in 1985, reflecting a greater diversity in electric energy
demand and year-round operations of the industrial sector. After
1985, the annual load factor is expected to remain constant.
These annual load factors are based on gross energy generation.
As a result, the peak demand is expected to increase to about
5,580 kW in 1985 under the most likely scenario, with a low
scenario of 5,040 kW, and a high scenario of 6,100 kW. In year
2000, the peak demand is expected to be about 6,820 kW under the
most likely scenario, 7,820 kW under the high scenario, and 5,560
kW under the low scenario.
II-ll
Chapter III
ALTERNATIVE PROJECTS FOR ELECTRIC GENERATION
In addition to the Chester Lake alternative, presented in the
following chapter, four alternative means of meeting the forecast
of increasing electrical demand on Annette Island have been stud-
ied and are presented in this chapter. The four alternative sour-
ces of power are diesel generation, expansion of the existing
Purple Lake Hydroelectric Project, the Triangle Lake Hydroelectric
Project, and woodwaste generation.
Diesel Generation
The diesel alternative consists of continued use of the two
existing 1.5 MW diesel generators at the Quarry Diesel Plant. For
this study, it was assumed that additional 1.0 MW or 0.5 MW units
would be commissioned in each year that the forecast peak demand
would otherwise exceed the capabilities of the existing generating
facilities and that the existing and future units would be replac-
ed at the end of 20 years of service.
Purple ~ Hydroelectric Project Expansion
Purple Lake presently serves as the reservoir for hydroelec-
tric generating facilities located near sea level on Tamgas Bay to
the west of the lake. The Purple Lake Expansion Alternative was
investigated to determine if the project could be modified to
provide power and energy production. In November, 1981 a recon-
naissance visit to the site was made by a team of engineers,
geologists and an environmental scientist. Three alternative
expansion plans were subsequently developed:
1. Increasing the height of the existing dam to raise the
lake level,
2. constructing a new dam downstream of the existing dam,
which would raise the lake level and also increase the
catchment area of the Purple Lake reservoir by about 0.8
square miles, and
3. Increasing the project's peaking capability by adding a
fourth generating unit at the present powerhouse.
Under Plans land 2, the present lake level would be increased by
no more than five feet. No additional transmission line nor new
access road would be required for any of the expansion plans.
111-1
Environmental Aspects
Terrestrial. Some terrestrial habitat would be inundated by
the higher lake level in Plans 1 and 2. A new dam would cause
greater loss of terrestrial habitat than raising the existing darn,
since a new dam would flood part of the presently unimpounded area
downstream of the existing dam. However, the amount of terrestri-
al habitat lost would not be significant in either case. Plan 3
would have no impact on terrestrial habitat.
Aquatic. Purple Lake is one of the eight lakes on Annette
Island stocked with rainbow trout (Salmo gairdneri) by U.S. Fish
and Wildlife Service (USFWS) between 1973 and 1975. Although
Purple Lake yielded no trout during a subsequent survey, it is
possible that rainbow are present. Two other lakes in the Purple
Lake drainage basin are reported as not supporting any game fish
(USFWS 1976).11
Raising the water surface level of Purple Lake a few feet
would not be expected to have significant adverse effects on the
existing rainbow trout population, if any, nor on other aquatic
organisms. Expansion Plan 3, which does not involve raising the
lake level, would not have any effect on the lake'S aquatic popu-
lation.
Office inspection of USGS topographic maps indicated the
possibility that the Purple Lake system might have a drainage
connection on the eastern end of the basin to Crab Creek, which
flows out of the Dubuque Lakes area and into the head of Crab Bay.
Crab Creek is a catalogued anadromous fish stream (ADFG 1968)11
and is known to support spawning runs of pink, chum, and coho
salmon (Oncorhynchus gorbuscha, o. keta, o. kisutch). Pink salmon
escapement counts in Crab Creek !or-r972-1976 indicate a pink
salmon resource varying between approximately 4,000 and 21,000
fish annually (USFWS 1976). Field investigations in the fall of
1981 revealed that no surface drainage exists between the Purple
Lake system and Crab Creek. There may be some subsurface leakage
through the limestone formation at the eastern end of the basin
which contributes to groundwater in this area. However, raising
the level of Purple Lake and/or placement of a new dam to increase
~/
U.S. Fish and Wildlife Service. 1976. Lake and stream invent-
ory of Annette Island. Draft report provided by USFWS Ketchi-
kan office.
Alaska Dept. of Fish and Game. 1968. Catalog of waters import-
ant for spawning and migration of anadromus fishes. Region 1.
97 pp.
111-2
the catchment area of the Purple Lake reservor would not be ex-
pected to have any effect on fishery resources in Crab Creek.
Special Biotic Resources. Based on the assumption that the
fauna and flora of the Purple Lake area are essentially identical
to those of the Chester Lake area, development of the Purple Lake
alternative would not be expected to have any effect on proposed
or listed threatened or endangered species (see Appendix C).
Although Annette Island supports a large population of resi-
dent northern bald eagles (Haliaetus leucocephalus alascensis),
most eagle nests in SOutheast Alaska are within about 300 feet of
salt water, so that nests would not be expected near Purple Lake.
The Purple Lake expansion alternative would not be expected
to have any adverse effect on estuaries, agricultural land, or
range land. Effect on wetlands, floodplains, and forest land
would be expected to be minimal.
Recreation. Implementation of the Purple Lake expansion
alternative would not be expected to affect present recreation
use.
s~cial Features. No known historical, archeological, or
cultur~ resources would be affected by development of the Purple
Lake alternative.
Raising the existing dam and the level of Purple Lake by a
few feet would change the present scenic/esthetic character of the
area only slightly. Placement of a new dam to raise the lake
level would have greater visual effect than would raising the
existing dam, but for either case only minimal impact would be
expected.
Water Quality and Quantitt . Raising the existing dam or
placing a new dam would probab y cause short-term increases in
turbidity in the east end of Purple Lake, in the stream draining
the lake, and in the two smaller lakes in the eastern end of the
drainage during construction. No significant long-term impacts
would be expected. The Plan 3 alternative is not expected to have
any effect on water quality or quantity at Purple Lake.
Geologic ASpects
A natural damsite exists downstream from the outlet of Purple
Lake, about 4000 feet from the existing dam on Crab Creek. This
location has a relatively narrow rock controlled valley profile,
with a very prominent rock ridge rising to over 500 feet elevation
on the left abutment. River elevation at the proposed site is
about 280 feet.
111-3
The bedrock is report~d to be leuco-trondhjemite of the
Annette Pluton (Berg, 1972) with sound smooth rock slopes on the
reservoir rim. Some 300 feet downstream of the proposed dam axis
is the contact with foliated intrusive rocks (diorite), and 3000
feet downstream is the contact with recrystallized limestone rocks
which appear to drain and underlie the eastern outlet of Sink
Lake.
During the reconnaissance fly-over it was noted that there is
a very thin cover of overburden in the river valley and on the
right abutment, and that there are stable smooth rock outcrops
forming both abutments.
See Geologic map of Annette Island, Alaska USGS (Henry C.
Berg, 1972).
Hydrologic Aspects
Prior to the construction of the Purple Lake dam, the U.S.
Geological Survey collected stream flow records for a period of
nine water years from OCtober 1947 through September 1956.
According to these records, presented in Table III-I, the
average annual runoff to Purple Lake during the 9 year period was
179.6 inches over the total 6.8 square mile drainage area upstream
of the gaging station.
Precipitation records at the nearby Annette airport are avai-
lable for 39 consecutive years starting February 1941. Monthly
values of these records are given in Table 111-2.
These records are used to derive average monthly ratios be-
tween runoff at Purple Lake and precipitation at Annette airport.
The U.S.G.S. records at Purple Lake are converted into equivalent
inches of runoff over the 6.8 square miles drainage area, and are
presented in Table 1II-3 with the corresponding precipitation
records of Annette airport. Average monthly ratios are computed
by dividing the total monthly runoff at Purple Lake by the total
monthly precipitation records for the period 1948-1956. These
ratios are then used to derive monthly runoff for the Purple Lake
Reservoir for the periods October 1941 -September 1947 and
OCtober 1956 -September 1980, using the precipitation records
at Annette airport, and a drainage area of 6.52 square miles at
Purple Lake Dam. The U.S.G.S. stream flow records at Purple Lake
gage for the period October 1947 -September 1956 were adjusted
for the smaller drainage area at the Purple Lake Dam by the ratio
of 6.52 divided by 6.8. The results are presented in Table 111-
4.
111-4
Table 111-1
STREAM FLOW AT PURPLE LAKE GAGE -U.S.G.S RECORDS
Acre-Feet
Water-Year OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL
1947-1948 10,440 4,960 1,110 8,800 3,220 3,870 2,060 3,110 2,530 1,720 2,080 8,640 60,260
1948-1949 10,150 10,310 5,400 6,810 1,430 4,120 11,150 5,640 5,500 3,690 5,890 7,010 77,220
1949-1950 11,810 8,460 3,050 3,490 3,210 4,280 4,760 5,050 3,470 5,520 5,520 1,840 66,520
1950-1951 4,920 4,410 7,110 5,020 3,320 3,950 3,100 4,990 6,060 1,120 1,630 2,050 47,740
1951-1952 5,750 4,460 4,610 4,300 5,180 4,000 5,950 4,610 3,590 2,460 2,710 6,550 54,2]0
1952-1953 6,410 5,760 4,940 ],150 7,650 6,570 5,310 1,100 1,190 2,880 1,300 6,800 59,720
1953-1954 12,290 10,980 10,410 3,840 11,190 2,790 4,560 6,060 5,630 3,090 714 3,290 74,900
1954-1955 • 1,420 12,310 14,200 1,910 6,920 3,170 6,590 6,120 4,200 1,280 6,720 4,710 85,610
1955-1956 12,960 4,680 3,]20 1,390 3,270 1,710 6,260 7,360 6,210 2,920 6,910 ] ,090 60,080
Drainaqe area of Purple Lake gaqe • 6.8 square miles
Table 111-2
PRECIPITATION AT ANNETTE AIRPORT
Year JAN fEB MAR APR HAY JUNE JULY AUG SEPT OCT NOV DF.C ANNUAL
1941 2.95 9.66 5. J4 4.01 6.41 4.61 1.66 6.61 14.98 11.25 6.90
1942 8.20 ].04 9.39 1.85 ].91 1.0] 1.12 3.29 4.]2 16.11 12.14 9.85 RO.91
1943 9.26 11.69 2.29 6.94 1.22 2.05 8.16 6.41 1.51 9.8] 14.91 12.88 99.93
1944 11.66 4.94 11. J1 1.26 8.18 ].]2 4.42 5.84 1.91 19.83 11.0] 8.5] 104.95
1945 11.12 1.8] 11. 26 1.56 1. 61 1.19 6.95 0.62 9.15 12.92 1.00 1.40 91.21
1946 8.]6 10.52 13.01 8.91 1.34 4.02 8.61 4.11 12.]9 10.8] 9.61 11.29 103.18
1941 11.14 6.66 1.]2 8.14 ].61 4.88 5.9] 1.6] 9.09 20.13 1.54 14. ]5 106.42
1948 14.22 6.6] 4.64 1.23 2.25 5.10 ].12 5.60 16.9] 19.10 12.09 1.91 99.42
1949 9.98 6.45 1.19 21. ]5 4.98 9.14 1.02 6.50 11.51 20.38 13.54 5.]6 124.66
1950 0.11 9.]2 1.]5 1.99 8.15 2.19 10.11 10.16 10.28 9.51 6.02 11.21 93.62
1951 8.56 1.13 10.45 6.91 4.66 4.91 2.68 4.88 5.64 9.44 8.56 6.90 80.84
1952 10.15 1. ]] 9.64 8.00 ].26 4.14 2.91 6.21 13.62 8.9] 8.52 6.16 89.53
195] 5.]0 12.21 10.26 5.19 10.36 2.21 ]. J1 ].90 11.99 lB.06 15.80 16.22 115.59
1954 1.41 13.88 5.83 1.99 5.00 6.39 4.01 0.71 5.]0 lB. 43 16.18 20.19 Ill. 38
1955 1. ]] 11.11 11.42 10.51 11.18 8. J1 2.56 16.58 11.99 ll.98 12.12 4.38 150.28 .
1956 5.49 10.19 9.60 13.80 10.92 10.40 5.28 11.16 5.15 20.65 21.45 18.13 149.42
1951 ].15 8.ll 6.90 10.48 5.89 6.91 1.18 6.05 1.51 9.84 23.65 11.81 114.40
1958 20.69 9.18 ].25 9.]1 11.64 1.15 ].98 20.12 15.13 34.81 21.04 11.55 169.11
1959 12.18 9.95 2].51 11.09 8.81 6. JJ 10.85 10.51 14.60 24.96 28.09 28.90 189.90
1960 18.29 11.4] 2].51 14.08 5.02 5.69 9.06 ].51 10. J1 21.6] 8.01 13.49 144.15
1961 9.69 1].81 9.12 1.41 ].40 5.18 2.88 1.50 5.82 22.82 15.46 14.82 118.51
1962 19.26 0.13 6.08 12.19 2. ]] 1.64 2.98 8.20 10.50 15.12 15.28 15.15 116.06
1963 8.15 16.52 4.21 6.84 3.61 8.34 5.60 0.19 lfi.96 19.44 10.50 14.65 115.61
1964 4.94 13.22 11.06 8.11 4.96 ].82 6.2] 10.49 9.16 8.62 9.81 9.81 120.89
1965 15.46 lB.06 ].00 9.81 8.24 4.94 3.14 ].91 2.52 21.15 11.41 13.12 121.68
1966 11.19 11.12 1.13 ].22 14.68 2.2] 2.11 4.81 9.40 11.90 6.11 9.45 110.61
1961 9.25 15.32 ].01 2.33 1.91 2.98 8.18 10.25 15.51 11.90 6.02 12.11 11. 43
196R 11.05 5.80 10.4] 13.63 1.51 4.13 4.81 6.42 15.19 18.81 14.09 4.81 110.80
1969 ].]9 3.40 ].50 10.68 4.56 2.8] 6.09 11.25 4.90 9.56 24.89 16.25 101.30
1910 1.16 8.03 1.8] 8.11 11.21 5.50 5.16 1.88 11.82 15.29 ].61 6.82 99.62
1911 1.59 10.10 9.49 9.96 4.24 3.61 0.56 8.56 1.]0 14.04 13.64 8.]] 98.03
1912 8.20 8.41 10.54 8.18 5.18 4.95 4.]6 9.90 4.18 13.46 10.11 9.43 98.10
1913 9.18 9.66 8.83 8.85 9.50 5.96 5.46 4.61 12.81 15.19 5.37 10.6] 101.31
1914 6.42 11.91 ].01 8.02 1.10 5.19 ].10 2.54 1.46 22.49 16.05 15.95 109.90
1915 11.]0 1.51 4.4] 1.95 3.92 5.56 4.94 6.51 9.93 8.82 9.20 14.28 95.01
1916 16.01 9.94 11.92 8.19 9.18 4.44 6.61 1.56 13.15 11.40 10.02 15.49 125.11
1971 5.88 16.50 1.46 1.ll ].08 6.46 4.15 2.01 5.66 15. Jl 11.68 5.94 91. 44
1918 J. 01 6.10 1.61 5.84 ].92 0.95 1. 98 6.00 11. 66 15.95 14. ]9 11.35 88.82
1979 6.51 1.01 9.69 2.24 9.81 6.86 2.44 1.11 12.42 10.35 10.20 12.34 92.41
1980 4.89 8.14 9.12 16.88 4.55 0.81 6.12 6.56 8.09 18.35 11. J1 14.11 116.19
Record
H('all 9.85 9.52 8.91 8.18 6.25 4.81 5.08 6.92 9.92 11.09 12.63 12.20 112.02
Table 111-]
ANNETTE PRECIPITATION VS. PURPLE LAKE PRECIPITATION RUNOFF
(inches)
Annette/
Water-Year
pur~; Lake
NOV DEC JAN FED MAR APR MAY JUN JUL AUG SEP TOTAL
1947-1948 20.13 7.54 14.35 14.22 6.6] 4.64 1. 23 2.25 5.10 3.12 5.60 16.93 101. 74
28.79 13.68 19.77 24.26 8.88 10.67 5.68 10.40 6.98 4.74 5.74 23.82 163.41
1948-1949 19.70 12.09 7.91 9.98 6.45 7.79 21. 35 4.98 9.74 7.02 6.50 11.57 125.08
27.99 28.59 14.89 18.94 3.94 11. 36 30.74 15.55 15.17 10.17 16.24 19. JJ 212.91
1949-1950 20.38 13.54 5.36 0.77 9.32 7.25 7.99 8.15 2.79 10.17 10.16 10.28 106.16
32.7J 23.33 8.41 9.62 8.85 11.80 13.12 13.92 9.57 15.22 15.22 21.62 183.41
1950-1951 9.51 6.02 11.21 8.56 7.n 10.45 6.97 4.66 4.97 2.68 4.88 5.64 82.68
13.57 12.16 19.77 13.84 9.15 10.89 8.55 13.76 16.71 3.09 4.49 5.65 131. 63
1951-1952 9.44 8.56 6.90 10.15 7. )) 9.64 8.00 3.26 4.14 2.91 6.27 13.62 90.22
15.85 12.30 12.71 11.86 14.28 11.03 16.41 12.71 9.90 6.78 7.64 18.06 149.53
1952-1953 8.93 8.52 6.76 5.30 12.27 10.26 5.79 10.36 2.27 3.37 ].90 11.99 89.72
17.84 15.88 13.62 8.69 21.09 18.12 14.64 21.23 3.28 7.94 3.58 18.75 164.66
1953-1954 18.06 15.80 16.22 7.41 13.88 5.83 7.99 5.00 6.39 4.07 0.71 5.30 106.66
JJ.89 30.28 28.87 10.59 30.85 7.69 12.57 16.71 15.52 8.52 1.97 9.07 206.53
1954-1955 18.43 16.18 20.19 17. )) 11.17 11.4] 10.51 11.78 8.37 2.56 16.58 11.99 156.52
]1.49 34.11 39.15 21.81 19.08 8.74 18.17 16.88 11.58 3.53 18.53 12.99 236.06
1955-1956 ]1.98 12.12 4.38 5.49 10.19 9.60 13.80 10.92 10.40 5.28 17.76 5.75 137.67
35.74 12.90 9.15 3.83 9.02 4.72 17.26 20.29 17.12 8.05 19.05 8.52 165.65
Precipitation
54.17 41.18 72.36 93.07 Annette 156.56 100.]7 93.28 79.21 84.37 76.89 83.63 61. 36 996.45
Purple Lake 217.89 183.23 166. J4 123.44 125.14 95.02 137.14 141.45 105.83 68.04 92.46 ll7.81 16ll.79
Ratjo 1.519 1.826 1. 783 1.558 1.483 1. 2]6 1.640 2.]05 1.954 1.652 1.278 1.481 1. 619
Table 111-4 Sheet 1 of 2
INFLOW TO PURPLE LAKE RESERVOIR
Acre-Feet
Water-Year OCT NOV DEC JAN FEB MAR APR MAY JUNE JULY AUG SEPT TOTAL
1942 7610 7088 4336 4069 1488 4297 5418 3832 756 1017 1658 2228 43857
43 8184 7649 6189 4595 5123 1041 4843 6969 1506 5178 3260 3904 59047
44 4994 9432 8093 5786 2419 5203 5067 8475 24J8 2613 2943 4110 61573
45 10074 6950 5360 5518 3814 5153 5216 1612 5721 4108 312 4719 58637
46 6564 4410 4650 4148 5151 5981 6218 1293 2952 5125 2101 6389 54982
41 5502 6055 7094 5528 3261 3350 5681 3485 ]584 ]505 ]844 4688 55577
48 10012 4757 6816 84]9 ]088 3711 1976 . ]615 2426 1649 1995 8286 56830
49 9734 9945 5179 6588 1171 3951 1069] 5409 5214 ]539 5649 672] 74055
50 11]8] 811] 2925 3341 ]078 4105 4565 4843 3328 5294 5294 7519 63794
51 4118 4229 6816 4814 1I84 3781 2973 4185 5812 1074 156] 1966 45781
52 5514 4277 4421 4124 4968 ]8]6 5106 4421 344] 2359 2656 6281 52006
53 6205 5524 4737 ]021 73]6 6]01 5092 7384 1141 2762 1247 6521 57271
54 11186 105]0 10041 ]68] 10131 2616 4]73 5812 5]99 296] 685 3155 71834
55 10952 1186] 13618 7586 6636 ]0]9 6]20 5869 4028 1228 6444 4517 82100
56 12429 4488 3184 Ill] 1I]6 1640 600] 1058 5955 2800 6627 2963 57616
51 10491 13515 11]92 1861 4069 1I58 7314 5686 5119 4244 ]048 ]873 73770
58 4999 14902 11229 10267 4188 1487 6491 112]6 845 235] 10440 7802 86845
59 11715 13257 11028 6044 4872 10186 7140 8504 4649 6414 5326 7529 103864
60 12681 11699 18159 15120 5596 10186 9826 4846 4179 5]56 1769 5348 111365
61 10989 5041 8416 4808 6161 4448 5111 3282 ]804 1702 3779 ]001 61268
62 11593 9141 9112 9557 ]57 2182 8501 2249 5611 1762 4132 5415 11018
Table 111-4 Sheet 2 of 2
INFLOW TO PURPLE LAKE RESERVOIR
Acre-Feet
W::ter-Year OCT NOV DEC JAN FEB MAR APR MAY JUNE JULY AUG SEPT TOTAL
196] 7681 9628 9896 4044 8088 1926 4714 ]54] 6125 ]]10 ]98 8146 68159
64 9876 6616 9205 1413 6473 5061 5660 4788 2805 ]68] 5285 50]] 71898
65 9460 6219 6164 7671 8842 1:>73 6888 7954 ]628 1974 1970 1300 6]44]
66 1379] 7227 8621 555] 5738 7b]9 2247 14171 16]8 16]7 2424 4847 75735
67 9094 ]888 59]8 4590 7501 1377 1626 769] 2189 5190 5165 7998 62249
68 9094 ]79] 7609 548] 2840 4773 9512 1516 ]0]] 284] ]2]5 78]] 61564
69 9556 8878 ]060 1682 1665 1602 7454 4402 2078 ]600 5669 2527 52173
70 .. 857 1568] 10211 ]851 ]932 ]58] 5660 10821 40]9 ]405 ]970 6095 76107
71 7768 2275 4285 3766 5239 434] 6951 409] 2651 ]31 4318 ]764 49784
72 71]] 8594 5234 4069 4118 482] 6128 5000 ]6]5 2577 4988 2465 58764
11 68]8 6370 5925 485] 4730 4040 6176 9170 4]77 ]228 2]5] 6606 64666
14 8022 ]]84 6679 3186 5811 1406 5597 74]] ]812 18]] 1280 ]847 52310
75 11426 1011] 10022 5607 ]677 2027 5548 ]784 408] 2920 ]310 5121 676]8
76 4481 5797 9]50 8242 4867 5454 6114 9441 ]261 ]907 ]809 6781 71524
77 5792 611] 973] 2918 8078 3414 5102 2973 4144 245] 1013 2919 55452
78 7778 7359 ]732 1494 2987 ]510 4076 ]784 698 1052 ]02] 6013 45506
79 810] 9067 7132 ]2]0 ]515 44]5 156] 9470 50]8 1442 1396 6405 60796
80 5258 6427 1754 2426 ]985 4448 11780 4]92 595 ]972 ]]05 4172 58514
TOTAL 340139 ]07102 29]725 200314 18195] 156958 228195 225091 136]99 116402 111681 199409 2519372
AVEHAGE 8722 7814 7511 5136 4717 4025 5851 5772 . ]497 2985 ]]76 5111 64599
Drainage area 6.52 square miles.
Based on the resulting estimated monthly inflows, the average
annual inflow to purple Lake is 89.2 cfs. If total utilization of
the available water resource could be achieved, the total average
energy that could be generated would be about 16,090,000 kWh per
year.
The actual average gross generation for the years 1975
through 1980 was 13,773,600 kWh and during this period the average
precipitation at Annette airport was 101.63 inches. The 1975
through 1980 precipitation is about 91 percent of the long term
average precipitation of 112.02 inches. The potential generation
for 1975 through 1980 is estimated to be about 14,640,000 kWh per
year. The possible generation is about 6.3 percent above the
actual generation for the period.
Expansion Plan!: Raising Purple Lake Dam
The existing Purple Lake dam and spillway weir could be rais-
ed to provide additional storage in the reservoir. As noted, in
the previous discussion of Purple Lake hydrology, nearly all the
run off in the catchment is being utilized for generation. Rais-
ing the dam would provide an estimated additional 520,000 kWh of
energy annually but would not provide any new peaking capacity.
Expansion Plan 2: Constructing ~ New Purple Lake Dam
About 0.9 miles downstream from the existing Purple Lake darn
is a potential damsite which, if utilized, would increase the
existing drainage area to 7.36 square miles or about a 13% in-
crease. Runoff from the increased drainage area would increase
the average annual potential energy to about 18,160,000 kWh, an
increase of 2,100,000 kWh. A dam at this location would increase
the lake area from 838 acres to about 892 acres. Its height would
be about 100 feet and its length about 600 feet as scaled from the
USGS map of 1:63360 Ketchikan (A-5) Alaska Quadrangle. Such a dam
would cost approximately $10,000,000. It can be seen that this
would not be an economically justifable alternative to Chester
Lake since far less energy and no additional capacity would be
produced.
Expansion Plan 1: Adding ~ Fourth Unit At Purple Lake
The Purple Lake Project could be expanded by the addition of
a fourth unit at the existing powerhouse. For this study, the
addition of a 1.0 MW unit was investigated. Such an expansion
would require tapping the existing water conduit at the trifurca-
tion just upstream of the powerhouse and installing a new section
of 30-inch diameter penstock. A fourth unit bay would be con-
structed adjacent to the existing south end wall of the power-
111-5
house. The existing end wall would be removed and the powerhouse
extended to enclose the new unit. The new unit would be a hori-
zontal Francis type turbine-generating unit similar to the
existing units. The cost of the expansion is estimated to be
$2,600,000 at the January 1982 price level. (See Exhibit 10).
The expansion would add an estimated average 300,000 kWh of energy
generation to system annually.
Conclusions
As described above, Plan 1 expansion of the Purple Lake proj-
ect by raising the existing dam and reservoir would increase the
potential average annual energy output of the project by only
about 520,000 kWh but would add no capacity to the existing
system. Expansion of the project by constructing a new dam down-
stream of the existing structure to increase the drainage area of
the impoundment would yield an estimated average annual additional
2,100,000 kWh, but at a cost that appears to be prohibitive at
this time. Neither of these plans of expansion is a viable
alternative to the recommended plan of development.
Expansion of Purple Lake Project by addition of a fourth unit
would increase the project's peaking capability by 1.0 MW and its
average annual energy output by an estimated 300,000 kWh. Of the
three expansion plans investigated it has the least potential for
adversely impacting the environment. While the expanison provides
too little benefit to be considered an alternative to the Chester
Lake Project it was given further consideration as a part of a
combined development with the 1.5 MW Chester Lake run of river
alternative. Further discussion of this expansion plan and an
economic comparision between the combined development and two
alternative developments of Chester Lake are presented in Chapter
IV and V.
Triangle ~ Hydroelectric Project
Another hydro power alternative investigated is the Triangle
Lake Project. Triangle Lake, (also referred to as Spine Lake or
Hassler Lake in some literature), lies in northeastern Annette
Island about two miles inland from Revillagigedo Channel. The
lake was identified as a potential hydro power resource in the
1977 Definite Report on Chester Lake. The present study included
a site reconnaissance, performed in November 1981, by a team of
engineers, geologists and an environmental scientist.
Project Description
The Triangle Lake Project would develop the hydroelectric
potential between the lake and the sea at Hassler Harbor, see
Exhibit 11 sheet 1. The lake level would be raised 10 feet from
111-6
El. 383 to El. 393 by construction of a rockfill dam across the
natural outlet of the lake. The maximum gross head developed
would be about 370 feet. The project's installed capacity would
be 3.0 MW and its average annual energy generation is estimated to
be 11,000,000 kWh.
Geology
The proposed damsite would be located at the outlet of
Triangle Lake and above a rapids and waterfalls section with a 180
feet drop. A low rockfill dam would be suitable for this site to
develop the head from the falls.
The proposed dam axis has bedrock exposed in the river chan-
nel near the top of the rapids section, and there are overburden
ridges of sand, gravel and boulders of glacial debris on both
abutments. Bedrock at the site has a northwesterly foliation
trend, and is reported to be trondhjemite, igneous rock of the
Annette Pluton (Berg, 1972). The rock-controlled falls delineate
the northern limit of the resistant igneous rock at the contact
with the younger and weaker slates, and phyllitic greywackes
(Jurassic age). Investigation would be req~ired to locate con-
struction materials.
The proposed northeasterly penstock route to the powerhouse
at Hassler Harbor is over hummocky ground with thin overburden
overlying leucotrondjemite and local greenstone schist and finally
greywacke and limestones near the coast (USGS Geologic Map of
Annette Island, Berg, 1972).
Dam
The dam would be a rockfill structure with a reinforced con-
crete membrane on its upstream face, as shown on Exhibit 11 sheet
2. The dam's maximum height would be 30 feet, with crest at
El. 400, and its crest length would be about 350 feet. An ungated
concrete ogee spillway would be provided in the central portion of
the dam. The spillway crest would be 60 feet long allowing
passage of 4,300 cfs without overtopping the rockfill dam.
Power Conduit
Water for power generation would be conducted to the power-
house via a reinforced concrete intake and steel penstock. The
intake would be constructed on the northeast bay of Triangle Lake.
The intake would be provided with a trashrack and a bulkhead for
closure of the intake. The penstock would be about one mile long
and 54 inches in diameter. The penstock route would be generally
northeast towards Hassler Harbor through heavily forested terrain.
To minimize clearing requirements the penstock would be placed on
111-7
bedd ing in a shallow tr ...: .. ch throughout its leng th and covered wi th
backfill material. Reinforced concrete anchor blocks would be
provided at major bends. A cross section through the intake and a
typical section through the buried steel penstock are shown on
Exhibit 11 sheets 3 and 4 respectively.
Powerhouse
The powerhouse would be located on the shoreline of Hassler
Harbor. The powerhouse would have a reinforced concrete substruc-
ture and a steel superstruct~re with a fabricated metal skin. The
powerhouse is shown on Exhibit 11 sheets 5,6, and 7.
Generating Equipment
The generating unit would be a horizontal Francis type tur-
bine and 3,000 kW generator. The unit would be capable of remote
operation from the Purple Lake Hydro Project.
Switchyard ~ Transmission
The generator would be connected to a step-up transformer
located in a small yard adjacent to the powerhouse. A single
circuit 34.5 kV transmission line, 12 miles long, would connect
the project to the Metlakatla Power and Light distribution system
at Walden Point Road. The recommended transmission line route
would follow the required project access road along the penstock
to the dam. From there the transmission line would continue one
mile northeast to intercept an existing logging road. The line
would follow the logging road southwest to Port Chester and south
along the shoreline to Walden Point Road. While this routing is
not the most direct available, it has the advantage of following
existing or required roads as much as possible, thereby reducing
clearing requirements and facilitating construction and mainten-
ance of the line.
Reservoir
The reservoir created by the dam will enlarge the present
Triangle Lake. By raising the lake level 10 feet to El. 393, the
reservoir area would be increased to about 510 acres. The live
storage created would be an estimated 4,700 acre-feet. Clearing
of the heavily forested shoreline of the lake will be required to
reduce blockage of the intake by floating debris during project
operation.
Costs
A reconnaissance level cost estimate was prepared for the
Triangle Lake Project. Dimensions and elevations were based on
III-8
the 1:63360 USGS Ketchikan (A-5) Quadrangle map. The estimate
includes the direct costs of civil works, contractor's overhead
and profit, purchase and installation of equipment, contingencies,
engineering and owner's administration. The estimate is at
January 1982 price levels and excludes price escalation beyond
that date. Interest during construction is also excluded. Unit
prices for the various civil works items are adapted from those
used in the Chester Lake estimates where applicable. Costs for
electrical equipment were based on recent data provided by manu-
facturers and adjusted to January 1982 price levels. As shown on
Table 111-5 the estimated cost of the Triangle Lake Project is
$22.7 million including a contingency allowance of 20 percent and
estimated engineering and owner's overhead costs of $3.0 million.
1.
2.
3.
4.
5.
6.
7.
Table 111-5
Triangle Lake Project
Cost Estimate
Mobilization
Access Road and Dock
Reservoir, Dam, Spillway
Penstock
Powerhouse
Mechancial & Electrical
Transmission Line
Subtotal
Contingency 20% +
Total Direct Cost
& Intake
Equipment
Engineering & Administration 15%+
Total Construction Cost
(January 1982 Price Level)
Environmental ASpects
$ 700,000
3,100,000
2,850,000
5,000,000
1,000,000
2,500,000
1,250,000
$16,400,000
3,300,000
$19,700,000
3,000,000
$22,700,000
Terrestrial. Raising the lake level would inundate some
terrestrial habitat, but the amount of habitat flooded would not
be significant since the slopes abutting Triangle Lake are quite
steep.
There is an existing logging road leading from near the out-
let of Trout Lake to the general vicinity of Triangle Lake which
could serve as part of the access road and transmission line route
between Triangle Lake and Metlakatla. Some new roads would be re-
111-9
quired in the immediate vicinity of Triangle Lake, and between
Trout Lake and Metlakatla. Disturbance of some terrestrial habi-
tat would occur with new road construction.
Aquatic. Triangle Lake is known to support a population of
cutthroat trout (Salmo clarki), while the small lake in the upper
drainage to the southwest apparently has no game fish (USFWS
1976). The small lake downstream of Triangle Lake is known to
support both cutthroat trout and Dolly Varden char (Salvelinus
malma). The stream draining Triangle Lake is not catalogued as an
anadromous fish stream (ADFG 1968). Fall 1981 field observations
confirmed the presence of a high waterfall impassable to fish
where the stream enters tidewater. In addition, intertidal salmon
spawning habitat at the mouth of the stream appears to be minimal.
Since cutthroat trout usually spawn in small streams in
gravel substrate (Scott and Crossman 1973)11, raising the lake
level would probably inundate spawning habitat in the lake's tri-
butary streams. The potential magnitude of this impact cannot be
ascertained at present, since there are no data on the lake's
cutthroat population.
Since Dolly Varden and cutthroat trout occur in the small
lake in the lower drainage below Triangle Lake (USFWS 1976), both
these species are almost certainly present in the stream in the
lower part of the drainage as well. With a hydropower project at
Triangle Lake, adequate minimum releases from the lake would prob-
ably be necessary to ensure maintenance of the downstream fishery
resources.
While it is not a part of the development plan presented,
consideration was given to constructing an overflow spillway on
the eastern arm of the lake which would discharge into Cascade
Creek, the next drainage basin to the east. If such a spillway
were to be included as part of this alternative, effects of spill
on the Cascade Creek flow regime would have to be examined, since
this stream is an AOFG-catalogued anadromous fish stream (ADFG
1968). Cascade Creek supports spawning runs of both pink and chum
salmon, with a maximum annual pink salmon escapement of about
2,000 fish estimated during the period 1972-1976 (USFWS 1976).
Care would have to be exercised in routing and placement of
new accss road and transmission line to avoid adverse effects on
aquatic habitat. Use of existing roads for project access and
transmission line routing would be preferable wherever possible.
Scott, W.B., and E.J. Crossman. 1973. Freshwater fishes of
Canada Fisheries Research Board of Canada Bulletin 184,
Ottawa, 966 pp.
III-IO
Probably the most sensiti~~ area along the potential transmission
line route is where the line would cross the streams draining the
Trout Lake and Melanson Lake systems, just north of Chester Lake.
Both the Trout and Melanson Lake outlets are catalogued anadromous
fish streams (ADFG 1968). The Trout Lake system supports popula-
tions of pink, chum, coho, and sockeye salmon (Oncorhynchus
nerka), cutthroat trout, and Dolly Varden char. The Melanson Lake
system provides provides spawning habitat for pink and chum salmon
in the outlet stream downstream of the 125 foot falls near tide-
water, and supports cutthroat and rainbow trout in the upper
drainage (USFWS 1976). Placement of a tranmission line and/or
access road through this area would have to be carried out care-
fully in order to avoid distrubance of the important fish habitat
in these streams.
Special Biotic Resources. Based on the assumption that the
flora and fauna of the Triangle Lake area are essentially ident-
ical to those of the Chester Lake area, development of the Trian-
gle Lake alternative would not be expected to have any effect on
proposed or listed threatened or endangered species (see Appendix
C) •
Construction of new access road and transmission line place-
ment in areas near tidewater could impinge upon eagle use areas.
The rights-of-way would have to be routed and construction sche-
duled to avoid any disturbance of eagles during the nesting and
brooding season.
The Triangle Lake alternative would not be expected to have
any adverse effect on agricultural land or range land. Provided
the existing logging road is used to the extent possible for pro-
ject access and transmission line routing, effects on forest land
would be expected to be minimal and not significant. Likewise,
effects of the Triangle Lake alternative on wetlands, floodplains,
and estuaries would be expected to be minimal.
Recreation. Implementation of the Triangle Lake alternative
would lmprove access to the lake area and would probably lead to
increased recreational use, including hunting and fishing.
s~cial Features. No known historical, archeological, or
cultur~ resources would be affected by development of the Trian-
gle Lake alternative. However, in the event this alternative is
carried further, a preconstruction archeological survey should be
conducted, with emphasis on those areas near the coastline of the
island which would be affected.
Impact on existing scenic/esthetic conditions would result
from raising the water level of Triangle Lake, modification of the
flow regime of the discharge stream, and placement of the dam,
III-II
penstock, powerhouse, access road, and transmission line. In each
case, impact could be minimized by using proper design and/or
routing criteria.
Water Quality and Quantity. There would probably be short-
term increases in suspended sediment levels in Triangle Lake and
its outlet stream during construction. With proper construction
procedures, no significant adverse impact would result.
Terrestrial vegetation which would be inundated by raising
the Triangle Lake water level should be cleared to avoid any po-
tential debris problems at the power intake or spillway. Signifi-
cant water quality changes would be expected in Triangle Lake if
clearing were not carried out.
WOod waste Generation
The community-owned sawmill, leased to the Louisana Pacific
Corporation, processes cants for shipment to Japan and sends chips
to the Ketchikan Pulp Mill in Ketchikan. In 1981, due to the
recession in world markets, the mill shut down in September, and
processed only 32 million board feet (MMBF) of timber and 28,000
tons of chips. For 1982, it is expected that the mill will start
operation in June or July.
Discussions with representatives of the Louisiana Pacific
Corporation have indicated that the sawdust associated with the
processing of timber is presently sent to Ketchikan where it is
used for electric generation. Several tests have also been per-
formed to use the bark, but the project was not found technically
feasible. As a result, the Louisiana Pacific Corporation has no
present intention of developing its own wood-waste generating
plant in Metlakatla. In addition, no other Alaska mill makes a
common practice of burning large volumes of pulp chips for fuel.
In 1981, the dockside price of a 2400-lb. unit have ranged
between $43 and $117. Assuming an adjusted price of $64 per 2400-
lb. unit, and about five pounds of wood chips to generate 1 kWh,
the fuel value would be about 13.3 ~/kWh. This compares to a
diesel fuel cost of about 13 ~/kWh for the market area. In
addition, the investments and maintenance costs of a wood-waste
generating plant are higher than the costs of a diesel plant. For
these reasons, a wood-waste alternative was not found economically
attractive to meet the energy demand of the market area.
III-12
Chapter IV
THE CHESTER LAKE ALTERNATIVE
General Project Description
The Chester Lake Project would develop the hydroelectric
potential between Chester Lake and Port Chester. The project
would consist of a new dam and spillway, constructed downstream
of the present water supply dam: a water conductor, consisting
of a gated intake and steel surface penstock: a sea level con-
crete powerhouse, containing a single horizontal Francis type
turbine-generator unit: and a step-up transformer and transmis-
sion line link to the existing transmission system. The project
would be capable of operation by remote control from the Purple
Lake Hydro project. A detailed description is given in
Chapter VII.
Alternative Plans of Development
Three alternative plans of development of the Chester Lake
resource were investigated. The plans are presented in this
chapter and the results of economic and financial comparisons of
the plans are given in subsequent chapters. The three alterna-
tive development plans are:
Alternative 1. This alternative is a storage project with
a 2.5 MW installed capacity. An 80 foot (maximum height)
concrete arch-gravity dam would be constructed downstream
of the existing water supply dam. An ungated spillway with
its crest at El. 885, 40 feet above existing lake level,
would be located in the center of the dam. The resulting
reservoir would have a useable storage capacity of 4180
acre feet. The remaining project features conform to the
general description previously given.
Alternative 2. This alternative is a 2.5 MW run of river
project. The dam would be a concrete arch-gravity with its
spillway crest and maximum normal pool at El. 845. The dam
would be designed to allow a future raise to El. 885. The
remaining project features are the same as those of Alter-
native 1.
Alternative 3. This alternative consists of a 1.5 MW run
of river proJect at Chester Lake and a 1.0 MW addition to
the existing Purple Lake Project (described in Chapter
III). The new Chester Lake dam would be the same as that
contemplated for Alternative 2. The penstock, powerhouse
IV-l
and equipment would be sized for the 1.5 MW generating
unit.
Data pertaining to each of the alternatives are shown
in Table IV-I.
Item
Installed
Capacity, MW
Maximum
Normal
Pool, El.
Useable
Storage,
Acre-feet
Total
Construc-
tion cost-
Million $
Alterna-
tive 1
Chester
Lake
2.5
885
4,180
13.1
Table IV-l
Alterna-
tive 2
Chester
Lake
2.5
845
None
9.1
Alternative 3
Chester Purple
Lake Lake
1.5 1.0
845 321
None 25,000
8.2 -2.6
Cost estimates were prepared for each of the alternatives
considered. The estimates are at the January 1982 price level
and include the direct cost of civil works, contractor's over-
head and profit, purchase and installation of equipment, contin-
gencies, engineering, and owner's administration. Interest
during construction and price escalation beyond January 1982 are
not included. The estimated cost of each project is shown in
detail on Exhibits 12 through 14.
The difficult access for construction of the Chester Lake
Project is reflected in the cost items No. 2 and No.6 on Exhi-
bits 12, 13, and 14. For Alternative 1, with reservoir at
El. 885, access for construction of the dam and a portion of the
penstock will be provided by a cableway from sea level, near the
powerhouse site, to El. 840 at the dam site. the estimated cost
of construction and operation of the cableway is Item No. 2 on
Exhibit 12. The smaller quantities of materials required for
construction of the El. 845 dam for Alternatives 2 and 3 make
helicopter access to the dam and penstock area less expensive
IV-2
than cableway access. The estimated cost of transporting mate-
rials and equipment by helicopter for construction of the
El. 845 dam and penstock is shown as Item No.2 on Exhibits 13
and 14.
Item No. 6 on Exhibits 12, 13 and 14 is the estimated cost
of access to the powerhouse area both during and after construc-
tion. For Alternatives 2 and 3, access to the powerhouse area
for powerhouse construction and equipment installation would be
required for approximately one year. By contrast, access to the
powerhouse area for Alternative 1 would be required during the
entire two year construction period. This is necessary because,
in addition to powerhouse construction access requirements,
materials and equipment for construction of the El. 885 dam and
penstock must also be taken to the powerhouse site for transfer
to the cableway.
Permanent access to the powerhouse for all of the Chester
Lake alternatives would be provided by a wooden walkway con-
structed approximately parallel to the shore of Port Chester
from Walden Point Road. The cost of the walkway is included in
item No. 6 on Exhibits 12 through 14.
Power and Energy Potential of Alternative Projects
Reservoir and system power operation studies were made to
determine the power and energy that could be produced at the
Purple Lake Project, the expanded Purple Lake Project and at
each alternative of the proposed Chester Lake Project. The
energy utilization from the existing and expanded Purple Lake
Project, proposed Chester Lake Project and 3000-kW Quarry Diesel
Plant by the Metlakatla System were estimated for the planning
period.
The operation studies were performed for the Chester Lake
Project with maximum normal reservoir levels at elevation 885,
and 845 and with installed capacities of 2,500 kW and 1,500 kW.
The expansion of the existing Purple Lake Project with addition
of a 1000-kW unit was also studied. The combinations are:
Alternative 1
Chester Lake.-Maximum normal reservoir level at El. 885
and installation of 2,500 kW.
Purple Lake -Existing installation of 3,000 kW.
IV-3
Alternative 2
Chester Lake -Maximum normal reservoir level at El. 845
and installation of 2,500 kW.
Purple Lake -Existing installation of 3,000 kW.
Alternative 3
Chester Lake -Maximum normal reservoir level at El. 845
and installation of 1,500 kW.
Purple Lake -Expansion of the existing 3000-kW plant
with addition of a 1000-kW unit.
Streamflow
The monthly streamflows at Chester Lake for the period of
1942 to 1980 were developed from the 9-year record of monthly
flows from Purple Lake. The development of the estir;.ated month-
ly streamflows from Purple Lake is discussed in Chapter III.
The Chester Lake average monthly streamflows,'shown in Table IV-
2, are Purple Lake flows adjusted for drainage area ratio. The
average annual runoff is estimated to be 16,050 acre-feet.
Table IV-2
AVERAGE MONTHLY STREAMFLOWS AT CHESTER LAKE
Month
January
February
March
April
May
June
July
August
September
October
November
December
Average
Total
IV-4
Streamflow, c fs
2 0.8
21.1
16.3
24.4
23.3
14.6
12.1
13.6
21.3
35.2
32.9
30.4
22.2
16,050 Acre-feet
Monthly Peak Loads and E:1ergy Demands
The monthly peak loads and net energy generation for the
years 1978, 1979 and 1980 were used to develop the load and
energy demand patterns. The monthly peak loads expressed in
terms of percentage of the annual peak load and the monthly
energy demands in percentage of the annual energy generation
requirement are given in Table IV-3. The monthly loads and
energy demands were used in the reservoir operation studies.
The loads and energy demands were also used to develop the
annual load duration and peak-percentage curves as shown on
Exhibit 15. The curves were used for dispatching the Purple
Lake and Chester Lake hydroelectric plants and the Quarry Diesel
Plant. The dispatching of the plants in the Metlakatla System
is discussed later in this report.
Month
January
February
March
April
May
June
July
August
September
October
November
December
Table IV-3
MONTHLY PEAK LOADS AND
ENERGY DEMANDS
Peak Load In
Percent of
Annual Peak
91.8
84.1
84.5
80.5
77.1
70.3
75.8
79.3
71.0
78.4
83.3
100.0
Reservoir Operation and Power Studies
Energy Demand In
Percent of
Annual Generation
9.71
9.37
8.65
7.74
8.32
7.19
7.75
7.67
7.13
7.30
9.26
9.91
100.00
The operation of the Purple Lake and the proposed Chester
Lake Projects were simulated to determine the potential power
and energy production of the Purple Lake and Chester Lake
Hydroelectric powerplants. The operation was conducted on a
monthly basis using the simulated streamflow data. The basic
assumptions and required input data are as follows:
Basic Assumptions. The basic assumptions used for the
operatlon studies were:
IV-5
1. The reservoir is ":ull at the start of the operation
studies.
2. The maximum normal reservoir water surface is the
elevation of the top of the spillway crest.
3. The assumed annual energy generation requirements were
distributed to each month on the basis of the forecast
demand pattern.
Input Data. The input data included:
1. Area-capacity curve.
2. Tailwater elevation.
3. Monthly streamflows for the period of 1942-1980.
4. Turbine performance curve.
5. Maximum and minimum reservoir operating levels.
6. Monthly non-power release requirement, 1 cfs from
Chester Lake for water supply to Metlakatla.
7. Monthly energy demand pattern.
Results of the Reservoir Operation Studies
The average and firm energies for alternative schemes of
the Chester Lake development and Purple Lake expansion are
summarized in Table IV-4.
IV-6 ,
Table IV-4
AVERAGE AND FIRM ENERGY POTENTIAL OF
THE CHESTER LAKE AND PURPLE LAKE POWERPLANTS
Al t.
No.
1
2
3
Al t.
No.
1,2
3
Chester Lake
Project
El. 885,
Capacity
2,500 kW
El. 845,
Capacity
2,500 kW
El. 845,
Capacity
1,500 kW
Purple Lake
Project
Existing
Installation
3,000 kW
With
Expansion
4,000 kW
Average Annual
Energy
Million kWh
10.3
9.8
8.6
15.8
16.1
Firm Annual
Energy
Million kWh
7.9
6.6
6.3
13.8
13.8
The lowest annual energy potential computed in the opera-
tion studies of the Purple Lake and Chester Lake Projects using
39 years of simulated monthly streamflows (1942-80) were used as
the firm energy production of the projects.
Energy Utilization of the System
Upon completion of determining the potential energy produc-
tion, the energy generation from the existing and expanded
Purple Lake and proposed Chester Lake Hydroelectric Projects and
Quarry Diesel Plant were fitted under the annual load duration
curve.
The energy generation from the existing Purple Lake Project
was combined with the proposed Chester Lake Project to maximize
the hydro generation under the load duration curve. When the
IV-7
total dependable capacity of the hydroelectric plants was less
than the peak load demand, the Quarry Diesel Plant was placed on
peak to meet the load. The monthly diesel energy generation was
determined by subtracting the amount of hydro energy utilized
from the forecast energy requirements of the Metlakatla System,
or peaking energy production corresponding to the dispatched
capacity of the Quarry Diesel Plant under the load duration
curve.
The procedure was carried out for each month for the three
selected wet, average and critical years. Two load years, 1985
and 2000, were used to evaluate the effect of the load growth on
the energy utilization from the hydroelectric plants in the
system. The average annual energy utilization from the Purple
Lake and Chester Lake Projects and the Quarry Diesel Plant were
estimated on the basis of the results of the load dispatch study
for the three selected years and frequency distribution of the
annual energy generation using the 39 years of the simulated
monthly streamflows. The average annual energy utilization from
the hydroelectric and diesel plants for load years 1985 and 2000
with the Chester Lake maximum normal reservoir level at eleva-
tion 845 and installation of 2500 kW are given in Table IV-5.
IV-8
Table IV-5
ENERGY UTILIZATION OF THE
HYDROELECTRIC AND DIESEL PLANTS
Load Purple Chester
Alternative Year Demandll Lake Lake Diesel
GWh GWh GWh GWh
Base CaseY 1985 22.01 15.0 7.01
2000 26.88 15.0 11.88
Alternative 1
Chester L. E1. 885 1985 22.01 15.0 7.0 0.01
Inst. Cap. 2.5 MW 2000 26.88 15.0 9.6 2.28
Al ternative 2
Chester L. E1. 845 1985 22.01 15.0 6.4 0.61
Inst. Cap. 2.5 MW 2000 26.88 15.0 8.3 3.58
Al ternative 3
Chester L. E1. 845 1985 22.01 15.3 6.3 0.41
Inst. Cap. 1.5 MW 2000 26.88 15.3 8.0 3.58
II Most likely scenario
~I Base Case, no Chester Lake Project
IV-9
Chapter V
ECONOMIC EVALUATION
Introduction
A description of three alternative plans of development of
the Chester Lake resource are presented in the previous chapter.
In this chapter an economic comparison of the three alternatives
is presented and, based on that comparison, one of the alternative
is selected for further analysis.
In Chapter III, a description is presented of other alterna-
tive sources of power available on Annette Island. From these
alternatives, and the selected Chester Lake alternative, three
expansion plans were developed according to the guidelines of the
Alaska Power Authority (APA). An economic comparison of the three
expansion plans is presented in this chapter.
The "Base Case" expansion plan would meet the forecasted
requirements of the area by a continuation of present practices of
diesel generation to supplement the Purple Lake Project. The
"Preferred Plan" would consist of the addition of the Chester Lake
Hydro Project to the present system. The "Second Most Preferred
Plan" would consist of the addition of the Triangle Lake Hydro
Project instead of Chester Lake.
An investigation of alternative heating technologies was
conducted and an economic comparison of the various heating modes
was prepared. The results of those studies are presented in the
final section of this chapter.
Criteria for Economic Comparisons
The Alaska Power Authority (APA) has established the follow-
ing standard parameters for the economic evaluation. A discount
rate of 3 percent is used to calculate the present worth of costs
occuring in different years on an equivalent basis. The cost of
diesel oil is assumed to escalate at a rate of 2.6 percent for the
next twenty years and is then constant. The escalation rate for
non-fuel cost items is assumed to be zero. The economic life is
assumed to be 50 years for hydropower plants and 20 years for the
diesel units.
The economic analysis is for the period starting in 1982 and
ending in 2034, the last year of the 50-year economic life of the
Chester Lake Project. The analysis assumes replacement of the
existing generating facilities at the end of each facility's eco-
nomic life: 1991 for the two 1.5 MW diesel units and 2011 for the
V-I
three 1.0 MW hydropower units at Purple Lake. New generating
facilities would be added in the year that the peak demand would
otherwise exceed the system's firm capacity, excluding the largest
generating unit. However, it was assumed that in case of an out-
age of a generating unit power deliveries to the sawmill can be
reduced by 1000 kW, because the sawmill has in reserve, for emer-
gency use, four standby diesel units which have total capacity of
2,450 kW.
