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SUSITNA HYDROELEC~PIC PROJEC7
FILE CCJPY
ALASKA POYJER AUTtfOR ITY
SUSITNA HYDROELECTRIC PROJECT
TASK 5 -GEOiECHN ICAL EXPLORATI Oi'!
REPORT DN 1980 STUDfES
DRAFT
MARCH 1981
Acres American Incorporated
1000 Liberty Bank Building
Main at Court
Buffalo, New York 14202
Telephone {716) 853-7525
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ALASKA POWER AUTHORITY
SUSITNA HYDROELECTRIC PROJECT
TASK 5 -GEOTECHNICAL EXPLORATION
SUBTASKS 5~01 -5.04
REPORT ON 1980 STUDIES
TABLE OF CONTENTS
LIST OF TABLES ef J•••~••••••••·••••••••••·•-a•••••••••••••••••••••••••••
Page
iii
LIST OF FIGURES •••••.•••.••••• o ....... * ....................... 2 • • • • • • • i v
1 - I r~TRODUCTI ON • • • • • • • • • • ••••••••••..••.•• o ••••• o • • • • • • • • • • • , • e ••• .a 1--1
1.1 -Project Descript~~ .n and Location .. . . .. . . . . . .. . . . . . . . . . . 1-1
1.2 ... Plan of Study······"·········,~··~····················· 1-2
-2 -SUMMARY AND CONCLUSIONS
2 .1 .. Introduction .............. ., .................. e. .......... .
2.·2 -Watana Sit·e . ,~ .................. ~ ...................... o •••
2 . 3 -Oev i 1 Can yon S i t e . . . • . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 -REVIEW OF PREVIOUS WORK
3.1 -Introduction .............................................. ...
3 • 2 ~ Wat an a • 0: ••••••• 1 • • • • • • •. • • • • .. • • • • • • • • ••• , • • • • •. • • • • • • • • • • •
3. 3 -Dev i 1 Canyon •.••.......•.. , ........ .o •••••• ~ ••••• " •••••••••
3.4 -Conclusions • • • • • • • • • • • • • ~ • • • • • • • • • • • • • • • • • • • ~ • ~ • • • • • • '0 •
4 -REGIONAL GEOLOGY
4 • 1 -Gen er a·l • • • • • • • • • • • • • • ... • • . • • • • • • • • • • • •. .. . • • . • . • • • • • • • • • • •
4.2 -Geologic Setting ..................................... ~
4.3 -Regional Structure ··~···············~··················
4.4 -Glacial History .......... o •••••••••••••••••••••••••••••
5 -1980 GEOTECHNIC.~L INVESTIGATION
2-1
2-l
2.-4
3-1
3-1
3-2
3-3
4-1
4-1
4-1
4-2
5 .1 -Genera 1 ....•. ., ................................ ~~ • . . . .. • • .. . 5._..1
5. 2 -Scope and ~ethodo 1 ogy ..•....•.•..•.•.....••.. : •......• ,. 5-3
6 -RESULTS OF THE GEOTECHNICAL INVESTIGATIONS
6.1 ... Watana ···················"'······························· s-~·1 6.2 -Devil Canyon ............................................ 6·I2
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ALASKA POWER AUTHORITY
SU~JTNA HYDROELECTRIC PROJECT
TASK 5 -GEOTECHNICAL EXPLORATION
SUBTASKS 5.01 -5.04
REPORT ON 1980 STUDIES . ~
TABLE OF CONTENTS (Cont 1 d)
REFERENCES
APPENDIX A -SUMMAQY OF PREVIOUS WJ~RK
8 -DIAMOND CORE DRILLING (R&M COt "!JLTANTS)
8-1 Drilling Reports
B-2 Water Pressure Testing
8-3 Summary Logs -
C -BORROW AREA INVESTIGATIONS (R&M CONSULTANTS)
C-1 Auger Drilling Reports
C-2 Laboratory Testing
D -SEISMIC REFRACTION SURVEY
D-1 1980 Investigation (WCC)
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LIST OF TABLES
Number
391
3.2
4.1
5.1
5.2
6.1
6.2
6.3
Title Page
Summary of Previous Dri 1·1 i ng -Watana ..... ~ . . . . . . . . . . 3·7
Summa~y of Previous Drilling-Devil Canyon •....•.... 3-8
'
Geologic Time Scale .... , ............................. . 4-3
Summary of Drilling Activity-1980 .................. 5-8
Summary cf Laboratory Testing ....................... ~ 5-9
~.Jatana Borehole Rock Quality Distribution .. -........... 6-17
..
Devil Canyon -Orientation'of Discontinuities ... _. .. ~. 6-18
Uevil Canyon-Borehole Rock Quality Distribution .... 6-19
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L1ST OF FIGURES
~-1
1.2
1.3
3.1
3.2
4 .. 1
4.2
5 ,1.
5.2
5.3
5.4
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
Title
Locati\'ln of Dam Sites
Watana: Location Exploration Map
Devil Canyon: Location Explot'ation Map
Watana: Location ~. I oration Map
Devil Canyon: Location Exploration Map
Regional ~eology
. Geologic Map of Devi 1 Can,yon Reservo#ir
Watana: Location Exploration Map
Devil Canyon: Location Exploration Map
Typical Instrumentation: Watana
Typical Lnstrumt:ntation: Devil Canyon
Watana: Location Exploration Map
Isopach Map of Overburden -Watana
Geologic Map of Watana
Geolog~c Cross Sections -Watana
Geologic Map of Devil Canyon Reservoir
Joint Stereo Plots -Watana
Watana Dam Site: Subsurface Temperature Measurements
Watana Dam Site: Subsurface Temperature Measurements
iv
Page
1-5
1-6
1-7
3-9
3-10
4-4
4-6
. 5-10
5-11
5-12
5-13
6-20
6-21
6-22
6-23'
6-24
6-25
6-·29
6-30
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LIST OF F!GURES (Cont!d)
Number
6.9
5.10
6.11
6 .. 12
6.13
6.14
Title
Watana Dam Site: Potential Borrow Areas
Oevi 1 Canyon: Lac at ion Exploration t4ap
Isopach Map of Overburden -Devil Canyon
Geologic Map of Devil Canyon
Geologic Cross Section -Devil Canyon
Jotnt Stereo Plots -Devil Canyon
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Page
6-31
6-32
6-33
6-34
6-35
6-36
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1 -INTRODUCTION
1.1 .. project Desc~~ptjon ana Location
The Susitna Hydroelectric project is locatt~d within the upper teaches of the
Susitn-a River basin in south-central Alaska. The current feasibi1ity studies
for a hydroelectric developnent are being p1erformed by Acres Jlmerican
·Incorporated (AAI) under contract to the Al i.1Ska Power Authority (APA).
The overall objectives of the study are:
.... To estab 1 ish technical, economic and financial feasib·i 1 ity of the Susitna
project to meet future power needs of the Railbelt Ragion of the State of
Alaska;
-To evaluate the environmental consequences of designing and constructing the
Susitna project;
-To file a completed license application with the Federal Energy Regulatory
Commission (FERC) should the project be deemed feasible ..
The Susitna River is a glacially-fed stream which r.~ads on the southern slope
the Alaska Range and flows southward through the Talkeetna Mountains, then
through a continuously widening valley to Cook Inlet. The area of study is
located within the Coastal Trough Province of south-central Alaska, with a
drainage of approximately 6,000 square miles. From its preglacial channel in
the Alaska Range, the Susitna river passes through a broad glaciated, inter-
montane valley of knob and kettle and braided channel topography. Swinging
westward along the edge of the Copper River lowlands, it enters the deep
V-shaped va11ey of the proposed dam sites winding through the Talkeetna
Mountains until it emerges back into the broad glacial vaJley leading to Cook
Inlet (Figur·e 1.1).
Geotechnical Investigations -Task 5 is an important element of this study. Al-
though the plan of study includes evaluation of the entire basin for potential
hydrodeveloJltlent by ev.aluating the relative meri-cs of several sites, the geo-
technical investigations were pl annecl for a two dam scheme. This scheme was
determined to be the optimum by previous inve~tigators including the U.S .. Army
Corps of Engineers (COE) and Water & Power Resources Service (WPRS) (formerly
the USBR) p 1 an. It inc 1 udes a 1 arge rockfi 11 dam ana underground powerhouse at
Watana and a relatively high concrete dam with underground powerhouse at the
Devil Canyon site (Figure 1.1).
The Devil Canyon site is located 14 miles upstream from the Goid Creek station
on the Alaskan Railroad approximately 140 miles north of Anchorage and 160 miles
south of Fairbanks. The site is located at approximately river mi 1 e 133 ..
The Watana site is located at approximately river mile 165 (30 river miles up..,
stream of Devil Canyon site). A transmission-line~ .approximately 365 miles
long, is planned to connect the proposed hydrodevelopment with the existing
power grids at Fairbanks and·,nnchorage.
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The Watana dam site is located in a relatively broad U-shapea valley rising in
steps~ wi.th the steep lower portion breaking into somewhat flatter slopes and
becoming much gentler near the top (Figurel.2). Access to the lower sections
is very limited due to vertical rock outcrops. However, there are same smal1"
gravel bars which can be quite wide at law water level. The proposed dam is lo-
cat,ed upstream of 'th-e Tsusena Creek confluence and downstreCJn of Deadman Creek.
The river at this site is w1der than at Oevi l Canyon, but the water is still
turbulent and ~~ift flowing.
At the Devil Canyon site, the river enters a very narrow gorge ~bout two miles
in length with near vertica.l walls up to 600 feet high. The dam site is located
several hundred feet downstream of the entrance of Devil Canyon (Figure 1.3).
The valley .;s generally as)ml!tetrical in shape, with the north. abutment sloping
at about 45• and the south a.butment steeper at about 60°. The south abutment
displays overhanging cliffs and detached blocks of rock, while the north abut-
ment is somewhat less rugged in the upper half but the lower portion is very
steep.
The Susitna River in Devi'l Canyon is very turbulent and approximately 100 feet
wide with very little beach. The canyon itself is appr·:,ximately 1,000 feet wide
at dam crest elevation.
1.2 -flan of Study
(a) Objectives
The objectives of the Task 5 studies are to determine the surface and sub-
surf'ace geology and g£!Otechnica1 condi.tions far the feasibi 1 ity of:
-A large rockfi11 dam, powerhouse (underground or surface) and .associated
structures at Watana site;
-
-A concrete dam or alternative stl"'UCture \vi th underground powerhouse and
as.soci ated structures at Devi 1 Canyon site;
,. Transmission lines to connect the proposed develoJlllent with the existing
power grid system and;
-Access roads to the pro·posed deve 1 opment.
In addition, the river canyon ·reach which would be flooded by the proposed
reservoirs will be studied to determine the potential areas of instability
and to identify the. major geological features that could affect the feas i-
bi 1 ity of the projects.
(b) Scoe.e
The task. was subdivided into a series of subtasks to meet the overa11
objectives. The subtasks and their corresponding objectives are:
1-2
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Subtask
5.01 ... Data Collection
and Review
5.02 -Photointerpretation
5.03 -Exploratory
Program
: Design (1980)
5. 04 -Exp lot atory
Program (19BO)
5.05 -Exploratory
Program
Design (1981)
5.06 -E.xp loration
Program (1981}
A1 • • < '1'".,. ... • ••
Objectives
To collact and review all existing
geologi~al and geotechnical data
pertaining to the Susitna project
includin.g the access road and trans-
mission line corridors and the upper
Susitna River basin
-Perform air photointerpretation and
terrain analysis o.f the Watana and
Devi 1 Canyon dam site areas, reser-
voir areas, construction material
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borrow areas and access road and ··--· transmission line corridors, and _
identify adverse geological features
and geotechnical conditions that I
could significantly affect the design · .
and construction of oroject features
-Design the geotechnical exploratory
investiga~ion programs for 19~0 for
Watana and Devil Canyon dam sites,
dam construction materials, and res-
ervoir areas, and along the access
road route
.. Perfonn initial surface and subsur-
face investigations at Watana and
Devil Canyon sites and reservoir
areas and access road routes to es-
tablish gener.a1 and specific geologi...:
cal and foundation conditions
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I -Design the geotechnical exploratory
investigation programs for 1981 far
Watana and Devi 1 Canyon dam sites, I
dam construction materials and reser-·
1-3
voir areas, and for the selected ac-
cess road and transmission line
routes I
., Complete surface and subsurface 1
in'lestigations at Watana and Oevi 1 ?'
Canyon dan sites, reservoir areas,
acce:ss. roads and transmission line
routes to extent necessary to provide
adequate data to conf.i rm project
feasibility und for submission of .
FERC 1 icense application
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5.07 -Exploratory
Progr,am
Des·ign
(1982-1984}
•
5.08.-Data Compilation
(c) ~pproach
-Design of the geotechnical Program
exploratory investi~at ions program
for 1982 to 1984 to obtain basic
design data for Watana dam site, dam
construction materials and reservoir
area, and for the selected access
road and transmission line routes
-Assemble all geotechnical exploratory
data into documents suitable for in-
clusion in relevant projact reports·
and 1 i censi ng documentation.
To meet the objectives of the task in an orderly and timely manner, the
geotechnical exploratory programs are divided into three stages, i.e. the
1980 activities, 1981 activities and the activities auring and· after 1~82
·(after the FERC license: app1 ication is submitted). The 1980 geotechnical
activities were p 1 an ned to identify and investigate in 1 imi ted deta i 1 those
geological and geotechnical conditions which have been identified by
previous investigators and which could significantly .affect the feasibility
of the project. The actual fi~ld investigations• scope was, therefore,
limited in nature. These activities incluaea Subtasks 5.01 through 5.04.
The results of these subtasks are presented in this report.
Subtasks 5.05 through 5.07 are to be undertaken during 1981 and \.arly 1982.
·Under these activities~ a more detailed study will be made of those
geological and geotechnical conditions identified during 1980 studies.
Also, the explorations for the access roads and the transmission lines will
be undertaken under these subtasks.
It should be noted that the results presented in this report are
preliminary and c1re subject to revision depending on the results of future
investigations,. In particular; the geologic history of this region is very
complex and has not been studied in sufficient detail. The conclusions
drawn are very general and are intended to be used for work of a
preliminary layout and engineering feasibility nature. A more complete
evaluation will be developed after the completion of Subtasks 5.05 through s.os.
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. . . - -·-;-- - - - - - - - - - - -•. :--
SCALE:
0 tO 20
Mll£1
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,.-r--J _,_,
LOCATION OF DAMSITES
l£GEHO ..
TVONE A
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REF. U.S. ARMY CCrtPS OF ENGINEERS
SU?PLE!.!EUTAL FEASIBILITY
REPORT 1979.
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LEGEND
TEST PlT -.
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•AP
•OH
•OR
•BH
•AH
AUGER HOLE I CORP OF ENGINEERS 19-{8
CORE DRILL HOLE J ' '
ROTARY DRILL HOLE ' '
BOREHOLE J
· .· SU~JMER 1980 PROGRAM AUGER HOLE
~fo ----tot SEISMIC LIN~:
DM, SW-CORP OF ENGINEERS. 1978
SL -SUMMER !980 PROGRAM
; 1 CROSS SECTIONS
<;!WJ lOCATION OF JOINT MEASUREMENTS
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WATANA LOCATION -EXPLORATION ~ .. 1AP
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NOTE:
AP!7 •
I) SECTION StimVN ON AGURE 6.4
2} TO?OGFU\Patc CONTOURS ARE
APPROXlMATE
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~ ~--------------~--·---
fl£FEREHC£: USGS, TAf.J<EE::TNA MOI.Nr~ (.O•Sl, ALASKA OW.OAAN:;t.E,
SC:W!IRD J.!ERIOIAN.: T32 N. RlE, S32 .AN:> 33.
r-'~. ----------------====----
DEVIL CAf\lYON LOCATION EXPLORATION MAP
LEGEND ~ • DH BOREHQI-ES-BUREAU OF RECl.AMAtlC~,.:o4
1960 ii
• BH . SO .. RE. HOLES .. -SU. M .. N·. ~ ER.· tSSO .. · . P. ROGRA .. ·r..~ ., .•. • "f?.S, TEST PiTS AND TRENCHES
. BUREAU OF RECLA~ATlON, 1960
{;) AUGER HOl..ES-SUt.t\EttiSSO PROG:-~~
SW SEISMIC LINES-f 1 CORP OF ENGINEE.~S:t 1978 t
SL SEISMIC LINE$... t
. . I . I SUMMER 1960 PRQ...;~AM I
. . . ·.·· ·;V .. ·· .. ~. . ~· . · .... · . · ··.e OCJ LOC.·. AT ION. OF.· JOlN't ~~EASUR.EMENT ~ . ,.;/~ · . . . t .f CROSS SECTION, . ~
)~.
~~-~
NOTE:
TOPOGRAPt-G: c~ AF.::
APPROXIMATE
SECTION SHOW~ ON FIGURE 6.1~
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~ llWMt. &); F-:."
DA$~e:o t:oNTOOR a .~
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2 -SUMMARY AND CONCLUSIONS
2.1 -Introduction
The summary and conclusions presented herein are based on a review of previous
investigations complet.I;d by other agencies and the data developed by AAI during
1980. ~. It is emphasized that the conclusions presented are subject to revisions
following further studies to be performed in 1981.
2.2 ... Watana Site
( a) Surmrary
Based on a review of pre.vi.ous studies and the work performed during 1980,
tJte following technical conditjons have been identified regarding the
Watana dam site:
(i) The dam site is underlain principally by a diorite intrusive ~ocx
which is overlain by an extrusive ander,itic rock expo.sed downstream
of the proposed dam axis.
( i i) Bedrock qua 1 ity is genera 11 y good to exce 11 ent be.l t~w thfl upper 10-40
foot weathered zone ..
(iii) Two prominent .shear zones~ "The Finsu and ''Fingerbusteru are exposed
on the right abutment upstrean and downstream of the proposed dam
axis~ respectively. Lack of bedrock exposure precludes the mapping
.of' these features on the left abutment.
(iv) ~eologic mapping infers the continuation of .. The Fins" in a
northwesterly direction, outcropping along Tsusena Creek north of
the site ..
( v) Localized shear and fractured zones were encountered in ~everal of
the bor"ings.. These zones ranged from 1 to 5 feet in thickness.
( iv) Tile contact between the extrusive andes.ite and the diorite was
dri 11 ed in two of the 1980 borings. The nature of this cont.act is
not clearly defined but believed to be relatively shallow with a
decrease in rock quality and weathering at the contact.
(vii) No clear evidence of faulting in the river channel was found ..
(viii) Overburden thickness is generally thin . a long the v a 11 ey and thi ck~ns
to the north away fr.om the dam site. Overburden generally con·sists
of glacially derived silts, sands; gravels, boulders and lat.:ustrine
clays ..
(ix) Depth of river alluvium beneath the dam averages approximately 60
feet and consists of sand~. silt, coarse gl"avels and boulders ..
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(x) Several localized areas of deeper overburden were encountered on
both cmutments.. Further studies are required to more -accurately
'de 1 i neate these areas.
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(xi). A possible ralic channel ittentifie~ in previous studies and recon-.. J 1
(xii)
(xiv)
f·irmed in the 1980 program extends from approximately 9.,000 feet up-
stream of the dam in a general northwesterly direction towards
Tsusena Creek. The depth of this chann,e 1 extends 500 feet bel ow
ground surface. Further study is required to delineate the full ex ..
tent of this channe 1 .
The lar·gest geologic tectonic feature mapped irt the vicir.i"ty of the
dam is the Talk~etna thrust fault approximately 4 miles; from the dam
site. No ~videnc~~ of recent fault mo,Jement nas been found, however.,
f?urther investigation of this feature is planned for 1981. The
f~ult crosses the Susitna River approximately seven miles upstream
of the dam site ..
Permafrost conditions exist on the left abutment. Although the
depth of the permafrost has not accurately been determined~ measure-
ments indicate that it penetrates to a depth of at least 200 feet.
The ground temperatures are believed to be within one degree centi•
grade of freezing !)and therefore are relatively marginal. Further
work to delineate the extr---of permafrost will be performed during
1981. ·Only sporadic penh; v'rost was encountered on the ri ghf abut-
ment. ·
Reconnaissance survey of the Watana reser •air shows that several ·
areas along Watana Creek and other small· r tributaries contain thick
deposits of glacially derived materia 1.
(xv) .Suitable quantities of rock fill and soil borrow materials have been
found within the daqJ area for construction.
(b) Conclusions -·;~ . ......_--..~-
Based tn these findings, the fol10~'ing tentative conclusions regarding the
Watana site can be made.:
-
(i) The site is geologically and geotachnica11y feas.ible for the cons-
truction of a rock fi 11 d<Jn and associated structures ..
( i i J The general rock conditions are considered favorable for. an under·
ground powerhouse provided no large shear zones similar to the
"Fingerbuster" are located on the 1eft abutment. Nominal support
·>may be required for ger;eral rock conditions. -
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(v)
(vi) ·
and ·weathered rock and perform~ce of conso1 idation .and curtain
grouting with the use of drain holes and drainage galleries in the
abutment and upstre·tml of the underground structures.
A 1 though the relict cha'/lf1A 1 on the north abutment warrents further
study" it is nat anticip. .. ·:,:!1 to have any major impact on the feasi-
bility of the projecto · Conventional engineering methods ta prevent
seepage and associated phenomenon such· as piping, will t~ investi~
gated during 198.1. :and in subsequent stud~es ..
Local s 1 •Jn1pi ng and 1 ands 1 ides may .occur in the ·reservoir during
filling and 01peration in areas of thick, steeply dipping unconsoli-
dated soil ·as well as along portions ~f the narthfacing slopes where
permafrost exists ..
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2 .. 3 -Devil Canyon. SitE!_
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I · (a) Summar,1
(b)
Bas~d on a review of previous studies and the work per·formed during 1980,
the. following· summary of site conditions at the' Devil Canyon site can be
made: •
1': .. 1\
(i) · The proposed dam site is underlain by a homogeneous argillite ana
graywacke rock. The ro~~k is generally of good ·t\:> excellent quality.
Overburden in the valley is thin to non""'existant. :1 1
(ii.) . The rock has one major and possibly two minor joint sets.. The maj.or
set strikes approximately 340 9 and dips 85° NE. Bedding strikes .•. ,
subparallel to the gorge (50 ... 70°) and dips steeply (50"-80°) to the
southeast.
(iii) Stress relief and open joints, both paralleling to the gorge and I i!
along th~ major joint sets~ extend up to 40-60 feet back from the
cliff edge; J :
{iv) Earlier investigators had postulated the possibility of a geologic
fault on the. 1 eft abutment approximately under the series of 1 akes. ,.1 .. _.
The seisrnit; ref:· ··.:tion survey has indicated an anomalous velocity
· zone;-however,, the boring ( SH-4) did 11ot encounter this featur\.. ..
If the boring missed the feature; then it can be postulated that the J · ·
sheF.tr zane, if it exi'sts~ wi1l be dipping along the bedding rather ; :
-( v)
than acrass it. Additional investigations are planned to further '" ..
investigate this feature. · I:
The possibility of a fault was postulated by earlier investigators
a long the river charmel under the proposed dam.. This feature wi 11
(vi)
be explored during th-e 1981 investigations.
A sever a 1 hundr~ foot step in bedrock surface had been reported by
earlier investigators upstream of the propose\d dam site, under the
alluvial fan where Cheecliako Creek joins the Susitna River. The
location of this feature is 1~000 feet upstream of the dam site.
(vii) . The shear zones postulated by the_ WPRS to exist subparallel and
subperpendicular to the river could not be verified during the 1980
program. Additional work relative to these features wil1 be carried
out in 1981.
(viii) No extensive permafro~t ""flnd·itions were found to exist on either
abutment.
Conclusions .. ,...._
Based on the above~ the following tentative conc·1usions have. been made ·
regardin"g the Devil Canyon site:
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(i) The site appears geologically and gaotechnically feasible for the
construction of either a rockfi 11, concrete g~avity, or arch darr.
( i. i) Further detailed geologic studies are required to determine the
suitability of the bedrock for construction of large underground
power facilities.
(iii) Further inve""tigations are .r·equired to define the potential·
existence of a fault under the dam along the river channel and a
f au 1 t on· the 1 eft abutment.
(iv) The foundation treatment will require grouting and provisions fov-
drainage adits and dram holes for the dam .. Extensive dental
concrete may be required to treat local areas for concrete dam
foundations particularly on the left abutment.
(v) Suffici·i.~f~t quantities af construction material have been identified
for the concrete· aggregate and the construction of the saddle dam on
the left abutment.
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3 -REVIEW OF PREVIOUS INV£STIGATIONS
3~1 -Introduction
The development of the Susitna Hydroelectric Project has been studied by several
Federal and private agencies in the last 30 years. However, it was not until
the late 1950:'s that any geotechnical investigations \t~ere conducteo.
Between June 1957 and August 1958~ WPRS performed geologic mapping and drilling
investigations at the Devil Canyon site and limit~d geologic mapping at the
Watana. site (19). ·
Subsequently during the 1970's, the COE perfonned adaitional investigations on
bath sites. These included seismic refraction surveys, detailed geologic
mapping and diamond and auger dri 11 ing in the dam sites and potential borrow
areas.
This report briefly discusses the findings of these investigations as documented
by the WPRS and the COE. These reports are identified as appendices of this
summary and are available with APA and AAI for reference. These are not includ-
ed at this time.·
3,.2 -Watana ---
The preliminary work by the WPRS in the 1950's was expanded during the 197G's by
the COE investigations of the dan site~ reservoir, and potential borrow areas.
The location and extent of these investigations are shown an Figure 3 .1.
,
In 1975~ a total of 22,500 ltnear feet of sei smi<: refraction survey was perform-~
ed by Oames & Moore (6) for the COE. This was expanded by Shannon & Wilson (14)
in 1978 with an additional 47,665 feet of survey. This work. served to support
the results of the dri 11 ing and mapping programs.
P.lso during the 1978 season, the site was explored with 28 diarnnd drill holes
(both vertical and inclined) ranging from 30 to 600 feet deep. A summary of
this program is presented in Table 3.1. Six of these diamond drill borings were
located in the river valley and reached a maximum depth of 52{) feet into rock.
Five borings were dr~11ed on the left abutment and six on the right reaching a·
maximum depth of 300 feet or an elevation of 1,6b0 feet. On the right ab"Utment,
eleven diamond drill borings were located in what was identified as a deep
relict channel to determine the thickness and characteristics of the overburden,
the depth o·f the water table and the permafrost conditions .. .
Four potenti·ll borrow; areas for cQnstruc'tion material were identified and ex-
plored using 26 backhoe test·· p1ts-and 24 auger· borings. Fourteen test pits were
located in Borrow Area 0 on the right abutment which· was identifi~d as a source
of· imperv·ious and semi-pervious materi.al for the embankment. Six test pits were
located in Borro\.1 Area E identified as a potential source of filter material and
concrete aggregate. This area is situated at the confluence of Tsusena Creek
and the Susitna River, approximately 15,000 feet downstream of the dam site.
Six test pits were located in Borrow Area F on Tsusena Creek, three mi 1 es up--
stream of its confluence with the Susitna River, as· a potential source of sandy
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materials. Yhe 24 shall ow auger borings were dri 11 ed in Borrow Area D between
Tsusena and Deadman Creeks and ranged from 3 to 59 feet deep.
Detailed geologic mapping was conducted in the dam site area to delineate major
structural trends.
Two potential quarry areas were identified and reconnaissance exploration was
conducted. Quarry A, was located on the upper part of the left abutment and
Quarry B, on the right abutment relatively close to the river~ Both areas were
mapped as a diorite that would require minimal crushing &nd sorting for uss in
construction ..
A limited laboy-atory testing program was conducted on potential filter, core ana
embankment mat~roi als from the various borrow areas to establish the index and
engineering characteristics of the borrow materials. These tests included grad-
ation curves, permeability, triaxial shear tests, Modified Proctor density "~est.s
and concrete aggregate tests.
The COE also installed a series ~f ten open well piezometers ana thirteen temp-
erature logging devices in the boreholes. These instruments had not stabilized
by the end of the COE investigation and, therefore, no definite· conclusions \"fer~
drawn. ·
3. 3 -· Devil Canyon
The investigations conducted at the Devil Canyon site were not as extensive as
those at Watana.. The exploration plan is shown on Figure 3.2 and summarized in
Table 3.2
The WPRS performed the bulk of exploration at this site between June 1957 and
August 1958 {19). Twenty-one diamond drill borings were drilled in the d~ site
area. Six holes, from 50 to 110 feet deep, were located in the left abutment
within the pr·oposed switchyard area down~tream of the proposed saddle dam axis.
At the deepest point~ rock was encountered at 87 feet below the surface in what
was interpreted as an old bur.ier.i channelo Three holes were drilled upstre.am of
this area with a maximum depth of 120 f~et.. The remaining twelve holes were
drilled along the riverbed near the dam axis to determine t~e depth and nature
of the bedrock under the dam.. One other proposed borehole wa.~ subsequently
trenched as a test pit.
Ninsteen test
the dam axis.
gate materia 1
dam abutments
pits were dug ln the alluvial fan near Cheechako Creek upstream of
This area was considered to be the only source of concrete aggre-
for dam construction. Four additional trenches were dug on the
to define the rock conditions present •
Laboratory tests~ including gradation determinations and petrogt•aphic analysis
were conducted on samples of, the borrow area materials to determine their suit a-
. bil·ity for use as concrete aggregate .. ''Representative rock samples from the
abutments were tested to determine comp·.nessive strength, elasticity, obsorption,
and porosity of the foundation materi a1 .. ·
During 1~78, Shannon & Hilson (14), under COE contract, ran three seismic te,.
fraction· lines totaling 3,300 feet in the borrow area and along the proposed
saddle dam to expand the drilling information. ·
3-2
3.4 -Conclusions ·
The investigations conducted by the COE and WPRS were the first detailed
efforts, although limited in nature, in establishing the feasibility of the pro-
jects.. The l'eview of these investigations served as the basis for-identifying,
those· geological and geotechnical features that wer.e considered to require
further investigation,. A brief summary of those features. ana findings of those
investigations is presented as follows.
(a) Watana Site
The Watana site was considered sui tab 1e for a large rockfi 11 dam, an under-
ground powerhouse and ancillary structures. However, before the feasibil-
ity is conc1ustve1y established, certain featur·~~~s must be further investi·
gated.
(i)
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( i i)
The overburden in the river was composed of 40 to 80 feet of rela-
tively loose alluvial gravels, cobbles and boulders. The stability
of this alluviur.t was questioned under the seismic loading conditions
being considered for the project. ··
The underlying rock at the dam site was a diorite intrusion with I
local andesite dikes. The overall rc1ck was found to be ha\"d and
fresh with the fract~res becomin·g tighter with depth. Shear zones ··•
were observed both in outcrops and the dr·i11 cores but were not con-
sidered to be significant4
(iii) The rock in the right abutment was found to be more weathered than
. the rest of the dam foundation averaging to 40 feet below the bed-
rock s:Arf ace ,
(iv) The ..-ock along the left abutment was also identified as diorite;
however, in a downstream boring, a surface flow of andesite porp:1ory
was encountered.. The re1 ationship of these two rock typ.es was net
delineated and it was recognized that this would require resolution
befora design of underground structures could be undertaken.
