HomeMy WebLinkAboutAPA1372I
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SUSITNA HYDROELECTRIC PROJECT
Prepared by:
FERC LICENSE APPLICATION
EXHIBIT C
FIRST DRAFT
SEPTEMBER 24, 1982
._____ALASKA POWER AUTHORITY_---...l
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EXHIBIT C -CONSTRUCTION SCHEDULE
TABLE OF CONTENTS
List of Figures
Page
1-SCHEDULE DEVELOPMENT ··~································Q··· C-1
1.1-Watana Schedule· ....................•..••.......•...•.. C-1
1.2 -Devil Canyon Schedule . . . . . . . • . . • . . . • . . . • • . . . . • • . .. . . •. C-3
1.3-History of Existing Project •..••.. : •...•...........•• C-4
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EXHIBIT C -CONSTRUCTION SCHEDULE .
LIST OF FIGURES
No. Title
C.l Watana Construction Schedule
C.2 Devil Canyon Construction Schedule
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EXHIBIT C -CONSTRUCTION SCHEDULE
1 -SCHEDULE DEVELOPMENT
This section describes the de~1elopment schedules prepared for both
Watana and Devil Canyon to meet the on-line power requirements of 1993
and 2002~ respectively. These schedules span the period from 1983
until 2004. Schedules for the development of both Watana and Devil
Canyon are shown on Figures C.l and c:2. The main elements of the
project have been shown on these schedules, as well as some key
i nterrel at ionshi ps. For purposes of planning, it has been assumed that
a license will be awarded by December 31, 1984o
At both sites the period for construction of the main .d~m is critical.
Other activities are fitted to the main dam vmrk. A study of the front
end requirements at Watana concluded that initial acce~s work should
commence immediately after award of a license to construct and operate
the project. This effort will lead to the earliest possible buildup of
manpower and equipment to meet construction requirements for early
critical path activities includin-g river diversion and the main darh •
1. 1 -Watana Schedule
Commencement of construction:
Initial access road
Site facilities
Diversion
Completion of construction:
-June, 1983
-January, 1985
-April~ 1985
Four of six units ready -Januar·y, 1994
Six units ready -July, 1994
Conmencement of col1lllercial operations:
Four of six units
Six units
-January, 1994
-July, 1994
The Watana schedules were developed to meet two overall project
constraints:
-FERC 1 icense waul d be issued by December 31~ 1984; and
-Four units would be on-line by the end of 1993.
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The critical path of activities to meet the overall constraints was
determined to be through site access, site facilities, diversion and
main dam construction. These are highlighted as follows:
{a) Access
Initial road access to site is required by October 1, 1985.
Certain equipment will be transported overland during the winter
months so that an ai rfi e 1 d can be constructed by Ju 1 y 1985. These
initial access efforts are required to mobilize labor, equipment,
·and materials in 1985 for the following major construction
activities:
-Main access road/rail head;
-Site facilities;
-Diversion; and
-Main dam.
{b) Site Facilities
Site facilities must be developed in a very short time to support
the main construction activities. A camp to house more than 1,000
men must be constructed duri.ng the first eighteen months. Site
construction reads and contractors• work area have to be started.
An aggregate processing plant and concrete hatching plant must be
operational to start diversion tunnel concrete work by May 1986 ..
Construction power supply must also be started in 1985 for
completion by mid-1987. One circuit of the permanent transmission
line should be built from the proposed inte·/tie at Gold Creek to
Watana.
(c) Diversion
Construction of diversion and dewatering facilities, the first
major activity, should start by mid-1985. Excavation of the
portals. and tunnels requires a concentrated effort to allow
completion of the lower tunnel for river diversion by September
1986. The upper tunnel is needed to handle the spring runoff by
1987. The upstrearn cofferdam must be placed to divert riverflows
in September 1986 and raised sufficiently to avoid overtopping by
the following spring.