Separate economic analyses were prepared for the three
different electric load forecasts for each of the alternative
plans. The energy required was assumed to be supplied by the
plants in the following sequence:
1. Purple Lake
2. Chester Lake (or Triangle Lake)
3. Diesel Units
The energy generated by the hydro plants was obtained from
the results of the reservoir operation studies previously
described. Deficiencies between the demand and the supply from
the hydro plants will be up by the diesel plant. When total
installed capacity at the hydro plants is less than peak demand,
peaking energy will be provided by the diesel plant. Energy
values listed in Table IV-S were used in the economic analyses.
Fixed costs of hydro projects, i.e., construction costs,
engineering, owner's overhead, interest during construction and
amortization expenses at 3 percent interest were spread over a
50 year amortization period. For diesel plants, a 20 year amori-
zation period was used.
Annual operation and maintenance costs for the Chester Lake
project were based on remote control operation. Annual operation
and maintenance costs for the diesel plant were estimated at $0.03
per kWh generated. No escalation was applied to these annual
costs.
Cost of the diesel fuel was estimated at $0.09 per kWh of
energy generated at the plant based on an average generation of
12 kWh per gallon. An annual differentia1 escalation rate of 2.6
percent was applied to the cost of diesel fuel until year 2001.
No increase in fuel cost was assumed to occur thereafter.
The annual totals of the future costs were discounted at
3 percent rate to present worth year 1982.
Economic Comparison of Chester Lake Alternatives
Using the established criteria, an economic comparison was
performed to determine the best alternative development of Chester
V-2
Lake. The results of the study are presented in Table V 1 and on
Exhibit 16 pages 1 through 9. As shown in the table, Alternative
1, the storage project, with reservoir El. 885 and 2.5 MW
installed capacity has the least present worth cost for the most
likely and high scenarios of load growth. For the low load fore-
cast, Alternative 2, the 2.5 MW run of river project has the least
present worth. Based on these results, the 2.5 MW storage project
with reservoir El. 885 is the selected project for further com-
parison with other alternative power sources on Annette Island.
Load
Forecast
Most
Likely
Low
High
Table V-I
ECONOMIC COMPARISON OF ALTERNATIVE PLANS OF
DEVELOPMENT AT CHESTER LAKE
Plan
No.
1
2
3
1
2
3
1
2
3
Chester
Reservoir
Elevation
ft
885
845
845
885
845
845
885
845
845
Lake
Installed
Capacity
MW
2.5
2.5
1.5Y
2.5
2.5
1.5Y
2.5
2.5
1.5Y
Cumulative
Present Worth
in $ Millionll
30.95
31.33
32.95
24.25
21.15
22.14
44.42
45.53
47.15
17 Present worth of Chester Lake, Purple Lake and Diesel Plants.
~/ Installed capacity at Purple Lake increased to 4 MW.
Economic Comparison of Alternative System Expansion Plans
General
As noted in Chapter II, the existing Metlakatla Power and
Light generating facilities consist of the three-unit, 3.0 MW
Purple Lake Hydroelectric Project and two 1.5 MW diesel genera-
tors: a total of system installed capacity of 6.0 MW. Based on
the largest-unit-out criterion, the system firm capacity is
presently 4.5 MW. In developing the various expansion plans it is
assumed that at the outage of the largest unit, peaking power from
the Metlakatla system to the sawmill will be reduced by 1000 kW
because the sawmill has in reserve, for emergency use, four
V-3
standby diesel units which total 2,450 kW. In the evaluation of
the various alternative expansion plans, the existing facilities
are common components of each plan. In accordance with the
economic criteria under which the economic evaluation is
performed, the generating facilities at Purple Lake are assumed to
require replacement or major overhaul at the end of 50 years
service, or in the year 2011. The cost of such replacement is
estimated to be about $3.0 million. Similarly the existing and
future diesel units would be replaced after about 20 years of
service. The replacement of the existing diesel units is assumed
to occur in 1991.
used in the The fixed costs of the existing facilities,
economic analysis, are based on historical data.
cost of the Purple Lake Project is $85,000. For
diesel unit the annual fixed cost is $30,000.
The annual fixed
each 1.5 MW
Base Case Plan
The Base Case is a continuation of present practices, using
the Purple Lake Project for base-load generation and diesel units
for production of peaking power. New diesel units will have a
service life of 20 years, and will be added when necessary to
maintain a reserve margin equal to the capacity of the largest
generating unit in the system less 1000 kW power delivery to the
sawmill. Each new diesel unit can be installed within a few
months before its capacity is required.
Table V-2 shows the Base Case system expansion schedule
each of the electric load forecasts developed in Chapter II.
table gives the unit size, type, and on-line year for each
required replacement or addition to the system.
for
The
Based on recent quotations received for similar units and
including the cost of transportation, erection, contingencies and
engineering, the cost of diesel units, installed in the project
area, is estimated to be about $750 per kilowatt, at January 1982
price level. Based on average plant energy generation of about
12 kWh per gallon of diesel fuel, the fuel cost is equal to $0.09
per kilowatt-hour for 1982. The operation and maintenance costs
are estimated at $0.03 per kilowatt-hour.
Preferred Plan
The Preferred Plan would consist of the construction of the
Chester Lake 2.5 MW storage project followed by additional diesel
units, when required. The existing diesel units would serve as
standby units. The Chester Lake Project is expected to start
operating January 1985.
V-4
Table V-3 gives the Preferred Plan system expansion schedules
required to meet the low, high and most likely electric load
forecasts.
The detailed construction costs of the Chester Lake Project
are presented in Exhibit 12. The total cost is estimated at
$13,140,000. The annual operation and maintenance cost for the
project is estimated to be $65,000. The installed capacity at
Chester Lake is 2,500 kW. The maximum annual energy utilized by
the system is 9,600 KWh.
Second Most Preferred Plan
The Second Most Preferred Plan would consist of the construc-
tion of the Triangle Lake Project, followed by additional diesel
units, if required. The Triangle Lake Project would start opera-
tion in 1986. The construction and annual operation and mainten-
ance costs of the Triangle Lake Project are estimated to be
$22,700,000 and $130,000 respectively. A higher operation and
maintenance cost is estimated for Triangle Lake than for Chester
Lake because Triangle Lake is much more remote and has a much
longer transmission line. The installed capacity is 3,000 kW, and
the average annual energy is 11,000 MWh.
System expansion schedules for the Second Most Preferred Plan
for each of the three electric load growth scenarios are shown on
Table V-4.
Economic Comparison
Using the established criteria, an economic comparison was
performed to determine the most favorable plan of system expan-
sion. The present worth cost of the Base Case, Preferred Plan and
Second Most Preferred Plan were computed for each of the load
growth forecasts. Pages 1 through 9 of Exhibit 17 show the eco-
nomic analysis and present worth computations for each of the
three expanison plans and for each of the three electric load
forecasts.
The present worths (-costs) of the alternative plans,
expressed in $ million, are as follows:
V-5
Table V-5
Most Likely ww High
Plan of Load Load Load
Develo~ent Forecast Forecast Forecast
Base Case 54.34 35.74 66.19
Preferred Plan 30.95 24.25 44.42
Second Preferred Plan 37.18 33.45 49.95
As shown above, the Preferred Plan will have the lowest cost
for meeting the energy and capacity requirements of any of the
load forecasts.
Analysis of Alternative Residential Heating Technologies
To evaluate the impact of the addition of the Chester Lake
Project on the existing residential heating mode split, and to
judge the assumptions made in the load forecasts, economic and
financial analyses of alternate methods of meeting heating
requirements were performed. For the purpose of the economic
analysis, the Chester Lake Alternative 2 (Run-of-River and 2.5 MW)
was chosen to derive the electricity production cost in 1985 and
thereafter under the most likely scenario of energy demand. To
reflect the existing differences between residential electric
rates and commercial/industrial rates, the "residential"
production cost is expected to be 75 percent of the average cost.
Although there would be a major cost increase in 1991 due to
replacement of the existing diesel units, this increase is not
incorporated in our analysis because it would affect mostly the
commercial/industrial customers.
A description of the predominant residential heating modes in
use on Annette Island and the economic analysis thereof are pre-
sented in the following paragraphs. The financial analysis of
residential heating is presented in Chapter VI.
Alternative Space ~ Water Heating
On Annette Island, space and water heating are now mostly
provided by electric resistance. In addition, nearly all the
houses are using wood stoves for supplemental space heating. The
estimated average annual heating requirement for a residential
unit with 950 square feet of living area was about 64 million Btu
for space heating, and 17 million Btu for water heating. In 1981,
electric energy provided about 58 percent of the total demand,
wood 32 percent, and fuel oil 10 percent.
V-6
Investment and maintenance costs of four alternative methods
of meeting heating requirements were derived from a study spon-
sored by the Alaska Power Administration for Juneau. These costs
are presented in Table V-6. The annual investment costs are based
on a 10% discount rate and a 10-year economic life. For the wood
alternative, two investment and maintenance costs are presented,
corresponding to the installation of a wood stove or of a complete
wood-heating system. For the heat pump alternative, a coefficient
of operating performance of 2.2 is used.
Although the wood alternative has the least total cost, its
inconvenience and time-consuming operation has made it only a
supplemental energy source. In addition, if there is a greater
demand for wood, the price is expected to increase faster than
inflation because the supply of wood from the nearby beaches is
limited. The logs would then have to come from the forests which
are farther from the community and not as accessible as the
beaches. For comparison, the costs of wood heating with $70, $90
and $120 per cord are presented in Table V-6. At $120 per cord,
an "all wood" alternative is more expensive than an "all electric"
alternative.
Based on the current residential price of SO.OS/kWh, the
electric resistance alternative is slightly less expensive than
the heat pump alternative. With higher electricty prices, a heat
pump becomes more attractive. But, because the existing houses
already have electric space heaters, and because the investment
cost of a heat pump is very high, it is expected that the
potential market for heat pumps would be limited to the new units
under construction. However, the HUD units under construction or
planned by the Housing Authority of Metlakatla will be equipped
with wood stoves and electric resistance heating. As a result, a
reduction in electric consumption due to the installation of heat
pumps is not expected in the short and mid term.
The fuel oil alternative is the most expensive. With a total
annual cost of $1880, it is about 13% higher than an all electric
alternative, and 36% higher than an all wood alternative.
Economic Analysis. Projections of the average residential
heating energy cost were performed to evaluate the impact of the
Chester Lake addition on the residential electric consumption. An
economic analysis was performed based on APA parameters (0%
inflation and 2.6% fuel escalation rate). The results are
summarized in Table V-7 and presented graphically on Exhibit 18.
The cost of electricity was derived from the production cost and
the distribution cost. Based on 1981 data, the "residential"
net production cost was about SO.02/kWh. When the Chester Lake
powerp1ant starts operating in 1985, there will be an increase in
the production costs. The production costs are then derived from
V-7
Exhibit 16, Page 2 of 9 corresponding to the Chester Lake
Alternative 2. The residential distribution costs averaged about
SO.03/kWh in 1981. The distribution costs were kept constant for
the economic analysis.
Table V-7
AVERAGE ANNUAL RESIDENTIAL HEATING ENERGY COST
Economic Ana1;LSis 1981 1985 1990 1995
Electrical Resistance:
(23,700 kWh) $1,185 $1,430 $1,400 $1,400
Fuel Oil: (980 gallons) $1,130 $1,250 $1,420 $1,620
Wood: ( 9 cords)
S 70 per cord $ 630 $ 630 $ 630 $ 630
$120 per cord $1,080 $1,080 $1,080 $1,080
V-8
Table V-6
Annual Total AnnualY Annual Total
Energy!! Energy Energy Invest-Invest-Mainten-Annual
Re9uired Cost Cost ment Cost ment Cost ance Cost Cost
Electric
Resistance 23,700 kWh $0.05/kWh 1,185 2,750 450 25 1,660
Fuel Oil 980 gal $1.15 gal 1,130 4,000 650 100 1,880
Wood 9 cords $ 70/cord 630 800/4,000 130/650 20/100 780/1,380
$ 90/cord 810 960/1,560
$120/cord 1,080 1,230/1,830
Heat Pump 10, 800 kWh $0.05/kWh 540 6,570 1,070 100 1,710
(COP=2.2)
!/ Based on an annual heating requirement of 81 x 10 6 Btu for an average residential housing
unit.
~/ Based on 10% discount rate and 10-year economic life.
Chapter VI
FINANCIAL ANALYSIS-COST OF ENERGY
Financial Plans
Four alternative plans of financing the Chester Lake
Project were used to estimate the future production costs of the
total Metlakatla Power and Light system and of the Chester Lake
Project alone. These plans of financing represent some, but not
necessarily all, of the various alternatives available to
finance the Chester Lake Project, and were used to derive the
cost of electric energy under the most likely and low scenarios
of energy demand and the average annual hydro generation. The
four alternative plans are as follows:
Financin1 Alternative I
The tota cost is flnanced by 12% revenue bonds for a 35-
year term.
Financing Alternative II
A 5% state loan for a ~-year term.
Financing Alternative III
A state grant with a 5~ate of return which includes the
O&M costs. No interest during construction.
Financing Alternative IV
A combination of REA sponsored financing consisting of a 5%
loan for $5.48 million and a 13% loan for the balance of
the total required funds.
The diesel fixed annual costs for new additions or replacements
are based on APA parameters: 10% discount rate and a 20-year
life. In addition, insurance costs are added to the annual
fixed costs. For Chester Lake, the annual insurance cost is
equal to 0.1% of the investment costs. For Diesel units, it is
equal to 0.25% of the investment costs.
Criteria for Financial Analysis
The cost of energy analysis is based on the following para-
meters:
o a 7% general inflation rate~
o a 2.6% fuel escalation rate above the general infla-
tion rate for the period 1982-200l~
VI-l
o a fuel energy cost of $0.09/kWh at January 1, 1982
price level; and
o a diesel investment cost of $750/kW at January 1, 1982
price level.
Cost of Energy
The results of the cost of energy (financial) analysis are
shown in graphical form, on Exhibits 19 through 22. Each page
(1 through 4) shows the cost of energy over the twenty year
study period for a different financing plan. Each exhibit pre-
sents the results for a different combination of load forecast
scenario (low or mostly likely) and energy source (Chester Lake
only or total system generation), as follows:
Exhibit 19 -Most Likely/Total System
Exhibit 20 -Low/Total System
Exhibit 21 -Most Likely/Chester Lake Only
Exhibit 22 -Low/Chester Lake Only
Appended Exhibits B-19 through B-22 present corresponding
computational backup to the graphical presentation. Page 1 of
each exhibit in Appendix B is the computation of energy costs
for the Base Case. Pages 2 through 13 of the Appendix B exhib-
its show the cost of energy calculations for the various system
expansion plans and for each financing alternative.
Sensitivity Analysis of Residential
Heating Cost ~ Load Growth
A description of residential heating modes used on Annette
Island and an economic comparison of the various alternatives
are given in Chapter V. This section presents the cost of ener-
gy analysis of the heating alternatives and a discussion of the
sensitivity of load growth to the cost of energy.
Analysis of Residential Heating,Costs
Appended exhibits B-19 and B-20 show the expected total
production cost of energy from the Metlakatla Power and Light
System for various alternative system expansion plans, financing
alternatives, and load growth scenarios for the period 1982
through 2005. Data from sheets 6, 7, 8 and 9 of the exhibits,
pertaining to the Chester Lake 2.5 MW run of river project, was
used to develop the projected cost of electric resistivity heat-
ing for comparison to other residential heating alternatives.
To reflect the existing differences between residential and
commercial/industrial rates, the "residential" production cost
is expected to be 75 percent of the average cost. Although
VI-2
there would be a major increase in 1991 due to the replacement
of the existing diesel units, this increase is not incoporated
in this analysis because it would affect mostly the commerical/-
industrial customers. Estimated total annual residential elec-
tric heating costs were computed for the period 1985 through
1995 based on annual consumption of 23700 kWh per customer.
Metlakatla Power and Light's residential distribution costs
averaged about $0.03/kWh in 1981. These distribution costs are
based on salaries, administrative costs, and other distribution
costs which are relatively constant. To reflect that composi-
tion, the distribution cost was increased by an annual rate of 5
percent over the period 1981-1995 for this analysis.
For the most likely load forecast, the net production cost
(distribution costs excluded) is expected to increase from
$0.02/kWh to an average of $0.076/kWh for the period of 1985-
1995 under the 12% Revenue Bonds alternative, $0.048/kWh with a
5% loan, $0.039/kWh with 5% rate of return financing, and
$0.063/kWh with combined rate funds.
Exhibit 20 shows that under the low load forecast, the
expected production costs for the period 1985-1995 are
$0.083/kWh with 12% financing, $0.05l/kWh with a 5% loan,
$0.04l/kWh 5% rate of return financing, and $0.067/kWh with
combined rate funding.
Table VI-l an VI-2 show the results of the financial analy-
sis of residential heating under the most likely load growth
scenario and under the low load growth scenario respectively.
The results are shown in graphical form on Exhibits 23 and 24,
respectively.
Load Growth Sensitivity to Energy Cost
The cost ratio of all residential electric heating to all
residential wood heating is also presented in Tables VI-l and
VI-2. Based on the earlier description of the 1981 heating mode
split, there would be financial incentives to use more wood, in
order to keep the same "heating budget", when the cost ratio
increases from its 1981 level. Under the most likely scenario,
and based on $70 per cord, this would happen under a 12% Revenue
Bonds financing alternative and also under a combined rate loan.
With a 5% loan, the cost ratio is only higher for the years
1985-1989. Then, as the ratio decreases from its 1981 level,
there would be no financial incentives to shift from electricity
to wood. With 5% rate of return funding the cost ratio is
higher for 1985 and then decreases. If the cost of wood
increase to $120 per cord (1981 price level), the ratio of elec-
tric to wood heating decreases in all cases. As a result, no
VI-3
Table VI-l
AVERAGE ANNUAL RESIDENTIAL HEATING ENERGY COST
MOSTLY LIKELY LOAD GROWTH
Electric Resistence: (23,700 kWh)
12% Revenue Bonds
5% Loan
5% Rate of Return
5%/13% Combined Rate
1981
$1,185
$1,185
$1,185
$1,185
1985
$2,660
$2,000
$1,790
$2,360
1990
$2,900
$2,240
$2,030
$2,600
1995
$3,210
$2,550
$2,330
$2,900
Fuel Oil: (980 gallons)1I
Wood: (9 cords)lI
$1,130 $1,620 $2,580 $4,080
$ 70 per cord
$120 per cord
$ 630 $ 830 $1,160 $1,620
$ $1,420 $1,980 $2,780
Ratio: Electric Resistance/Wood
12% Revenue Bonds and $70 per
cord
12% Revenue Bonds and $120
per cord
5% Loan and $70 per cord
5% Loan and $120 per cord
5% Rate of Return and $70 per
cord
5% Rate of Return and $120
per cord
5%/13% Combined Rate Funding and
$70 per cord
5%/13% Combined Rate Funding and
$120 per cord
1.9 3.2
1.9
1.9 2.4
1.4
1.9 2.1
1.3
1.9 2.8
1.7
1/ 7% inflation rate + 2.6% fuel escalation rate
~/ 7% inflation rate
2.5
1.5
1.9
1.1
1.7
1.0
1.3
2.0
1.1
1.6
0.9
1.4
0.8
1.8
1.0
Table VI-2
AVERAGE ANNUAL RESIDENTIAL HEATING ENERGY COST
LOW LOAD GROWTH
E1ec tr ic Res istence: (23,700 kWh)
12% Revenue Bonds
5% Loan
5% Rate of Return
5%/13% Combined Rate
1981
$1,185
$1,185
$1,185
$1,185
1985
$ 2,830
$2,070
$1,840
$2,450
1990
$3,070
$2,310
$2,070
$2,690
1995
$3,370
$2,620
$2,380
$3,000
Fuel Oil: (980 ga11ons)1I
Wood: (9 cords)li
$1,130 $1,620 $2,580 $4,080
$ 70 per cord
$120 per cord
$ 630 $ 830 $1,160 $1,620
$ $1,420 $1,980 $2,780
Ratio: Electric Resistance/Wood
12% Revenue Bonds and $70 per
cord
12% Revenue Bonds and $120
per cord
5% Loan and $70 per cord
5% Loan and $120 per cord
5% Rate of Return and $70 per
cord
5% Rate of Return and $120
per cord
5%/13% Combined Rate Funding and
$70 per cord
5%/13% Combined Rate Funding and
$120 per cord
1.9 3.4
2.0
1.9 2.5
1.5
1.9
1.3
1.9 2.9
1.7
17 7% inflation rate + 2.6 fuel escalation rate 1/ 7% inflation rate
2.6
1.6
2.0
1.2
1.8
1.0
2.3
1.3
2.1
1.2
1.6
0.9
1.5
0.9
1.8
1.1
major change would be expected in the residential electric
consumption.
Under the most likely scenario of load forecast, the aver-
age annual electric consumption per residential customer is
projected to decrease from 18,500 kWh in 1980 to 17,000 kWh in
1985, and 16,000 kWh in 2000. This estimated reduction is based
on a continuation of recent trends of greater use of wood to
replace fuel oil and some electric heating consumption, and on
conservation and insulation efforts to reduce overall energy
demand. Under this scenario, the cost of electricity is also
expected to remain as competitive as it is now. This is depen-
dent on favorable financing, such as a 5% loan, for future
electric generation projects.
As mentioned earlier, the average space heating requirement
is about 64 million Btu for a typical housing unit with a living
area of 950 square feet. With about 7050 Heating Degree Days
per year in Annette Island, this energy consumption corresponds
to 0.40 Btu/sqft/oF/hour. This demand could be reduced by as
much as 30 percent with insulation and conservation.
Under the low scenario, the annual residential consumption
was further reduced to 15,000 kWh to reflect higher cost of
electricity due to the Chester Lake Project, and greater conser-
vation efforts to maintain total residential heating costs at a
reasonable level. Under this low scenario, a competitive
Chester Lake Project with favorable financing was also assumed.
If no favorable financing scheme can be obtained, the cost of
electricity will increase. For example, if 12% Revenue Bonds
are used instead of a 5% loan, the cost of electricity from
Chester Lake would nearly double. Such an alternative would
result in a greater reduction of electric energy consumption in
the short term. However, in the long term, the cost of elec-
tricity from Chester Lake will increase at a lower rate than
inflation because the annual investment costs, which are the
major annual cost of a hydropower project, do not increase with
inflation, while the cost of other energy sources, such as wood
and fuel oil, will continue to increase with or faster than
inflation.
VI-4
Chapter VII
RECOMMENDED PROJECT
Project Location and Setting
The Chester Lake Project is located at latitude 55°07' N, and
longitude 131°33' W, near the community of Metlakatla on Annette
Island in Southeast Alaska as shown on Exhibit 25. The project
will develop the head between Chester Lake and the sea at Port
Chester. The lake discharges into Waterfall Creek which flows
into Port Chester about 0.5 mile downstream from the dam site.
Annette Island has rolling and rugged mountainous terrain
rising to 3591 feet at Tamgas Mountain which is six miles
southeast of Chester Lake. The Chester Lake valley was glacier
formed, having steep sides and a broad base.
The climate is largely maritime with occasional incursions of
continental air masses. The climate is mild and humid with much
precipitation. Average temperature is 45.5°F with lowest recorded
temperature -4°F and highest 90°F. Precipitation varies with
location and increases with elevation. At the NOAA Weather Sta-
tion about six miles from the project area, the mean annual preci-
pitation is 112.02 inches.
Waterfall Creek is not an anadromous fish stream and no fish
are reported in Chester Lake or in Waterfall Creek.
General Description
Project Arrangement
Based on the economic analysis presented in Chapter V, the
recommended development of the Chester Lake resource is a 2.5 MW
storage project. A general plan of the project is shown on Exhi-
bit 26. A general profile of the project is shown on Exhibit 27.
The project will consist of the following principal
elements:
1. A concrete arch-gravity dam across the outlet of Chester
Lake and downstream from the existing dam.
2. An uncontrolled spillway in the center of the dam with a
design discharge capacity of 1000 cfs. The normal max-
imum reservoir level established by the spillway crest
will be El. 885.0
VII-l
3. A single port intake and a gated emergency outlet con-
duit, located on the upstream face of the dam.
4. A water conduit, 28 inches in diameter and 2800 feet
long, connecting the intake to the powerhouse. The
water conductor will be a steel surface penstock,
supported on saddles with anchor blocks provided at
major bends. A valve house, with remote control
emergency closure valve for the penstock, will be
provided.
5. A powerhouse containing a Francis type turbine and gen-
erator, rated at 2.5 MW, control equipment and electri-
cal switchgear. The adjacent switchyard will contain
the transformer and transmission line pull-off struc-
ture.
6. The access walkway, about 1800 feet in length, from the
end of the existing Walden Point Road at the southwest
end of Port Chester to the powerhouse site.
7. A transmission line, one half mile in length, connecting
the project with the existing Metlakatla Power and Light
transmission and distribution system east of Metlakatla
along Walden Point Road.
Project Functional Design
The project will regulate the outflow of Chester Lake for the
production of power and energy. The project will have an instal-
led capacity of 2.5 MW and an average annual energy production of
10.3 GWh. ~he firm annual energy production will be 7.9 GWh.
The electrical system is at times affected by fluctuating
loads from the sawmill. The Francis turbines are favorable to
accommodate such load changes. The relatively short penstock
length should also allow response to the sudden load peaks. Study
of governor timing, hydraulic transients and unit characteristics
to meet the system load demands will be made in the design phase
for the project. Sufficient WR2 will be provided to obtain as
much system stability as practical.
Geology of Foundations ~ Construction Materials
The geologic investigations in this study are described and
discussed in Appendix A of this report.
VII-2
~idrologic Aspects
The average annual and average monthly flows from Chester
Lake for energy evaluation were computed by adjusting estimated
Purple Lake flows by drainage area ratio. A discussion of the
techniques used to estimate Purple Lake flows is given in Chapter
III. The average annual flow from Chester Lake is estimated to be
22 cfs.
Description of the Project Facilities
Dam and Spillway
A concrete arch-gravity dam containing an ungated overflow
spillway is recommended to be constructed downstream from the
existing water supply dam as shown on Exhibit 28. Sectional views
of the dam are shown on Exhibit 29.
The maximum height of dam will be about 80 feet above deepest
excavation and the entire foundation of the dam will be excavated
to sound rock.
Based on reservoir optimization studies performed using a
mass curve of inflow data, the optimum maximum normal reservoir
elevation and spillway crest elevation are at El. 885. The spill-
way will be located in the center portion of the dam and will be
uncontrolled, with a width of 25 feet. The spillway will dis-
charge onto a reinforced concrete apron anchored to the rock
foundation at the toe of the dam. The spillway will have a
discharge capacity of 1000 cfs with the reservoir at El. 890 or
5 feet above the normal maximum level. If a flood exceeds the
spillway design discharge, overflows of the arch gravity dam can
be passed without damage to the dam or its foundation. OVerflows
of the existing water supply dam abutments are a common occurrence
and do not appear to have damaged the dam or its foundation.
A grout curtain will be constructed under the dam to reduce
seepage through the rock foundation. The grout holes will be
angled to intercept as many joints as possible. A drainage cur-
tain will be provided downstream from the grout curtain.
The selection of the recommended type of dam is based on the
following considerations:
Construction materials available at the site consist of rock-
fill which would have to be quarried. No earth fill material is
available at site; thus, a dam composed of such material can be
eliminated from consideration. A rock-fill dam with aluminum fac-
ing was proposed in the 1977 Definite Project Report. Earthquake
resistance of aluminum facing is not known and its use is not
VII-3
recommended. Costly anchorage, expensive joints to provide water-
tightness and difficulty to repair also make aluminum undesirea-
ble. Steel plates of corrosion resistant "Cor-ten" or "Mayari R"
are considered better than aluminum. Rock-fill dams with steel
facing have been constructed and have performed satisfactorily.
However, steel-faced dams require maintenance, which involves
drawing the reservoir down to expose the plates. Draw down of the
lowest portion of the reservoir would not be acceptable at Chester
Lake since it also provides water supply for the community. Rein-
forced concrete facing for a rock-fill dam is another choice~
however, construction costs estimated for a rockfill dam with an
upstream reinforced concrete face compared to a concrete dam show
no significant difference. Estimates of cost for both reservoir
elevation 885 and 845 rockfill dams were compared with correspond-
ing concrete dams of the arch-gravity type. Neither height of
rockfill dam would result in a a significant reduction in project
cost compared to the arch-gravity dam.
Construction aspects, because of the canyon shape, make
placement of any dam material difficult. A smaller volume con-
crete dam has an advantage over rock-fill for material placement
in the steep canyon sides. The foundation consists of exposed
bedrock adequate to support a concrete dam and is described in
Appendix A of this report on geology. The intake for the pen-
stock, outlet conduit and water supply pipe are simplest to incor-
porate into a concrete dam. Gate operating stems on the upstream
face of a concrete dam will be less costly than along the face of
a rock-fill dam. Gate stems on a concrete dam would also be less
exposed to reservoir ice.
The spillway for a rock-fill dam would be a side channel
excavated through the right abutment. The amount of excavation
would be substantial.
There is no clear cost advantage of anyone type of dam. Of
the concrete dam types the buttress dam with relatively large
amount of steel reinforcement would be the most costly. The gra-
vity dam with largest mass of concrete would be slightly more
expensive than arch or arch-gravity dams. An arch-gravity dam
will have favorable structural behavior for resistance to sliding
for the foundation conditions of the site. The horizontal to
moderately dipping joints near the foundation surface may not
provide sufficient resistance to sliding for a gravity dam. Arch
and arch-gravity dams obtain additional sliding resistance by
exerting thrusts into the abutments. Such action overcomes the
expected lack of cohensive strength of the foundation along hori-
zontal joints. For this reason, an arch dam is preferable to a
gravity dam. Use of a thin arch dam would however require addi-
tional study of the foundation as described in Appendix A. Cool-
ing of concrete during construction would also be required. Its
VII-4
volume would however be-the smallest of any dam type.
gravity dam would not require cooling and combines the
features of stabilizing reactions and cost; therefore,
type of dam recommended.
Intake
An arch-
favorable
it is the
As shown on Exhibit 29, an intake with trashrack and a slide
gate will be located on the upstream face of the dam. The intake
will be set low enough to permit drawdown of the reservoir to
El. 845 while maintaining adequate submergence of the intake, and
ensuring no decrease in storage for municipal water supply. Water
for power production will pass from the intake to the penstock via
a bell-mouth entrance and transition section.
A motor operated butterfly valve located in the valve house
downstream of the dam on the left abutment will provide positive
shut off in an emergency or for penstock repair and maintenance if
required.
About 10 acres of bushes and trees around Chester Lake will
be inundated at the proposed normal reservoir level. These will
be cleared during construction, and it is expected that little
trash will reach the intake. Intake velocities through the trash-
rack will be less than 3 feet per second so the intake port can be
set close to the bottom of the short approach channel without the
danger of rocks being carried into it. The existing dam will also
serve to trap sediment and debris. With the deeply submerged
intake ice should not be drawn into it.
An emergency outlet conduit with a manually operated gate
will also be provided. This conduit will be 42 inches in diameter
and will serve as the diversion conduit during construction and
could be used for reservoir evacuation in an emergency.
Penstock
The penstock which will convey flow for power generation from
the reservoir to the powerhouse, will be a 28 inch diameter steel
pipe, 2800 feet long, supported on saddles with concrete anchor
blocks at major bends. Penstock sections will generally be 40
feet in length and will be joined by sleeve type flexible coupl-
ings.
The most economical diameter is computed to be 28 inches for
the 2,500 kW generating unit. This diameter would have the lowest
combined annual cost and value of energy lost from hydraulic los-
ses in the penstock.
VII-5
The steel penstock will be fabricated from standard pipe
steel and will be painted for corrosion protection. The wall
thickness of the steel pipeline will vary from 0.19 inches to 0.31
inches.
Powerhouse
The powerhouse will have a reinforced concrete substructure
and superstructure with a precast concrete roof. The interior
dimensions of the powerplant will be 47 feet long by 30 feet wide
by 22 feet high from generator floor to the roof. A plan and
sectional views of the powerhouse are shown on Exhibit 30.
Descriptions of the major equipment items are given in the
following paragraphs. A one line diagram of the project is shown
on Exhibit 31.
Turbine. The turbine will be a Francis type rated to produce
2700 kilowatts at a net head of 800 feet at 1200 rpm. At the
rated output and head the turbine will discharge 44 cfs.
Generator. The generator will be rated to
ver the maXlmum rated turbine output at an 0.80
out exceeding an 85°C winding temperature rise.
phase, 60 Hz, and have a rated terminal voltage
continuously deli-
power factor with-
It will be three-
of 4,160-V.
The generator will be horizontal, directly connected to the
turbine. It will be totally-enclosed, self-ventilated, and be
complete with bearings and accessory equipment.
The excitation will be high-speed static type, complete with
a solid-state voltage regulator. Either a brushless, rotating
exciter or a potential-source, static exciter will be used, depen-
ding on the manufacturer's standard.
Main Transformer. The main transformer, will be 3-phase, 2-
windi~rated 12.5-4.16 kV. It will be oil-filled, self-cooled
type, and located outdoors adjacent to the powerhouse.
Generator Switchgear. The generator switchgear will consist
of the followlng major ltems:
1. One metal-clad generator circuit breaker of the air-
magnetic or vacuum type.
2. Instrument transformers.
3. A 100-kVA, 4,160-480/277-V station service transformers
and 480-V distribution switchboard consisting of molded-
case circuit breakers.
VII-6
4. Plant control and protective relays.
Connections to the generator switchgear from the generator and
main transformer will be made with cable.
Communications Equipment. Voice and control tone equipment
will be provlded for communlcations between the Chester Lake Pow-
erhouse, the reservoir, and the Purple Lake Powerhouse. The con-
trol tone equipment will enable the generator to be remotely con-
trolled from the Purple Lake Powerhouse through suitable control
panels. OVerhead telephone cable will be utilized for communica-
tion.
Switchyard Equipment. The switchyard equipment consists of
an oil circult breaker, disconnecting switches, and instrument
transformers.
Powerhouse Crane. The powerhouse will be provided with a
bridge crane of 15 ton capacity to handle the heaviest lift anti-
cipated. The crane, which will be supported by steel beams, will
be used to unload and erect equipment during construction and to
facilitate maintenance.
Access
Access to the damsite at Chester Lake is presently by heli-
copter or by foot on an existing path and wooden walkway along the
water supply pipeline alignment. Since there will be minimal need
for access to the dam during project operation the current access
options are considered adequate. Access for dam and penstock
construction could be by helicopter, cableway, tramway or by some
other method. Since no permanent facility is required, it is
normal practice to allow the construction contractor to select the
access method best suited to his own resources. For this study
access by either cableway or helipcopter was assumed for cost
estimating purposes.
Access to the powerhouse site, on the right bank of Waterfall
Creek at Port Chester, is currently by boat. Three alternatives
for permanent access to the site have been investigated. These
are an access road in a cut, an access road on a fill, or an ac-
cess walkway plus boat or barge access.
Access to the powerhouse site by a road in a cut along the
shore of Port Chester corresponds roughly to a proposed plan for
extension of Walden Point Road which was studied by the Bureau of
Indiana Affairs (BIA). The BIA investigated a route that would
rise from the existing road to the bench (about El. 200) above the
powerhouse site. The road would have been constructed in a exten-
sive cut through the talus depoists along a portion of Port
VII-7
Chester's shore and involved construction of a retaining wall
throughout the 1800 foot length of this section of the road. The
BlA shelved the road extension project because of the road's high
estimated cost and resulting uncertain slope stability of the
talus deposits due to the large cut. The BIA now estimates that
such an extension of Walden Point Road to Waterfall Creek would
cost about $1.75 million at 1982 price levels. Based on this
information, the BIA routing was eliminated from further consid-
eration.
To minimize the potential for slope failures and mass move-
ments of the talus deposits, a second road access plan was
developed. The road would be constructed entirely by placing a
rockfill on the existing slope at tide water elevation along the
shore of Port Chester. The slope and existing vegetation would
be undistrubed by such construction. A bridge would be requried
to cross the mouth of Waterfall Creek. The road would be used
for access during construction and thereafter. It is estimated
that this alternative would require 85,000 cu.yd. of fill and
would cost $1,540,000 at January 1982 price levels.
Access by boat or barge and walkway was also investigated.
The project will be capable of remote operation and will not
require daily maintenance. Personnel and small tools and supplies
could be brought in to the site over a wooden walkway from Walden
Point Road. Large supplies could be delivered by barge. Con-
struction access would be by barge, in the absence of a road, and
a floating construction platform would be stationed at the power-
house site during construction. The cost of access during con-
struction and construction of the permanent facilities is estimat-
ed to be $1,060,000.
The boat and walkway access alternative was selected in the
interest of minimizing project costs.
Transmission
A single circuit 12.5 kV transmission line will connect the
project with the Metlakatla Power and Light transmission and dis-
tribution system. The transmission line, beginning at the power-
house site, will follow the access road to Walden Point Road
and continue along the existing road to its intersection with the
Metlakatla Power and Light transmission line from Purple Lake.
A single circuit 12.5 kV wood pole line is proposed. This
line would be constructed in accordance with REA Type 408. Like
the existing transmission line, the new line would have four 2/0
ACSR conduits, (three phases and neutral). Three disconnecting
switches, one each for the lines to Metlakatla, Purple Lake and
Chester Lake, would be provided at the interconnection point.
VII-8
Reservoir
The reservoir created by the dam will raise the present nor-
mal full elevation of Chester Lake 40 feet. The normal maximum
reservoir will be El. 885. The proposed upper reservoir level wa~
derived from comparative mass curve and present worth analyses
prepared for alternative normal maximum reservoir levels of
El. 875, 885 and 897. The present worth analysis was prepared for
the most likely load growth scenario and was based on the combined
use of Purple Lake, Chester Lake and diesel units for energy gene-
ration during the 50 year life of the Chester Lake Project. The
minimum pool elevation for power generation will be El. 845, which
is the elevation of the existing spillway crest. Storage below
this elevation will be reserved for municipal water supply.
Reservoir operation between El. 845 and El. 885 will provide a
useable storage of 4180 acre feet for power generation. Exhibit
32 gives the reservoir area and volume curves.
Municipal Water Supply
Municipal water supply for Metlakatla is conducted from the
existing dam by a pipeline. The pipeline r~ns through the pro-
posed project construction area and consequently it will be re-
routed during construction of the new dam.
The existing water supply intake and valve will be abandoned
in place and the portion of the 8 inch diameter supply line up-
stream of the new dam will be removed. A new trashrack, intake
and valve and reconnect ion to the existing pipeline will be in-
stalled as a part of the proposed project.
Estimated Project Costs
Construction Cost
The construction cost of the Project is summarized on Ta-
ble VII-l and a detailed estimate is shown as Exhibit 12. The
construction cost includes the direct cost of civil works, con-
tractor's overhead and profit, purchase and installation of equip-
ment, contingencies, engineering, and owner's administration, but
excludes price escalation beyond January 1, 1982 and interest
during construction.
Detailed estimates of quantities were calculated from the
project plans, and unit prices or lump sum costs were estimated
for each item of work.
The items within each project feature are estimated either as
part of a general construction contract or an equipment purchase
contract. The unit costs of labor and locally available construc-
VII-9
tion materials were obtained from local sources. Construction
equipment unit costs were developed from lower U.S. hourly rates
adjusted to local conditions. Unit prices for the principal items
of work are based on a construction plan designed to implement
construction of the project in accordance with the construction
schedule as shown on Exhibit 33.
The direct cost estimated for the permanent equipment inclu-
des purchase, delivery and installation. The major equipment
items include the turbines and governors, generators and exciters,
transformers, switchgear, and powerhouse crane. The prices of
major equipment items are estimated based on recent experience
with similar equipment, and on preliminary quotations from manu-
facturers.
Table VII-l
CONSTRUCTION COST OF PROJECT
(In dollars at January 1982, Price Level)
Item
1. Mobilization
2. Cableway Access to Dam Site
3. Dam, Spillway & Intake
4. Penstock
5. Powerhouse
6. Access Road to Powerhouse
7~ Mechanical & Electrical Equipment
8. Transmission Line
Subtotal
+ 15% Contingency Allowance On All Items
Except No. 7
+ 10% Contingency Allowance on Item No. 7
Engineering
Owner's Overhead & Administration
Total Construction Cost at January,
Price Level
1982
Cost
$ 485,000
1,624,000
2,869,020
897,300
800,550
1,055,000
1,972,000
70,000
$ 9,772,850
1,170,150
197,000
1,300,000
700,000
$13,140,000
To allow for unforeseen construction circumstances, changes
in design, and incomplete data or omissions in estimating, a con-
tingency allowance of 15% is added to the civil works costs. A
VII-IO
contingency of 10% is rdded to the cost of major items of generat-
ing equipment.
Based on our experience obtained from other hydroelectric
projects and consideration of estimated services needed on this
project, an allowance of $2,000,000 for engineering and Owner's
overhead expenses has been included. This consists of $1,300,000
for engineering and a resident engineer at the site during
construction, and $700,000 for Owner's overhead and administration
costs including providing assistance to the resident engineer.
Operation and Maintenance ~
The project would be equipped for remote control operation
from the Purple Lake powerhouse. Routine operation and mainte-
nance expenses are estimated at $65,000 per year, including the
transmission line.
Environmental Aspects
Previous Studies
In the Definite Project Report, Chester Lake Hydroelectric
Project July, 1977, for the Metlakatla Indian Community (MIC),
Appendix C deals with environmental aspects of the Chester Lake
Project. A draft Exhibit W -Environmental Report for Chester
Lake Hydroelectric Project was also prepared and was submitted to
the Rural Electrification Administration (REA) as MIC's Borrower's
Environmental Report in accordance with REA regulations. These
reports adequately describe the environmental aspects of the pro-
posed project.
Rural Electrification Administration Final Environmental Statement
and Findlng of No Signlficant Impact
REA's Final Environmental Statement on the Chester Lake Hy-
droelectric Project is included in this document as Appendix C.
After consultation with State of Alaska and federal resource agen-
cies, REA reached a Finding of No Significant Impact for the pro-
posed project.
Permits and Other Authorizations
cOdPs of Engineers Permits. Before the project can be con-
structe , tEe U.S. Army Corps of Engineers (Corps) authorization
must be obtained pursuant to Section 10 of the River and Harbor
Act of 1899, and to Section 404 of the Clean Water Act of 1977.
MIC has submitted to the Corps an application dated 23 Janu-
ary 1981 for the necessary permits. Any change in powerhouse
VII-II
location, tailrace location, location of the outfall line, loca-
tion or size of the dam, or quantities or location of powerhouse
and access road fill as described in the 23 January 1981 applica-
tion will require amendment of that application. Changes should
be officially communicated to the Corps as soon as possible, in
order to avoid delay in obtaining the necessary permits.
1928 Powerhouse as Historic Site. Under Federal regulations
36 CF~O, any proposed modiflcatlon of the old powerhouse will
require a study to determine its eligibility for inclusion on the
National Register of Historic Places, and subsequent consultation
with the Alaska State Historic Preservation Officer. Whether or
not the site was determined eligible for the National Register,
such a study could be time-consuming and could delay construction
of the project. No disturbance of the 1928 powerhouse would occur
with construction of the project as shown in this study.
Project Design and Construction Schedule
A schedule for design and construction of the Chester Lake
Project is shown on Exhibit 33. As shown on the schedule, if
design activities are authorized to proceed on March 1, 1982, the
project could ready for commercial operation by January, 1985.
The project construction would be carried out by separate
supply and construction contracts. Separate contracts for supply
of mechanical and electrical equipment, civil works construction
and, possibly, access road construction are anticipated. It is
expected that the civil works contractor will install the turbines
and generators under the supervision of the manufacturer's repre-
sentative for that equipment. Access road construction could be
performed by a local contractor or included in the project civil
works contract.
As shown on Exhibit 33, construction of the project is expec-
ted to take two years. It is assumed that engineering is authori-
zed to proceed on March 1, 1982 and that the contracts for equip-
ment supply and civil works construction are awarded in September,
1982 and December, 1982 respectively.
VII-12
LIST OF EXHIBITS
1. Population
2. Employment
3. Fuel Consumption
4. Energy Balance
5. Historical Peak & Energy Demand
6. Historical Monthly Energy Generation
7. Electrical Energy Sold by M.P.& L.
8. Electrical Energy Forecast, Pages 1 through 3
9. Power Market Forecast
10. Purple Lake Expansion, Cost Estimate
11. Triangle Lake, Sheets 1 through 7
12. Chester Lake Alternative 1, Cost Estimate
13. Chester Lake Alternative 2, Cost Estimate
14. Chester Lake Alternative 3, Cost Estimate
15. Load Duration and Peaking Energy
16. Economic Analysis, Chester Lake Alternative Plans
17. Economic Analysis, System Expansion Plans
18. Economic Cost of Heating Energy
19. Cost of Energy -purple Lake, Chester Lake, Diesel:
Most Likely Load Growth
20. Cost of Energy -Purple Lake, Chester Lake, Diesel;
Low Load Growth
21. Cost of Energy -Chester Lake Alone: Most Likely Load
Growth
-i-
LIST OF EXHIBITS (Cont'd)
22. Cost of Energy -Chester Lake Alone; Low Load Growth
23. Annual Cost of Heating Energy, Most Likely Load Growth
24. Annual Cost of Heating Energy, Low Load Growth
25. Chester Lake, General Map
26. Chester Lake, General Plan
27. Chester Lake, General Profile
28. Chester Lake, Dam and Spillway, Plan
29. Chester Lake, Dam and Spillway, Elevation and Sections
30. Chester Lake, Powerhouse, Plan and Sections
31. Chester Lake, One Line Diagram
32. Chester Lake, Reservoir Area and Volume Curves
33. Chester Lake, Design and Construction Schedule
-ii-
Exhibit 1
ANNETTE ISLAND
POPULATION II
Year Historical Data
1890 823
1900 465
1910 602
1920 574
1930 466
1940 674
1950 1,119
1960 1,135
1970 1,800
1980 1,100
Projections
Low Most likely High
1985 1,140 1,160 1,200
1990 1,200 1,240 1,300
2000 1,300 1,400 1,500
Sources: U.S. Bureau of Census, Metlakatla Indian Community,
and Pacific Rim Planners, Inc.
11 Year-round residents
ANNETTE ISLAND
EMPLOYMENT
1977
Exhibi t 2
Category Spring Summer Fall Winter 'Average Annual
Forestry & Forest
Products
Fisheries & Fish
Products
Other Manufacturing
Contract Construction
Transportation &
Communications
Trade
Finance, Insurance &
Real Estate
Serv ices
Federal Government
State Government
Local Government
TOTALS
87
48
1.5
17
50
26
4.5
IS
142
40
73.5
504.5
87 82
282 98
1.5 1.5
24 7
49 52
29 25.5
4.5 4.5
16.5 15
148 21
10 40
101.5 87.5
753 434
Source: Pacific Rim Planners, Inc. estimates.
Note: Figures may not add due to rounding.
No. %
72 82 16.0%
28 114 22.3
1.5 1.5 0.3
10 15 2.9
52 51 10.0
24 15.5 5.0
4.5 4.5 0.9
13.5 15.5 3.0
19 82.5 16.1
40 33 6.5
84.5 86.5 16.9
349 511 100.0
Diesel
Electric Generation
Transportation
Industries
Subtotal
Fuel Oil
Res. & Com. Heating
Schools
ANNETTE ISLAND
FUEL CONSUMPTION
YEAR 1980
Gallons
(
(
250,000];/
150,000
100,000
500,000
Public Building & Misc.
lO,OOO
50,000
20,000
Subtotal 100,000
Gasoline
Transportation 60,000
Wood
Res. & Com. Heating 90,000~1
Hydropower
El~ctric Generation 1 , 2 50 , 00 O.!/
Total 2,000,000
:
Exhibit 3
, of Total
12.5
7.5
5.0
25.0
1.5
2.5
1.0
"""""S':O
3.0
4.5
62.5
100.0
Sources: Metlakatla Power and Light, Annette Hemlock Mills,
Annette Island packing Company, Metlakatla Indian
Community, Fuel Distributors.
II Fuel Oil Equivalent, based on 12 kWh per gallon
~I Fuel Oil Equivalent, based on 60 gallons of fuel per ton
of wood
(UNITS: BILLION BTU'S)
REJECTED
ENERGY
USEfUL
ENERGY
~
EXHIBIT 4
ALASKA POWER AUTHORITY
METLAKATLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
1980
ENERGY BALANCE
~ __ ~ __ E:N:G:IN:EE:R:IN:G~C:O:MP::A:N~y~:e:~:U~A~R:Y~':"~ __________ ~ __ ~ __________________________ ~ ____ ~ __ ~ ____ --______ ~ ________ ~
ANNETTE ISLAND
HISTORICAL PEAK AND ENEHGY DEMAND
1975 1976 1977
Total Energy Generation(MWh)!i
Hydropower Plant 14,912 14,273 13,095
Diesel Plant 2,514 1,433 3,472
Total 17,426 15,706 16,567
Energy Sold (MWh)
Residential
Number of Customers 303 318 339
Per Customer Consumption(kWh) 21,800 19,900 18,500
Total Demand (MWh) 6,614 6,337 6,285
Public Buildings and Lighting 568 748 886
Small Commercial 1,351 1,423 1,384
Large Commercial and Industrialll 5,565 5,089 6,280
Total 14,098 13,597 14,835
Peak Demand (kW) 5,280 4,440 4,470
Load Factor ( , ) 37.7 40.4 42.3
Source: Metlakatla Power & Light; REA Form 7, REA Form 12e
Includes station service.
1978
12,714
2,798
15,512
332
19,100
6,338
846
1,362
6,018
14,564
4,000
44.3
1/
2/ Does not include energy generated by Annette flemlock Mills.
In 1980, the sawmill generated about ]00 MWh.
Exhibit 5
1979 1980
12,653 14,994
3,227 2,694
15,880 17,688
332 350
16,300 18,500
5,410 6,475
790 846
1,195 1,472
", '
5,213 6,095
12,608 14,888
4,600 4,770
19.4 42.3
Exhibit 6
ANNETTE ISLAND
HISTORICAL MONTHLY ENERGY GENERATION
Net Ener~~ Generatedll Peak Load 7R3fil Dleae! Total Demand Factor
(MWh) ~ (kw) (' )
Year 1980
January 1,421 352 1,773 4,770 50.0.
February 1,246 568 1,814 4,050 64.3
March 1,369 270 1,639 4,000 55.1
April 1,231 150 1,381 4,380 42.4
May 1,147 221 1,368 4,485 41.0
June 992 265 1,257 3,570 48.9
July 1,081 147 1,228 3,740 44.1
August 1,117 77 1,194 3,700 43.4
September 1,037 65 1,102 3,640 42.0
October 951 26 977 3,860 34.0
November 1,549 214 1,763 4,330 56.5
December 1,433 208 1,641 .,720 46.7
Annual 14,574 2,563 17,137 4,770 41.0
Year 1979
January 1,245 219 1,469 4,000 49.2
February 1,270 228 1,498 4,400 50.7
March 1,106 115 1,221 4,000 41.0
April 940 169 1,109 3,180 48.4
May 1,073 303 1,376 2,920 63.3
June 808 289 1,097 2,830 53.8
July 889 386 1,275 3,400 50.4
August 828 343 1,171 3,400 46.3
September 826 262 1,088 2,650 57.0
October 936 265 1,201 3,315 48.7
November 985 285 1,270 3,900 45.2
December 1,274 212 1,486 4,600 43.4
Annual 12,180 3,076 15,256 4,600 37.8
Year 1978
January 1,284 19 1,303 3,500 50.0
February 1,087 10 1,097 2,800 58.3
March 1,120 72 1,192 3,300 48.5
April 962 160 1,122 3,200 48.7
May 857 275 1,132 2,900 52.5
June 730 274 1,004 3,000 46.5
July 807 290 1,097 3,000 49.1
August 638 551 1,189 3,500 45.7
September 847 268 1,115 1,200 48.4
October 947 237 1,184 3,300 48.2
November 1,052 254 1,306 2,900 62.5
December 1,197 286 1,483 4,000 49.8
Annual 11,528 2,696 14,224 4,000 40.6
Source: Metlakatla Power and Light: REA Form 12e.
II Excludes station service.