(v) North of the right abutment, a deep bedrock depression filled with
glacial material was encountered in the boring and seismic refrac-
tion prog~ams .. Glacial tills oc~ur in this area in three major sa-
quences separated by 1 ayers of sandy gravel alluvial material and
two major l.ake deposits of p 1 asti c c 1 ays. The 1 owest bedrock sur-
face' encountered in the drilling wa!; 454 feet be.low the surface
{elevation 1,775). This compared with current riverbed rock eleva-
tion of 1,395+·feet~ -
(vi) Two prominent shear zones named "Fins 11 and uFingerbusteru were map-
ped as exposures in the dam site area. Both of these zones trend
northwest with, str~kes from N4o·w to N60.,W and dips to 70° to 90° SW
to NE. "The Finsu, 3,t:.OO feet upstraam of the dam, had an observ-
able width in ~xcess of 400 feet with fins of 5 to .25 feet wide and
bounded by severely altered zones. The "Fingerbustern, 2,500 feet "
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)
(b)
downstream of the axis~ was less well defined with rock fac~s
paralleling the shear zane.
(v·\i) The seismic refraction survey indicated a low velocity zone along
the right abutment that could be interpreted as a possible s1 ide
block and identified for further· investigation.
(viii) The foundation rock ~t t:-;~ site was considered of generally good
quality with relatively ~4igh intact strength,. Rock bolts and shot-
crete in the underground exc av at ian were considered to provide
support.
( ix) Ade.quate construction material was identified near the dam site.
Material from Borrow Area D on the right abutment was c 1 assi fi ed as
sem~-pervious to impervious core material. The tests indicated that
this material is sensitive to variations in water content and looses
strength rapidly with increasing water content. Material from the
all uvi a1 deposit downstream of the dam axis (Borrow Area E) was .
identified as the most likely source of clean aggregate. Processing
was considered necessary for all materials ..
( x) Two patenti a 1 quarry areas were identified for sources of rockfi 11,
ri prap and coarse filter materials. The rock. in both areas was
classified as dior·ite and of good quality. Further mapping was con-
sidered necessary to verify the suitability.
{xi) Per :~jafrqst was found to be very deep on the 1 eft abutment ot north
facing slope~ while somewhat sporadic on the right abutment, Pre-
liminary temperature readings indicated that the permafrost \s rela-
tively warm within -l"C to o•c and could be easily handled during
construction. However, these instruments had not stabilized by the
end of the COE investigations and further readings will be neces-
sary.
Devil Canyon Site
The investigations conducted to date ipdicate that the Devil Canyon site
would be a feasible location for a high concrete dam, preferably a thin
.. arch dam, with an unde~ground powerhouse. However, certain specific feat-
ures were identified for further study before the feasibility of concrete
structures could be positively established .
(i) The bedrock at the proposed dam .site was classified as a thinly
bedded, fine grai-ned. phyllite. The strike of the bedding was found
to be generally east-west paralleling the river and dipping 65° to
75° to the south. ·The drilling indicated that weathering extends
some 40 feet below the rock surface with penetrative weathering
restricted to shallow zones along the joints. The rock overall was
found to be of good quality.. One master joint set was identified
striking N25°W and dipping. 80°E, wi·''h general spacing of 5 feet.
3-4
(ii)
(iii)
{iv)
( v)
(vi)
(vii)
·(viii)
(ix)
(x)
The valley walls at the dam site ~re very steep and were found to
(Ja~e only a thin cover of overburden consisting mainly of talus at
the base. On the upland areas, a covering of glacial ti 11 increased
to 5 to 35 feet thick.
On the left abutment, a series of smalT lakes were found to exist
approximately parallel to ~he river channel. Deep overburden, up to
800 feet in thickness was encountered in this area. Further, it was
stated that possibly a large shear zone or a fault existed a 1 ong
these -1 akes.
-A number of shear zone3 were encountered during the investigations
both subparallel and subperpendicular to the river channel. It was
considered that these shear zones could have an important effect on
the design and required further investigation. The zones could have
been either local stress relief features ir part of more general
subregional shear pattern.
It· was suspected that possibly a fault or major shear zone may exist
under the current river channel; although, no positive evidence was
presented.
The rock conditions were considered aoequate for underground excava-
tion. Normal rock support systems such as shotcrete were considered
to provide adequate support except at the portals and within zones
of very poor quality rock. Further investigation was considered
necessary to de.fine the conditions present far the mast advantageous
alignment of the structures.
A 1 arge fan area near Cheechako Creek7 immediately upstream of the ·
proposed dam site, was explored for the availability of mater1als
for concrete aggregate and the sa~dle dam construction. The explor-
ation in this area also indicated the possible existence of a step
in the bedrock surface from 100 to 350 feet below the ground surface
within a short distance. The st~p was also coincident with a sharp
bend in the river course.
The material within this alluvial fan was found to be sui tab 1e for
concrete aggregate except for a deficiency of 3/4 to 1-1/2 inch size
that cou 1 d come from 1 oca 1 morai na 1· materia 1. Laboratory tests con-
ducted on the collected samples canfirmed their general suitability
provided proper processing was employedo However, the resistance of
the material to effects of the cold weather was not propet-:y eval-
uated.
Permafrost W4S encountered as sporadic and shallow. Thin l.t:flses and
pockets were encountered during road construction on the left abut·
ment. It was considered doubtful that permafrost would be a prob-
lem.
lt was concluded that grouting and drainage under the structure and
in the abutments wi 11 be required. Foundation preparations were to
include approximately 40 feet of rock excavation to achieve sound
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· rock, and consolidation grouting and dental concrete work to treat
local shear zones and poor rock conditions .
It was concluded by both agencies that additional detai1ed investigations were
required to better define the subsurface conditions, to evaluate the extend and
characteristics of geological features, and to supplement the preliminary
conclusions in order to establish positively and conclusively the feasibility of
this project.
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Drill Hole
Number
OH-1
DH-2
DH-3
DH-4
DH-5
DH""6
DH-7
DH-8
DH-9
DH-10
DH-11
DH-12
DH-13
OH-14
DH-15
DH-16
DH-17
DH-18
DH-19
DH-20
DH-21
DH-22
DH-23
DH-24
DH-25
QH .. 26
DH-27
DH-28
TABLE 3 .. 1
SUMMAR'! OF PREVIOUS DRILLING
WATANA DAM SITE
_,..,. wauw::s;:; -
'' Depth of Boring, ft.
Location (Overburden) -
~;ve.r Valley 122.8 (44}
River Valley 29 (29)
River Valley 174.5 (77 .. 6)
River Valley 122 0 9 ( 77 • 7)
River· V a 11 ey 176 .. 9 (59 .. 6)
Right Abutment 149.5 ( 3.5)
Right Abutment 122 .. 2 ( 8 .. 5)
Right Abutment 150.0 \16.2}
Riqht Abutment
"" 293.3 ( 5 .. 6)
Right Abutment 203,.5 (19.6)
Right Abutment 300 .. 0 (22 .. 7)
Left Abutment 301~1 ( 9 .. 5)
Re 1 i ct Channe 1 84 (84)
Relict Channel 75 (75)
Re 1 i ct Channe 1 316.5 (286)
Left Abutment 91.5 ( 67)
Left Abutment 35 .. 7 ( 9~0)
Left Abutment 248 .. 3 (231 .. 0) n
Relict Channe 1 78.3 (55)
· Intake Structure 252.6 (210)
River Valley 603.7' (84.5}
Relict Channel 493.6 (454)
Left Abutment 119 .. 2 ( 7 .0)
Left Abutment 139.9 ( 6.9)
Left Abutment 79.9 ( 79.9)
Re 1 i ct Channel 94.8 ( 94 .. 8)
Ral i ct Channe 1 44 .. 0 ( 44)
Left Abutment 125.2 ( 9.2)
3-7
Angle
W/Vertical Orientation
Vertical --· Vertical --Vertical --Vertical --Vertical --Vertical --31° S30°W
Vertical --45° N43CiW
Vertical --
45° N32oE
Verti.cal
Vertical --Vertical
Vertical --Vertical
Vertical _,_
Vertical
Vertical --Vertical --31.4° N4CE
Vertical --45. S30°\~
Vertical --46° N47eE
Vertical --Vertical --Vertical --
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-Dri.ll Ho 1 e
Number
DH•l
DH-3
DH-4
DH-5
DH-6
DH-7
DH-8
OH-9
DH-10
OH-11
DH-llA
DH-118
DH-11C
DH-12
DH•l2A
DH-.13
DH-13A
0Haol4
DH-l4A
DH-148
DH-14C
DH-15
TABLE 3.2
SUMMARY -QF PREVIOUS DRILL1N\l
DEV!L eANYON DAM SITE
Depth of Boring, ft ..
Location (OVerburden)
Left Abutment 117.3 ( 0)
Left Abutment (Hole Trenched)
Left Abutment 52.5 (25)
Left Abutment· 86.2. (55}
Left Abutment 107.3 (87)
Left Abutment 59.5 (34)
Left Abutment -150.4 ( O)
Left Abutment 87.0 ( 0)
Left Abutment 121.7 (15)
Left Abutment 30.5 ( 0)
Left Abutment 29.1 ( 0)
Left Abutment 33.9 ( 0)
Left Abutment 150.1 ( 0)
Left Abutment 127.5 ( 0)
Left Abutment 149.3 ( O).
Right Abutment 137.0 ( 0}
Right Abutment 80.7 ( O)
Right Abutment 50.0 ( 0)
Right Abutment 130.4 ( O)
Right Abutment 146.2 ( 0)
Right Abutment 82.0 ( O)
R~ght Abutment 47.6 (48)
3-8
Angie
W/Vertical Orientation
45~ S23q E.
Vertical
Vertical --\lerti ca 1
Vertical ·--Vertical ·--
60° N9"W
45° Due North
38° N65•E
48° N5°\~
45 4 N5°W
39° N5°W
33° N5°W
30° N45°E
45° N45•E
45° Sl8°E
37° Sl8°E
45° S4s·w 37. S4s·w
60° S4s·w
35° S4•E
Vertical --
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REF. U~S. ARMY CORPS OF ENGlNE:ERS
SUP?LEMENTAL FEASISIUTY.
REPORT 1979. .
. 3-9
t
•TP
•AP
•DH
•DR
•BH
ttAH
LEGEND
TEST PIT -j
A:JGER HOLE
CORE DRILL HOLE CORP OF ENGINEERS, 1978
ROTARY DRILL HOLE .
130R~HOLE J SUMMER 1980 PROGRAM
AUGER HOLE
&---·-4 SEISMIC LINE :
D~, SW -CORP OF ENGINEERS. 191'6
. ~-SUMMER 1980 PROGRAM
f.
E:.a CROSS SECTIONS
~WJ LOCATION OF JOINT MEASUREMENTS
BORROW AREA F
QUARRY
SOURCE A
0
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I.
·~
0
APi7 •
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NOTE: ~
I) SECTION SH~"N ON AGURE: 6 4 ~
2) TOPOORA?i-U~ tl:lNTOURS ARE. l•
APPROXU!.Att I
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~i USGS. TALKEETNA MOIJJTANS (0•5), Al.ASJ(A Ol.IAI>!WG...E.
5Ew:.RD lo!ERlO!.AN~ T:2N. RIE, S32 AHJ 33.
3-10 DEVIL CANYON LOCATION EXPLORATION MAP
LEGEND
• DH BOREHOLES-BUREAU Cf=" t\c:..l-., .. -•• ~ ....
1950
• BH BOREHOLES-SUMMER lSSO PR~:>U:;~\'•
t • TP.S, TEST PITS ANO TRENCHES l BUREAU OF RECLAMATiON~ ISSO
e AUGER HOLE.S-SUMMSR tSSO PR:J:;!~
. SW SEISMIC Ut>.'S.S-i---'~ CORP OF EN~tNEERS. 1978
--... ·.--,
SL SEISMIC UNES-
1 ··-1 SUMMER J9SO PROGRAM
e OCJ LOCATION OF JOINT MEASt:m:~~N t j-CROSS SECltON
NOTE:
TOPO~:c CONTOlP.S A.l:E.
APP'.dOXIMAl£
'SECTION S..'iOWN ON FIGURE 6 l3
St.I.I.E Ill FEtT
~ ~ !iP F'E:!;;'t
bl.sHED c::amHi "25 fEET
-__..,. .. ' "" ·-~---:------------,--------;--.------------;-.-~ ... -.-. ----~,--------,--,--~ .... ~---. ----------,----------;---,..-~. -------. ~. -~-~-,..---------,__,.,.. ____ -~--~--.
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4 -REGIONAL GEOLOGY
4 .. 1 -General
rhe geology of the Talkeetna Mountains and the adjacent Susit.na River basin is
extremely complex due to several periods of intense folding and faulting, in-
trusion-of volcanics and plutons!t regional metamorphism, differential uplift and
repeated glaciations (Figure 4.1). The following is a brief summary of the
geologic setting o.f the region. A detailed discussion of the regional geology
has been compiled by Woodward-Clyde Consultants (21) ~
4.2 -Geologic Setting
The oldest rocks which outcrop in the area are an upper .Paleozoic (Table 4.1)
metavolcanic rock sequence consisting of coarse to fine grained clastic flows
and tuffs of basaltic to andesitic composition, locally containing limestone.~
interbeds (2). This old volcanic systen is expos·ed as a continuous northe~~t-"
ward trending belt across the eastern part of the Susitna River basin, with
Triassic and Jurassic volcanic, intrusive and sedimentary rocks unconformably
overlying (Figure 4.1). These rocks consist of a shallow marine sequence of
metabasalt flows. These flows are interbedded with chert, argillite!t marble and
volcaniclastic rocks· and are best exposed in the Portage and Watana Creeks area
(Figure 4.2). The rocks .of Jurassic age include amphibolites, greenschists,
diorites and granod·iorites of the intruding batholithic complexes of the
Talkeetna Mounta.ins (2). The uplift and subsequent rapid erosion associated
with these plutonic rocks was followed by the marine deposition of a turbidite
sequence of 1 ower Cretaceous argi 11 i tes a·nd 1 i th i c gr aywackes ( 4) . These rocks
were subsequently faulted and compressed into tight isoclinal folds and sub-
jected to low grade metamorphism during the late Cretaceous. This sequence of
rock outcrops · in the Dev i 1 Canyon area.
During the early Tertiary, the country rocks were again intruded by Paleocene
plutons comprised of biotite granodiorite and other small granitic bodies.. Con-
current with and following these intrusions, a thick sequence·of felsic to mafic
volcanics and shallow intrusives of Palecoene to Miocen~ age were deposited~
4.3 • Regional Structur~
At least three major periods of deformation are recognized for the project area
( 4):
- a period of intense metamorphism, plutonism~ ana uplifting in the Jurassic;
-an orogeny during the middle to late Cretaceous;
- a period of extensive uplift and denudation in the middle Tertiary to Quater-
n_ary.
The first period,, which was during tne early to middle Jurassic, involved the
first major orogenic event in the now existing Susitna basin. It was character-
ized by the intrusion of plutons and accompanied by crustal uplift and regional
4-1
metamorphism; The rapid erosional period foliowing this uplift was accompanied
by marine deposition within the narrowing Cretaceous basin.
This period was followed by complex faulting and folding of the rocks during ·the
middle to 1 ate Cretaceous that produced a pronounced northeast-southwest
structural grain across the region (4, 5, 8, 9~ 13). The majority of the
structural features in the Talkeetna Mountains are a consef:luence of this orogeny
of which the Talkeetna. Thrust fault is the most dominant. The Talkeetna Thrust
which is postulated as representing an o.ld suture zone~ involves the thrusting
of Pa1eozic, Triassic J.nd Jurassic rocks over the Cretaceous sedimentary rocks.
{ 4~ 5, 8). Other compressional struc.tures related to this orogeny are evidenced
in the intense shear zones roughly parallel to and southeast of the Talkeetn.a
Thrust.
The third major series of events shaping the region involved a period of
extensive uplift and denudation from the midcile Tertiary to Quatet,nary (4}. Two
dominant tectonic features of this period bracket the basin area. The Denali
fault, a rignt-lateral strike-slip fault 25 miles north of the Susitna River,
exhibits evidence of f~ultu.9J$p.la_cement during Canomic-tims-.aP~--the Castle
Mountain-Caribou-fau~lt system, which borders the Talkeetna Mountains to the
south approximately 70 miles southeast of the sites is a normal fault which has
had fault displacement during the Holocene (7).
4.4 -Glacial Historx
A period of cyclic climatic cooling during the Quaternary resulted in repeated
glaciation cf southern Alaska. Little information is available regarding the
glacial history in the upper Susitna River basin. Unlike the north side of the
Alaska Range which is characterized by alpine-type glaciation, the Susitna basin
experienced coalescing glaciers from both the Alaska Range and the Talkeetna
Mountains tryat merged and filled the upper basin area.
At least three periods of glaciation have been delineated for the region based
on the glacial stratigraphy (11, 12). During the most rec~nt period, (late
t~isconsin glaciation) glaciers filled the adjoining lowland basin$ and spread
onto the continental shelf (11). Waning of the ice masses from the Alaska Range
and Talkeetna Mountains formed ice barriers which blocked the drainage of ·
glacial meltwater and produced preglacial lakes. As a consequence of thi·s
repeated glaciation, the Susitna and Capper Rive\' basi~s are coverea by varying
thicknesses of lodgement and ablation tills and 1\~custrine. deposits.
' ;~
i
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I
.... 1
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·--ll.
IJ.
ll .u.
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ERA
Cenozoic
Mesozoic
Paleozoic
I .Precambrian
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•••
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PERIOD
Quaternary
Tertiary
Cretaceous
Jurassic
Triassic
Permian
Pennsylvanian
Mississippi an
Devonian
Silurian
Ordovician
Cambrian
TABLE 4.1
GEOLOGIC TI~E SCALE
4-3
EPOCH
Holocene
Pleistocene
Pliocene
Miocene
Oligocene
Eocene
Paleocene
-
~1i 11 ions of
Years Ago
2
65
225
600
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t ~
I l.l
Ll
Lt
r.
r•
L.l
Ll
Ll
EXPi.ANA TION OF MAP SY MSOLS
------
.--------~----
Approd•te COfltatt of surficial deposits
u _.... ---.....::;~,...-·-;;;::=;----· ....... ..
fault
Lbng Glsi!K .llt!en! awroxt•uly loc:aUd; short Gashed iltlere 1nfernd;
.. ' ~
tlot.ted wtlere eoraculed. u t11dtut~s upthl"'OO!! side wtlere. direction
of abp'la«~~ent 1s ~. Arrows. 1ndfcate relilttn lateril IDVMent.
• • g ..,...------......... . Thrust fault
Long clashed where &,'lproxf•tely loc:aUd. short d.lshed where inferred,
dotted -"ere cone~tecl. leetll 1ndh:au upt.hrowt stde·.
--v--~----·-· -.......... .
Approxt•t.e nfs of intense si!Nr zone of vutable lllidttl. possibly
•rUng 1 thrust f.Oiilt
Dotte<S llbl!te ~oncule.i; teeth 1nlllate possible uptlt'/01«1 side of
postul&ted thrust.
t ·---+., .• --:....
lintfeHne. showing crest line t Sync1fn~. thow1ng tro\lgh ~fne
long dulled. Where approx1aately1ocatec1; lm>tt tncUc.uu r:1111ge.
locat.t0r1 ot nmplf .ated lly t~ tL:>. (;eolcgfcal Surye~ -iing the
>etu$CU!II-arson Clr tht! lead-a.lpha ~~etll<.j_ ·~':.l.!ln!J Np n~r •. field
nlllbrr, .nd the -calculated •fneral age. !1 ~ b1ot1tt!, Hb -hornblende.
l'i~·iluseovlte. Act -actinolite. Zr -zircon, ·'" -wllole rode. . . ' "'
-~
~
loaitton of sa~le dtted by Tumer 1nd Smith (197·~) ll!ifng t~ potnsium-i
·~ •ttm, showfng •P 11Vlilber, field nw.ber. and the ulcull.ted
•ineral age. 8i -bfottte. Hb-hombll!llde.
x+ .
foun locality in ·llllftt 111¥, Pls. anrS DSls.
Strtlte and dtp of beds
4-Oftrt.~td ss
-t-Vertical
-1-ApprodJOI1.e. esti•ted fltli dist&nt obsetvit1"ons
2.0
StrHe Md dip of fracture cleavage
~ lnel1ne4 eo
......-f-..1 VerUcal
StrUe and dip of slaty or adal plane c\rnage
r----1 lnelined
c;o
f---1 Vertica.l
Strike and dfp of shear planes. ~~tt.uorphte folfatfon or scMstosit,Y
-v-111C1fned
30
-+-Yertfc:al
Strite and dfp of ignecus flew fo11aUon
~Inclined
30
-+-Verticil
leal"lng and ploogi! of 11ntlti0rl
Strike and dip of joints
"""E:r" Inclined
~0
-e;..;-Yertic&l
REFERENCE; cstJT£Y • a;n .ll. RECONNAISSANCE: GtOLCXiiC W.ll" a GEOCHFt()ffot..o;Y J
TALkEETNA MOUNTAINS QU~OIIl.NCiLE, NO«!ttEftN PART or AHCHOIU.ctE QUAORAN~L~.
AND SOO'niW'EIT CORNtft ot HEAl,.Y QUlDRAHGll:-. ALASKA, U,s.e.S. OP~H r1U: IU~"l' 71-55:a..lm.
REGIONAL GEOLOGY
~-· }-.:-
' ~ 0 3 6 12 t
•
SCALE IN MILES I
mne~
ROCK UNITS ARE LISTED IN FtGlJRE 4 I b
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u ..-
0
N
0 c
Q)
(,)
(,J .,..
0
N
0.
VI
~·
Qs
Tsu
Tv
Thgd/Thgd
Tsmg/Tkgr
Kag
Jtr/Jgd/Jgdm
Jam
"Rv
"Rvs
Pzv/Pls
REGIONAL GEOLOGY
. MAP UNITS
Undifferentiated Surficial Deposits
Undifferentiated Sedimentary Rocks
Undifferentiated Volcanic Rocks
Biotite & Biotite-Hornblende Granodiorite
~ Granites and Schists
Argi 11 i te and Graywacke·
Quartz Diorites & Granodiorites
.Amp hi bo 1 i tes ·
Basaltic Meta vo 1 cani c Rocks
Metabasa 1 t and Slate -·
Basaltic to Andesitic Metavolcanogenic
Rocks with Interbedded Limestone
Modified after Csejtey and others, 1978.
'
FIGUBE 4 •. 1 b [1m·l
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/
~' ,,~
/
r'
,;"',/ ,
/----------
DEVIL CANYON /
OAMSITE ~as\ Tbgd
REF£REHCE: USGS. TAU<EONA MOUNTAINS (!r4)AND(l>-5)
4-6
""xKr:.;j yu;• .~ ...
P,< ..
lt{ag \
--78
Tbgd
GEO .. LOGIC. MAP. OF .DEV ... l ... L .. · .. · .c. A .. N. Y.ON RESER.V.OlR ... '' . ' '>' -,_ --· -' . . ' - '
,
'I -·
TSlJS£NA C/t'EEI(
I)
..
LEGEND
} Tv J ANDESITE AND ANDESmC BASALT
Fl.OWS, VCll.i':ANIC a..ASTlC.
I Tbgd I BIOTITE GF.ANOOIORrt£. OUARlZ
DIORITE, DtoRIT£
f Koo .. 1 ARGILUTE
;t_. STRIKE ANt) otP OF BEDS
!J-STRIKE AND blP OF JOlNTS
----CONTACT~·l..OICATED A?fROX:i~Ti·
.NOTE:
I} GEOLOGiC .IAAPPING UNDERTAKEN. AT A
SCALE.OF l:l£,000 a 1:63,~
o l 2 I
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5 -1980 GEOTECHNICAL INVESTIGATION
5.1 .. General
The 1980 investigation program was developed as the first phase in defining the
geologic and subsurface features identified by previous investigators at the
Watana and Devil Canyon dam sites. In adaition to the review of information
published, discussions were held with people knowledgeable--of the area. In
particular, meetings were held with the COE to discuss details of their 1978
program and the experiences of those people directly involved with the
iO\!estigations,
The 1980 program was developed to consist of air photointerpretatioft, surficial
geological mapping, diamona core drilling, permeability testing, in-hole
geophysical logging~ bm~ehole photography, instrumentation, auger drilling and
seismic refraction sur11eys.
The program was des~gned to provide the maximum amount of informat·ion relative
to site geologic and geotechnical conditions towards establishing the feasibil-
ity of the project within the budgetary .restraints of the program.
·The scope of the 1980 program was principally directed to define:
-Site geology.
-Reck type and quality.
-Engineering evaluation of rock conditions.
-Borrow sources for construction materi a 1.
-Ground~ater regime.
Permafrost.
Specific geologic and/or geotechnical features or conditions that were deline-
ated during previous studies and·considered to warrant further investigation
have been, discussed earlier in this report.. The pc.rticular features selected
for study during the 1980 program were:
(a) Watana Site
-Shear zones called 11 The Finsu and 11 Fingerbusterl• located upstream and
downstream of the proposed dam site.
••Buried stream chann«·!n located on the right abutment (north of the dam
·site •
• A possible slide .block on the right abutment.
-Potential for a shear zone beneath the river channel,.
(b) Devi 1 Canyon S'ite
-Stress relief joints and shear zones along left (south) abutment.
5-1
. • ~ .~ . ' r . •• •.. ; t
-Rock discontinuity through the Cheechako Creek borrow area upstream of
dam.
-Possible shear zone or buried channel beneath saddle dam on left
abutment.
To fulfill the objectives of the 1980 program, the following work was undertaken
at both dan sjte·s: ·
-Air photoit1terpretation.
Geologic mapping.
"" Diamond core drilling.
-Auger drilling and sampling.
-In-hole geophysical and water pressure testing.
Seismic refraction survey&
-Laboratory testing.
-Installation of piezometer and thermal probes.
Detailed scope and methodology for the work performed are presented in the
following section~.. A detailed discussion of the results of the program are
presented in Section 6. The air photointerpretatio·n was subcontracted to R&M
Consultants and was scheduled ttr be completed prior to the field geology pro-
gram. However, due to scheduling problems, the work was not completed as plan-
ned; therefore, this program had to be planned on the basis of the previous site
investigations. only. The airphoto worK ios scheduled to be completed soon~ and
the results wi 11 be presented in Appendix F of this report within a separate
volume.
5-2
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II
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5.2 -Scope and Methodology
(a) Geoloaic M~ping
The 1980 field program was -direct~ at the mapping of the dam sit~s. Geo-
logic mapping of each of the propo·sed dan sites included walking selected
ground traverses and noting all bedrock outcrops and unconso 1 idated mater-
ial to expand and verify the previ.ous geologic mapping. Aerial photo-
graphic base maps at scales of 1:6,000 and 1:24;000 were us~d in mapping
the Watana and Devil Canyon dam sites respectively. At each exposure~ the
lithology, type of material, bedding, jointing, weathering, outcrop size
and elevation was noted and plotted on the base .maps.
Geologic reconnaissance of the Devil Canyon v·eservair and potential tunnel
routes, being studied during pro.~ect definition studies, was performed
between Portage and Tsusena Creek:; and extended up to 5 rni 1 es north and
south of the Susitna River_ A helicopter reconnaissance was made within a
10-mile radius of the Watana dam. site to delineate unconsolidated materials
as potential bcrrow sources. The mafjping of the reservoir areas were }l1ot ..
ted on either 1:12,000 aerial photographic or a 1:63,360 USGS topographic
base map;
(b) _iubsurface lnvestia.ations
( i ) D i amond Core Dr.J.ll i ng
Diamond core drilling was performed in the foundations and abutments
of both dam sites utilizing a skid-mounted Longyear-34 diamond dri 11
with a two or three man crew to operate and maintain the rig.. A to-
tal of 3800 fP""\t of drill'Lilg wa~-"perctorm~g-~ _All Togging and super-
vision was conducted by a geologist w11o described; pnotographed and
packed the l"nck core. and supervised testing ·anci 'instrument installa ....
tion.
Prior to the start of diamond. core drilling, all holes war'.~ cased
through the overburden into sound rock. The casing was left in the
hole to p~rmit subsequent testing and installation of instrU&-nenta-
tion.
All drilling and testtng was conducted by R&M Consultants and their
subcontract.~r, The Drilling Company, uraier the direction of Acres
American Incorporated.
A stlllmary of the ari 11 i ng activity fo.r the 1980 field season is
showra on Table 5.1 and Figures 5.1; and .5.2. Drilling stmmary logs
and reports are cont a tnad in Appendix B •
( i i) fermeabi 1 ity Te~ti ng
Permeabi 1 i-ty testing was .conducted in a 11 the <li a.100nd dri 11 ho'le~
upon completion of the core dri 11 ing. Prior to testing~ each ho 1 Et
5-3
tA ' • A' ' , • 't • • .. • • ;,.
(iii)
1 • I 'l,,
9
"'
4
' • • ' D •
, . ' • • •' I • . • .
• .~ • ~ • .!'
was thoroughly flushed with clear water and the dri 11 string with~
drat•n. Following flushing of the hole, a packer assembly con$;isting
of two inflatable·. packer elements separated by a perforated section
of pipe and connected to the surface by a steel ri:ser pipe and
rubber inflation ~ose was lowered into the borehole to the desired
depth. The test procedure involved inflating the packers with
nitrogen to isolate a section of the borehole~ pumping water under
pressure into the test zone and recording the flow rates. Based on
the flow rates.s hydraulic heaa, hole diameter ~nd length of test
section., tl:le permeability of the rock over the test section was
calculated. In general, the pack~r assembly was installed to the
bottom of the hole with tests being run over 16 .. 1 foot intervals as
the a~isembly was withdrawn.
rne permeab i 1 i ty for each test section was cal cu 1 a ted using the
following formulas:
Q ln 1 k = 0.0679 2 i LH r
Where: k = permeability, em/sec
Q = constant rate. o.f flow, gpm
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L = length of test section, ft and L > lOr
H = differential head of water, ft
r = radius of hole, ft
ln = natural logarithm
·····'·--·1
1-. A maximum test _pressure equal to 1 psi per foot of vertical depth
below thf.: grourid surface to the water table, plus 0.5 per foot of
vertical depth below the water table down to the center of the test
section, was used.. However,.. in no case was the pressure allowed to
exceed 200 psi. The actua 1 gauge pressure was adjusted to take into
consideration the de~:·h of water table.
The test data and calculations are presented in Appendix B for
Watana and Delli 1 Canyon sites.
In-Hole Geophysical Logging
In-hole geophysical logging was carried out in all three di·amond
dri 11 holes at the Devil Canyon site anc t't«l holes at the Watana
site. BH-2 at the Watana site caved badly and was 'not tested.. A
total of 3,-225 linear feet of logging was completed. The logging
procedure involved lowering a geophysical probe in the hole. on a
wire line with the data being returned to the surface and recorded on
a self-contained logging unit. The logs run in each hole ine1uded~
temperature, caliper, resistivity and velocity. This information is
now being incorporated into the comprehensive logs.. The work per-
f~rmed by. EDCON,· Exploration Data Consultant$ Incorporated, under
'I l::;"
5-4
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a subcontract to R&M Consultants.
The results of the geophysical logging will be contained in the
fint1J r-eport ·as an appendix.