(d) Main Dam
The progress of work in the main dam is critical throughout the
period 1986 through 1992. Mobilization of equipment and start of
site work must begin in 1986. Excavation on the right ab1Jtment
proceeds in 1986, as well as river alluvium under the darn core.
During 1987 and 1988, dewatering, excavation and foundation
treatment must be completed in the rive'rbed area and a substant i a1
start made on placing fi 11.
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The schedule has also been developed to take advantage of possible
early reservoir filling to the minimum operating level by October
1992. Should this occur~ power could possibly be generated by the
end of 1992.
1.2 -Devil Canyon Schedule
Commencement of construction:
Main Access -April, 1992
Site Facilities -June, 1994
Diversion -June, 1996
Completion of construction:
Four units -October, 2002·
Commencement of cornnerci al operations:
Four units -October, 2002
The Devil Canyon.schedule was developed to meet the on-line power
requirement of all four units in 2002. The critical path of activities
\-.ras determined to follow through site facilities, diversion and main
dam construction.
(a) Acc.:::ss
It has been assumed that site access facilities built for Watana
exist at the start of construction. A road will be constructed
connecting the De vi 1 Canyon site to the Hat ana access road. At
the same time, a railroad spur will be constructed to permit
railroad access to the south bank of the Susitna near Devil
Canyon. These activities will be completed by mid-1994.
(b) Site Facilities
Camp facilities should be started in 1994.
that buildings can be salvaged from Watana ..
could also be started at this time.
(c) D i version
It has been assumed
Site roads and power
Excavation and concreting of the single diversion tunnel should
begin in 1995. River closure and cofferdam construction will take
place to permit start of dam construction in 1996.
C-3
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{d) Arch Dam
The construction of the arch dam wi 11 be the most critical
construction activity from start of excavation in 1996 until
topping out in 2001. The concrete program has been based on an
average 8-month placing season for 4-1/2 years. The work has been
scheduled to maintain a fairly constant effort during this period
to make best use of equipment and man power.
(e) Spillways and Intake
The spillway and intake are scheduled. for completion by the end of
2000 to permit reservoir fi 11 i ng the next year.
· (f) Powerhouse and Other Underground Works
G
Excavation of access into the powerhouse cavern is scheduled to
begin in 1996. Stage I concrete begins in 1998 with start of
install at ion of major mechanical and electrical work in 2000.
{g) Transmission L ines/Switchyards
The additional transmission facilities needed for Devil Canyon
have been scheduled for completion by the time the final unit is
ready for commissioning in late 2001.
(h) General
The development of site facilities at Devil Canyon begins slowly
in 1994 with a rapid acceleration in 1995 through 1997. Within .a
short period of time, construction begins on most major civil
structures. This rapid development is dependent on the provision
of support site facilities which should be completed in advance of
the main construction work.
1.3 -History of Existirig Project
An intertie is planned to permit the economic interchange of up to 70
megawatts of power between major load centers at Anchorage and
Fairbanks. Connecting to existing transmission systems at Willow in
the south and Healy in the north5 the intertie will be built to the
same standards as those proposed for the Susitna project transmission
system. It will be energized initially at 138 kV. Subsequent to
construction of the Watana project, the intertie will be incorporated
into the Susitna transmission system and will operate at 345 kV.
Construction of the intertie began in October 1982. Completion and
initial operation is planned for September, 1984, well in advance of
the anticipated date for receipt of a FERC 1 icense on Decembet~ 31,
1984.
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DEscRIPTION
01
02 ll!iiTIAL .t.CCESI
03
06 saTE FACIUTIES
07
05 OIVERSIOH TUNNELS
09
12 UAINOAM
13
14 REl.IC'r CHANNEL
15
15 WAI~ SPILLWAY
17
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1983 19&4
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WATANA CONSTRUCTION SCHEDULE FiGURE C.r
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DESC"IPTION 1192. 1913 1994 M5 1996 IH7 . t .. I 1199 l 2000 2001 2002 I 2003 I
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I --------·----[i] . -DEVIL CANYON CONSTRUCT ION SCHEDULE FIGURE C.2
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