Exhibit 7
ANNETTE ISLAND
ENERGY SOLD BY METLAKATLA POWER AND LIGHT
(MWh)
Public t Large t
Residen-Building Small Commercial
1980 tia1 & Li9htin9 Commercial , Industrial TOTAL
Jan. 1,037 98 135 610 1,880
Feb. 580 61 137 560 1,338
Mar. 585 85 150 580 1,400
Apr. 585 92 145 435 1,257
May 490 71 123 538 1,222
June 322 42 91 627 1,082
July 372 42 104 474 992
Aug. 423 57 103 -425 1,008
Sept. 334 68 112 425 939
Oct. 496 73 120 324 1,013
Nov. 572 82 135 567 1,356
Dec. 679 75 117 530 1,401
TOTAL 6,475 846 1,472 6,095 14,888
1981
Jan 711 102 168 620 1,601
Feb. 665 92 155 337 1,249
Mar. 561 78 134 401 1,174
Apr. 582 88 131 377 1,178
May 457 85 118 454 1,114
June 419 49 130 535 1,133
July 371 38 117 663 1,189
Aug. 361 41 124 567 1,193
Sept. 410 63 138 406 1,017
Source: Metlakatla Power and Light, Billing Books
Exhibit A
Page 1 of 3
ELECTRICAL ENERGY FORECAST
MOST LIKELY SCENARIO
PEAK AND ENERGY DEMAND
Annual Annual
Growth Growth
1980 1985 Rate 1990 Rate 2000
(iT (T)
Residential
Number of Customers 350 410 425 455
Per Customer Consumption(kWh) 18,500 17,000 16,500 16,000
Subtotal 6,475 6,970 7,010 7,280
Small Commercial 1,472 1,550 1.0 1,630 1.0 1,800
Large Commercial and Industrial
Fisheries 1,000 1,300
Forest Industries 4,000 5,600
Others 1,395 1,470
Subtotal 6,395 8,370 2.0 9,240 2.0 11,260
Public Buildings and Lighting
Existing Facil ities 846 846
Swimming Pool 1,020
Vocational Shop 220
Harbor Facilities 100
Street Lighting 20
Subtotal 846 2,250 2.0 2,480 2.0 3,030
Total Energy Demand (MWh) 15,188 19,140 20,360 23,370
Total Energy Generation (MWh) 18,000 22,010 23,410 26,880
Peak Demand (kW) 4,770 5,580 5,940 6,820
Exhibit 8
Page 2 of 3
ELECTRICAL ENERGY FORECAST
LOW SCENARIO
PEAK AND ENERGY DEMAND
Annual Annual
Growth Growth
1980 1985 Rate 1990 Rate 2000
(' ) ( % )
Residential
Number of Customers 350 400 410 430
Per Customer Consumption(KWh)18,500 16,000 15,000 15,000
Subtotal 6,475 6,400 6,150 6,450
Small Commercial 1,472 1,500 1.0 1,580 1.0 1,745
Large Commercial and Industrial
Fisheries 1,000 1,200
Forest Industries 4,000 4,800
Others 1,395 1,400
Subtotal 6,395 7,400 1.0 7,780 1.0 8,590
Public Buildings and Lighting
Existing Facilities 846 846 "
Swimming Pool 850
Vocational Shop 175
Harbor Facilities 75
Street Lighting 14
Subtotal 846 1,960 1.0 2,060 1.0 2,275
Total Energy Demand (MWh) 15,188 17,260 17,570 19,060
Total Energy Generation (MWh) 18,000 19,850 20,210 21,920
Peak Demand (KW ) 4,770 5,040 5,130 5,560
Exhibit 8
Page 3 of 3
ELECTRICAl. ENERGY FORECAST
HIGH SCENARIO
PEAK AND ENERGY DEMAND
Annual Annual
Growth Growth
1980 1985 Rate 1990 Rate 2000
( % ) ( % )
Re side n t i a 1
Number of Customers 350 430 455 505
Per Customer Consumption(kWh) 18,500 18,000 18,000 18,000
Subtotal 6,475 7,740 8,190 9,090
Small Commercial 1,472 1,620 2.0 1,790 2.0 2,190
Large Commercial and Industrial
Fisheries 1,000 1,400
Sawmill 4,000 6,000
Others 1,395 1,540
Subtotal 6,395 8,940 2.0 9,870 2.0 12,030
Public Buildings and Lighting
Existing Facilities 846 935 "
Swimming Pool 32@.35 1,200
Vocational Shop 100@.35 310
Harbor Facilities 150
Street Lighting 25
Subtotal 846 2,620 2.0 2,880 2.0 3,510
Total Energy Demand (MWh) 15,188 20,920 22,730 26,820
Total Energy Generation (MWh) 18,00' 24,060 26,140 30,840
Peak Demand (kW) 4,770 6,100 6,630 7,820
&.
I
C
Z • ~ w
C
>-" a: w
Z w
~ • :J
Z
Z
c(
35,000
30,000
25,000
20,000
CHESTER LAKE
DIESEL
15,000
10,000
PURPLE LAKE
5,000
O~------~------r------'------~
1980 ll1fi 1110
YEAR
1995
ENERGY DEMAND PROJECTIONS
2000
~
oX
C z • ~ w
C
~ • W
IlL
~ • :J
Z
Z
c(
10,000
8,000
',000
4,000
DIESEL
2,000
0
1110
EXHIBIT 9
CHESTER LAKE
PURPLE LAKE
"
1_ 1110 1115 2000
YEAR
PEAK LOAD PROJEeTIONS
ALASKA POWER AUTHORITY
METLAKATlA POWE R AND LIGHT
CHESTER LAKE HYDROelECTRIC PROJECT
POWER MARKET FORECAST
Preliminary
ESTIMATE HARZA ENGINEERING CO~IPA.NY
CBIC..,GO. ILLINOIS
PURPLE LAKE EXPANSION t·1arch, 1982 3 Profec, ______________ Date ________ Pa;e ___ of ___ Pa;es
s,ructvre __ S_u_mm_a_r~y_-_l_O.....;;O...:..O.....;.;..kW _________ E.tima'ed by~GJ.;...K",,""-___ Checkeci by ___ _ .... ITIM QI ill, Unit Prb ..... No.
1 IMohi1 i7ation ~ .J2..5. ~
? IW.:\tl:ll'" ronnlJ,.tnl'" 111 ... 1 ?n
< I Dnwt:ll'" nOll C;P -<n1 <7n
4. ~echanical & Electrical Equi~ent 1 140 000
5. Substation Improvements (
40 000
Subtota 1 $ 1 748 490
Contingencies:
+ 10% -on Item No. 4 114 000
+ 25% -on All Other 152 510
rT'otal Direct Construction Cost $ 2 015 000
(nq i neer i nq 325 000
Owner's Overhead & Administration 260 000
~otal Construction Cost @ January 1982 Leve $ 2 600 000
I-
I
f--
I---
,
I I
Preliminary
ESTIMATE HARZA ENGINEERING CO~[PANY
CB.ICAGO. ILLINOIS
Exhibit 10
"otect __ P_ur_p_1_e_L_a_k_e _E_x_pa_n_s_i o_n ____ OOte __ M_a r_c_h_1 9_8_2 ___ Pov e 2 of_...:..3 __ Poges
1000 kW GJK Structure _____ ~ __________ Esti"'ateci by _____ Cltecked by __ _ .... ITIM Q .1 , u ....... ,.....
No.
1. r~obilization t 125 ~OO ...
~
2. Water Conductor --
2.1 Penstock -3~'' 0 ~ JtnM 11l~ 4.70 17 Inoo
2.2 Excavation COlTl'l1on AD ~ 12 sn l!:inn
2.3 Excavation Rock Trench lir..v 2£;n nn R 17 c;n
2.4 Excavation Concr~te 700 Ft 3 " nn .1 bnn
12.5 Concret~ Structural 10 cv ?lM nn ?1 l(1nn
12.6 Trench Bac!cf; 1 1 ~r;tvel I\n cv 114 nn R InAO
12.7 Ruttprflv Valve 3~'' Q! 1 p;tC' h 22 Inon
I? ~ C'nnnpr1'inn to Trifllr~tiQn L. S. 11\ hnn
12 q Valve Ac:r:~~c; M;tnhnlp 1 ead1 2 17 00
12 10 Fr;tmp ~ rnvPI" 700 1 bs lqn 1 t11n
Subtotal IteTI 2 t h.1 ? ?n
~.O Powerhouse - -~. 1 Excava tion, Common ~ i.JJ l?Cin 1 h ?s
~.2 Excavation, Rock 130 cy 250.00 32 ~OO
~.3 Concrete, Substructure 130 cy 1040.00 135 ~OO
S.4 Masonry, Concrete Block 410 SF 19.00 7 790
3.5 Structural Steel --
a. 5. 1 Columns, Beams, Crane Rail 7000 1 bs 2.30 16 100
3.5. ~ Roof Truss· 5000 1 bs 2.30 11 500
~.6 Corruga ted Meta 1 Bui 1 ding --
a. 6.1 Remove Existing Wall 720 SF 19. 00 ' 1 ,~ 680
a. 6. ~ New Wall s 1450 SF ") ----
9.6. ~ New Roof l2!lO ~ 1 30 600
,.7 Architectural Treatment 1..5. 20 000
a .8 HVAC I S 27 1000
~.9 Miscellaneous Metals 7 OOC
Subtotal I teTI 3 S 1301 1 37G
I
I
t-'re 11m1 nary
ESTIMATE BARZA ENGINEERING CO!IPANY
CBIC£.GO. ILLINOIS
Exhibit 10
"rofKt ___ P_u_r...;.,p_'_e _L_a_k_e_Ex....;p_a_n_s_i o_n ___ Dot._M_a_r_C_h_l_9_8_2 ___ Pag •. __ 3 __ of_~3 __ Page!
Structur. ___ l...:.O..:;..OO.;:;.....;.k.;,;.W~ ____________ E.ti"'ated by_---.;G;,;;J"""K'--__ Checked by ___ _ ... ITIM Q==IIy UnIt ftrtaI ~ I No.
4.0 Mechanical & E1 ectrical Equipment --~
I
4.1 Turbine & Governor 7 --
4.2 Generator, Excitation J L. S. 1 000 000/
4.3 Accessory Electrical Equipment L. S. 100 000 I
4.4 Subs tat; on & Transfonner , L. S. 40 000-1
Subtota 1 Item 4 $ 1 140 000
I
5.0 Substation Improvenents L. S. 40 000
Subtota 1 $ 1 748 490 I ,
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EXHIBIT l'
..sheet 1 of 7
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ALASKA POWER AUTHORITY
METLAKATLA POwER AND LIGHT
CHESTER LAKE HYDROELECTRIC PRCE --
TRIANGLE LAKE
DEVELOPMENT PLAN
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membr~ne ern I.I/s fac~ Df nxlfil/ d~ S~cf/(')n Thru S,P///WOJ
EXHIBIT 11
Sheet 2 of 7
Se_It! 111= /0 1-0 II
ALASKA POWER AUTHORITY
METLAKATLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
TRIANGLE LAKE
DAM AND SPILLWAY
, " /" = /() -0
~FCCMBER 186-~ZA ENGINE£AING r:r~PAN'I' ...J -
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EXHIBIT 11
Sheet 3 of 1
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E/. 372.5 2 l11L1111J~~~~~~~.~, .iiii.~ .. rH~;---1
ALASKA POWER AUTHORITY
METLAKATLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
TRIANGLE LAKE
INTAKE STRUCTURE
'= /!t, ~ ;
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EXHIBIT 11
Sheet 4 of 7
I '" 51 II : -0
ALASKA POWfft AUTHOftlTY
METLAKATLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
TRIANGLE LAKE
BURIED STEEL PENSTOCK
AND ACCESS ROAD
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ESTIMATE
Protect
HARZA ENGINEERING CO)[PANY
CBIC ..... GO. ILLINOIS
CHESTER LAKE -Alternative 1 Oa~ March, 1982
c:.A II I U I l. I '-
, Pa;e ___ of '. Po;es
Structure_----'501.1ouw!l!!1~a.:...ry~-._2'''"50~0~k.u..W.l..., ...a.E ....... l ........... 8 .... 8 .... S<--____ Estimated by Ram 0, Checked by KTW
..... ITIM QI II, Unit Prtc. AMOUIIt No.
1. Mobilization $ 485 000
2. Cabl eway Access to Dam 5i te 1 624 000
3. Dam, S pill wa y & Intake 2 869 020
4. Penstock • 1897 300
5. Powerhouse 1800 550
6. Access to Powerhouse and Cabl eway 1 055 000
7. Mechanical & Electrical Equ ipment 1 972 000
8. Transmission Line 70 000
Subtotal $ 9 772 850
+ ;5% Cont1ngency Allowance On All Items -
Except No.7 1 170 1 SO
! 10% Contingency Allowance On Item No.7 197 000
Total Direct Cost $11 140 ~
Ene; neer ; no , i1nn In nn
IOwner I s Over~ead ? Admi ni ~tr~ti on JOO loon
Total Construction Cost @ January 1982
Level $13 140 000
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ESTIMATE HARZA ENGINEERING CO!IPANY
CJIIC.&.GO. ILLINOIS
Exhibit 12
Chester Lake -Alternative 1 Date ~larch 1982 Pa;._.....:2=--_of 4 Page
Structur. __ 2S_0_0_k_W_,_E_1_,_8_8_S _________ Estimated by_R_am_D _' __ Checked by KTW
= .... ITIM Q ., Unit Itrb ~ No.
1 ~
$ 1. Mobilization LS 485 000
2. Cab1ewav Access to Dam Site 1 LS S 1 624 000
3, Dam. Soi11way & Intake --
3. 1 Dam & Reservoir Clearing 10 AC 5055.00 5Jl 1550
3.2 Diversion & Care of Water 1 LS 15 11.00
3.3 Dam Excavation Rock 1600 cy 'i? 00 a3 1200
3.4 Dr; 11 inQ 6040 LF 1£_25 ~2 110
3.5 Drill inq Setuos 320 each 220 00 70 40n
1.6 GroutinCl 1400 saks 15 75 5n n s r~
3.7 Rockbo1 ts 300 LF ?4 50 7 I~ sn
3.8 Concrete. Mass 5000 cy 434.00 2 17n In(Y'
l~ ~ncrete 5truct.tira 1 200 cy 618.00 123 600
3,10 Reinforcina Steel 45000 1 bs 1.43 64 350
3 11 roii S1:ellaneou s Metals 6000 1 bs 4.60 27 6ClO .--
1 12 Rock Anchors 2100 1 bs 4.10 8 610 --
.113 Tnt::l"'~ Excavation Rock 200 cy 66.00 13 200
-.. ,~
11 14 Tnbkp f,atp f,IJidpc:." i-Inic:.t 1 LS 20 OOC
1 1 c; ()lIt'~t r,::It~ r,lIidpc:. ~ Hoist 1 LS 19 000
1 1 h Tnt::lllp Trac:.hrilC"llc:. 1 LS 18 OOC -
1 17 CQlru-;!tp W"t~Y" C:llnnlv C:vc:.tPm 1 LS 1 5 SOC
-
Subtotal Item 3 $ 2 869 02C
4. Penstock --
4. 1 Penstock Steel & Couplings 80000 1 bs 2.75 1495 DOC
4.2 Penstock Anchor Blocks 240 cy 745. 00 178180C
4.3 Penstock Steel Supports 30000 1 bs 4.60 138 100:
4.4 Penstock Rock Anchors 6000 1 bs 4.10 24 160(
4.5 Penstock Rock Excavation 350 Cy 82.0J 2~ In: -<-I
4.6 Penstock Valve 1 LS 1 u l.Q.~
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EST'MATE HARZA ENGINEERING CO~IPANY
CBIC.GO. ILLINOIS
Exhibit 12
Chester Lake -Alternative 1 '~arch 1982 3 4 Prot-:t _____________ Date ________ Poge ___ of ___ Pog.,
Structure __ 25_0_0_k_rJ_,_El_._88_5 _________ Eatimoted by Ram D. KT\~ Checked by __ _ .... ITIM Q ., Unit ...... ~ No.
5. Powerhouse --
5.1 Clearing 1050 SY ~]O 1 1785
5.2 Line Dri11ing/Presp1itting 5000 SF 1;.75 33 1750
5.3 Excavation Rock < 1550 cx -.34.80 51 1940
5.4 Concrete 665 J:.Y 33J1 00 121 9 1450
5.5. Fonnwork 9750 SF ~Q.70 1104 1325
5.6 Reinforcing Steel 133000 1 bs J .43 11 <40 i1 qn
5.7 Precast Concrete Roof 2 ill --.S.E 10 00 74 17nn
5.8 Structural Steel Crane SUQPort~ IncludiM
Crane Rail 4600 1 bs 1.30 5 980
5.9 HVAC-P1umbinQ 1 LS 40 000
5.10 Architectural Trea tment 1 LS 21 000
5.11 Crushed Rock Fill 40 cy 74.50 2 980
5.12 Fence 40 LF 50.00 2 000
15.13 Drill ina for Drains 405 LF 15.00 6 07S
Ie; .14 Sptuos for nrain<: 27 each 220.00 5 940
15.15 'Rod Bolts on SloDe 3630 LF 24.50 88 935
Subtota 1 T t.:>m c; $ 800 SSO
h ArrQcc +n PnlolPl"'hnllcQ and Cablewav --
fi 1 Arrpcc tn PnlolQl"'hnllcQ Ann r.:lk1Q\oI.:Iv nlll"'inn
ronstrur:tion ~ I~ ~ , me:; Innn
h ? Ppl"'TTI.:Inpnt Al"rp<:c: W"llclol.:lv J U lln Innn
Subtota 1 Item 6 $ 1 055 000
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ESTIMATE BARZA ENGINEERING CO!IPANY
CBIC.A.GO. ILLINOIS
Exhibit 12
Prot-ct ___ C_h_es_t_e_r_L_a _ke_-_A_l-t_e_r_n_a_t_i v_e __ Oat• __ M_a_rc..:..,.h_1..;..9.;..82 ___ Pa;. 4 of __ 4 __ PO'i
2500 kW, E1. 885 Ram D. KTW Struclur. __________________ Eltimated by _____ Chec:ked by __ _ .... ITIM Q ...., Unit ".. "-aunt No.
7. Mechanical - -I--
7.1 Turbine & Governor & Generator 1 LS I $ 1 500 001
7.2 Accessory Electrical Equipment 1 LS 240 001
7.3 Substation & Transformer ~ 1 LS 110 Oar
7.4 Supervisory Controls at Purple Lake &
Messenger Cable from PH to Purple Lake 1 LS 62 OOi
7.5 Powerhouse Crane 15 Ton 60 001
Subtota 1 Item 7 $ 1 972 ~Ol
8. Transmlsslon Llne 1 LS $ 70 00
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ESTIMATE HARZA ENGINEERING COMPANY
CHICAGO, ILLINOIS
CHESTER LAKE -Alternative 2 March, 1982 11 Project ______________ Date ________ Po;e ___ of ___ Pa;es
Structure __ Su_lTITl_a_rY_-_2_S_00_k_W_, _E_l_,_84_S ______ E,timGted by_R_a_m _D_' __ Checked by __ K_TW __ .... ITIM Q......., Unit ..... ,..".,. No.
l. Mobilization $ 570 000
2. Access to Dam Site 895 000
3. Dam, Spillway & Intake 581 070
4. Penstock Co
"'
055 900
5. Powerhouse 892 490
6. Access to Powerhouse 520 000
7. Mechanical & Electrical Equ i J:JTlent 1 972 000
8. Transmission Line 70 000
Subtotal $6 556 460
+ 15% Contingency Allowance On All !tens
Except No. 7 677 540
~ 10% Contingency Allowance On Item No. 7 197 000
Total Direct Cost $7 431 000
Eng; neeri ng 1 130 000
Owner's Overhead & Administration 525 000
,
Total Construction Cost @ January 1982
Level $9 086 000
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ESTIMATE HARZA ENGINEERING CO!IPANY
C1UC4GO. ILLINOIS
Ex hi b; t i 3
Chester Lake -Alternative 2 March 1982 2 4 ___ Date, ________ Po;e, ___ of ___ PoQ.
Structure 2500 kW, E1. 845 Estimated by Ram D. Checked by_K_T_W __ .... ITIM Q ., UnIt".. ,."."" ....
1. Mobilization 1 LS $ 570 000
2. Ai r Lifti ng 1 LS " $ 895 000
3. Dam, Spi 11 way & Intake --
"
3.1 Dam & Reservoir Clearing , 1 AC S9QO,OO 5 900 ,
3.2 Diversion & Care of Water 1 LS 32 500
3.3 Dam Excavation Rock 500 cy 61 . 00 30 500
3.4 Drill ing 11 00 LF 17.50 19 250
3.5 Dri 11 i ng Setups 90 each 260.00 23 400
3.6 Grouting 400 saks 41.50 16 60C
3.7 Rockbo1 ts 300 LF 28.50 8 55C
3.8 Concrete, Mass 450 cy 510.00 229 SOC
3.9 Concrete, Structural 100 cy 725.00 72 SOC
3.10 Reinforcing Steel 24000 1 bs 1.65 39 60C
3.11 Miscellaneous Metals 1600 1 bs 5.40 8 64C
3.12 Rock Anchors 2100 1 bs 4.80 10 aBC
3.13 Intake Excavation Rock 150 cy 77 .00 11 55C
3.14 Intake Gate, Guides & Hoist 1 LS 20 ooe
3.15 Outlet Gate, Guides & Hoist 1 LS 19 ooe
3.16 Intake Trashracks 1 LS 18 Oar
3.17 Relocate Water Supply System 1 LS 1 5 50'
Subtotal Item 3 $ 581 07(
4. Penstock --
4.1 Penstock Steel & Coup1 i ngs 180000 1 bs 3.2~ $ 585 OO(
4.2 Penstock Anchor Blocks 240 Cy 875.0C 210 001
4.3 Penstock Steel Supports 300000 1 bs 5.4C 162 001
4.4 Penstock Rock Anchors 6000 1 bs 4.EO 28 80
4.5 Penstock Rock Excavation 350 cv 96.0C ~QQ
4.6 Penstock Valve 1 LS 10 LQ.Q
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4.7 Penstock Valve House 1 l S 26 ~ ,
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Subtota 1 I tern 4 S 1 1 055 ; 9'=
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ESTIMATE
Profect
BARZA ENGINEERING CO)IPANY
CBIC.GO. ILLINOIS
Chester Lake -Alternative 2 Dat. March 1982
txnlDlt 13
'0;. __ 3 __ of __ 4 __ Pa;e,
S"uctur. __ .;;....25~0;....;;0_kW-',:........;;E_' _ . ...,;8;...,4_5 _________ Estimotecl by Ram D. Checked by KTW ... ITIM Q '1, UftIt .... A.auM No.
5. Powers ta t ion --
5. , Clearing 1 nso sy 2 00 $ 2 100
5.2 Line Dri11ing/Presp1itting 5000 SF 7 QO 39 500
5.3 Excavation Rock 1550 cy 4n 50 62 775
5.4 Concrete , 665 cy I?S~ 35D ~QO M
5.5 Fonnwork Q7S0 SF 12 sn 1121 1875
5.6 Reinforcing Steel 133000 1 bs 1 E;S 121 9 1450
5.7 Precast Concrete Roof 2420 SF ,? nn ?q 1040
5.8 Structural Steel Crane Support, Including
Crane Rail A,;nn , ,",c 1 c;n h 1 Q(1()
5.9 HVAC-Plumbing 1 I~ <0 Innn
5.10 Miscellaneous Items J LS 1>< Innn
5. 13 Drains , I~ 1 1 1 !:inn
5.15 Roc k Bo lts on Slope 1 IS. Q:? Innn
Su btota 1 Item 5 $ 892 490
6. Access to Powerhouse --
6. 1 Temporary Access to Powerhouse During
Construction 1 LS $ 470 000
6.2 Permanent Access Walkway 1 LS 50 000
Subtotal Item 6 $ 520 000
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ESTIMATE HARZA ENGINEERING cn:&IPANY
Clllc .... GO. ILLINOIS
Chester Lake -Alternative 2 DaM March 1982
Ex nib i t 1 3
4 4 Pag.' ___ of ____ Pages
R 0 KTW Structur._.......::.2.:::.;50::..:0::....:.:k~W..!.., ...,:E:.,:1:....:.---=.8....:...45=--_________ Esrimated by, __ am __ . __ Checked by ___ -.... IT 1M Q. '1, Unit .... AatNM No.
7. Mechanical & E1 ec trica 1 Equipment --
7. 1 Turbine & Governor & Generator , lS : $ 1 500 000
7.2 Accessory Electrical Equipment 1 lS 240 IQQQ.
7.3 Substation & Transformer , 1 LS 110 000 ,
7.4 Supervisory Controls at Purple Lake &
Messenger Cable from PH to Purple Lake 1 IS 62 000
7.5 Powerhouse Crane 15 Ton , LS 60 000
C\llhtnt~' TtI:MT1 7 ¢; 1 Iqn loon
8. Transmission Line $ 70 000
.
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ESTIMATE DARZA ENGINEERING CO~IPANY
CBIC.4.GO. ILLINOIS
Profect CHESTER LAKE -Alternative 3 Oa~ March. 1982
tXnlDlt 1"+
PaV._ol.-_of 4 Pav·s
Structur. __ S...l.lI.wIDllD.lWliiLa.L..,ry,.......:-:....-Ll..uS OwD.L.....Iiok..a.W ..... ...I:E:....l1 ___ 8u.:4z..5.1..-_____ Estimated by Ram 0 Checked by KTW ... ITIM QI III, UNt~ A.ount No.
l. Mobil ization $ 570 000
12. I Access to Dam Site 895 000
13 IDam. Soillwav & Intake 622 355
14 Penstock -<. 807 660
5 I Powerhouse 759 365
16 IAccess to Powerhouse 520 1000
17 IMpchanical ~ Electrical Eauioment 1 1486 1000
18 ITriinsmiss;on Line 70 1000
Subtota 1 ~5 1710 1180
+ 15% Contingency Allowance On All Items
Except No. 7 636 620
+ 10% Contingency Allowance on I tern No. 7 1148 lono
I Tnf"::I 1 nil"'prf" rnc:.t. $6 5.l..5.... lOillL
Engineering 1 130 000
Owner's Overhead & Administration 525 000
Total Construction Cost @ January 1982
Level $8 170 000
1-
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Ex hi bit 1 4
ESTIMATE HARZA ENGINEERING CO!IPANY
CBIC .... GO. ILLINOIS
Chester Lake -Alternative 3 March 1982 2 4 'rofect ______________ Date ________ Pa;e ___ of ___ Pages
1500 kW, El. 845 Ram D. KTW Structure _________________ Estimated by _____ Checked by __ _
.... IT 1M Q. ..., Unit Prica ..,.,.
No.
l. Mobilization 1 LS $ 570 000
2. Access to Dam Site 1 LS : S 895 000
3. Dam, Spillway & Intake
3. 1 Dam & Reservoir Clearing , 1 AC p370.00 6 370 ,
3.2 Diversion & Care of Water 1 LS 35 100
3.3 Dam Excavation Rock 500 cy 66.00 33 DOC
3.4 Drill ing 11 00 LF 18.90 20 790
3.5 Drilling Setups 90 each 280.00 25 200
3.6 Grouting 400 saks 44.75 17 900
3.7 Rockbol ts 300 LF 30.75 9 225
3.8 Concrete, r~ass 450 cy 550.00 247 500
3.9 Concrete, Structural 100 cy 782.00 78 200
3.10 Reinforcing Steel 24000 1 bs 1. 78 42 722
3.11 Miscellaneous Metals 1600 1 bs 5.80 9 280
3.12 Rock Anchors 2100 1 bs 5.20 10 92:-
3.13 Intake Excavation Rock 150 cy 83.00 12 450
3.14 Intake Gate, Guides & Hoist 1 LS 20 000
3.15 Outlet Gate. Guides & Hoist 1 LS 19 000
3.16 Intake Trashracks 1 LS 18 000
3.17 Relocate Water Supply SYstem 1 LS 16 700
Su btota 1 I tern 3 $ Ifi22 i~;~
--.l
4. P~nstock -- !
14.1 Penstock Steel & Couo1inas 137000 lbs 3 SO 1479 500
14 2 Penstock Anchor Blocks 150 cv Q44 no 1141 16()r"
14 1 P~nstock Ste~l SuDoorts 185000 1hs " RO 11 n7 Il,d..
44 Penstock Qnr h Anr hnre:: 17no 1 he:: " ?n I J q I? " -
1
4 'i Ppnc;tot"k Rn1:.j( FlCt"al.Lation no rv , n4 nn 22 123...':-
4 fi Ppnc;tork Valvp 1 1<\ Q I('~---
14 7 Ppnc;tor\c V"lvp HOllC;P 1 1<\ 2 0 ~E~
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ESTIMATE HARZA ENGINEERING CO~IPA..NY
CBIC.£.GO. ILLINOIS
Chester Lake -Alternative 3 Do~ March 1982
Ex h; b; t 1 4
3 4 Page ___ of ___ Page
Slructur._~l 5~0;.;;O--=kW..;..I,:..-=.E~1.:..-;;8...;.4,;;..5 _________ Estimated by_R_am.........;D_· __ Checkecl by KTW ... ITIM Q ., UnIt,.. A.ount J No.
5. Powerhouse -----5.1 Clearing JtClO t:.v ? nn $ 1 17RO I
5.2 Line Dri11ing/Presp1itt1ng 4800 SF 7 em 17 IQ?n·
5.3 Excavation Rock L« 1460 cy 4n c;n 59 1130 I
5.4 Concrete 1il n r:..v _"t90. -.no 1717 IQno
5.5 Formwork 7900 SF , ? tin QR 7 !:in I
5.6 Reinforcing Steel 108000 1 bs J , ~c; I, 7P. ?nn
5.7 Precast Concrete Roof 1260 SF 1? no 1 c; l1?n I
5.8 Structural Steel Crane Support, I nc1 ud; n9 I
Crane Ra i 1 3100 1 bs 1 c;n .1. I,::;c;n
5.9 HVAC-Pl umbi ng 1 LS <f'l Innn I
5.10 Arch; tectura 1 Treatment 1 LS l~ lnno
5.11 Crushed Rock Fi 11 40 cy 71 or 2 IQ?n I
-'"
5. 12 Fence 40 LF 4q or, 1 1960
5.13 Drill ing for Drains 290 LF 1 c; nn 4 1c;01
5.14 Setups for Drains 19 each 21C; no -.4 oas I
5.15 Rock Bolts on Slope 2900 LF ?4 nn '::;Q /;nnl
I
Subtota 1 Item 5 S 759 365
_I
6. Access to Powerhouse - -
6.1 Temporary Access to Powerhouse During I
Construction 1 LS $ 470 000
6.2 Permanent Access Walkway 1 LS 50 0001 .
Subtotal Item 6 $ 520 000..
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exhibit 14
ESTIMATE HARZA E:-.··· ... dNEERING CO~IPANY
CHICAGO. ILLINOIS
Profect Chester Lake -Alternative 3 March 1982
Oat. P09. 4
of 4
P0ges
Structur • 1500 kW, El. 845 Estimated by Ram D. Check.d by KTW
.... ITIM Q ... , Unit PIice ~ No.
7. Mechanical & Electrical Equipment --
7.1 Turblne & Governor & Generator 1 LS $1 100 DOC
7.2 Accessory El ectrica 1 Equipment 1 LS 200 DOC
7.3 Substation & Transformer 1 LS 80 DOC
7.4 Supervisory Controls at Purple Lake &
Messenger Cable from PH to Purpl e Lake 1 lS 62 ODe
7.5 Powerhouse Crane 10 Ton 44 00'
Subtota 1 Item 7 $ 1 486 ooe
8. Transmission Line 1 LS $ 70 oDe
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EXHIBfT 15
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tCOltUN,C UlAlUIS ( ... ~ .. ".tl.Ee/l"l EXHIBIT 16
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METLAKATLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
ECONOMIC ANALYSIS
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ECUNOMIC ANAL "IS Il.~H .. ,El.:1I4'" EXHIBIT 16
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ALASKA POWER AUTHORITY
METLAKATLA POWER AND liGHT
CHESTER LAKE HYDROELECTRIC PROJECT
~-tAR Z.A .. I"JI .1f'JL t J lIN! . ( f "",,1 '1\"'.'" • 'VIAfV .4-4 ~~IA? ECONOMIC ANALYSIS -
tCOHO"IC AHAUSIS I, • 'lNII, H • =a"51 EXHIBIT 16 IHflA, JUIt MAIf z 0.00/1 flit t F !lCAlArlnH IIAlfa 0.0". 0,<;(01l1t' IIA If a 0.0'"
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ALASKA POWER AUTHORITY
METLAKATLA POWER AND LIGHT
CHESlER LAKE HYDROElECTRIC PROJECT
eCONOMIC ANALYSIS
l l.AR LA ,r ,I ,Ir·~t t 111f'41. r ! J',-1. '~~t,J. • MAl." ,., i~~'C.fL·
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ALASKA POWER AUHiORITY
METLAKATLA POWER AND LIGHT
CHESTEH LAKE HYLlHOl:HCTRIC PHOJl:CT
ECONOMIC ANALYSIS
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ALASKA POWER AUTHORITY
METLAKATLA POWER AND LIGHT
CHESTER LAKE HYDROElECTRIC PROJECT
~z..A fN(,INl::fr.lIN(i I OMf"1l\r'Jr • MAnrH 1982
ECONOMIC ANAL VSIS --------------'
t rONOM, r ANAL YlIS (1'~"' •• H .:11"'>' EXHIBIT 16
'NflAl.O" AAft"' n.nun f IIll fUnAl'I'IN NAIf. 0.0;> .. nU(.I'IUN. ""I': u.O'u
Nfl fllfHr( lI·lf~JA"'UIA' 1911l III ru!H:'I 'N , .null Page 7 of 9 ""H 5('HA ... 0
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ALASKA POWE R AUTHORITY
METLAKATLA POWEH AND LIGHT
CHESTER LAKE HYOROEUCTHIC PHOJECT
ECONOMIC ANALVSIS
l l.L'\..R LA. ; .1," HI. ~Ir'.,jl. I ( "'JU ·J\.f',j 1 • M •• n{ ~ '.!..::"j.-,,'
HONO"lr Ililil YS" Il.'> ..... n .aIlO'» EXHIBIT 16
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ALASKA POWER AUTHORITY
METLAKATLA POWER AND LIGHT
CHESTER LAKE HYOROELECTRIC PROJFCT
'--l..AR.ZA fNGINI::.ERING t:nMPA"'.Iy' • MACICH 19B2 ECONOMIC ANALYSIS -------.
tru ... "MI[ ANAl'SIS (1.~M.,t.l.z."~1 EXHIBIT 16 INF l A TlUN II A It z 11.000 flit l ESrAlATIOIil NA,t. O.O.!' OISLOUNI IIAIt. 0.010
NEHNf ... Lt UA IE=JA","ANY I"II.! All COSTS 1111 • 1000 Page 9 of 9 HI .. " UfNANlu
PIIEHIIREO PLAN
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ALASKA POWEH AUTHOHll Y
METLAKATLA POWER AND lIGtH
CHESTER LAKE HYOROEU:CTHIC PIiOJI:CT
~-lARZA ."
ECONOMIC ANALYSIS
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ALASKA POWER AUTHORITY
METLAKATLA POWER AND LIGHT
CHfSTER LAKE HYDROELECTRIC PROJECT
17
9
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ALASKA POWER AUTHORITY
ME TLAKA TLA POWE R AND LIGHT
CHfSTER LAKE HYOROELECTIliC PtlOJFCT
l-.tA.R 7 A 1 I" _" ,II ""0. ,
ECONOMIC ANALYSIS
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ALASKA POWER AUTHORITY
METLAKATlA POWER AND LIGHT
CHESTER LAKE HYOROElfCTRIC PROJFCT
~7 A f"Jr,INI f'f1INl; {(l"_,,PI\:'\.IV • MAn;,,~~ ~Q~;:::: ECONOMIC ANALYSIS -------------------
tell"' .... lf .... l 'f:l'~
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wftfwf"rt U'lf:I'NU~HY I~~~
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EXHIBIT 11
Page 4 of 9
ALASKA POWER AUTHORITY
ME HAKATlA POWER ANI) liGHT
CHESTER lAKE HYOROELECrRIC PHOJfCr
t.CONOMIC ANALYSIS __ ._~_ .. ___ .. _._ .. ___ ... _. ___ ~. ____ . ___ ._ .. ___ ._._.~._ . ..L._. __ ._ .. _
t fU"II"lr ."Al y~,:! '''. "" .. ,l' . :II~") EXHIBIT 17
''''l'"'''' "_'t: ft.""n t lit I , !;( al ., ,,,.. H a I' "' U.II;>" n I ~LI'U" I ".u; II."'U
HrHk, .. rt II''': "011"'" I""~ AU rll<;'~ III • Illun Page 5 of 9
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ALASKA POWER AUTHORITY
METlAKATlA POWEH AND LIGHT
CHESTfR LAKE HYDROElfCTflIC PIIOJfCT
LUAR~A .' J( .. ,f'",. t n,f""J[" I (H'v"j\ 'Af'J.-• """hl-lf ... l!=tH'
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MffEMfNCt UAlf,JANuAal Jill All CUIII IN I 10UO
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fllEO OtM OtM ntM OtM fUEL coaT PAEIENI
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EXHIBIT 11
Page 6 of 9
ALASKA POWER AUTHORITY
METLAKATLA POWER AND LIGHT
CHESTER LAKE HYDAOEll:C fAlC PROJECT
f(~nNnMtr A"IAI V~I~
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EXHIBIT 17
Page 7 of 9
ALASKA POWER AUTHORITY
METlAKATLA POWER ANO LIGHT
CHESTER LAKE HYOROflECTRIC pnOJECT
..... 1:COfl!n"'IC J'''I/\t YS1C ---'-'-
I ro"o"lr .N'l 'ats U.SMOj,lt .:IIII!>' EXHIBIT 17 '"flUlu .. R.tt. 11.111111 f III t rsr ..... ON M.If-II.U./'b OIS[OUN' HAlF; U.O'U HrtrMrHr[ 1J'1f :.I."UAH' I""" ·LL r "' I!' '111 • IIIUII Page 8 of 9 H'&;H SUN.HIO
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ALASKA POWER AUHiORITY
METLAKATLA POWER AND LIGHT
CHESTER LAKE HYDROElECTRIC PROJECT
ECONOMIC ANALYSIS
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.l~~11I "lL '5" ..... ',,, ',,, ' •• " :'IO~ '" • .!.. ''i,!__ ·UII". ___ ·.,IIUII ___ ·u".,'!1 ·u~~!" 'u",,"l ·V.,' flUne:' ,',,,,, ,II' '." ',.. ',.. 'UI '", '.", ·lOl....--.,-.,.., --.~., -. .. "It '00.1 I ·Vllu'iI----..-•• ""~ul'iilJl ..... [liil--DiioZ
~ .. [ ','11 ',u ·i .. 'ill '''1 'f" • .. II_·!I!" '"" • 'ill '.,..,. 'ull"II'uOOSI '0"'"' ·'h"~ ', .. ", ,,,ni
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5'nul 'U" '~5" 'n, ',,, •• " '"" ""? '"'''' ' .. " ·v.,,1t _ 'ull,," _ 'ull"SI 'U"I'l ·Ul.,., ·,l." (II III
,'U'" '"" '." ".i,.. '." '." ' •• " ·lOl--"V'''-·-''''---'.''''--·uii,r ---uftit(I-----oi1ili '0"11'2 ·ll'lIl llllJl---
"'1111 'U" ·.u '5" '", ',n .• " ',." . !.!!~ __ .!!~" ''!L __ ·o~",. __ ·,,~"'I '~1I~5~ ·U.,O, ·oh.;! ',lVL IIIIIC: •· •• "r i,." '." ., •• ' .. , '." '." '.0" 'II .......... "v--''ill -'-0"'. '"liil"'----OIl.(,---"-'iiIlC ·.".42 ·,I'O'---&'bl--•.•••• , '"" '0'. '." .". ',(, '." ',.11 'IOl '"''" ' .. " ·v,.. '00.11 'un"~1 'O"'l '0".' ',"t' '1t,,1 ," •• ,., '", •• ,., .", "ttl •• " '." ' •• ,. "01 '''''' ·~V ·06"t '.1,,11 ·.I,SI • ••• 61 ••••• , 'SDSI 0&',
,.,,.,, '"., '5!1t • It, .,,' '," .,,' "~!!' .~~~ ·5_" __ ·u~" ___ '!I!,! I ____ '~~"C;I ''''''l ' •• ,,, '., .. " "'''' '·n." ',r" .,., ' .. , '.. '''I ' .. , ' •• " IO~"""~" "'u, .. 1' ..... "" '".i;, ...... ;! "olin ·'~'i"'--
,,'llnl 'nll~lI '5" 'iL ',(1 .,,' ••• ~ ... _ '"~,, ... ., ·.II~i' ',,0,," ·UII.SI 'O",I( 'Ol"'l 'uflt ~,,'"
,'." .. '"'' 'Ul "'" '" '''1 •• " ·.i" ·,ijJ-l.fi.-·~Ii---·u(il----.. uoitn --'uniSI--ifiljl--"ilU"r-"lnr-IIu'
Z·, •• " '"" .," '", ',. "'1 •• ,' '"" .,>, '., • ., .~., 'O'i!ol 'uO"II 'OOOSI 'Oli!o'l ·O •• I~ ·"A... r,,"1 cu." 'u" '." i Ul in '." 'Ill' 'u" "'!of ,,,~,, '«:e ·..,.r-----'.Tolr-"tn"lil "OInt 'OUr2 ·OIU" In,
l·...u~II·U ·IL,·" 'U~i' '.,,, 't!oJ .,,~,, __ .~ __ '~I" __ ·uollll 'un~lil ·01,,"l 'UItUc: 'O'iL" I"",
.·li.'. IF(I '" •• .,.. '." "' ."........--.0'1 --..,... ''iV --Ott I --'ullull---'-oiloltl~ltFI2----rdfl~"'--h'"
l~~tlL~t __ ":'!.f '~t(_1_ "1.L ·~!!._·o" ___ ,,,~,,_ .... ., __ '" __ __ 'uftlll • Ul',," I 'OftC;;! 'uHi'~ 't;>!o" " .... , ,·r." ,.,,'. ..,,----. If' ..... lI ---, .... "/19 '.,." --. .. ., 'u-"uhlll -'ullll;l---"'{~T ---iiUl'c "l;rIt"---IIU'" ,',.5' 'if'I" '"e'o "1' 'Ii' ·llt.' '0. '"'''' ·~V 'u _ ·u".,,, 'un"lil 'u~""l ·u".,'i ·ul,.. ,.,,,,
,'"., ',,, '. ·.u '. "., ·6(1 ·llll·Att ',,611 "<" • ., ----O-fi1I ·,nOIi' DInt OllllZ 8hZ. .U"'--
l'~iiL~iM-:'t~t}-'~u." '!~-, '~~I .~! ___ ·O ____ • .. V __ ·u .. Uf> _·u _ _ ·uIIU .. 1 _ 'o"o"t ·ui' .. 111 '''''1'' C;II'"
S·.", •• l' l'it l" -rl" i. ·."------li .......... O. -0 "I;., "vitLI " " -'ullllt;1 "o .. tl'Z---·Dl{n-~blllSUf,f
J·_!U.~ill....:.J't~i'( 'U' '. __ ' .. " '~t1 '11. '0 ' .. ., • V ... ., 'v ·unu... 'Ui',Ii 'ur~1I1 ·Dr." f,,"' •. ," .... ·,h .,tl"(~ ~I(-,--"C.i' -'it ---"o------T';.,----'ulllt; "0-'unut;j----"uill""---~ulljll--Ob"u-';-",U'"
H1MO. 'CU) 'CO) 'CU] lCU] lCn) lCU,---a~OJ
.1JlJIJlttL.,uuL Hnl "+U _I!~'" _ .. !~ ___ ... ~ ulaq_ OJrH
"nMn) '1101 'J.JI011IUl 'JCjIO'ld'OANlld'UAN 11,0, 11~Jl0
(H .... I ( ...... I IH .... ' (II .... ' '''M'') ".)0)
1 ruJJ ~lfTIv jiJii i~f 1r]1IR .ft4 J'I n J , ,H jlJ l'l-"lTl'-lfJN ]!1
,,1.IJ n~'1 i l:JII'UJ l:JHJ'1j l:JH.fN.f l:J".fJlJ
fM'''Alilld'''lH 'J<:jlu [1d·Ul,' Ild'''lH "1111
".1., .1111" H.fHd l.I~u"l.ff;
flIH.,.1 Jlb II-'Ilf
y."" JO
A 'III 1 .. 1
u"VWjll ",lA
'oIvlcl
UIIUI •• '. "HIIJ 11'-------------;i"i.-.-pivi' •• vr=HV" .,jilllf itJJJ----------
n\n·o =.:U.'t 11.lIu·I~lu ~(O·O =,;J'VJt '·II.,tI"J~," IllIf ul\u·o =ItUd hflll,t.:t".
-f.",!;,. h,t,. JI~III""J'
EXHIBIT 18
,.--,."
i ,." 1500-r---------------------------------------------,.~_~~--------~
J.
1 ,.
J,." ! ..". ,. ,. ..". ..". ,. ,
.-.."."'" \.. "--ELECTRIC HEAT
-r------------~~~----~--------------~---------------~-----t-_~ .... ~ ..... ..".--trtl-"--FUEL OIL·Y . ..". ..".
••••••.•••.•.••••.•...•••.•....•..••••••••••••.....••.•.••.•.•••...••...........•.....•.......
1000 ;-------~ WOOD S120' CORD
-
-------------------------~ ~-.. -
_._._._-----_._._._---_._._._._._._._--
"--WOOD 570/ CORD
500-+-----~-
-
:
I
0 I
I
1981 1985 1990 1995
YEAR
1/ 2.6% FUEL ESCALATION RATE
ALASKA POWER AUTHORITY
METLAKLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
ECONOMIC COST OF HEATING ENERGY
~
4C
EXHIBIT 19
Page , 0 f 4
30~-----r----------~----------~------~~~---------J
I
I ~BASE CASE
~ < EL. 845, i.5.MW \ / ~ I / z I / / ~ I ~ C; ,
> ,," ••••
C; 20r-------~----------~----------~------------~~~~~~··~ c: J' "" •• ' z /'/'. ....... . ... / /: ....
C // < .....•
~ "" •••• I
c: " .'
;" .~' ""'" c··-···········~7···· : .",
.~..", ,
I
E L. 885: 2.5 MW
:.................... I ~ <tIfII' '
'OJ---~~!!~----~~~y7-~--------~--------~--------~
__ oJ'!
845, 2.5 MW
~9:8:2-----:'9:8~5----------~'9~9~O-----------'-9-~------------2-0~OO------------2JOO~
YEAR
,r..o REVENUE BONDS
MOST LIKELY SCENARIO OF LOAD GROWTH ALASKA ~OWE R AUTHOI=l I T'r
METLAKTLA F'OWeR AND LIGH~
CHESTER LAKE HYDROELECTRIC ~ROJECi
COST OF ENERGY GENERATIO~
~UF'l~_E L.o.K.E C'"ES'7E~ _.0.0<::
.o.NC, ",IESE~
40
I
EXHIBIT 19
Page 2 of 4
/ -30r------r-----------+-----------+--------~~----------~ .I:
~
~ -en
~
Z
"" U
z i I~~SECASE
~ 20 ~ ~~ ffi r-----,---------~--------~q----------+-------~~/~~
~ /'~ ~ EL. 845; 1.5 MW\ ~ •
~ \ ~ ..... . ~ ;~ ...... .
u I // .' // ....
/. .' /;
// ........ .
/ ~ ....
~ .'
10 r-----tv---~~-+-I'-J. ~-·--·-·V""-~-tt.-":::-··~:~··~,j.:"~··-::·'--.... ·~··-·-E-L.-B-B-5-.. 2.~5f----M-W------1
~ .................... :.~I \ .!.._------, \.... ~ -EL. 845; 2.5 MW
~ --
o~ ____ ~ __________ ~ __________ ~ __________ ~--------~
1982 1985 1990 1995 2000 2005
YEAR
5% LOAN
MOST LIKELY SCENARIO OF LOAD GROWTH ALASKA POWER AUTHOPITY
METLAKTLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
COST OF ENERGY GENERATION
PURPLE LAKE, CHESTER LAK:
AND DIESEL
-.J:
it :.::: -en
~ z
~ u
z c
~ < cr
Ij"j z
~ c.:
> c.;
cr
~ z .... ...
C
~
lr-e
(.,;
40
30
20
EL.
EXHIBIT 19
Page 3 oi 4
BASE CASE
'Or-------~------~~~------------~~~~~----~----------~
885 2.5 MW
-'-.
EL. 845; 2.5 MW
~9~8~2----~'9~8~5------------'99~0------------'99~5------------20~OO-------------J200:
YEAR
5% RA TE OF RETURN
MOST LIKEL Y SCENARIO OF LOAD GROWTH ALASKA POWER AUTHORI-Y
METLAKTLA POWER AND LlGH~
CHESTER LAKE HYDROELECTRIC PROJEC~
COST OF ENERGY GENERATIOr-...
~uRP~E "Ao<E CHE5~:;:; ~.:..,,~
Ar-;:: ~IESc_
:c
~
:II: -en
~ z w
(,,)
Z
0
i= c a:
w z w
c"
>
c" a:
w
Z w
'" 0
~ en
0
(,,)
40
EXHIBIT 19
Page 4 of 4
30r------t----------~------------~--------~+-----------J
EI. 845; 1.5MW
20
,.y~ ~ .. •• ••
10
:.~2----~1~~~----------~-----------1~~-----------~~----------~2005
5%'13% COMBINED RATE
MOST LIKELY SCENARIO
OF LOAD GROWTH
YEAR
ALASKA POWER AUTHORITY
te1ETLAKTLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJEC-'
COST OF ENERGY GENERATION
ftURPLE LAKE. CHESTER LAKE.
AND DIESEL
..
C
l-
V.
C ...
EXHIBI1 2C
Page' 0' .:
30r-----~----------~------------~----------~----~--~
BASE CASE
20r------t------------------------r---~~----~--------~
f EI. ses. 2.5~~ ••
...... ..... .. -.. -.-.. .",.
. ...... \
I
•••••.••• •••••••• ... ~
••• i .J ...... ....::.----
Ei. 845: '.5MW~:..· ! ___ ............ 'J
••••••••••••••••• ··1 ~, ---I ~ I'
!i , :/ -'-i'-EI. 84S 2.5M" t ,----, I ,0r----7~==~-~--_+t_--------+---------~--------~
~.~2------'.~8-S-----------,-I9~O-----------,-"~S------------~~oo------.......... --.J20C:
YEA~
'2"~ REVENUE BONOS
LOW SCENARIO OF LOAD GROWTH ALASKA POWE~ AUTHORiT,\,
M£TLAKTLA POWER ANC LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
COST OF ENE RGY GENE RA ilO~
PUFlP~E .. AKe.. CI-4ES"I"El:; LAKE
Allie DIESE~
3 0
! 20
j: c =:
!AI
Z w
t:l
> t:l =:
w
Z
!AI
~ o ... en o
u 10
~ • .. ~
V
/
If··········· •••••• .. :;-----Lo-' _-,~ f/,' •••••••• ---~ ~ -
BASE CASE _____
V
r-EI. 885; 2.5MW ...... . .........• ~ ----4
EI. 845; 2.5MW
EXHIBIT 20
Page 2 of 4
/
-:;,if ...
•• :.;,;;,;~ j /e •• .:.;.,.....
EI. 845; 1.5MW-
o
1982 1985 1190 1995 2000 2005
YEAR
5% LOAN
LOW SCENARIO OF LOAD GROWTH ALASKA POWER AUTHORITY
METLAKTLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
COST OF ENERGY GENERATION
PURPLE LAKE, CMESTER LAKE
AND DIESEL
-.
II)
~
Z
u.i
U
40
EXHIBIT 20
Page 3 of 4
30r-------r-----------~----------_+------------+_----~----~
BASE CASE
Z o 20r-------r------------+------------4-----~~--~------------~
~ «
" u.i
Z ~ I.
>
c.:l
" u.i
Z
u.i
U. o
~
II) o u 10r-----~------------~~---------+------------~----------~ r EI 885; 2.SMW ;joII' .... --J .............. · -----..."" l ................ ..... -,-
•• , - -- - _ -" EI. 845; 1.5MW .................. ~~ -\l!:-:
_ - -""/ EI. 845; 2.5MW '
o~ ____ ~ ____________ ~ __________ ~ ____________ ~ __________ ~
1982 1985 1995 2005 1990
YEAR
5% RATE OF RETURN
LOW SCENARIO OF LOAD GROWTH
2000
ALASKA POWER AUTHORITY
METLAKTLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
COST OF ENERGY GENERATION
PURPLE LAKE. CHESTER LAKE
AND DIESEL
I
40
EXHIBIT 20
Page 4 of 4
30r------t----------~r_----------+_----------~----~----~
BASE CASE
! 20r-----r---------~--------~--~~--+_------~
i= c c:c
'" Z
'" c:J
> c:J c:c
'" Z
'" ~ o
I-m o
<.J
EI. 885; 2.SMW
EI. 845; 1.5MW ........ .,-----~ ...................
10r---~·r_----~~~~~ __ ~--L~~=---+-------~
EI. 845; 2.5MW
:.-~2----~1~9~85~---------1~9~90-----------1-99~5-----------~~OO----------~2005
YEAR
5'10/13% COMBINED RATE
LOW SCENARIO OF LOAD GROWTH ALASKA rO\'V.ER AUTHORITY
METLAKTLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
COST OF ENERGY GENERATION
PURPLE LAKE, CHESTER LAKE
AND DIESEL
EXHIBIT 2i
4Ur-______ ~--------------------jr--~.----------------------~P~a~9~e-'~O~;~4
/
. , ----J--_ .
~~ J.'
. ,
.
/\
.I ~ DIESEL 2.5 MW
I
I •••• I ; 30j----~I~·~··----~------~I------~------~
I ........' I
I :J<'/ I ; /., '. TOTAL DIESEL COMPONENT OF: BASE CASE
If'... r·.. I :
I I ...... ~ I ••••• r EL.. 885: 2.5 MW i
II z(li ..... / I i ••••••• :~ ~./' : ........ l-..... :::t::: ...... ;;;:;::::::p.::;:..--
~ ~ ;: EL.. 845; 1.5 MW .. 1.0 MW@'PURPLE L_AKE ~
, / ...... , :---20r------?~--~~~~------------------~--~~~~~~ ~ --, ~ __ I _ ..
I ~ ~----.., --' I, _--, -""\---,-----~ ,
~.! . EL. 845. 2.5 MW
EL. 845; 1.5 MW
,
;
I
I I
i
I
10
I ;
I !