(iv) Bo~ehole Photograehy
Boreho 1 e photogr-aphy was attemptea in three of the di amend dri 11
holes~ BH-6 and BH-8 at Watana~ and SH-1 at Devil Canyon without
success. Prior to using the real camera, a "dummy" camera unit was
lowered in the holes to check for any obstructions and safe passage
af the unit. In all three cases~ ~t became lodged in the hole. The
'
1 dunntY' unit was recovered in all cases, but it was not considered
advisable to lower the real camera, as chances of it being lost in
the hole or damaged were very high. The problems apparently were
related to the inclination of the holes and the fractured nature 9f
the rock.
{ v) Instrumentation -----·-
To monitor the groundwat,er a~1 permafrost conditions in the bedrock,
piezometers and thermistor strings, were installed in all three
boreholes at Devil Canyon (Figure 5 .. 2) and BH-6 at Watana (Figure
5 .. 1).
il1e piezometers used were a pneumatic type assembly manufactured by
Petur Instrument C\,."'mpany ~-The pneumatic type piezometers were
selected basi!d on the fact that subfreezing temperatures were likely
to be encountered in the upper 'portions of );he holes which would
cause blockage. in conventional ~tandpipe ?iezometers. Pneumatic
type piezometers ar~ ~1so quick and easy to read as well as being
accurate which is a prime consideration during winter months ..
The thermistor strings were manufactured by Instrumentation Services
in Fairbanks, Alaska. The thermistor strings were each 250 feet
long with redundant thermistor points installed at 3, 6, 9, 12~ 15,
18, Zl, 25, 50, 75, 100, 125, 150, 175, 200 and-250 feet. A 40
strand cable was used to connect the-thermistors to the surface
where a quick connect p'lug on the cable is plugged, into a switch box
~that in turn is connected to a portable readout box. The system is
designed such th;a,t two readings are obtained at each depth so
readings can be cross checked. Each thermistor point was initially
ca.librated in the laboratory before installation ana a computer
program set up to convert readings to temper·ature, taking irtto
acco._,.nt the correction factors for each thermistor. An accuracy of
!_.05"C is obtained with this equi prnent.
The installation details are shown on ·Figure 5.3 and 5.4 for Watana
and Devi 1 Canyon, respectively.
5-5
(vi) ~uger Drilling
Auger dri 11ing was-conducted at both sites to expand the work done
by the previous investigators to define theopotential borrow areas.
At Watana (Figure 5.1), four holes were drilled in Borrow Area D and.
rdne in Borrow Area E~ while two were drilled at Devil Canyon
(Figure 5 . .2) for 260 linear feet total. The original program was
more extensive; however~ difficulties were encountered in advancing
the auger due to boulders, cobbles" and hard ground conditions.
The program initially used a platform-mounted CME-45 rig that was
replaced by ·aCME-55 for the difficult drilling conditions. Dril'"!O
ling was performed using a hollow stem continuous-flight auger
string~ having an 8-inch and a 3-1/4 inch I.D., to a maximum depth
of 35 feet. Material samples were collected continuously in the
upper 10 feet of the hole -and then at 5-foot intervals using a
sp 1 it-spoon samp 1 er. The s amp 1 i ng procedures consisted of dri 11 i ng
the augers down to the required sampling depth, removing the inner
plug and stem~ installing the Split-.spoon sampler and advancing it
18 inch.res into the soil below the cutting head bY driving it with ~
140 lb harrmer falling freely 30 inchas {Standard Penetration Test).
The samples were returned to the surface, logged by a geologist and
prepa~ed for transport and storage. In most cases, 4 to 6-inch long
thin brass 1 iners were used inside the spl i t ... spoon samol er which
allowed se 1 ec-ced .s amp 1 es to be capped and sea 1 ed for futu:-""e testing.
Following complet·fon of the hole, the. auger string was withdrawn and
the h9le backfilled with the drill cuttings.
The logs for these holes are given in f\ppendix C-1. The properties
of the borrow materials are discussed in Section 6.
(vii) ~ismic Refraction Survexs
Seismic refraction surveys (seismic lines) were performed on the
abutments of both dam sites and in the bort~ow areas and relict
channel near Watana to extend the previous studies. Eleven tra-
v.erses totalling 27,800 feet we:re run under this program~· The work
was performed by Woodward-C1 yde! Consultants ( VlCC) under a subcon-
tract to R&M Comsultants, and the results are presented in Appendix
0. The location·s of the lines are also shown on Figure 5.1 for
Watana and Figure 5.2 for. Devil Canyon.
At the Watana d;am sitel' four traverses were shot in the immediate
dam site.. Two ·of these lin~s crossed· the right abutment anti the
relict channel area. ·A third line is located upstream of th.e pro-
posed axis on both abutments, and the fourth i-nvestigated a topo-
·gr:aphic depres.sion a mile upstrean of the axis on the north side
of the river •. Borrow Areas D and E at Watana were explored by four
seismic lines.{two within each area).
At Devil Canyon, the three seismic lines were run on i:ne left
5-6
,···;j
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(south) abutment acros$ the sma 1 1 1 ake and adjacent s 1 opes to in-
vestigate the overburden thickness in the proposed saddle dam area
and the existence of a possible lar-ge shear zone
t:) Laboratory Testing,
Representative soil samples obtained from the potential borrow sii;es of the
Watana area were tested to determine their physic.al properties and verify
field classit.ication. A total of 21 samples were tested to determine. the
soil's moisture content, Atterberg limit, grain size distribution and
Modified Proctor density. A summary of the testing program is given in
Table 5.2. All twenty-one samples were tested using the appliable ASTM or
AASHTO standard procedures. The results of the testing program are
sumnarized and the data is presented in Appendix C2.
5-7
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TABLE 5 .. 1
SUMMARY OF DR~LLING ACTIVITY -1980
HOLE GROUND DEPTH AN11LE WITH
NOo LOCATION ELEVATION, FT FT ORIENTATION VERTICAL
Watana
BH-Z Ri-ght 1,835 401.0 N45E 55°
Abutment
BH-6 Right 1,605 740.4 S45W 60°
Abutment
BH-8 Left 1,976 750.55 N60E 60° . Abutment
Devil Canyon
BH-1 Right 1,415 750.3 S45W 67°
Abutment
BH-2 Right 1,214 656.2 N 60°
Abutment
BH-4 Left 1,353 501.0 SlSW 60°
Abutment
Note: Ori 11 hole locations are shown on Figure 5.1 (Wataria)
Figure 5.2 (Devil Canyon)
5-8
SIGNIFICANCE
Fingerbuster
shear zone
Suspected
fault
Powerhouse
geology
Powerhouse
geology
Dam
foundation
Suspected
shear zone
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TEST (PROCEDURE)
Grain Size Distribution
ASTM: U422-63
Natural Moisture Contents
ASTM: 02216-71
Liquid Limit~
ASTM: 0423-66
Plasticity Index
ASTM: 0424-59
Modified Praetor Density
AASHTO T-180 Method 11 A11
AASHTO T-180 Method 11 011
TABLE 5.2
SUMMARY OF LABORATORY TESTING
NUMBER OF TESTS
Barrow Area
Deadman River
D E H Creek Channel
8 8 2 2 1
8 8 2 2 1
6 --2 2 --
6 2 2
1
--1 1
NOTE: Laboratory test results are included in Appendix C-2.
. 5-9
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Ra=: 1).S.ARMY CORPS. Of ENGIN.EERS
SUPPLEfl.ENTAL FEASIBIUTY
REPORT 1979.
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A
LEGEND
TEST PIT •
AUGER HOLE J CORP Of ENGINEERS. 1978 CORE DRILL HOlE
ROTARY DRILL HOLE
BOR~HOLE · J _sUMMER J980 PROGRAM
AUGERHOL£
SEISMIC UNE : ..
OM, SW-CORP OF ENGINEERS. 1978
SL -SUMMER 1980 PROGRAM
d.. CROSS SECTIONS
8WJ LOCATION OF JOINT MEASUREMENTS
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V·lATANA LOCATION EXPLORATION ~~~~==~~~~~ 5-10
BORROW .4REA F
NOTE,
API7
0
I) SECTION SH\)WN ON fiGURE 6.£
2) TO?OGR.APHtt:;: ttntroURS ARE.
APPROXIt!ATI
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R:~~•USGS, T~ &.l::YJ,It...L,S (b-5}, AI..ASI(A 0~-G.£..
~v.:.r..n 1.'-E~OIAN~ T 3.2 N. ~ IE• S~ M;o 33.
5-11
DEVIL CANYON LOCATION EXPLORATION t~~AP
LEGEND
• OH SOREHO:..ES. ::::"'.:SSW. · 1 ··07 Rtt"':_~~.!!:.? .• ~.,
f£50 ]
: .~ BH BOREHO:..ES-S"J~:~!::R lSSO F::r~.:;~~.! .
i • TP, S, TEST PITS AN:nt 11\EN:H~S
1 . BUt\gAU OF fiEQ.A~.~ATIONt !:~
SW SEISMIC UN~-
i CORP OF ENGI!\tERS, 1$7E
r-SL f SEISMIC UN~-
SUMMER 19SQ; ~OSRAM
NOTE;
TO?OG..=-..:,pr~ Cl)~rr~ t:::.::
APPROX:.!t.TE::
SECTION $HQ~ ON FIGURE 6 li3
COI-iTOt.J? f,~~ 'S!:i t c:.:<.1.
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..------------------...-_.. ... __ • _____________ '!'I' ________ ....,OIIIIIIi..., ... ,=,_--.,.,. ..
To Readou.
LEGEND ro y;_fac
3/4-inch I.D .. threaded ave;:~ burden
OVerburden
Roc""''""k--
joint PVC ....---
grout· tube ,_.
Thermistor
points
NQ-Borehol~
(2 .. 98" Diam.)
inflatiol! line
and piezometer readout tubes
Holes drilled in
l?VC grout tube ...-
to e.llow 9rout
to escapa
Pneumatic:
piezometer~~~~
Epoxy-fil~ed
tip Slotted PVC 7---pipe to protect
pie~ometer
Pe~fr~st cement grout
.TYPICAL INSTRUMENTATION INSTALI.M'ION
WATANA DAM SITE
NOT TO SCALE
5-12
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PVC grout tube
2-L~crr I.D.~---r.
~eaded joint
PVC casing
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Overb'-ade ~~...---.._
Bedrock
NO-Borehole
Thermistor
points
Diam.)
inflation line and
piezometer r~adout tubes
Permafrost cement grout
· i\~~.size · ,s.limline ""Q'o--·
2Q .... foot slotted----packeJ;'
section.
Three rows 0.010-
inch slots
~-inch J:.D.
g:r:out Vf'.n t
Noi:e:
T\~o·piezometer/packer
installations -were made
~.n BH-1
5-foot slotted
~~~~z__,· section. Three rows
End
olu...,_....w~.., .. .
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T~PtCAL· ':INS.'rROMENATIOl~ INS'rALLiT!ON
OE7IL CANYON: BH-1 and SH-4
NOT TO SCALE
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6 -RESULTS OF THE GEOTECHNICAL INVESiiGATIONS
5 .. 1 -Watana
(a) Genera·l
As discussed in Ssction 3, the Watana dam site had bsen explored by pre-
vious investigators on a reconnaissance level (6, 5, 18, 19). This infor-
mation was then expanded by the 1980 Program using detailed geologic
mapping, three diamond drill holes~ auger holes and seismic refraction
surveys. The location of all exploration stations are shown on Figure
6 .. 1.
(b) Overburden Conttitions
Overburden tniclcness in the dam site aroa :ranges from very thin to non-
existent along portions of the valley slope to greai:er than 450 feet away
from the valley walls. The type of overburden varies from weqthere.d rack
and talus tD glacially derived tills with lacustrine clays to organic
materials. The type and thickness of overburden in the site ar1a has been
delineated by geologic mapping, drilling, excavation of test ~ ~ts and seis-
mic refra\~tion surveys. A deta·il ed discussion of soi 1 conditions and prop-
erties in :;elected borrow source areas are presented in Section 6.1 (f).
An isopach map of overbu-rden thickness is shown in Figure 6.2. ln generai,
the overburden on the valley walls and abutments in aJ1d around the Watana
site is thin, varying in thickness from 0 to about 10 feet. On the lower
slopes~ in the V-sraped portion of the valley, c;verburden is almost non-
existent consist-;119 primarily of talus. Above the br"eak 1n slope' on the
north side of the river, the overburden thickens and consists primarily of
g 1 aci al materia 1.. ·
Several local areas of thick overburden were encountered on both dam abut-
ments during the various phas&s of inv_estigation. Seismic line SW-2
(Figure 6 .. 1) shows a thickening of overburden to approximately 100 fest up-
slope of BH-2. A similar thick pocket of overburden was found on the south
abutment at DH-25 (COE~ 1978) (Figure 6.1) where over 80 feet of till was
dr i 11 ed without reaching bedrock.
Away from the valley walrs, the overburden consists princ.ipally of 5f]acial
si1ts9 sands, gravels and boulders. Where drilled:) the conta!!t between·the
overburden and bedrock is sharp. Seismic velocity of the unconsolidated
s·ilts, sands and gravels generally average in the range of 6,000 . .._ 7,000
ft/sec whereas the denser tills, boulders, and weathered rock range between
13~000 "" 14,000 ft/s~c.
A deep bedrock depression has been delineated on the north side of the
river extending frcm approximately 9,000 faet upstrecm and trending north-·
west toward Tsusena Creek. The ~¥idenre for this channel is based on
seismic refraction studies (14., .17, 18) and several drill holes (18) as
~. .t
shown Oh Figure 641. The lowest bedrock elevation encountered in the chan-
nel was 1,775 feet or 454 feet below the surface (DR-22). The overburden
in the buried channel consists of several sequences of till, lacustrine and
a, 1uvial (including outwash) materials. At least two sequences of fine
grained 1 acustrine material have been encountered. In DR-13~ _the COE re-
ported encountering a significant artesian condition, however the source of
the artesian pressure and relief on the cliffs was not addressed. In
annther boring, DR-22, an interval of pervious sands and gravels was en-
countered at elevation ,,,000 (200 feet below ground surface). Discussions
with COE people who super·.dsed the investigations r~vealed that during a
falling head permeability test on the interval composed of these materials
had takes as high as 50 gpm/"foot of head. Based on the limited information
on the statigraphy, it is very (jifficult to draw conclusions on whether the
till, glacial material or outwash =~jjosn:s are continuous over large areas
and a~ such, a reasonable assessment of the overall permeability of the
channel materials is not feasible at this time.
Previous borings performed in the river channel witnin the darn area show
a11uvillt1 thickness on the order of 40-80 feet. The material consists of
coarse sands~ gravels and boulders. Several boulders, in excess of several
feet t~i~:::k, were encountered during the investigation.
(c) Bedrock Geologl
(i) Lithology
The bedrocl< at the Watana dam si.ta consists of granite and quartz
d'1orite, ur:desite porphory~ and tuffaceous siltstones and sant!:5tones
(Figure 6.3). Areas of bedrock exposure are shown on Figures 6.2
and 6.3. l'he dan site ·is primarily underlain by an intrusive dio-
rite body which varies in compasition from a granodiorite to qt.lartz
diorite.
The diorite is a pink gray-green, medium grained rock composed of
feldspar, hornblende, biotite and quartz, and is generally fresh,
massives competent and hart',, The most common mafic mineral is
hornblende. The diorite has been intruded by felsic and andesite
porphory dikes 9 and zones of hydrothermal alteration and secondary
mineralization consisting of quartz and calcite are commonly fourtd
in rock fractures ..
An extrusive porphoritic andesite_ flow stratigraphically overlies
the dioritP. and c;--aps out downstream along the left abutment of the
proposed dam axis. Field mapping indicates that the thickness of
th·is. unit may range up to 100 feet downstream of the dam area~ The
andesite is a green to gray-9;r-een rock :Which generally contains
phenocrysts of plagioclase witn occasiona1 small fragments of argi 1-
lite. It' is gene.~al'ly fresh, hard and competent. Occasional in•
elusions of diorite hav~ been delineated within the ~·.,desite in the
western part of Quarry 11 Aii. Variati-ons within the 'fiow have been
-'
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observed in this area that indicate its composition may include some
rhyodacite and dacite. Near the downstream end of the dam area~ the
m~fic content of the rock increases making it more basaltic in com-
position.
The contact between the andesite flow and the diorite was encount-
ered in BH-2 and BH ... a (Fi~ures 6 .. 1 and 6.4). Simiiarly the COE
borings DH-21 and 24 p~metrated andesite dikes :Jn the 1 eft abutment"
The nature of the contact in BH-2 is unclear, in that a secondary
shear zon~·corresponds with this contact resulting in poor quality
rock. The contact in BH-8 was intersected at a depth of app·roxi-
mately 50 feet. The· r-ock is this zone was highly fracturea and
jointed with clay seams extending over a dist<2nee of 10~15 feet ..
Core recovery was on the order of 70-80 percent.
A sequence of tuffaceous siltstone and sandston'as a~r ~xp0$.00 tn the
c 1 iffs approximate 1 y 5, 000 feet downstre·am of the ~.;-~. ~i-~ which are
overlain by the andesitic (basaltic) rocks (see rigur ~~ 6.5}. These
rocks are composed essentially of volcanic debris, tht: siltstone
being t\ medifJll gray, fine grained rock that exhibits some sha1y
weather·ing while the sandstone has a buff colored groundmass with
inclusions of feldspar,. quartz and argillite. The rock in the area
is generally sound and unweathered.
(ii) Bedrock Structure
Detailed joint surveys were performed at four stations around the.
Wctana $ite. Three of these stations (WJ-1 through WJ-3, Figure
6.1) were performed in the diorite along Susitna River in the vicin ..
ity of the proposed dan foundation~ while '.4J-4 (Figure 6.1) was per-
formed north of the site rA Tsusena Creek. Contoured stereagraphic
plots of these joints are shown on Figures 6.6 (a-d). Although cor-
relation between joint readings vary between stations~ it appears
that the most common joint set ranges from 320° to 350° with an
average dip of 80° NE. Joint spacings range from 1 to 5 feet.. Sev-
eral pronounced joint sets mapped at one station were nat found at
others. An example of this is the 45° NW dipping set identified at
WJ-3 which was not found at the other 3 stations. The reasons for
these variations may be due ta local variation in rock type and ex-
posure. However, additional work will be required to more accur-
ately define local and regional joint orientations~
Jointing was found in all the boreholes. · The joints were generally
closely spaced., open and. moderately weathered at the surface becom-
ing more wide·1y spaced~ tighter and less weath~red with depth.. Many
of the joint surfaces were covered of' rehealed by S·.\Condary mineral-
ization of calcite, quat"ltz and limonite ..
Several shear and/or fracture ,zones of varying sizes \'lere mapped
during the 1980 field program. The surface locations of th~se frac-
tures is show.4 on the geologic map~ Similar shear and +-c!~t·rre
zor;es were "dentified during the dri 11 ing program (see Appendix B).
~.tt~~e dri 11 ed, these zones a.re typified by highly fractured rock,
r.;lay gouge, slickensides and overall poor rock quality.
The two largest 5hear zones which were identi'fied in P}"evious
studies and were verified by this program are· located upstream and
downstream of the proposed dam (Figure 6. 3). The first of these
shear zones is evidenced in a bedrock exposure on the north abutment
approximately 3,000 feet upstream of ·the proposred dam axis. This
feaJcuY"e, cal1ed •tThe Fins 11 by the COE, occurs V·litnin the dior.ite
pluton, and is mapped in excess of 400 feet wide. The major shears
within this zone stril(e 310° and dips 55° NE. No evidence for this
zone has been obser\ed on the south abutment due to poor. bedrock
expo.sure.. The trace of this zone to the northwest may correlate
with a highly oxidized and sheared diorite outcrop on Tsusena Cr~ek.
This outcrop, which has t..~r~jergone hydrothermal alteration, is
characterized by clay gouge, mylonite and numerous s1 ickensided
surfaces. Other evidence which may support a northwest continuation
of "The Finsn is seen in the seismic refraction surveys on the north
abutment which show a lower bedrock velocity associated with the
trace of this feature (14, 18). AdditionaJ ly, the trace of the
feature closely coincides with a morphologic depression.
The second shear zone, called the 11 Fingerbustet~u by the COE, is.
located 2,500 feet downstream of the proposed dam:: axis on the north
abutment~ BH-2 intersected this feature. on the right abutment-The
boring dri l·led through approximately 100 feet of highly fractured,
sheared rock which contained clay seams antd gouge. The shear :zone
is coincidental with the andesite/diorite contact. This feature was
not mapped on ~he 1 eft abutment due to 1 ack of rock exposure~
Other sma 11 er fracture or shear zones were. mapped a 1 ong the left
abutment. These fractures were 1 imited in exposure and wi 11 require
fur·ther investigation during the 1981 program.
(iii) Rock Qualitx
The Rack Quality Designation (RQD) was determined for all rol!k cores
and ;,s graphically shown on the :ummary LO!QS in Appendix B-3.. The
rock quality encountered in the drilling was generally good to
ex.·~ellent with RQD's averaging between 75 and lOOS (see Table 6.1).
Ir1 general.~ rock qu.al ity increased with de1pth~ with tre upper 50-80
feet of the surface being weathered and mc1re fractured. Selow this
weathered zone, rock quality tends to increase with only lncalizer1
zones of fractured and sheared rock. These zones generally range in
thickness from 1 to 4 feet.
Thfr. poorest quality rock'was found in BH-2 which drilled through the
uFingerbustern shear zone. This bor·ing was sited downstream of the
fracture and directed N45E at an incl inatiQn of 55 41
• As se~n i~ the
boring l~gs, the shear zone was intersected at an approximate depth
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(e)
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of 10 feet and continued to an approximate hole length .of 100 feet
(vertical depth 65 to 80 feet). The zone, which corresponds with
the andesit.e/diorite contact, consists of highly fractured,
b~ecciated and sheared rock. · Repeatc>j grouting was required to
maintain hole stability. Below this zone, rock quality improved
with on1y localized zones of low RQO's encountered around 200~--210
and 250 fe~~ depths, respectively.
( iv) Rock Permeabi 1 ity
Water pressure tests were per-;~ .. ~ed in all of the borings, huwever
no testing was performed i:l~1'* ·· 650 feet in BH-6 and below 70 feet in
BH-2 due to unstable hole ~onditions (Appendix B-3}. Graphic repre-
sentation of the calculated permeabilities are shown on the Summary
Logs (Appendix B-3). Overall, rock permeability is relatively low~
ranging from 1o-4 to lo-6 em/sec. Water losses were some-
what higher in the shallower portion of the hcles.
Groundwatel· ----·-
The groundwater regime in bedrock is confined to movement along fractures
and jo.ints 'nithin the rock. Water levels, as measured during the drilling
program, rangad from 16 feet below ground surface in hole BH-8 to 147 feet
in 3H ... 6.. Although very little data is currently available relative to the
groundwater, it is assumed that the groundwater in the non-permafrost areas
of the north abutment is a subdued rep1 ica of the topography with ground-
water 5:Jradients being towards the Susitna River and its tributar·ies ..
Pern1afrcst
A limited amount of data is currently available regarding permafrost cond~·
tion at the Watana site.
Ten \:hermal probes, consisting of 3/4 inch galvanized steel pipes filled
with diesel fuel, were installed by the COE in boreholes on both abutments
to monitor ground temp~ratures. Multiple readings performr.!d over aS month
period on several of these thermisters showed permafrost conditions on the
south (left} abutment. Of four holes instrumented, all but hole DH-21
which was drilled beneath the r~ver gave -temperatures below freezing to the
bottom of the hole. The deepest hole was DH-28 drilled to a depth of 125
feet. Max jmllll cold temperatures r?qged around -0.7 to ... Q. 6 °C.
During the early phases of this program, an attempt was made to read these
instrt.111ents with the results summarized in Figures ri .• ] and 6.8.. Mpst of
the pi'"obes _on the (left) south abutment were blocked \~ith ice or showed
sub ... zero temperatures at depths of 15 to 30 feet below ground surface; and
it is, therefore, evident that permafrost exists in the south abutment at·
relatively shallow depths. Because of the ice blockag~~, and shallow
probes, it was not possib~.~ to determine the bottom depth of the perma-
fr.ost. Temperatures wi.t.,-\.n th·is shallow zone ranged from -0.01 to .... Q.52°C.,
No evidence of permafro~t.. was. observed from proh~s 1on the north abutment.
However., it was determined that ground tempera:tur"es are within 0.5°C of the
freezing point to considerable depths.
Auger drilling in Borrow Area 0 by both the COE and AAI indicates that dis-
continuous permafrost may exist throughout the aren,. Visible ice was iden-
tified in several of the soil samples to depths of 10 feet or more. On tt.e
south abutment BJi-8 (AAI, 1980), which has remained open from July, was ob-
served to "freeze back". It was first noted in September during the geo"'·
physical logging that the hole was 11 necked doWn 11 at about 175 feet and the
temperature at that depth was less than 0°C. The hole was next checked in
Hovember and found to be completely frozen. In preparation for installa-
. tion of the present (1980) i~strumentation, warm water was pumped down the
hole to thaw the ice. At the start of the melting operation, ice was en-
countered at a depth of 50 feet. Melting proceeded to a depth of 170 feet
where the hole was blocked by caving. A thermistor string was insta11ed in
BH-6 on the north abutment to a depth of 250 feet. · However, temperatures
have not yet stabilized in the hole. It is to be noted that this hole re-
mained open and unfrozen frnm the time of its completion in July until in-
strumentation was installed in November, therefore, the hole does not
appear to penetrate a permafrost zone.
(f) Borrow Areas
The 1980 investigatior program was planned to confirm the material sources
previously identified by the COE and to provide additional information as
to their geotechnical propertier, thickness ~nd areal extent. Primary.
emphasis was placed on defining the core and filter material sources and
verifying the quantities of rock fill previously identifi.ed near the dam
site. The explorations conducted included geologi-c mapping~ auger dril-
ling, seismic refraction surveys, and laboratory testing. The location map
for all the exploration progt""ams is given as Figure 6.1. The boring 'logs
are shown in Appendix C-1, the laboratory test program in Appendix c;.2, and
the seismic refraction study in Appendix-D.
( i)
(ii)
Rockfill Mater1a1 _ ..... ._
Two quarries previously designated 11 Quarry A" and 11 QUarry B" by the
COE (Figures 6.1 and 6.9) were investigat~. Additional surficial
mapping was performed in Quarry A on the south' .(left) abutment and
indicated the ~1\po~-;~d rock is primarily andesite overlying dior·ite
(Figure 6,.3). Thi$ dif·fers from the interpretation of the ea1·lier
exp1c~ation with diamond core drilling and detailed mapping to con-
firm the thickness and extent of the various rock units. Quarry 8
was investigated by additional surficial mapping and a seismic lin~
across the central section of the area (Figure 6 l). The data col-
lected indicate;; that overburden in this area m<~Y be as much as 300
.feet thick which would preclude exploitation of this qur1rry.
Core Material ~ Borrow Area D
This borrow area was identified. by the earlier irivestig.ations as a
primar~. ~Q_Urce af impervious and semi-pervious material for th~ da.m
construction~ The area 'is located 1~5 miles upstream of the dam
6-5.
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axis on the north (right) abutment (Figures 6.1 and 6.9). Four
additional auger holes and two al1dit#ional seismic 1 ines performe~d
during the 1980 program generally confirm the earlier findings.
Overburden throughout the area is very thick, ranging from 150 to as
much as 350 feet thick (14). The material in this area is composed
of a surface layer of natural ground cover of organic material, two
to three feet of boulders and organic silts underlain by glacial
tills of dense gravel silty sands. The tills rang~ from 15 to 25
feet thick and usually overlie a c1a.y to sandy grave.lly clay ..
Grain size distribution curves of the till samples te:sted in this
investigation (Appendix C-2) and thfa COE program (18)t show that the
material is well graded ranging from silt amf"yrav·el'ly sand. The
material is generally dense to very dense in-situ antj has a natura.l
moisture content ranging from 6.6 to 25.7 percent with an average of
11 percent. The finer fract.ion of the material is generally
non-plastic to very lm.., plasiticity (PI ranges 2 to 12). The shape
of the compaction curves indicate that moisture content will be
critical in obtajning maximum dens·ity and strength.
{iii) Filter Material -Borrow Area E
Th'is borrow area was identified as the main source of filter and
concrete aggregate materi a1 by the COE {18). Borro1w Area E is an
alluvial deposit fanned at the mouth of Tsusena Cre!ek on the right
bank of the Susitna River approximately four miles downstrean of the
dam site (Figures 6 .. 1 and 6.9). Nine auger holes rang1ng from 5 to
31 feet de~p were drilled in this area tt> expand '':he previous work
{Appendix C-1). As. well additional seismic refraction 1 intas (18}
were run to confirm the thickness of the alluvia 1 materia 1 and tJ~e
limits of the proposed Borrow area.
The auger drilling indicated a th-in layer of organic mate.t•ial and
silt over most of area varying from 0.5 to 2.0 feet thick. This
layer is underlain by 0.5 to 3 .. 0 feet of silty sand to clean s,and,
below which is a 6 foot thick 1 ayer of sandy gravel. The sand and
gravel materi a 1 s are ~ 11 rounded particles up to 4 tnches. and
diameter and are clean and well gra:ded. The size of the particles
appears to increase below 10 feet w·tth variable cobble and boulder
content that hindered the drilling. The water table in this area
varies from 7 to 16.5 feet below the g.·ound surface and near-the
base of the sandy-gravel 1 ayer.
Twa hales were drilled on a sand bar further upstream on Tsuserr
Creek {Figure 6 .1) in an attempt to exp,'1nd the 1 imits of Borrq \r-ea
t and provide additiona·l quantities of mater·ial. Both holes \W.... ~
terminated at less than 10 feet deep due to a high corn:.entration of
boulders. However the overburden profiles compare favorably with
the work from the main sectim1 of trB bftrrow area. The two new
seismic lines ran ore the northwest portion of the area confi.rm that
the alluvial materials vary in thickness fr.om 30 feat to as much as
6-7
{iv)
200 feet 1oca 11 y with an average thickness of 30 to 50 feet.
G~a~n size distribution curves of the bag sample material show that
the upper few feet of material consists of sandy silt grad.ing
downwards to silty sand. This 1 ayer is generally poorly graded and
relatively fine grained with 30 to 60 percent passing the No. ;~oo
s.ieve.
Tne underlying material is classified as sandy gravel to grav~!lly
s:and with trace to some siit .. This material is relatively cltaan
with a few fines and well graded. The grain size distributions for
this layer show very good correlation with the results obtained by
the COE for Bor·row Ai"'ea E. Natural moisture content for the sandy
silt layer range from 15.7 to 27.3 percP.nt. The gravelly sand layer
by comparison ha!.i na.tural moisture content ranging from 4.4 to 9.8
percent (all sample:; were taken from above the water table) ..
~
All the new data is consistent with the aar1ier data gathered by the
"COE. However, based on the additional holes and seismic lines the
borrow area can be expanded upstream a 1 ong Tsusena Creek.
Other Potential Material Sources -·== F!
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During the COUl"'Se of the current and previous investigations within I I
ttte dam site aorea, 3everal potentia1 sources of materials, other
than those discussed above, 'Here identified (Figure ~ .. 9).·---Howevel'"l 1. I,
considerable a1dditional investigation will be required to evaluate
the type, suitability and quantities of ma.terials available from
these areas,. The various sourcf; areas ar~! discussed below in terms •
of the types of materials llhich might be obtained from them. I
-Sources of Rockfi11 Material
Considerab·le rock excavation wi 11 be required during construction
for the darn foundation, underground powerfiouse, penstocks and
spillway. This rock and soil from the v~~ious excavations may be
suitable for use in the rockfill portions of the dam depending on
the quality.of the matet"ial and the construction schedule.
-Souv'ces of Core Materi a1
Based on reconnaissance mapping and exploration, three areas were
identi.fi1ed as potential sources of core material. Several bag
samples were collected to aid in the preliminary definition of the
materials. The first area, designated as Borrow Area H, is 1 ocat-
ed southwest -of the Fog Lakes area (Figure 6.9} and is approxi-
mately five to seven miles f~om the dam site. The topography of
this area is generally flat ·:o gently rolling. Most of the sur-
fat;;e is covered by shallow swamps and marshes indicating poor
drainage and relatively impe~vio.us underlying materials. Slump
exposures along Fog Ctee!c.and the Susitna River indicate the
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underlying materials to be a relatively thick 1ayer of lodgement
till consisting of silt., sand, and gravel and some cobbles. with a
trace of clay. A large ice wedg~ was observed in a slump exposure
on the west end of the site indicating that the till may be frozen
locally.
The second area is located to the east of Borrow Area D on Deadman
Creek one to two miles upstrean from the confluence with the
Susitna River and approximately three miles from the dam site .
Based on cliff and s1ump exposures along Deadman Creek and the
morphology of the site., three types of materials \4Jere identified
in this area. These materials consist of glacial outwash., ab 1 a-
t ion till and lodgement till. The outwash consists of a relative""'
ly clean, medit.m to coarse grained sand with some gravel, cobbles
and boulders.; The ab 1 ati on ti 11 is composed primari 1y of silt and
sand with minor amounts of gravel, cobbles and clay, while the
lodgement till is a sandy, clayey si1t with some gravel and cob-
bles and generally very compact.
The topography of this area is generally flat to gently rolling
with several old channels superimposed on tl.a surface. These old
channe.ls are indicative of fluvial processes and it is, therefore,
assun, 1 that much of this site is blanketed with a layer of out-
wash material of variable thickness overlying a series of tills.
The third area is located directly west of the present Borrow Area
D. A r>eview of the previous data suggests t$-aat the percentage of
tills and clay-rich material increases to the west. Additional
investigation will be required to verify this.
-Sources of F i 1 ter Materia 1
In the upper reaches of Tsuser~a Creek, the COE de 1 ineated two
areas designated Borrow Area C and Borrow Area F (Figure fi.9)_
which may be suitable sources of filter material. To date only a
1 imited amount of investigation, consisting of test pits in area
"F 11 and three sei~smic lines in area 11 C11
, has been performed
(Figure 6.1) .. Additional investigations .and testing will be r~
quired to verify the type and quantities of materials ir. each
area.
Based on surficial mapping and general reconnaissance in the vic-
inity of the darn site, it would appear that the area surrounding
the confluence of Clark Creek and Tsusena Creek, approximately
five to si.x miles north of the dan site, may provide a potential
so urea of fi 1 ter materia 1. This area appears to be composaj pri-
mari i y of a 11 uv i a l materi a ls and r e·worked g 1 ac i a 1 outwash~
One sample of material was also co 11 ected from a gravel bar
6-9
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exposed in the river channel. sl ight1y upstream of the dam. The
grain size distribution curve shows that this. sample is a gravel
in a sand matrix with a few cobbles but few fines. This is a near
surface sample and may not be representative at depth but does
show that further investigation of this material for filter
materia 1 is warranted.
(g) Reservoir Geology
Preliminary reconnaissance mapping of the.Watana Reservoir was performed
for the 1980 field program. This consisted of flying over the reservoir
area and identifying principa·1 rock types and general types of surfici a 1
material.
The topography ·of the Watana Reservoir and adjacent slopes is characterized·
by a narrow y .. ,shaped stream-cut valley super imposed on a broad U-shaped
glacial valle,y .. Surficial deposits mask much of the bedrock in the -area,
primarily in the lower and uppermost reaches of the reser'!i'Dir. A surficial
geology map .(..'f the re~ervoir~ prepared by the COE, aistinguishes till,
1 act!strine and alluvial deposits (18).
(i) Surficial Deposits
Generally, the lowe~" section~ of the Watana Reservoir and adjacent
slopes are covered by a veneer of predominantly glacial till with
scattered outwash deposits. Two main types· of ti 11 have been 'iden-
tified for the area; ablation and basal tills. The basal till is
overconsol idated, has a fine grained matrix (more silt and clay} and
has a low permeability~ The ablation till has less fines and a
somewhat higher permeability. Outwash deposits cor~sist of cobbles,
gravels, and sands that exhibit a crude stratification and are well
drained.
On the south side of the Susitna River, the t-og Lake area is charac-
teristic of a fluted ground mordine surface. Upstream in the Watana
Creek area, glaciolacustrine material forms a broad; flat· plain
whi~h mantles the underlying glacial. till and the semi-consolidated
Tertiary sediments. This material consists predominantly of strati-
fied, poorly graded~ fine grained sands an\1 silts with lesser
amounts of e1ay. Significant alluvial depo0its exist in the river
valley and consist of re-worked outwash and a11uvium. Deg1ac.'\ation
of the area was accompanied by t~e filling in \lf the Susitna River
valley and subsequent modification by alluvial processes resulting
in the formation of flc~dplain te~races. Ice disintegration feat-
ures such as kames and eskers have been observed in the river
valley.
Permafrost exi.sts in the. area as evidenced by ice wedge po ly.gons,
stone nets· :.nd s 1 umpi rca of the g 1 aci al till over l_vi ng permafrost.
Numerous slumps have been identified in the Watana ,Reservoir area,
espe1:ially in sedime,1ts comprised of basal till and in some instan-
ces the Tertiary sedi\4emts. The majority of the slumps occur in
frozen glaci.al ti 11s cf Watana 0i'eek area and on an unnamed creek
6-10
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(ii)
between Deadman a.-~d Watana Creek ..
Bedrock Geology
As previously discussed, the Watana dam site is underlain by a dio-
rite pluton. Approximately three miles upstream of the Watana dam
site, a non-conformable contact between argillite and the dioritic
p 1 uton crosses the Sus 'L~na River. Ar approximate {ocation of this
contact ·has a 1 so been· del i neated on Fog Creek, 4 mi 1 es to the south
of the dam site. Just downstrean of the Watana CreekSusitna River
confluence, the bedrock consists of semi-conso~lidated, Tertiary,
sedimentary rocks {15) and volcanics· of the Triassic age (Figure
6.5). These Triassic volcanics consist of metabasalt flows with
minor thin interbeds ~f metachert, argillite, metavolcaniclastic
rocks and marble (21). From just upstream of Watana Creek to Jay
Creek, the roctcunit consists of a metavolcanogenic sequ~nce
dominantly composed of metamorphosed flows and tuffs of basaltic to
andesitic comoosition. From Jay Creak to just downstream of t.he
Oshetna River, the reservoir is under.lain by a metamorphic terrain
of amphibolite and minor amounts of greenchist arid foliated diorite.
To the east of the Oshetna River, glacial deposits predominate.
The main structural feature of the Watana Reservoir is a thrust
which trends northeast-so~Jthwest and is ~nown as the Ta 1 keetna
Thrust ( 4).. This thrust fault crosses t11e Susitna River approxi-
mately eight miles upstream of the Watana dam site. The dip of this
fault~,s··uncertain as Csejtey and others (4) have interpreted it to
have a southeast dip, while Tur,,er and Smith (17) suggest a nothwest
dip. To date, there is m'l .. .:ev-'Ujef1Ce for recent displacement a.long
this fault. At the southwest end of the fault, unfaulted T~rtiary
volcanics overlie the fault (4). Evidence of possible faulting has
been observed in the sedimentary and volcanic rock of Jurassic age,
north of Watana Creek (4, 17). Investigations of the Tertiary sedi-
ments in Watana Creek, by members of the University of Alaska Geo-
logy Department, however, did not uncover any direct evidence of
faulting.
Additional work on the reservoir geology is planned for the 1981
progr.am ..
0
6-11
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6. 2 -Devi 1 Canyon
(a) General
This section discusses the overburden and geologic conditiorr: ai: the Devil
Canyon site as investigated by the 1980 progran and earlier explorars.
(b) · Ovf£rburden Conditions
The Devil Canyon has near vertical walls which are generally covered by a
thin veneer of overburden. The overburden varies from a few inches to
_several feet ir thickness (Figure 6~10) v ·The overburden consists primarily
of ta 1 us on or at the base of the near vertical valley wa 11 s. On :he flat
upland areas above 1,500 feet, the slopes are covered by g1 aci a1 ti 11 that
varies from 5 to 35 feet thick. An overburden ·isopach map constructed from
seismic survey and boring data is shown on Figure 6 .11. On the 1 eft abut-
ment (south), there is a topographic depression paralleling the elongated
lakes in this region. The ·overburden in this area reaches a depth of more
than 85 feet and cons~sts princi_pally of glacial till material. A terrace
or·point bar deposit is located approximately 900 feet upstream of the pro-
posed dam axis at the confluence of the Susitna River and Cheechako Creek..
The thi~ckness of alluvial material approaches3SO·feet (Fi:gure6.ll).
Overburden along this point bar thickens rapidly from 100 feet to greater
than 300 feet over a distance of less than 400 feet. This st~ep dropoff in
bedrock was identified in previous studies and will be further investigated
during the 1981 progr~.
( c) Bedrock._ Geq_l29l
(i) ~itholo9l
The bedrock at the Dev i 1 Canyon dam site primari 1 y consists of a se-
quence of a'rgill ite cf Cretageous age. The argi 11 ite is well expos-
ed along the c?:.nyon walls and in scattered outc!"ops throughout the
area (Figure 6.12). It is a dark gray to char-coal gray, fine grt:}J~"'
ed argi 11 ite which is phyl1 itic in places due to iow grade metamo.~~·-·
phism. The argillite is chiefly composed of grain~ of quartz and
biotite with pyrite as an accessory,, The argi11ite weathers to a
medit.m gray color. A light to medium gray, fine grained matrix with
coa•'lse sand graywacke is interstratified in the argillite sequence ..
Syndepositional flow structuves are evident within the rock core
where coarse graywacke particles have been incorporated within a
s~ale matrix. The argil"lite is thinly bedded, homog~neous~ hardi
blocky and competent.. It contains numerous quartz stringers and
veins and aplitic dikes. The apl itic dikes are. composed of a white,
fine grained siliceous material. Differential weathering of the
dik~s haS) produced notches or gu11 ies a long <.Jthe canypn walls.
~1orite was encountered in BH-2 ( Fi gores 6.10 and 6 .13) at a depth
of approximate 1 y 640 feet.. This materia 1 was probab 1y intruded at
the same time as the diorite pluton at the Watana site.. The extent
ef the intrusion beneath the Devil Canyon site has not been
cte11neated.
6-12
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(ii} Bedrock Structure
The thinly bedded argillite unit at the dam s'itehas a strike which
varies from 53• to 70• (subparallel to the river) and dips from 50"
to ao·sE f;Figure 6, 12). The dip of the str.ata ha$ result·ed in over-
·hanging c'iiffs on the south aP.utment; and in some places, cliff
faces parallel to bedding, have formed on the nor-th abutment.
The steep gouge in the area of the dam site appears to be controlled
b,y. the bedding resulting in steeper slopes (60°) on the north abut-
m~n": than the south (45·).
A detailed joint survey was performed ~t 3 stations near the site
(OCJ .... l~ OCJ-2~ DCJ-3), (Figure 6.10). A density Co!1tour plot of
these joints is shown in Figures 6.14 (a-c).. The survey showed one
major· and two minor sets in the dan site area. The strike of the
major set varies from 320• to 350° (approximately NW) and dips an
average of as·NE~ The joint spacing associated w·lth this sat is
generally 3 inches to 3 fe~.. On the left abutment~ some of these
joints show as much as 6 inches ·of opening at the surface; however!)
the extent of the vertical openness is unknown. One of the minor
sets. strikes from 70° to 105° and dips 15° t:> the south .. Another
set strikes in a similar direction from 60" to go• with dips ranging
from subhorizonta1 to 65° northwest.
Additional survey mapping will .be performed to more accurately de-
fine the joint sots.
Several open fractures can be traced along the upper surfac~ of the
abutment from near the proposed dan axis to some 1,600 feet down-
stream and extend 100 feet back from the cliff edge. These frac-
tures are open as much as several feet. In Table 6.2, the orienta-
tion of the Jpen joiii~S are listede Two of the open f-racture orien-
tations correlate with a major and one of the minor joint sets... No
open fr-actures have b·"'en delineated in mapping the north abutment,
as joints are generally tight.
Joint spacing in the borings is moderately cioseto wide and ranges
from less than one to 10 feet with spacing and tightness increasing
with depth. Iron staining is common along the joint surfaces er.nd
numerous calcite "healed'' joints were also encountered.
Several closely fractured or shea~ zones have been mapped along the
canyon ·walls and in the dri11 holes ,(Figure 6.12 and Appendix B-3).
In general. these zones are character-ized by highly fractured and
crushed roci<~ moderate to high weathering depending on location,
c 1 ay gouge_, higher . permeab i 1 ity and core 1 ass during dri 11~ ~g. With
depth, these zones become consideFably narrower, tighter and :further
spaced. The trend o.f these zones is approximatel.'l northwest .... ,
southeast correspond:ing to the major joint set. The 1981 program
will be to delineate these zones in more detail. These zones·are
6-13
(d)
(e)
(f)
,.-·-,
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marked by highly fractured and .sheared rock with clay gouge. Of the
3 holes drillad, the poorest quality ·rock was encountr-.-ed in BH-4
{Table 6 .. 3), which was drilled beneath the pond on the ·south abut-
ment for the purpnGe of determining the existence of a shear zone in
that area. J.\1 thoilsh the quality of ths rock tn this ho1 e was not as
high as the other holes, no evid~nce could be found in the boring
for any major shearing. Additional drilling will, however, be re·"'
quired in this area to insure that shearing was not responsible for
·forming the topographic depression.
(iii) Rock Permeability
The pertrulabi.l ity valves computed from the water pressure tests show
relatively 1ow ··penneabilities on the order of lo-4 to lo-6 ·
cmlsec (Appendix 8-2). In most eases, the zones of higher permea-
bi 1 ity carrel ate wi;th the upper weathered zones and the more frac-
tured· zones at depth. Examination of ·the tests performed in BH-4.
showed minimal water losses in more highly fractured zone. showi!;g
the overall tightnes~ of the rock mass.
Groundwater
Groundwater migration is restricted to joints and .·fractures within the
rock. As described in Section 5, several piezometers have been insta.l.led
to define the site groundwater regime.. Data collected thus far at the· site
has been insufficient to accurately define the groundwater· conditions; how-
ever, it is ass.urned that the 9roundwater 1eve1 is a subdued rep1 ica of the
surface topography with the gradients being towards the river and ponds.
Permafrost.
Preliminary temperature measurements made in the borings showed no perma-
frost. co~ditions on either of the abutments. Additional monitoring of the·
instrument.ation wi 11 be carried out throughout the project to accurately
define a temperature profile.
Borrow Areas
' .
The 1980 investigations at the Devil Canyon site were designed to confirm
the concrete aggregate source near Cheechako Creek previously fdentified by
the WPRS. As .we 11 reconnai ssanee mapping ·of the surrounding area was con-
ducted to identify s.ources of impervious mate~i~ls for the: cofferdan and
the saddle dam.
'··
( i } Concr:ete . Aggresate
0
The previous investiga~.ions had identified the alluvial fan near the
Cheechako Cre~!( confluence approximately ltOOO feet upstream of the
propossd dam. ~"liowever, due. to limitations an accessibility at the
site ·iJnly t·wo auger holes were dri:lled during this investigation.
6•14
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These holes~ located in the western side of the fan~ were drilled to
depths of 11 and 23 \Feet respectively. Data .f~om these ho.les
indicate a tnin mantl~ of organic material overlies three to fqur
feet of silty sand. Be low the sand is a 1 ayer of sandy grave 1 riith·
a trace qf silt and scattered boulders and cobbles that. hinder the
dri 11 ing progress. Sei srnic lines· run by Shannon & Wi 1 son for the
COE (1:4, 18) indicate that this layer is as much as 80 feet thick,
exten ·, lg to approximately elevatton 870 feet~
·Results· of the 1 aboratory testing conducted by WPRS (19) indicate·
that the· material fran this fan is of adequate quality for use as
concrete aggregate. The gravel particles are stream worn and
general Ty. rounded, with the accompanying subangul ar . sands. .
Petrographic analyses of the sar1d and grave 1 indicates that the fan
composition includes quartz diorite>, granites, andesites, diorites,
dacites, metavolcanic rocks, aplites, breccias, schists, phy11ites$
argillites, and. amphibolites .. Generally the material is of good
quality !AJith less than 2 percent deleteriau~; ·constituants such as
chert, muscovite, and o: 'Jillite. The particles are generally fresh
with only 13 percent o1 the material tested showing deterioration or
weathering effects.
}I
From the te!,;ts cor~qucted to date, there appears to be a deficiency
of 3/4 to l•l/2 inch gravel. Howeve~ this could be accommodated by
the se 1 ecti ~e procf)ss·i ng of 1 oca 1 mcra'i na l materials.
( i i} Impervious-Mat~?i a 1
Recnnnaissance mapping of the areas adjacent to the canyon by-this
and previous h;:·y~est.igations ~as-shown that the area is mantled with
outwash .and ti'Il materials several feet thick. In addition~ the
buried channel area on the south abutment is filled with some 90
feet of glacial ma'teri al.. This materi a1 was des tribed during the
f:ield programs as generally dense, well graded and composed 1f
parti~les ranging in size from rock flour to boulders. This
material may provide a source of impervious fill but will require
screening and blending to produce a satisfactory product.
(iii) Add it i ana 1 Materia 1 Sour~e
. -~ ·-
Two terraces have been mapped on the east side of Cheechako Creek
(Figure 5.,4} southeast of the pro,msed d,an axis. The gravel in
these terraces is coarser than in the alluvial fan; but may provide
additiona.l granular material after processing. ·
(g} Reservoir Geology
The containment area of the Devil Canyon Reservoir will be ~onfined to the
narrO~'! canyon of the Susttna River (Figure 6.5). The topography in and
around ls bedro.ck controlled with only thin to n.on-existent overburden·
except at the upper-reaches ·Of the ~.reservoir where all Wli a l deposits cover
the valley floor•.. -
6-15
The large intrusive plutonic body, which underlies the Watana site (see
Section 6.1) also extends over adjacent slopes (Figure 6.5), It is pre-
dominantly a biotite granodiorite with localized areas of quartz diorite
and diorite. It is an off~white to pink 1 ight gray ge_nera11y medium
grained ror.k composed of quartz, feldspar, biot·Tte and hornblende.. The ·
most conmon mafic mineral is. biotite. When weathered, the rock has a 1 ight
yellow gray or pink yellow gray color except where it is highly oxidized
and, therefore, iron stained. The granodiorite is .. gcn~ri11y massive, comp-
etent, and hard with the exception of the rock exposed on the upland north
of the Susitna River where the biotite granodiorite has been badly decorp-
posed as a result of physicaJ weathering.
,.
The other principal rock type in the reservoi~ area is· the argillite and
graywacka!t which is ~~posed at the Devil Canyon dam site. ~n summary, the
argillite has been intruded by the massive granodiorite and· as a result,
large isolated roof pendantt of the argillite and gra,ywacke are found .
locally throughout the reservOir and surrounding areas. The argillite/
graywacke varies to a phyllite of low metamorphic regime.
·The rock has been isoc1ina11y folded into. steeply, dipping structures which
generally strike northeast-southwest.. The contact between the argi 11 ite
and the biotite granodi\>rite crosses the Susi ..:;~a River just upstre~ of the
Oev i 1 Canyon dam site'. It is non-conformab 1 e and characterized by an a l·
most aphanitic texture with an ·apparent wide chilled zone. The trend of
the contaC't is roughly northeast-. southwest as it cros_sas the river.. Sev-
eral large outcrop areas of the argi 11 ite which are completely surraunded
by the biotite granodiorite are located in the Devil Creek area (see Figure
6.12). .
Preliminary joint meas.uY"ements made in the reservoir area indicate struc-
tural trends similar to those encountered at the .dan site (Table 6~2} 1
Joint spacing at these stations ranged up to 3.0 feet.
. 5-16 .
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BOREHOlE
NUMBER
BH-2
BH-6
BH-8
. \
-- - -.. - - ---~-··, -
lABlE 6.1
~T"~~ ' BOREHOLE ROCK QUALITY DISTRIBUTION
PERCENTAG£ OF REGOVERED CORE IN SPECIFIC RQD kANGES
. 90-95i 0-25% 25-50% 50 ... 75% 75-90%
19 15 22 17 13
5 2 13 22 15
4 7 18 16 18
ROCK QUAliTY ClASSlFICATIO~~ (MODIFIED FROM OEERE, 1963)
0-25%
25-50%
50-75%
75-90%
90-95%
911-100%
Very Poor
Poor
fair
Good
Very Good·
·Excellent
95-lOOl
14
43
39
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Joints, Major·
Joints, Major
Joints, Minor
Fractures, Open
TABLE 6 •. 2
DEVIL CANYON
.QB. ..... I E;.;..;,N.;.,;.TA.;.;.T..-10.-..;.. N.;...,.,;;;.;QF~. _o.;;.;I S;;.;;;C~ON;.;.;T...;;;.I.;.;.;NU;;.;;;I;.;..T~I E;.;;;.S
STRIKE .
(AVERAGE)
(
320~ to 350° r~~s·)
10• to 105° (83°)
60° to 90° (79•)
300ti to 338° 2e 0 to ss·
7Sc. to 100°
135° to 140°
. Note: Joint stereonets are shown on Figures 6.14, a to c.
·s-la
DIP
(AVERAGE)
78°NE to 77 12 SW
0 to 35°S
55° to 75°St
87°SW to 7 4°NE
68°SE to 82oW
43°SE to as·sE
Vertical
--··-----------... ---~--
BOREHOLE
NUMBER
-.~~-
81-f ·1
BH-2
BH-4
TABLE 6 .. 3
DE~Il CANYON BOREHOLE ROCK QUAliTY DISTRIBUTION
0-25%
PERCENTAGE Of RECOVERED CORE IN SPECIFIC RQD RANGES
25-~0% 50-75% 75-90% 90-95i . 95-100%
2 2 9 21 15
.... 1 7 14 20 .j
1 8 16 22 16
ROCK QUALITY CLASSIFICATION (MODIFIED FROM DEERE, 1963)
0-25%
25-50%
50-75%
75-90%
90-95%
95-100%
Very Poor
Poor
Fair
Good
Very Good
Excellent
51
55
37
·~I
I
I
. . .
~ ...,-·-~. r '
• •• '! •
' . . ..
\" '·,)·,· ... . " ~·;
;,__~~......:..-~;,_-----_;_...,;...:..,L__,:.2..:,..;;;..,.. ____ ,;_,_ ______ ..::;: ..... _........,.. ________________ ~ ___ __, _______ __.; __________ ....,___,~----......,_----....-...;;.--~-........ -......_ ______ , ---~.,....;..__..........., __ ....., ~-::---.-'!,
REf: U.S. ARMY CORPS OF ENGINEERS
SUPPLEMENTAL. FE.AS!BIUTY
REPORT 1979.
II 'fP
•AP
•DH
•DR
•BH
•AH
LEGE NO
TEST PIT
AUGER HOLE. __ j· CORP OF rNGINEERS 1978 CORE DRILL HOl..E "" · · · '
ROTARY DRILL HOt..E_r
BOREHOLE
AUGER HOLE
SEISMIC LINE :
l Stiiv\ME.N: &980 PROGRAM
DM,SW-CORP OF ENGINEERS. 1976
SL-SUMMt:R 1980 PROGRAM t-
El CROSS SECTIONS
~WJ LOCATION OF vOINT MEASUREMENTS
.,
' '··
\
\_
~
\ < . '>r~~ __/! '"'---..c.~ .........
WATANA l ... OCATlON EXPLORAT!l)N ~1AP
m
I
~
Q
NOTE:
API7 •
I) SECTION SHOWN ·ON fiGURE s..; ·
2) TOPOGRAPHtC: CONTouRS AP.£
APPROXIMATE
I l
i
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FIGURE 6.1
.
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.··I
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;,.ji. I
I
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~::
.. ,.,·'
LEGEND
DATA POINTS
• DRILL HOLE
.:l SEISMIC 1J'NE STATION
" ---DEPTH TO BEDROCK CONTOUR APPROXIMATE
...,. BURIED CHANNEL THALWEG
Q ~AJOR BEDROCK OUTCROPS
REF. U.S. ARMY CORPS OF ENGINEERS
SUPPL..EMENTAL FEASlBIUTY REPORT 1979.
NOTE:
TOPOGRAPHIC CONTOt.fiRS ARE
APPROXIMATE 0
CONTOUR INTEFIVAL: 100 FE:El'
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6-21 ·.ISOPACH MAP OF OVERBURDEN-WATANt. FIGURE s2 . ~~r: ·L---~--------------------~----~~-------~----------~------------~~----~~~-----==~~~:~~~-------~--~~~~~~
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--........
--..... -
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-
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'.......... "'\
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/' ·---. --.. -
0 ~-··-.---.--
GEOLOGlC ~~AP OF WATANA
-·-;: ~--
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1..• •
--
.<-#
---
--
-,
., ... ..
' ;_.
..
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..
"'LEGEJ.:>
~ 'VtX..CAh'X:LASllC SEDC.~=:J.'TS. n~~'::
e3 TUFFACEOI rs S!J"S'T{lr-.35 A:::J SA:O::,.-n:t:!S
~ PORPOORITIC ANDESITE, u;:;u.:o;. ~· ~to
~~ BASAIJ', DfDTE, N;:) ~U!.
PIORITE. I10..lDtNG QUARTZ [llloQR(t'E :AJ~
GRAHOOK>RITE
0 ()(Jlt;ROP
--r-STRIKE AND DIP OF BEDC:KiWG
---STRKE AfiD DIP OF ~ITS
~ SHEAR AND fRACT1J'F.E ZotS. SHEB:li':3.
~01?
~-CONTt....'l. ~
NOTES:
I) FIElD loe.APPi:;:i UNOERn..~ AT A SC.~l.F.
W 1!6,000 (AERtAL~~
y;t
FIGURE 6.3
. . ..
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.;. I
"-
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... .I.
~I
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~500
2000
~
'"' ... ...
1501)
1000
DH-H
BOTTO¥ .IS(f DIS
MOO£RAT£LY
F~TUREt'
ZOllE
::<-U:>!.!T TO iotO:>ERATEl..Y
-~~ ZOSE -
I f::~
BH-a
. B::Tt::l!JS 200' UIS
NORTH ABUTMENT SOUTH ABUTMENT
BOTTON :SOO' U/S
'}
6-23.
'IUvtR'S
EOGt
DH-21 E~T .. '\1 ~s.::· QIS
I'!OTTOM 7:::' 0 'S
SECTION A-A
LOOKING U/S N 15" W
ALI .. UVlUI,l
SECTION B-B
LOOKING U/S N .;o• W
RtrE:'I!:h::ts I i:OIU> 01" E~lGll'iE~"'S,
19:71! 1'\.t:rr t>·'
~ SUI,II!l!;ri '19$0 ~~~~
__.....-"""'" 8' GLACIAL TILL
BH-8
ANDES ITt
'oiOI!ITE CONTl.:.T
MODER~TELY FRACluq[~
D!O!liTE • GRANO:)'. 'II'Tt
BOTTOM 175' U/S
GEOLOGlC CROSS SECTIONS -.WATANA
..
LEGEND
~ RIVER ALLUVIUM
t:::.:] GLACIAL TILL
a SHEAR AND FRACTURE ZONES
D ROCK
NOTES~
I) VERTICAL AND HORIZONTAL SCALE 1: I
2) SECTION LINE SHOWN ON F~ 6.l
200 lOt'. 0 2CO pw;;ww;;;
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FIGURE 64~ · ~ ..... :
·.1
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{
\
REFERENCE: USGS, TALICEtTNA MOUNTAINS ( 0·4) AND ( D-5}
781 'Kao
\
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"'-. "-, \ -\ (
--64
GEOL.OGIC MAP OF liEVlL CANYON RESERVOIR
Tbgd
66
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T!:IJSENA CREE/': \
·"'· \.
1
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LEGEND.
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; Tv f ANOt::StT.E ANO:.A.'\"DESITlC BAS!.~:.. f
...___ FLDWS, VOLCAN!G 'CLASTIC sal!MB ... J.S
I Tbgd I BIOTITE GRAN~TEl QUARtL
DIORITE:, DfORl'TE: · .
1 Koo 1 ARGIWTE
.f ~ STRIKE AND Ol?''t)f BEDS 1 I
!).. STRIKE AND Dl~ 'OF JOINTS ·-· J _,
----CONTACT, lOCAT~ APPROXI,..ATEUO I
NOTE:
ll GEC.OGJC MAPPlNG U~'Ot;.~tAKEN AT A
SCALE OF I: 12,000 B l~63,560
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STATION WJ-!
El.EV. 14701
n: a&
CONTOUR lNTERVAL. IS PER I o/o OF AREA
180°
s
JOINT STEREO PLOT$ -WATANA
. r-i
F'lGURE 6.60 1111·]
f I .
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-~------~----------------~---------------------------~~---~
(l(
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STATION W1-2
EL.EV. 1470 1
n= 60
CONTOUR IN\~RVAl. IS PER lo/o OF AREA
.,__ J01NT STER£0 P!.;.JTS -WATANA FIGUR!l: 6.6b, [i].
·-~~--~~------~--~~~~~~~~---~ ~ ..
6-26
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I ,,
STATtON WJ-3
ELEV. 14101
n: eo
CONlOUR I NT.ERVAl. lS PER 1·0/o OF AREA
JOINT STEREO· PLOTS .. WATANA
-.
-27
FlGURE-S.Sc [il
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STATION WJ·4
ELEV. 1750'
n:IOO
CONTOUR INT£\WAl. IS PER 1°/o JF AREA
l
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JOINT S rEREO PLOTS ~. WATANA FIGURE6.6d. [jl
(}
"' j
i -·
(,
~;
\ ~~ v
WATANA DAMSJTE
POTENTIAL BORRO'A' AREAS
~ <·
\
~ PRES. ErnLY lDENT~FIE: ~ AR=:;,
~ PROPOSED NEW ~fi~~
~ FOR INVESTlGATJO;~
0 .5
. -SCALE IN MILES
! • •
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SEV.::.R:l L~O:t.H: T3ZPt, Rl!':, S32 A.'O 33
6·--32. DEVIL CANYON LOCATION EXPLORATION f,~AP
LEGEND
-• en
e BH
• if; S, TEST PITS Af-!D TREf.:C:HES "~" BUREAU OF REClAMA1lm.;, lS.OO
. o AUGER HOLES-St.JMME.R aso PROG~!.