I , I
i ! ,
I !
i I ,
i
12'"..0 REVENUE BONDS
MOST L.IKELY SCENARIO OF LOAD GROWTH ALASKA POWER AUT~·40RITY
METLAKTLA POWER AND LIGHT
CHESTER LAKE HYD~OELECTR1C PROJE:~
COST OF ENERGY GENERATIO~
~ • ~ -CIt ...
Z
"" to)
Z
0
i=
c(
c:
"" z
"" CI
>
CI c:
"" Z
IoU
~
0 ...
CIt
0
U
30
20
10
o
1982
5% LOAN
.I
I .. /J
?
.'
I • I .
I
I •
,,/'''--DIESEL 2.5_
EXHI BIT 21
Page 2 of 4
I ~ TOTAL DIESEL COMPONENT OF BASE CASE
• /
~.
I
1
IEL. 885; ~.5 MW EL. 845: 1.5 MW + 1.0 MW A @ PURPLE LAKE
..... ......
~ ..... ~~
.. ---..: l~ ~~
•••• • ...... 4'11 .... I"'"" ~ ...... ;.;. ........... ~ ~-~ --I-~-.. ~--1..--_---.. --L -t--..... __ --. ~-l E L. 845; 2.5 MW
EL. 845; 1.5 MW
1985 1990 1995 2000 2005
YEAR
MOST LIKELY SCENARIO OF LOAD UROWTH
ALASKA POWER AUTHORITY
METLAKTLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
COST OF ENERGY GENERATION
CHESTE~ lAKE ONlY
. I
i / i
I . :
/ i
I .
I / i I
I ; J
I' I
'\ I J.i L DIE~EL 2.5 MW
i.l I
EXHIBIT 21
Page 3 ot A
~~----~--------~~--------+----------t--------~ i : ,V
¥ --CI)
~
Z
~
(,,)
z
I
I
I
~ ! // \! I : ~ 1./· "--T~TAL DIESEL COMPONENT OF BASE CASE
~ r i i : G 20~------~~----------~------------~------------r-!-----------1 ~ r ! I I z
~
~ o
~
III
C
(,,)
I
I I ,
I
I I
I !
I I : I I I
I ;-EL. 885; ~5 MW I i
I I
I f......... Y E L. 845: 1.5 MW ... 1.0 MW
I Vi PURPLE LAKE I , .....
10 ~---~;~-::,.:--.-.:.::!.:.L-...,.;::_ ... -:,L._ •• _-----:I-------T""\ ------1
V
' ..... 1 ----'-...••• I : ..... ..." ..... I __ .:.r~".nn ...... ~ n.sR7n'n ......... .....-::.MoIo~~
Yr-~-: i
I --~ I __
I ------r-I-~ ___ =I------I I I
I ! I I
L ~L. 845; 1.5 MW L I
EL. 845; 2.5 MW I
I I
I I •
0 i
'982 1985 '990 '995 2000 200::
YEAR
5% RATE OF RETURN
MOST LIKELY SCENARIO OF LOAD GROWTH
ALASKA POWER AUTHORITY
METLAKTLA POW-ER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
COST OF ENERGY GENERATION
40 ( 7 .
I •
EXHIBIT 21
Page 4 of 4
/' TOTAL DIESEL COMPONENT OF BASE CASE
I ..
I • I • ~ DIESEL 2.5MW
I -3or------r----------~----------~---------+----------~
I
/-••• I
. ,...... .... . .......... .
/_ ..........-EI. 845; 1.5M
l
W + 1.OMW • PUFFLE LAKE /-~.. ..... r EI. 885; 2.5MW
I
-. . ..... . Z -. •••••• ~ o 2O~------~~~----~~~~~.--------.~.~ .. ~.~.~.~ .. ~.~.~ .. ~.~ .. -.-.----+---~~.~~~~ ~ K, --~. --=-..... ~-E-I."""84-5::::: ---
~ .......... ~ i ,. ~ __ ----
~ .........,..., ----~ -----
Ij,j .......... , ...... --_ ... -
Z 1-..... ,~_--
Ij,j ..... _--~ 4--EI. 845; 1.5MW
en o
(.) 10r------t-----------t----------~----------~----------~
~.·~2-----'~9~8~5-----------199~O-----------'-99~5-----------~~-----------2~OO5
YEAR
5%/13% COMBINED RATE
MOST LIKELY SCENARIO OF LOAD GROWTH ALASKA POWER AUTHORITY
METLAKTLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
COST OF ENERGY GENERATION
CHESTER LAKE ONLY
so
,
I ,
I
i ' V~ 01 ESE L 2.5M'I. ". '. -'. -.
,I
•••• 1 /1 •••• , I
-+---------... f-or~·--.. -.. ----I -{OITAL OIESEL COMP~NENT
EXHIBIT 22
Page , of 4
I / OF BASE CASE
~~--~------~--4"~~~~1------~------~ Ie. j,-, ,--ii ······1 .... ~~ .. ~5 2.5MW
. . ..
, ... . .....
~ , .~ .• --------.~.ft._ I": .......... .
~.: 845: 1.5MW + 1.0MW ~ PURPLE LAKE
t .......
~ 30r-------~+---~~~~~~--------~1---~~~------~~~~~ I ~
< :: ....
Z ....
c.::
>
~ :: .... z ....
.... o
~
III
C
U
I
'" '" "~El. 845; 2.SMW '" ' '" '" ' " -"' ..... , "----------..... ,_-......_ ... -
I
!L-El. 845; 1.5MW
20r-----~--~--------------------~----------------------~
10 19~8~2----~'9~8~5------------'9~9-0-----------1-9~9-5-----------2-0~OO----------~200:
VEAR
12"10 REVENUE BONOS
LOW SCENARIO OF LOAO GROWTH ALASKA POWER AUTHOR~T'I
METLAKTLA POWER AND LIGH~
CHESTER LAKE HVOROELECTRIC PROJEC;'
COST OF ENERGY GENERATIOI\
z o
~ « cr .... z ....
" >
" cr .... z ....
~ o
~
II) o u
40
• I • I
,:,--DIESEL 2.5MW
EXHIBIT 22
Page 2 of 4
~ --~------1I----.i-. --~ --~ ----.-----------1
• ,
TOTAL DIESEL COMPONENT OF BASE CASE
• I • 30~----7-n----
20
• I • I • I •
• /--~6--_-------+--
I • ~ ... ..... EI. "5; 1.5MW + 1.OMW @ PURPLE LAKE ..... L EI. 885; 2.5MW •• ••
-+-f.---•••• -...-;:--. ...... . .... .... . .... ...... . ..... ........ --~
'. • ____ EI. 845; 2.SMW --____ _
,---...--~ -~~ ..... ------~ ~~------~I~--~··~·~~ -----+--~--~=--~ I I --1 --~ ~ -~ I ......... .... -~...-"'-
, .... _---_...-
EI. "5; 1.5MW
10r-----~~----------~-----------------
~9~8-2------19~8~5-----------1-9~9-0------------~-----------2~0-OO----------~2005
YEAR
5'1 LOAN
LOW S :ENARIO OF LOAD GROWTH ALASKA POWER AUTHORITY
METLAKTLA POWER ANO LIGHT
CHESTER LAKE HYOROELECTRIC PROJECT
COST OF ENE RGY GENE RATION
CHESTER LAKE ONLY
-~
!t
~ -CII
~
Z w
Co)
Z
0
~ < a: ...
Z ...
" >
" a: w
Z ... ...
0
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40
.J f
" 30
I • I • / I • / •
./
~.
20 V
. •.•....•• ..•.•.....
r----......
10
T--_ 11-----;: r ,
I • I • I •
EXHIBIT 22
Page 3 of 4
~ DIESEL 2.5MW
I·
." V TOTAL DtE,EL COMf'ONENT 0 ~ BASE CASE
•• ,......-EI. 845; 1.5MW + 1.OMW • PURPLE LAKE
--.. -. •• -. I -.. "-EI. 885; 2.5MW ~-.--.. ,~ . ...... -~ ......
~-~ -.. ... ~ ............... -..
1'::-........ --.---~.::::::-... -... ~ ~ EI. 845; 2.5MW -,
r--EI. 845; 1.5MW
1'-_---_ __ --1-------
o
1982 1985 1990 1995 2000 2005
YEAR
5% RATE OF RETURN
LOW SCENARIO OF LOAD GROWTH ALASkA POWER AUTHORITY
METLAKTLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
COST OF ENERGY GENERATION
CHESTER \.AKE ON\. Y
40
EXHIBIT 22
Page 4 of 4 ...... ,. 1
••••
••••••••• f.. r ..,-I.·TOTAL DIESEL CQMPONEN OF BASE CASE
t
t
-.,,,,:. I
--. ... DIESEL 2.5MW r~-
•
.&: .. ~ "1-'-'~ ----......---~ 11/ .... __ ' __ --.. Ir-EI. 1N5; 2.5MW .
~ t --'~~' ~ (.) ./ ',1'---.. ~-~ ~ 20r-----~~rl~~------~------'--,~.~~.d---~--~~~-~_+-----------~ ~ V -I-' .--1------
~ EI. 1N5; 1.5MW
>
C-' a: w z w
~ o
~ en o
(.) 10r-----~------------~----------_+------------+_----------~
o~ ____ ~ __________ ~ __________ ~ __________ ~ ________ ~
1982 1985 1990
YEAR
5%/13'% COMBINED RATE
LOW SCENARIO OF LOAD GROWTH
1995 2000 2005
ALASKA POWER AUTHORITY
METLAKTLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
COST OF ENERGY GENERATION
CHESTER LAKE ONLY
FUEL OIL; I
-~ ~T-----------~~--------------~--~~~-------J
fit
~ S ~1r------------~~------~~~~~~~------------:'~~
y .~
> .,~ o ~., • « ~ •
~ .~" o ,~
z ~1-----------~~~~~~----~~~~------------~
~ c
"" :t
..I
C
--WOOD S110ICORD!!
~ ~ 1~1r----------~r--r~~---------------+------------~~·~~~·J
Q ~ .~.
~ .~ « .-'
..I .-' ~ • -' -'~ WOOD SlOt CORD tl z ~.-'
! '~ir---------------r--------~~~~-----+-------------------J .... ., .
.."". . .,.,.. .
.."". . ..""..
. .,.,.. . .."". .
~1-----------~--------------~--------------~
o~----------~------------~------------J
'111 '16
ftAR
NOTES:
11 1981 PRICE LEVEL. ",. INFLATION RATE
Y 1981 PRICE LEVEL. ",. INFLATION RATE
• 2.8% FUEL ESCALATION RATE
LEGEND-ELECTRIC HEAT
1W5
EXHIBIT 23
1~ REV. BONDS
•••••••••••••••••••• 5%/1~ CCWBINED RATE
------K LOAN
- - - -K RATE OF RETURN
ALASKA POWER AUTHORITV
METLAKLA POWER AND LIGHT
ANNUAL COST OF HEATING ENERGY
MOST LIKELY SCENARIO OF LOAD GROWTH
EXHIBIT 24 ~.-----------~----------------~------------~ I FUEL~'~_
3000;---------------+---------~~~~~----~~/~--------~ ~ ............... .
tit
en
I-en 2500 0
(,)
> t.:l c:
"'" z
"'" t.:l
Z 2000
~ cs:
"'" %:
~ cs:
~
Z 1500 "'" Q
in w c:
~ cs:
:l
Z
Z 1000 cs:
.". . .". . .". .
.". . . .". . .". .
.". .
..
I
... ... .....
WOOD
S120/CORD 11
".
". ". ".
." .
". ~WOOD S70/CORD 1/
500~---------------+-------------------+------------------~
o;-------------+---------------~--------------~ 1981 1985
YEAR
NOTES:
11 1981 PRICE LEVEL 81 7% INFLATION RATE
Y 1981 PRICE LEVEL 81 7% INFLATION RATE
81 2.6% FUEL ESCALATION RATE
LEGEND-ELECTRIC HEAT
---12% REV. BONDS
.................... 5%/13% COMBINED RATE
------5% LOAN
- - - -5% RATE OF RETURN
1990 1995
ALASKA POWER AUTHORITY
METLAKLA POWER AND LIGHT
ANNUAL COST OF HEATING ENERGY
LOW SCENARIO OF LOAD GROWTH
[ "%i ~
r :/~
\>\1
[ '" ",V;-
/ r /
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I
ENGINEERING C;::OMPANY· ,
,._-... -
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-~.---
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/
.L EXHIBIT 25
ALASKA POWER AUTHORITY
METLAKATLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
GENERAL MAP
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PORT CHESTER
CHESTER LAKE
\J ...... 2-15 . .3
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FI.O· Mun 1"",1' /0" "~,,,. (Af~('r)
_ HARZA ENGINEERING COMPANY JANUARY 1982
EXHIBIT 26
ALASKA POWER AUTHORITY
METLAKATLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
GENERAL PLAN
....
!.II
!.II
M:; •• NI>I'm:11
tfl(El8IW} 1,/"-900
~ ~-~ 'lB2?'jr
/~, 1 ,. ' ~~
BOO
700
600
500
.,. 400
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300
200
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0+00
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HARZA ENGINEERING COMPANY JANUARY 1982
'~ " --, i~ ~.~ r--,.,~
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5+00
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PROFILE ALONG \. PENSTOCK
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20+00
EXHIBIT2.7
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be v:;;llon lint! l{~i --
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Jl>/uIn a 0,. /J(sII ""..,./&r ~/'" (JliUr)
ALASKA POWER AUTHORITY.
METLAKATLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
GENERAL PROFIL~
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COMPANY ENGINEE_~R~IN~G~ ______________________ __ HARZA _ JANUARY 1982
\
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(NLLIY)
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10 SCALE ~~_~-"-_~_ 30 20 40 50 , 60 FEET
R AUTHORITY ALASKA POWE ER AND LIGHT
TLA POW
METLAKA TRIC PROJECT
HYDROELEC E R LAKE
CHEST WAY
DAM AND SPILL
PLAN
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900
890
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840
830
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STATIONS 0+00
HARZA ENGINEERING COMPANY JANUARY 1982
3'-0'
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SECTION THR(J INTAKE
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UPSTREAM ELEVATION
.,.,
// /
/ '" /
EXHIBIT 29
_c ....
~f7chors
SCALE 0 10 20 30 40 50 60 fEET
2+00
ALASKA POWER AUTHORITY
METLAKATLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
DAM AND SPILLWAY
ELEVATION AND SECTIONS
[
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(£lrctfYC~1 ~quipfT>ffl'noI'fI_")
HARZA ENGINEERING COMPANY JANUARY 1962
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SCALE 0 10 15
ALASKA POWER AUTHORITY
METLAKA TLA POWER AND LIGHT
~o FEET
CHESTER LAK~ HYDROELECTRIC PROJECT
POWERHOUSE
PLAN & SEcnONS
...
. ~.
.---------------------.
12.5 KV.~¢li"e • ~ ______________ '2~ KV • .3¢ti,"
To fVpW LdbH~""'f----------------:llI I i.~ -To' Ale/14k .. fl ..
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7.2KV,I¢ Line
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(Nore i)
6e",,..,tor ~ $flfion Srrvirtt
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... ......... --q'n~r.,tor-------------------
(Nortt 2)
r;ttnttr#1br lWufrdll !if'OUf>ding
Eyu'P"'W>f·--------------~
HARZA ENGINEERING COMPANY DECEMBER 1981
600 -5,1,
(~f) __
'~~rAGE
"" I REGULA rOR
... "" ,... f._a
r 277'UOj4'OV
t¢,60H.
ro
Lig!;fing 1' .. 1111
______ --...1
II\--
EXHIBIT 31
SYMBOLS
[) Oil Cir",d 6r,~J<e"
~) y Air or V.cUUIII Circuit ~' •• Jc.r
A Disconn.ctin!! Dttvice
I Di$C<,nMcfing S.,itch, Non' F",od Type (
* C~ble Tum/Nt",n
2 Redi,i,r
...u..v Tr~n~/Qrmer rvr"
~ R.,~dor
$-CurlY"t rr~",kr"''''
-3 E-!'bt",t;.1 rr~II3'ormer
~ M~M.tlc O."rlo.<I Devic.
~ n,.,.",.1 OrttrJo.<I DItV~
.-t Sur 9· Arnst-r
-H-Dlp«itor • Fixed
--0-Fus.
I
f DiscQnneding Switch, Fuu TYI>«
.. Grol./na
t BU.5/"-"g mo<JI7f«l currrnf f,."",s(br_r
ilJ( Di"connitcting :Jwi1ch, Lo6d-Br#dK TIIP-
( Fusltcl cuf-our
AKJTFS:
I Insrrumenf frtl"slbrm~,. 9t'""tif/ •• dnd r.t/05 }b be .. n(j(.lIrrd
by fh, m .. rwf'~ctvru of' th~ VoIt~flit l?~fl<J/dfo",
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.ttlKfPcI hf~r fo mlfch The ITWntAc1'vrrrs 1vrbi,.,. oufp<lf.
ALASKA POWER AUTHORITY
METLAKATLA POWER AND L~HT
CHESTER LAKE HYDROELECTRIC PROJECT
ONE LINE DIAGRAM
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~--------------------------------------, EXHIBIT 33
DESCRIPTION ~1982 1983 1984 1985
_______ . ____ ~_~~,:M;A~~~t\~.O~N-DJ-f M.A_:M J Jf ;~IINl~ J~'~~-~IJ J·A-r~ O!N;D-~-F~~~~~~-~~~r~b
1 1 ' '! ,-1 ! I I! I
PREPARE I BID' AWARD ! .: I i I ; I " _ 'i ~: I
.. ---,--~-'--=i;I~I~,~;-l~-----., --r-------+-I I ! ' i I i .-~ -------7"-1'-!' 1 I ' -; -r-!f.--l-i
, i I !--:-!-:~7 .. i-:-~, _,I!' ~ : ~'H--.L--;~+ f-1--' .~~ -,--l-':I+i-
I
,-
___ I ~;~P~RE ' __ 6.10: ..P-'!i.~ 0 __ .. -"-_L. i, !..L I I ' !! : 1 I ' , "T ~
CON S T R U C TI 0 NCO N T RAe T DOC U MEN T S : .... 1 ""'~III1", A ; , I ; 'i: I ,-~---1, I. i; : ~--__ -_--~~.o~ __ ~-I~_liA~tO~'---.-----------------------.~-~-J~TT I-~.: ' : \ ; -1 .~ :--; ~--:--t ' i !: I ~I :1 ! : : t ,-~t r
DAM E X C A V A T ION &. G R 0 UTI N G ,-Sf : C. I I JIiiiIIaD i i
--. ___ --?'A M--~-O~-S-T-R-U-C-TI-O-_~---~~-N_? ~;-~~-~ S~---.---, __ ~r-, f: i '~-:: ;':-T -~rl-H;l; ':' I: :I! I : i !
PENSTOCK FABRICATION i : :' : 1 ; , I i ,! ;! I I i I !: ! I I i I : i ,j I , _________ . ____ ------f---. ------+-. i---1--------l---l--
_. __ -._L ____ --,-----, -!~---j-T-I ~T ~ __ s:: _ ~_; ;: !!: t +
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:: :: Ii,;'; j , -: : -~ ! ~n: :: ,-':r i ; ! i : I !
-------.---,-----.----,--.'--,._----
EQUiPMENT CONTRACT DOCUMENTS
------------------------.--------._-------------
PENSTOCK INSTALLATION
(----------. -
POWERHOUSE EXCAVATION
1----------~-----. ---------.--
POWERHOUSE CONCRETE
--~---~ .... --~,<,
A C C,E S S, R 0 AD , -,
EQUIPMENT MANUFA'CTURING
i .i ."
: I.~
E QUI P MEN TIN S TAL L A T tON,
I I-
I
TRANSMISSION LINE
EQUIPMENT TESTING
FINAL CLEAN-UP &. DEMOBrLIZATION
ENGINEERING STARTED MARCH I. 1982 ALASKA POWER AUTHORITY
METLAKATLA POWER AND LIGHT
.CHESTER LAKE HYDROELECTRIC PROJECT
HARZA ENGINEERING COMPA NY JANUARY. 1982 DESIGN AND CONSTRUCTION SCHEDULE
APPENDIX A
GEOLOGY OF FOUNDATIONS
AND
CONSTRUCTION MATERIALS
I
p~
AnL
areC.
neerl
Appendix A
GEOLOGY OF FOUNDATIONS AND CONSTRUCTION MATERIALS
~ologic investigations of the Chester Lake Project were
J out during November and early December 1981 in order to
and supplement previous studies, to investigate founda-
)nditions and construction materials, and to assist in
inary layouts and cost estimates.
he engineering geology considerations significant to the
cal feasibility and cost estimates of the proposed civil
ures are described below.
us Stud ies
he geology of Annette Island has been studied previously:
major work being done by the U.S. Geological Survey
." the Geologic Map of Annette Island (Berg, 1972).
wi th e .....
hazards",
Jment on engineering geology and seismicity of the
.blished in 1977 and is entitled "Reconnaissance Engi-
Jlogy of the Metlakatla Area, Annette Island, Alaska,
Isis on evaluation of earthquakes and other geologic
by L. A. Yehle, USGS.
Previous geologic studies for the development of hydroelec-
tr ic genera t ion from Chester Lake were cond ucted by Robert ~~.
Retherford Associates, Definite profect Report, Chester Lake ~
droelectric Project (1977). Many 0 the geologic findings pre-
sented in the Deflnite Project Report are confirmed and ex~anded
upon in this present study.
Geologic Investigations 1981
Drilling Program. An exploratory drilling program was con-
ducted during November and December 1981 (November 9 to December
12) by a two man crew using a portable Winkie drill (drilling
contractor Salisbury & Dietz Inc.) under the direction of a
field geologist. Geologic logs and water pressure tests of the
drill holes are included as Annex A. The drilling program in-
cluded 560 feet of drilling in 11 holes to determine the thick-
ness and nature of overburden materials, the quality and ext~nt II
of weathering of foundation rock and to obtain samples for lab-
oratory testing. Seven holes were drilled along the proposed
Chester Lake darn axis, two holes were drilled along the penstock
alignment and one hole was drilled at each of two alternative
powerhouse locations (Exhibit A-l). Water pressure testing was
performed on drill holes in the dam foundation to determine
permeability of the rock for evaluation of seepage control meas-
ures. Water pressure tests were also performed to determine the
A-l
depth of open jointing. for evaluation of anchorage J
rnents.
Geologic Mapping. Reconnaissance level geolog.
was conducted in the general project area. More de1 lo-
gic mapping was conducted at the damsite, along the
route and at the powerhouse. U.S.G.S. topography, t
1:10,000 scale, was utilized for plotting geologic:
within the general project area. Field sketch maps
for plotting geologic features at specific structurE
the data were later transferred to surveyed base ~al
became available. Geologic mapping included measurt
jointing and foliation to evaluate rock stability.
and quality, and the extent and depth of overburden
also were mapped to provide information for engineeJ ~
estimates. Rock samples were collected for petrographic exami-
nation for use as concrete aggregate during the design phase.
It is anticipated that some additional work will be re-
quired on site at the design stage to field check the plotting
of data. This work also will include more detailed mapping
that was not completed during the field period due to snow and
ice cover.
Regional Geology
. .
Southeastern Alaska is typified by interconnected mountain
ranges, often partially subnerged, which have undergone several
episodes of folding, faulting and igneous intrusion resulting in
extremely complex geology.
Annette Island is typified by rugged mountainous terrain of
moderately high relief rising to 3600 feet on Tamgas Mountain.
The Metlakatla Peninsula is a large area of low relief.
The main body of Annette Island is composed of a complex
granitic intrusive called the Annette pluton. The Annette plut-
on is of Silurian age (+416 million years) and is surrounded by
a fringe of predominantly low grade metamorphosed volcanics and
sediments ranging in age from Silurian or older to Jurassic.
The Metlakatla Peninsula consists of low and medium grade meta-
morphosed volcaniclastic and pelitic sediments of Silurian age
or older. These metasediments have been intruded in several
areas by igneous rocks which may be similar in age to those of
the Annette pluton. Later intrusion of ultramafic dunite and
pyroxenite occurred during Cretaceous time.
The Annette pluton has undergone hydrothermal alteration
and much of the originally low mafic mineral content has been
altered to chlorite. Foliation is developed to various degrees
A-2
in portions of the pluton with border areas being the most af-
fected (Berg, 1972).
The project area has undergone several episodes of glacia-
tion during the Pleistocene Epoch and bedrock is exposed in wany
areas as glacially rounded and smoothed outcrops. The present
geomorphology results mainly from the Wisconsinan Glaciation
which developed "Un shaped valleys with steep sides and more
gentle val-ley bottoms. Chester Lake is a cirque lake eroded by
a small val-ley glacier. The relatively high ele~ation of Ches-
ter Lake and the steep profile of Waterfall Creek, which drains
it, indicate that Chester Lake basin i$ prooably a hanging val-
ley with respect to the larger valley occupied by Nichols
Passage and Port Chester.
Tectonic Setting. Southeastern Alaska is part of the tec-
tonically active region which rims much of the Pacific Ocean.
The region is situated along the western margin of the North
American Plate close to the contact with the northwesterly mov-
ing Pacific Plate. Large scale tectonic deformation has taken
place in several episodes since early Paleozoic times with the
last major events occurring during Tertiary time. Lesser acti-
vity continues to the present time.
The regional structural grain is strongly developed in a
northwesterly to northerly direction with most major fault zones
and lineaments paralleling this trend. Many of these large
faults, chiefly the offshore Queen Charlotte-Chichagof-Baranof-
Fairweather fault and the more inland Chathan Strait-Lynn Canal
fault are major zones of active tectonic activity (Exhibit A-2).
The Sandspit fault, possibly a branch of the Queen Charlotte
fault, lying along the eastern part of the Queen Charlotte Is-
lands is the closest known active fault to the project site.
Movement along these faults is considered to be right lateral
strike-slip with displacements in the order of many miles.
Vertical displacements are also believed to have occurred along
these fault zones but this movement is thought to be subordinate
to lateral displacement. To the northwest, along the Gulf of
Alaska and southern interior Alaska, these fault zones probably
merge with the Transition fault and the Chugach-St. Elias fault.
Displace-ments in this area are mainly the result of thrust
faulting.
The Clarence Strait lineament, which coincides with the
waterway of the same name, is a prominent linear feature ex-
pressed topographically and on air photos and LANDSAT imagery.
It is thought to be a fault but its origin is speculative as
much of its length is covered by water or overburden. If it is
a fault, large scale lateral movement along the Clarence Strait
A-3
lineanlent seems unlikely and its origin may be that of a rift or
graben (Yehle, 1977).
Fa ul ts are common in the reg ion of the proj ect and mos t
faults are thought to be high angle normal or strike-slip
faults. The amount of displacement along these faults is un-
known but major movements are thought to have ended by middle
Tertiary time.
Several thrust faults have been mapped on Gravina and An-
nette Islands and possess similar characteristics. One of these
thrust faults, characterized by a zone of sheared rock about one
nile wide, occurs along the contact of the Annette pluton and
the meta-sediments of the Metlakatla Peninsula, immediately
adjacent to the project site. The thrust faulting is believed
to have occurred between late Jurassic and middle Tertiary time.
Later normal or strike-slip faulting along the sarne alignment is
believed to be partly responsible for the shearing and is
thought to have occurred during later miJdle Tertiary time. No
evidence of recent movement has been found in the area and this
fault is not believea to be connected to any major re~ional
faults along which recent movements are known. . .
seismicit~. The project area lies within a broad zone of
earthquake actlvity which includes much of coastal British Co-
lombia, southeastern Alaska and along the Gulf of Alaska.
Earthquakes in the region have been instrumentally recorded
since 1899 and include many strong motion events. Relatively
large magnitude earthquakes will continue to affect the project
area as they have in the past. Tsunamis and seiches have at
times accompanied large underwater earthquakes.
Exhibit A-3 includes an epicenter plot and tabulation of
all earthquakes recorded within a 500 krn radius of the project
having magnitudes of 3.0 (Richter) or greater. Most of the
seismic activity occurs along the Queen Charlotte and Sandspit
fault system which suggests a general relationshi~ between some
extensive groups of earthquakes and certain fault zones. The
most recent of the large size earthquakes in this zones was a
7.25 magnitude (Richter) event on July 30, 1972 with the epicen-
ter located approximately 200 miles northwest of the project
(Sitka earthquake).
The largest recorded seismic event to occur in the region
was an B.l magnitude earthquake on August 22, 1949 with the
epicenter located 120 miles southwest of Metlakatla probably
along the Queen Charlotte faul t. tJo shock was reported as be ing
felt on Annette Island but the earthquake was strongly felt a~c
caused some damage in Craig, Prince of Wales Island and other
A-4
places. Reports of damage indicate that the maximum intensity
of the earthquake was in the range of VII (Modified Mercalli
scale). Such an intensity would cause negligible damage to a
well designed and constructed structure.
A magnitude 7.0 earthquake occurred on May 26, 1929, pos-
sibly along the Sandspit fault on the east coast of the Queen
Charlotte Islands or Hecate Strait. The Sandspit fault is a
branch of the active Queen Charlotte fault and may be a major
contributor to the seismic activity of the Metlakatla area
(Yehle, 1977). The earthquake was reported as being felt in
Ketchikan, but not on Annette Island which is nearer to the
epicenter, 285 miles from the project. This earthquake is sig-
nificant in that it occurred possibly along the active fault
closest to the project.
Several earthquakes within 50 miles of the project, having
magnitudes less than 5.0 (or no magnitude computed) have been
reported (Yehle, 1977). These events are not supported by Exhi-
bit A-3, however, and their locations and magnitudes are in
question.
Historic earthquake records and the regional tectonic
framework indicate that earthquakes of similar magnitude and
relative location are likely to occur in the future. Previous
studies (including Yehle, 1977) suggest that the project is
located in an area of moderate to high seismic risk (Uniform
Building Code and u.s. Corps of Engineers, Seismic Zone 2 to 3)
and could experience earthquakes in excess of magnitude 6.0.
A map showing the distribution of the peak acceleration of
earthquakes based on a 100 year period was produced by Milne and
Davenport (1969) and indicates that a peak acceleration of up to
0.15g might be expected in the project area.
An estimate of peak bedrock acceleration was obtained for
this report using magnitude -distance attenuation curves devel-
oped by Schnabel and Seed (1972). These studies were conducted
by transposing the largest known regional earthquake along the
active fault closest to the project. In this case a magnitude
8.1 event would be located at a distance of 75 miles along the
Sandpit fault causing a peak bedrock acceleration of 0.07g.
Based on the historic record of regional intensities and pre-
vious studies by others this is considered to be low.
For the feasibility stage of the project, following preli-
minary studies, it is thus considered that a conservative figure
of 0.15 g should be assigned for peak seismic acceleration in
rock. Further studies, including the determination of the maxi-
A-5
mum credible earthquake, are required during design phase to
verify this.
Project Geology
Overburden Materials. Overburden in the project area is
generally thin and should not greatly affect the proposed lay-
out. The most common types of overburden are colluvium and
talus caused by mass wasting of rock slopes, although some de-
posits of glacial origin occur locally.
Colluvium is the most widespread overburden type and occurs
on moderate slopes at the damsite, in the reservoir and along
the penstock route. It consists of angular sand, gravel and
boulders of granitic material ranging in depth from a few inches
to several feet. Clay and silt size material in the colluvium
is sparse and this material is relatively free draining.
Talus occurs at the base of steep rock slopes, and consists
of moderately weathered angular boulders of granitic material up
to five feet diameter with only a small percentage of gravel and
finer fractions. Small accumulations of talus up to about 5
feet maximum depth occur at the damsite and along the penstocK··
route. Within the reservoir area, especially along the north-
western and southwestern shores of Chester Lake, thicker accu~u
lations of apparently stable talus occur. The thickness of the
talus in these areas was not investigated but it is expected
that depths exceed 25 feet.
A thick accumulation of talus occurs near the base of the
existing water supply line, extending from below sea level up to
elevation 200 feet. It extends laterally from the present end
of Walden Point Road to about 550 feet south of the present
powerhouse. Based on data from drill hole PH-3, which encoun-
tered 16 feet of talus, as well as on areal mapping and changes
in vegetation, it is considered that the thickness of this talus
increases greatly to the south of PH-3.
OVerburden of glacial origin occurs only in scattered areas
within the project area. A prominent moraine occurs on the
southeast shore of Chester Lake and continues up to elevation
1400 feet. This deposit consists of large angular blocks and
some finer rubble. A thin deposit of possible glacial till,
weathered sand and gravel, occurs along the old penstock route
on a small knoll near elevation 250 feet.
Bedrock Geology. Rock Types: Fresh bedrock is well ex-
posed in the proJect area and varies considerably in color from
white to green-grey. The rock is medium grained, hard and
strong and possesses a crudely foliated granitic texture. The
A-6
rock is composed mainly Of plagioclase, quartz and orthoclase
with lesser amounts of chlorite, muscovite, biotite, hornblende
and disseminated pyrite. The variable percentages of the vari-
ous mineral constituents causes the differences in color. out-
crops are often surficially weathered causing a darkening in
color compared to fresh exposures. On weathered surfaces the
rock varies from off-white and light yellow brown to medium
grey.
These rocks are part of the Annette pluton, 'a complex gra-
nitic intrusion, which comprises a large part of Annette Island.
Rock types, which comprise the Annette.pluton include granite,
granodiorite and quartzdiorite. These -changes in composition
appear to result from original zonation within the Annette plut-
on and contacts between the various rock types are mostly grada-
tional (Berg, 1972). Samples of various rock types within the
project have been collected for petrographic examination during
design phase and the exact nomenclature will have to await these
results. It does not appear that any significant differences in
engineering characteristics exist between the various rock
types.
Light grey to green-grey rocks, tentatively identified as
granodiorite, appear to predominate and are exposed at the dam-
site and throughout most of the penstock route as well as the
powerhouse location. Several areas of light colored granitic
rock are exposed along the penstock route between elevation 750
and 650 feet as well as scattered outcrops at lower elevations
along the water supply line. Scattered outcrops of granitic
rock are also exposed along the old penstock route between ele-
vation 250 and 350 feet.
Foliation •. Foliation, variably developed in the project
area, is characterized by the subparallel alignment of intersti-
tial chlorite and mica and to a much lesser extent, by the ori-
entation of feldspar laths. In most hand specimens only crude
foliation can be observed by the presence of thin chlorite rib-
bons but in larger outcrops this foliation becomes considerably
more apparent. Foliation is best developed at the damsite and
in the powerhouse location. Foliation appears to be less devel-
oped along most of the penstock route but its apparent absence
may be caused by the glacial smoothing of outcrops making folia-
tion less obvious.
Several zones of more pronounced foliation, 3 to 8 feet in
width, are exposed on the abutments of the damsite and exhibit a
somewhat gneissic or schistose texture due to a higher percent-
age of chlorite. These intervals, somewhat more weathered than
the rock mass, occur as shallow grooves in the generally rounded
outcrops. A greater degree of iron staining and subparallel
A-7
intrusions of milky quartz also typify these more pronounced,
foliated zones. Chloritic surfaces and joint surfaces in the
more foliated zones are often slickensided indicating that some
adjustment has taken place along these weaker zones.
At the damsite, foliation strikes N25-40E and dips essen-
tially vertical with some minor variance to the southeast and
northwest. At the powerhouse, and to the south, foliation
strikes almost due north and dips 49° to 54° to ~he west.
Jointing. Jointing is well developed i~ the project
area and is extemely variable in both strike and dip. The most
prominent joints are stress-relief joints caused by glacial un-
loading. These joints develop subparallel to rock slopes and
range in attitude from subhorizontal to moderately dipping. The
strike and dip of these joints varies considerably depending on
the slopes to which they are related.
At the damsite (Exhibit A-4) these shallow downstream
dipping joints are prominently developed on both abutments and
are a source of minor ground water seepage. In places, these
joints have been eroded several feet deep into the abutments.
It appears that at least part of the erosion is due to dislodg~·
ing of rock blocks by freeze-thaw action.
Drill holes at the d~msite indicate that these shallov
dipping joints are open and weathered in places but they do not
appear to be continuous in this condition for great distances
and are often unweathered and tight. Spacing of these shallow
dipping joints varies from 0.5 to 5 feet and appears to be a
near surface feature. The occurrence of these joints decreases
considerably below ten to fifteen feet depth.
Stress-relief jointing is noted also along the penstock
route and much of the gradient along the middle course of Water-
fall Creek appears to follow this jointing.
A prominent joint set striking between N60W and N80W and
dipping 65° to 90° northeast is well developed at the damsite
and along Waterfall Creek. Joints in this set are spaced about
three feet but zones of closer spacing to one foot are evident
in some areas downstream of the proposed axis. These joints are
chlorite coated and appear relatively tight. The course of
Waterfall Creek appears to be partially controlled by this joint
orientation.
Other joint sets are difficult to identify because of large
divergence in strike and dip. However, joints striking 1120W to
NlOE are common especially along the penstock alignment. These
joints exhibit extreme variance in dip but in general dip frOf;\
A-8
35 to 90° to the east. In places these joint surfaces are po-
lished and slickensided, slightly weathered and exhibit a purple
to pink coloration.
Joint planes subparallel to foliation are exposed in out-
crop and in drill core. These joints are best developed in
zones of pronounced foliation at the damsite and are often
slickensided.
Most joint surfaces observed in core are chl'prite coated
and tight. Slight weathering and iron staining along joints is
a common occurrence within 20 feet of 9round surface and then
generally decreases. Isolated iron staining and some weathering
occurs along individual j~ints and along jointed intervals
through the entire depth of the holes drilled. Slickensides
occur on some joint surfaces but are generally restricted to
more closely jointed intervals. Traces of clay along joint
surfaces occur only sporadically along the more highly weathered
joints, but this is not common. In only one instance was clay
recovered in core. The clay, about 1/4 inch thick in hole RB-3,
is light brown and slightly plastic and appears to have been the
result of weathering of chlorite. In highly fractured intervals
sand-sized particles occur and appear in part to be the result
of physical disintegration of the rock. Some of this sand size
material may also be the result of mechanical breakage during
the coring operation.
Faults. and Shear Zones. Three linear zones of highly
fractured rock occur within the project area and these have been
interpreted as faults and/or shear zones (Exhibit A-I). The
most prominent of these highly fractured lineal features occurs
on the northern side of the Chester Lake basin, where a rock
scarp 20 to 50 feet high trends N50E from the shore of Chester
Lake to the northern ridge of the drainage basin. Rock expos-
ures along the scarp are highly fractured and jointed with joint
orientations ranging from N40E to N6SE and dipping predominantly
to the southeast at a high angle. Higher than normal concentra-
tions of chlorite, iron staining and healing by quartz intrusion
typify this area.
The scarp enters the western end of the Chester Lake about
500 feet northwest of the narrow neck formed by the existing
dam. No highly fractured rock similar to the scarp area was
found along the western shore of Chester Lake, close to the
proposed damsite. Based on aerial photos and field mapping, the
scarp linear appears to continue across Chester Lake, under the
talus covered lower portion of the deep left abutment and up the
southwestern side of the basin and through a narrow gap in the
southern basin area. Closely fractured rock similar to that
exposed along the scarp occurs on both sides of this narrow gap.
A-9
Jointing is closely spaced and strikes from NIOE to U30E and
dips 75°-90° southeast.
A second area of highly fractured rock occurs north and
east of the powerhouse location. This zone has been mapped as a
fault by the USGS (Berg, 1972). In this area closely fractured
and sheared rock is exposed along stream beds and scattered
outcrops. The major trend of jointing is N20W to N30W with
steep dips to the northeast. Intrusions of quartz parallel to
the fracture trend and some slickensiding and sh~aring are also
evident. The area is also characterized by a subparallel joint
set striking NS-ISW with a shallow to moderate dip to the south-
west. It is not known whether this jOlnt set is related to the
zone of fracturing or post glacial stress relief.
Drillhole PS-2 was located at the top of the powerhouse
slope just north of Waterfall Creek and intersected highly
fractured, moderately weathered and occasionally brecciated
rock. It appears that this drill hole encountered fractured
rock possibly related to the fault zone. No trace of this pos-
sible fault could be found to the south of Waterfall Creek,
except for occasional irregular quartz veining, because of
limited outcrops but it continues as a linear feature observed··
on aerial photographs and is inferred as a fault by the USGS.-
The two faults described above were observed over substant-
ial distances in many outcrops and were seen to be healed with
mineralization. Since the most recent igneous activity is
reported to be mid-Tertiary or older, these faults are inter-
preted to be inactive.
A third fault, mapped by the USGS but not observed in the
field is located immediately west of the project site. The
fault, believed to be the result of thrusting as well as high
angle or strike-slip movement trends north to northwest and
forms the contact between the Metlakatla and Sylburn Peninsulas
and mainland Annette Island to the west. The last movement
along this fault is believed to have been during later middle
Tertiary time and the fault is not considered active (Yehle,
1977).
Engineering Geology
Damsite. Locations of the seven inclined core holes
drilled along the dam axis are shown on the geologic plan and
section, Exhibits A-4 and A-S. The bedrock at the Chester Lake
damsite will provide an adequate foundation and is technically
feasible for a properly designed dam. Core drilling along the
proposed dam alignment indicates that the bedrock is of suffi-
cient quality and uniformity. Foliation in the bedrock, steeply
A-lO
dipping and trending approximately parallel to the darn axis,
does not adversely affect the site. However, the occurrence of
horizontal to moderately dipping joints (in a downstream direc-
tion) under the darn are unfavorable relative to the stability of
a concrete gravity structure. A considerable number of flat
lying joints are seen in the drill cores. Many are iron stained
and/or weathered and a few are clay coated. Engineering studies
show that if low shear strength is assumed along these joints
unacceptable factors of safety against sliding of a gravity darn
will result. .
Layouts of arch-gravity and thin arch darns also were evalu-
ated. The stability of the thin arch darn is dependent on the
integrity of the prominent joint set that essentially parallels
the canyon walls, which must withstand the arching thrust. ~o
confirm the technical feasibility of the thin arch darn, more de-
tailed field study of these joints would be required.
For this report an arch-gravity dam was selected because the
potential stability problems associated with a gravity or thin
arch darn would be mitigated. Further geologic mapping of the
critical joint sets during final design studies may indicate that
a thin arch dam would be acceptable. .
~eathering of the rock mass is generally restricted to within
a few inches of the surface with hard and fresh rock exposed in
most places. Some iron staining, caused by the weathering of
chlorite and disseminated pyrite, occurs close to the surface ana
along joints.
Water pressure testing in core holes indicates extreme varia-
tion in the permeability of the foundation with permeable zones
developed mainly along joints and to a lesser extent along folia-
tion partings. Rapid and complete loss of drill water circulation
occurred at some depths in all holes at the dam site, with the
exception of holes RB-l and RB-2. These losses often occurred
within 10 feet of the surface and were caused by open, near sur-
face jointing. Other losses of circulation occurred as deep as
54 feet in hole LB-2 and possibly as deep as 76 feet in LB-l.
The deep possible loss in LB-l could not be verified however,
because of a previous water loss higher in the hole. Water
pressure test calculations in intervals of lost circulation
indicate permeability values of 2.5 x 10-3 cm/sec to 4 x 10-2
cm/sec.
Water pressure tests performed in intervals of retained
circulation indicate the general ~rmeability to be considerably
less, ranging from zero to 5 x 10-3 with 65 percent of the re-
sults lower than 1 x 10-4 cm/sec.
A-II
SUMMARY TABLE OF WATER PRESSURE TEST RESULTS
Footage
35%
11%
19%
17%
18%
IN INTERVALS OF RETAINED CIRCULATIOt1
Range of Permeability
zero
less than 1 x 10-5 cm/sec. (very low)
between 1 x 10-5 and 1 x 10-4 cm/sec.
between 1 x 10-4 and 1 x rO-3 cm/sec.
between 1 x 10-3 and 5 x Ib-3 cm/sec.
The apparent ground water levels measured in drill holes
vary between 30 and 50 feet below the ground surface. The water
levels rise into the abutments apparently indicating low per~e
ability of the bedrock mass. The level measured in hole LB-l
shows the ground water level to be about 9 feet below the pre-
sent creek level. This depth to ground water is most likely
caused by drawdown from the steep gradient of Waterfall Creek
downstream of the present dam axis. It should be noted, how-
ever, that water levels measured in drill holes may not all
indicate the phreatic surface and could be indicative of the
tightness of the drillhole and its capability of holding water • . .
Foundation Preparation: All overburden, including
tal us, colI uv ium and detached rock blocks must be excavated froll'
the dam foundation area. This should not entail more than a
maximum of 5 feet, in one local area of deeper talus along the
left abutment. Generally less than one or two feet will be re-
quired. Excavation into bedrock to re~ove closely fractured
rock under the dam has been estimated at about 10 feet. Dental
excavation and backfilling with concrete will be required in
local areas of more deeply eroded and weathered surface jointing
and foliation zones.
Trimming of rock overhangs will be required on steep rock'
slope intervals on both abutments. This is especially relevant
for the prominent rock nose on the right abutment, on the steep
slopes into the present river gorge on both abutments and on the
upper portion of the left abutment. Excavation of these faces
should include approximately 5 feet of rock, measured horizon-
tally to ensure the removal of more highly fractured rock which
has been subjected to stress-relief jointing and freeze-thaw
action. Careful control of excavation in these areas will be
required to prevent damage to sound foundation rock and to mini-
mize prevent damage to sound foundation rock and to minimize
blast vibration in excavation areas close to the existing con-
crete da~.
A-12
Grouting and Drainage: It is anticipated that low pressure
consolidation grouting will be required within the dam founda-
tion area to seal near surface jointing. For estimating pur-
poses, it is recommended that ten feet deep holes be spaced on
ten feet centers, covering the entire excavated foundation area.
The holes will be oriented to intersect the greatest number of
joints. Split spacing with additional holes will probably fol-
low depending on grout consumption. Caulking will be required
to control surface leakage.
Construction of a single row grout curtain beneath the dam
will be necessary to control seepage and reduce water losses
from the reservoir. Curtain holes should be inclined upstream.
Holes in the curtain will be fanned in areas of topographic
change to reduce the required footage. For estimating purposes
it is recommended that primary holes be spaced at 20 feet cen-
ters, secondary holes split-spaced at 10 feet centers and closer
split-spacing at 5 feet or less depending upon grout consump-
tion. The average hole depth is estimated at 40 feet with
slightly deeper holes in the valley bottom and somewhat shallow-
er holes on the abutments. The extent of the proposed grout
curtain is shown on the geologic cross-section, Exhibit A-5.
A drainage curtain is considered necessary downstream of
the grout curtain for the entire width of the dam to reduce
seepage pressures and control any water that circumvents the
grout A-2l curtain. It is estimated that drain holes should be
spaced on 15 feet centers and average 30 feet in length.
Reservoir. No areas of instability were noted along the
present reservoir slopes. Several areas of steep talus do occur
but, because of the low percentage of fine sized materials,
their present stability should not be adversely affected by the
rise in reservoir level. Except for minor sloughing and shallow
slides of surficial material, no instability is expected to
occur within the reservoir area following impoundment.
The bedrock within the reservoir area will be adequately
watertight for the proposed reservoir elevation and seepage is
expected to be minimal. The reservoir rims are massive and mass
rock permeability is estimated to be low based on water tests at
the damsite. No seepage problems have been reported from the
existing dam and no springs were observed downstream of Chester
Lake. The assumed fault zone associated with the scarp which is
believed to cross Chester Lake might be a possible avenue for
leakage. However, based on the current high elevation of Ches-
ter Lake and the existence of several small ponds along the
scarp alignment, the permeability of this feature is not con-
sidered significant.
A-13
Penstock Route. T·hroughout most of the penstock route,
(Exhibit A-l) rock is exposed at the surface or covered by a
thin veneer of colluvium less than one or two feet deep. Sup-
port locations will be finalized during tne design phase in
order to minimize the depth of required overburden excavation
for penstock support foundations.
Drillhole PS-l was located at elevation 605 feet along the
proposed penstock route. The rock quality of support and thrust
block foundations, as revealed in hole PS-l, is considered typi-
cal of most of the penstock route. This drill h01e and geolog ic
mapping along the penstock route revealed the presence of stress
relief jointing subparallel to the rock slopes. These joints
are open in places and are subject to freeze-thaw conditions. A
recent minor block slide has occurred along these joints below
station 800 along the existing pipeline route. It is antici-
pated that rock anchorage will be required at the support and
thrust block locations to prevent sliding. Anchorage should
consist of grouted rock bolts varying in length from 5 to 15
feet with longer bolts in areas of steep adjacent slopes, at the
river crossing and above the powerhouse. With adequate anchor-
age, the bedrock will provide an acceptable foundation for the
penstock. . .
Drill hole PS-2, located at the top of the powerhouse slope
(elevation 212 feet), intersected highly fractured, moderately
weathered and occasionally brecciated rock. Small voids and
caving were encountered at depths of 16.5 and 28.5 feet. The
hole was ter~inated at 35.7 feet. Although core quality im-
proves at depths greater than 20 feet, it appears that this
drill hole probably encountered a fractured zone over its entire
length.
Several areas above the penstock route in the river gorge
downstream of the dam axis will have to be trimmed to remove
rock overhands which might represent damaging rockfalls. Care
must be taken during construction of the penstock to prevent
damage to the existing water supply line where the two are in
close proximity.
Powerhouse Foundation and Slope Area. The proposed power-
house location is to be founded in bearock on the shoreline and
immediately north of Waterfall Creek (Exhibit A-l). It is lo-
cated at the base of a steep 45° slope which extends upward for
some 200 feet. Bedrock, tentatively identified as foliated
granodiorite, is exposed throughout the powerhouse area and for
most of the slope area above the powerhouse. The upper portion
of the slope is covered by a thin mat of vegetation and minor
rubble generally less than two feet in depth. At low tide
levels a dissected debris delta is exposed comprised of reworked
A-14
sand, gravel and boulders up to 6 feet in diameter. It is re-
ported by local residents to result partly from a catastrophic,
debris laden melt water release from Chester Lake in the
1930's.
Drillhole PH-l (elevation 40 ft.) was drilled toward the
southern end of the proposed powerhouse and oriented approxi-
mately normal to the rock slope. The existing rock slope is
developed subparallel to but flatter than foliation which dips
at 49° to 54° seawards to the west. Surface wea~hering of the
rock extends to a depth of about 2.5 feet as revealed in the
hole PH-I. Iron staining and local slight weathering along
joints continues to a depth of 30 feet'but evidence of weather-
ing is generally absent below 16 feet. ' Fractures, oriented
approximately parallel to the rock slope, were observed in the
core. These fractures may represent openings either along foli-
ation partings or stress-relief joints. This fracturing is
closely spaced within 5 feet of the surface. Below this depth
the occurrence of fracturing decreases greatly. From 5.5 to 57
feet in depth in hole PH-l jointing is slight to moderately
developed with an average ROD value of 85%. The proposed loca-
tion will provide an adequate foundation for the powerhouse.
Slight artesian flow was encountered in PH-l within 5 feet .
of the surface and is probably due to near surface water flow
along open jointing. Water pressure testing of hole PH-l re-
veals low permeability below 10 feet in depth (K = zero to 4 x
10-5 cm/sec), and indicates that jointing is tight.
The excavation for the proposed powerhouse consists of a
nearly vertical cut, 80 feet long, notched into the steep 45°
rock slope. The near-vertical cut behind the powerhouse will
undercut foliation along its entire length.
Anchorage must be provided to support the slope above the
powerhouse. Anchorage should be oriented to provide the optimum
support for the foliation planes and other steeply dipping
joints. It is estimated that a pattern of grouted rock bol ts
and possibly high strength rock anchors should be provided for a
width of 100 feet and a slope distance of 60 feet above the
powerhouse cut. Rock bolts must be provided to support the near
vertical construction cut at the back of the powerhouse. Drain
holes should be provided to reduce seepage pressures behind the
construction cut.
Because of the past occurrence of debris laden meltwater
discharges from Chester Lake and the possibility of future
debris and minor rock falls, it is recommended that the
powerhouse be designed to deflect such occurrences.
A-15
The area south of Waterfall Creek was investigated for
alternative locations for the powerhouse. Previous
investigations discussed in the Definite Project Report voiced
concern over the stability of the talus slope. Our studies
confirmed that the area is predominantly covered by talus which
increases considerably in depth to the south. The depth of
talus and configuration of the underlying rock is unknown,
although drillhole PH-3 revealed 16 feet of talus and poorer
quality of underlying bedrock than in drillhole PH-l to the
north. Excavation into the talus slope for a powerhouse
foundation would create a major stability problem over a
considerable area. Exposed rock slopes at a number of places
are steeper than the bedrock foliation"and are thus potentially
unstable as described in the following discussion of the Access
Road. Finally there is the unfavorable aspect of the seismic
loading affecting stability of talus above the powerhouse
excavation. Construction activity for a penstock line across
the talus could also disturb the stability and would present a
problem for penstock foundation.
The difficulty in maintaining the integrity of the talus
slope both during construction and over the long term, the large
quantities of talus excavation involved and the extensive ••
measures required to stablize steep underlying rock slopes have
been the major factors influencing our rejection of any possibl~
alternative powerhouse locations south of Waterfall Creek.
Access Road. A proposed access road to the powerhouse
would extend northward along the shore line near the base of an
existing steep slope for approximately 1600 feet from the pre-
sent terminus of Walden Point Road. The road would traverse the
base of a thick talus deposit over some 1000 feet of the south-
ern part of the route. The slope along the northern 600 feet of
the route is formed by local talus deposits and intermittent
bedrock outcrops. The slope is heavily forested except for the
rock face behind the existing powerhouse.