SW SEISMIC LINES-
r-.......... """4i CORP OF ENG~t:EERS. l91'8
SL SEISMIC ll.NES•
t SUMMER ISSG ~OGRA.M
e DCJ lOCATION OF ~1NT MEASUR.a!Ef\'1' t i' CROSS SECUQN.
zoo o ~ ctt> ~ &-r r .t. ~----:::"-:::::.... ---:--:..·. ---~-
.s::.ttE ~"' 1'£!1'
~· t•TER'.:.t. !lO FEET
ll!!SHEli CXJt.'lUR ·~ FEET
·I
;_ 'I
f!E~Neet USGS, TALKEETNA MO!_,,'l't.l'S (O~!i}, ALJ..:.r<A OUAORA!'G..£,
SE.....:ARO MERIDll.N T32N, RlE, 5~2 l.'~'.J :33
lSO'PACH MAP OF OVERBURDEN-
DEVIL CANYON
LEGEND
DATA POINT~
• DRILL HOLE .
.6 SEISMIC LINE S~TlON
----DEPTH TO BEDR~ CONTOUR
APPROXIMATE G MAJOR BEDROCK ~'iTCROPS
NOTE:
1) CONTOURS HA\lE 'BEEN ADJUS"i:E:
TO TOPOGRA.Pl:n~
2} TOPOGRAPH~ CONTOORS A'.:..:.
APPROXlh'J'.T~
2!10 0 2'"-h
&"5J51l>Gd
CONTOUR tti£R~ :!!b fE:ET
DASHED COtnt>UR ~ ;fE1'
FIGURE U.ll
. ,..t.l"' !"'. . "~ . '
. $:..,;:~-~
~
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1
;
. '
I .
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fB)
~r~r
LEGEND
@ MAJOR OUTCROPS Ot=' .ARGILLITE ~;-;
.>:-STRlKE AND DIP OF BEDS
. ..,._ · STRIKE AND DIP ·Cf"' JOINTS
..J"-STRIKE AND I:XP OF OPEN JOir-«S
~.SHEAR AND FRACTlit ZONES
NOtE:
l
t
i
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I) GEOLOGIC MAPPlt~G Ur.'DErt1:A.l.$r-; }:' ·
AI THE SCALE OF .f;24,0CC !
REI'ERE~• USGS, TALXEE:TNA MCXM~ ([)•!)), ALASKA OUAOiW¥.>LE,
SEw:.RO .I.!E:RIOIA.'i: T~N, RtE, S3Z AN0.33.
S 32. S3l
(AERIAL PHOnlGRAPHS)
2} TOPOGRAPHIC C0t-.'10URS ARE
APPROXIMATE
z.tO 0 20" . 4100 k: ""5""S& I
~ ·flroN:t. ·!liD FEET
.DASHEO (XWTOlB 25 n>::.!
• I
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l
t
,...._........_!
' ll p--.. !
.. ~~.... · · ·· u"~ ; ~
-FIGURE S 12 . lw ... :&. • t L..------------------------:6;:""--:3::;-;z~,: ----,.........;.-.____. .......... ____ _,;, ___ __.... _________________ "-------------.;..._,._~--------....... ---_,..,..;.._..........,.........,;.....,;:;.:,....;...-· ---------~~:.:..:::~:....:::~::::;:=:::::...:
GEOLOGIC MAP .QF DEVIL CANYON
I
~--__ .•. '
..
r Lf
~·-·
-I
r.
·I
I
I\
I
1400
1300
1~00
700
600
500
NOI\td ABUTMENT
SH-2
PROJ:':CTEo ZOO' DIS
LOOKING U/S N II"' E
5>H"'l (PROJECTED)
BH.-4
BOTTO~ 250' 0/S
SOUTH ABUTMENT '·
1 e-.:;:;s::.:J -~-.Rt':s..~v!--!)li.., t~s~
2 CO"'"S 'OF EN:O,,t:S:~'S, l$7!
3 5.;\ll.":;:::t 19!:! '"'""~·~":.::•.
LEG!i~
D GLACIAL TILL OR 0YER6tiR~t:
0ROCK
a SHEAR AND FRACTURE 20t-.,'$
BcoNTACT
NOTES
1) VERTICAL AND HORIZm.ZTAL. S~t.E l: I
2} SECTlON LINE . SHOWN ON FtG'..F.Z 6.10
100~ ().
5il-:~ tOO t::.:! •:.:
SCI.LE Ill fU:T
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; _: •.
· ..
0
STAT10N OCJ-1
a..EV. 9001
n: 93
180°
s
CONTOUR INTERVAL IS PER I 0/o OF AREA
0 JOINT STEREO PLOTS-DEVtL CANYON ~~··~-~
F1GURE 6.14 a. . [I . ..
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STATlQN OCJ-2
El.EV. 900'
n ~ 100
0
Q
CONTOUR INTERVAto.JS PER lo/0 OF AREA
N
oo
I -I
JOINT STEREO PLOTS· DEVIL CANYON [j1·111
FIGURE 6.!4 b .
I
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I
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I.
I
I
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I
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I
STATtON OCJ·3
• EL.EV. . 1400'-teed
n: 100
CONTOUR INTERVAL IS P'ER 1°/0 OF AREA
JOINT STEREO PLOTS .. DEVIL CANYON
6-38
F1GURE 6.l4c lil
I
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I . .
I
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I
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I
I
REFERENCES
,,
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I
~-·
I
LIST OF REFERENCES
1. Billings, M. P. Structural Geology: ·Prentice-Hall Inc~ New Jersey.· p 606.
1962.
2. Csejtey,: B., Jr. '!Tectonic Implications of a Late Paleozoic Volcanic Arc in
the Talkeetna Mountains') Southcentral Alaskan, Geology. Vol 4, No. 1.
pp 49 -52. 1976.
3. Csejtey, B. Jr. ••The Denali Fault of Southern Alaska: The Case for Minor
Rather than Major· Displacement'-, Transactions American Geophysical Union.
Vol 61, No. 46. p 1114. ·
4. Csejtey, I:S. Jr., H. L .. Foster and W. J. Noklegerg ... Cretaceous Accretion of
the Talkeetna Superterrane and Subsequent Development of the Denali Fault
in Southcentral and Eastern Alaska", Geological Society of America,
Abstract with Program!_. p 409. 1980. ·
0
5. Csejtey, B., Jr., W. H. Nelson, D. L. Jones, N. J. Silberling, R. M. Dean,
M. S. Morris, M. A .. Lam.phere, J. G. Smith and M. L~ Silberman.
"Reconnais~.ance Geologic Map and Geochronology, Talkeetna Mountain
Quadrangle, Nol"thern Part of Anchorage. Quadrangle, and Southwest Car·ner of
Healy Quadrangle·t Alaska", U.S~ Geological Survey Open File Report
78-558A. p 60.
6. Dames and Moore .. SubsUrface Geophysical Exploration~ Proposed Watana
Oamsite on the Susitna River, Alaska. p 2.2. 1975 ..
7. Detterman, R. L., G. P'lafker, T. Hudson, R. G. Tysdal and N. Pavoni.
18 Surface Geology & Holocene Breaks Along the Susitna Segment of the Castle
Mountain Fault~ Alaskau, U.S. Geological Survey MF-618. 1974.
8. Gedney, L. and Shapiro, L. Structural Lineaments, Seismicity and Geologx of
the Talkeetna Mountains Area, Alaska. U.S. Army Corps of Engineers.
19-75.
9. Jones, D. L., N .. J. Silberling, B. Csejtey Jr., w. H. Nel~nn and C. 0.
Bloome. "Age and Structural Significance of the Chulitna Ophiolite and
Adjoining Rocks, Soutneentral Alaska", u.s. Geological Survex,
Professional Paper 1121-A. p 21. 1978.
10. Kachadoori an, R. 11 Geo logy of the Devi 1 Canyon Dams i te, A 1 ask an, U.S,
Geological Surveys Open File Report 74-40. p 17. 1974.
11. Karlstrom, T. N. V. 11 Quaternary Geology of the Kenai Lowland and Glacial
History of the Cook Inlet Region, A1aska11 , U.S. Geological Survey,
fr.gfessional Paper 443. p 69. 1964. · · · · =
12. Pewe, T. L. "Quaternary Geology of Alaska11, lJ~S. Geological Survey,
Professional Paper 83~. p 145. 1975.
61
!
13. Richter 3 0 .. H. and D.. L. Jones. .. Structures and Stratigraphy of Eastern
Alaska Range, Alaska", American Associ at ion of Petro1eu1;1 Geologists~
Memoir 19 ~ pp 408 -420.. 1973 .. · · ·
14. Shannon and Wilson. Seismic Refraction ·Surve , Susitna H droelectric
Project,. Watana and Dev1 anyon Dam 1te. 918.
15. Smith, T. C.. 11Regional Geology of the Susitna -Maclaren River Area11
·,
Alaska Division of Geological and Geophysical Survey, Annual ReR~·
pp 3 -6.. 1974. . . .
16. Smith, T. E., T. K. Bundtzen and T. C. Trible. "Stratabound Copper-Gold
Occurrence, Northern Talkeetna Mountains .. , Alaska Division of Geological
and Geophysical Survey Open File Report 72. p ll. 1975.
17. Turner, D. L. and T. E ... Smith. 11 Geochronology a.nd Generalized Geology of
the Central A1 ask a Range, Clearwater· Mountai-ns, and Northern Talkeetna
Mountains 11 , Alaska Division of Geological and Geophysical Survey Open File
Report 72. p 11. 1974. -
18. U.S .. Army Corps of Engineers. Up~r SusitYlci River Basin, Alaska,
Hydroelectric Power Supplemental Feasibility Report. 1979.
19. U.S .. Bureau of Reclamation. En ineerin ~~~~~~~~~~~~~--~~._~~ ·Devil Canyon Dam~ Devil Canyon Project ..
1960.. '
20. Woodward-Clyde Consultants .. Final Report .. Susitn_!Hydroelectric ProJect
Seismic Refraction Sury~. l980. ·
21. Woodward-Clyde Consultants. Interim Repor't on Seismic Studies for Susitna
Hydroelectric Project.. 1980 ..
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\•
APPENDIX A
SUMMARY OF PREVIOUS WORK
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I
I
SELECTED BIBLIOGRAPHY ·
Ala·ska Division Geologic and Geophysical Surveys. 11 Regiona1 Geology of the
Susitna -MacLaren River, Area", Annual Report. 1973 ..
~nderson, R.E. 11 Preliminary Geochemistry ana Geology, Little Falls Creek Area,
Talkeetna Mountain Quadrangle", Alaska Div1sion Geological and Geophysical
Survey, Geochemical Report 19. 1969. ·
Anderson, R.E. "Geology and Geochemistry, Diana Lakes Area, Western Talkeetna
Mountains", Alaska Division Geological and Geophysical Survey, Report 34 ..
1969. 0
Bei kman, H ~ M. "Pre 1 imi nary Geologic, ·Map of the Southeast Quadrant of
Alaska", U.S., Geological Survey Miscellaneous Field Studies Map MF-612.
1974. ~
Beikman, H. M.~ D. 0. Holloway and E. M. ~1acKerett, Jr. uGenerali.zed
Geologic Map of the Eastern Part of Southern Alaskau, U.S. Geological Survey,_
Open File Map 77~169~8. 1977.
Beikman, H. M .. Preliminary Geologic Map of Alaska. U.S. t;eological Survey (two
sheets), 1978.
Berg,. H .. G., 0. L. Jones and D. H. Richter. nGravina -Nutzotin l)elt -
Tectonic Significance of an Upper Mesozoic Sedimentary and Volcanic Sequence
in Southern and Southeastern Alaskan, U.S. Geological Survey, Professional
Paper 8~. 1972~
Bilello, ·i~. Ae 11 A Winter Environmental Data Survey of the Drainage of the Upper
Susitna River, Alaska"~ CRREL Internal Report 332 (unpublished). 1975 ..
Capps, S. R .. 11 The Southern Alaska. Rangeu, !J..:S. Geological Survey, Bulletin 862.
1935.
,Capps, S. R. 11 Geo1ogy of the Alaska Railroad Region 11 , U.S. Geological Survey
Bulletin 907. 1940. -
Chapir Th1aodore. "The Nelchina-Susitna Reogion, Alaska", U.S. Geologica:
-· Bulletin 668. 1918. ·
» ---·-· ••.
Cl ~ . :... , S .. H. B. Clark and C. C. Hawley. "Significance of Upper
Po.~. ·>.(:ic Oceanic Crust in the Upper Chulitna District., Westcentral Alaska
Rangt:li, U.S .. Geological Surv!!.x;, Profe·ssional Paper aoo ... c.* 1972 ..
Cobb, E. H. uMetallic Mineral Resources Map of the Talkeetna Mountains
Quadrangle, Alaska 11 , U.S. Geological Survey Miscellaneous Field Studie.§.. Map MF
370. 1972. -
Vol 2: Alaska and
~ eport. 5.
Coulter~ H. W., D .. M. Hopkins, T~ N. V. Karlstrom, T. L. Pewe, C .. Wahrhaftig and
·J. R .. Williams. 11 Extent of C:zlaciations in Alaskau, _g .. s. Geological Survey
Miscellaneous Geological Investigation Map I-415. 1965.
Csejtey, B., Jr. 11 Reconnaissance GeologTc Investigations in the Talkeetna
Mountains~ Alaskau, U.S. Geological Survey, Open File Report 74-147. 19.74.
Csejtey, B .. , Jr. 11 Tectonic Imp1icatlons of a Late Paleozoic Volcanic Arc in the
Talkeetna Mountains, Sauthcentral Alaskan, Geolo9y. Vol 4, No.1. 1976.
Csejtey, B .. , Jr., et al. !•Reconnaissance Geolog~c Map and Geochronology,
Talkeetna Mountain Quadrangle, Northern Part of Anchorage Quadrangle, and
Southwest Corner of Healy Quadrangle, Alaskan, U.S .. Geological Survey, Open
File Report 78-558A. 1978.
Csejtey, 8 .. , Jr. 11 The Denali Fault of Southern Alaska: The Case for Minor
Rather than Major Displacement 11 , Transactions American Geophysical Union. Vol
61, No. 46.
Csejtey, B., Jr. and R. J. Miller. Map and table describing metalliferous
and selected non-metalliferous mineral deposits, Talkeetna Mountains
Quadrangle, Al-aska. U.S. Geological Survey, Open-File Report/8•558-8.
1978. ..
Csejtey, B., Jr., W. H. Nelson, 0 .. L. Jones, N.J .. Siberling, ft. M. Dean, M~ S.
M~rris, M. A. Lamphere, J .. G. Smith, and M. L. Silberman. Reconnaissance
Geologic Map and Geochronology, Talkeetna Mountains Quadrange, Northern Part
of Anchorage Quadrangle and Southwest corner of He a 1 y Quadrangle, A 1 ask a.
U.S. Geological Survey. Open File Report 78-558-A~ 1978.
Csejtey, 8., Jr., W. H. Nelson, M. A. Lamphere, and D. L. Turner. Trondhjemite
in the Talkeetna Mountains, Southcentral Alaska. U.S. Geo1ogica1 Surv~y
Professional Paper 1150. 1979.
Csejtey. B., Jr., H. L. Foster, and W. J. Nok.legerg. ''Cretaceous Accretion of
the Talkeetna Superterrane ~nd Subsequent Development of the Denali Fault in
Southcentral and Eastern Alaskan, Geological Society of America.t .. .Sbstract .. 11ith
Programs • 1980.
Dames and Moore~ Inc. Subsurface Geo h Dams i te on th~ Sus i tna ~·~{, ... v-e_r_., ... A~. r-a_s..,.k .. a . ...;...,c--o.-~~---~~~----~-:---'l""""""l'~·
UACW85-76-C-0004 . 1975.
Davies~ J. and E. Berg. 11 Crustal i~1orphology and Plate Tectonics in Southcentral
A1aska 11 , Bulletin of the Seismological Society of America .. Vol 63, No.. 2.
1975.
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I ,.
Detterman, R. L., G. Plafker, T. Hudson, R. G. Tysdal, and N. Pavoni. "Surface
Geology and Holocene Breaks Along the Susitna Segment of the Castle Mountain
Fault, Alaskan, U.S. Geological Survey Miscellaneo,us Field Studies Mae MF-618,
1974.
Detterman, R. L., G. Plafker, and R. G. Tysdal. "Geology and Surface Features
Along Part of the Talkeetna Segment of the Castle Mountain -Caribou Fault
System, Alaska11
1 U.S. Geologica1 Survey Miscellaneous Field Studies Map
MF-738. 1976.
Ekdale, A .. A. "Trace Fossil Evidence for Deep Water Sedimentation in Cretaceous
Arc-trench Gap, Southcentral Alaskau (abs~), American Association of Petroleum
Geologists, Bulletin Vol 63, No.3. 1979.
Ferrians, 0. J., Jr.,. R. Kachadoorian, and G. W. Greene. "Permafrost and
Related Engineering Problems in Alaskan, U.S. Geological Survey Professional
Paper 678. 1969.
Feulner, Alvin J. "Water -kesources Reconnaissance of a Part nf the Matanusl<a
-· Susitna t3orough, AlaskaJ', U.S .. Geological Survey Hydrologic Investigatior~
Atlas No. HA-364. 1971.
Forbes, H. B .. , T. ·E. Smith !I and T. L. Turner. 11 Comr;,'ar~tive Petrology and
Structut'"e of the MacLaren, Ruby Range and Coast Range Be 1 ts: Implications for
Offset Along the Denali Fault Systemu (abs.), Geological Society of America
Cordilleran Section. 1974.
Fuch, W. A. 11 Tertiary Tectonic History of the Castle Mountain -Caribou Fault
System in the Talkeetna Mountajns, Alaska", Geolq,9ical Societx of American,
Abstl'act Programs. Vol 11, No. 7. 1979.
Gatto, L. w .. ~ c. J. Merry, H. L. McKim, and D. E. Lawson. 11 Environmental
Analysis of the Upper Susitna River Basin Usin~g Landsat Imageryn, CRREL Report
80-4. 1980. .
Geaney, c. and L. Shapiro,. gructural Lineaments, Seismicity, ana Geology of
!he Talkeetna Mountains Ar~a, Alaska. Geophysical Institute, University of
A 1 ask a. l975 ..
Gedney, L. and J. 0 .. Van Wormer. 11 Some Aspects of Active Tectoni.sm in Alaska as
seen on ERTS-1 (Earth Resources Technology Sat.ellite-1) Imagery .. , U.S.
National Aeronautic_~ and Space Administration ~,~~cial Publication 327.. 1973 ..
Harris~ N .. B. Late Tertiary Fau1ts in Souths_entt-~J Alaska .. Masters Thesis,
Stanford University. 1977.
Haugen, R .. K., R. L. Tuinstra, and C. w. Slaughter. "A Landsat Data Collection
Plat form at Oevi 1 Canyon Site? Upper Sus itna Hasi n, Alaska", CRREL Spec·; a_l
Reportl9-2, AD A068508 .. 1979.
Jasper, M .. W. 11 Geochemical Investigations Along Highway and Set;ondat'Y Roads in
Southcentral Alaska11 , Alaska Division of Mines and Minerals, t.;eochemical
Report 7. 1966. -. ..
Jones, D. L., N. J. Silberling, B. Csejtey~ Jr., W. H. Nelson and C. D. Blome.
11 Age and Structural Significance of Ophiolite and Adjoining Rocks in the Upper
Chulitna District, Southcentral Alaska", U.S. Geological Survey, Professional
Paper 1121·A. 1980. ·
Kachadoorian, R., D. Hopkins and D. Nichols. "Preliminary Report of Geo.logic
Factors Affecting Highway Construction in the Area Between the Susitna and
Maclaren Rivers~ Alaska", U.S. Geological Survey, Open File Repor•t 54-137.
1954 ..
Kachadooian, R and T. Pewe. "Engineering ueo1ogy of the ~outhern H.alf of the_
Mt.-Hayes A-5 Quandrangle, Alaska", U.S. Geological Survey,. Open File Report
55-78. 1955.
Kachadoorian R. 11 Geology of the lJevil Canyon Damsite, Alaska 11 , U.S. Geo1oaical
Survey, Open File Report 74~40. 1974.
Kachadoorian, R. and H. J. Moore. "Reconnaissance of the Recent Geology of the
Proposed Devil Canyon and Watana Damsites, Susitna River, Alaska", Exhibit
D-2, U.S. Army Corps of Engineers Report. 1978.
Karlson, ~· C., G. C. Curtin, E. F. Codey and L. Gormezy. 11 Geochemica1 Maps of
Selected Elements and Results of Spectrographic Analyses for Heavy Mineral
Concentrates from the Western Half of the Talkeetna Mountains Quadrangle,
Alaska11
, U.S. Geological Survey, Open File Report 77-53Q.. 1977.. ·
Karlstroni, T. N. V. 11 Quaternary Geology of the Kenai Lowlands and Glacial
History of the Cook Inlet Regjon, Alaskau, U.S. Geolog:,cal Survey,
Professional Paper 443. 1964.
Karlstrom, T. N .. V., et al. ~~~·..trficial Geology of Hlaskan, U.S. Geological
Survey, Miscellaneous Geological Investigation ~p I-357. 1964.
Kaufman, M. A. "Geology and Mineral IJeposits of the Denali-MacLaren River
Area11 , A1aska Division Geological and Geophysical Survey, Report 4. 1964.
Krinitzsky, E. L. Earthquake Assessment in the Susitna Project, Alaska. U.S.
Army Waterways Exper1ment Station. 1918.
. -Q
Lahr, J .. C. ar.\} R. Kachadoorian. Preliminary Geologic and Seismic Evalua~i.on of
~be Proposed Dev~_l Canyon and Watana Reservoir Areas, Susitna River, Alaska.
Informal Report to the U .. S ... Army Corps of engineers. 1975.
Lahr-, J. C. p_etai led Seismic Investigation of Pacific -North American Plate
Interaction in Southern Alaska. PhD Dissertation, Columbia University.
1975 ..
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Lathram, E. H. and M. R. Albert. "Significance of Space Image Linears in Alaska.
in Fh-st Internati on a 1 Conference of New Basement Teet on i cs. Proceedings, Salt
Lake City, Utah, 1974 11 , Utah Geological Association, Publication 5.. 1976.
Lathram, E .. H. and R .. G .. H. Reynolds.-"Preliminary Space Image Lineament Maps
of Alaska", U.S. Geological Survey, Open File Report 76-341~ 1976.
•
McGee, D. L. and M"' W. Henning. 11 Reconnaissance Geology--Southcentral Talkeetna
Mountains, Alaska", Alaska L>ivision o .. f Geological and Geophysical Surveys,
Open File Reps>rt 103. 1977~ ·
Miller, J. M .. , A. E. Belen, L. U. Gedney and L. H .. Shapire. 11 A Look at Alaskan
Resources with Lar~dsat Uata 11 ~ International S}111posium on Remote Sensing of the
Environment, Proceedings 10, Vol 2: 1975.
Miller, R. J., E. F. Cooley, R. M. O'Leary, L. Gormezy, B. Csejtey, Jr., T .. E.
Smitn and M. N. Cleveland. 11 Ana1yses of Geochemical Samples from the
Ta.lkeetna ft1ountains Quadrangle, Alaska", U.S .. Geological Survey, Open File
Report 78-1052. 1978.
Miller, R .. J., G. C ... Curtin, and B. Csejtey, Jr. 11 Map Showing Geochemical
O~stribut'ion and Abundance of Selected Elements in Stream Sediments and Heavy
Mineral Concentrates, Talkeetna Mountains Quadrangle, Alaskan, U.~. Geological
Survey, Open File Report 78-§5~E~ F, G, H~ I, J, K, L, M, N, 0. 1978,
Moffit, F .. H. 11 Headwater Regions of Gulkana and Susitna Rivers, Alaskan, U.S.
Geological Survey, Sul let in 498. 1912.
Nelson, S. W. and 8. L. Reed. 11 Surficial Geologic Map o~ the Talkeetna
Quandrangle., Alaska11, U.S .. Geological Survey, Miscellaneous Field Studies
MF-870J. 1978.
Pewe, :r. ~ .. (Ed.). 11 INQUA Conference: Guidebook to Central and Southcentral
Alaska 11 , VII Congress of the International Association for Quaternarx
Research. 1965.
Pewta~ T .. L. 11 Quaternary Geology of Alaska", U.S. Geolog,ical Survev,
Professional Paper 835~ 1975.
Reed~ 8. L. "Oisseminatea Tin Occurrences Near Coal Creek, Talkeetna
Mountains 0-6 Quadrangle, Alaskan, U.S ... Geological Survey, Open File Report
78-77. 978. . . .
Reed, B .. L. and S. W. Nelson. 11 Geologic ~lap of the Talkeetna Quadrangle~
~~~~~au, U.S. Geological Survey, Miscellaneous F1.~1d Studies Map MF-870-A.
Reger, R ... D. 11 Rec.onnaissance Geology of the Ta1keetna-Kashwitna Area, Susitna
River Basin, Alask3.u, ~~laska Division of Geological and Gf;OphysJca1 Surveys"
Open Fi}e Report 107A. 1978.
·,' ,, ~' -· ·. ·.; " ·,· .... -~
(I
Richter, D. H. and D. L. Jones. 11 The Structure and Stratigraphy of Eastern
Alaska Range, Alaska 11 , American Association Petroleum Geologists Memoir 19.
1973.
Richter, D. H. 11 G~ology of the !Jortage Creek -Susitna Kiver Area", Alaska
Division of Geological and Geophysical, Surveys Report 3. 1964.
Richner, D. H. and N. A. Mason, Jr. "Quaternary Faulting in the Eastern Alasrka
Range~', Geolosical Society of America, Bulletin Vol 82. 1971.
·Rieger, S., D. B. Schuephorster anfi C. E. Furbush. "Exploratory Soi1 Survey of
Alaskan, Soil Conser~ation Service Report. 1979.
Rose, A. w.. "Geology of an Area on the Upper Talkeetna River, Talkeetna
Mountains Quadranglen, Alaska Division of.Geological and Geophysical Su.rveys~
Report 32. 1967.
Sayles, F. H. "Procedure for Estimating Borehole Spacing and Thaw-water
Pumping Requirements for Artifically Thawing the Bedrock Permafrost at the
Watana Damsite 11
, U.S. Army Corps of Engineers Report. 1979.
Shannon and Wilson Inc. Seismic Refraction Surve -Susitna H droelectric
Project, Watana and Oevi anyon Damsites_. 9 8.
Silberling, N. J., D. l. Jones~-B. Csejtey, Jr. and W. H. Nelson. '*Interpt'r:tive
Bedrock Geologic. Map of Part of the Upper Chu1itna.District, (Healy A-6)
Alaska", U .. S. Geological Survey, Open File Report 78-545. 1978.
Smith, T. E., T .. K. Bundtzan and T. G. Trible. "Stratabound Copper ... Golo
_Occurrence~ Northel~n Taikeetna Mountains, Alaska", Alaska Division of
Geologica,] and Geophxsical Surveys, Miscellaneous Paper 3.' ·1975. · ·
Smith, T. E. and 0. l. Turner. 11 MacLaren Metamorphic Belt of Central Alaska11 ,
Geological Society of America (abs.), Cordilleran Section Vol 6, No. 3~ 1974.
Smith, T. E. and 1"1. A. Lamphere. 11 Age of the Sedimentation, Plutonism ana
Regional f.letamorphism in the Clearwater Mountains Region of Central Alaska",
Isochron/West 1 No. 2. 1971.
----~-----·~----
Steele, W. C. and J. R. LeCompte. "Map Showing Interpretation of Landsat
Imagery of the Talkeetna Mountains Quadrangle, Alaska", U.S. GeologJcal
Survey, Open File Report 78-558-D. 1978.
Texas Instruments~ 1'Aeria1 Radiometric and Magnetic Reconnaiss:ance Survey of
the Eagle ... Dillingham Area, Alaska", Report GJBX -113-78. 1978.
Turner, D .. L., T. E. Smith and R. B. Forbes. "Geochronology and Offset Along
the Denali Fault System", Abstracts with .er9_grams 70th Annual Meeting;
Cordi11erian Section, Geological Society of _Am~t!ca, Vo1 6, No. 3. 1974.
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Turner, 0. L. and T. E. Smith. 11 ueochronology and Generalized Geology of the
Central Alaska Range, Clearwater lVfountains, ,and Northern Talkeetna f4ountains",
Alaska Division of Geological and Geophysical Surveys, Open File Report 72.
1974. .
U.S. Army Corps of Engineers .. Hydroelectric Power and Related
5
Purposes-
Upper Susitna River Basin, Appendix, Part 1, Section U. 197 and 1978 ..
U.S. Bureau of Reclamation. 11 A Report on the Potential Development of water
Resources in the Susitna River Basin of Alaskan, U.S. Bureau of Reclamation,
Alaska District. 1953.
U.S. Bureau of Reclamation.. 11 Devil Canyon Project, Alaska-Feasibility
Reportu, U .. S. Bureau of Reclamation, Alaska District. 1960 ..
U.S. Bureau of Reclamation. "Engir.e~:-1rtg Geology Report, Feasibility Stage,
Devil Canyon Dam, Devil Canyon Projectn, Alaska Geologic Report 7~ 1960 ..
w.s .. Bureau of Reclamation.. 11 Engineering Geology nf the Vee Canyon Damsite,
Veen Canyon Project Susitna River, Alaska", U.S. Bureau of Reclamation~
Alaska District. 1962.
U.S .. Bureau of Reel am at ion. "Laboratory Tests of Founaat ion Rock Cores from
Devil Canyon Damsite, Devil Canyon Project-Alaska", Concrete Laboratory
Report C-933. 1978.. ·
wahrhaftig, C.. 11 Quaternary Geology of the NenaJ'la River Valley and Adjacent
Parts of the Alaska Range", U .. S .. Geological Survey, Professio_na1 Paper 293-A.
1958 ..
~~ahrhaftig, C. and R. F. I:Hack. 1'Engineering <leology Along eart_pf the
Alaska Railroad 11
, U.S. Geological Survey, Professional Paper 293-B. l95s.
VanWormer, J. D. J .. Davies and LQ Gedney. "Seismicity and Plate Tectonics in
Sou.thcentral Alaska'~')-Bulletin of the SeismoloQical Society of America.,. Vol
64. 1974. -
Yould, E.. 11 The Susitna Hydroelectric Project 11 , Northern Engineering Vol 8, No.
3 -4.. 1976 .
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APPENDIX B
RESULTS OF DIAMOND DRILLING PROGRAM ~ ............. ......__. ............. ..-.....,;;.;,.~........._--
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I APPENDIX B-1
DRILLING REPORTS -R&M
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ACRES AMERICAN INCORPORATED
CONSUL.TlNG ENGINEERS
SU~FALO i NEW YvR-K
---~·~ ~------.-. RAM CCNIIUI.TANTS, INC.. .......... ..,.., ...... : ._. ..... _ .............
ANCHORAGE I AlASKA
ORIL.LING REPCRT
$USITNA HVCIAOELECTI:aiC I=IRCJ.JECT
tor ALASKA POWER tO.UTHCIAITV
HOLE NO. BH-2
SHEETNO. 1 OF 13
SJTE w"'ATANA NOR'l'H ABO'l'MENT JOB NO. P57Ql.OS (ACRES) 052504 (R&M)
,,
CONTRACTOR ... THE DRILL~NG COMPANY STARTED 11:30 p M _ _.J;..;.;u-.lz._. _1-;~4 ___ 19 8 ::::.;:0;:....._
-------------.FINISHED 4:00. p·M: July 27 . t98._o-._
ORIU.lNG
METHOD
LOCATION:
OEPTH
4ft SOl~-· _ .. CASiiiOiiiioiiiiiiN.-G.....,.AiJVAN-.· ~-CE-R--. _____ CASING OIAM. -~-.m ...... _~I-·.-.0.-.. ... -:----
ROCK DIAMOND COR'€ DRl:LL CORE OIAM. NO -3 (1 •. 75~)
LATITUDE N 62° 49 a 33. 28111
DEPARTURE W 148° 33' 9 .151'
BEARING 456
INITIAL DIP -~5=-=s~a~---
OTHER DiPS-------
ROCK TYPE OESCRIPTtON:
-
ELEVATIONS: OAnJM
DRILl. PLATFORM ----~----=<__._._
GROUND SURFACE-~1~8~35~---"""""""'
ROCK SURFACE 1826 • 8
BOTTOM OF HOLE -~i~S.~OG~·-=:5~. ~~~-
WATER TABLE !. 765 (7-28-80)
LENG"ni· •!.