The existing talus slopes, reposing at 35° to 45°, are
presently generally stable as attested by the many vertical tree
trunks. Some local areas exhibit creep as evidenced by bent
tree trunks. Excavating into the talus slopes to create a bench
for the roadway would create a potential for future slides. A
massive slide in the thick talus deposit would close the road
for a long period while cleanup proceeded and, in addition,
could undermine and rupture the existing water supply pipeline
which traverses the talus high on the slope.
In places where bedrock is exposed along the 600 feet long
northernmost reach of the proposed road, the configuration of
the rock slope conforms roughly to the foliation which dips
A-16
about 50° to the west. Mass wasting has undercut foliation over
a portion of the rock fate behind the existing powerhouse and
locally at other outcrops where overhanging rock blocks remain.
For the most part the existing rock slope appears stable. Exca-
vating a roadcut into the rock slope would undercut foliation
necessitating extensive stabilization measures similar to those
described above for the powerhouse excavation.
For the reasons given it is recommended that the access
road be constructed as a fill section throughout ~nd that any
borrow operations or any other construction activity, which
would cut into the existing slopes be ,voided.
construction Materials
There appear to be no easily exploitable sources of natural
concrete aggregate in the area of the damsite. Several sizeable
accumulations of large, blocky talus, a glacial moraine and an
alluvial fan occur around the lake but these areas are inacces-
sible except by boat or by blasting a haul road. The closest of
these deposits is a large talus deposit located approximately
800 feet north-east of the damsite along the western shore of
Chester Lake. Borrowing from this presently stable talus could •
cause potential instability during later impounding of the res-
ervoir or seismic loading.
The most accessible potential source of aggregate near the
damsite would appear to be to open a bedrock quarry operation
located on the left abutment several hundred feet upstream of
the proposed axis. A quarry in this area would require minimal
haul distance to the damsite and would not create instability
after reservoir impoundment. Since the quarry site rock is the
same unit as that at the damsite, petrographic examination of
core samples from the damsite drilling will be carried out as a
preliminary check of the acceptability of the rock for concrete
aggregate.
There are two existing bedrock quarries on Metlakatla Pe-
ninsula along Airport Road approximately 1.S and 4.0 miles from
the end of Walden Point Road. Both quarries are in moderately
fresh, moderately fractured interbedded meta-greywacke and meta-
siltstone. Neither quarry is in operation at present but mate-
rial from one or both of these quarries was accepted for fill
and riprap in the Metlakala boat harbor after appropriate test-
ing by the Corps of Engineers. The Corps of Engineers did not
perform concrete aggregate acceptibility tests on this material.
Estimated in place rock volumes are large.
Metasedimentary rock appearing similar to that in the two
existing quarries is exposed in a roadcut near the end of Walden
A-17
Point Road. A quarry could be opened in the northern end of the
small hill adjacent to the roadcut which would reduce greatly
the haul distance to the project site. One unfavorable fact;r
of a quarry operation in this location, however, is the close
proximity of the present water treatment plant on top of the
hill. A quarry in this area will provide sufficient quantities
for the necessary concrete aggregate. Further studies during
design phase are required to prove whether sufficient quantity
can be obtained for use as fill and riprap.
Bag samples of material representative of the two existing
quarries and the roadcut have been collected. These samples
will be available during design phase for petrographic examina-
tion and appropriate laboratory tests to evaluate the metasedi-
mentary rock for use as aggregate and riprap.
Beach gravels along the southern shore of Port Chester and
alluvial gravels in the stream valley extending south from the
end of Walden Point Road were noted but were not otherwise in-
vestigated or sampled. Either of these would require rather
extensive sampling and testing if tRey were to be considered as
a source of concrete aggregate. Problems of exploitation would
be faced at both sources because the beach deposits are subje~t·
to daily tidal flooding and the stream deposits are covered by
heavy forest vegetation and are probably underlain by a shallow
9roun~water table. Therefore, neither of these sources is con-
sidered to be a viable alternative to the potential rock quarry
sources at this time.
A-18
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THRUST FAULTUPPER BLOCK SAWTEETH ON
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PS-2 DRILLHOLE •
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EXHIBI1 A-4
EXHIBIT A - 1 ---~~W77: I , ---.... , /
N 120,7000
, '\
':) / ,
( (
••. -----..L_.--:~
Inferred
Ri,h-enele fault or other 11ne_ent
•••• A'
Thruat fault; aavteeth on upper plate
la, b
2
3
4
5
6
7
9
10
11
12
13
14
15
16
17
Queen Charlotte fault
Trana1t1on fault
Ch1cha,of-laranof fault
Fairweather fault
Chu,ach-St. El1a. fault
Chatna. Strait fault
Lynn Canal fault
Chi1kat Il1ver fault
Duke River fault
Totachunde fault
Sbakwak Valley fault
DeDa11 fault
Sandap1t fault
Clarence Strait 11n .... nt
eoaat lan,e 11n .... nt
Sitka fault
Fron Yehle (1977)
Scale 0
Scale 0
I
50
50
HARZA ENGINEERING COMPANY
100
100
150 Ki lorn.eters
I
150 Miles
DECEMBER 19B1
EXHIBIT A - 2
ALASKA POWER AUTHOR ITY
METLAKATLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
REGIONAL FAULTS
.....
../ . ••• . .
ect Location
EXHIBIT A - 3
SHEET 1 OF 4
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PR[PARED UY THE NATIONAL GEOPHYSICAL _NO SOLA~-TEkR[STRIAL DATA CENT[R
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tAI..ASItA STA7E PUo.!'OE ZONE I)
STATION I\IOR,HING [ASTINC ElEVATI0f4
D ... ~l 120 71 ~ 0.0) ]1)2714.99 'H'l."
0.. ... -2 12075'i4.20 llJH1O.H 9"10.89 .. 1 1201160.0 lIlHH.2 lJ':IO.l .. 2 1207391.2 11)2"').~ IRO .1 .. J 12074'4. Q 1112964.7 'I2L}
La I 1207100.11 11)21".9 8H.8
L. loA 110?1'J't.J J1 1UH!. 7 847 .4
L. 2 1207146.6 1111I1U.1 871.4
L8 J 110710!>.J 11'1141.9 907.7
HARZA ENGINEERING COf.4PANY DECEf.4BER 1981
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( l,ll ~ .1~O '#0
CHESTER LAKE
EXISTING CONCRETE DAM
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itrill" ~u'ld Dip ot JoLnt. and
.Joint s.ts
St..rik." And Dlp ot rol1~u.lon
V.rd..cal !oUatlon
,",,11'1 accWIIl.Ilatlon ot' Tahll I.1I.d
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EXHIBIT ... -~
R8y • Iftclln~ Dr111 !tole
1. c.oloqlc _?pL:'I~ ?'I'rt':::.r.-d dl.lrl.n'i
KovlII~r and ~c.I"!.r,..: 19.1
2. ror •• ctlon ... -....• _ I.xIHblt A-'o
ALASKA POWER AUTHORITY
~ETLAKATLA POWER AND LIGHT
CHESTER LAKE HYDROELECTRIC PROJECT
DAMSITE GEOLOGIC PLAN
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!:' I \ Legeru: EXHIBIT A - 5
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= _ ==i:ted zone
.., Loss 0= =:..rcula tion
!..eo'el.: CL:. Clay
re Fiaces
perce:::lt
s, an:! :":'1.:'_. l. t::m,
and !::I:;r-':':'e:-s.
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ANNEX A
HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
September 1978 PROJECT ••••••• c.A.~~.f.1.'!:. ... t.9!-.f.~ ... __ ._1$..19 ·8
ShettNo 2-
DIte .JJtZ921?
Hole No ••••• '.~.:J ... ~ ....... _ .... Angle (from Horizontatl_ •••• b.Q.~._ ••.•.... Ground Eln.tion •••••• :tSi7 .... 7 •.....•....
Feature •• J.f.f.i .. ~~.!. .. !1~.'~... Baring •••••••••••••••• ~~J.1; ............. Rock Elnabon ......... ?<;~~.m ____ ... .
Coordin.-: N ••••••••••••••• _ •••••• o.te SUlned •••••••••• 1) ~,.f'f. ...... _ ... OYerburden Thicknell _ ••• ::-.~._:: __ •• _ •••
E ..•. _ .•. ,.. ...• _ ••.. _ .. DIU Compteted _._ ••• _LlJ.'J..'J.1.t. •.••••• ___ Ground-Water ElftatiO--.--'h-.. -.-----
Cor. SiZII ••• LIf_!. .. Lf_ft.ti.) ..•.• Toul Depth __ ••• __ ••• _._~_?_B. ... _ •. _ Lota-:t by _ ••••••••••••• .:~~._J:.!_'J ______ _
Graphic j 1ft. c_ Log
,9 ii . ~ 1ft. Remarks
; a-t i j a..iflc:ation ..uS Phylical Condition Q (Sampte Om, Water Leftl., .Ie! I j a
1&1-I ·s = ac: Drilling OtirlC'larinica 11C.)
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HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2 / t
September 1978 PROJECT •••• C.A.~.~/e.": ... .r./! .•• ~ ..••..• .!.~.rJ· 13
Hole No ••• __ .I::..~.;~.-r, ....... -.... Antle (from Horizont.l) ••••• b.Q.':.. ......... Ground Eleyation ••••••• 7..9.?~.1.. ........ .
F.-ure ••• '".d.t._~~.!:...Al.!1.... a.rint •• ~.~ ••••••••• ~l.~f .. --..... -.... -... Roctc Eleynion ._ ••••• _.~~.c. ......... .
Coordlna_: N •• Z;~Q~k!l.~ •.• t.. o.te Started •••••• -'4I/I.~t) f._............. Overburden Thidc."'-a •••• Q.:.O" •••••••••••
E .~ .. _!~. r.1{.~1.._ .. o.te Compl.-d ••• /j./..'I. .1.e ...........•.. Ground-Wner Elevation .~.K'~?·1 ..... .
Core SlIM ••• .z:.,;:.~ .. ~ G..,l. •••••• Toul Depth ••••••••• §: :.7. ............... Logpd by ••••••••• .Djl.t~'I-.......... .
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a-HIcation II'Id Ph.,.., Condition
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(S.mple 0 .... Wl1er Leyel ••
Drilling Owec1llrirtics etc.)
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Harza Englneerl~g Company
Form SG-Is
REPORT OF WATER PRESSURE TESTING
PROJECT C nO t~y-/.4. ~~ 1$~<f9-5
HoJe No._......::;L....;&~-_3 ____ _ Angle (from Vertical) J 0 0 Ground Elevatio:1 907 7
ROCK Eleva1:ion ~~~ -=::::::.;..~---Loc a t ion.--!'-::..:;..p.:...-.f-l_ .... ~=;...~~_~:....,....;)~, i..
Coordinates: N 1) 2.c:l7, Z.c>~.3
Bearing 2~2 0
Date Started 18/3 I
Date Completed /1/ /1 J~(
Water depth dunng test Dr;t (52.)
Logged by D A 'f n 'I E 3 1~2 ~~I <7 I , 1 .
-.... Pressure Depth ... Meter til ~ -
""' IV til 0'1 I
0 ..... IV .3 XI~ ~ C Rate' I1l >-~""' IV .... .N C IV ... Test .t::, ... -.~ til E of .... E c: 0 e ..... ... ~~ ~ ...... 0.-IV (,j e· .... ........
No. From To ~ ... IV Start Ene IV ""' .... ~ IV Loss 0'1 til , -::::I -... Net IV ....
~ 0'1 + ..... I U 0...0 -C'" ......... ..... E -0 -fft. IV.... til ~::::I I t.l .... <-' ;1 ~I . ... (pSl) oJ CJ ~ U 1 (gpm) u ~ -e-.. c... --m. e-. units
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I. ? 2-/.1 ~ J O./L 1-'2 '-k It.L I r.~ IO-S
2. 0 2. Z .J J 0.21 IS" . .
2.2 :J 2.'1' I cl 13 I :}--"-_6 -2./. t. 2. 3"" IO~.s
2. 'It. L. 70 I 02~ ,~
r.o 1.1 ~ , C). I, l()
.3.11 J. Z. I ~. /~-/~
J,2 q 3.'-1) . ~. : 6 /1 '.6 It.!, 2.1 2xi:J-s
3 ? l.t. 33.0 ".!oJ 7.i ~. -r:i , (J.'l~ Ie,
~.7f ',12. I 0.1'1 Iv
'.72.. /D.I.Z \ 0.90
'
0 ---'
10. '" z-/1.413 1 (!) '('l-10 )(}I I g ) 1)1. 10-"
3 2-L.I? 1 I, '5' 20
4,7 , 2. I LS 2CJ .l 2 i I I -'I ,2',( I r) :
(;.2 7.f. S , IV~ 2-0
7.'K~ 7~~ 2. 0.0 ICJ -2o. , o.D 1
I
"+ 2.'1 <" 39.'1 10 Jot 7. 0 rl.D I '.0 I"
~ ... ,., ttl= lH.o Lo ~~ ~/ 1'3.0 ''',0 1 _" 0 ,~ J 2!'-I',S" 9. 'f /'t'-t,;JI
,.~ J.·I ',' k4',r d _,I @ .,~ 0 )2.0 , i.O fO
, . . .
~
1
5 3<6.0 52. IJ.t( 1. 1. O! 1.1 C; , . . -" -2..0
4 4'; II l I 2..'h ~ 0
1\, "7 !I..I.~ , , -;
-';
. . J.Z!./.J:J-If -
r t(, ,) 'It 3 = 3 ~ \I ;1 4.~ 3 z. .r -
Dept.h to g:-ound· .. ate:-. __ feet X O.433"' __ psi Gage + Column -Friction Loss=Ne1: P:-essure
• Column pressure = (depth to mid1le of tested interval or depth to groundwater, whl~hever 1.5
smaller) X (0.433)
(cr.verslon facto:s: =u.ft.x 7.48=gallons
meters X 3.28=feet.
2 kg/em X l4.22=psi
liters X O.264=gallons
HARZA ENGINEERING COMPANY GEOLOGIC LOG Sheet No. ,;,' ~
Form SG-2 I
September 1978 PROJECT •••• ~!1.!.i.t!*..r:..J.9.t:~ ...... !.l1.'-;.a Dlte •• ~~(.~7.ti~
.
Hole No •••• /:..4.~.J ........... -.... Angle (from HorizonUiIl •••••• i.a..~ ....... .
Feature •• ~.~1.:t:.~~.~........... ~ng •••••••••••••••••••• ,.7: ••••••••••••••
~~inatel: " •••••••••••••••••••••• ~e SUI~ ••••••••• .L!.{jfJ.1[~ ••••••••••••
E •••••••• ?~ ••••••••••• o.te Completed •••••• jJJ."t./.1.~ •••••••• _._.
Core Sizn •••• ~-'If.. .. J...~J1.g;; ___ ToUI Depth •• -•••••• ..s.'-~.7. ...... _ .. __ ._._
GrlP.dc
.1 i Lot . ~ f J j a..ifiQtion Md Physical CondItion J~
WI -~ '2
0(
1
-A .
P-I~ c\".lo' . I
I-~ ~ t='o\:4t-J. 6~d:Gr,l. (~ G-bo~~)
~ V 4$
tl-~ 2-cU.,
~ ~,...-cl
I-I~ ~o ,LI.a ..
$Ii~k r-~o· cl~. ~~ 1/ ~. ~.~: ... -~ / ~. d..( ...
~ lI~. 5 -
'r .", ~i d,I~,. .1-S\~t
P-,..,. 10' c~( ...
I-,/ 1(0 S u: .. ~"I"
~ / If,;,'" TO'. Ct. ...
"'I-
w '-Ta; ... ·
30' cL..r., I---' ~ V, '/0· ,t..( ..... ,
I-I ,.
t-il o' ~I..~I-C.~ -. -I-~ ~ 'TO' ~IaT
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ct. .... !'5:i.~ .. ~t .. "",
I-$/0-,...cl. .
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,~ -'c I l7o~ icJ., ....
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t-" 10' "1 ....
, ... r--~ JIJ" ~.
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r-~i~ "'P--V ~.
~
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r-I; CIJ· CJ,.C-.
.s'll
I, C. SV.,
Ground EI ... tion .. u.u1;ic~"'!u""""
Rock EI."etion •••••••••• • ••••••••••••••
Overburden Thick ........ ~!.? ....... _ ..
Ground-Weter EI."lti,; •• __ •••••• _ •••• __ •
Logg.d by ------{J.~-.-.. :t-.. --.---... -.-
t at.
II at. R ..... rks
c5 II: Q (Simple DIUI, Wlter unll,
I j 0
a: II: Drilling ~rlCUriltics ttc.)
cJ
, ---
I~ ~ -
0 ~ -~ -
---.. -------~ ~ I~ -
"-
~ -----
~WL J1-M If 1"/17 ~
-----
--
I~ o~ -
b: -I~ ---
/..OISS .-(2 O.s' <: O~. I ...... -
t.~-t ru-d ... ~ i'u -
b,..~ •• (~ c.o·i"', -
HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
September 1978 PROJECT .--c.!r..~_?x:_t.f.!._!.~ _____ 1J..'l.?::!$.._
Sheet No .• 1.-::.1 __
Dlrte .J.L.;~.~. '}
Hoi. No •• _______ £_~.;_?. _____ .. _ .. __ Angl. (from HorizonUl" .-_. __ bo._~ ________ Ground EI"ltion ••••• '!l! .. 'L ... _ .... _._
FelltUnt .(.:;£.i_fA.t.d •• _I:.I!.!J ____ ••• Barinl .-.-... ----.---,~.:;.~J.~--.--... --.-. Rack EI.v.tion ••••••• ~~ •••••• _ ••• _
Coordil\l1lll: N •• .I+l.P_!;_?'fi .. '... om Started ••••• --•• .Lt.;,.t.'i~I. ...... __ ... Overburden Thickneu ••••• 0.\.0. •.••••••••
E •• ~ .. Jli .. :r~ .. .J ••• _ om CompteUd ••• -_//-lll/-rl.. ___ •. __ ••. Ground-Wet ... EI"ltion '";JI..Z?~ ... ':f •• __ ._.
Cor. SiZ81 ... 1_.~2 ... tt.B.G.J.._._. __ Totlll o.pth --____ •• ___ 6.a.~~--------_----Logged by ____ • __ .~JA. .. t:O:¥_-•.•. -•• -.
~ -
I-
2 l-
I-
l-
I-
li~
l-
I-
i-
~ l-
i-
i--
""6 l-
I-....
i-
)1-
l-
I-
i-
'2 I-...
l-
i..
!'.[ I-
i-
l-
i-
11:-.2 -5 Ie!
..... -
0.3
Z.Z
q,J -
;~ I-If..·.'-
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I-
'1-
i..
.... 11'1,:")_
i..
Grephic
Log
f. ~~ ... ,;.
'-.
OuIiflcltion end PhysiClI Condidan
O.O-7,~ C'O~\'1 ~c~.
~~ t>1e.C.-<::),G.. ""',"'. "10.\
14.~~ *'-'f ~. 2. ~Q."" ~ $-(:~
~~ to.. o.-.t:I v-~. "'-..uf,.
~o~",,,,, S~u"~c.es. o.f-t.-"V,'.-t"
cl,..(.Q'tI'\'.t-. ~ s\~l...Jt'1 ~~d
\J,j.1 -t\.. F.. s tc:a. \:..... .
. "8'.2.-'0.0 5\"'~-t\'f M.c~td.
"./' .. :':. (1.1"... u... ., 1". • _ N.. ..JJ... r;\' .... ~ t .. k... ,,,..)1. ?If!<''' .;:1+-1"' ~\"" ..."..,. ,.. .... ,
I.---' tIl (1...1 __ . \.O-I,z..+.f. ~Qr-c< ~ S~~I
V /0· c.l \,,-. ~ "" o,....J. V'W' ....... ~"'...... Jt:H'y\+
,. , • -:", r
~ ,:' :'.' ,.....
-c' r. ... "~J",\. V"
S ...,.r~ c: ., <'dCL -+ a tI \AI ~ cJ,...loV"\.Ir ...
O("t,D..:.( "" .. It 'f S( (c..t:.......h~... "-tJ
~1.L \.....' .. , F.t Sto., ... ~ al~L.'"
~ ~l...lI'i~ 0. \~ .... ~ 1 C> ,~-'1. ca. .. 'toQ'tci
Remarkl
(SIImpt. D_, Waur Lev.ls,
Drillinl et.,-=-riniCi etc.'
iOO~ lV • ../~. luti'j e ~, -.
--------------
..;.
---------
---~.~
Hole No. ~g-3
Location krt. t. t /~. t
REPORT OF WATER PRESSURE TESTING
PROJECT as -I.e".-'kf~ /.5'(9-£ -.
Angle (from Vertical) 50 0 Ground Elevat~o:i
rf/,~ ~ ) Bearing 2. 3.2 0 Rock Elevation
(10 2,]
s..tl M ~
Coordinates: N Date Started II {3..Zy!. Water depth dur~ng test D~
E Date Completed II '/1 /'t'J Logged by D If fn':j.
-..... Pressure Depth ., Meter III I1l -........ Ili 1IlC" I
o I1l Ili s 'f ~ '0 c Rate' I1l >-, .... Ili .... .1"\1 C III ... Test .J:. .... -• Ili III e of .... e c 0 E .... .,~'O \.0 ., ., Co-lli (j E .... \.0 ....
No. From To 'Z., Ili Start Ene tV ........ I1l Ili Loss C"tIl' -::l -., Net tV .... + -I -c ..... .,:;;-.... E I1l 0" -o . -u Q"..Q
. ft. Ill ... til ~ u, I ~ .... lj ~ ~I u . ... (psi) -..J QJ E-(gpm) • \.0 --m. E-c.. un~ts
5 ~~ 52 I'" .4 1,5 C.~ , "." -• ~,j
~ c, 12..0 r 5.G-,'1D 17 12.. i(S' 12, I ),/0-'1
r ,', '" ..( (,,,~ -L'rl'<i<.. .lir··':·' I 'f~
q,o ,~. 5 I 5.S :0
IU·S :'0.0 5.S 2" I 7 12-2S" -38 Y-.lo·4
h t.Jt'( :: CI.7 ·~.tJ ~.$' 7, t.f!' \ ~.1 ) ~o
.~ r.() 2. t/ u 1 c H' z.r:: 2u." '2.. 3'r. '-I So n IO-J"
~. S-11.2 I I. 7 "c;
/I., 11.0 I r. , .:.Ie; zo.~ 3.5 Sf..9 1.0·~ / o-::S
13.0 'u.~ I I, ~ '(0
'S'. ~ I (,~ ~ I , ... )' (0 Z~ 4 3 3i, ~ "!X/U-S
'~ ",. (~. '2. , .., -
.) ) .-C
7 1f63 Sq. 7 /3.Q 7. 1 ~7( I I./~ ~o
'i.} ~ . ~ . 41 ... '\ 2. / =," Zo /'1·f 2-~7."K I~.'i ;tlD-5
11.1 ' i ~ ~ I /,7 S' 'ra
It. ~ 5 ". ~ r / !. ~c lfu 11.1' 3.s Sh.3 Is 2.,X IQ S
/ 7. "-I~' ':"( I "l ..... 20
.... • 'f' ':11 ... " I. :. 20 I 'f ~ '2. 378 'f.5}/(,)-~
. .. ... i,' , ~o 'J.t I -:>,1 ~ -'"
7.7 .,os '. -."' 2 :. ""'! :z ..
~(" ,w, I:: , j,C) Z ,-'
!4,1 I'" " .. , .. .I :c-/ tt,~ If 1:S, S-t.!..) I(}-S
!<,/,O 21. ~f , 1. 5~' ::0
! '. S ~ lS.~f I 3 . .S' -' -19 S" 7 '12. 'S g,2, 'lID-'"
~,,, 12.7" J. 'S :~ ,,~ t..7 32.~ j,l}-10.1
'l .. ' c: '5· 5 ~",; r
Dept.h t.o g:-ound· .. ate= ___ feet X O.433-__ psi Gage + Column -Fr~ctlon Loss=~et ?reSS\lre
* Column pressure = (depth to m~ddle of tested interval ~ depth to groundwater. wh~=~ever lS
smaller) X (0.433)
"::onversion faeto!'"5: =u.ft.X 7.48=qallons
meters X 3.28=feet
2 kg/em X 14.22=psi
11t.ers X O.264=gallons
"',
HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
September 1978 PROJECT •• £1..~.-6Jt: .. I.~.!:"':-. ...... !.J..f..f..:{]' •..
Sheet No. J/.s..
Date .///.iiZ.rr...
Hole No· •••••• t..8.:z..f .. /G.7 ... Angle (from Horizontal) .•• o.£.q.: ......... Ground Ele.,8tion ••••••• ~lL':! ......... .
FeatUre •• '".~.f.t ... ~ ......... ,.s.. .. Baring .•• · •••••••••• .?l~ .................. Rock Ele.,8tion .••••••••• S.~.-:t! •..•.•.••
Coordinltel: N •••••••••••••••••••••• o.te Started •• ; ••• 'if.;.!L............... o.erburden Thick". •••••••• ad,i ........ .
E •••••••••••••••••••••• o.te Compllrtftl •••• '!/.I.J/..7.L.............. Ground-Water Ele.,ltion ••••••••••••••••.•
Core Sizes ••••• k!t:! ..... l&.Q'J...... Total Depth •••••••••• A:Q .• Q............... Logged by ••••••••••••• P.JA~£':.!:t ....... .
Grephic ,~ c:_ Log 1 'tf.
,9 fi ¥ 'tf. Remarks >-• oil Q 1; Q, S' .. a .. ifiCltion and Physical Condition c:I a:: (Sample Data, Watar Le.,el., .Ie! ~ c :I i a , ! a:: Drilling ~recuriltics etc.) "'-'! a: c3 .. a :J c (J
( , ,.
FoI~-I-.d G~I~"l+" ~ 1./ ~ .:,,~. eel" ~~"4 \
.
~ sl~\..+'..., F-=ac +" .,..J, -
~ -
~ ~ ~ -<:::) c:)
~ '/ . ' c1..1o.r, ~ ~ -.,
~ 0 -
~ I r.._I.~':c.\&. -I , CI-,="
l-I q, P ... I'S " -
~ , !...;1 .... -I
I-~ I~ rio I .... , .. -
~
~ 4',0 --
I-r~ I .. ., --., fe' --( I
G/", -,.
~" , ~
I-0 -
~ ~ ~ .
~ ~ ~ -c:) I-...... -
I--
~ ~ ~ '20 c.l l Q,( -.
I--' ~~ C;'~(N -. " -v i'o --520 ~+,ro~ bLUL -
~ f-i' ~ -, 1/111, II/IJ/'/ -
t-~ ,., -I
~ \ Or-, (I ... ,... ~fcSY'''' s ~ 0 rLI.v !f"I'd (oo'f:, fIz () -~ so SI,r, s~ •. ;.. r-1-:--ope.-t o~s ~ S~CI -
~ 1 I
q./ c ~ I.... . -~. ~ l-I ~ --~ ~ -
~ -
~ -.'~ . ~ r ( ! •• ,~ -
~ , .. s'r" sl. .. ',.. , -~ (
l-V 1='<. SkA .... -
~ '0' St ~.l..I"t ...... -
~ -
~ I~ :c (~ , .: .". -.lll;.O ~~ -:,. . 'v
Form SG-2
Sept.mber 1978 PROJECT •• £U.!.S.i:tr. .. t.C!..!.'..IJ.. .... i.$.i.'7. .. :ti
Hoi. No ••••••• f.t3.:?: .......... _ .... Angl. {from Ho,itonuU ••••••• 45?: ....•.•••• Ground EI.vftion ••••••• '[l1..'t. ......... .
F.ature .fe&. .. ~.t. .... ~~~ ... a..ring •••••••••••••••• Z.~.'2~ ......... !. .. Rock EI.vltion •••••• Si.t!.!t ............ .
Coordina.: N •••••••••••••••••••••• Data Sun.d ••••••••••• U 'II 111............ Overburden Thick .......... .Q..~ •••••••••
E ••••••••• Z ........... e.u Compl.ted ••••••• I! j}lT.~ ..•. _....... Ground-Wlter EI.vation ••••••••••••••••••
Cor. Sitn •• _ • ..rI1.~.... £.Q..).. •••• Totll Depth •••••••••••• -'.O.:.Q ••••••••••••• Loggld by •••••••••••• ..1Jl~.;,£!'!.Y. •• _ •...
Graphic J c_ Lot 1fl
'j is j 1fl Ramarks r • J a-iflcation and fIt1YJica1 Condition Q (Slmpl. DIU. W ... , L.vels. ,;! I = ~ I S II: Drilling a.rlCtllrinics etc.) "'-'f! a: i c u
~ V t,o' ~',. "!V · r ... f".,JJ "'·It\ fo\~W 6~d:""~4 (Q. \ Q 1,.,,,.' I--
:s "'1. \.. \-''1 ~ fOe -' ...Nf.c( t
~ ·
I-0 ; I, t,#. ,\" --
"" -
I-:' .,r ~ ~ -
~ / ;..,; ; -~ .. " , . ~ \l · s.;..; " ~ I-"--
( ff~' ""-
~ (\,.1,:< -. 41"L
l-I -..
l-·
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I-'27.:J --
~ -
I-"
~" ~,/
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~
l-
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j
I-, ., lo~ -~\. r''!/l . ~ ~ 0;' ~~'-,/ .., .. ·
I-(l':.tl. rc.J<NI r,",'~i .. 1 !~ ... ~ -g, .... t;..
~ !JI, .,...,. ~ ~ ·
I-~ -•• cl..l.:I"" C " ~ ./ • ~ 0... ·
l-I-/0' eL', , -
!, (;; 51, "c S"'."
,
l-· • /y l:t" --, -
~
. ·
V ~' 1.1..,.
I-7-':/ <:1.1"" -
~ ~ Ct;+z oJ_ [.J, -, ~ ... ~;, f 1..~t'iI • .
I-",-!, ..... '"' ~I "'P (' # ~.!'I." -C' ....
~ 3'.1 ~ '. ( ' •.• J"'" -·
I-" ,I..:~" -
tr;-I.,
~ ~. ~-'~I';"'..I.,:;. ·
"
, . ¥ "S :. -r-
l-· -I--~
HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
September 1978 PROJECT ••••• ~i!!~.i.~ .. f.q.f.~ .. _ .... L.J.1:J::~.
Sheet No .. ;j~ ..
Olte •••••• __ ._ •.
Hole No •••• I:.P-.::!iJ"'C"""""" Angle (from Horizontal) ••••• b~.~ .......... Ground ElevRion •••••• ~~.~~~ •• _ •• _ •••• _
Fe.wre •• !:.dt .. ~ ... IrJ(.!L._ "rin, .•••••••••••••• .Qj~~7.: ••••••••••••• Roc:tc Elevltion •••••••••• ~~ •• __ ••• __ _
Coordin._: N •• .l.".l.~.~l9..9.·.1 ••. OI1e Stlrted -••••••••• !;JJ.'If.Ti ....•••....• Overburden Thicknes ••••••••• ~:R ....... .
E •• ~j.l~~.1.CJJ~ .• , •••. DIU Completed •••••• !!/.~!/.fL........... Ground-W.ter Elevltion •••• 1.1.~~., ••••••••
Core Siz ....... ~.~~ ••••• c.5..Q:j. ... ToUl Depth ••••••••••• .5k..l: ............. Logged by _ ••• __ • __ ._P.!A::fl!y ... ______ _
c_ .g oS
• Q,
:10 •
~Q ..,-
1.7 •
~
~ .1.5
If ~
~
~ ..
b "---
~
~~
S.7 -
/"". ~ 10.0--
---
~
~
~
--
Grlphic
Log
I--c' op~ ~ .,."
I
a .. iflcetlon end PhysiClI Condition
Remerkl
(SImple DIU!, WlUr uvel.,
Drilling O\I!rlC1ariltica etc.)
--
/0010 11,0 'os~ ~ 2.7_
I..J:. ~ a /C." 1 fie; ,:1. :-·f _
CQsed. ' _
-.. -
100% ~ ~ ton ~ So,. -
'-~1 ,,/fJl 1 i~<!P 2Y";'90-----
---
-
---------
-
--
-
-
/ooi6 ~ c) k$~~ If".! _
-
-
Harza Englneerlng Company
form SG-Is Date 12./9/7]
i
REPORT OF WATER PRESSURE TESTING
.I ." ., Hole NO.~. __ -=~ ____ ~ ____ _
Loeatlon /.~f-f &u.t b '\ j,f'p
Coordinates: : ~~~~z:.~
oJ -
PROJECT C~ € .,.f~.,.. t~K ...
<..
Angle (from Vertieal)_ ..... -....;::..:.,.'_
Bearing ~ ~ 7 '
Date Started JZ )if
r ' Date Completed 111,1/.,; ,
....
Ground Elevation __ ~~~7u/~.~y ____ _
Rock Eleva~lon .:~ -----=-='--'---
Water depth during test ___ _
Logged by /) 4 ;-,.... '/
Pressure Depth --Meter Ul ra -, .... il) UlO' , 0 .... il) .9 I~ '0 C Rate' I'll >-~ .... il) . ... .~ C ill ... Test ~ .. -'il) Ul E of .... E c 0 E .... --~'O ... ----c.-il) (.j E ... .......
No. From To a" ... il) Start Ene. il) ........ ra il) Loss O'Ul ""--~ '. -... Net (U ....
ra 0' + .... I U Q...o cc ... ...;; .... .... E -0 -.' ft. ill.... Ul ~ u, '
~ .... " '1 ~ u .... (ps l) ... il) (gpm) . I ... -~ « c... --m. ~ U:;ltS .
',' . c.. t.e 2.4 'f. t' '7.'S! f .3.: s " 1eo t:r. fb.J.L Lo~~ IZ .s ~ ,!.~ ~ , .. -~ ).
/Q S" JI..z.s l.eif ~ J,~S .., I f 6 /. ( 2. Z.Xtt:"
2 h.& /1,., q." I.S ;.D 1 , ) 10
" C' Q.3 , J .1 , t'" '1.'2. , y.'2-A -
c.;. '} ·,.b 1 ~-; '0
4 I> Iv:. I . ' (); .. /.,.., -,; ~ , I/"o.,t., I!..d +~ ,,:< /., . ,
. , , . .IJ. Z .; ~'. -, C.t ~ , -.~ '-{.1. 14 2 00 -., . -, -.' -
, .. ~ .. ~ . -:., ~ c c ~ r. --~ 7'1 -274 O . 0 ~ --.. ..
~
/1 , .. 36 .. / lti. Lo' 'I I_~ J. ~ '5 c .. ,. ~.:;i 'S--2'4 (:) 0 ,. ~ ~ .. -
3. '6'1 :> q Q a JI Z. 0;'105 4 , /I. fa -'II '-I 0 0
.. -(' -'5 " lilt "f.1'[ O.rJ 1 O. -.l 2d 31 f' 0 0 ':,.., _. -
Q.30 L{,30 (J,O z. 0.(' /fa 12,' -5 Z « 00
5'.(' ;'0 'i. I.! ',1L ~.7 , 77 ;<--fI.A II )r
. , I (' . , /0""10"·" b,i /.3 I 4ft, 10 ..,.. •• .
J.,' . , -, , p .s..." I( -(I. 1.0 ','I l 7'1 ;g
LLf 4':2 I 7.f 10
Vz. !.f I 7,1, I~ ~ ~ .. ., /1.~ ft:lf 10 ~ Z )lio-3
I
. ..
Depth to g:-ound· ... ate:-____ feet X O.433-__ psi Gage + Column -Frietlon Loss=~et ?ress ... re
* CQLlr1n pressure '= (depth to middle of tested interval or depth to c"roundwater, .... hl::=--ever :'3
smal~er) X (0.433)
":onvers lon faeto!"s: ~u, ft. X 7. 48=qallons
meters X 3.28'=feet
2 kg/em X 14.22=psi
liters X O.264=gallons
:;
HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
Septlmber 1978 PROJECT •••• h.{l!~.:&.c..~~.g:~ ...... ~llJ::!1
Sheet No. I/.£.
Date •• U/..!/.rL.
HoII No ••••• !:~-:t ....... 1! ... 2 .... Angle (from Horizontal) •••••••• 9.:~.: ....... Ground EII • .uon •••••• .1.~.~~f. ........ .
FI8tUrt •• J:..ft.f.f..~ ..... dl!.!.s.. Baring •••••••••••••••• Qf?.OZ ....... " ...... Rock Elevation •••••••••• ~ •••••••••••
COOrdi .... : N ' •••••••••••••••••••••• Date Stamd •••••••••• !!,(.~~ 'AI ........... Overburden Thick,.. ••••••• 9~.9 ....... _.
E ••••••••••• ?:; •••.•.• Date Completed •••• JILI..I/..l!........... Ground-Wet. Elevation iT-•• ~ ••••••••••
Corl Sias •••• J.~l .... ~.~j.... T01aI Depth ••••••••••• $~!~............. Logged by ••••••••• _ ••• flD..r.r.!.Y-..... .
Grtphic t aI c_ Log
.2 -5 i aI R.nwks
i j J a..HIc.tion Md Physical Condition Q (Sempll 0 ... Water L ... II. ; ~ ~ II: a Ja I ~ II: Drilling aw.c.rilticll1C.) 1AoI-·S a: a c cJ
1/ ~ Sl,~~I.. -Po-';;J,~-f~d iqo ell-. G,~~dcQrI~ , -I---" -
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-
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/ -70' ell .... ~ -I5L f':c.\l. . No -~ I~ -
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HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
Septlmber 1978 PROJECT -----(t!..~-Y..f!:._J..!.k.:~ ______ t_Jl_f::!l
Sheet No . .$L£_
Date __ a/..!/.tL_
Hoi. No •• ---!:~--:t-------K---;r---Angl. (fro,,! Horizontal) ________ ~~_: _______ Ground EIIYation _______ 7..~_~·_f _________ _
Future __ J:._ft_f.i_~ _____ C!7.!'s. Baring .---~-----------Q}?-olZ-------------Rock EllYmon • _________ ~ __________ _
CoordiMtel: N . ______________________ Date Started __________ ~I..!,-~Y.. 'AI ___________ Oy.rburden Thicknen _______ Q~_9 ________ _
E ----------"7:;-------Dati Compllted -____ /1.!L~I_-l~-----------Ground-Water EIeYation iT---2'.----------Corl Sizes _____ +-!f:l ____ '...Q.t;J ____ ToUl! Depth ___________ :s~;J: _____________ Logged by ---__________ .!ILt_r.!::!_'f-_____ _
Grephic I tc c_ Log
.2 -5 i tc Remarlu f J j a..ification Ind Phyuc.1 Condition .. Q ; ~ c:) II: (Sempl. 0 .. , Water LIyeI., J! I. ~ Q :I II: Drilling a.racuriltiClI1C.) ..,-'! II: .. :J C cJ
-1/ ~ Sl.~'t...
~Jr~-f~d , -V I4'v ~i-, G 'aA'I~ dcOf"l~ -
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HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
September 1978 PROJECT •• {;.Y..~.te.r: .. i:9..f! .... !.~.t"'-.:.~ ...
Sheet No, dr
Dita •• a-J..i~:r..'.
HoII No •••••••• t:.~::/............... Angle (from Horizontal) •••••• ,.a.~......... Ground EII"ation ••••••••• ~:t~.:r ....... .
Fe..,'1 .J=!'.:f:t •• ~.f.. ... b.~.'.-"". Baring ••••••••••••••• QL?;;;............. Rock EII"ation •••••••• ~.~ •••••••••••
CoordiNlw: N •••••••••••••••••••••• Date Star1ed •••••••• L~;;.!.t{./-1:! ........... O'Ierburden Thick.,.. •••••••• a .... Q ••••••••
E ••••••••••• ?:, ....... Date CompttUd ••• .l!.I.tp./.tL........... Ground-Water EI..,ation ••••••••••••••••••
Core Siz ...... ..IM. ..... ~.wQl ... Total Depth •••••••••• Z.2.:.$: •••••••••••••• Logged by •••••••••••• ..ad}.I.E~.y. ..... .
Gr.phic l~ c_ Log
at RlfMl'kI .2 -S r j 1 a..ific:ation .,d Phy_' Condition .. ¥ Q = Q. a a:: (Sempte Dtta, W.~r LI"el., .II! I, ! a
""-:I '! a:: d a:: Drilling ONIrtctariatia Itc.) .. a :.J c cJ
.. ~/I~-/.Ie1 r;~dIGr'+J G.~ Q t:..,,~ 3.7 ~ ~_~_I'1 ~
~ r ~ (ort I.s:. -) IS sI.w..u. dll'4 +-I, .... ~;.., 0-\ ("0.-; .. oil. ,..r., I... . a..1~1i\ C1. ~ 1-@? ~kl -V --«Z.S -T CJ, '12.S --~
I--
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HARZA ENGINEERING COMPANY liEOLUlilC LUli
Form SG-2
September 1978 PROJECT •• _C.~.~t':._~_f... ... _ .. _LJ.7.J..:;(l ..
Sheet No .• 7'.1..£
0 .... !?.,aLCI..
Hoi. No •• ---t..#..-7..-----L,----;r---.. -An .... (from Horizontal) •• ____ ~t)_~ ______ ._. Ground EI.wl'tion ••• -.-••• 1..'1.J...:t ....... .
F • .,,. .A~.fd ___ ~.'S,. __ .a./..i~ .. Baring •• --••••••••••• Q~z.:.7. .... -...... -. Rock Eln8tion ••••••• -?~~ ............ .
Coordi,...: N ._ •• _ •• ___ ••••••• __ ._. o.u s-ted ••••••••• l/~I-/r./.IJ.. ........•• cmrburden ThickMil ••••••• Q".9 ••••••••••
E •••••••••••••••••••••• o.te Completed •• _._.U 'L~/I.t ...... _..... Grouncl-W ...... Elnl'tion ••••••••••••••••••
ear. $i_ ._...I.tt-J!. ..... -a~.) ... -ToUi Depth •••••••••• ?I..$: ••••••••••••••• Logged by •• __ ••• _ •• .D.~.l.E~.y. ........ .
G,.phic J .1-Log ~
i ~ RlftWka
Iii
f J 1 a-iflcation .. d PhyMal CondItion Q (Sempl. 0 .. , W.ur LeW.II, .Ie! 0 I
& C£ Drilling O\8rec111rinica etc.) w-'e a: c cJ
-, -, FoI(lI~~ Grr:;tvII 0 dto",,:.f~· · c;.. ~1. , -· wi, , -· -I S/'f "·lIy f' ro. ~ .f .. n·f!,,! Jl ,c.,c# p-I -
~ / ~l ,L.~. t1 S l1o-hd ".0-77. o. ~ ~ -
~ 0 ~ -~ ~ ~ " -
~ -----
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-~
Harza Englneerlng Company
form SG-Is
REPORT OF WATER PRESSURE TESTING
PROJECT Ck2S&f-kf. 137tt-Q
Hole No. L.. t3 -I
Location ifff &...1 A-,./J 7J",,~~
Coordinates: N ------E _____ _
-
Angle (from Vertical) 3Q~
Bear ing ____ ..lo..O.<.Jl~l::::..o.....,.--
Date Started __ u~/~~~~-~I~Tul __
Date Completed /1 In/v ;
'" Meter
Ground Elevatio:1 8',,'1
Rock Elevation S~~ .
Water depth during test • 7S
Logged by /J, A! ~¥-
Pressure
Rate'~----'------r-----'r-----1
Depth ..... Q)
0-Q)
I
", >-
Start Ene.
~ .....
Test .c;:;-
"'Q)OO No. From To 0' '" Q) =c'" Lft. Ill.... Ul
.... III m. E-
1 ~;,., «2..r ~,r;, S.lS !:~o
~.lo 'f.Oo
1 ( .00 l~ 7
I ~.1 ,,,.'!>.}
/( •. ~ S' [C;,oC)
"3 .~o "J.n ...
7. ( "to , c:"t
10.-'''' , t. :: ~
14.1s" Ii: .1.S
I1:.Z5 Z ff)D
1, , 4 ( £. .O-g-
, .O~; '!" ~ 5"
~ -'. , ! ': ~,
7. ''1 Cf· 7~
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,
I
\
,
of
LosS
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2,70
2. 7
3SQ
?W
1.' 7
Z.QY
2, !
10
10
50
so
'3 Q
Zo
La
c Q) '" c 0 e .... e. .... w...; -:l -'" Net .:J ..... + -I c..; Q,.Q -0 -.... (psi) u w .. ::... --units
27.1.1
i
/1. ~ '" I ~ ,cr S-, 2.DC{ 20 S.S 411-12. 'r' X fo-'ll
Ii. T 10.35 , 3.L~ qo
{0.3 S I ~.(.£.. t ~L~' !olo Zs. 7 ~o ~o.7 2..7'-10-'1',
ra.UL' '~.~ l.31-1./0 I
~t37 (0 .z.~ , 1 .. 97 2.0
10 z~ I'Z . ( S \ t .~7 7-0 I
It 1~ l~.'O , I ~.s ,"0 S,O ~3.7 Z.Z)'/o·4'1
I
1
I
I
Jepth tCl grou:;d",ate:-. __ feet X O.433= __ psi Gage + Column -Frictlon :"oss=:--let ?re55~:-
\
* C:=l..l1'1!1 press·..lre = (depth to middle of tested interval £!. depth to groundwater, · .... hl::.eve:-10,
5~a':"~~r) X (D.433)
-':-:Jr.ve!":;10n facto!'"s; :=u,ft.X 7.48=gallons
meters X 3.28=feet
2 kg/cm X l4.22=psi
liters X O.264=gallons
:1a~ ""a ....... '"! ...... t;.t;. .. _ •• ..,
Form 5G-:s Ja te ;;. ;-, If?
)
REPORT OF WATER PRESSURE TESTING
PROJF..CT Ci4!sl-lr ~ fA 13Z9-il
Hole No. L 8-1 Angle (from Verucal) .30 0 Ground E I € vat iO:1._---'l!'-'c{L..!i,~ . .!!.,f __
Location).,f{ /3tw t A) " (R, -v) Bearing N I Z ~
Coordinates: N l20~ ;oo.r Date Started I'/157ft
E I!: ~".'i' Date Completed II/"L'fl
Rock Eleva1:ion $'~.
Water depth during test ____ __
Logged by /) J1 ,rr-i 't
.... Pressure Depth ;..l Meter en ta
I---"T--..... '0 .... ~ ...... --....... ---l en ~I c:
Ill.... .9 "1 ~ al .... Rate'~--~--~--~~-~ I
III >-
Il.I ;..l e .• ......
::; .
Q...Q
Test .!: ;:. -• en Ii ;..l~_ ,oj~ c,.-... ..., ....... ,oj No. From To O';..l ~ Start Enci ~.''''! ~
::: c: ;..l ,oj ~ .... 1 tol Ii
of
Loss
(gpm)
c:
Ii -:;,. + .... o' u ..
c: o .....
-;..l ..!.. u ..... ...
~
Net
(psi)
-"I ~t.. ~ .... e-~ ~ u 1 'e:
ur.l ts ~~~~~--~--~-~~-+----+-~~~~~~~~--~--d~~---+~~~
I ~ t.f 10 '-I.b c.O //·0 I S,(j' r ~ 2. L ~ 0 III £,(,X/O-z...
z. ;, l'f,"f IC." 7"1.0 /0
~ 8 1/)._. ~ . ~.5' 'l"(( q. ~ JO
11. Z. 7.0 10
)? 7 7.0 10
'7. (.. ~o,o 47·S
~ Il., if
<? '5.{' '1'.:, '.'1(, 7-C
I c..r:r I~
t. r> 2 L'f' 3" ,..,D IS
I.. ~l ~." 2 0.0 10
j, r ~z/I sO I Z (, ~.?' er.s'!
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., q l. <=toc;c
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o I Z. ~o
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'20
7 0,0 20
. .
I'IS 1,:) I ~ 10-3
II L "/1, 'l. 0,0
II. 'l..
}4,l '-0.0
6.0
Depth to g:::ound .... ate::: _____ feet X O.433 a __ psi. Gage + Column -Frictl.on Loss=Net Press·-:.re
* Col'..lr.m pressure = (depth to middle of tested in~erval or depth to groundwater. whl.::'ever :"5
si.laller) X (0.433) /
C::r.'Je!:':;lon facto~s: ;::;.;;ft.X 7.48=gallons
meters X 3.28=feet
2 kg/cm X l4.22=psl.
liters X 0,264 z gallons
20
22.
Lf
HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
September 1978 PROJECT ___ C.A-!l~/..4..C __ 4K~ _______ !..!.f.7. ___ B
Shftt No. ?.L:: _
Date __ f?-.l.71!
o
HoII No •• -----f..-t5it~------;r------An~e (from Horizontal) _______ f'-:f _________ _
Fe8tUrl _"'_-r_f.-{ __ J:,!Y:_~ _____ 4~!_~ __ a.lring .--------------L:~~-~-l-----------
Coordinlta: N ______________________ o.te StIIrted __________ iJ.J.Jjl _fL ______ _
E ___________ /",,; ________ Date Completed • _____ iJl'.!..] _'-1.. _______ _
Core SiZH _____ .z:d~ _____ ~a) ____ Tout Depth __ • ____ • _____ ~.'iL ____________ _
Ground Ellvation • _______ tr.c._ ~ _. _. ___ ._
Rock Elewation • _________ ~ _________ _
Owerburd .... Thicknesl ________ tt!g ________ _
Ground-Water EIIWation _. ______ • ________ _
Logged by ____________ !J~J1i7:._~_\f.---.. -
Grephic Col
1:_ Lot i~ ~ Remarkl .2 -5 r I 1 CluaifiCltion and "'vlic.1 Condition -I 0 '; Q. Cl) ~ (Semple Dna, Wattr Levlll, • • I • 0 J!O 1 a: -~ Drilling ChIIrlCt8ri sties etc.) &'-I-'e c3 :J < cJ
[( '0· c:.~lo~
~ ~1~c.Ic. Fo~d f4e1 G,t::aAA..O d(c;ol+~ -,.-~~ ..... '+ ... -;1t.od -f -S/1 ~ ./.( 'f +;0 C +u .,.J: -
~ ~~ o.bo~).
~ f-~\.Io .... -
~ -
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~ ~ is\· ... -~\., -
~ 11 d ... I~., -10
~ 1;-SL...-""" -~"'·('(Q·r. -~
> 0 r-30 1=' .. ~\ ..... -I~
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Date --J.0?iJ' n""ML"" t: ... u, ... t:CM' ... U ... vmr"''''' U~VL.VU''''' L.VU
Form SG-2
Sept.mber 1978 PROJECT __ c..!..~_~t~r: __ I.~!..i .. __ .(m.:!J ____ .
Hoi. No._ ••• ~&.:I..,g-... K .•.. 7"' ••• Angl. (from HorizonQII ___ ••••• ~.$:.: ..... _. Ground EI •• 8tion ___ •• $.~7_~_ ..• _._. ___ .
F.8tUr. _k.f!f.f. .. .&~ ..... LtV.~ Baring •• -••••••••• _ •• LlS.~~.r ........ --Rock EI •• 8tion •• _ •••••• ~~.-••••••••
CoordiMu.: N •• .I+z..Q.7,."'.1~_. OR. SUrted ._ ••••• _ •• JJ.j/.l~.r/ ...... _ .. O¥erburden Thick". ••• _ •••• 9.~.f.)_._. ____ .
E _.~4..!.i~+~'~.l ___ . Dau Compfmd ••••••• £l.j.LJ./-Y.( •••••••••• Ground-W.t.r EI ••• 1iong ... t>.r.:t.? •••••••
Cor. Sizn •••••• J;.tr/. .... '-Ba.J ... Tow Depth •••••••••••• k.9.1~ .•• _ .. _ .••••• Logged by ••••••••••••••• ,.tL.&.¥ ...... .
c_
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Gr.phic
Lot
-24-.51. ':.t.i.
a-ifiC8tion and Phylical Condition
R.rMru
(Sempf. D.a. W.ter L ••• I.,
Drilling CNrec:terirtic. etc. I
..
/00'0 Lo SS@ / S -
.
------.. -
----..
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HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
September 1978 PROJECT •••• c;:..f.~).t.(!i':. . .I.{l.I.:..tj ................. .
Sheet No. 1/::'.
Date. Llj'ZI. fl.
Hole ,., ..•••• 5..$.:; ........ -.r .••... Angle (from Horizontal) •••••• ~Q.: ........ .
Fe..,re .Rjf;Jli . .M.~t. .. L:rl.!.S... Buring •••••••••••••••• Qj.~.:r ........... .
Coordinatn: N •• .Jr.~~?.o'.!.t(~.~. Date Started ••••••••• 11./.~9.L~! .......... .
E • .;1:All~+~!-!i ... Om Completed •••• .lll?-.LLTL .......... .
Core Siz" •••••• r. ... ~l ...... ~ .. J .. Total Depth ••••••••••• '-9.~.Q ......•....••.
Ground Elevation ••••••• .!l.CL ........ .
Rock Elevation ••••••• .s-~.~ ........... .
Overburden Thicknesl •••••• Q~.O ..•..•..•.
Ground-Water Elevation •••• JJ.£·.t ... .
Logged by •••••••••• .iJ.~6J..£i:~Y-....... .
Graptlic t c_ Log ..,.
.2 -S ¥ ..,. Remarlu
~ • .a ClaIIiflcation and PhysiCilI Condition o. Q 1 Q. g-o. " = (Semple Data, Water Levell, .Ie! ~ a I I! C
"'-] '! Ii c3 = Drilling Q\arK1ltriltiCi etc.) .. o.