OF CORE. ~HlU . REC.
"'""'' CRQDJ ~----~------------~-------------------------··---------------------P----~--~ 0.0 Overburden Soil matrix containing some green igneous rock,
fine to medium grained with small white crystals.
Grades downward eo residual, highly weathered
bedrock.
0.0 -10.0' No samples taken.
1o .. o· Andesite Greenish to dark bluish-gra" , fine to medium
grained g:roundmass with white plagioclase
phenocrysts. Flow structures. Very hard.. Fresh
to slightly weathered. Joint spacing very close·
to close. Joint and fracture surfaces rough,
with Iron-oxide staining, often thin clay
Run 1 100
·•. r
\
"
LOGGED
BY
1.0.0 (54)
tc
!.5.0
"Run 2 96
1.5 .. 0 (50}
to
20 .. 0 I coatings. Disseminated sulfides throughout.
16.7 Gouge. Core loss 0. 2' .
_Rahaim_. __ • ---H_a_.g_en ____ {R aM)
SUlt!ma.~J by Feldman
----.....--.·-.---.. ...... -.. (ACRES)
<Run 3 100
20 ... 0 (66)
to
.25 ... 0
Run 4 100
25 ... 0 (0)
to
25 .. 5
APPROVED ------·-· --· __ ._., _{R S·M)
DATE
APPROVED --------{ACRES)
DAtE
I
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. '
ACRES AMERICAN INCORPORATED t-------~t'-· ---------..-.·------i
coNSu• "PJNG ENGINE~Rs .... M cc • f.TANT~NC. I '-I -a a -·•rtYe .._........ II ....
BUFFALO , NEW YORK ANCHORAGE ,A~ASKA
CIRILLING AE~CJPIT
8U.ITNA HVI:JACiii!LECTS:.IC PI=ICI.JI!CT
for ALASKA r:taw•~:t AUTHDAITV
HOL.E N0.~-:3-· --
SHEET NO.--l... OF..l.l.
SITE WAT~ NO~':@ aBUTMENT JOB NO. -f.S]Ol. Q5 {ACRES) . 052So;t • {R&M)
OESCRIPTlONa
29. 6 Fracture with clay.
40.5 -60.8 Mafic and ultramafic inclusions.
Calcite coatings common on fracture surfaces.
I.--Off! ·r;;r•" e . REC.
RUN (RQD)
R 5 100
25 .. 5 (42)
to
30 .. 5
· R 6
30.5
35.5
R7
35 .. 5
to
.40'"5
RS
40 .. 5
to
100
{42)
100
(74)
100
(73)
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45.7
R9
4.5 .• 7
i02. I
(92) . J
(55.7 .. 60.8) Core loss 0.7'.
60.8 -71.2 Incompetent~ highly fractured.
fra~tures healed with carbonate.
(62.2) Faint slickensides.
-
Many
to
so .. s
R 10
so .. s
to
SS .. 7
a 11
55.7
to
60 .. 8
a 12
so .. a
to
63 .. 7
R 13
63 .. 7
to
66 .. 9
100
(92)
86
(73)
100
(62~
100
(72)
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..... ,•·=~-~~~~~··~rillillliilliii~ .. ~lllilllilllilli~~~-· .. l
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ACRES AMERICAN INCORPORATED t-------.... ~~...._:.J ·.~ . . . ,., ..
CONSU~TING ENGINEERS lii&M C!!~~~!!t.!~
BUFFALO , NEW YORK. ANCHORAGE , .ALAS~A
I:II=IILLINU AEI=ICiAT
.U.rTNA HVI:»JliCISLIICTAIC PIRC1aJECT Ho r e NO ~H-" . j'-a~ • -~~~~ .... .a--_, .•
for ALABK.#\ I=ICIWl1JI AUTHQAITV SHEET NO • ..,.., ... LOF.ld.
SITE • WATANA NORTH ABUTMENT JOB NO • ., P570l .. OS. (ACRES)""f"'M052S,&4 -{R&M)
~----~------------~-----·-----------------,-----------------·~ Le~ cifE
OF iec-. • ROCK TYP!
'
OESCRGPTION:
71.2 -72..0 Altered. Clay zone.
71.2 -81.0 Highly fractured and sheared,
loss 4. 7' . Highly weathered and altered.
caving, core badly ground dw:ing drill:i..n.g.
loss 5. 3' .
RUN (RQDJ
··,R 14
66;o:9
to
68 .. 9
R 15
68.9
to
71 .. 2
R ~6
71.2
cot'e to.
Hole 72.0
Core
R. 17
72 .. 0
to
75 .. S
i
lOO
(SO}
113
(73/
75
(0)
26.
(0)
R lS 35
75 .. 5 (0}
to
77 .. 5
R 1.9
77'.5
to
'91~0
66
(46)
81. 0 -97. 8 !i:i.ghly fractured through~ut, l R 20
moderately hard to .soft and friable locally, Sl .. o
moderately to slightly Weathered, more \:Olllpetent to
lQQ.
(71)
than rock ab•ove. 84 .. 5
R 21
1
84 .. 5
to
ss.o
100
(0)
R. 22. 100
as.o (77)
to
90.2
~---~~--~--------~·'
I PD.·[~ ~~=L~~~~:~~~~;;oRAT£D r-------~n~~'-._-.-:t-~-~-N-T_!J..!_··~-....... -.----~ I '
IIUDld BUFFALO t NEW YORK ANCHORAGE t ALASKA
.~.~a~R~.~.L~L-I~N~G~.~E~P-.a~. ~R-T~----~.----~------------------~·
HO L.E NO. BH-2 i ;
SHEET NO~· 4 0 F: 1 3 .1 ...
{ACRES) 052504 _(R&M) ~
BU.rTNA HYI:IP:aa.LBCTw:.IC PRC2.JECT
foT ALASKA PICIWI!R AUTHCIPIITY
SITE WATANA NORTH ABUTMENT JOB NO. P570l.. OS
DEPT'H ROCK TYPE
t
i.~ _.:/.t-.,. OF ~
RUN R!C~
(RQDJ
DESCRIPTION•
(92.0 -95.0) Core: loss C~S'.
(95 .0) Brecciated zone with clay and carbonate.
Soft.
(96. 8) Slickensides
R 23 100
90.2 (OJ·
to
92.0
R 24 83
92.0 (27)
to
95.0
.R .25 100
05 .. 0. {47)·
to
96,.5
R. 25 lCO
96 c; .... .1., (32}
to I
~ 97 .a
97.8 -121.0 Hig~ly ~ractured and sheared,_ c~l:!!. ~ ~~
loss 8 .• 4'. Zone J.s h1ghly altered ar::d w~.a~~ered j· to
throughout, moderately h~!:d to. soft. c1nd ll:rJ.able, lOO.l
clay gouge and slJ.¢kens~de:s tfu:oughcut.
35
(0)
Pemeated by carboua te.
·R 28
100.1
53
{0)
-I
I
I
i
·a-·· . . ~·
•
i
i .
t
I
j
I
.
I
I
(101.8. -109.6) Shear .zone. Core loss
gouge with angular
R 29 7 ·2 t • 101.8
rock to
.
3 }
(0) I
.
Calcarcou.r: clay
fragment!~ 1!
1.08.0
-, I
R 30 19
108 .• 0 (O)
to 1
I :-
.........
R 31 97
109 .. 6 I
los,.e <36>
+-o .
ll5.21
'.·
I .
I.:"''
'
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
~----------------------~-~~·------------~--------------------------------~~----2 -
ACRES AMERiCAN INCORPORATED ......._ ___ .....,~""-----------~
CON~su~ "P.JNG EMI!'I•·.·E ... z:-~(s ••~n cer~ANTS, INC. .... _ ~~ ll'..i n • ~ -. ............ .,. .._.._, .. ...
BUFFALO , NEW YORK ANCHORAGE , AI.~SKA
~·
CI~ILLING I=IEPCJI=IT
SU.ITNA .HVaRCHILIICTI=IIC PRCJ..JECT
for ALASKA PCIWSA AUTHCIAITV
HOLE NO • ...:B:::.::H::..-~2 --
SHEt.INO. 5 OF 13
SITE ~JATANA NORTH ABUTMENT JOB NO. P5701.05 (ACRES) 052504 (RSM)
118.2
0
Andesite and
Diorite
(Transitional
Zone)
DESCRIPTIO~:
(118.2) Highly oxidized.
Light green to gray~ fine grained andesite (as
described abov~) incerlayered with light to dark
green, fine to medium grained diorite (with
hornblende, plagioclase, biotite, orthoclase).
Rock types alternate throughout. Locally
competent, slightly <'lea there'd. Very close joint
spacing, numerous healeu fractures. Iron
staining on f~acture surfaces. Calcite present
in joints and f1:actures .
121. 0 • l41. 9 •l Highly fractured and shea.red
locally. More competent than rock above,
alight.ly t.o moderately weathered, with iron
staining on j oi~ .. surfaces.
(123-128.4) Possible shear zone.
(131.0·· 134.8) Core loss 0.2'.
141 • .9 167. 9 Highly fractured and
moderately hard to soft and .friable:
Generally incompetent, slightly to
weathered, iron stained throughout.
.·
sheared,
locally.
highly
(141.9 "" 153. 7) Shear zone, cor.e lo,~s greater
than 3 feet.
lLE:~T, cJfE.
OF RttC.
RUN CRt1DJ
R 32 80
::::, (30) I
R 33 82
118.2 (54)
to
121.0
R 34 89
121.0 (70)
to
125.7
R 35 100
125 .. 7 (30)
to
lJ8.4
R 36 100
!28.4 (54)
131.0
R 37 95
131.0 (0)
to
134.8
R 38 100
1.34.8 (84)
to
139.8
~-----------------....-.-. ._;.·---------...---------~· I
ACRES AMERICAN INCORPORATED ---~\~ .---.-:-----1 •. )
CONSULT1NG ENG1NEERS ~~~~~ c::s!.!!f-.!.~!1..!~ .
SUFFAtO , NEW 'fORt< ANCHORAGE , ALASKA · ,
a
··p. """""a-.1=1-.-IL_..L_I_N_G_I=I_E_J:I __ O_R_T_,-----'------,---,.-------i -
SUBrTNA H~'f"rlAD.LEC'T\AIC ~t=ID.JE!CT HOl..E NO. ~--2--,
for ALASKA I:ICWEA AUTHORITY SHEETNO. 6 ,.QF...ll. I
SITE WATANA NOR'l'R A.Btl'.t'MENT JOS NO. P570l.OS {ACRES) 052504 (RaM)
~----~------------~--------------------------------------------~--~~~ L~ c;_Q!£. DEPTH ROCK T'\" Pt:I DESCRIPftOMs OF RE;C. I ~o---..f-------... ---+1--------------·~-----..-----r--"-u_H-+c_R_Q_D-tl I
(144.4 -~~..8.0) No core recnv~red1 Triconed R ~1 Tri-, ..
through caved sectio~. 144.4 conec
151.0 Diorite
(148.0 .. 151.0) Very ·hard but incompetent.
loss 2.0·1 ~
Core
1~~-0 ''} i
R 42 33 I .j
148.0 (0)
co
,'151.0
Greenish gray, very fined t<:> medium grained with I R 43 67
I
porphyritic texture. Visible comp.ositional
zcning. Moderately b.ard. to soft, n..;,.,.derately
competent to weak and £r~able locally. Fresh to
slightly WF.tathered with iron staining on joint.
surfaces. Carbonat~ comm(.m throughout. Joint
spacing very close to wide.. Numerous fr~ctures
cemented with calcite.
(151.0 -153. '1) Highly fractured and weathered,
with ll. 9' .:la~r seam. Core loss 0. 9' .
(155. 7 -!38.2) Core lost) 0.5'.
151.0
to
153.7
(0) I
i
R 44 100 ~ •..
153.7 (20)
155.7
R 45
I. lSS. 7
to
(158.2
l
80 ••
(0) I
(158.2 -159.5) Highly fractured and weathered. I R 46 100
.
I Extensive oxida~ion~i~in fractures. .15~.2 (20)
160.2 -167.9 Core loss 0~4t.
167.9 -l7CL5 Abundant calcite within fractures
and joints.. Rock becoming more compet.~nt.
to
160 ... 2
j
~
I
1
.~ ~. ·':;..-
I
;
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I'
' ,.. "'~
~,
I
-'.,·
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••
I
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ACRES A~£RICAN INCORPORATED 1-------~J~ "'------------------1-
CONSULTlNG ENGINF;ERS !"•~ ~-~~~.!!:..!~
SUFFAt.O , NEW YORK ANCHORAGE , ALASkA
DRILLING I=IE.PORT .
BU.ITNA HVDACI8LECT~IC J:IAQ.JECT
for ALASKA r:IOWI!I=I AUTHQr:IITV
HOLE. ~!0 . ..-s .. a._-_..2 __ _
SHEET NO. 7 0 F. 13
SITE WATANi!. NORTH AEUTMEN'l' JOB NO. PS70l.05 {ACRES) 052504 (RQM} ~----..,...--------.... -~-· _ _,
ROCK TYP!: OESCRIPT10N: L~cek
OF REC.
RUN tRQO) ._,__··--+--~ . -----;--.-· .. -________________ _,_ _____ 'f-"'--'!r---"'-1
1
170.5 -172.5 Altered. Coarse grained 7 friable, R 50 100
highly fractured and sheared. Chloritized. 170 .• 5 (47)
to
112. .. 5 ... 175.8 ~o::e competent,. Fine to medium 175.8
graitied, joint spacing . moderately close.
Numerous fractures healed with calcite, R 51 100
175 .. 8 (0)
to 175 • 8 -177 . 0 Sheared, incompetent, calcareous .
177.0
177.0 -196.4 Light green to light blue .. gray. I R r 2 90
ve~~ hard' competent:, fresh. Joint spacing f l 1 .. : (87)
moderately close with occasional calcite to
fillings. minor sulfide mineraliza~ion l.Sl .. O
throughout.
(177.0 -181.0) Core loss 0.4'.
(191 ... 196 .4) Core loss 0. 7' .
196.4 _197. 4 Alteration zone.
we~thered, sheared. Cor.e loss 0.3'.
:.::',:/>
: '1 ' ' • : ~-..... :r.,...
R S3 lOO
181~0'100)
to
182.8
R 54 llOO l:.sflOO)
186.91 .
j. :a ss }1oo
186.9 100)
to
~89 .. 2
R, $6' 100
. . .·if lS9 ... 2 .~00)
)'. co
191.0
R 57
19.1.0
to
196.4
to
201.0
89
{74)
I.'
J
:
t----\.·:• ··--"=''i~~ ,..--------------t . ACRES AMC:RICAN INCORPORATED t------··;c.,_ --~~.;::....... i..---~------t
C. o·Nsu•. ·riNG .e ... ·, GJN~EJ!2S JIIAN e;cr -....TANT•, INC.
I
I '-I;,.J' " l"lO ri • • -a • .,. ~----cr4fha•DGNt
BUFFALO , NEW-YORK .ANCHORAGE , ALASKA
I
'
CIRILLING REPORT I SUBIT!'~A HVt=~Ci.LECTRIC r:IRCI~&CT
for· ALASKA I=ICWI!A AUTHCJI=IITV
HOlE NO. BH-2
SHEETNO. a· OF. 13
.
~ I r·
I. SITE WATANA NOR'l'H ABUTMENT JOB NO. P570l.OS (ACRES) 052504 {R&M)
ROCk TYPE DESCRIPTION:
205 .• 0 -205 • 3 Hi~~hly fractured.
L ;....,._ 21-I ·~•.., Cotfe.-
OF Rec. RUN -(RQDJ
R59 l;OO
I
2~;-o o{S4l I
203.8 t
R 60 100 I
203 .• 8 {30) .
to
207 •. 1·
. ( •• r 207,1 -209.3 Brecciated, healed. Core loss R 61 S2
t 0.4'. 201.1 {41)
to
209.3 I .
a-64 1oo ·1· ·.,
.'Zt09.3 {88) ·-· . '
o· 1
214.4-218.5 Core los8 0.3'.
214.4
R 63 '9:)
2l4 .4 (5"13)
' to
R 64 100
218 .. 5 {92) l
to I
22.3.7
223. 7 -228. ~ 7 Medium grained. Joint spacing R :65 99
close. Ir.on staining and calcite on fractl).X."e 223.7 (78)
zurfaces. . Core loss 0. 2' . ~ .,,o
222 .. 7
r·
',;, L
I ,,
! I;
t:
228. 7 -230. 7 Joint spacing moderately close, a 6.6 100
" Z't:.'Ck mo.re compt:.t.ent.. 428 ... 7 {82) a· 1
-, to . 1 230>1 -241.0 Altered, bleached.. Soft.~ Joint 232.5
1
sp-cing close, slightly to mod.ex-ate:ly · 'liet;tthercq. J · . I ·-.
1
:
Penetrative (to approx;ire.ately 1 em) i.rJu stainin~ :a 67 flOO ···1;
along joints • S~tlfide mineralization. · ?.)-;<-.(i1 (S.V l l · . !
--"~--~~-2~. 71 ' l li
~\ 'l' .· :
\\ ' "·<, .,
---·~· --~----~------~~~------~·;--~--~----~~~~------~--~-----.--~~~ ._. "l .. j
· .. ~ /,' .~-. "
¥. ~./L):
J,
I
I
I
-I
I
I
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I
I
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!I
'·· ·a
I
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ACRES AMERICAN lNCORPORAT£0 .,_ ___ __.;a ... ;__J.,;;;s;J..,._N:91~----------;
CON$ULT1N.G ENGINEERS !'•~•':u!'J!!4'"-!ffl.!!J..!~
BUFFALO , NEW YORK ANCHORAS£ , ALASkA
DRILLING Ri!PCIAT
SU.ITNA. :HYOACJ.LEC I RIC PRCI-JECT
for 1A.LASKA JlaWEI=I AUTHCIRITV
HOL.E NO. BH-2
SHEETNO. 9 OF: 13
SITE-WATANA NORTH Al}QTM€NT JOB NO. P570l.QL ... (ACRES) 052504 _{RaM}
-·-·---
~·
ROc:< TYPE DESCRIPTION a
~---+--------..;.-------------------------t.'·--+--""'1
241 .. 0 -241.9 Altered, very soft, ~lick clay.
R 68 lOS l
43'7 .7 {57}~
tl").
I
I
:..\~l-9
241.9 -252.2 HigU:l; fracturt=d and alt&.:•,·. I~ r?-
Contains numerous soft, friable zones throughot' ": \ 241.9
t"1i th calcareous clay common. Many joints weakl:~ -to
healed with carbona1:.e.. Zan~ is genezally 247.2
incompetent (~ossible shear zone)~
252.. 2 -257 .. ~ Slightly more competent.
257.2 -
friable.
clay.
262.2 Rock weakened and slightly
.Fractures filled wi.th carbonate and/or
262.2 -285.8 Light green to white.. Very hard'"
competent, fresh.. Joint spacing very close to
close, calcite and pyrite on joint surfaces.
(265 ... 0 -271. e) Core loss 0 ~5' .
R 70
247 .. 2
to
252.2
R 11
252 .. 2
to
257.2
R ';'2
257.2
to
262.2
R 73
262.2
to
263.0
R 74
265.~0
to
269.0
R 75
269 .. 0
to
27i~O
1~1 ......---------.~ •t -~...-.-..-...,......._~ ·-· . '·,::;_;-; ~~~~·
-"::i
l.ll
(20)
104
(.3S}
100
(82)
96
(80)
100
(71)
93
(75)
90
(90)
'-: ' -.~) '
-~..._, :.., L· ii . . o J:" ;· -4 ; ..
l
_____ :,__ ,• __ ... -_
. ~ '• -
,..... ........... _..._.....,.. .............. _,.. ....... ~..-""""'-• : ............. ,_ ........................ __ ~---------~-----.
ACRES AMERICAN INCORPORATED t-------~~----· --------~
CON:SULTlNG ENGINEERS !'!~M c.!a'a!!."a:~.!!J.!~
BUFFAlO , NEW YORK. ANCHORAGE ¥ALASKA I
~USITN~~ MVQPICJ•UICTP11C .. PPICI..IECT
tor ALASKA I:ICIWIII=t AUTHCIAITV
HOlE NO. :aa.-2 -
!~HttfNO. 10 .. OF. 13
SITE WATANA.Jt.QRTaAB!JTMENT JOB NO. P5701.05 .(ACR_ES} 052504 {R&M)
DESCRIJIT10Ns
I
___ .......,. -~t.L~<;_~
OF R!C.
RUN CRQD)
R 77 l.OO
276.~ (89)
to
280.6
R 7S 99
280 .. 6 (87)
tel
285.8
285 .. 8 -287. 8. Highly fractured 1 Core loss 0.1'.
incompetent. R 7 9
2SS.8
to
287.8
9s I
(40)
289. 1 Calcareous zone.
·-
301.1 -306.1 Core loss 0.4'.
30.6. 1 -310.0 J'oint spa~illg mo<ier~tely clos.e to
wide.
7 . .,-··.~-.,.·;.:;: ... ,~.c: .• =·.-o••---·· \,
\
R so 1.00"
287 ... 8 (9~)
to
291.~.
R 81 lOQ
291.1 (Gi.JJ
to
296.1
R 82 100
296 .. 1· {94}
tQ
lOl ... l
R 83 9~
301 .. 1 (80)
tu
-.3~.1 -
R 84 100
306 .. 1 (100)
to
310 .. 2
·'
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._~.
•' ·a'
._ .. _ .•.
. .
a
,~1· ..
. '
~------------~--------------~~------~----------~----------------------------~
ACRES AMERICAN INC:OR~RATEC ..,._....__ ___ ....,.. ;('·1.-SI .. ,_
CONSUL.TlNG ENGINEERS ~~~.S'~-J:'~.Jr!l.l!S;
BUFFALO ., NEW YORK ANCHORAGE , ALASJt:A
tLU.rrNA H~~QJ!:~C~IC: PRCJ.JBCr" Ht-'LE NO .. ....-BH-.-.... 2.......__
for ALASKA JICJWI!R AUTHDI=IITV SHEETNO. lJ. .OF....ll.
!)ITE WATANA NORm ABUTMF~· JOB NO. '· P5701.05 (ACRf~S)--052504 (R&M)
~----~------------~-----~
D!SCRJPTiONt ~.
322.0 Highly altered zone. Friable ..
328. 0 ... 348, 6 · Alteration zone, joint spacing
very ·close to moderately close, t1lf)derately hard
to soft and friable J:ocally. Sulfide mineral-
ization thr.oughout. Minor calcitt= and chlorite
on Saints.
(328. 0. 331 . 4) Slickensides .
(334.4-335.8) Highly altered aud friable ..
'r..~of· .•,, ccik.
-REC.
RUN (RQDJ
R 86 100
315.4 (99)
to
320.6
R 87 100
320.6 (Sl)
to
325 .. 3
~ 88 100
325.3 (85)
to
328.0
R S9
3~8,.0
to-~
332.4'
:R 90
332.4
to
337.5
R 91 f
337,.5
to
341. .. 0
R 92
34J. ... O
to
341..4
100
(62}
100 l
(90)
100
(97)
100
{100)
R 93 100
341.4 {100)
to
346 .. £i
348.6 · ... 3o/::·$ Fx:esh to slightly weat4ered, M.rd · ~~:~6 7~~).
to veey b;;.;lj.J. Joint spacing moder,-tely close to to
wide. 35l. .. o
ACRES AMEAICAN INCORpORATED . ...,_ ... ___ -..r;a-.._~.,;,;;::~·;-.4.... '------------1
CONSULTING ENGiNEERS ~~c.:!!!~!~~!S;
BUFFALO , NEW YO'RK At~CHORAGE , ALASKA . All(~ r l
CRI~L.ING ,REPC2AT
•u·IT~A HVCIACI.LBCTRIC Pr:IQ.JEICT HOLf, No._a_a-.... 2~---.
,for ALASKA PCIWEPI AUTHCII=IITV SHEET NO. 12 OF.l3 -.
SITE WATANA NORTII ABll'r!E!N'r JOB NO. P5701.05 (ACRES) 052504 (RS.Ml 1
DEPTH ROcK TYP! l DESCRIPTrONa LF•" C~ ~----~--·-----------~-~~-----------------------------------------r-~-u_N~(-~-~c_D-11 J
I
-
362.5 Dic.~~ite and
Andesite
R 95
351.0
to
356.0
R 96
356.0
to
36~.0
R c
Intermixed', transitional rock tYPes~ PaJJ.e greeri. --361..-0
cr whi'"-e, to gray. Phaneritic to aphanitic to
textl..\re·. Fresh with some alt;eration zones as 366. 0
noted below" liard. .Joints very closely spaced.
100
{96)
lOG
(100)
92
(92)
361.0 -366.0 Core loss 0.4' ~-
362.5 -363.5 Quart~ vein.
R 98 100
366.0 (lOO}_
to
370.3 -381.0 Calcite and sulfides in joints.
..
370.6
R. 99 100
370.6 (100)
l
j
l
j
'I
l
I
{375.8-318.0) Core loss 0.3'. R 100
375 .• 8
to
381.0
94
(87) 1
386 .. 2 -386.8 liighl'!T altered and so£t .•
386.8-... 401 .. 0' Hard, fairly competent ..
spacing very: close to clol\~. Numerous
joints throughout.
Joi.c1...
he.al::!d
R lOl
381 .. 0
~0
386.2
R 1.02
386.2
to
391.2
R 103
""9., 2 r~· 396.3 '
,,
I.
'l'' ' ...
'·'
100 l (65)
J
100
(88) j
; j
lOU .· ,J
(t~} j
~
/
,~'J ..
,,
' ,•,,
-::::::.~
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ACRf:S AMERICAN INCORPOR1TEO r------.....-~ .......... 1 S:Z ... ...,
co~C!u• .... I.NG ~NG'.NE. E.es ••M ~TANT., ~~ ~ '-I ~ I f'1 • •••• .._,,._t«tllif'c .._._.....-~11!1._. ....
SUrFA~O , NEW YORK AN.CHORAGE , ALASKA
· J:J.RILL.ING JIEPCJRT
t
. SU.ITNA HY1:3I=ICI.L.ECTRIC PACJ.JECT
for ALASKA I=ICIWIIPI AUTHCRITV
SITE WA'rANA NOR$ ABt:JT'MEN': JOB NO. P5701. OS
DEPTH DESCRI'PTION:
End of Hole
HOL.E NO. _.B .. K--2..._ __
SHEETNO. 13 OF. 13
(ACRES) 052504 (RaM)
L.-~ ..7~"i:F'" e~ . REC.
RUN (RQDJ
R 1.04 100
396:-3 (80)
to
398.S
R 105 100
398.S (lOOI
to
401.0
I
I
I
I
I
I
I
I -
I
I
I
I
I
I
I
I
I
I
I
ACRES AMERICAN INCOP.PORATEO
CONSUL.TlNG ENGINEERS
SUFFALO , NEW YORK
;aJ~. ------~----'-____ ....... _____ __.
a=-ai' .. <Q CONIIUL.TANT15, INC. . ...u..... ...-.c:saw~· ............. .-.e ......
ANCHORAGE , ALASKA
~-----------\------------------------b---------------------------------------~ ORILLL1NG REPORT
SUSJ~rNA HVQACELECT~IC PRCI.JECT
tor ALASKA PCJWER AUTHORITY
HOLE NO. a.s ... 6
SHEETNO. 1 OF~
SIT~ Watana North Abutment JOB NO. P5701. OS (ACRES) 052504 _ (R&M).
CONTRACTOR The. Drilling ComPany ,.. STARTED 07:.00 M. June 26 19 80
f9 so ------------.FlNISHEO, __ -___ M. July 9
DRILLING
METHOD
SOiL ___ cllfliai:Als .. ±n~g._· ,gAd-.vlloliw .. n~c; .. e.:_____ CASING ClAM. __ .... NW .... _...,-.... 1,...4...,"-.:.I ·:.:D=-··~l __
ROCK Diamond Coz:-9 Drillinq , CORE OlAM. ..,.. __ N.=Q .... -_3_.;.._··-<-.1-.-.-7_5_">..__
lOCATION: t.ATrruoE
OEPARruRE
BEARING
lNmAL DIP
NE52° 49' 24.891 ELEVATION$: DATUM _. _ __,_ _____ _
DEPTH
(} 0
8.0
16.5
24.5
Wl48° 32' 21 .. 862 DRILL. PLATFORM -:-------=··'"'--
2250 GROUND SURF~E--· .;:1;.:6 ... 0;;:;.;;·5;..,. _........., __ _
60° ROC1< SURFACE __ 1;;;;,;5;;;.;9;..;;8;.;;, • .;;:1 ___ _
OTHE:n DIPS---~ ........... ---BOTTOM OF HOLE 963.8
WATER TABLE 1458 ~2-06-80
~OC;< TYF€
Overburden
Quartz Diorite
Qu,artz
*onzonit~
Grsnodicrite
QESCRIPTION!
Bro"'~ .sandy g:r~vel wi tb. -:ebb les and boulders.
Pale green. to gray biotite, hornblende, Quartz
Diorite. Mafics approximately 30%, medium
grained, nonfoliate.d. Slightly to mo~era1:.ely
weathe.red. Joint spacing vecy close to
moderately close.. Iron staining present along
some joints , occasional healed fractures.
8.0 -10.7 Core loss 0.7'.
Light tan to light g~"ey, hornblende, Qu.art.z
Moqzonite. Fine to medium grained, nonfoliated.
Slightly to highl·; weathered, locally friable,
and porous. Iron staining and solution cavities
common,. Rock generally incompetent. Joint
spacing very close t.o close.
17.2 -18.0 Highly fractured ..
....,.~
l..ENGTH . •t.
·OF CORE,
~oN REC. ~ (RQD.)
·Run. ~
8 .. 0
:to
~{),.'7
~2
[1.0 .. 7
~0
lS .. O
Run 3
;t.s .. o
~0
t.9,6
~4
~9 .. 6
~0
~3 .. 8
74
(74}
93
(74)
102
(57)
83
(0)
19 • 6 -2 7 Highly ~ractured, core loss 0. 7 ' • ~un s 100
~3 .s {0)
Pale green to '&ray biotite hornblende quartz ,.., . 1;!;0-Granodiorite~ Maiic~ .1.-c:terage ~pproximately 20%. ~6-8
Fine: to mcdiUJn grai.nea. Moderately hard to very
_.R_ .. _RAHA._. _:t~M_. -_..J_ ...... HA:,........,GAN....._· _(R&M) APPROVED ---------(R ~M)
LOGGED SUMMARY ... L. ACOMB _ DATE
BY APPRoVED ----------""""·--· (ACRES)
-----------{ACR.ES) DATE
• " • ·• . • • ' ' . • ., . , • • . • A .' • • ., •. . •~:~ . .
I
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ACRES AMERI.CAN INCORPORATED tc----.-.r~-,.,........,._•..;:·;~:...o.~
CONSULTING ENGINEERS III&M ce-.!!!f--!.~~.!!\.!~
BUFFALO , NEW YORK · ANCHORAGE • ALASKA
QI=IILLING AEPORT
.USITNA HVJ:Ii:1C.LI!CTAIC Pl=la.JaeT
fer ALASKA t:IOWI!A AUTHCII=IITV
HOLE NO.
SHEET NO.
B.H. 6
2 OF. 20
S~TE Watana North Abutment JOB NO. P570l..OS (ACRES} 052504 .{Rf2M)
DEPTH ROCK TYPE
~~ .
DESCRIPTION: ~..--Jfe: "'OF'" c . REC.
RUff {RQC)
hard, fresh to sliS}ltly weathered. Limonite R 6 staining and clay residue on some J. oint surfacEs •
26.8 Joint spacing very close to moderately close with
as
(78)
joints ori·ented approxima.t.ely 40° to 55° to core ~~-0 axis. Occasional highly fractvLred zones 0. 1' to
1.1' thick, with clay gouge. Healed fractures
R 1 throughout.
30 .. 0
100
(67)
26.8 -30.0 Core loss o.sr.
29.5 -30 . 0 Highly fractured
Clay filling common"'
40.5 -45. 0 Core loss 0. 2.' •
45. 0 -49 . 1 Higr~y fractured zone.
and weathered.
49.1 -51.4
clay gouge.
Shear zone., highly fractured
to
32.8
RS
'32.8
100
(74)
R 9 100
37.S (78)
to
40 ... 5
~ :LO
~o .. s
~0
4S .. O
Ia .ll.
~s .. o
[t.Q
149-.l.
95 J l {91)
100
(66)
100
(31)
~ l.l lOO
~0~4 (0)
to
51 .. 4
~ 14 100
pl.4 (85)
to
155 .. 5
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ACRE$ AMERICAN INCORPORATED t--·-----><-.....;~~~: .......
CONSULTING ENGINEERS ~aM .~cc:.cco~'~~r.~• .... J:-&~~!,1..!~
BUFFALO l NEW YORK ANCHORAGE I ALASKA
CII=IILLING REPDI=IT
BUIIITNA I-IVDPIG.LECTRIC I=II=IQ.JECT
tor ALASKA PCWER AUTHOPIITV
SITE Watana North Abutment JOB NO. P570l.OS
HOLE NO.
SHEETNO. 3
(ACRES) 052504
B .. H9 6
OFJ.2..
(R&M)
DEPTH .. ROCK TYPE OESCRIPnON:
R . ~
' -~
ss.s
to
59.3
R 16.
59.3
to
63 .. 2
65.3 -75.3 Highly fractured and sheared zone R 17
slight to highly weathered, moderately hard to 63.2
sof·,. an.d friable_ locally. Joint spacing very to
close to close.. Hole caving during drilling. 66.5
(65 .5) Ver.y f~iable.
(66.5 -67.3) Cor~ loss o.s•.
R 18
66 .. 5
to
67.3
R 19
67~3
to
67.7
R 2.0
67.7
to
70.4
(71.5 -73.0) Shear zone, sli~~enslides and clay R 21
gouge. 70.4
to
75.3
R 22
75 .. 3 -149.4 Competent, hard to very hard fresh 75.3
to slightly weathered. Joint spacing very close tc
to wide.. 80.3
R 23
.. 80~3
to
84.2
100
(53)
100
(79)
100
(52)
0
(0)
100
(0)
lOCt
(59)
104
(59)
100
{88)
100
t92)
~
------.-~~~-·----------~·---~-----------------------~~.~--------------------_.--~ ,.
ii ;,
,:1
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ACRES AMERICAN INCORPORAiED. t---------~t-------------f
CONSULT1NG ENGINE~RS iii&M '::9.':~-~~!\Jr!::
BUFFALO , NEW YORK ANCHORAGE , AL.ASKA
DI=IILLING ~EPOAT
8UBITNA MVQPICI.LIICn:IIC t:'l=iCI..J&CT
for-ALASKA ~WI!R AUTHQAITV
HOLE NO. B .H. 6
SHEETNO. 4 OF-l!L
SITE Watana ~r.th Abutment ~.,.. JOB NO. P5701 .. OS (ACRES} 052504 {Rf&M) ,__ __ ,__ ______ .....,.....,_ ____________ ._
DEPTH ROCK TYPE DESCRIPTION:
-
89 ~ 3 -94. 6 Core loss 0 . 2' . .
98.5-100.3 Core lo~s 0.1'.
,,
.,
108.2-111.7 Core loss 0.1'.
L~-r"n cOlfE.
OF REC.
RUN (RQDl
R 24
84.2
to
89 .. 3
R 25
89.3
to
94.6
R 26
94 .. 6
to
98 .. 5
R 27
98,.5
t.o
100 .. 3
R 28
100 .. 3
to
10]. .. 5
R 29
lCU ... S
to
102 .. 5
R 30
102~5
to
103.1
R_ 31
103 .. 1
:C.o <'
108 ... 2
R 32
lOS . .::
to
111 .. 7
100
(96i
96
(85)
100
(92)
I 94
(89}
100
(75} I
lOO
{100)
.
100
{S3j
100
(71}
97
(97")
I
>':. .
I
•. 11'
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1
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ACRES AMERlCAN INCORPORATED lo-0-------t;(~~·~'--.-.--------t
CONSULTING ENulN~ERS ~,-.~!.~!~!!IS
BUFFALO , NEW YORK ANCHORAGE , AlASKA
CIRILLINGi REPORT
SU8n-NA HVCFIC2BLECiTI=IIC Pw:IQ..JI!CT HOt.E NO.. B.H. 6
for ALASKA JICIWBR AUTHC1RITY ~z.t~~rNO. s OF20
SITE Watana North~ Abutment JOB NO. l?570l~~(ACRES) 052504 {R&M) .
DEPTH ROCK TYPE OESCRIPTtONt
112.7-142.1 Core loss 0.4'. ..
.
I
I
I
I L_ ..
L£NU,-ru ~ . II., COft£
. OF REC.
RUN (~QD)
R, 33 100
l.ll ... 7 (91)
to
1.12. 7
IR 34
112 .. 7
to
117.2
R 35
ll.7.2
to
12.2 .. 1
a 36
122 .. 1
to
ll7.2
R 37
127 .. 2
to
128.7
R 3~·
i.
93
(91)
9S
(98)
100
(100}
laa·f
(100}.
\ 100
12.8 .... l>(lOO)'
to
130.8
R. 39 100
l30 ... S (86)
to
135.8
R 40 100
135.8 (78)
to
140.8
R 41 104
140.8 (98)
to
145.6
r
,........._.,_,____.._._~-~. --........-.-~-------.·-,
1
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A~RES. AMERICAN INCORPORATED t----._ __ ,.-,.. ~f-1-=S::Z ... _
<;ONSULTINS ENGINEERS ~~"'!-. '!~~~~
BUFFALO , NEW YORK ANCHORAGE ~j Al-ASKA
Qt:IILLING REPCJ~T
I
I
8U.ITNA HVI:JPICS.Lr!CTRIL.~ PPIO.JECT HOLE NO. B.H. 6 ~
for w. :!LASKA PCWEA AUTHCIAITV
57
SHEETNC • .,...§._oF. 3..0 1 '. •'
~·:SIT~'!E~=' a=='==a=N=o~rffi=~==Ab=·,~utm==3=n=t========~~J~0~8~N~Q.~, ~=p==·o=l=~O=S==(~A~C~RE=S~)=,=0=52=5~0~4==~(R~&~M~)~
, l.~ln il:-,. , , DEPTH RQCK TYPE
i
I
OESCRIPnONt
RUN tRQD) ,'
149.4 -149.6 Highly fract.ured.
152.5, 154.5 Altered> weathered zones, friable.
R 42
145.6
'to
150.6
R 43
'150.6
to
155.6
R 44
155.6
to
160 .• 6
160.6 -187w0 Highly altered and weatt"ered~ R 4S
Modera~ely hard to· soft and very friable locally.. lGO. 6
J'oint spacing very close to close. Minor sulfide· to
mineralization and c:al:'bonate throughout. Rock is lGS. 6
generally incomp.etent.
165.6 -175.2 Cor~ loss 0. 3 r •
R 46
185.6
to
1170.0
. I R 47
"'
'
-
170 .. 0
to
175,.2
R 48
l7S.2
to
l79.,B
R 49
l79.8
to
184.9
187 · 0 -240.3 Generally hard and fresh except R SO
for 'lfery 'Slight weathering along joints. and 184.9
fractures. to
190.0
,,
100
(90)
100
(78)
100'
(92)
I
* i i.
t
I
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I
' 104.'
(78)
98
(61)
96
(46}
100
(33)
-
I
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•
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100
'(73) 1.·--.·.· ,_
100
(88)
•
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~----------------------------~,--~------------~----------------~~----~ I .,
ACRES AMERICAN INCORPORATED ..,_ ______ __r;("'"'-~-=·~ .... ~-
·.1 PD[D I . CONSUI.TING ENGINEERS ...... t:;'!_a!C»N __ 'r' __ .... ~~...r~~ IIUD[d BUFi='ALO J NEW YORK ANCHORAGE ' ALASKA
CIAILL.INI3 REPOI=IT
•u•ITNA HVI:II=IQBI..ECTI=IIf; PRC.JECT
for ALASKA I=IQWEI=I AUTHCIAITY
HOLE NO .. B.,li. 6
SHEET NO. 7 OF. 20
SITE Wata.na North . Abutment JOB NO. Ps7ol. os (ACRES) os·2So4 CRaM)
DEPTH DE!tCRf!ITIONa
210.0 -215.0 Core loss 0.3'.
L~r.J·c~
OF '"tl. REC.
RUN (RQD)
R Sl 100
190.0 (100)
to
l95.J.
R 52 100
195.1 {100)
to
20042.
R 53 100
200 .. 2 (88)
to
205 .. 0
R 54 lCO
205-.0 (100)
to
2lo .. o
R 5:5 94
410-0 (96)
to
2l.S .. O
215.4 -215.7 Highly fractur·ed and moderately R 56 100
weathered. 2~5-0 (90}
to
220.0
a s7 roo
a2o.o (100) I
to
225 .. 2
a sa 1oo
225 .. 2 (93)
to
230.l
R 59 100
230.1 (100)
to
235 .. 4
I·
ACRES ·AMERICAN INCORPORATED t--------.....r;a--....::~~ ... :.;....~
CONSUL.TlNG ENGINEERS "aM ~-~~~~!.\..!~
SU~FALO I NEW YORK ANCHORAGE 'AL.ASKA
I:JI=IILLING ~E~CIPIT
BUBITNA ·HYQPICIILJICTI=IIC .PRO.J&CT
for AL·~SKA PCJWER AUTHOI=IITY·
HOLE ·NO •. B .H. 6
SHEET NO. a OF. 20
SITE Watana North Abutment JOB NO. E570:J.. os .(ACRES) 0525.!24 (REiM)
R 60 100
2~.5-4 (100)
to
240.3
240 · 3 -260.0 Transi ti~aal zone into tmdeJ::-lying ~ 61 ~ 102
quartz diorite. Com ;.ins thin altered friable 240 ·~ (gG)
2on.es locally. . Nume~ous; very thin veins ·of to
calcite throughout.. 245.5
(256. 0 -256. 7) Highly altered,
Clay filling (possible shear zone).
(255. a) Jlicken.sides.
very ·friable~
R 62
245 ... 5
to
249 .. 7
R. 63
24.9 .. 7
to
255.-0
R 64
255-0
to
260.0
100
(95)
100 1
(89).
102
{84}
260-Quartz Diorite Light green, to pink and gray hornblende Quartz R 65 lOO
Diorite. Fine to medium grained, nonfoliated 260•0 : (100)
with approximately 30% mafics ~ Generally hard to_
and fresh, clay and ;;;yrite crystals common on 2.G::>.l
fractured surfaces. Occasional thin (less than
0.1') calcite veins and healed joints throughout. ~ ~6 100
Joint spacing close to moderately close. 26:hl (100)
to
273 -273.7 Altered zone, friable, sandy locally.
27Q .. 2
R 67
270.2
tp
2'75 .. 0
100
(Sl)
275 -325.6 Generally hard, fresh and competent.. R 69 100
.Joint spacing close to moderately close. 275 .. 0" (96)
to
280.3
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PDfO CON$UL..TlNG ENGINEERS ~-M 'c:e!~!~'!'.!!J..!~ un 0 BUFFALO , N.EW YORl< ANCHO.RAG.E , ALASKA
CJRILLING I=IEI=IORT
SUeiTNA MVQR"ELECTRIC PPt:~,.JECT
for ALASKA J:IOWI!A AUTHCJAITV
HOLE NO. B.H. 6
SHEET NO. S 0 F 20
SITE Watana North Abutment JOB NO. 1?5701. OS (ACE!ES) o~~---:04 (R&M)
OEPiH L 21 ·~F "·" CoreE. 0 REC. ROCK TYPE DESCRIPTION:
RUl~ (RQC) ~--~~----------~------------------------------------------4---
R 159 100
280 .. 3, (100)
to
281.6
R 70 100
281.6 (100)
to
284.6
284.6 -290.6 Co-re loss 0. 2' . R 71 95 . 284.6 (95)
to
286.6
R 72 98
286.6 (98)
to
290 .. 6
~ 13 100
290 .. 6 (100)
to
295 .. 6
?
1R 14 100
295 .. 6 (96)
Ito
300 .. 7
R 75 100
300 .. 7 (100)
~to
f-I'Js .. o
~ 76 100
~05.0 (100)
~0
. -~l0.2
. 1R 77 100
' ~10 .. 2 (96)
itO ~--
-.-·-'· tn . .s. 4
I ..
". 1 •· .,
' j
{
· .. ··· .. J, .. .... .1 .
~------------------------·------~----------------~------------~~
ACRES AMERICAN INCOFIPORAT£0 ~-----~~ I
CONSUl.TJ NG ENGINEERS ~aM '!!" ...... -~-zii'-11!.-~-.. -~-:!-!J..:-1~-=-· -.-----; · _
BUFFAlO , NEW YORK ANCHORAGE ·, AL..ASKA
. '
I
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QPII&.LING REI=IQRT
I. 8U8rTNA HYaACI.LIICTI=IIC PPICI..JI!CT HOLE NO.--B-E--6._· --
ior ALASKA J:ICWI!R AUTHCIRITV SHttTNO. 10 o·r:2.o
SITE Watana North ru:,utment. . "'~ 'JOB. NO. P570l.OS (ACRES) 052504 (RaM) ~~======~====~~-~~~===-
L =."'"" cafE.
OF R!C. I 1----+--------+----------"------=··=--~ ----------+-... R_U_N__.,t_R_O_D-tJ . •
DEPTH ROCK TYPE DESCRIPTION a
I ] i 318.6 -320.1 Alte~~d zone, chalky, bleached, R 78
friable along joints. 315.4
320.6 ... 325 . 6 \.>Ore los$ 0. 2' .
to
320.6
R 79
320.6
to
325.6
325 · 6 -332 · 7 Highl;t f'ractured and altered, very R 80
soft and friable. Core loss 3. at . 3.25-6
to
330!<2
342.0 Altered zone, friuble, weakly
carbona~e.
~ 81
330.2
lto
3321>7
!R $2
3J2.7
Ito
337.9
healed with-R 83
~37 ... 9
Ito
342.9
lOO
(96)
96 r
(80) '{
78
(70)
20
(0)
98
(77)
104
(90).
343.0-343.2 Highly fraetured. Core loss !L2' ~ 1R 84 j1oa
1342.:9 {97)
Ito
348.8
352.9 -362.5 .Higb.ly fractured, friable, soft. tR 85 104
348.8 (100)
to
353.8
R 86. ·100
l3s3.a (96)
Ito
~58 .. 9
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ACRES AMEAICAN INCORPORATED t-------~r..-------___;..._,_.., ___ . ...,.
CONSUL.TlNG ENGINEERS ~aM *?la.~.!~!J.!!!:
BUFFALO , NEW YORK ANCHORAGE ,-ALASKA
Clt=IILLING AEPCI~T
~U-rrNA HVI:IAC1•L•CTRIC PI=IQ..IECT
for ALASKA J:ICIWI!I=I AUTHQAITV
SITE Watana North Abutment JOB NO. _, ?5701. 05
DESCRIPTIONs
HOL.E NO. B.H.. 6
SHEEi NO. 1~ OF 20_
(j\CRES) 052504 _ (RaM)
L£NGTHf ~ . :?;:'" "(if:-I ' i. ftC..
RUN . <~~c:;J -~----~----------~+-~--~-~---------------------------------------~----+---~
36 7. 9 Highly f.ractt!::'c:d 7 f17iable, soft.
368 .. 2. -373. 2 Core loss 0. 2' .
374.57 377.0, 380.4, and 382.0 Highly fractured,
friable~ soft.
R 87
358.9
'to
.363. 9
R 88
363.9
to
368.2
R 89
368e2
to
373.2
R 90
373~2
rto
l1S .. 4
382 -490.5 Generally hard fresh
Joint. spacin~J close to wide.
and compete~c. !R 9~
3"18 .. 4
(383 .. 3 -388.3) Core loss 0.1'. .
Ito
383 .. 3
1R 92
~83 .. 3
ItO
88 .. 3
.R 93
3SS .. 3
to
393 .. 3
~ 94
393 .. 3
~Q
fl98.3
~ 95
~S8 .. 3
tt:o
~00 .. 6
100
(52)
107
{98)
96
(96)
100
(77)
100
{94)
98
{98)
100
. (100) I
100
(92)
100
K~OO)
I
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,---........------.. ----___,~-----------_,I
ACRES AMERICAN fNCORPORATEO t------..i<~'"--·-......._ ______ ---t ·1.. ,
CONSULTING ENGJ.NEERS . III'.&M •ze~~~~
::-BUFFALO , NEW YORK ANCHORAGE , ALASKA
Dt=II!;..~ING J1EPCJAT
8U.~A HVIOI=ICIILIICTt=IIC PRCI.JIICT
for ALASKA J:ICJWI!~ AUTHCJ~ITV
SITE vlatana North Abutme.."lt JOB NO. P570l. OS
LIEPT'H · ROCKTYP! DESCRIPTION:
:·-.. ~-.. ' '"· .. ~:
HOLE NO. B .. H. 6
SHEET NO. 12,.. 0 F. 20
·· (ACRES). 05.2504 (RE2M)
L--. c~ .0Fnn
REC. ~fUN (RQO) .,
lR 96 . 100
400 .. 6 (100)
to
403 .. 4
R 97 100
403.4 (100)
to
406.2
1R sa 100
406.2 (100)
to
~1~.1
iR 99 100
f4ll.J. (lOO)
Ito
~16-3
fR lOO 100
~16.3 (100)
tto
142~.1
~ 101 100
~21.1 (100)
Ito
1425 .. 5
~ 102 lOO
~25.6 C98 >
t:.o
~~~0.2
R. 103 100
~30 .. 2 100}
t:.o
435 .. 4
~ l04 1.00
. ~35.4 ~100)
~0
~4.0.4
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ACRES· AMERICAN·IN~nPORATED ~"-'---~---.-f<'-_1~-S::l ... ....,.
CONSUL.TtNG ~!lfGINEERS •e.M cca_z::~~IW~•~~~!J.:~!!].
BUFFALO , ~£W YOF.Jt< ANCHORAGE , Al.ASKA ~
m
RU81TNA HVCIACIIILIICTI=IIC PI=ID..IIICT HOLE NO • .a.H. 6
for ALASKA J:ICWIJA AUTHCAITV SHEETNO •• _.~OF.2 0
SlTE·· Watana North Abutment JOB NO. · P570l., OS (ACRES) 052504 (R&M)
DEPT'H ROCK TYPE
.
DESCRIPTION:
~. .... _ ~
''QF'" C~E. REC.
RUN tRQDJ
R lOS loo·
440.4 {100)
to
445"6
R 106 100
445. 6 (1.00)
to
450 .. 41
454.5 -454.9 Highly fractured~ friable, minor 4R5-.01 ~~ 1(9°i_)
sulfide mineralizati.on.
461..6 Fractured zone.
463.2 -464 Mineraliz~d zone, very soft, core
loss 0 .4l.
to
455.8
R. lOS
455.8
to
4$8 .. 2
R 109
458 .. 2
tQ
463 .. .2
R llO
463 .. 2
to
464.0
R lll
100
(100)
100
(100)
13
(0}
100
46 .... 0 (100) .
' to I 468 .. 4
a 112 100
468.4 . (1"00)
to
473.3 .
476.2-476.4 F;ractut:ed zone. R 113 100
47.i .. 3 (98)
to
. 477 .a
'
,.----1
ACR£5 AMERICAN INCORPORATED .t-------.J~'------------1
CONSUL.T1NG ENGINEERS lllaM '!:.18!!!!~.!!!'!1,!~
BUFFALO , NEW YORK ANCHORAGE , ALASKA
CIAILL~NG REPCJt=IT
SU.ITNA HYI:1RC.L8CTI=IIC PRQ.JECT HOt..E NO. B .. H. 6
for A&.ASKA PCJWER AUTHCAITV SliEETNO. 14 OF.20
SJIE Watana North Abutment JOB NO •. P570J..OS __ (ACRES) 052504 (R&M)
DEPTH ROCK TYPE OESC:RfPTiOfJ:
479.1 Slickensides.
L~cek
OF REC. R!~ CRQO)
R 114 100
47:' .• 8 (96).
co
4.80.3
,. _,. R 11.5 100
490.3 (92)
to
485 .. 3
485.3 -490.5 , Core barrel mislatched during R 116 73
drilling. Had to pull rods and radrill; core 485.3 (73)
loss 1 . 4' . to
490.5
490.5 -650.0 Generally fresh, ha.rd, competent. R 117 100
490.5 {100)
to
495 .. .5
-
498.5, 502.1 Joints filled ~iith calcareous clay. R. US 100
495.5 (90)
to
500.5
R ll9 100
500 .. 5 (78)
to
505 .. 6
R 120 100
sos ... s (100)
to
510.6
R l2l 100
510.6 {100)
to
515 .. 6
R 122 100
515 •. 6 (100)
to
. 520~2
.,.
f-
~----._--------~~~-.--~-------------~-------------,~--------~--~--~
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CONSU 1 ':TtNG ·e:NGI-uEERS JIU.t.M CO~TANTfil, JNC..
. lr. . . . ,.. . -----··'f'· ..... F .... -··-
BUFFALO t NE:W YORK ANCHORAGE , ALASKA
ICJAILLING AEJIOI=IT
•u•ITNA HYI:JPIQ.LECTRIC PACI.JECT ·
for AL.ASKA I=IDWI!R AUTHCJ:IITV
HOLE NO. B.H. 6
SHEET NO. 15. OF~-g_
SiTE Watana North Abutment JOB NO. P570l.OS (ACRES) 052504 {R6M)
J
DESCRIPTION:
52.0.2-521,.0 Slightly f7;iable~ CoJ;e loss 0.1'.
L-·--~ '~ Cotn:. OF R£C.
!'YN (RQD)
R 123 98
520,.2 (83)
to
525.6
R 124 -·104
525.6 (92)
to
530.4
530.5 -532.5 Altered zone" soft, clayey; hole R 125 100
caved during drilling. 530.4 (50)
to
53~.8
R. 126 ~00
531 .. 8 (0)
to
532 .. 0 .
R 127 100
532.,.0 (67)
to
533~5
533.5 -539~5 Core loss 0.8f. R 128 87
533,.,5 (87)
to
539 .. 5
R 129 96 . 539 .. 5 (86) 539.5 -547 .5· Core loss 0.4'.
to
544.6
R 130 93
544 .. 6 (66}
to
547,.5
R 1:31 100
547.5 (83)
to
5$0 ... 4
i
ACRES AMERICAN INCORPORAiED ~::::::::~--;~~·~~~ ... :~· ~~:.:.:.:::.:-:::-_---··-·:_:_:_:::::~
C ~NSU'':TING ~ ... •GJNEERS · Ji&M CCI"~TANT•, 1"-'C. .~~ ... I;J"t . • ,. ·-.-. ...... ~----....,, .... ;:~
BUFFALO , NEW YORK ANCHORAGE , ALASKA
CIAILLING AEP!DAT
8U.ITNA MVCIRCIIILECTRIC PRCI.JECT
for ALASKA .a""BPI AUTHCIRITY
HOLE NO. ·a.H:. 6
SHEETNO. 16 Of:20
SITE Wa'ta.l"'la North Abutment JOB NO. P570l. OS {ACRES) 052504 (RS!M)
DEPTH I ROCK TYPE DESCRIPTION:
L-·-.::'.1-·~·"c~ OF REC.·
RUN CRQD)
~---~------,~-----+-------------------------------------------+----~--~
562.7, 565.0 Slickenside3.
565.7 -570.7 Core loss 0. 8 • .
(569 .0) Hig.b.ly fractured and sheared,
gouge.
572.3 -573.1 Brecciated, clay gouge.
590.8 -592.8 Core barrel mislatched
--'"'-'"'O·drilling, had to pull rods, core loss 0. 5 .
clay
during
R 132
550 .. 4
to
555.4
.R 133
555.4
~ ... o
560.4
R 134
560 .. 4
to
565,.7
R ~35
565 .. 7
to
570 ... 7
R l.36
570.7
to
575 .. 9
R .137
575.9
to
"580. 7
R 138
580.7
to
585.8
R .139
585.8
t:o
59048
R 140
590.S
"to
S9:iL.8
100
(88)
100
{98)
100
(.lOO)
84
(80)
100
(77)
100
{94)
lOO
(86)
lOO
(84)
75
(75)
.
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A~ II ACRES AMERCCAN INCORPORATED 1----....... ---r-~"'\.;~~..::~:;....~ . -'----_..;.------w4
CONSULTING ENGINEERS ~aM '!!'.!!!.~~!~~
BUFFALO , NEW YORK ANCHORAGE t ALASkA
~~====--------------------~-------~~--------~-------------~ CtptiLL.ING .t=IEI=ICRT
8U.ITNA ·HVCIAC.LECTAIC I:II=ICI.JECT
for ALASKA PCWEI=I AUTHCIRITV
SITE Watana North ~~a.utment JOB NO. PS70l.OS
DE:SCIUPTION r
613 -615 Altered and friable,
healed joints • Core loss 0. 9 ' .
625.2-630.2 Core loss 0.~'.
··-, ..
-:... .. __ ._,_,..,
HOL£ NO. B .. H. 6
SHEET NO. 17 OF.20
_{ACRES) 052504 (R&M)
j t,ENG'i, •z ca&:. OF REC. I RUN (?1QD)
R 141 100
592.8 {80)
to
597.8
R 142 100
597.8 (83)
to
602 ... 6
R 143 100
602.6 (65}
to
608 .. 3
E. l.i.\4 100
6QS ... 3 (97)
·to
6ll.S
soft, numerous R 145 77
61.1.5 (64)
to
615 .. 4
R ~46 100
61.5.4 {96)
to
620~2
R 147 100
620.2 (100)
. to
625 .. 2
R. 148 96
625 .. 2 {.92}
to
630. 2"
R 149 100
630.2 (88}
to
631.8
ACRES AMERICAN INCORPORATED .....,_. ____ 52,~'-'1 :.~ ... .., •.• -w .... '
CON. SUt.:.,.IN' .G r!!NGI N t:ERS ,..M CCQI~---J--&; ... TANTSit INC. .. ' . -~ ... ,_ ~ ----· .................... _
BUFFALO , NEW YORK ANCHORAGE , ALASKA
DAII..L.ING r:IEPQ~T
SU.ITNA HVDt=ICII!LECTAIC Pt=ICI..JECT
for ALASKA POWER AUTHORITY
SITE Watana North Abutment JOB NO. P5701.05
HOLE NO .. · B .. H.. 6
SHEETN~ 18 OF.20
(ACRES) 052504 (R&M)
-·-.!?!..
ll
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DEPTH l.~'" Cdta:. OF REC.· •.
RUN (RQQ) .
OESCRJPTtONa
650 Grani.te
64l:.O. 7 Joint filled with crushed rock.
Light gray to white, fine to· medium grained,
nonfoliated with approximately 5% to 10% mafics.
Hard, fresh .and competent. Minor sulfide
mineralization throughout~ Numerous healed
.fractures and joints, ca.rbonate coating on joints
common. Joint spacing close to moderately close
with joints oriented -approximately 40° to 60° to
core axis.
R 150
631.8
to
636.7
R 151
636.7
to
. 540:..5
R 152
640.5
to
645.6
R 153
645.6
to
. 650.0
R. 154
650 .. 0
to
655.8
·~ 155
655.8.
to
660 .. 6.
R 156
660 .. 6
to,
66.'5.8
R 157
665.8
to
670.8
'
R 158.
670 .• 8
to
676.0
100
(90)
100
(~00)
100
{94)
100
(100)
100 (
(92:
100
(63)
100
(67)
100
(88)
100
(77)
-
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--r-. -----.. ...,.,. .. ~. ~-,-~--~~~--"""""":',-....--.---...---------------.
ACRES AMERICAN tNCORPORAn:O 1--------"~'---------......._---""'f
CONSULTlNG ENGINEERS III&M -~~~~!~!!:
BUFFALO , NEW YORK ANCHORAGE , ALASKA A~~II ~====~------------~L-----------------------. DRILLING I=IEPCJRT
--
SIU.ITNA HYCI=tCI.LECTr:IIC PACJ..JECT HOLE NO. B.H. 6
SHEETN~ 19 OF.20 for ALASKA I=ICIWI!A AUTHCIAITV
SITE Watana Nol:Sh Ymtment JOB NO. 1?5701 ~OS (ACRES}--952504 (RSsM)
DEPTH' ROCK TYP£
t
\\
686.2 -712.2 Shear zone, joir~t spacing very
close to close, moderately hard to soft and
friable locally. Rock ~~n.erally le..:;s co.mpetent,
minor sulfide minel.alization throughout .•
Carboilate common.
686.2 -687 ~9 Core loss 0.4'.
(686 .. 2, 690.0, 695.11 699.3, 704.0, 708.2)
Slickensides with clay gouge, soft, friable.
- -'·q ... '). l.~caf£.
OF REc.·
RUN (RQDJ
R 1.59 100
.676.0 (98)
to
680.6
R 160 100
6SG.6 (S4)
to
685.4
R 161. 84
685.4 (80)
to
687.9
R 1:62 104
687,9 (89)
to
692 ... 5
R 1.63 104
692,.5 (74)
to
697 .. 5
R l.'64 100
697.5 (92)
to
702.5
R, l.6S 100
702:.S (67)
to
707.4
R. J.66 100
101 .. 4 (94)
to
712.2
{R 167 102
712~2 (100}
to
717.J.
ACRES AMERICAN INCORPORATED ~o---'--.r•Q:"'-~-=--:....~ ''-----------------1
CONSUJ.TI NG ENGINEERS !!a•!!'a c::2.r:!f.~!2!!!.\..!!!:
BUFFALO , NEW YORK ANCHORAGE , AL.ASKA
CJI=iiLLING r:IEPOI=IT
SUBITNA HVJ:II=ICIBLECTAIC l=lr:IO.JECT
for ALASKA I=ICWI!R AUTHORITY
HOLE NO. B.H. 6
SHEETNO. 20 OF20
SITE Wa:t-ana North Abutment JOB NO. P5701. OS (ACRES) 052504 flRSM)
DEPTH DESCRIPTION:
722.0-727.1 Core loss 0.1'.