~ lIS c U
.. " J.-0.0-'0.0 t;,1'd+«f /6", ,.oJ,o~;_
~ ~ -/' ~ .... eL.. J.-I--".~ 1r~~'~t. 1"~ I "'~d r ~ ~Q~ -fo:J I. 0 0.-0 -I 60 ~~; ... 7"/~ J li/,d"qit.. r ~,.II~I +. 'l .. "
0.-/.' -I 7o~ ~.~ \a~ .. ca-r •. ~o"'i.+·iJt... ~",.,I,....J by ~,.--... c~.fra. +.~ s 0 -I c'I.,.+. --' I~ -
G~1. S-lri"'f"~. "/~'fIO} 1of'L)r.rlI.I. ~ -0 ~ -~ t::.A /~;-~c ¥ "";",,,, 0;.+;.J, .. C -Sls+o , ... "---q,1 t-'0' $_t4." S~ ~ft.",·'1 ""I F~ S-Io,;" .'.~oj"e --~ ~o· .!>I~i .. · Q 4tot, ) -11 ~ ~Sy IJ,/P) ,; (,a. flf'\--~~/r't (/tit ~ fl.,,, . .. -~ -~ .. ~c~f.t ... -r.o' Qtt-~ -
t f~Y.;" . ~ --.'lo' I"" ~\. 6.0-/2.c. <'or .. C::f~V ~~C./ .. .tN ~ IV) --rive .") 5/_ ... ,";:;; ". ZPI-cf' t;lid-/·i>., ()..
/ {J~ ~~'" ......... -1-4',,"11..,. It_' ~y Gt'l"1. IJ~.II ;".1" -
I 1: ;J6>'O /I. I 40 .c. t ICO +'G'" to-
"""" L 7e'" Ckl~ -~};(,.
~ <i' -. ~~.', ... -/ bQ" ..-~'" ~ r-c:a".r ... !lot!.f .(' r/Q c. ~J( , ~d (S.()-~.3 ,. --.
to-Y fi <H-.. sl. #-,.. P';"CI 0.5,""";" 0./ /tIo~-fly -...,."" f-~ (j.1. ~~ S-I.," ~(J./o~i.,J..~ ~ j ~s. -
~ r 70· ~" lW.~~~·\··
I-2.3-'lJ. 0 !J/'i' #y f've~ "":'-; ~ ~ -
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, -
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. -I ~l ~.f -. -I
II trl~rl . c i IO~I'J...e -a,s ~~ /IA-()'1 -0"1\ j -f~ ~ Isu IA{ Q 1'~. F:. 5~.;" -
f-~~ -(~ ~ ~ L.,., r',~ o.llf'r'l }-t~ c <:)
l-I
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o <:) -" ......... I-.k.u" 11-'c,,(~II'f a. tl.~'i ~\. -
I • 'I' -~ b,;" .$~ 5 ,:, ~ s\C.(.o.a, C/"" 5·h ~ I
roo-~'. -----.
~ -
"~I I Q'
REPORT OF WATER PRESSURE TESTING
PROJECT CJ§t~r fa f~ (!tj9-iJ
Hole No. Lt?_IA L.J. r 0 Angle (from Vertical) _..!../...::!")~_ Ground Eleva tl.O:'l ll'l7, L.I
Bearing I TSo Rock Elevacion 5~ LocationJ.~t l5~t .1<11 (Lo...,)
Coordinates: N ')l01.. .2.".3 Date Started //LL2flJ
Date Completed ')1/-,; /'11
Water depth durlng test. D~ -I
E.3 1!'2.1'~G.,7 I ....
Depth .... ~ Meter rn IU -
I--"""'T---t 0 .... aI 1---....,....----1 rn ~ '0 c ~ .... .3 '1-~ aI .... Test .c ... -• aI rn e
..... ~'O r.. ...... Co-
No. From To ~ ... aI Start Ene: aI ........ IU aI
f Qi':'t;; ~~""I~· ... e _'I mt.. ...l ~ 3 U
1
eo-
/0 ••
2.S' ,
1~,4
'1.0 4. (. 4./., le./ t
r.!..7S "," ,
1-' .-.... . .... '. ~
59 .-~ r
Logged by (:) A, F .... y
Pressure
Rate'~--~---~--~r-----i
of
Loss
(gpm)
,s.'/ /0
$:' It)
S.4 10
4.7t.f
., '"' '/"
7, L..z.
".7~
10
lu
I~
'0
I~ ..
10
IQ
10
c e -.::r' .. .... o· u ..
c o .... -... I U .... .. eo.
10
10
It:
Net
(psi)
c
I
I~ >-
~ ..e...I e-.......
::.I ..
0.-'"
unlts
Dept.h to g:=-ound· .. ·ate:=-. __ feet X O.433= __ psi Gage + Column -Frictlon Loss=Net ?:ess,,::
* C::Jl'.lMr. oressure -= (depth to mlddle of tested interval ££ depth to groundwater, .... hl::-:e·/er
SMa 11 e r) X (0.433)
":onverSlon factors: ::u;ft.X 7.48=qallons
meters X 3.28=feet
2 kg/em X l4.22~psi
llters X O.264=gallons
'IZ
--... ........ ----. . -. -r'nu..Jc \,., I .. J......-;:!!' :.-:! ..... ",'" ... ~ ......... , .. ~ f" ... ~ ... _ ......... ~ .. '=""-' .. " ... _",I;-!' ....
Hoi. No .. },-;{'.d:-. .$. •..•........ _ •..•
F • .wr. A(.'ft.b..!f ... A-..l-'.~ ..•
~rdin.tII. N ••••••••••••••••••••••
~ 0 /""
Angl. (from Horizontal) ••••••• ~.9 ........... Ground EI.Yltion ••.•••••• 1.?L~ ........ .
a..ring ••••••••••••••••• o,.,;?~~ ........ __ ... Roctc Elewetion m ..... S~ ......... ..
on. StII"ed •••••••••• H/~~9.. .fl ..... _..... Owerburden Thicknesl •••••••• aI.Q •.•... _.
E ••••••••• r .. ~;.t\ •••••
Cor. Sizes •• __ ~Xi±!.---LBlJI-)-...•
Det. Completed .• _ •• a~.I:.{ .Cl .. _ ..... _ .. _ Ground-Weter EI.w.1jon1r •• ,. •.••••..•....
Toul D.pth ••• _ ••••••• ~.Q.Q ......••..•.• Lowed by •• _ ••• __ .JJ".a_'-c.':.':.Y-•••••••••
Grlpnic .!! lIf. 1:_ L~ I .j oS ¥ lIf. Remlrkl
> • .a Claaiflation .nd PtlyliCiI Condition Q (Slmpl. DItII, Wltllr L.w.II, • a-S' .. ~ a: :. . ~ ~ I 0 ~Q ] i ·S ! a: Drilling ~rlCUriltiCi etc.) "'-a: 8 .. a u :J c
"" ~liA.f.<&d ~~od;o_+' (IU ~ bo"f,! ) -
l-I ~; 41 -
~ L..loo'
0-, -
0--
--f./3·C--
I -, -, flJ -J ---dl_ -~ 4'~ -4/, ,.€aPo, f<d -t(~" ........ tl.,. Sdf'-'f!ir ,h·,"/' ily -~ 6 .. (\..1-S .It,,, ".. 't ~ \:.c.. .. " cr--. qltS-S$..O -
'I.;' ~.~-+ .. i .. -Iv( d ...... I~f .... d" co{-'i l' L t c.\'\ ... t PLIIIlII., .. --1 '" 1=' ... :.+0 ..... t.::. co.-c:. ~ -~ -~ WI· h.tf'a ... I;:) "'"l -
i't. ~ ~ p'o~~ibl" o~ \...o"'·u·,,~~l ~ +~,. 0 I)...
'-to " .. st. pI. rf.' c~ 'k"_ -\ ,,10. 'p 1.1 t 0 \,~ i '-"Z cJ'7\ ~ o.f' G:, he. -\.\~ .......
\ -
,1
c..1....1 .. ". -
-1o~ Q..n .fo~' -" + . ~,cr--.~ .. ,-..
I-..sl. __ ~l... -
~ . --I --
I-51.0 --
~ , -j c\..l.. ...
~ 111 ~\.~hc.k. -f. ~t..., .....
~ -.
l-I / -. -X f=.~~ ... --10-....... '" -, --
I
I-, -
~ -
I-~ ~ --<:) ~ -v }J c.I .. 1 CI'f
0 -....... ---
~ -------Wll')
TO. (0.0
)
. "
, . -
)
Form SG-2
s.ptember 1978 PROJECT •••• cj!:.~:ifY... .. /.~.t.~ ....... {J.27.::P
Hole No," ••• -'!-.~::.~.l ..... r .. ,. ... Angle (from Horizontall ••••••• ~.9.: ......... Ground Ele .. tion •••••••• i.?L~ ........ .
F • .tur. J:!$.h:L.~ ...•• 4}!J.'i.. Buring ' ••••••••••••• .r~1.~.~~............. Rock Elftftion •••••••• ~.~.~ •••••••••••••
Coordin.w: N •••••••••••••••••••••• 0.1:. Started •••••••••• a/.~ rI........... Owerburden Thick". ••••••• Q •.• 9.. ••••••••••
E ••••••••••• r ......... Date Compleud •••• --'I/....,U. '1:1............ Ground-W.ter El.ydon •••• r ........... .
Cor. Sizn •••• ..J.h.~ .... r..J!.~j... ToU! Depth ••••••••••• i2·.Q.............. Logged by •••••••••••• lJdLI.r.!.'I-....... .
Gr.phic I ~
.1 i Lot ¥ ~ Retnllrkl
; Q. I I J a..ification .... d Physical Condition c3 a: Q (S.mpI. Dm, W.ter Llnl.,
i!! I j 0
"'-·S a: a: Drilling ~rKUriltiCi .tc.)
c cJ
~ r.1:a+~ G~d~"",~. (E1. • bD"f') -
~ . r -,
~ ---zz., / '0 I='cS ..... -
~ -/ ~; -
t0o-l--~o' -
~ -
~ /1 ,,' Cll.w -
~ Ii Q"'~ -ftal r~\.. . .
I
~ -
~ .reI. -
~ -~ ~ ~ -"" ... ~ ..... \:) ~ 100'0 H; Okfi .. e ! 7't ~ I '0' O~, ~ ;:~~I';'"
~ cIa., -
I-I ~ ~~'-T~. -
~ ~ 1: ~L.I .... -
~ s !tL. -
~ ~ ~I.I.I'-A~ II/zir' _
~ / 75' Cl..f ,a,," -
~ IsI.sl"k. -
t-/ ~. \'n -c I..,
to--32.1 • .; I..:' )1·SLtC. -
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~ -
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1'· Ii' L. /..."
HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
September 1978 PROJECT •••• c.!..~.f.~r. .. k~.k..~ ...... (.1 .. 1..2::.(l
Sheet No. Il.~.
Dm .J)../J./IL
Hole No ••••• .l..8.:.?-. .,r ....... A": ••• Angle (from HorizonUl) •••••••• Z!-?~ ••••••• Ground E11Y.uon •••••••• n~~! ........ .
Futun ••• R.~~~:I:. .. .J)~.t..../:tV.\ a.ring •••••••••••••••• ~!.r.;.............. Rock El .. ation •••••••• ~.~ •••••••••••••
Coordin.-: N .7.l~]"..l~!~~.... Ode Started ••••••••• fll.~JiXL.......... Oftrburden Thick ........ 12·.9.. .•••••••.•
E •• ~~l}];.~,.!'!J. .. ~ ..... DatI Completed ••••• iL/.?tl:lL........... Ground-Wit., El .. lItion ••••• ~.~L~ ...... .
Core $ius •••• ..J:ff.!-••• ~Qtll.... Totlll Depth ••••••••••• ft,.O ... O.............. Logged by ••••••••• i2db£C1.Y. •...•.•....
---
2.-
~
~ -
.J i
• CL
1e! .... -
33 -
'f -3." ---, -
-
~
~
r:~
~ f".S
!-
~
/0 ~
~ ....
i-
/1_
...
--
/'-'-
--
~
I,,~
~
f-
~
ii ~
~
f-
~
133
Graphic
Log
f · ~ .. )·1 :oJ ~
/ 6.; :M ..... tl. , .. ~f.i ...
/'111
,
" 8~ f
/qr~~L~ / '0· ; ... fat .....
, , 7<J~
I
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Q ld""~ Co 1\'0..-+,1-•. ~~ \.a..4-,~ t
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o.t~Q visibl. \ ..... CO"'~. flo,',,,,
<1+'1. ) o .. -t"'o t') c.l\~\I'~.f
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fyt'·,i. oc:cv~ \N\~"" Q'*t.,
G ..... .j 1/'0 \\v .....,.... -..o.4~.,...J.
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-troc-,""v.J. . ~ ~,~. 0.' .... ,'"
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o..lo",-; ~o· j t... W ... -t",,-;'j
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(0 c. ~ ~ss t;....,a "'.
7.5 -'0. 0 ~ Qd -t +0 :.I:''''~ty
+If'o.c:-4,, .,.c~.. ~:s 4,\ 1k.Q~~
~oS~,iI( 37 -'$'O I S"-'0,
~ ~,.~" 3'+ ""i""" O.~
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b.,.~ .M..CUS\v-C.. HClv-d o-J..
oS ~1rl'4' .It su~c~~
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O~+&IA-1"~C;'--t cl.JQV';~~ i,+t.
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.. ""'<c.~~"'; S "" ret +.::. J ..c s. fl.oc. t
9~ca.V'Q (1'( .( ..... sc... ( v-ro ~~..d
I"'uc.~ f".c. $~;"",-c:iw...~ +~ ?y.
~ ~~l...
Rlmlrlcl
(SImple Dm, Wmr Le .. I.,
Drilling Q\anc1llriniclltC.)
CaS(~f fQ 1.0 _
. .
--------
---
------
----
-----
-
-
-
Ha~za ~~glneerlng ~omFdny
?"ocn 5G-I S
REPORT OF WATER PRESSURE TESTING
PROJECT cA~sJ.u: l~fe 1399-13
• Hole No. R/! -.l Angle (from Vertical) .rO Ground Elevation
R ~ &...t A: CI Location It I-_l'~
, ,~L) Bearing OIL Rocl< Eleva1:10n ~J:I
Coordinates: N lIZO! 1J..c/1l. ~ Date Started IJ/2onl Water depth during test :!:30
E.3: 13Z:!",Z Date Completed ' II / l./ /'r / Logged by r),;1,"~ 'C.
--Pressure Depth J.J Meter til "1:1 -.... t:J tIl~ I
0 .... 111 S ~ 'tl C Rate· "1:1 >-"1:1 .... 111 ..... .N C C t:J J.J Test ~>-• 111 en e of ..... e 0 e .... J.J~'tl \.oJ.JJ.J 0..-111 (., e. ..... \.0-
From To Start Ene: 111 ......... "1:1 111 o-en ........ -:I -... Net ~ .... No. 0' J.J 111 Loss "1:1 0-+
_.
I U ~ ~ cCJ.J J.J ..... .... E -0 --...
.,Lft. 111 ... til "1:1:1 , til ..... " .t1~, u . .... (psi) ..l 111 3 (,), (gpm) \.0 E-o « c... --m. E-o 'cl.r111:S -
f 2.4 14 / /., I. D'I I. I '\ I O . .6q /0
In 1./ ~ 01 1 0.0 10 3.2.--/3. 'l. C,Q
2 J 3 ~ Z2.tl '£.t.. LO .1.0 2. 0·0 fa f(~ 7
L£L LO 2. (j"O U !'·7 -Z'.7 O.D
!L 2..1.~ 32J lQ."-j~./ Jt..Cf I 'S 10 /t'fj ~)(
! I'! t) v J..I 0 L,,<. '" It.. ~ t. t..'~ ( ,.~~ r lJ "'t: t..c
"z;:)) it ~1. 7S" 2~.S~ " .f' I~ "'t,. .
I
2..2 .. n ,3lJ. tt , ~ ~. L'O ~c. 1< N IS 5' ~.9,1lo-3
S-z..og 4 I~ t, C 7.t. 't. 7 CJ .! 7. CJ 2 0.0 10 I~ -2.~
:~ '.0 ~ 7.. 0 2. 0.0 LO 3"1.. o CJ
6 3S.'f SI. /S., 7. "SS I J.~ f ".'f~ /D i.f ~,I(
g,a 1'1. q ( '.r 10
''1.~ l.S 1 S-I ,.o~ Ie;) 1/,:) 13s ~ /,I)IO-J
'A '-fl'{ SI 2.'-'.0 '.0 ~ .~.~ I~ 2('.S
tt,$ ,. S' 2-0.0 ~o / /, S 4l S-0.0
7 4'9, iI 60 ItU. Lq L.9 2-0.0 20 Jr.!"
~.J7 3.31 2. 0.0 &fv I t, ~ 51, r 0.0 I
:
i
-I
I
J
1
::le;tr. to g:-ound· .. ·ate:-._ feet x O.433-__ psi Gage + Column -Frlctlon Loss=:'eo: ?~ess·.:.r--::
• :.:::L:~:"'. oressure :: (depth to mlddle of tested lnterval or depth to groundwater, · .... :-.:::-.e':e~ :::
sr.,a::~~i x (C."'33)
':'::::",,':e:Sl'::::; facto~s; ::-..Lft.x 7.48=qallons
meters X J.28=feet
2 kg/cm X 14.22=psi
llters X O.264=gallons
HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
Septlmber 1978 PROJECT •••• C.I..~.-t.~r: .. t.~.k!t ...... {.l .. 1..1..:(f
Sheet No . .! /..3...
Den .J). .. ,l;]IL.
HoII No •••• ~.8.:.?"!j" ...... A •••• Angle Ifrom Horizontat) •••••••• ZQ.~ ....... Ground EIIy8tion ••••••• :!.~~~! ........ .
FI.u.re ••• j •• ~~~:I:. .. .J)M'.t..LtV.~ ..,ing .................. ~!.r.;.............. Rock EIIY~ion •••••••• ~.~ •••••••••••••
CoordiMtel: N .?:.z~],..~.~L~ .... Dati StItUd ••••••••• LLL~~iX1 ..•..••..... CMrburden Thick.,. ••• ' •• ~'.9.. ............ .
E •• :-!rl}J:~,.!'f,#f. .• ~ •••• Date Completed ••••• 1L/.?t.l.fL ........... Ground-W~" EllYnion ••••• ~.~L' ...... .
Corl Siza •••• .J:r.r;!-••• J-QW •••• ToUi Depth ............ J..;_~·.J.O ............... Logged by ••••••••• ~,t!J£~.y. .......... .
c_
.2 5 1; Q.
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~
....
...
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,
~t.lo.r ! 70· ~I,d:
, ,. ~" .. ""
a-iflCltion II'Id ""yaiQl Condition
C.O -'0. () F'o \; c.-4-ecl
6r-a d\ Q'r'+. r
I..;~"~ ...... ~ "C"'._"I.. ,,-.., J McJ.
q Y'"Q. ~".«=f ~ ~...... \M..\.""'!I. 0 {' ~ 1""'--
Q ld""~ ~ \':c!a.~IW-•. ~~ \,a.~,~ 't
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~~ \"'-o"'+~YOP "'-J\,",,~
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o.l~Q visi~l. \ ...... co.,. ... f(o~·\ ..
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"",~ ~ 11.1""'" ~; 0 q "'.0"" bl-"'ei.
fyr;f-4 OCcyf""S. IN\~"" ""to,
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o -7.3 c.to~\..,. ~~ ~ ..... -..rry .
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oJ,,,,,; ~o· .i +~ w .... ~"'-~~
toI{ F.. ~'t~\ .... ()J~ ,+~ Cd'fo<~~
(oc.k r\A4.SS ~~"'.
7. ~ -'0.0 ~~d"", +0 ~,:,"~ty
-+..,.~('4-", 't"ltc;\.. ~~ ca.1 .....O~~
""Q!I~'ilc 3 7 -50 ) S C(-'0.
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~o~H'f o.s-/.0 foAIIo;A."(
b"'~ M.G.t!"'oe. H 0. V"d o-<l
oS *~. Sf Su.rfw:tc.~
CCf'tv..~\'( F ... .s+Q.\~.~ ~"'+
o-ff..-1"~C; \...-t (~.\ QV; ~~ i ~ +t.
4(1;~ j +~ ~"IM ~. \..VQa~I.. ... ~~
't---~ k"'; S ~ ~d +~ J J. s. ~ I:.
9 ~ Q \rC I t'i {' rc. s" • r../V"' ~ ~""
f'A. vc. t.. f".c. !. ~....... ct 1.&.01: +~ ?y.
~ Qi'l...
Remerkl
(s.mpll D_, Weur LlMi.,
Drilling CharK1llrirtica etc.)
.
--------.. -
-----.
---------
-
-
--
--
-
-
-, <ffJ l~-~ ____ ~ __ ~ ______________________________________ ~ ______ ~ ________________ ~
Harza E~g:~eeri~g ~omFa~y
For:n SG-Is
REPORT OF WATER PRESSURE TESTING
PROJECT CA~S~,. ia.fe 1399-8
• Hole No. PI! -.l Angle (from Vertical) .10 Ground Elevation
R I &.t A: o CJ Location It~ .f. _~I~
, I~I.) Bearing '/2.. Rock Eleva~ion J;}
Coord~ na tes: N I) 2 0 7, t{C(I.I. u Date Started "/2oRJ Water depth during test :t.5 0
E .3 I 13Z t 1,Q.Z Date Completed f 1//2.1/.,1 Logged by tJ, If, ,..~ '(. , --Pressure Depth ~ Meter til ~ -.... IlJ til 0'1 I
0-<11 s.>4~ ", c Rate' ~ >-~ .... Q) .... .C"j c c; .....
Test ,.c>-• Q) til E of .... E c 0 E .... ... ~", 1.1 ...... 0..-Q) '" E. .... ... -No. From To 0' ... Q) Start Ene: Q) ........ ~ Q) Loss 0'1 til , -:::I -... Net :J ...
~ '0'1 + -. I U Il...:l cc~ ... ;;--E '" t1 ~I -0 -.... Lft. Q) ... til ~ U 1 I WJ .... (gpm) c.; (psi) .... Q) E-o • 1.1 --m. E-o -~ units
I 2.4 ~4' /J.' J Dil I,~ I O.O'J ID
/, I ~ Ll"L .01 1 0,0 /0 3.~ -/3. "L C 0
7_ / 3 ~ 2'.4 G 1.0 1.0 2. 0·0 If) 1r.7
I. ~ 1.0 2.. ~ .. O lAJ ~,7 -Z',7 o l'l
if 2 /~ .~2.1 I{),L I~, I Ii.. ? ( ,~ lQ I-fj ~)(
i~ 0 If J.-I 0 L ,,<. ~ II...~ 2.~ • .,~ ( ,.~~ (6 _~ ~
.LPl .iI 2.'2.7S" 2 !".~~ " .f'
. . , 10 ,.. >
~ZS! JlJ. tt I " '1. ,7:1 ,...~ J( It) IS 5' ~.9,1/o-J
S-z..~ 'f I!~ 0 7~ ? 7.0 .! 7.0 2. o.c 10 12. -,~
" .,. a ~2 0 2-O.C LO 3"L. o CJ
b 3S.'1 SI IS.' 7.~S , J.~ I J,.l(~ If) ~ "rIC.
g,B 19.Q ( '.f 10
1'1.t:t LS '75' I ,.o~ Ie:> 1/,:) I3.S ~ 1.1 )10-3
'A 1..(1.C( Sf. L." '.0 '.0 1.. 0.0 I~ 2r.,S'
9.S T...~ 2-0.0 ~o I/. S 4/.S 0.0
7 4'9.'1 60 £0.& LCf z..~ 2-0.0 20 Jr.!,
~.37 3,3' 1 0.0 ~o I I, r 51. ~ 0,0 ,
~epth tC'l g:-ound· .. at.e=._ feet. X O.433-__ psi Gage + Column -Fr~ction Loss=:~et ?ress·..;.re
• ':;::l'..:r.:i pressure = (depth to middle of tested interval £E. depth to groundwater, · .. r.:::-:e':er .=
sr.1al:er) X (C.433)
"::x',ve~SLJn fa~,:o;s; ::u,ft.x 7.48z gallons
meters X 3.28=feet
2 . kg/em X 14.22aps~
llters X O.264=gallons
HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
September 1978 PROJECT ••• c;!~?~.t::. .. ~~j~ ...... !.~?.r.=1$
Hole No •••• LE.~!. .......... J.-.... Angle (from Horizontal) ••••••• Zg.~ ........ Ground Elevftion •••••••• ~~~.~ •••••••••
Fe8tUre .K''iJt.~t. .... !T~./~ •• Baring ••• ~ •••••••••••• Q.9.~.;' ............ Roctc Elevation .•••••• ~ •••••••••••••
Coordi~: N ••• ~?.9..7".~.'E~.~ .. [)Me StIImd ••••••••••• tLi,¥~Tf .......... Overburden Thick ......... Q ... 9. ••.......•
E ••• ~ .. J.l_2.~.!1!:_~._ Date Completed ••••••• .!I.ii-..7.;...ft......... Ground-Wet. EI .. ftion ~ ••• Il~Ll .... .
Core SiUl •••• .,J;.M. ... L.8.l4.1 •.• ToUl Depth ••••••••••• ~ ... 9. .••..•..••.••• logged by •• _ •••••••• (Z!a~E~¥-....... .
Grepflic i l/l .1 i Log
j l/l Remarlu
; Q, f J 1 a..iftation end Ptlysicel Condition c3 Q (Sample D8ta. We.r Lavell. ,Ie! I • 0 J .. a: Drilling Chareeteristic:s dC.) "'-I c:i c3 :S cJ 0
-/ , .. ' f: <)J . 0·0 -SO.f) fi,/id-/4t:/ G~.d,'or"+4
CtJs'·r -fa /,0
.
~ I~ qo· -#. 0,_ 1.;, t.,. ~,ll. c;-.y J ,.He! 1'1'0"'".'-~ ~ -
~ -f'o/~+At( ~~~.,. ,,-,';"'s ~ ~ -o~ p f«'"l (0 'UCl.~-h J 0 ,-+1.. 0 (?) ,e UQY' ~ ;-;. ,,~t. . . I -
I--1I'1~,'I,,'f" 0'\1'( f"'\,\~ ~\Q+':f. ... ~. --z;, i~ "or'II ~ \-cLe. ~\~t~ J-.... ,~ ~ /1' ,~ ~s+c.;. -\ 1-~"1. by S~Y'\'~~", ~ o~ C.\...(I:,If ~ r-rllll .. 1 1100 0 ~ ,3,S' IlJ -, Ju c.l' •. ~ .",~ , We l\ ele -.r .,"-' t-/ vr' f.\-4-.; ... C,.rI'4. -
2.
'"" ! ~ c\.-I .. ".. \;... o\,j-t~ro~. -SI.SI.tt. . . ~ I-i2~~ -~ .~ ~ ~ ..... -
" ~ V 10· eLI .... I~ I"-Q -r-
~ --30 oS I. UoIIl. +t.. -
~ / 1/$ (' 1..1 0 ... -
~ / ,.,( -
~ t,~ .
I-N.oc:H-001.41., of'r-.c +'-J ,,~d 0.0 -tt.o -
~ ffq~ p;.(:e O'~I"~;'" ~ 0./ (f.fr.:.s,+ly. -
0 ~ --3Du 0·3. ~+l.:a-.l • ~. s~.,.;.. .... f""" ~ ~ -
I-j-t~ !'fow:{ f ~f-rp., ~ It; -Q --1'-f." .... ~/y ~o 5/;"1. II., ~-Iu~ ...... -/ ~ Sl ... ~.i ...
~ f;.~,:.. '/,o-,S"'t) 141,+1... c (."#c{y ~" .. , ~ -z. --~ # ~'U:.~'" I'~ +.~lIG./f (!! 12) 141) /T. Zl -~ ~ Ilet p ........... IJI~, A.~( J j/!. ,41 • .,. fi~~~ -
~ l!l.~ -/ ~. <..I..t... f ., IJ /II( wI -' -.• ~-f" /'1,,,,, ./ 0 Y 0 . .5-
I-~ 10' .s'.~~ I . .J/. )1--" ~ J~~...,.", . Fr-es &.. -,...... ~ ... ct.; ~ f~ + -. ""....... ~ ~>4r~y 4$
l-I so· i'"(.\w. A.o~U (;.(,~" jt.1. 1/0""" j f~ ~ -
~ ./ cit (" .. ,'-1., .• .,1-F .. .s.-ftl,",.,,_ -
r-OCCO' jl.lC!4fl... +.J S/. ,.,. ... tL...¥'~ ~~ -, ~ I-
-tt"U". $ • .(' c/.y. fQ'~f,;.. -~ t "O'l'"' ~I~ t-V ~cr ~\., pl ..... s , __ v_.((\j 5-1--"5 ~ ~ -
~ / 70' ~I._H. 6~1!-. -"'10'1
~ / r.O ~ .. ·(1·1 -
~I-lL 7! 'Tr '~t -. s,.....c~\... .
~ 0 f-st.r .. -
~ 1I -
~ -,..
Harza Engl~eer~ng ComFanj
form SG-Is
Sr.ee: ~,: I
::late ----
REPORT OF WATER PRESSURE TESTING
Hole NO. __ ..;..R~B_·_Z~ __ _
Location II; 1+ ' .... rAt ,~
Coordinates: N , 2.07 '''(.2 , ,
E .3 1~1.'4~{" , . -
.-
PROJECT cl1~J-I .. ~ k f4. Iff'! ."
Angle (from Vertical) ZlJo Ground Elevation_~j?~~_O_.~I ___
Bearing ________ O~/u~~a--~---
Date started ____ ~/~4~/~Z~~~!~r~/--
Date Completed JI /lS' 1 TI r-, .
Rock Eleva~ion 5~
Water depth durlng test Dry
Logged by f), /I ~'/
.....
Depth ... Meter til ", .-Pressure 1 ..... ~ tII~ .
0 ..... ~ S ~ " C Rate' ", >-~ ..... (II . .. .N C !;; ...
Test .1:. ... -• (II til E of ... E C 0 e .... ... ~" ",'" ... 0..-~ . c.. E . . .. ...-No. From To ~ ... (II Start Ene: (II ........ ", ~ Loss C'tII' .-;::I' .-... Net ~ .-
", 0'1 + ..... 1 U c...Q -C'" ... ' ..... ..... E -0 -Lft. ~ .... til ",;::1 I tW ... " ~ ~I u ... (psi)
...l ~ 3 WI (gpm) ... E-o « c... --m. E-: ~ ·.lr.l ts
I #, 7 n,J 11, '.7 .ZH , /.JB /0
"1~ '1.t.! , /.~7 '0
1.1r IJ,,~2 , I,~ 7 10 3 7 2.s 1/. "L .s.7xIO'4'
2 12.. 'I 2.3 10.6 ~ ·~I ~ .VI( I l'l.o"\ 10
? . <Jf:CI ,.~ C. O.Ot. 10 7-2--) 7. 1-2S't 101. I
3 l./.tI ,), 10.' S.3' r:. . ., " I I.I./L Ir.)
t:..7'1 x. "1. "7 , ,.~ 1 , 0 n'-l'l:tla-If
'137 10.'" 1 I,~ z. Lo 10.t. ~ c l.7.(. f.3MO~
/0 err 1'l,JL I (. ~ J ,c
I Z .! L II,;'. I I / ~-, Z. ~
4 J/.r t{7.! I~.' 3'.UI S.21./ 2 0.0 2.n
$'.'13 S. 40 2-l).o ¥o /2. '--0·0
,.Z 7 S.27 ~ 0.0 Zi:1
oS ~I. JI 60 I~.(. 7.s Z. I.St , C:>.C:> IS"
~I '!'f ) 0.0 !o 12.~ -o CJ
7.Y 7.f 1-c:).c (~
,
Dept:-. to g=-ound'",ate= ___ feet X O.433-__ psi Gage + Column -Frictlon Loss=:--iet ?~ess..:.:--?
• C:)Llr:'~ oressure : (depth to mlddle of tested lnterval or depth to groundwater. whl:::~eve~ l"
sr:1a::~~) X (C.433)
-'::):'.·;e!"'Sl:Jn fac'.:o~s: =u.ft.X 7.48=qallons
meters X 3.28=feet
2 kg/cm X 14.22=pSl
Ilters X O.264=gallons
( ,
HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
September 1978 PROJECT ••••• !:..!..<':~ti'r....~.t!J.. ...... (.J..!.?7i!
Sheet No. ~4'i.
O.te .!.t(.;.JEl.
Hole No';:J ••• f-4.:L ... r:".'A-:' •• " Angle (from Horizontal) •••••• Z9..~ ......... Ground Eleyftion ••••••••• ~~ •• l ....... .
Fe.cure f':.~~ ••• t .. ~t: ••• ~.,."4 •.. ing •••••••••••••• O~Q:;~ ............. Rock Elft.tion ••••••••• s.~.~ .......... .
Coordinn.: N •••••••••••••••••••••• One Started ••••••••• Ll~~.'/.;n ........... Qyerburden Thick.,.. ••••••• 12·.9.. •......•
E •••••••••• 7': •••••••••• Oft. Completed ••• .JJ.I-l..l/.If. ..•....... Ground-Water EleYl1ion ••••••••••••••••••
Core Sizes •••• 4...&2 ••.• L~.al ..... Total ~ ••••••••••• :5:.9. ... Q .•.••.••....• Logged by •••••••••••••• .a,tLfi:~¥ .....
Greptlic t .. c:_ Log
.J -5 Ii .. RIINrkJ
i I -! Claaiflcation Iftd fltiyuCilI Condition .. Q (Simple Date, Water leYel., j! c:I cz: c :I a I ! cz: Drilling ~r8C1ltriltlCl etc.) "-I-'e a: 8 ..
:J c cJ
~ ~. e,.1..\..w
~ ;;f,;'-I-ut G ro-od,drr;-I~ ~ ~ -
r' t --'4s c60~) ~ 0 -
~ V ~. (~IQr 0 ...... ....
l~ ~I ~-rl. -
~ / '0' c'Jot. 0
~ "'~. 0--
I-~\~I...~ 0
'It-V z,i c.~foo!.>4't·~ -SI.\IoUa't1..
l-/' ~ faler -
~ & ~·~i .... . . -
~ .
:1 II~ k.L\e~ ~ "l-t '0 S"-~ ~ -I~ \ '0' ~~~~, 0
0 I-0
(t" "" ~ I 'Tt -I
~ I
ZI-/ 10· c1.1o.,.. -
I-
~ -
l-.
~ S'CJ,(J / If"; LI~
-T.D, S"O.O
------0
-, -
~ 0
~ -.
~ -
~ -
I--
~ -
~ .
I--
I--
~ -
I-0
-~
~ -
..,.,-.. " ·.v. 'r--=-.-~"''''
Om _I.U.z/.~J. Form SG-2
September 1978 PROJECT ___ t:.~:t..~'!: __ b.t.~ _______ !_~_"t:r_:g
Hoi. No •• ",.-J~-~-:j-_-~-----L:..-------An .. (from Horizontal) _______ ?Q~ _________ Ground EI •• won _____ ~~~~ ___________ _
Fe8tUrt _!-_L~j._t ___ ~_t-.. __ ~_~~ ____ Baring • _______________ RfXJ~O--------------Rock Ele..uon • ________ ~_"'f?. __________ _
CoordiMUl: N' ______________________ 0.. Shrtld ---------I/lre'-'-_f/ ____________ Owerburden Thick,.. ________ ~t9. _______ _
E .p---------Tl'---'(,-----o.te Completed _____ I.LI_~J. _1~ _____________ Ground-Wftlt' Elftl1ion ----------.-------
Core Sizes _____ *:i.tI.'-----.a:.G.;-----To~ o."th ___________ ~ .. _Q. ______________ Logged by _____________ Ii.!jJ_·_~!"!?+-------
Graphic J #. c_ Log
,2 -S ¥ #. RIftWIu
1; ~ r I 1 a-ification and Physical Condition a: Q (Simple Oltt, W.ter Lnell,
J! I ! a
",,-1 '! a: a: Drilling Q\ar..:t.riltics etc.) ..
:J c U
(J
-~ ~. <:.lbr ~/~f~e/ ~~aIc;'ri-!~ -J\ SIc.k.· -~ ~ t\'.v (12l 4c;,.,~ ) --Sl. .... ~ -
~~ Z2.0--
~ I--' lo~ S\.-~ -
I--
~ -
l 'I_ I ~ .. c.~I_. -JL .... ~ .e '# --, ~ I. .fel, 0 ~ -\::) . . -....... ....... -,-----/' 1ft ct.(Ot' ----zoro -k·\ ~ -fo~Ul~''"' ---/ ~! ..... ~ --...
::.,---.. -
.... ~ If)' S\ ........ h -
---I-o· ~\ . ....-.~ ~ ~ -32. --~ ~ I ~p.f' ,~oa (i. IN ~ \) U\"; 1''--I 1Q-ca~l.. , . .......
I a.i, \\\~ \\\27/(1 _ -./ ~f ~I,w $_'-""
'f --.
~ -
l--
I ~ '-" C~,.;" ...
'-~'~~ ~ -~i,.+.;'" -->7.0 ... / SC' ~L.I,,~ -~1.~4". ,."",0'." If ;'/~ ~ Ie ~ ~ --S1, ... ~ ,/' IJD' ).ro~ful • .,. 37·7 -)-op-7) --
I--
/ SO· ~c5~.i ... -~
HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
September 1978 PROJECT •• _ ••• k.6.tf.~.~.~. __ !...c...& .. _ .. Ll.9.1-8
Hole No __ .~_ •• f.~_:~ ... ____ ._ .. _._ .. _ Angle (from Horizontal) ._ ••• _ ••• 7.9_~ •••••••
Fenure .J:. '!'!ll.i.~.t.K. __ .. ____ .. __ .. Burin ... ______ • ___ ••• _._{-j_~_;..;-.. _. ___ .. __
Coordinates: N •• ~_kR7+~?~ ... ~.--Dete Stamd .-•••••••• t? ... 4:f,.l~ ... -.--...
E -A"-'19.£ 7 k'~i--.---o.te Completed •• __ •• _a..Jj _1:1. ____ •••• _.
Cote Sizes • ___ Z ___ ~_._ .. C_Q_t.__ Tota Depth ••••••••• _.l$.. ... ___ ...•.••.• _._
c_
.2 -5 I! Il0l-
Gr.pflic
Log
Ground Eleyetion " __ '-?_!~"'~"""""" R~ Elewn~ ._._~'!!!!~._ .......... _ ..
Ow.burden Thickneu ___ ._ •• Q~.Q •••• _ •.• _
Ground-Wnw Elewa1ion _.e.~t .. :'~_: ..
~ by • _____ • ___ ~~_~c.;_~_ ••.•••..•
Remarkl
(Slimple Dfta, Weur Leyell,
Drillin .. ~rKtariltiClI1C.)
C~----~--~~~----------------------------------~~~--~~~~------~----~ I ,P,.., r tV 1'""'0 s..atP a f _ l-
I--
I-
2. I--J. q •
l-
I--Z.,
~
~ ....
~
I--
I-
, I-----
f -
~
I--
l-
/o ..,...
l-
I--
~
fl.~
I-
~
I-
J'I~
I-
~
I-
1& ..,...
~
..,...
I-
/~ l-
I-
..,...
73
15.3 •
<' -35'.7
i..-Cl"l Cc) • ~ ~ eI,;"",:t-4' I
VAr, ... J.fe I.~L.~ If .... " r. cd~,~· .. 1t1.f4
,;.. (Q{OIl"; Ct;/ur 1/CL,.,e, """f£...
a;\1~ Gil 9 4 Z. 0"-d",<;r#' ~f
~ -( /"'.,,;..~ -'" ~ d. f". / ;.,;
It ..,·~/II .( "lIte f",.-.ttI -QtJ~n
SJ...4,.red &1t sid._~/.. ;1t~IP'''''''''
~~ """",,~. ~ftJc.rJ of a. rt.
~tIf( -fe It:ll~'" 5 .... /.,...1., ""'(,, ....
Ch(Qr ~ ... t"C.5Sa-ry f'l'''+~
~_I(., 5/'5'ffy ~fL.,.eeI
;,,(rl ~+t..~ ~ dQC""'~Sqd
/v.. fll+{!rVII /s G,s 1Ifc.-+ .. d,
j,Vl4fk..-u:l,;.J..vvo./C 1,!I~oIJj)rfl.
, , -/
0.0 -J. Z.O ClQSely FrYAC"",",'~d,
~tV( ".~. ~.r' '" I~ 40.1
/tiosfly O.l' -0.1(' fI-wf #U14~
$ +~, Sf. -f~ ;. /1 (('1 fJJ-'¥-f~
.::l1(;1l~ j+s, Fe S' t.. I~ """"~ .....
~ j ~ '\oJ~';' ~. :.. G ~ 4 , , lICk
..a-. s ;de.$. 1#_-11.","1 o+-f--
11-0 - / ,. , \UQa~ L..~tI +.
"" ~"Cfllt.ro'--' 4~P. a.t~ .-+~4;.
I(f-C;"\-c~III~_''''''. c .... )1"1
\(fe~ af"~. S~ ,:,.. .. cC'~ ... 13. 'f I'." SI. deC4-". IJ. & .. t ..... (~ v~
rt~.
~I't Q.(u...~ \+ t'~~ s.\d~,
'''''~.a f'od: ~o., \ ~"".,..
Q~ tlct .. tI.
~.
5u("(.C .. , _
~$~ t /,0 f'1. -
-----. . .
I,; flU" ~ftrY~$ -:
,~elV" .. 1 I()~r;. of _
ClrcU/d..f,';"" /;.. -
fa, /0,0-(.1 ,,-{ J(j~ ----------.
-
-----~,,/Iu ~ e Id ~.,I.r 1/0I1i (
CQ IIi;,; a f It.S _
-
-
-
-
-
Harza E~gl~eerlng
Form 'sG-Is
!-Iole No. f~-I
Location pcwS t.,t
REPORT OF WATER PRESSURE TESTING
PROJECT ('k~v,k r~
:::a:.e
I -'_
Angle (from Vertical) ZO°
Bearing ______ ~/.2~/ __ O~r_------
Ground Elevation---'=O~~w~~L~ __ __
Rock Eleva't:ion ~ ~,
Coordinates: N 1.2.07.3 I 1·7 . , Date Started IZJ, /rz Water depth dUfjrin? 1-~st ~ry
E 3 lSI 7sC/.' Date Completed Illt Irl Logged by A., ~ ~ I I"" -J --I --Pressure Depth ... Meter Ul I1l -.... QJ UlO" I
0-QJ S )Cj ~ '0 I:: Rate' I1l >-~ .... QJ . ... ·N I:: QJ ...
Test ,;:,""'-'QJ Ul E of .... E I:: 0 e ....
... ~'O loco ...... 0..-QJ :., e. .... ..--:::l -No. From To S'... QJ Start Ene: QJ ........ I1l QJ Loss O"rtl " + -' I ... Net t:; ....
-I::'" ... '-..... E I1l 0" -0 -'-.l o...Q
X ft. QJ.... rtl 11l:1 I c.J .... '" ~~I . ... (pSi) oJ QJ 3 U
1
(gpm) u loco --Eo-.. u.. -----m. Eo-units --
I ?'tI IS ID. {., if. 01 , .'2. I 2.&.1 '0
f~, I~f f{ 0 C.1.1 7.'11 I 279 '("j
, ,) 0:-~ 3 t ~ q.~1 /l. If ( ~.lO fO 32. S ~.L 7.ll'a~
. .
I
1
I
J
I
j
i
I
;
I
~epth trl g!'ound;.-ate!' . ___ feet X O.433= ___ psi Gage + Column -Frlctlon Loss=~'e:. ?ress·..;,r.:=
• :cL.lr..n pressure -= (depth to mlddle of tested interv.ll £!. depth to groundwater, w:-1l::;e':er ~
s::-:a::er) X (0.';33)
-":c::-,ver:51:Jn facto~s; :u.ft.x 7.48=gallons
meters X 3.28=feet
2 kg/cm X 14.22=pSl
liters X O.264=gallons
Ha~za E~g~~ee~lng Company
form SG-Is
S:-:ee::Lo: I
Ja te /Z/u--:;;-
REPORT OF WATER PRESSURE TESTING
PROJECT a@5/~r kfe /5?~-tS
Hole No. ff-2.
Location ~(A:" -luI' I( .
Coord~nates: N~. "Z
E '3. I ~.;; I' 9 , I • -'I -
ZO O
Angle (from Vertical}~~~ __
Bearing 123 CI
Date Started (2../£ IT!
Date Completed / iJ!/YI
I
.....
Depth ... Meter til ~ -..... iii :Jl0" 0 ..... ::.J o 1t:Jl '0 C Rate'
~ ..... ..J .. QJ . ... .t'\j
Test .t::.""-'QJ Ul e of ... e ,oJ~'O .. ,oJ ,oJ 0.-QJ (,j
No. From To ;r,oJ QJ Start Ene. QJ ......... ~ QJ Loss O"Ul'
~ 0"
Ground Elevation 2. Il.S'
Rock Elevat:ion S'eut ~
Water depth during test _________ _
Logged by /J.1t tw:;i
Pressure
I
~ >.
C QJ .... C 0 E .~ e .... ........ -:::I -,oJ Net QJ .... + ..... I u c....Q -C,oJ ,oJ ...... ..... e -0 -~ft.
QJ _ Ul ~:::I I "'-l .... (gpm) " ~ ~I u . .... (psi) ..J QJ 3 U
1
..
m. e-e-.. c... -----un~ts . r
1 3.l. 2DJf 17,' /. c,y ZIt) j S.?' 10
7.10 1.5,00 I s.9 I&J
/3.00 Ir. 71 / ~ll/ /f..J 1(. { /2,:;-2.0 ~. '{,(IO·'
L 2. 1.'1 37.~ I~.r. 2.m:> <f.rD I 7, '0 Zo
9.m It.. 7 I ~, 2o
1("'.7 .z ~.I I ',0 2'y , 2.. l. J~ It. 1. • '1. '1,( IIJ ...l1
J
I
I
I
J
\
Jepth to g=-ound· ... ate= . ___ feet X O.433== __ psi Gage + Column -Fr~ct~on Loss=Net ?ress'-.::=,,=
,. :2~'J:"1~ pressure = (depth to m~ddle of tested ~nterval or depth to groundwater. whl:!",eve~ :..0,
s::1a:":c~) X (C,433)
"':or,':e=s:.on facto!"s; 2U, ft.x 7.48=gallons
meters X 2.28=feet
2 kg/cm X 14.22=psi
l~ters X O.264=gallons
"At1~A tNYINttt1INy \,;UMP'AN T uCULUUl1.. LUu
Form 5G-2
September 1978 PROJECT •••• (!.~.~.!.~t:"...jP...!.li ....... .!3.i.'1..8..
:>neet NO .• -:-:'.~.
Detl.:-Y..)/.t! ••
Hole No •• " •• ~.-.~ ••••••••••••••••• Angle (from Horizontal) ••••••• ?<l.~ ......... Ground EleYetion ••••• ?L!:.~.r ........... .
Future .t: .. ~t' ... U."'..4 ..................... ing ••••••••••••••••.• f.?-..~~ <:. ............ Rock EleYation ••••••• 5~~1.f ............ .
CoordiNlta: N •••••••••••••••••••••• Oate Started ••••••••• ~?.i.3 .. .T.L.......... Overburden Thick". •••••• .9".9 ..•......•.
E ••••••• _ •• r .......... Date Compfeted ••••• B.Ll .AL........... Ground-Weter Eleye~ ••••••••••••••••••
Core Sizn •••• ZIlX.... !J.~J._ .• Total Detxh •••••••••••• ~.7 .............. logged by ••••••••••• ':.tLEt:.y ........... .
.1 i ~ Q,
.!~ ""-
Grephic
Log
Claaiflcetion end PhysiCliI Condition
Rernerk.
(Sempfe Deta. Weter Leye' ••
Drilling CherlC1ari .tic. etc.)
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do,~( y .(.,.a.c. +u .,..cJ. ~4.A
I',ftc. ,.z.' /IA /"'. 0.1 Jfl06-fly
,?, S' D 15"~ « " ~ t:'....c.t. ~\I." ~
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O...; ..... +G-t~ eof=' ~Ie . .;.~ j'f .. c,.
fla vrI' ~ ~ ... c"" 1 . F"',.., I. -fu
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a..w:J 0 ff.-.,. F ~ s -4a , .... ,J .
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af
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· -
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~ds rt.CCl/f'Nt!. _
-
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-
HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
Sept.mber 1978 PROJECT ••• cj~~/:.~~ .. ~.~.t~ ..... !.';'7.9 .. :/3.
Sheet No .•• _ ••• 0.,. _.'.~L;.~:: ..
Hoi. Nto ••• r...~:t. ............. _ ... . 70° Angl. (from Horizonwl •••••••••••••••••••••
~n, .... " ........... l.1f.l.: ............. . Feature •• f.~.':}.~~: .! ............... . ~ StIrttd ••••••••• i.;t'ItCJr.l. •••••••••••••
o.te Completed ••••• .!.~./.lJI!. ....•...•...
Coordirwta: N' • .l~~£1~lJJJ1 ... .
E .J..~1~',1~~<.' .••...
Cor. Simi •••• Id!...t...~~ ....... . To~ [)tpth ••••••••••• i.~.o .............. .
c_
.2 -5
j" "'-
t-0.$·
I--
t-
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t-Z..S'
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I-
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'r-,. ( .
~ --l' _
---
10 -
~ 10.3-
t--(().~:
11.0
t-
Il ~
l-
I--
~
N'r-
t-
V 10 ~. r.~; •.
i,...--' ;>0' 3\ L ~ +.~'"
'-7, ~o'" /'#< ... ~~~ ..
/1 '0' .f;,I,
~~CI· f'.~~.'"
Y 3."" /,,,, ~"l'"
I--0 0 c~I" .. !SIr, 'It •
I
I ,; G",-
1-
a..ificltion ..,d Physical Condition
1-ta tk~ ~.l '1 F'v~c.~...u:( J '/ovt.~
~I·.~. 1.3' M ''''' a. /' \I.<.~+I'Y
o.s' ~ ... .c,r.c(.. Brie,!. f-k; .. ~
c",.d s.-+,o<; v"fI "" ..... ~/~,u:I. T-+.
5" ~c f"~ lJo..t't l... ~"r~ -F. I I-f #'4 •
.5+~~, .\\'''~ Sclt..e }-h """-'~ t.._..t.
~''f/J.''''<-t ~/~'S I. -f4C ..f,
Q.o -IS." FoI,;'.s.~ G,.v·h. O,Q"I~.?
I'.,.J -An-pl. 1""( ,~~ ~ 1'fI1~"'"
plO<j'. P T 'Z.) 0 r~L.~ J ,,~ f .. r . ..,..I,
pu,.yI~ ""~ (;> ~ A"~ ,1((1 If c. ~
(J bo~.1 F-s l,
/l.od-l-I'~ .. t of ,I-f •• ;1"Cft~ /.l'
/'4,'", I!J.I' "U\f'fy ~. 'II $~ JIU(./f
h rt, .sl', I~-IS' H. wi (
.s -t'~1 . ~ ~ i "'"" ---fL.. If f t/~
~-f'.."~ 411.iI .. ~ ~ j .f,.
Ground EI ... tion ••••• 'R~:.h .......... . R~ EI .. ~ ••••••• ;r~.~!:! ........... .
Ow.burden Thick.,. ••••••••• '/,-09 ........•
Ground-W., ... EI •• ~on 'f:f.{wf.Ci •••••••• ~ by ••••••••• ~.~ •••• !.)(. •••••••••.•
Remarks
(Sempl. 0.,.. Wdlr Ln.I ••
Drillln, a.nc.riltica etc.)
-----I~o'l) ~a t~ @ !.7_
-
'. -.
--------Sa-jJ/~ lo.~-IO.~ _
----.
-
13.0-/S.U ~s·'~' •
~ Rec.. grlcc; (o .. ~ . -
Claye't ..;.,,~ "\J~+"''It
IS ~ 15-0 ~ ..... ~-4-~--------.......... ----..... ------.................... --""'--~-+~---~+---""''''''-------'''''--'''''~
t---
l-
I-
I-
T/). IS-O
---
-
-
-
--
ror:n SG-:s
REPORT OF WATER PRESSURE TESTING
PROJECT CAf!.J~V" /4 t., 13~t;-B oj
Hole No. t E -I Angle (from Vertical) 20 Ground Ele:vatio:i '?'~. 3
Locatlon <c;'.J BaeK )4$1\ (L" .... )Bearing j),u: Nlltfl, Rock Eleva~ion ~
Coordinates: N ) Z07 ~'O.o Date Started II/Z' /7"1
)1
E ~ 1~2 cB!·l. Date Completed ',[l7/r l
Water depth during teH '±" .... 1
Logged by iJ A fTt '/ • • , .,... -..... Pressure Depth ... Meter Ul 1\3 -.... CJ UJO" I
0 ..... w .3 ~~ " c Rate' 1\3 >-:!' .... w . ... .<"'1 C W ..... Test ;:;, .... -'w Ul E of .... E c 0 E ....
..... ~'t:l ......... 0..-w " E .... ...-No. From To ~ ..... w Start Ene: w ........ 1\3 W Loss O"Ul, -:I' -... Net c; .....
1\3 0" + ..... I U c...c -c'" ... ~ ..... i:i E " ~ ~I -o· -.... "ft. w ... Ul
:: U 1 I u (psi) ..J w .... (gpm) ... -Eo< « "" --m. Eo< '.lnlts -. ,
I I. r../ J.J 1/.6 ::>.SO S'. t.f , ~.I'· : Ii)
~'f V.~O t Z.~L /0
~S3 /I 1." I l.Jrf (0
II·ZY 13.C;S" I Z.71 I~ 2 f ~,S" J/.7 SX/o·"
2-\ 2. 'f 1..."-ISo,," '#~~ j,,-. ," \ 0 . .3 10
.'.Iq '\5'0 I 0,11 {Q
(",10 fD s~ 1 0.4'( L~
c.. ~~ 7 0'. ( o 'It( 20 ..
7. 'I CJ 7, ,1: I b.2~ /0
) '-, 7., 'i 1 o· L" Ie.> ~,I -/~ I J.sxru~
.~ 2"'" 4'~ 'S.'--Lc~ . t. \ .., q·10 , S.c. IS' / .. '. ......
1")( I,lh L ... ~ '7.7 ~.7(J 'f. c u , ~. ! IS
-,roo \1 c.4 7 1 ,1.4{ ,'" 7.0 12. '-'U/D-'1
2..q 0 7.70 I '1.~ 30
7.7 () 12. I I ~.4 ~Q
12... \ II. S ( '1,g, -'fQ / '-f 1-~,::; ~~ , z7:Xlo-</
2..,!q ~. (., I 0.7 1.<
,J,IQ 'f.~ , 0,., 15'
~.o1 S./b I I 0'8 I~
.<:' I~ '.J , , O.,~ -I . .r n,i-16,):10-4
'1 1.f2~ .::?J, , 1, , 2.2~ 2.l.C ~ 0·0 Z.o
.2.1S z..?~ ~ 0 0 "Q " ~ -s7.~ 0.0
2.J 2."J 2-0·0 "0
I
I
I
Dept.h tC'l g:-ound· .. ate:-._ feet X O.433= __ psi Gage + Column -Frlctlon Loss=Net ?ress~r-=
* Column oressure = (de~th to mlddle of tested interval or depth to groundwater, whl=~ever 13
sma L.:: r) X (G. 433 )
;'::or.·.;erslon factors: ::u.ft.X 7.48=gallons
meters X 3.28=feet
2 kg/cm X 14.22=psl
llters X O.264=gallons
HARZA ENGINEERING COMPANY GEOLOGIC LOG Sheet No.1ii..
Form SG-2
September 1978 PROJECT •• c.~.~.-&..~.!.~~ ........ .!.~.f.7...:tf Date !.~ ....... .
Hole No ••• ;;;-..f.H::L............... Angle (from Horizontal) ••••••••• :t£~ ..... .
Fe.wr ••• f9.~l:l:!I ... :e............ Bearing •••• -•••••••••• O.l~'7',r ........... .
Coordinatlt: N •••••••••••••••••••••• om. Started •••.•••••• L+/.$t.$L ....... .
E •••••••• Tt •..• '\ .•.•••• o.t. Campletad .•••••• L.~/.!J.I.:(j ....••.•.
Core Sizes ••• 7.J±~ .... J.Jj~.) ....... Total Depth ••••••••• ,s..l. .• Q ••••••••••••••••
Graphic
1:_ Lot
.2 -S 'I ~ f ; .. a..ification end Physical Conditian • • a '!Q :I i .... -'e -..
:J IA c
2c
~
I-r , ,
~
'2
2.2 I-
~
l-.' iJD· tJ..t ...
~
2 ,( --~. IJ"~ c\../o".,
~41· cL.lo~.
0-2'/.S -/ ,~ t~·,L.I"
l-,.. to
~ 10" .....
.~ *" 7~: ~
" 15
0-
\
7$,. S,-,,..p, -~ ~.s" V. p.III" 27.0 -.30,0 C(Ol.(.." ~c.(. 4(.".." -~f Q1L 1.1, ~ ~ j J..;.. 7S· j ts ~. pol., ~ ... -.. -'/ ~ ~"'1. S sf.de, vI PU""'@ ,..·H . .,.\JoooO
'I ~ZS' ~~~. sc,:h. 0 { ,f~, 70 -7~ ~ S'C "'~.
~ ~o' ,., .... Q.,.'\.
f{.1f.." lifo sJ ~ rO('OS"-J. '-'-/ (j'rp ,s" I.e k· ~ ,." .. ,. v. .f ~ f~.bl'7 ...... +~d. S"l,~"-tf~ ro l \, "
~ ) ,,' ¥,r-P' 30.0· tf ~. ~. ,-~,
-::--, .. ' I, L.. --.,.
-.. / ~. a:,itr~
~1.I~t --/ fso· ! ........ ~ -, .
-..
~. , , (,l .~l. .'
~ \ ~/. t-~ ~" ....
~ y ~. c.11.., to\ ~ 0.-' (0'41-~..4~ ~ "..a c~.
~
~
~
~ ? "·cl.. ~r" •.
~
l:J
0 ~""l ....
~ ~ :'1;"1.
~
I-Jq.b -10'1' P'f ~
Ground Elevation ••••••• ~'!.'.? .......... .
Rode Elevation .•••••• .?~~ ........... .
Owerburden Thick".. ••••••• Q:.Z ••••••• _.
Ground-Water Eleyati~ rl~' JJf. r.f: U 1'. r
Logged by •••••••••• {.(~.t;J.~fut .•••.••••
.~ at i i at R..".rkl
c" a:: Q (Sample Data, Water Leyel.,
I C
c! a:: Drilling Q\arac:teriltics etc.) a:
cJ
--
~ I~ -~ ~ -~ -----.. -
--
~ ~ -CI "'" Cl V, -" -
---So.w-rl. 30.0 'Jt3 .•
-------
~ N -e I~ -~
-----
---
)
2
HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
September 1978 PROJECT ••• {;/~~.f:~r: .. lfi../.$ ..... {s..r..'? .. :..~ ...
Sheet No. ~:..3 ..
Olte ./.LL· ••••••
Hole ,., .••• ~/~I.L:.C ....... _ .... _ .... Angle (from Horizontal) ••••••••• ~~ •••••• Ground Ele.~on •••••• ~.t7. ........... .
Feature •• .r.~.~ __ "':.Y.i!:.>.~~!.. ••••••••••• Bearing •••••••••••••• ;~r~;;........ ....... Rock Ele.ation •••••• ~.~ ••••••••••••
Coordinltes: N .1~1..9.1,.Cf.l.1~1 ••••• o.te StlirtH ••••••• I.~ .. ~.fl. ............ Ow_burden Thicknesl ••••• ~~? ••..... ~ •..
E •• ~.I.(J.q~~~i.J: ... Date Completed ••• .!.l".i.~f+.'r.L ....... _ ... Ground-Wlter Ele.atlon .$LAr.i.~i!!=.C-.
Core Sizes ••••• _.Z'..d.c •..••. U~). Totlll Depth •••••• _ ••• D~9.. ......... _ ..•. _ L.o9ged by ••••••• ~Ad"':t:!~ ..... ---.... .
Grlphic i it Log ~
i ~ R .... 1u
f j i a..iflation IfId Phyaial Condition c:J a: Q (Semple DIta, War Le.ell,
.Ie! I I ~ CI
"'-'! a! a: Drilling OirllCt8riltica etc..)
:J i c cJ
-f, ~~. ~~ 0.0 -.$7. 0 Fo/I.fJ 6'~OA ~o~f'I+q ~ -r.s.t.: ... , ~ N? -~
.... 0 fiLs+.l_ . V...na~' • ,~-C;~ +~ ~""'Illf 'i"V Q --;:::. , .... .~s.~; .... I" ~ ...... +'!'-foN'.f~ tQ of.; -/. 'i ~ ~ ...,\.."\ {-", ~ -Il.c ~~t. ... \~ ~~ .. -I"'~"""""~ . -
~ I-(.-~'5I ... , .. ~(. i,,~(" 1'!;.~-lI.01 ~~ -~4 ~ ~ S ...... ~ ... --::..~~~ 0+ _
I-110· ~.~,", f.lu. '" !fe" ... ..J. , , ...... ,;.., .~ E' Ie.., ,.) ~ ..., rl)c..t +~ z..s ~< 'i f'a. .....
~ ~ ~. I . \lO ti 'IoCQ( .. .ro. +~ -.......
SI • ortL.. .. ~~.el{~. -.-i. ?<N-,Ic ",._~ ~ 3.~ ~ !low ~:..,--t:::" ~~ S" C4,,,'\·......c; ~\~+.'" ~ c.:.\ov d_ .... ,.s ~ $" --.... ~ ~~ -
'-~ I.· ... ~ ~'1 n+.--1,1. ~~. ; .... Jr.J. ~ 4.1... ..... ~ ~ ... --¥ -~ '--0. \-~ ~I~Q.+~ Q,L LA4Q.f of .. .. -b:::= 10' " .. S '.a, .. I .. ..., 0'0 ..... 1 • ~'"(':.,.< (.l.~.~) \ .. ~.-~:~ -.s.S -U' J. -
I 'oN. ~·t~ l~,..k-L • t-1.od+ ~~\... of;;. 2~' -c:: ~~-.. :--c' ~~L.. /1J. (' # ~..J, IJ (1.. ..... ." i + ~l.. (I. .. J. ... 4 ~ .. -;..:. ;~ -,.,.. .. .-to\. --S7.o • -; .... ,,, ... -..;: ok""'< 'l40~ c:4.("~~~:!o ---'u'
l).uQ..' IZ s ~I":"" le:.~ V.~.t... )-i .:ttt.. ~ I\~ Dw-t I\e ... ('Q. \J \P" + S !JQrt _
~ l"~ b ... t .. ~ ~ ~Q.~ ro,\: ~ ~+I~ -!' -V ~". ~"'l -{'I~~('f 1" .. c~r..rc.J d.C-,.,' jl.l.f¥,
h.o te:, ..
ro' .-~Sl. -...-Q~ Q"~ ?,ec. 4.~' ,.. I· .... 0.1 JAoa.J.{y t::)·L-O.1 -'." IH'tr CI"""'j ~I! ~ .l.co...-e dJCo'~ -..
'0 -I ~;: OT\. ,ro..,.e/ ~ ~~"f"ItVf. .N~d-f w-.4 f' .f~ -10.' ----~ -/ ~s' .Sl"'z. Z.t. Fr-&.SL.. ~.Io..w ~w:..~ ,( ") j~~ --I; ~c' ~~l
,." -S7. 0 ~GcI~ ~ SI'f [.I·r" 4ac...f. -. I Of.
~ ~ ~\, (,vlf~~d'~ !\1.lI.ssi~ 1 .. ~~".lf I.A4IC. -
.' --"'I ...... ~~te: .. f'.c. 4~ "''T ..... ~.l. "'0$.-;1"1 ~ ;$. --~ 1:5-~~~ 0.5-/.0 cf4".!'! ~r&c~ i,+...,\oCl(l -~ ~ -b;::' !,;," ~T' Q-f Z. 7.0 -~o.o ~. if":S· ~r. 0 t:J "--
¢.6d, jo! $~4C.c" ~,~L.. c L (~ ... "'--:;: roe .I -
( ~ SCI . cr+L ~ y""pfe. 1M ...... ~c. 5-1.,''''1 -
I c' Q~l IwfottJ ".J r:t6s-=r; 't~II,/, ~ ~ .0 ~'Iock
~ ( 70' ~~ ",.t, ~"_it.cl HurL. o-1(~ j+1. -
"'.Slck. of4~ falZcl..., o,...wI~/.·ct ..... (r(l-.l -.. JSS • , , ~£~' i", ~ ... k: ... \\0\ .... " .. !, . ~p'S4 ~J.~,J''''''~ Ib.\J.-.. ~ ~ :-lo' !r"Cl' ~ . ~(, ,,-.1 -Ie-S"' --"0" ---.-,
0 -~ * -
7 ~ .... -~ -
~ ----~ I~~ r~\<" .., ~ '" ~
"'. II
Harza E~glneerlng :ompany
~or:n SG-!S
::::-.ee':. /:;: /
~ / ~ --:-;::, :iaee I t:-/ ! I "3'/
REPORT OF WATER PRESSURE TESTING
PROJECT (fter/.!l~ k.t.e J~79-lJ
Hole No. ,Pd-/
Location ?t1A.~t JIovr~
Angle (from Vertical) ~Sf)
Bearing 07Sa
Ground Elevation 31. 7
Rock Elevacion l?7
Coordinates: N I.Z-0Z.!.' Z Z Date Started Il./q/?/ Water depth dunng testSI!4r+' .. lIc:!
,-:Q,.I/, ~::; E 3,/lO S~Z·~ Date , ; Completed /zIIIJTl Logged by
-..... Pressure Depth ..., Meter <Jl ~ -..... ~ <Jl(]l I
0 ..... ~ .3 I~ " c Rate' I1l >-~ ..... ~ . ... ·N C ili ...
Test J:>-.~ <Jl E of .... E c 0 e .... ...,~" ... ...,..., 0.-II) (j e . ..... ........
No. From To 0'..., II) Start Ene ~ ......... ! II) Loss (]I<Jl ........ -:l -..., Net c; ....
~ (]I ... ..... I U c...Q i:c "" ...,:i ..... :.J E -a -ft. ~ _ :n
:: U I I '" 0..
1
.;,t. u .... (psi) ..... (gpm)
r I w -~ E-.. c.. --m. E-unl.':s
1 2.~ )0./ z.~ 2, I) _'f.' 0 I ),'/J f'
'I. {.D 'oj I l,S t 0 '! S t:..SJ. fJL-'I
2 q.'1 2.0,0 lO.b. 5.7";-S.7( ,i. qa /u 0.0
3 I ~ t.( Jo c. (O,c., ~-,]I./ C. 7f.( 3 a,C,J IS' 0.0
l.t If''l 3" '0. c;. 7·0. 7. c) 3 0,0 20 .oc
I
S' '17 ~ ~I /0. r. 7.t{ 7."1 3 tole 30 0,0
J
~ 't({,,'f S. 70 (0 , '1 'If: /0 ~9 , 0.73 ~Cl 0 -z. 3~ ~Z~'o-$
JO,~'7 II . .3 Q I 071 t;u
1
I
I
I
I
I
I
I
I
J
Depch to g::-ound· ... ate::-___ feet X O.433= __ psi Gage ... Column -Frl.ction Loss=Nec Press'~:-
* :::l'j~:1 :Jressure -= (depth to ml.ddle of tested incerval £!. depth to groundwater,. ·"r1l.::--.e\:er :.s
sr:lal~er) X (J.43J)
"':or.verS.l.on facto!"s: cu.ft.X 7.48=gallons
meters X 3.28=feet
2 kg/cm X l4.22=psl.
ll.ters X O.264=gallons
HARZA ENGINEERING COMPANY GEOLOGIC lOG
Form 5G-2 j,
Sept.mber 1978 PROJECT •• _r;A!_~!!.r: ______ l!_t.4: .•.•.• !'5.f.1.:B
5hHt No.3!';
O,te It , ..... .. .... ~ ...... .
Hoi. No •• '"A.f.Ii::I. .......••..• ---.. Angl. (from Horizontal) ••••••• ~~.~ •••••••• Ground EI •• 8tion ••••••••• ~.!J ......... .
Feewr •••• 'h~~._t:{ ....... r.~_ ........ a.aring ........... .QZ~Z .. 7. ........... -Rock EI •• nion ...... ~."!.u .... u .... .
Coordinates: N •••••••••••••••••••••• Oat. Suned ••••••••••• ~1.,.]1.IT.L....... o..rburdtn Thickn •••••••• 9:~ ......... .
E r ......... n,. .•..... Oat. Completed ••••••• !.~~.!~ .r!......... Ground-Wner EI •• a1ion .sL..dr.t~JiAr.
Cor. Sizes ......... C? ..... I-Ii".~.Juu ToUi D.pth ........... r?',Z.9. ...... u.uu logged by uu.~A-.·.~.Y-uu ....... ..
Graphic J .1 i Log ....
I .... Remarks
; ~ f ! 1 a-iflcation Ind Physical CondItion a: Q (SlImp' D_. Wattr L ••• I ••
115 I. j a
... -'! a: a: Drilling OWte'tlrirtiCi etc.)
~ C cJ
. -~
~ 1'0· ~!; , -, -S'~
~ ~h
~'(~\oJ-".o~~ ~ -
~ /0-f~ ~. --~ -
~ ~ ~ -0 .. /' ~'!I C ~(O)tt: ~ ~ -", ... ".
I-I ---V (,0' IllL ? . . -5\.;,4~ • ---
,,-S~~ -
-..,. ~1. Clewly ~ .. ~ "ft. s-rf: 0 S~ -
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:
HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
September 1978 PROJECT ••• c.I!.f:.<.c!-::!':.J..c:.t~ ........ (.~.?9::.a
2
2.
3
Hole No •••••• t:~tl.;.3~ ..... __ .. _ .... Angle (from Horizontal) •••••••• 2.9.: ...... .
~ . -Z'7s'" Flnurl •• ~._. 11':'.5. ~........... a..nng .•••••••••••••••• __ ~., •••••••••••••••
Coordinltes: N ••• _ •••••••••••••••••• o.te Shined •••••••• !.?I-;.4.L.rI ..•.••••••.••
E •••••••••••••••••••••• D~e Complet6d •••• ..Lic/.~-I1J.. .•••• _ ••••••
Core Sizes ••••• z:.I!~ ... .c.t1.9..J. ••• Tow Depth ••••••••• ~'l.9 ................. .
Grlphic
c_ Log
.S! ii >-; -8 CIuIiflcation Ind PhyliQI Condition ~ Q. S' . ., a ~Q 1 i '! ""-.. a :J c
u
~ 11 1ft "ft'.C 10 "1
2.0.7 '0 1/'''''~:-4I... ,
~ V 3°· d..I".,.
~ '1 130 " ~~l
l..~ t-" ~i.~~. ~-tt....-t t ~~. 2?~· Z1:r,
~ ~ lPo E!!~. ~\y -A-. .. " _" ... ~~ ott~ 1It~ ;I."C~'t
~ Vi' ~. ~"'r\.. ~·h. \J..u.~ ~ ~ t..J.';'.~
~ ~o' h5+.:-a. (~ \-h .o..r ~~ ~ ~ .. (e.
410-
,
6t~~ ,.. ",,,,S\f'-... c~......,.. l/ sJ u-.~
~ {Ie..., 11 tHI .... +. r Y +Q c! 0 SA 1"1 -(:.,.. c. ...
X ~~= Fe S+o.~ ~ ......... -f{nlfJ~~OIJ+ ~Q#(. ",·.c~ 2 /f-
I-'! . I .. rr 0 cf«l tit,,, Pl~~~ O. I ~c.;c+ly. t).q-a.,
'-l-/o :r".l~&~' c~\'f -...~ ct.{...,.;~. Ie. ~ .
~ ~ ~t(.. +:) sf. l4._ft... ,~t'-...~~
;-S\ ..... +L. q f e (:z. C (0..'( '-<'40 ~ ... , (,,,,, ~ ..... A. Ie.
~ If"· '''~~II\1O. ~ a-J... ~M!Ct..~a.~ f.. •. ,.. c: \\. \~ .. \+#
~ ~ 13 0 • -~'" Ho.~ ~ S+"r:'''~ W\*L.. ....... ~c. g r-Q• ~-~, ~ clIL,.. Tr, i ~+fWlICL(' ~ 'orec"l~ fo'-.dt~
~ l,t' bJo ~.~I.. t ~J..+ tJ.V'~C;. ~"tl..a;r:~ &.'vor
~ ~ Jo· Icl.J~ 'J~" c.~~ ~ .-... -1-...:...c. '-...s \ ~.
~ I"'''lf,c...+ ·It ... ~ c...'1IN"'..",,"'-. \Iof'cUUII"
c -~l~\ • r.~~~ C;+z. ~~ i+~ -30.4-~ d .. ' .. of
O~CIJW' +\...oiC~L... .",-t-,
-~ ~~1..
Cllly -~ 30" ~~
L-~ ~o ""'" t'I.. rr"·(\·'1 -~'f. ~I~ .... 1... -rr,.C("y 3~.S"-'3".1 ~ ..... ~ .. , ~r -.-' ~~ ~I..I...,.. ~ c. loy',-,-~ a ~~ C ~" .. --. 'f
(,I~ V SO· ~.I' lry., ~-L.~1-c o~ ~"-~v.:+ .... o~-
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,~Q ~(...lC)of'
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f-Sol. ~"I...
f / ~~ ~I.-"" ~ 3
~
~ d,j,,.. ~ • c .0 ~\~. " ~
r. I/~: I g.,,,\ ~
Ground Eleyation ••••••• 2!~1 ........... .
Rock Eley~ion •••••••••• ~~ •. l. ............ .
C>verburden 1nn"=kn.ll .•••• !~:.~ ........ .
Ground-W~1f EleY,on •• ~".~cr.f?-:f..t,. .•.
Lotged by ••••• ~~ ••• ~t5:!~ .............. .
.S! ~ j. ~ AelMrlu ... ¥ Q (Semple D.u. Wlter Leyell. c:I a:
I c • a: Drilling ChirlC1llriltiCi etc.) a: ...
c3 cJ
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HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
Septlmber 1978 PROJECT •••••• CI!£~.f.~y. .. .J...9..R.-e ...... !.X.f:!.·8
Sheet No. ~1 ..
O.u .ff-/-:!!.t!.
Holl No ••••• !'.ti .. -.l ........... _.... Angll (from Horizontal) ••••••• l9.~ ........ . Ground EI.,ation ••••• ~ L 7 ............. .
FI8tUrl •• Z'!lfJ$.. .... S.t~;Z.~........ Baring .~.~ •••••••• ~;~/-f;. .............. . Roc:tc EI.,8tion •••••••• fkJ.7 ............. .
CoordinateS: N '~~~fr"7..~~ ... om Stamd ••••••• I.?./.$"".~I. ........... .
E .:;t./.~ .. ~.f/~~.:.l .... D8t1 Completed ••••• ~?:/.M.jzt ........••••.
o..,burdan Thick".. • •••• ! fo. ·.?r ........ .
Ground-Wat., EI."tion .~g~.'7..~.:'l~ ... .
Corl Sizn ••• ..J:. •• )! •••• 1R.t?J. •••••• ToUl Depth •••••••••• f.!.'! ............... . Logged by ••••••••• h.l.~~tf.~X .......... .
Graphic
Lot
I
QaaiftC8tion ..,d Ptlyaial Condition
0.0 -1'.0 '!. 74/".s! ,
$()4dlQ{fS ..-cf co ,/llel tJ f
(£~d'tH'I+~ !"lOe/of ~t'I.Mt/. IN: o~
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ftt 1IlJII. ~o ~ Irlt.". 0." M (-11 ~()j I
M~"< "' ... -+,-,,·'4 yr-~
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(Sampl. Datil, Wltar La,.I.,
Drilling Char.ct.rinica Itc..)
. .
~S~d -:fa I., 0
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Harza ~nglneerlng Ccrnpa~y
?orm SG-Is
.3:-.ee': I ~.; /
J a ': e ----;;; j Til
REPORT OF WATER PRESSURE TESTING
PROJECT Cks.-I-el' tl'J f/e /?7'J-e
Hole No. PH -3 Angle (from Vertical) 20 c Ground Elevation 3/.7
Rock Eleva~ion 1'.7 Location 10 /u~ .s 19ff
Coordinates: N I)101J 175.8
E 3 130 S03.7 I . , -
Bearing 2. 'SCJ
Date Started Il/lj-/17
Date Completed IL/~/?I r-.....
.....
Depth .., Meter \11 ", -.... Q) \110" 0 ..... Q) o ;<f-rn '0 c Rate' ~ ....
...:I' '" Q) . ...
Test ..c:"'-'Q) rn I: of ..,~'O ",.j.J.j.J 0.-
No. From To 0'.j.J Q) Start Ene: Q) ........ ", Loss ..... Q) i:c.j.J .j.J ...... ..Lft . Q).... rn ",:J I UJ e
...:I Q) 3 U I
.... (gpm) E-o m. E-o
\ I., ,4 30 I D,(" ,0'1 ~,I \
" Of. ~.s 14.) I G,.c)
r" . I 11.1 , fA v
2 2~.S 'to.! (O.b 7.5 7,S4' I 0.0'
7,st{ 7. 51! 2-0.0
"6, { !" 3 ~ , 0."
Water depth durlng test-=~.::-.:.~_
Logged by j), f ;-V'~ \ I
Pressure
I
", >-
.("\j c Q) .., .... e c 0 I: .....
Q) c.; e .... ,",-'
0"\11, -:J' -.., Net ~ ....
", 0" + -' I U c...Q -0 -
to? ~ -" I u . ... (psi) '"' « "---unlts
IS'
IS
I~ 1.( \ 2.. S' ) 2..~ IXlo-.3
10
lu
30
I
I
I
\
I
~.1' ~,~ I 0.09 3<.> 12.2--lfl..l. ~((. X 10-'1
'!4~
. I
't'l'S 2.-0,0 ,JO
€,<I~ T·4~ L 0, 0 '0
I
"l, ~q ] Cf9.~ /0(, 9.7~ 7. Z! I OD'" lu
~·n '1)~ 6·01.. 2... O.oi. 2.0
.,. "5/ 1.(~ I I 0.1 ..yo 1l.'L -.92.1-"1./ x/o-'"I
:;Ow" b. t. ~ 1'1 Lt:<:, . -'j,~/ 9,71 I 01 Flu
'I.b '£ " ,'! 0.01 l-a. OC'S'" 2 ...
Dept.h tC'l g:-ound· .. ·ate:-. __ feet X O.433= __ psi Gage + Column -Friction Loss=Ne: ?ress;,.;:
I
I
I
1
I
1
I
\
I
.. Ccl'..lmn pressure ,. (de~th to mlddle of tested lnterval or depth to groundwater, · .. hl=~.e\!e!:' CS
sma II e r) X (0.433)
Cor.·/Er:;lon factO~3: cu. ft. X 7. 48=gallons
~eters X J.28=feet
2 kg/cm X 14.22=psl
llters X O.264=gallons
HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form SG-2
September 1978 PROJECT •••• c..Iif.?fej{:._/..f._k~ __ ._.!.:;.?.Z.-r-
Sh .. t No . .3.l!_
Date .if./.!.!.,i 2!
Hole No •• ___ tt.L-_l _________________ Angle (from Horizontal) • ______ ?9_~ _________ Ground Elevation ----___ 31:.( ______ . ____ _
Feature _ :!i-t.i".$.. __ ~L~j? _ _'!_________ _ Se.nng .---------:::-?::.~F:.r.:..-r ;,-__ _________ Rock Elevation . _________ !.~~!. _____ . ______ _
Coordinatn: N ______________________ Date Started --______ 8_1_.4_'(1 _____________ Overburden Thicknes. ------~~:~---t:-----
E ----------Z-!.?-------Date Completed ____ .Lij_€-_IIL ___________ Ground-Water Elev?on f.!Z'_(,-~!,d: _____ _
Core Sizes ___ z:_ti2_____ d()J ____ Tot. Depth ----------~,/f_----------------Logged by _______ /!.. . ./1 .. f.r::_y. ________ ...
Graphic .2 c_ Log I at.
,9 oS ¥ at. Remarks >-• -! CI .. ification and PtlYliCilI Condition Q :; Q. S' .. 0 a: (Sample Data, Water Levell, :. . ~ 0 "!Q :I ! a I ! a: Drilling "'aracteriltiCI etc.) ~-·S ci c3 -..
~ ;;; 4( c.S
t-L/O.l --
~ / I.({ o,.l.ur
Is"~ -
t-(I .... I ~" , 'II.Z-It/,r CJ.~ ... ~f"-~~ -Z~ ;.-Itt d(oY' -j.,«.,-t:t clo.'1~Y /&4.+1. .5 t..-..~, -
t-/, (S 51, ""'" "ft.. -:1. 7r.· If:'. s-tQ ..... ~ ~O4 -r-/0° ~tL.. 1='«.
/ ji.-? ~ I~ -
'ft. r--~ 10" c.~ ~ -
to-1/ ~~ I'f"I. ' I~ ~ -~r!;'" ~ . .
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luslb{~ CQ~ I ... cs -~I Sree<...e.. fs.~ -ClS.e.
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APPENDIX B
FINANCIAL ANALYSES -COST OF ENERGY GENERATION
COMPUTATIONS
· .
APPENDIX B
TABLE OF CONTENTS
Load
Exhibit Expansion Capacity/ Growth Financing
Page No. Plan Res. El. Scenario Alternative
Cost of Generation from Entire MP&L System ---
I B-19-1 Base Case All/-Most Likely N/A
2 B-19-2 Preferred 2.5/885 Most Likely 12% Rev. Bonds
3 B-19-3 Preferred 2.5/885 Most Likely 5% Loan
4 B-19-4 Preferred 2.5/885 Most Likely 5% Rate of Ret.
5 B-19-5 Preferred 2.5/885 Most Likely 5%/13% Combined
6 B-19-6 Preferred 2.5/845 Most Likely 12% Rev. BOPlds
7 B-19-7 Preferred 2.5/845 Most Likely 5% Loan
8 B-19-8 Preferred 2.5/845 Most Likely 5% Rate of Ret.
9 B-19-9 Preferred 2.5/845 Most Likely 5%/13% Combined
10 B-19-10 Preferred L 5/84511 Most Likely 12% ?ev. Bonds
11 B-19-11 Preferred 1.5/845 Most Likely 5% i...oan
12 B-19-12 Preferred L 5/845 Most Likely 5% Rate of Ret.
13 B-19-13 Preferred L 5/845 Most Likely 5%/13% Combined
14 B-20-1 Base Case All/-Low N/A
15 B-20-2 Preferred 2.5/885 Low 12% Rev. Bonds
16 B-20-3 Preferred 2.5/885 Low 5% Loan
17 B-20-4 Preferred 2.5/885 Low 5% Rate of Ret.
18 B-20-5 Preferred 2.5/885 Low 5%/13% Combined
19 B-20-6 Preferred 2.5/845 Low 12% Rev. Bonds
20 B-20-7 Preferred 2.5/845 Low 5% Loan
21 B-20-8 Preferred 2.5/845 Low 5% Rate of Ret.
22 B-20-9 Preferred 2.5/845 Low 5%/13% Combined
23 B-20-10 Preferred L 5/84511 Low 12% Rev. Bonds
24 B-20-11 Preferred 1.5/845 Low 5% Loan
25 B-20-12 Preferred 1.5/845 Low 5% Rate of Ret.
26 B-20-13 Preferred 1.5/845 Low 5%/13% Combined
-i-
APPENDIX B
TABLE OF CONTENTS (Cont'd)
Exhibit Expansion
Page No. Plan
Capacity/
Res. El.
Load
Growth
Scenario
Financing
Alternative
~ of Generation from Chester Lake onl yll
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
B-21-1
B-21-lA
B-21-2
B-21-3
B-21-4
B-21-5
B-21-6
B-21-7
B-21-8
B-21-9
B-21-10
B-21-11
B-21-12
B-21-13
B-22-1
B-22-lA
B-22-2
B-22-3
B-22-4
B-22-5
B-22-6
B-22-7
B-22-8
B-22-9
B-22-10
B-22-11
B-22-12
B-22-13
Base Case
Base Case
Preferred
Preferred
Preferred
Preferred
Preferred
Preferred
Preferred
Preferred
Preferred
Preferred
Preferred
Preferred
Base Case
Base Case
Preferred
Preferred
Preferred
Preferred
Preferred
Preferred
Preferred
Preferred
Preferred
Preferred
Preferred
Preferred
All/-
2.5/-
2.5/885
2.5/885
2.5/885
2.5/885
2.5/845
2.5/845
2.5/845
1. 5/84511
1.5/845
1. 5/845
1.5/845
1.5/845
All/-
2.5/-
2.5/885
2.5/885
2.5/885
2.5/885
2.5/845
2.5/845
2.5/845
2.5/845
1. 5/84511
1.5/845
1.5/845
1.5/845
Most Likely
Most Likely
Most Likely
Most Likely
Most Likely
Most Likely
Most Likely
Most Likely
Most Likely
Most Likely
Most Likely
Most Likely
Most Likely
Most Likely
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
1/ Including 1.0 MW addition at purple Lake. I/ For Base Case, diesel units only.
-ii-
N/A
N/A
12 % Rev. Bonds
5% Loan
5% Rate of Ret.
5%/13% Combined
12% Rev. Bonds
5% Loan .
5% Rate of ~et.
5%/13% Combined
12 % Re v • Bo nd s
5% Loan
5% Rate of Ret.
5%/13% Combined
N/A
N/A
12 % Rev. Bonds
5% Loan
5% Rate of Ret.
5%/13% Combined
12% Rev. Bonds
5% Loan
5% Rate of Ret.
5%/13% Combined
12% Rev. Bonds
5% Loan
5% Rate of Ret.
5%/13% Combined
~IN4HeIAl ftMAlYSIS
lW1AIION IIAU:-0.010 PUll lStjll"ftO. IIA'£. 0.026
~£r£~~eE uA"=J4"uARY '~" _ .. _.,.. MO$1 lil([-lW $CfN_Rio
8,:41: C;IoU
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_~l rOsls IN , 1000
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Septlmber 1978 PROJECT •••• ~I.~.?t.'(t. .. ~f.t;. ...... (lf7..-.e ..
•• , •••• 0 ••• ~".ro.
Dati -"f/.2.iI(
Hoi. No"ni...a':~h .... C .•... '-... ' Angl. (from Horizon'-" ••••••• ZQ.~ ......... Ground EI'YI'tion •••••••• ~,?9.:L ....... .
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E ••••••••• _.,':;._) •••• o.u Completed •••• '/I.I __ ~. J.'XL ...... _... Ground-Wnw EleYetion ••••••••••••••••••
COri $lin ._ •• -IA:-f..n.UI.~ no. Totll Depth ... n ___ ... '-~~.O ........... uo Logged by __ .... nnn • .JJ..Jl£i..!.'1u .... .
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j tI-Remerkl .-i f J 1 CInIifIadon Iftd Phytica. Condition Q (Sampl. D_, Wlttr Ley.,s, Jcf 0 I j ~ Drillin, CbarlC1arifticll1C.) "'-'e cC c cJ
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HARZA ENGINEERING COMPANY GEOLOGIC LOG
Form 50-2
Septlmber 1978 PROJECT •••• r;A.~Af~r: ... h.~ .... lJ'l.'i::tJ
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O.u •• U';'!!rz
HoII PWJ".~.~{$.=.? •• F ...... -"' ... Angle (from Horizontall ••••• ""ZQ.~ ........ Ground EII.ltion ••••••• !.~ ... L ........ .
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FINANCIAL ANALYSIS
DIESEL -2.5 MW
MOST LIKELY SCENARIO
Diesel
Energy Fixed o & M Fuel
Year Generated Cost Cost Cost
MWH $ x 10 3 $ x 10 3 $ x 10 3
1982 a a a a
1983 a a a a
1984 a a a a
1985 6788 295 267 881
1986 7045 295 297 1003
1987 7314 295 329 1141
1988 7582 295 365 1296
1989 7856 295 405 1472
1990 8128 295 448 1669
1991 8472 295 500 1907
1992 8802 295 556 2172
1993 9147 295 617 2473
1994 9491 295 686 2812
1995 9600 295 742 3118
1996 9600 295 794 3417
1997 9600 295 850 3745
1998 9600 295 909 4109
1999 9600 295 973 4499
2000 9600 295 1042 4931
2001 9600 295 1114 5404
2002 9600 295 1193 5782
2003 9600 295 1276 6187
2004 9600 295 1366 6621
200S 9600 1141 1461 7084
-28-
Total
Cost
$ x 10 3
a
a
a
1443
1595
1765
1956
2172
2412
2702
3023
3385
3793
4155
4506
4890
5308
5767
6268
6813
7270
7758
8282
9686
EXH 1 BI T B-21
Page 1a of 13
Cost of
Ener9.l
Cents/kWh
a
a
0
21.3
22.6
24.1
25.8
27.6
29.7
31.9
34.3
37.0
40.0
43.3
46.9
50.9
55.3
60.1
65.3
71. 0
75.7
80.8
86.3
100.9
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EXHIBIT B· 22
Page 1a of 13
FINANCIAL ANALYSIS
DIESEL -2.5 MW
LOW SCENARIO
Diesel
Energy Fixed o & M Fuel Total Cost of
Year Generated Cost Cost Cost Cost Energ~
MWH $ x 10 3 $ x 10 3 $ x 10 3 $ x 10 3 Cents/kwh
1982 0 0 0 0 0 0
1983 0 0 0 0 0 0
1984 0 0 0 0 0 0
1985 4650 295 183 603 1081 23.2
1986 4720 295 199 672 1166 24.7
1987 4790 295 215 747 1257 26.2
1988 4870 295 234 832 1361 27.9
1989 4940 295 255 925 1475 29.9
1990 5010 295 276 1029 1600 31. 9
1991 5180 295 306 1166 1767 34.1
1992 5350 295 338 1320 1953 36.5
;993 5520 295 372 1492 2159 39.2
1994 5700 295 412 1689 2396 42.0
1995 5870 295 454 1906 2655 45.2
1996 6030 295 499 2146 2940 48.8
1997 6200 295 549 2419 3263 52.6
1998 6370 295 603 2726 3624 56.9
1999 6532 295 662 3061 4018 61.5
2000 6698 295 727 3440 4462 66·6
2001 6698 295 777 3770 4842 72.2
20C2 6698 295 832 4034 5161 77.0
2003 6698 295 890 4317 5502 82.1
2004 6698 295 953 4620 5867. 87.6
2005 6698 295 1019 4942 7103 106.0
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Metlakatla In~ian Community
Alaska 11 Annette ~
Finding of No Significant Impact
Chester Lake Hydroelectric Project
Approved by:
M~ SEP 1 S 19l1li
~ .~
Assistant Administrator -Electric
Rural Electrification Administration
U. S. Department of Agriculture
\ .
.,
Environmenta' Assessment
on the
Chester Lake Hydroelectric Project
2.S MW Facility
For
Financial Assistance to the
Metlakatla Indian Community
Alaska 11 Annette
By
Rura' Electrification Administration
Environmenta' and Energy
Requirements Division
Environmental Services Branch
Septenber, 1980
, \
TABLE OF r.ONTFNT'
1-SUMMAA~ _. __ . PAGE
A. Introductiq~ 1
B. Project Descript10n 1
C. Federa' and State Actions 2
D. Alternatives '-
E. Findings 3
II. PURPOSE AND NEED FOR ACTION 3
A. Existing Generation ( 3
B. Proj ected Need .. 3
III. ALTERNATIVES 4
A. No Action 4
B. Diesel Turbine 4
C. Wind Enerqy 4
D. Purcnase Power 5
E. Alternative Hydroelectric Sites 5 . .
IV. AFFECTED ENVIRONMENT 5
V. ENVIRONMENTAL CONSEOUENCES 5
A. Air Impacts 5
B. water Impacts 6
C. Land Impacts 6
1-Prime Aqricultural land 6
2. Floodplains 7
3. Wetlands 7
D. Flora and Fauna IMPacts 8
E. Noise and Aesthetics 8
F. Socioeconomic Impacts 8
6. Historical -Archeological I~acts 9
H. Unavoidable Adverse Effects 9
I. Relationships between Locil Short-Term
Use of Min's Environnent and the
9
Maintenance and Enhancement of Long-Term
P .. oductivity
J. I .... ev ... sible or Irretrievable Commitments 10
of Resources
VI. COORDINATION 10
VII. LIST OF PREPARERS 11
Appendix A -Letter~ of Comment
Appendix B -MIC's BER
I. SUM~RY
A. Introduct ion
This Environmental Assessment (EA) is being performed in ACcordance
with the Rural Electrification Administration (REA) Bulletin 20-21:320-21,
Part I, Section IV. 8. REA'Bulletin 20-21:320-21 and the Council on
Environmental Ouality Regulations implement the procedural provisions of
t~e National Environmental Policy Act (NEPA) of 1969. This EA is prepftred
• to Meet the reouirements of NEPA, other appl1cable'rules Ind regulations,
Executive Orders, and Secretary's MemorandUM on Land Use (No. 1827,
Revised) .
The ~tlakatla Indian Community (~IC) submitted to REA I Borrower's
Environmental Report (BER) prepared in accordance with REA draft guidelines
for such reports. The REA has reviewed and analyzed this report and has
used it for preparation of this EA. The REA hereby adopts Mle's BER as
contained in Appendix B.
8. Project Description
The proposed Chester Lake hyrdoelectric project will be located on the
west-central shore of Annette Isllnd in southeastern Alaskl. Annette
Island is one of the large groups of coastal 1sllnds in the Alexander
Archipelago. The prOpOsed project is loclted on Waterfall Creek and is in
the viCinity of the city of Metlakatla. The proposed project consists of
the following:
1. Rockfill Dam: A rockf1ll dam would be constructed a Short distance
downstre. from an existing dam. The new dam would be SO feet in height
and .ould rl1se the normal pool level of the reservoir from elevation 858
to elevation 893. Reservoir surface area .ould increase from 72 acres to
14, Icres. Useable storage of the reservoir ~uld be 4290 acre-feet.
1
, ,
2. Spillway: The spillway will be a side channel unqated structure
et:!.ated in bedrock ~~ .~~f1:~:~~ ::~!~~~y tc ,ass 1~00 cfs disharQe with
l.q feet freeboard.
3. Waterwals: A steel penstock 2800 feet in len~th and 24 inches in
di~ete~ .auld convey water from the reservoir to the powerho~se at
tidewater. A second steel pipe 24 inches in diameter will extend through
the dam with a remote controlled vllve on the downstream side {or emergency
water drlwdown and to provide water for occlsional aesthetic purgoses.
4. Powerhouse: A powerhouse containing one 2500 tw turbine-generator
would be located at tidewater below the dam. It .auld operate at a maxim~
head of 870 feet with a mean effective head of 850 feet. The project is
expected to produce an averlge of 10.729.~00 kwh of useable energy per
yea~.
5. Transmission: ADproximltely 0.2 miles of 12.47 kV line will be
constructed to connect the plant into the existing transmission system.
The transmission line would parallel existin9 access road and tie into the
existinq 7.2/12.5 kV loop-line from Purple Lake to Metlakatla.
e. Federal and State Actions
Federal and state actions that may be required for the proposed project
include: U. S. A""y Corps of Engineers Section 404 Ind Section 10
permits.
D. Alternatives
Alternatives lVailable to REA include: 1. Approval of the proposed
oroject and 'inanc111 assistance; 2. loproval 0' the project with
conditions and 'inlnc111 Issistlnce; Ind 3. no Iction.
The MIe hiS investiglted the 'ollow1ng Ilternatives: 1. no action;
2. const~uct1on 0' diesel turbines; 3. wind enerqy; •• purchase power; Ind
5. alternative hydroele,~ric sites.
2
. .
, J
E. F;ndincs •
water, and lan~ resources in the affected arel. This project will have no
significant effect on floodplains. wetlandS. prime 199ricultura' lands.
threatened or endangered species. or known hfstorica' and Ircheolo~ical
sites. Therefore. REA hiS reached a Finding of No Signiftcant I.pact.
II. PURPOSE AND NEED FOR ACTION
A. Existinq Seneration
I,
The HIC currently owns and operates the Quarry diesel·electric plant
and the PurDle Lake Hydroelectric Pllnt. The Quarry plant is located
app~oximately three miles south of ~takatla and consists of two 2160 hp
Fairbanks-Morse engines with 1ft installed clpacity of 3000 KW. The PurDle
Lake plant is located approximately four miles southeast of Metaicatla and
consists of three 1765 hp horizontal, Francis tyee turbines with an
instailed capacity of 3000 kw. MIC's distribution system co"tains
approximately 32 miles of line serving 410 residenti •. " and 40 small and 15
large commercial customers.
8. Project Need
To provide reliable power to future residential. commercia'. Ind
industrial consumers. MIC has an estimate requirement for capacity and
energy of 9150 tw by 1981. and In energy capability of 33.3 _ill ion kwh
(REA. April. 1977 Power Requirements Study). Existing firm capacity is
roughly 4500 tw. The proposed project will usist !lUC in Meting these
projected needs. The action of REA in the form of financial usistance to
MIC will enable MIC to construct the proposed project Ind Meet the
projected need. This action is necessary to insure the efficient and
reltable provision of electric power to MIC's consumers.
3
, I
III. AlTERN~TIVES
A • No At t 1 0 ro
If no actfon was taken on MIC's request for financial assistance, the
prooosed Chester Lake ~ydroelectric project would not be constructed. This
would result in the failure of ~IC to meet the oresent power needs of its
consumers and to deny sevice to new lPDlicants. The impact of this
alternative would result in economic disruption to the Metakatla Indian
Comrunity. It may also result in the need to construct more expensive ,
diesel turbines and/or purchase more expensive power from the Ketchikan
Public Utf1ities System.
B. Diesel Turbine
The use of diesel turbines to meet the power needs of MIC would cost
~ore than the delivered cost of power from the proposed oroject. This is
because of the increased cost of replacement diesel fuel, which continues
to escalate. Additionally, the Fuel Use Act of 1978 also places certain
restrictions on the use of petroleum in new power plants and generally
discouraQes its use in new power plants. The environmental imoact of this
alternative .auld result in mere effects than with the proDOsed project.
Possible oil spills, and increase air and noise pollution would result.
C. Wind Energy
This alternative is econom1cal with an average annual wind velocity of
30 mph, a nearly steady wind magnitude and direction, and within a
topographical area in which boundary-layer effects are ~inimal. Favorable
overall wind speed, Siting areas, and an electrical ~rid capable of using
interruptible power are not available to MIC for this alternative.
Environmental impacts with this alternative would not be significant except
for possible noise impacts associated with windmill desiqn of rotary
blades, terra\n effects, and weather conditions.
4
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D. Purchase Power
~~: ~'~e~ft~.;ue ;"y~~t;gated a DOss1ble transmis~1n" linp tip.in to
the Ketchikan Public Utilities System. Ketchikan ~enerates over 16 Dercent
of their pOwer with diesel turbines and would result in service to MIC with
this costly power.-This alternative NDu1d result in construction of
transmission line with probable insignificant environmental i~acts, but
increased cost of power over and above those costs associates with the
proposed project.
E. Alternative Hydroelectric Site
< ,
One alternative site was investi~ated for the proposed hydrelectric
project. Trianq1e Lake located approximately six miles northeast of
Metakatla would be a feasible site. The lake has enough surface area,
elevation and flow (70 cfs) to support an estimation 2100 kw of prime
power. Environmental i~pacts associated with this site include increased
transmission line routing (9 miles vs. 0.2 miles), and geologic and
hydroelectric enqineerinq complexities. These factors would contribute to
increased construction time, and costs of power.
IV. AFFECTED ENVI~O""ENT
See section 2, pages 7 throu~h 73 of Mle's 8ER contained in Appendix B.
V. ENVIRONMENTAL CONSEOUENCES
A. Air Impacts
During the construction phase of the prOject, air impacts would result
from fugitive dust tmissions during construction activity and vehicular
movements. SIoke will also result from the burning of debris and
vegetation removed during cleaning activities. These impacts will be of
short duration and relatively inSignificant. Operation of the facility
will result in no impact on air resources.
5
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B. Water Impacts
Ourina construction of the prODOsed project, increased turbidity and
s;ltation will occur in Waterfall Creek due to dam, spillway, and waterway
constructionlcfivfties. Some erosion and sedimentation will also occur
during clearing, scrapin~, and compaction activities. All exposed Ireas
will be property revegetated with native plant species IS soon IS
practicable to reduce erosion and water quality i~lcts. Since
'.
construction activity will not effect the existing d .. , potable water
intake structure or the stored water no chanqe in botable .. ter quality
will occur. The above construction related impacts Ire considered to be
minimal and of short duration.
Operational impacts on water resources and aquatic habitat will be
Minima' since the project will be built on an existing d. location thus
havin~ a minor fncrease in exist1nq fmpacts to the area. These fmpacts
fnclude dfssolved oxyqen depletion, loss of habitat, surface level
fluctuatfons, and downstream scouring. However, these impacts have been
determined to haye a .'n'.al t.pact since no fish specfes or ffsh nurseries
are present in the existing lake and downstre. area.
c. Land I.pacts
1. Prfme Agrfcultural Land
The proposed project .auld rafse the no".al pool ellYation from rouqhly
858 feet to 893 and subsequently inundate IPprox1.ately 72 teres of land.
The surface .11 of thl lake .auld roughly double. The land 1s currently
covered with sparse Alpine vegetation Ind IPprox1.ate1y five acres of
forlstld lands lDuld be iMPacted. Correspondence with the Soil
Conservation Service (SCS) (Appendix A) 1ndicates that -i.pacts an
potentill rlnge and forest land also appears minima1.-The SCS has Ilso
. .
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concluded that the ·potential for aqr1culture (farm land) 15 very minimal.·
T"e D~,l. ~!S therefore determined that t"'4s !''''''~-+ w411 have"" affect on
prime farmland, ranqeland, or forestland.
2. !1Eodpl"lms - .
The Army Corps~f Engineers (The CorDs)has indicated that they do not
have enouqh infor.at1on to delineate the extent of floodplains in the
project area (Appendix A). The Corps also state t~at since the anew
structure will provide .are control of the flow, the t~reat of downstream
<
flooding will be reduced.-Since every strelm hiS a floodpllin, _EA has
concluded that there fs no practfcal Ilternatfve thlt .ould avoid the
floodp1ain of Waterfall Creek. The proposed project will however, provide
protection downstream by reducing flood potentfll. It is REA's conclusion
that impacts on floodplain values will be .inimal.
3. Wetl ands
The U. S. Fish and Wildlife Servfce (USFWS) office in AnchoraQe,
Alaska, has f;eld visited the project area and found minor .. tland areas in
the Chester Lake wltershed. The USFWS has concluded however, that these
wetland Ireas Ire inSignificant (Appendix A). The REA hiS therefore
concluded that ~ile this proposed project .. y i~lCt .. tland Ireas,
partfcularly the shillow body of .ater I Quarter Icre fn sfze near the ma1n
tributary of the lake, there fs no practicil Ilternative to the avoidance
of this f~act. These .. tland IrelS will be tnundlted u the nomal pool
elevation is rlfsed. Consequently. their Yllues IS I nltural resource will
not be entirely lost. The REA jud~es the fllPlCt on .. tllnd IrelS to be
.tnf"ll.
7
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O. Flora and Fauna Impacts
The increase size of the like ~~~~ ~::4l~ ~r. the ~oss of approximately
70 acres of vegetation and wildlife habitat. Vegetative cover in tne Ireas
w~ere construction Ictivity will take pllce will also be lost. The project
-.ay result in hlbitat suitlble for the survi~ll of fish thlt mlY be
trlnsplant into the lite. Currently, there are no fish in the like.
AQultic invertibrltes could increase in density after the llke .. fills, WIne
1nvertfbrates existin~ downstream mlY be lost due to the nature of stream , ,
flow IS regullted by the operltion of the completed project.
Correspondence from the IJSFWS indicltes concurrence with REA's request
for I dete~ination thlt the proposed project is not likely to affect
listed or proposed to be listed, threltened or endanQered species (Appendix
A). The REA therefore finds that the proposed Chester Lake Hydroelectric
project will not affect listed or proposed to be Hsted, threltened or
endlngered species.
E. Noise Ind Aesthetics
No si~nificant noise i~lCts will occur as a result Of project
activities.
The continuous presence of the waterfall at Chester Lake wtl1 be lost.
The proposed project does incorporate provistons for releasing water to
create an instant waterf.ll for tribal eeremonies. or for other aesthetic
purposes.
F. Socfoecon~ic IMpaets
No adverse iMPact to housing. services. or infrastructure in the city
of Metlakatla ~ll result. Local lerchants will experience inereased
business end amplO}ment durinq and after construction.
8
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G. Historical -Archeological Impacts
Correspondence from the .A.~~:~I State ~isto!"-cc !»reservation Officer
indicates that provided the old powerhouse is not destroyed or
substantially ~odified by the proposed construction, they -do not feel t~e
proposed construction will wapact any properties listed on, or eligible for
listing on the National Reqister of Historic Places· (Appendix A). An
Arc~eological survey was also performed in April 1979 by the University of
Alaska. ~e survey did not ~ve.l any cultural features that .arrant any
<
special consideration for protection during the construction of the
prOject. For any cultural resource that .. y be discovered during
construction of t~e project, ~IC will stop construction and notify REA of
the finding. Appropriate action will be taken pursuant to Section 106 of
the National Historic Preservation Act and Advisory Council on Historic
Preservltion Regulations.
~. Unavoidable Adverse Effects
Adverse effects which cannot be avoided include fu~it1ve dust ~1ssions
Ind some noise during construction Ictivity. Erosion and sedimentation
.will 1150 OCCur during construction. Seventy acres of lind containing
sparse Alpine vegetation and five acres of ~odllnd will be inundlted.
Floodpll1ns Ind possibly wetland Irels will be encrolched upon.
t. Relltionships letwten Local $hort.Ten. Use of Man's Environment
and the Maintenance Ind Enhancement of Lons-ferm Productivity
Short-teMm yses of the Iftvironaent include i~acts froM co"struction of
the project. i •••• fugitive dust .. issions. noise, erosion. and
s!dillentltion, Ind turbidity and sntltion. These illPlCts are not
significant and short in durltion. These short·ter. uses of the
environlent will result in long.term productivity gl1ns and cost savings
for MIC's custaftlrs.
9
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J. Irreversible or Irretrievable Commitments of Resources
During consti· .. .:!~Cl":. !a:c:-. :~!r',1Y. and material inputs ~" ha
c~itte~ irreversably. Seventy acres of land will be inundated as a
result of dllii·c6nstruction. This land is sparse Alpine veqetation and
contlins five acres-of NOoded land.
VI. COORDINATION
The MIC hiS contacted the following agencies:
~llska Department of Natural Resources
U. S. Fish Ind Wildlife Service
4.
U. S. Army Corps of Engineers
Soil Conservation Service
C~ents received from these agencies are contained in Appendix A.
10
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VII. LIST OF PREPARERS
A. REA: -
Jo~eph Binder -B. S. Chemical Enqineering; Director, Environmental and
-Energy Requirements Division.
Directs and isiresponsible for administering the EERD. Designates
staff functions related~o the environment and energy reauirelent
activities required by the REA and its borrowers.
Charles Crowley -Diploma, Marine Engineering; Chief, Environmental
<
Services Branch.
Provides staff assistance in administering environmental enqineering
activities of the rural electric DrogrlM relatin9 to the planning,
desi9n, construction, operation, and .. intenance of pOwer plants,
transmission and distribution lines and substations.
John J. Voycik -B. A. Geography, NRP, Regional Planning, Environmenta'
Protection Specialist
Studfes and Iftalyzes the fmpacts of REA financed power ~eneratfon and
transmission fac111ties on the IUJ'IIftade and natural environment.
Prepared environmental assessment Iftd served IS project -.nager for
env1ronmenta' concerns.
B. Metlakatla Indfan Community
Robert W. Recherford Associates -Consulting Engineers to MIC.
Prepared the IER.
11
APPENDIX A
Coment Letters
.
SOIl
Conserv.l.on
~rvir.
-. _ ..
Ms. H.ncy Stephens
Contract Administrator
Netlakatla Power and Lilht
P.O. Box 346
Metlakatla, Alaska 99926
Dear ~b. Stephens:
Profession.1 Center -Suite 129
2221 E.st Northern Lights !ou1ev.rd
Anchor.ge, AK 995"" (~I'I"~ ""'._I . .,l.~
June 18, 1980
The available resourc~ data is soneWhat li.ited for the ar.a of your ~ro
posed Chester Lake Project. However. t have exa.ined what the Soil Con-
servation Service has, and have discussed the proposal with both the
Forest Service and Bureau of Indian Affairs personnel. As a result. I
have co.e to the conclusion that the potential for a,riculture (fara land)
is very .inimal. I~act on potential ranle and forest land also appears
.int.al.
ke have returned the plan a.p for the works of illprovnent under separate
cover. Please feel free to calIon our alency in the future.
:;;-;;i /iuA
1Iurton L. ell !!ord ~
Stat6 Resource Conservationist
•
--United States Department of the Interior
Mr. Charle. Philpott
FISH·."ND WILDLIFE SERV1CE
10J I E. Tl,;DOR RD.
ANCHORAGE. ALASKA 99503
(90,,276-3800
Kana,er. Western Area-Ileetric
Distributiou Systems Divi.ion
lural Electrificatiou Admini.tration
Wa.hiDltoD. D.C.
Dear Mr. Philpott:
17 JUN i980
This responds to your raque.t for tDfor.atioo re&ardtDa the occurrence
of proposed or listed threatened or eDdanlerad specie. which .., be
. affected by the propo.ed Che.ter Lake Hydroelectric Project on ADDette
1alaod io .outheastero Ala.ka.
Ia.ed 00 the bast iIltorutioo curr_tly ."ailabl. co ua. 110 propo.ed or
li.ted threatened or aDdanaered sp.cie •• for which the Fish aDd Wildlife
S.rvice bas re.ponsibility. are pre.ent ill the proj.ct area. I CAn.
therefore. coocur with your decarainatioo of "will DOt affect".
lev 1Dforution iodicatiDa the pre.eDce of CDrreatly 11ated threat_ad
or _daDlered .p.cie. admini.tered by the Fi.h aDd Wildlife Servic. or
the l1atinl of Dev .p.ci •• wbich .., b. aff.cted b7 the propo.ed project
will require recooaideratioD of JOUr d.c~oat1oD.
Ve appreciate your coocena for _aDlared wildlife. '1 .... COlLtact us
if you hav. qu •• tiona or if va caD " of luth.r ... i.taoce.
•
/*11Kftal'1. /) lC:: /n. / I-t--
iLaGfCiif Ar .. Director
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.I., S. H ..... OND, GOVERNOR
Chip Dennerlein, D1rect~r
DEPARDIL'T OF 5ATtJRAL RESOURCES "g Wlrehou" Or .• SUite 210 Anchorage, Ala .. 8i501 274-4675
.
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June 16, 1980
1130-13
Raney Stephens
Contract Admini.trator
Metlakatla Uaht and Pover
P. O. lox 346
Metlakatla, Atuka 99926
DIVISION ", ~A"ICS
, ,
This letter i. in re.pon.e to your reque.t for our comaent. re.arding
impact of the Che.ter Lake Hydroelactric ,roject on cultural ra.ources.
We .re avare of th. exi.tance of a h,droelectric powerhou.e built in
1928 and used until 1956 which t. located at the ba.e of the vaterfall
on Waterfall Creek. We further under.tood you to tall u. over the
telephone the old powerhou.e would not ba de.tro,ed or .ub.tantially
.edified by the ,ropo.ed con.truction. Provided tho.e condition. are
.. t we do not fael tha ,ro,o.ed con.truction viII iapact any ,roperties
li.ted on or eliaibla for li.tin; on tha Ra~ional .. ,i.ter of Hi.toric
Place.. We feal thus due to the .iailar a~tivitia., hydroelectric
production, of tha older and new .tructure.. In the event tha ,ropo.ed
construction viII phy.ically altar the 1928 .tructure, fadaral regulat1on~
36 CTI 100, raquire a deter.iDation of aliaibility for inclusion on the
National lali.ter of Hi.toric Place. and .ubsequent con.ultation with
this office. At that ti. a deteniDatiOD of effect OD the structure by
the ,ropo.ed action would be.. to be .. de aDd ~tilation ,rocedure.
dev.loped to Id.n1a1ze Sapact.. U ,OU haft aDY further que.tion.
re.ardin. this '1 .... contact us.
Sincerely,
..... _/~(J~ ... ,j)~ ,/lib
-----11111,,1 S. "able
State B1.toric Pre.ervation Officer
Enclo.ure
./ev
United States Depanment of the Interior
. FISH AND WILDLIFE SERVjCE
.0. I E. TUDOR RD . -. -~ .
Metlakatla Power. Light
P. O. Box 346
Metlakatla, Alaska 99926
Dear Sfrs:
ANCHORAGE. ~LASKA 9950)
(907) 27b-3800
I • JUN 1980
, ,
This letter is a ~sponse to your request dated May 22, 1980, for a
U. S. Fish and Wildlife Service determination on the presence of wetlands
in the Chester Lake area of Annette Island. On June 18. 1980, one of
our biologists visited the art. and found the min~ wetlands involved
in the Chester Lake watershed to be inSignificant. -
We found the entire watershed to be domin.ted by bedrock. The outlet
stream cascades down a bedrock face .nd enters the salt waters of
Port Chester at an angle of about 800. No intertid.l fish habitat is
p~s.nt. Adjacent to the Min tributary of the lake is a shallow body
of Wlter about 1/4 acre in size. The associated prilMry production in
this area is minilMl and we Judge this wet area to be insignificant •
•
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DEPARTMENT OF THE ARMY
ALAaKA oe.-rRICT. CORN OP'IIHOINIlER.
".0 .• _700 •
• NC..o_.U .• U .... "'0
30 JUN 1980 ".L.' ~o anf." •• O': .. -.....
NPAD1-PL-FP
Ita. Jancy St.ph.ns
Metlakatla Pov.r and 1.1lht P.o. Iol( 346
Metlakatla, Aluka 99926
Dear Ma. St.ph.a:
In r.apona. to your l.tt.r of 22 Nay 1980, va aub1l1t the follow1nl
~nta:
a. Ev.ry au'.u baa a flood plain, 1acNe".r, •• do DOt uv. anoulh
information to d.lin.at. th •• ~t of thoa. 1D 10ur proj.ct ar.a. Since
the new atructur. will provide .ar. cODtrol of the flow, the thr.at of
cIDwD. tr.alll f1oocU.n1 vi11 b. ~aduced.
b. A Dal)art_nt of the AI'IIY ,.twit vUl 1». r.qu1r.d b.for. th1a
project car. i). ccmatruct.d. 'lb. dr.dplla for the tailrac. aDd the
conatruction of the portion of the outfall lin. that would be below the
.an biah vater1ine (13.7 MLLW), of Port Ch.at.r, ~equ1r. Corpa of Enain.en
authorization purauant to Section 10 of the l1".r and Harbor Act of 1899.
Th. dam in Waterfall C~eek and the portioaa of the poverboU8e fill and the
acc.a. road f1l1 that would 1». 1».1_ the hip Ude Una (18.7 MLLW), of
Po~t Cheat.r, require Corpa of .a1Da.~a a.thoriutiOll purauallt to Section 404
of the Clean Wat.r Act of 1977. 1 Iaa'ft iacloa.d a puplllat aplaillina the
Depart1leftt of the J.nrJ 'ertl1t 'roar-aaill1at.r.d by the Corpa of Inain.er.
ed a blank para1t application. AdcHtioul patwit iDforaation .y be obtain.d
by cOIlt.acUq our laaw.atory 'UDCtiOU Iraacb at 279-4123.
If you Uv. any further queationa, '1 .... do DOt h.aitat. to contact
1Ir. Muon D. Vacla, of ., nood Plain llaua_nt lection, at 752-3246 •
2 IDcl
oM atat.d
• iDeer.1y,
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ANNETTE ISLAND ALASKA
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CClllfTCQt '-T'ERYALS • 100 'T.
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ALASKA POWER AUTHORITY
CHESTER LAKE HYDROELECTRIC PROJECT
Summary of Public Meeting
February 18, 1982
Metlakatla, Alaska
On Thursday evening, February 18, 1982 at 7:00 p.m. a public
meeting was held in the Metlakatla Indian Community council chambers to
hear reports and discussion on the Chester Lake Hydroelectric Project.
Twenty-three people attended (list attached). The Metlakatla Indian
Community Council and Met'akatla Power and Light Board conducted the
meeting. Other agencies represented included the Alaska Power
Authority, Rural Electrification Administration, Bureau of Indian
Affairs, and Harza Engineering Company. Harza conducted the updated
study of the Chester Lake Project for the Alaska Power Authority and
community of Metlakatla.
Brent Petrie of the Alaska Power Authority gave a brief history of
the Chester Lake Project from: ..
1. Its use as a power and water supply.
2. The recommended development of Chester Lake by R.W. Retherford and
Associates in a 1977 definite project report.
3. Exemption from licensing by FERC, and
4. An appropriation by the 1981 Alaska Legislature for engineerin9
feasibility studies.
He explained that the report to be discussed tonight was the result
of the 1981 appropriation and was required to determine the economics of
the project before any state funds could be allocated for construction.
Richard Meagher of Harza Engineering Company presented a summary of
the geotechnical work that was underway at Chester Lake in November and
December 1981 and went on to present information on the following:
1. Electric Load Forecasts -Although the overall electric energy
demand is expected to grow, some reduction in residential electric
energy consumption ;s expected in response to conservation measures
in the area of electric space heating. Three different forecasts
were prepared in response to various economic factors (timber
processing, fish processing, harbor development, etc.).
2. Capacity Needs -When the existing Purple Lake hydro plant reaches
capacity or is low on water, the remaining capacity need is met by
diesel generators. This may be for a short period to meet peak
demands when the mill is operating or may be for longer periods
when Purple Lake water supply is depleted.
3. Economic Evaluation -Several plans were presented based upon their
cost in present day dollars over a 50 year planning period.
The "base case" situation of existing Purple Lake hydro and new
diesel woul~ cost $55.7 million in Januarv 1982 dollars. The Chester
Lake plan plus existing hydro and diesel as needed would cost $35.5
million. A Triangle Lake plan with existing hydro and diesel as needed
would cost $43.8 million. These are economic costs over a 50 year
period and not construction costs.
Mr. Meagher then explained the detailed aspects of the Chester Lake
Project, including geology, environmental, access and cost
considerations. There was considerable discussion about access and
costs of the project. Mr. Solomon Guthrie asked whether or not a road
was necessary for construction. Mr. Meagher said the plan included a
road but that the project could be served by a barge. A footpath could
replace a road for maintenance. Mr. David Horton of BIA mentioned
possibilities of road development with future timber sales and that was
something that would need discussion.
Mr. Meagher explained that the present concept for powerhouse
location was different from the 1977 report because poor foundation
conditions and steep talus slopes required moving the powerhouse
location to more stable area near the mouth of Chester Creek. Mr. Jack
Booth asked what the cost difference was of this location over the
other. Mr. Meagher said the main difference in construction cost was
the cost of the access. Total cost estimate for the entire project is
$13.9 million in January 1982 dollars of which the access road is about
$1.5 million. Mr. Booth was concerned that the present cost estimate
was so high and indicated that Harza staff once said the project could
be constructed for $5.48 million. Mr. Meagher said that if Harza staff
actually said that they were out of place since no studies had yet been
done. He said they may have said some sort of project could be built
for $5.48 million, but it certainly would not be the 2.5 MW storage
project they had investigated.
Al Yost of REA asked if there was a 1985 on-line construction cost
estimate. Mr. Meagher said this would be discussed in the cost of
energy analysis. The cost estimate to bring the project on-line in 1985
was about $16.8 million.
Solomon Atkinson asked how much higher the storage dam would be
than the present water supply dam and would there be any debris
problems. Mr. Meagher replied the storage dam would be forty feet
higher than the existing dam and there were provisions for clearing the
brush around the reservoir before filling.
There was aeneral discussion of the differences in the R.W.
Retherford report and the Harza report. It was pointed out that the
elements of the Harza estimate were very comparable to other' costs that
were being bid on nearby projects near Ketchikan and Wrangell. Mr. Bobo
Dean pointed out that the differences between the Harza estimate and
Retherford estimate were more than just the access road and inflation
since 1977. Mr. Petrie said that earlier estimates may have been too
low. The Harza study also has the benefit of more field data on the
site conditions.
2
Solomon Atkinson asked about the possibility of locating the
powerhouse where originally planned in the Retherford study.
Mr. Meagher and Mr. Petrie pOinted out that the loose rock in the area
was very steep and that cutting into the toe of the slope could make it
unstable. Mr. Meagher said in the view of his company it would not be
prudent to locate the powerhouse below the talus slope where it would be
damaged in an earthquake. It was his opinion that to excavate and
stabilize the area may cost more than the present project configuration.
Mayor Nelson pOinted out that the existing dam is in need of repair
and the community may have to spend a large sum on the dam just to
maintain its water supply.
Dave Horton of the Bureau of Indian Affairs thought the access road
costs might be too high and suggested contact with the BIA Highway
engineering group in Juneau. This was agreed to be do"e.
Mr. Dean asked Mr. Yost of REA if there were any changes proposed
by REA that would affect the REA loan program. Mr. Yost replied, yes,
that interest rates for generation facilities were proposed to be raised
to 12 -14%.
Solomon Guthrie asked about the possibility of Purple Lake
reservoir expansion. Mr. Meagher responded that it was examined and
that only a very small amount of additional energy would bp. available
but at significant cost. Harza did not feel additional reservoir
capacity was justifiable but that additional capacity in the powerhouse
could be more favorable possibility.
. .
Jack Booth asked if costs could be reduced by reducing the
installed capacity at Chester Lake and building a smaller dam. Pros and
cons of this were discussed at length. A storage dam would regulate the
water for use during high electricity damand and or low water flow
periods. A run-of-the river project would provide less dependable
energy, when the water was available the plant would provide energy and
when it was not available then the capacity needs would have to come
from diesel. Purple Lake might provide regulation for a Chester Lake
run-of-the river project.
Mayor Nelson asked where costs could be cut. Mr. Meagher suggested
first looking at the access road, if its inconvenience during operation
was acceptable; Secondly, a lower dam and run-of-the river project
could be considered; after that, shavin~ back on the installed capacity
would be possible. However, reducing capacity would eliminate the
ability to generate if surplus water was available and could be a bad
tradeoff since the other option was diesel. The equipment costs of the
hydro plant are not as significant as the civil works items. Reducing
the dam height and access road would probably be the most significant
cost savings but reducing the dam height would affect opprat;on. The
costs might be reduced by about S3 million by eliminating an access road
and building a lower dam with access by helicopter rather than by
cab1eway. Mr. Meagher emphasized that despite these cost cutting
measures that the costs would still be greater than the 55.48 million
3
which had been requested from REA. Mayor Nelson said that fina~cing was
the main concern of the community.
Mr. Yost of REA said it would be difficult to locate aggregate for
concrete on Annette Island and wondered if a rockfill dam could be
constructed at less cost. Mr. Meagher pointed out that the volume of
material in a rockfill dam would be more than in a concrete structure
and significant amounts of concrete would still be needed for the
spillway and outlet works. In a concrete structure the spillway would
be incorporated into the dam and the volume of material would be less.
There may not be a major difference either way, but there are fewer
uncertainties with the concrete structure. Mayor Nelson pointed out
that the aggregate would probably be shipped in from British Columbia as
it is in Ketchikan. Mr. Meagher was aware of this and considered it in
the cost estimate.
Mr. Jack Booth asked what happened to the idea of a rockfill dam
with a metal face. Mr. Meagher replied that Harza believed it would be
impractical from a maintenance standpoint, since the amount of drawdown
in the reservoir would be controlled by the need to maintain storage for
the community water supply. It would not be easily possible to draw
down the reservoir to make the periodic inspections required of the
metal facing. Mr. Booth asked if it would be more economical to install
a 1000 KW plant rather than a 2500 KW plant. Mr. Meagher said he
thought not since the site was cabable of 2500 KW and to add 1500 KW at
a later date in the near future would tend to increase overall costs.
Equipment would have to be ordered twice and contractors would have to
mobilize twice.
Mayor Nelson wondered if we should go back to the drawing board and
see what could be done for $8-9 million. John Leask said he did not
think so and felt that money should be found to build what was needed.
Mr. Petrie explained how APA used the economic analysis to recommend the
most economic project. He suggested that based on the Council's,
Boards, and Mayor's comments that they should have the engineer analyze
some other project arrangements and then select the most economical
arrangement. To date we have concentrated on one project arrangement at
Chester Lake and APA could look at other possibilities, report back to
the community and then recommend and select the most desirable option.
Mayor Nelson said he was concerned with the end cost to the consumer and
thought the selection should consider that costoFinancing terms would be
a concern of the community.
Mr. Dean summarized that several financing options are under
consideration by the Legislature and it would be important for
Metlakatla to make its concerns known to their legislators and the
Governor. John Leask asked if APA could loan money to the community for
project construction. Mr. Petrie replied that APA could not under the
current grant program and that the Legislature would have to authorize a
loan.
Mr. Petrie reported that APA staff had reviewed t~e report and that
based on economics, the report showed Chester Lake to be superior to
diesel generation. Their calculations showed that the project would
4
meet the five percent rate of return test for fundino under current
legislation. This project appeared to be competitive with diesel
generation from the day of start up in 1985, which is not always the
case with other projects where the crossover with diesel alternatives
may be two to five years after start up.
Solomon Atkinson said he did not see how Metlakatla could afford to
wait any longer since costs would go up. He recommended proceeding with
Chester Lake and trying to get favorable financing terms from either the
State or REA, and asked Mr. Yost of REA for his opinion. Mr. Yost said
he was surprised at the cost increases since the 1977 report, but that
they seemed in line with today1s costs a~d those costs would increase
this coming year. Jack Booth said that smaller project options should
be examined. Mr. Yost said smaller projects may produce less usable
energy and that should also be considered in the financial analysis.
Solomon Guthrie said he agreed with Solomon Atkinson and thouoht
work should proceed with some cost cutting measures included. As an
example he said the road might be included at a later date.
Mr. Booth asked about the rate of return on the project cost. ~r.
Petrie explained that the five percent rate of return was a paper test.
The actual cost charged under current law would be a postage stamp rate
based on the costs of operating all APA projects. If the State built
the Chester Lake project, its operating and maintenance costs would be
pooled with the costs of other projects and a single postage stamp rate' .
would be charged for all energy sold from those projects. Mayor Nelson
asked if one project was losing money and another was making money would
rates on all projects be raised to cover the money loser~. Mr. Yost
offered an example of the Solomon Gulch project near Valdez where O&M
costs are 1.3t/Kwh and a hypothe~ciJ Ch~ter Lake project with O&M
costs of say 4.0/Kwh. Their O&~would be~$ totalled then divided by
the total energy produced. The resulting cost might be 2.0t/Kwh and
therefore the low rates might be increased as more expensive projects
are added to the pool.
Mr. Dean pointed out that the payback of only O&M costs would be
the situation only if the State owned the project at Metlakatla and
those arrangements would have to be negotiated. ~e asked how operation
would be handled. Mr. Petrie replied that O&M would likely be
contracted back to the local utility and APA did not envision placing
its own O&M personnel in Metlakatla. APA may have some of their own
operators at larger projects, but Chester Lake would be operated by
remote control from Metlakatla Power & Light. Mr. Dean asked if the
State had to be the sole owner or could they be a joint owner. Mr.
Petrie replied that he thought a joint ownership arrangement was
possible where distinct parts of the project were owned or liened by
separate financial backers. Mr. Dean wondered if the State and
community could own undivided interests in the facility. Mr. Petrie
said he would have to research that issue. Mr. Dean said if that was
possible, then Metlakatl ~nd APA might set up a local operating
authority that would ex~ on paper to own and operate the project.
5
Mr. Atkinson felt Metlakatla should present a request package to
their legislators very quickly. Mayor Nelson summarized the consensus
of the meeting so far appeared to favor going to Juneau and urging grant
funding for this project. Mr. Dean pOinted out that if the State owned
the project or a part of the project then there would need to be
negotiations on ownership and use of lands. Mr. Atkinson said all
options should be examined and that Metlakatla should try to secure
favorable financing from REA since the terms were different than State
financing.
Mr. Dave Horton of the Bureau of Indian Affairs asked if once rates
are set for the O&M payback can they be changed at later date.
Mr. Petrie said yes, the rates are subject to annual review. The O&M
cost will generally rise with inflation as labor costs go up. The
addition of new projects to the State power pool with different O&~
rates would also require adjustment.
Mayor Nelson asked Mr. Yost if REA would have any problem with
joint own~rship of a project which might involve Metlakatla, the State,
and REA funding. He said joint projects had been financed by REA
before. At the present time the APA is not an eligible REA borrower as
is Metlakatla. Mr. Dean said this is an issue that would have to be
addressed during joint ownership negotiation. Mr. Dean requested a
letter from APA which identified the dollar amount that would be needed
for construction. Mr. Petrie said APA could provide such a letter ann
that funds needed to meet oblioations on the Chester Lake storace
project would be about $16.8 million ~or a 1985 on-line date. -
Mr. Booth asked if APA could compute the retail power rates with a
combined Chester Lake, Purple Lake, diesel system. Mr. Petrie said he
didn't think APA could without knowing a lot more about the distribution
system. Their cost of energy projections project generation costs only
and the distribution costs have to be added on to that. Oistribution
costs in Metlakatla are now 2.5¢ -3¢/Kwh. If distribution plans do not
change significantly that cost could be added to the computed system
generation cost to get a good idea of the retail rate.
The issue of ownership came up again. Mr. Petrie said it would be
helpful if Mr. Dean could prepare a letter for the community to send to
APA with a list of questions where written responses would be helpful
for all involved. An appropriate time to address those would be after
the Legislature and Governor had acted on the budget so the funding
circumstances would be more clear.
Al Yost noted that the schedule allowed ten months between
beginning of design and mobilization for construction and wondered if a
January 1983 mobilization date could still be met if design did not
start until July 1982. Mr. Meagher replied that it would be very tight
and a January date could probably not be met but that the documents
could still be prepared to make effective use of the 1983 construction
season using a March mobilization date.
Solomon Guthrie asked another question about rates. Mr. Meagher
said there would likely be an increase in rates but the magnitude was
6
dependent upon the financing scheme that was available to fund the
project. With REA financing the rates would be quite higher than
present cost, but with State financing the project would be State owned.
Solomon Atkinson asked that an exhibit be included which showed the
escalated costs. Mr. Petrie and Mr. Meagher said that could be done.
Mr. Petrie asked questions on the use of wood heat in the community
and what was planned for the new housing units that would be installed
in the near future. Mr. Guthrie said that wood stoves were installed in
most of the new units in addition to electric heat. Mayor Nelson said
heating alternatives other than electricity may need to be examined if
the financing terms greatly increased energy costs. Mr. Petrie asked
about insulation in the new housing stock. Mr. Guthrie rep1ied that a1l
new homes were well insulated. Mayor Nelson added that all home wa1ls
were of 2x4 construction and he on1y knew of one home in town with six
inch walls.
The meeting adjourned about midnight.
7
CHESTER LAKE PROJECT
Attendence: 6th Session of the Council of 1982
February 18, 1982
NAME
Leandro A. Guthrie, Sr.
Frank R. Hayward
Melbourne A. Booth
Pat Wi 11 i ams
Jack Booth
Robert K. Henson, Sr.
Solomon Guthrie. Sr.
Richard Meagher
Solomon D. Atkinson
Brent N. Petrie
Casey Nelson, Sr.
H. Bobo Dean
Rosebelle G. Nelson
Reggie Atkinson
Bob Ridley
Warren G. Dorland
A 11 an K. Yost
Ronald Nilan
Gordon S. Thompson
Russell Hayward
Greg Argel
Dave Horton
Lou Riggs
REPRESENTING
Councilman
Councilman
Councilman
Councilman
Councilman
Councilman
Councilman
Harza Engineering Co.
Councilman
Alaska Power Authority-Anchorage
Mayor
Attorney, Metlakatla
Secretary
MP & L Board of Directors
MP & L Board of Directors
MP & L Manager
R.E.A. -Anchorage
M.I.C. Staff
M.I.C. Staff
MP & L Board of Directors
BIA Field Representative
BIA Forester -Juneau
Council man
R.E.A. -Seattle
J
.-;:~::.\ United Slates ({tAj;' Department
~. of Agrlcu:ture
Rural
Electrification
Administration
Mr. Brent Petrie, Project Manager
Alaska Power Authority
334 West 5th Avenue
Anchorage, AlasJca 99501
Dear Brent,
Wastllngron
DC
20250
P.o. Box 72)4-
Bellevue, Washington
February 24, 1982
1 19::
98007
As you requested, I am providing you with comments on the Chester Lake feasibility
study. Although II&llY of these collUllents were brought out by others during our meeting
with the Metlakatla Indian Council, they are being repeated in this letter because
I feel that they should be addressed in the final version of the Chester Lake report.
My cOllUllents are as follows I
1. Reference is _de to RE'A Type 408 construction on page V-12 of the repon.
I have checked with the REA Distribution Standards Branch and they are not aware of
any such construction standard. We have concluded that the nUllber (804) lI&y have been
transposed to (408) since the REA Form 804 contains construction drawings for 7.2/12.5kV
distribution line structures.
2. During our February 18th meeting, _ny questions were raised regarding the
issue of available financing alternatives. Although a verbal explanation was given
on this topic during our meeting, it is my opinion that such an explanation should
have been included &8 part of the report. In addition, it would have been interesting
to see the results of a sensitivity test for each financing sch .. e on the bus bar costs.
Results shown as costs per KWH would have added to the clarity of the report.
J. Severa.l questions were raised concerning how ¥holewe power rates would be
determined if the entire project were built with State grant fUDda. For exaaple, one
person wanted to know if the residence of Metlakatla would ever find theaaelves
subsidizing the operating costs of other projects in the State of Alaska under the
proposed rate fonaula. A brief explanation of this proposed rate formula would
resolve aany such questions.
4. From an operatioD&l. standpoint, it is ay opinion that it would be better to
~..a.ve two g.n ....... tors of equal size rather than one large generator a.t Chest.r Lak.. In
the .vent that one gen.rator ahould break down, the co_unity would be able to continue
using the other UD1 t •
5. It is ., opinion that the site selected for the location of the powerhouse
was the best. However, in order to rule out oth.r s1te locations, perhaps a cost
verses benefit analysis should be done with the powerhouse located at a site closer
to the Walden Point ROad. Are there any alternate routes for the propos.d road that
would lower the cost of the p;-oject '? Would BIA funds be available for this road if
the road were to be used as a logging road in the near future'? Would barge constructior
be ~ore economical?
United States
Department
of Agriculture
Rural
E lectnflcatlon
Administration
Mr. Brent Petrie, Project Manager
February 24, 1982
Washington
D.C
20250
6. A fairly good analysis vas included in Chapter lIon historical demands
and historical energy consumption levels. However, I am afraid that the impact
on energy usage vill be greater if, for example, the retail cost of electricity
doubles. It is my understanding that the retail cost of electric energy vill go
up substantially if funding for this project from the State does not materialize
or if REA does not provide a dificiency loan (at 5t) for the reyised estimate.
If that were to ever happen, I believe that the per consumer energy usage at
Metlakatla vould approach the Ketchikan per consumer energy usage level. This
means that the present cons~ptien lev~l in the low scenario is too high. If the
average energy usage were to drop to the Ketchikan levels, it would probably be
better to build the Chester Lake project in stages as the Purple Lake project vas
done. In other vords, consideration should be given t.w.rm building the dam and
the penstock to accommodate a 3 MVA poverhouse. However, instead of installing
a 3 MVA unit nov, perhaps a 1.5 MVA unit should be installed vith provisions for
installing another 1.5 MVA unit at a later date vhen the demands necessitate it.-
I hope these comments ~re of some value to you.
~ 1h~ " C, ~)') 1
Louis E. Riggs
REA Field Engineer, Alaska
~r. Brent Petrie
Alaska Power Authority
JJ4 West 5th Avenue
Anchorage,Alaska 99501
Cl~~,-,-Lc.'_(.·(~··-,.;:.
el 2-
March 2, 1982
r ... ' -I ,
On February 18, 1982, a lIeeting _s held in Metla.katla, Alaska with
representatives of Harza. Engineerinl. Alaska. Power Authority, REA and the
Metlakatla Indian Council. The purpose of this meet1n& _s to review and
discuss the draft feasibility report on Chester Lake prepared by Harza
Engineering Co~ny. The following comments are submitted in conjunction
with that meetingl
1. The Energy Forecasts prepared under three different scenarios, low,
most likely and high, appear satisfactory and we would concur with the
estiDBted projections under the ~iost L1lcely Energy ForeCAst condition. However,
it should 'be kept in .ind that if Chester lAke is constructed, retail rates
in the future will surely increase which could lead to reduced consumptio~'
in the community. In addition, in discussions with the ~Ayor, ~~. Casey Nelson,
an energy conservation program is to 'be conaidered 'by the cOllUllW1ity which
could further result in reduced energy deman A.
2. The cost estimates included as part of the report estimate construction
costs of the project at January 1982 price levels. It did not expand the costs
to include price escalation 'be;)lond that date or include interest during
construction. We would recolllllend that the final report include the total cost
of construction, including LX, through the on line date of January 1985.
J. Considerable discussions occurred. during the meeting concerning various
f'1nancing arrangmenta including 100% REA financing, 100% APA f1nancing and a
possibility of joint financing 'between REA and APA. It would seell the report
should include a section indicating the total project costa based on at least
three different financing alternatives and at least three different interest
levels, such as 5~, ~ and 12%.
4. The report included an economic e'Valuation which compared. the costs of each
alternative power project over the project life of tbat project using parameters
establ1ahed. ~. APA. Although we have no problem with this, we would a1.&o 11ke
to see & coat of pORr analya1a tor Mch ca.e which' would 1nd.icate the overall
bus bar coat of energy auUJR1ni 'Various interest za tes.
5. ~r1ng the .eting on Feb%uary lB, there were alao discussions concerning
how the wholesale power zate would 'be developed. for Chester Iake assuming APA
finances the entire project. '!berefore, the tinal report should consider an
additional section describing the wholesale power rate derivation under
current legislation.
2 -' APA
6. Alao during the meeting, there 18S considerable discuss10n regarding
poss1ble .ed1t1cat10ns to the proposed project in an attempt to lower the
construct10n costs. Ite. discussed included. butwere not lim1ted tOI lowering
the height of th8 propoeed concrete daa, adding only one 1.5 MW un1t and
incr.sing the capac1ty of Purp~e lAke. Although we have no object10ns to
analyzing other a.ltemat1ves, we do not th1nk 1t would be economically prudent
in the long term to alter the Cheater Lake Project as 1t currently 1& proposed
by Barza Engineering.
7. On September 15, 1980, REA prepared. an ihvUonHntal A .... s .. nt for the
proposed project and r.ched a F1nding of No S1«n1f1cant lIlpact. 'lbe proposed.
project at that t1ae viaua11Hd a rock f1l1 da. would. be conat.%'\lcted. below
the existing Chester take dam. Harsa currently proposes to construct an
~8 ~RP~ h1gh concrete arch-grav1ty daa across Waterfall ereek. V11l the
proPosed. change 112 dam construct10n affect the or1g1m.l FONSI reached. by REA
in September 1980?
8. Quest10ns regarding ownersh1p of the Chester lake Project were alao
brought up during the course of the .. eting. It .. y or _y not be appropriate
to d1scuss th1s 1tem in the final report.
9. Page v-6 of the draft report 1nd1cates a re1.nforced concrete faCing for
a rock-f1l1 dam 1s another ch01ce although repair to the con:rete faCing requ1res
reserv01r draw-down. Before th1s alternat1ve 18 completely rluled out, 1t
would seem appropriate to ind1cate how frequent this would have to be done and
how long the concrete facing would last before _jor maintenance was necessary.
10. Based. on discuss10ns w1th Mr. Charles Ph1lpott, foanager Western Area -
Electr1c, on March 2, 1982, we understand that add 1 t10nal comments w111 be
forthcom1ng trom ~.
Thank you for the opportun1ty to cOlDlllent on the feas1b1lity report. We
beHeve the joint .. eting with the Metlakatla Indan Council 18S very
informat1ve and well worth the t1me and effort.
lJ.lt.~ .Y. j.~
Allan K. JOISt
Operat10ns Field Representat1ve
REA
UNITED STATES
DEPARTMENT OF THE INTERIOR
BUREAU OF INDIAN AFFAIRS
Juneau Area Office
P. O. Box 3·8000
Juneau, Alaska 99802
March 16, 1982
HARZA ENCINE£RlNG co .
Harza Engineering Ccmpa.ny
Attention: Yr. Gene Kocinian
150 South Wacker Drive
Chicago, Illinois 60606
Dear Mr. Kocinian:
~ate Received
~,: .:=.d To
. : :1:·,,;1 !Jr fUing b,
~:.)~1 HI1::~ar
C •. L;~,::1:~Jl
.J/;9/f~
The Bureau of Indian Affairs, Roads Section, reviewed the Walden Point
road file and found three or four field surveys were canp1eted between
1967 and 1970. The contilDl1ng centerline to the powerhouse was very
steep, difficult and questionable, due to tallis slide paths.
Enclosed you will find xeroxed copies of field pictures; a typical cut
section; earthwork canputations (of the latest field survey); engineers
esti.nB.te (tased on 1968 costs) and general mp showing road constructed
to date.
Gene, if you recall, I said our last rwte would require the following
ideas in addition to the enclosed engineers estin:a.te:
1. 1,800 lineal feet retaining wall
2. 1,800 lineal feet of waterline relocation
3. 1,800 lineal feet of rock excavation
4. UDknown -tallis slide path control
At this time tbe BIA, Roads Section, would e1imdnate items 200 (3); 310
(3); 317 (1); aDd 317 (3). Paving roads in Alaska is expensive as an
or1&1D&l first cost, rut this cost is multiplied lIII.IlY tiDes when mint~
nance starts and the remote carml1ni ties just do not have the necessary
traffic camt to support this coostruction.
2
My staff estilrates the BIA route would exceed 1.75 million dollars at
todays ooostruction costs.
If we can be of furtber service, please call the Roads Section at:
586-7386.
Sincerely,
~.c c..f' ~.-tf(...1-e .. ,,/~, (i:~', )
QUef, Roads Section
cc: S. E. Agency
Chief. DiVision of. Special Services
QUe!. BranCh of Econcmi.c Devel()J;:ll:ent
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Area Road Engineer
Approved Sy: ________ ~ __ ----__ --------
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. !
-BEGINNING OF
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61+50
CHESTER
LAKE
~PPROVED
STATE
of ALASKA M£MIJIlANIJI. :ff (,....... ~ ,
-'-~ ... ~('
TO: rBrent Petri e
,~1aska Power Authority
/ George Matz, Program Analyst
FROM:Division of Budget and Management
Office of the Governor
DATE:
FilE NO,
TELEPHONE NO:
SUlUfCT,
RECEIVED
March 16, 1982
···t261~---.
ALAt:'v~ !)"'lJ'~_
" -•. l '-.~:. AL'~.'" ,
1 ••• 't, , 1
Chester Lake Feasibility Study
Thank you for sending a draft report of the Chester Lake Hydroelectric Project
feas i bi 1 i ty study. You previously requested that Budget and Management
provide comments on draft reports to provide greater assurance that the final
copy will have no Significant deficiencies relative to the review process.
The purDose of this memo is to provide such comments. However, this memo
should not be considered as the review required by Budget and Management.
Generally speaking, the draft feasibil Hy study provides the type of
information that is required. However, there are some areas which should be
improved to assure compliance. These are:
I Baseline Data
A. Although the Triangle Lake Project is not the preferred alternative,
some of the data is too general for a feasibility study. No average
annual runoff data is provided and it is not clear that Triangle
Lake would receive the same precipitation (because of rain shadows)
as Purple Lake. Also the environmental data is cursory. Statements
regarding minimal stream flow to protect fisheries, location of
eagle nests, other habitat consideration and possible archacological
sites need to be supported with data.
B. The feasibility report does not mention whether stream gages have
been installed in the outlet of Chester Lake. Although it seems
reasonable to use Purple Lake data to estimate runoff for Chester
Lake, actual data would be desirable.
II Energy Demand
A. The demand projections and net energy balance provide good
information to support demand projections. One factor brought out
is the influence of federal spending (BIA funded hatchery and HUO
funded housing) on the development, and energy demand, of
Metlakatla. Although federal spending estimates always have an
element of uncertainty, the likelihood of federal funds may be more
certain than portrayed by the draft feasibility study.
1.
II.
Diesel Generation System
Investment Costs
A. Generation
1. Assumptions
a. Economic life of diesel generators
b. Installation costs (Skw)
c. Inflation rate
d. Reserve margin
2. Annual cost data
a. Peak demand -kw
b. First year capacity
c. Expanded capacity -kw
d. Expanded capacity -(SOOO)
e. Replaced capacity -kw
f. Replaced capacity -($000)
g. Total capacity -kw
h. Total costs -(SOOO)
B. Transmission and Oistribution
1. Assumptions ..
a. Number of miles of transmission line categorized by type of
terrain and with and without road access.
b. Cost per mile of transmission line (including poles, fixtures,
overhead conductors and devices) for each category.
2. Annual cost data
a. Right of way acquisition
b. Transmission line installation
c. Substations .
d. Distribution system upgrade, if applicable
e. Total costs
Operation and Maintenance Costs
A. Generation
1. Assumptions
a. Inflation rate
b. Ffxed costs -$/kw
c. Variable costs -t/kWh
2. Annua 1. cost data
a. Fixed costs -(SOOO)
b. Variable costs -(SOOO)
c. Total costs -(SOOO)
B. Transmission and Distribution
1. Assumptions
a. Inflation rate
b. Cost variances due to terrain and access
2. Annual cost data
a. Fixed costs -($000)
b. Variable costs -(SOOO)
c. Total costs -(SOOO)
III. Fuel Costs
A. Assumptions
1. Assumpt ions
2. Base price for fuel oil
3. Fuel escalation rate
4. Efficiency -kwh per gallon of fuel oil
B. Annual cost data
1. Diesel net generation -MWh
2. Fuel oil used -gallons
3. Price of fuel oil -$/gal.
4. Fuel Cost -($000)
,"
Hydroelectric Project
I. Investment Costs
A. Generation
1. Assumptions
a. Economic life of project
b. Construction start-up date
c. Construction completion date
d. Inflation rate during construction
2. Construction costs
a. Nominal costs for each year of construction
3. Other generation systems
a. In addition to the hydroelectric project, other generation
systems may be needed to meet demand or reserve requirements.
The investment costs for supplemental generation systems should
be presented separately under the respective system.
B. Transmission and Distribution
1. Assumptions
a. Number of miles of transmission lines categorized by type of
terrain and with and without road access.
b. Cost per mile of transmission line (including poles, fixture~,
overhead conductors and devices) for each category.
2. Annual cost data
a. Right of way acquisition
b. Transmission line installation
c. Substations
d. Distribution system upgrade, if applicable
e. Total costs
II. Operation and Maintenance Costs
A. Generation
1. Assumptions
a. Inflation rate
b. Fixed costs -$/kw
c. Variable "to.sts -¢/kWh
2. Annual cost data
a. Fixed costs -(SOOO)
b. Variable costs -(SOOO)
c. Total costs -(SOOO)
3. O&M ccrsts for other generation systems, needed to supplement the
hydroelectric project, s~ould be presented separately under the
respective systems.
B. Transmission and Distribution
1. Assumptions
a. Inflation rate
b. Cost variances due to terrain and access
2. Annual cost data
a. Fi xed costs -(SOOO)
b. Variable costs -(SOOO)
c. Total costs -(SOOO)
II 1. Fue 1 Cos ts
A. Assumptions
1. A hydroelectric project may need supplemental generation to meet
peak and/or energy demar.d. If the supplemental generation system
uses fuel, the fuel costs are to be included in total costs.
Fuel costs include the following:
a. Fuel consumption needed to meet thE difference between annual
energy demand and average annual energy generated from the
hydroelectric project.
b. Fuel consumption needed to meet the difference between seasonal
energy demand and seasonal variations in the capacity of the
hydroelectric project excluding differences described in (a).
B. Annual cost data
1. If fuel costs are incurred, the costs should be presented
under the respective generation system.
IV. Reserve Capacity
A. Assumptions
1. If the hydroelectric project is the largest generating unit for a
service area, reserve capacity equal to the lessor of peak demand
or the projects installed capacity is generally needed to assure
firm power. (Interuptable rates can reduce the amount of reserve
capacity that is needed). Consequently, the capital, operation an~
maintenance, and fuel costs of the reserve capacity are to be
included in total cost estimates.
B. Annual cost data
1. The costs for reserve capacity are to be included under the
generation system that ;s to be used for this purpose .
..
Mr. George Matz
May 18, 1982
Page 2
While there would be some-short term job potential in
weatherization we feel lifestyle changes are a more significant
factor in heating energy utilization and, therefore, we do not plan
to have the consultant estimate the number of short term jobs.
IV. Economic Evaluation
A. We will prepare a summary sheet of costs and assumptions for
the final report in a manner similar to the example.
B. Chester Lake would still be used as a water supply as it has
for many years. Since the project would not provide a new
water source nor affect the aIM costs of the existing system
or an alternate system and since cost was a consideration in
our contract with the consultant, we did not conduct further
evaluation of the water supply at Chester Lake.
C. A major refurbishing of the Purple Lake plant was scheduled
for the year 2011 of the economic analysis. This is explainlQ
on page IV-2 of the draft report and is reflected in higher
fixed costs for Purple Lake hydro beginning in year 2011 of
the economic analysis.
D. The transmission system from this project is only one-half
mile long and may last more than the twenty year period of
analysis. Your suggestion is well taken and will be
considered in the final report. You might also note that we
replaced the reserve diesels every twenty years in the
preferred plan. This would tend to artificially increase the
calculated cost of the preferred plan. In actuality reserve
diesels should outlast diesels that are used for continuous
generation.
VA. We did not make the normal draft distribution of this report since
Metlakatla has already applied for and received an exemption from
the Federal Energy Regulatory Commission licensing for this project
and has obtained the necessary permits to construct the project.
The Corps of Engineers 404 permit required extensive agency
coordination prior to issuance. The significant difference from
the 1977 feasibility report and this report is in the powerhouse
location and cost estimate. However, these changes did not result
in significant differences in environmental concerns or impacts.
The state library and agencies will receive a library copy of the
final report.
VB. We conducted a public meeting in Metlakatla on February 18, 1982
which twenty three people attended. As a result of that meeting we
directed the consultant to examine the effects of road access
Mr. George Matz
May 18, 1982
Page 3
elimination on cost and to analyze a low dam run-of-the river
concept and compare it to the storage project. These analyses will
be included in the final report.
Thank you for your comments on the draft report. They have been
helpful in preparing a thorough and complete final report.
BNP:mlj
j
1
TO: Brer.t Petrie
Alaska Power Authority
334 West Sth Avenue
Anchorage, AX 99S01
MEMORANDUM
DATE: April 22, 1982
PHONE: (907) 886-6661
FROM: Warren B. Dorland,
Metlakatla Power &
Lake Feasibility St~~
Thank you for your diligent personal assistance for the Alaska Power Authority in
moving the Chester Lake Hydroelectric Project Feasibility Study along to it's
near completion: This study being a sta~utory requirement of the State of Alaska
prior to it's financial contribution andcarticipation in the implementation of
the Project Design and/or Construction. A consensus summary of comments emerging
at the Metlakatla governing bodies meeting held February 18, 1982 was that:
1. The project as recommended by Harza was desirable and satisfactory
technically.
2. That a financially ~rec do~m Project should be inclded in the
Feasibility Study final fOrLl as funds might not be available for
the Project at an estimated cost of approximately 16 million
dollars. (U. S. )
3. That alternatives studied for recommendation by Harza, the selectee
en~ineers, should incluce smaller ca?acity Chester Lake storage and
a run-of-the-river type ProJect.
..
Contract No. CC08-2269, dated October 21, 1981, between the Alaska Power Authority
and Harza Engineering Company for the Feasibility Study with the appendix B-1,
Scope of services, in CC 08-2269 amendment, number two seems adequate in scope for
the Feasibility Study's purpose. And the scope contains sufficient specifics.
Comments by all parties on the Draft Study are addressed.
1. Metlakatla Governing Bodies & Officers
2. R. E. A. Officials
3. Metlakatla Power & Light Board & Management
4. Other interested persons.
S. Diyision of Budget & Management, Office of the Govenor
We in Metlakatla are anxiously anticipating the final version of the Feasibility
Study, due out May IS, 1982.
MEMORANDUM State of Alaska
TO:
FROM:
Mr. George Matz
Program Analyst
Division of Budget and
Brent petrie#
Project Manager
DATE: May 18, 1982
Management FILE NO:
TELEPHONE NO:
Chester Lake
SUBJECT: Feasibll ity Study
Thank you for your comments of March 16, 1982. In response to your
memo we have the following. The numbering corresponds to those of your
memo:
IA. BASELINE DATA -You are correct that the data on Triangle Lake
is much more general than that for Chester Lake or Purple Lake.
The lake and watershed were visited by project engineers and
geologists, and was examined from the air by hydrologists and
fishery specialists. Even under the most favorable
environmental and hydrologiC conditions this alternative provides
more costly energy than Chester Lake and was therefore screened out
as not as desirable as Chester Lake.
lB. There are no stream gages at the outlet of Chester Lake, but there
is a water supply line to the village of Metlakatla and the lake
has been used for hydropower in the past. Since Purple Lake is so
near Chester Lake, and has a similar orientation, and since some
idea of flow is available from the water supply operation at
Chester Lake, I do not believe a gage at Chester Lake would provide
a significant improvement in the reliability of the extrapolated
data in this case.
II. Energy Demand
A. Agreed
Band C. We are also aware of the apparent sensitivity of demand
to rates in Metlakatla from our review of the draft report. We
also feel the end use showing the largest response to rate changes
is electric space heating. We have instructed the consultant to
address this issue in the final report with special attention to
alternative space heating modes.
III. Alternatives
A. Conservation was considered by reducing the per customer demand
in the load forecast. Items one and three will be considered in
the final report. Since much of the housing stock in Metlakatla is
relatively new and, from testimony at the public meeting, is also
well insulated, we feel most of the conservation measures in
Metlakatla will result from changes in energy use habits in
response to rates rather than structural or insulation additions.
APPENDIX E
I.
II.
APPENDIX E
CHESTER LAKE PROJECT -DATA
(2.5 MW -El. 885)
Capital Costs
A. Generat ion
1. Assumptions
a. Economic Life of Project
b. Construction Start-up Date
c. Construction Completion Date
d. Interest During Construction
e. Base Year for Estimates
2. Construction Costs
a. Year
b. Capacity Addition
c. Capital Cost-Generation Only
3. Other Generation Components
B. Transmission and Substations
1. Assumptions
a. Length
b. Cost per mile
c. Base Year for Estimates
2. Facility Additions and Cost Data
a. Year Constructed
b. Right of Way Acquisition
c. Transmission Line Installation
d. Substation and Transformer
e. Total Capital Costs
Operation and Maintenance Costs
A. Generation
1. Assumptions
a. Base Year for Estimates
b. Fixed Costs
c. Variable Costs
2. Annual Cost Data
a. Year
b. Fixed Costs
c. Variable Costs
d. Total Costs
B. Transmission and Substation
50 years
January, 1983
January, 1985
See Financing
Plans
January, 1982
1985 on-line
2,500 kW
S12,902,000lJ
See main report
0.5 miles
S190,000lJ
January, 1982
1984
None
S95,000lJ
S143,0001/
S238,0001/
1982
S26/kW
SO/kWh
1985
S65,000
S65,000
Included above
!/ Including contingencies, engineering and owner's cost.
APPENDIX E (Cont'd)
CHESTER LAKE PROJECT -DATA
(2.5 MW -El. 885)
III. Fuel Costs
A. Assumptions
1. Diesel Fuel Cost
2. Cost per kWh
B. Annual Costs
IV. Reserve Capacity
$1. OS/gal.
$O.09/kWh
See main report
See main report
- 2 -
B. Metlakatla has demonstrated sensitivity to price increases in
electricity. Assuming that the marginal costs and price for
additional capacity will be higher than existing costs and price,
more thorough analysis of price elasticity should be included in the
feas i bi 1 i ty study. The draft study seems to acknowi edge pri ce
elasticity by projecting a slight decrease is per customer
consumption but the rationale needs further development.
C. The effects of electric space heating deserves more detailed
evaluation. Does residential e1ectric space heating result in
higher peak loads requiring more reserve capacity and/or diesel
generation? How can these peak loads be reduced? The recent
dependence on wood stoves to partially meet space heating needs is
mentioned but how can wood stove be used to reduce peak demand and
electric costs? Should other strategies, such as demand metering.
firewood harvesting or conservation be part of a comprehensive power
plan? Also, if larger buildings convert to electric space heating.
what will be the impact on peak demand?
III Alternatives
A. The potential for energy conservation was not considered. Although
local options for energy conservation are not often a significant
factor in the electric demand of rural villages, Metlakatla is an
unusual case because of its extensive use of electricity for space
heati ng. The opportuni ti es and economi cs of energy conservati on
should be discussed as part of the base case or as a separate
alternative. (Perhaps energy conservation would be a more viable
alternative than the Triangle Lake Project.) This would require
some estimate of the heat retention of the existing housing stock
and the magnitude of reductions that can be economically achieved.
The potential for using heat pumps should also be discussed as part
of an energy conservation plan. Significant questions which should
be addressed includes;
1. Can energy conservation make a Significant contribution to
Metlakatla energy needs?
2. Will conservation practices create short term job opportunities
for the residents of Metlakatla?
3. Does reduction in energy demand, via conservation, affect the
timing as to when the Chester Lake project should be
constructed?
IV Economic Evaluation
A. The economic evaluation may include all costs but some costs and
assumptions are not explicit. Attached are examples of what costs
and assumptions should be mentioned in the feasibility study.
v
- 3 -
B. Under the preferred plan, it appears as if Chester Lake would still
be used as Metlakatla water supply. Would any additional benefits
accrue because of this? If so, these benefits should be estimated
and treated as offsets to the cost of the Chester Lake Project.
C. It appears that the economic analysis assumes that Purple Lake will
continue to operate throughout the 50 year life of the Chester Lake
Project. Doesn't this exceed the economic life of the Purple Lake
Project? What refurbishing costs are needed to extend the economic
life of the Purple Lake Project? ~.,A
D. APA criteria assumes that the economic life of a transmission line.",.J>~
is 20 years. Are replacement costs for the transmission line --~
included? Perhaps it would be more realistic to assume that the
transmission line will last the life of the project with replacement ... /
costs included under Operation and Maintenance costs. ~ ~.
E. APA regulations require that the present costs analysis extend over ~ ,,11
the economic life of the project. Since the base case includes . 1'1': J
diesil generation, which has a 20 year economic life, the present ,-~ ~
costs for a 20 year period should be included in the economic Ii' p: ~ .
analysis. ~ I
Review r
A. The distribution list for the draft study did not include all
interested state or federal agencies. These agencies should also be
given the opportunity for review.
B. A public meeting is required for reconnaissance studies. Since the
reconnaissance study for Chester Lake is rather dated and completed
before this requirement, it would be desirable to conduct a public
meeting in Metlakatla on the draft study. The final report should
include relevant comments.
Thank you for the opportunity to comment on the draft feasibility study.
Hopefully, these preliminary comments will result on a more comprehensive and
acceptable final version. As previously stated, the questions brought out in
this memo should not be interpretated as Budget and Management review of the
feasibility study.
I
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EXHIBIT B-22 Page'1 of 13 ... '.