R 168 104
717 .l. (92)
to
722 .. 0
R 169
722.0
98
(88)
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727.1
R 170 100
727.1 {100)
to
730 .. 5
R J.71 lOO
730 .• 5 {96)
to
73544
R 172 100
73.5.4 {80)
to
740 .. 4
740.4 End of hole
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ACRES A:MERICAN INCORPORATED
CONSUL.TING ENGINEERS
BUFFALO , NEW YORK
--~----~~~~------------------~ .r:=IC.M CONSULTANTS, INC.
~--....................... _ ----··..ee
ANCHORAGE 1 Al.ASKA
CRIL~ING REPCt=;T
SUSITNA HVOI=IQELECTRIC PRC..JECT
for ALASKA ·PCI~EJ:I AUTHCRITV
HOLE NO. BH-8
-SHEET NO. 1 OF 19
SITE Watana South Abutment JOB NO. P5701. 05 (ACRES) 052504 {R&M)
STARTED 1:00 P.M. 7/29 19 80 --.. CONTRk"TTR The D:t:illina Company
DRILLiNG
METHOD
LOCAT10N=
.FINISHED M. 8/9 19 80
CASING OIAM. NW 4" I.D. .. _ SOIL --=c-=a=s=in~q~A=d~v..:~~an~ce:oc..;-.. ... -------
~\CK Diamond Core Drilling n~ ---------------------------
CORE OIAM. NQ-3 (1.75")
LATtTUDE N62o 49'
OEPARruRE Wl48° 32'
11. 686 ELEVATIONS: DATUM
BEARING 600
17.664 CRILL .PLATFORM----------· ~.
GROUND SURFACE_.-,19-7.-6 ____ _
INITIAL DIP 60° ROCK SURFACE 1964
OTHER DIPS------BOTTOM OF .HOLE --~1~32~6~----
WATER TABLE 1960
OEPTH ROCK TYPE DESCRIPTION:
0.0 Overburden
a.o-
13.8
13.8 Porphyritic
Andesite
0. 0 -1. 0 Organic materials.
1.0 -8.0
boulders,
sampled.
Brown saady gravel with silt and
grading into angular cobbles. Not
Weathered bedrock.
Pale tan to gray, very fine to fine grained
groundmass with numerous light colored
phenocrysts. Generally hard to very hard,
friable locally. Slightly to moderately
weathe.t"ed with iron staining on joint surfaces
and penetrative sta.:..JliAg and weakening up to 1 em
immediately adjacent to joints. Less weathering
with depth. Joint spacing very close to close.
Occasional joints healed with carbonate.
13.8 -28.8 Core loss 2.0' ..
13. 8 -33. 8 Modera.tely· to highly weathered,
friable locally. Penetrative iron staining
throughout.
Run 1 71
13 .. 8 (10)
to
lS .. O
Run 2 91
18.,0 (22)
to
23 .. 8
Run 3 94
23.8 (54)
to
28.8
Run 4 100
(13.8 -18.0) Some residual interstitial sand 28.8 {30)
and silt. to
33.8
..._H __ aioioig•en.-· .._-_.Ra ... -,;;,;h;;;;a;;;;int-.. ___ (R S M) APPROVED ------------{R &&M)
DATE L,OGGEO
BY
SUI!Il!al:'j( b.y. Feldman , Acomp
__ .......... ___ _._ __ (.ACRES) APPROVED --------(ACRES)
DATE
---------------------------------------------------------·------------------~~
' ·. •·· . ,, ~· ,. ~ ·'·. -....
I . . . l
~• ACRES AMERICAN INCORPORATED 1-------r~-,....;;:!~:~:....~ '-.----------.. -------1
CONSUt.TlNG ENGINEERS ~aM ~!~!.~~
BUFJ:'ALO 1 NEW YORK ANCHORAGE 1 ALASKA
SUSn'NA HVQACJ.LECTR!C t=IRC'J.JECT
for ALASKA POWI!R AUTHCJ-.ITV
HOLE NO • ....-EH ... -_.a.__ __
SHEETNO. 2 OF~
SITE __ w.,_a-.t-an-.-a....._s_ou_·th_. _Ab_· _u_tm_en_t ___ _ JOB NO. PS701.05 {ACRES) 05,504 (R&M)
DEPTH FlOCK TYPE
49.6 Di.orite
--.Y.t-l.~f!"!! c~ DESCR~PTlDNa OF REC.
RUN (RQ~)
33. 8 -49 .. 6. Rock becoming more
Slightly to moderately weathered
staining on joint surfacas.
33. 8 ... 38. 8 Core loss 0. 3' .
competent. Run 5
with iron 33 ... a
to
38.8
Run 6
38.8
to
43.9
Run 7
43.9
to
45 .. 6
94
(40)
100
·(61)
100
(0}
( 48. 3 -SO·. 6) Sandy clay material along contact Run 8 73
with underlying diorite. Soft and friable. Core 45 .. 6 tO)
loss 1.5 feet. to
49.6
Pale pink to greenish gx-~y, fine to mediwn Run 9 86
gx-ained ccystalline rock. Non-foliated, 49 .. 6 (0)
approximately 20% to 30% mafics. Generally hard to
to very hard, fresh to slightly weathered, with 52 .. 5
iron staining on snme joint and fracture
surfaces. Carbonate ..::t.,romon thr.oughout. Joint Run lO 100
spacing very· close tll moderately close .. 52 .. 5 (281
Occasional joints haaled wi1;~ carbonate. to
49 . 6 ... 65 • 0 Moderately weathered and altered
with some bleaching. Locally soft, clayey zanes.
56.5
Run lJ
56.5
to
59~5
113
(67)
(59 . 5 -63. 6) Dark g~ay fin~ grained basalt dike Run 12 98
containing inclusions of brecciated, altered 59.5 (29)
diorite, a:Pd carbonate veins. Core loss 0. 1 • . to
63 ... 6
Run 1~ 100
63.6 (64)
to
68.0
" ' s....---"'*---------.._ _______ ...,..-...i:·c•· _____ ..__.....,._..._.......,,.._. _ _..._r...,_~-----~
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ACR6 AMERICAN INCORPORATED .__---~~.....__-----------f
CON-su• ·:rtNG ENG-iNE~Rs -·M CCI'lelJIL.T.&NTa. aNC. &.. iQ. a.-E -..-.... " • .._,........_ ~tf•e~t•
BUFFALO , NEW YORK ANCHORAGE ,ALASKA
DII=IILL.ING I=IEPCIAT
au•IT~A HVaRCJELECTAIC: PL-" .... -~ECT
for ALASKA POWEPI AUT'HCJRITV
SJTE Watana South Abutment JOB NO. P5701.05
DEPTH-ROCK TYPE DESCRIPTtONa
HOLE NO. BH-S
SHEET NO. 3 0 F. 2.9 _
{.'\CRES) 052504 (R&M)
-· L-·-cdk ·or·" ltEC. RUN (RCDl
~--~------------~-----------------------------------------+----+---~
7 6. 0 Thin altered zone.
77.7 -89.0 Highly fractured.
slickensides.
Some faint
89.3 -91.6 Highly fractured, friable locallv.
" .,
91.6 .. 96.6 Core loss 0. 2' .
Run 14 104
68,.0 {100)
to
73.,.0
Run 15 1@'0
73 .. 0 (43)
to
77~7
~.m 16 103
17 .. 7 (57)
to
80 .. 7
Run 17 100
80~7 (57)
to
84 ... 0
Run 18 lot>
84 .. 0 (64)
to
la.9 .. 3
Run 19 100
S9""3 (43)
-to
.91.6
Run 20 96
9~ .. 6 {60)
to
96 .. 6
Run 21 100
96_ .. 6 (100) 1
to
101.0 }
Run 22 100
101.0 {83)
to
106.2
ACRES AMERICAN INCORPORATED ~----;c•'-~.,r..::._~-~
CONS. U. I .,I·NG ENG·. lNEERS. ,. .. M CQCCl ........ .4.. .. ~TANT.Il INC. .... I I II!U. ...,._,_,. ....._ eo.f-·Vlll!&!l
BUFFALO 1 NEW YORK ANCHORAGE , ALASKA
I:Jr:IIL.LINGI I=IEJ:IOAT
8UUITNA HVCii=IC1.LECTRIC P~CI.JECT
1or ALASKA J:ICJWER ALJTHCJt=lrrY
HOLE NO. -BH-..-..-8-. __
SHEETNO. 4 OF.l9
\ SliE . Watana South Abutment _ JOB NO. P570l. OS {ACRES) •. 052504 (REiM)
ROCK TYPE DES.CRIPTION•
116.1-121.1 C .. ·e loss 0.1 1 •
L. --0'.1£. ·o,•" e . . · REC.
RUN tRQD)
Run 23 100
~06 .. 2 (100)
to
lll.O
Run 24 100
ll.l .. 0 (92)
to
ll6.l
Run 25 98
11.6 .. 1 (98)
to
121-l
123. 0 -124. 0 Highly fractured zone.
alt.ered and bleached.
Slightly Run 26 100
129. 0 Faint slicke1nsides.
135. 6 -140. 8 Core loss 0. 2' .
140 ~ 0 Rock generally fresh to bottom of hole.
l!! .. l J (94)
~26 .. 1.
:un 27 lOO
,.-26.1 (100)
to
1.31. .• 1
~un 28 lOO
l3l. .. l (96)
to
135.6
!Run 29 96
135.6 (88)
:to
140.8
!Run 30 86
140.8 -142..9 Prominent joint sets at 25° a71d 140.8 (43).
35:: to core a~is. Core .1ss. 2 .. 1' •
146.0 Slickensides.
to.
1142 .. 9
~un 31 100 ·
~42.9 (88)
to
fl.48.0
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!liJ
ACRES AMERICAN INCORPORA1l!O ~------><---~~~ .......... ·
CONSULTING ENGINEERS ~M cq_r:~r=rM~•9,..a.L.!~!1..!~
BUFFALO I NEW YORK ANCHORAGE , AI..ASKA
. CIJ:IILLING I=IEI=IORT
8UBITNA H't"J:3Rc:3E.LECTI=IIC PI=ICJ.JECT
for ALASKA I=ICWER AUTHCJPIITV
SITE Watana Soutb Abutm.ent _ JOB NO. P5701.05
HOLE NO. _BH_-a __ _
S-HEET NO. -5 0 F.l9 .
(ACRES) 052504 {Rf:aM)
~-----~-----~!""""------~·-~· ----------------..-.-...... ...,.-. IL._'_ elk. DEPTH ROCK TYPE OESeRIPTION:
157.7 -167.5 Core loss 0.6 .
·~'"C I OF REC.
RUN (RQD)
tRun 32 10.0
"[48.0 (98)
to
152.6
~un 33 100
P-52.6 (100)
to
157.7
!Run 34 96
fl-57.7 (96)
to
~62 .. 7
!Run 35 92
p.sa .. 7 {63)
to
~61 .. 5
fRun 36 100
P-61 .. 5 (70)
to
ll.7l.. 9
171.9 -173.6 Altered and brecciated zone with Run 37 87
clay an.d sand filling, Soft and friable. 171.9 (52)
Calcareous,. Core loss o. 6 feet. to
185.9 -194.2 Core loss 0 .-6' •
\. -·
lil6 ... 5
~u.n. 38 98
176.5 (91)
to·
~Sl .. O
Run 39 100
l8l.O (100)
to
185.9
~un 40 91
~85,.9 (88)
to
~89 .. 2
",_~ _..............~~~~------, --.--.--~I
~------~~~r---------------------·-ACRES AMERICAN INCORPORATED t------.,-,...~£~.:• .. .,.. 1.._-. --~ --. ---· ...;,_,-·-----t
C""NSU' ·:r·t N. G E,..GI N EERS Jlt&M cs::"Jf·-...t&.TANTa JNC. \..:: '-.,IJ . , •••' aa a -••••.,•· ..,_ ..:.., ... -
BUFFALO ) NEW YORK ANCHORAG.E , ALASKA
CAILLING REPCI=1T
EU.ITNA HVt2RCI.LECTRIC ~RCI.JECT
·for AL.ASKA PCIWBJ:ll AUTHCII:;ITY
SiTE Watana Soutr ... Abutm~t JOB NO. PS70l.05
DEPTH ROCK TYPE. DESCRIPTION:
•>
BH-8 HOL£ NO.----
SHEET NO. 6 0 F ..l.2..
.(ACRES) 052504 ·~-(RSrM)
l.--~ ,~t.., c~
OF 'REC ..
RUN (RQD)
Run 41 9~
189.2 (88)
to
19~.2
Run 42 100
194.2 (9S)
to
l99.2
~un 43 100
P.,99.2 (100)
to
f20l.O
1Run.44 100
20:t .. o (lOO)
to
2.06.2
206.2 .. 21L.O, 213.0 Some alteration and minor ~ 45 100
sulfide mineralization~ 206 .. 2 (92)
221 . 2 -225 .• 4 Some c hydrothermal
loc~lly fractured and friable.
to
2ll.O
.. ·Run 46 100.
2ll.O (90)
. to
21S.l.
Run 47 100
al.S .. l (95)
to
21.9.3
~ 48 100
~19 .. 3 (84)
to
~21.2
alteration, ~un 49 102.
~21~2 (98)
to
~25.4
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~~==~------------------~~------------~~~----------: ~ CIRILLING REPORT
SU.ITNA ·HVQI=ICI.I.ECTRIC a:ii=ICJ-JBCT
for ALASKA JICIWEPI AUTHCJI:tiTV
HOLE NO. sa-s
SHe:ET NO. 7 . Of: 19
SITE. Watana South ~utment JOB NO. Ps7or. o5 (ACRES} os25o4 (RaM)
ROCK TYPE DESCRIPT10N•
230.6 -235.6. Core loss 0.2r.
L ..... ...,... ~·~··, CQKt'. OF REC.·
RUN tRQD)
Rup. 50 lOQ
225 .. 4 (J.OQ)
to
230 .. 6
Run 51 96
230 .. 6 {96~
to '
235 .. 6
238.0 Slightly altered, bleached and somewhat Run 52 lOO
softer. 235.6. (91)
245 .. 6 .. 251.0 Core loss 0.1'.
251.0 Thin clay seam.
261.5, 270.0 Highly f.ractured zones ..
am•
~
to
240 .. 9
Run S3
a4o .. 9
to
245 ... 6
!Run 54
245 .. 6
to
251 ... 0
Run ss
251 .... 0
to
25$ .. 2
~56
255~2
to
260 .. 1
Rurl. Si
260 .. 1 .
to
265~1
100
(100)
98
(87)
100
{93)
100
(100)
.
lOO
(94)
Run· sa 100
265.1 (90)
to.
270 .. 1
\
·\
m_ .~ J • l l
'•· ,__.....· .. ·· ... ~--.__-.....--.----------------------.,:· I
\;
ACRES AMERICAN JNCORPORATEO 1---...---.r-...;(~·8.;::~ ... _,· ...... -----------t
CONSU l ... lNG 'E' N~JNEER' s· .. aM caFM.A.1'"ANTll, INC. .... ..... . . ...... ,~ ............ , ..... ., ...
BUFFALO , NEW YORK AP41C:HORAGE r. AL~SKA
CJRII.L.ING r:IEI::IORT
SUBITNA· HYQRCI.LIICTRIC PAD.JI!CT
for ALASKA. I=CIW.A .. AUTHCIMITV
HOLE No._:a_H.._-_.s __
SHEET NO. 8 O.F. 19
SITE Watana South. Abutment JOS NO. P5701.05 ·(ACRES) 05.2504 U~S!M)
ROC< TYP!
''
O.ESCRIPTtON•
284.4-287.8 Core loss 0.1'.
--· :t..t-l.~·n e~
OF REC.
RUN tRQD)
Run .59 100
270.~ (89}
to
275 .. 3
Run 60 100
275 .• 3 (100)
to
280.2
IRun 61 1oo
280 .. 2 (100)
to
284 .. 4
Run 62 97
284,4 (94)
to
'287.8
287. 8 -291.0 Mislatch of core barrel during Rtu:t 63 7$
drilling. Core badly ground. Core loss 287 .. 8 (~9)
0.8 feet. to
307 ~8 -308.8
~eat4er.ad-, so£t.
Highly tractured,
291 ... 0
~un 64 100
291.0 (lOO)
to
296.1
Run as 100
296 .. 1 (98}
to~·
300 .. 8
!Run 66.100
300.R . (97)
to
303.7
moderately Run 67 100
303 .. 7 (100)
to
309_,.8
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ACR!S AMERICAN INCORPoRATED 1------_......, ~~~:J--______ _.._ _ _,
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PO[@ CONSULTING ENGINEERS !-•M ·:a~!.~!\.~r!: · . unm ., . BUFFALO • NE.'W YORK ANCHORAGE • ALASkA
CJRILLING I=IEPCIRT
.U.ITNA HVI:It=IC•L•CTFIIC PACI..JECT
for ALASK-A ~WI!R AU .. lHCII=IITV
HOLE NO. BH•8
SHEETNO. 9 OF. 19
SITE _. Watana South Abu~t .;OS NO. P5701. OS • {ACRES). 052504 {RtiM)
DEPTH ROCK TYPE
318.8 Granodiorite
340 .. 0 Diorite
DESCRIPTION: l.~n cek
OF REC.
RUN (RQD)
taun 68 100
308.8 (93)
to
313 .. 2 '
faun 69 100
J13.2 (100)
to
318 .• 2
Pale green to pink and gray, fi"J.e t.o medium ~un 70 100
grained crystalline rock. Non-foliated with 318 •. 2 . (94)
approximately 20% mafics. ·Hard to very hard, to
fresh and generally competent~ Joint ,spacing. 321..5
close to moderately close.. Occasional carbonate
coating. !Run 11 100
324.5 Thin felsic dike ..
326.9 -330~8 Core loss 0.1'.
332.4 .. 332.8 Ft!lsic dike.
32~.5 (100)
'326 .. 9
!Run 72 97
1326 ... 9 (97)
to
330.8
P-un 73 100
IJ30 .. S (90)
to
fJ35 .. 8
. ~ 741100 Gra~ to pale g:een and pink, f~rt~ to . medJ.WD ~3S..,a •. (g3)
gra1.ned crystalll.ne rock. Non.-folJ.ated w~th 20% tC)
to 30% mafi.cs. Hard .. to very: ·hard, fl;'esh~ ~40 .. l
Generally competent.. Mino.r sulfide mineraliza-
tion. Joint spacing very close to mod('lrately ~un 7S 100 close. Occasional joints healed with calci-te. ~40 ... l (SS)
t..J 341.0 -344.0 Highly" 'frac.tured zone. ~4~ .. 2
343.2 -375.5 Localized dikes and veins
fine grained andesite.
~un 76 of gray,
343.2
,11;0
G48.A
100
{92)
) .
~------~~~-r.-----------c----------~ ACRES AMERICAN INCORPORATED ~'~
CONSU• '!'1NG 'ENGI_N.EEZ!!I. S Ja&Mc.c:; ~SCI~F-!!:.J2'-1:1:rA~9 INC. --'---n • . --.... -·••• • . • • ..,..,. ......
SUFFAl..O 1 NEW YORK ·. ANCHORAGE , ALASKA
I
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J:II=JILLING REPORT
8U8rrNA HVCIRC.LECTRIC J:IPICI.JECT
for ALASKA PICWI!R. AUTHCJRITY
HOl..E NO. aa-a •.
SHEETNO._lo OF.l9 . , l
SITE'' Watana South Abutment JOB NO. P5701.05 (ACRES) 052504 (R &M l I
L~, cZt-Df~ ROCK TYP! DESCRIPT10Na OF ~ '----·---t--------+--------..,__----..-....---'"".-------1--~~RE~C.;;;.;•~ ..•.... r-~ RUN ( ~QD) . .
R. 77
348.4
to '
351,..8
R 78
351. .• 8
to
356.8
R 79
356 .. 8
to
360.9
R so
360.9
to
364.2
364.2-365.5 Core loss 0.1' ~ R Sl
364.2
to
365 .. 5
-R. 82'
365.5
to
370.5
R 8~ . ~ ...
370.:
to
.:.::s .. !
R 84
375 .. .:
to
380.4
R 85
380.4
to
384 .. 0
100
(71)
100
(100)
100
(100}
100
(67)
92
(92
100
(90
100
(90
100
(96)
100
(94}
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ACRES AMERICAN INCORPORATED s-------~~:·~.;·~....... ~:_::::::,.:::::::::::::~
CONSULTING ENGINEERS ~~~~~'':t.'T!.l.!~
BUFFALO , NEW· YORK ANCHORAGE , ~LASKA
~~==~--~--------~~=,----._------------~--~----------~ I:IRILL.ING t:1EI=ICIAT
au•rTNA .MVCRCIIII.I!CTRIC J:lr:IC.IECT
f~,, ALA8KA JICIWI!R AUTMQt=IITV
SITE Watan~ Sou~ Abutment JOB NO. P570l.OS
DEPTH ROCK TYPE DESCRIPTION:
HOLE NO. ·BH-8
SHEET NO. 11 OF 19 .
{ACRES) 052504 (R f2M)
·-··-7~ -~·"c~ OF REC•
RUN (RQD)
364.0 .. 386.0 Possible shear zone, soft and R 86
friable with clay and sand infilling along 384.0
102,
(46)
joints. to
389.0
• IR S7
389"0
t..o
393.4
100 1
(86)1
406. 0 -403. 7 Alteration
friable. Core loss 0. 4 feet.
zone, soft,
R 88 1.00
393,.4 {100)
to
397.7
R 89 100
391 .. 7 (96)
to
402..,3
and R 90 93
402.3 (45)
to
407.S
R. . 9~ 100
407 .. s (58}
to
4ll. .. 9
R 92 100
4U.9. (96)
to .
4l7-l
R 93 100
417.1 (90)
to
421 .. 0
R 94 100
421.0 . (96)
to
426 .. 4
~--------------------------~------~~------------------------------------~
ACRES AMERICAN lNCORPOAAiED ~------cr~--...t·• .... ~ ........
CONSULTING ENGiNEER l MaM .. C:t;!. -=-!:=~~! ... ~~-=~~!J..!~
BUFFALO , NEW YORK At4CHORAGf. , ALASKA
·------------------------------~------------~----------------------~ Cli=lt1LLING AEPCIRT
liUBITNA HVCIACI.L&CTI=IIC PRCI.JECT
fo.r ALASKA PCIW8R AUTHQAITY
SITE Watana. South Abutment JOB NO. PS701. OS
HOLE NO. BH-a -
SHEETNO.__g ... OF..;.~
{ACRES) 052504 (R&M)
~----~------~----~--------------------------------~·----------~----~~-1 l. --.xt.-
1 DEP···-T-H~----R-OCK __ TY __ PE_. __ ~--0-E-SC_R_I_Pn __ O_N_'~--------------------·----------~-·-~o_F_"'~"~-~-c_:·~ _ RUN (RQD)
l
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430.4 to 436.0 Highly fractured and altered iR 95
zone, friable with some chloritized joints. Core 426 .. 4
loss 0. 7 feet..
(435.6) Shear zone, rock brecciated
gouge, very soft. Core loss 0. 2' .
with clay
to
431.0
R 96
;431. .. 0
t:o
433.6
~ 97
433~6
to
436 .. 3
440.0 -443.5 Highly fractured and sheared zone. R 98
Core loss 0.3 feet. 436.3
100
{65)
107
(35)
93
{33)
98
(79)
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R 99
441 .. 0
to
446 .. 0
94
(70) ••
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446.0 -451.0 Core loss 0. 7 feet. R 3.00
446.0
to
451..0
iR 101
451..0 .-
to
456.2
~ 1Q2
456 •. 2
to
4El.o n
fa 103
~61,.0
to
465.4
86
(90)
100
(100}
100
(IOOj
100
(100)
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cotl~u· :rtNG ENG'NEERs· ••M ~r'Ja.A.TANT•·•M:. ., -. _ i ,... •••••• ~~ "tUtllh.e,..,_.
BUrFALO , NEW YOKft ANCHORAGE , ALASKA
SLIBrrNA HV-ar:ttmiLECTI=IIC Pl=la.JECT HOLE NO. _.BH--....-a..__
for A~ASKA POWER AUTHCIAITY SHEETNO._.J,J OF. 19
~=SI~T!E~=w~a~t~~~a=S=o=u~~~~~u=~=~~t~~~~~!J~O~B~N~~~~P5~7~0~1~-~0S~(ACRE~052504 (R&M)
. 1 L~·-~ O!f'T'H ROCK TYPE OEScft • ...-.lON• 'QF''" C REC.
476.6 -476.9 altered zone soft, friable.
491.5 -495.0
0.2 feet.
Altered zone, soft, core
RUN (RQD)
~ 104 100
~65.4 (89)
to
f467.2
lR lOS 100
~67.2 (100)
to
~70.2
1R 106 100
14j0.2 (90)
to
f475.4
!R 1;07 100
~15.4 (90)
to
f480 .. 6
IR lOS 100
!4S0 ... 6 (100)
t:Q
48.1.7
R .109 100
f4,Sl..7 (81)
to
~85 .. 5
fR llO . 100
k\85.5 (100)
to
f49o ... o
loss R lll 96
490~0 (90)
to
fl95.0
ra 112 1oo
~95.0 (100)
to
1499 .. 9
l
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,.-.---""--------------.~---~.-=--------------"·-
ACRES AMERICAN INCORPORATED ..,._ ___ __.s;(....._j~-~:.......~
CONsu l "'~"I NG ENGlN EERS fit AM C:CC:.I:INI ____ A'-TANT., JNC. 1.1 •suee t a 1 ....,...,.. •• '"'-•...-. eu.w•.,. ...
BUFFALO , NEW YO.RK ANCHORAGE ,ALASKA
m-a SUSITNA MYCII=ICIJIIiLBCTs:IIC s:JPIQ-.IECT HOLE NO." ___ _
for ALASKA Jii'-...1111IEI=I AUTHORITY SHEETNO. 14 OF...a.
~=~~T:E~c-;·"=~:a:~:-~:~:a=S~a~u:~:~~~=-:~:~=~=~~--~~~~~J~O:B_·:NO:·~=P~5701.05 {~REm~52SM (RaM)
L.EtfCi11't c~
OF REC. DEPTH ROCK TYPE
I
.
DESCRIPTION:
505 . 2 .. 520 . 6 Altered zone, bleached,
sulfide mineralization.
510.2 -515.6 Core loss 0.1'.
(515.6-518.6) Soft and friable.
-
RUN (RQD)
e. ll3 100
f499.S (96)
to
~05.2
minor~ 114
505.2
to
510.2
10.4
(78)
R llS 98
51Q ... 2. (72)
to
?lS .. 6
R ll6 100
~15 .. 6 (80)
to
~20 .. 6
a u1 100
520 .. 6 (98)
tQC
525 .. 7
~ ll.S 100
~25.7 (92)
to
~Jo .. a
a ll9
530.8
to
~36.1
R 120·
536 .. 1
to
541.1 c
~ l2l
541.1
to
546 .. 3
100
(57)
100
{94)
100
(100)
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ACRE$ AMERICAN INCORPQRATEO 1------";2~·"-------------;
CONSUi ·:r·tNG ENGINE:"RS . III&M CC:F~ANT11, INC.
'---I .......... , •• I ••• ~ .....
BUFFALO , NEW YORK ANCHORAG~ , A&..ASKA
r:'l~~ILL.ING I=IEPDI=IT
SU.ITNA HVCI\JICeLECTPIIC PI=IQ.JECT
for ALASKA I=ICW.R AUTHCIArl"t'
SITE Watana South Abutment JOB NO. P-5701~ OS
HOLE NO. BH-a -
SHEET NO. 15 0 F. l9
(ACRES) 052504 (RS:M)
DEPTH ROCKTY~ DESCRIPTION: l.---~ '(lF'"~. REC.
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RUN lRQD)
~ 122 ~00
546 .. .3 (100)
to
55~ .. 2
551 .. 2 -552.6, 664.0 -556.4 Highly fractured
zones. R 123 100
551 .. 2 (50)
to
ssa~s
1R 1.:24 1.00
55.~ .. 6 (50)
to
556 .. 4
Rl2S 100
556.4 (42)
to
56!. • .2
R J.26 100
5&1. .• 2 (100}
to
566.2
1R U7 100
566 ... 2 (89)
to
sn.s
571.6 -596.0 Altered zone, sulfide mineraliza-R l.2S 100
tiou .. 571. ... 6 (95)
to
575.4
(580 .. 0 "" 580.5, 587.6) Highly altered, soft and~ ~29 lOO
friable with some carbonaceous clay filling. ~75~4 (100)
to
580 .. 5
1R l3a 1oo
1580.5 {96)
to
p85 .. 6
'
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~~~----------------------------~-------------------------------------~
~------~~~)·~~~~Vr.-A--------------------~ ACRES AMERICAN INCORPORATED r-~ v t
CONSULTING ENGINEERS ~aM, c:!'.!'!l...!-:1"~~!,,_~~
BUFFALO , NEW YORK ANCHORAGE 1 ALASkA
r:J~ILLING AEPCIAT
BUBITNA HVCIMC.LECTRIC PACI.JECT
tor ALASKA t=ae:IWI!I=I AUTHQRITY
HOLE NO. _s_a .... -.... a __
SHEETNO. 16 OF.l9
SITE Watana South Abutment JOB NO. P570J.. OS (ACRES) 052504 (R&M)
DEPTH D!:SCRIPTION: · L.~-.' .. , cdfE.
. REC.
RUN (RQD)
-
[R 131 100
585.6 {76)
to
590~7
(592.2) Brecciated zone. Core loss O.l'. R 132 98
590.7 (77)
to
596.0
R 133 100
596.0 (82)
to
601.0
R /~4 lOO
601.0 (80)
to
604.0
R 135 102
604 .. 0 (94}
to
1609"'0
609.0 .. 634.0 Highly fractured zone, with clayey R l36 97
filling along some joints, numerous joints healed 609 .. 0 (50)
with carbonate. Core loss 0.1 f. to
(619.6, 633 .. 3) Slickensides.
612 .. 4
R. 137 100
612 .. 4 (56)
to
617.6
R 138 100
617.6 (56)
to.
621.0
R 139 100
621.0 (62)
to
626.2
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A~ll~ CONSUL.TING ENGINEERS
BUFFALO t NEW YORK I' I DI=IILLING REPCRT ~ ..
.U.ITNA HVI:IRGIIL.IICTJ:IIC PACJ..JIIC,' HOI..E NO. _BH....;.;..-... 8 __
'
for
SITE
.
-
..
-
ALASKA POW•r:a AUTHC1~1TY SHS:ETNO. 17 OF~
~i'atana South Abutment JOB NO. P5701. OS (ACRES) 052504 (R&M)
ROd< TYPE
~·-·~ ,. ....
,
OESCRfF'TIONt L.~ cJ£
OF REC.
RUN (RQD)
tR 140 100
626 .. 2 (69)
to
628.8
R 141 100
628.8 (75)
to
634.0
1R 142 100
1634 .. 0 (98)
to
1639.3
~ 143 100
~39.3 (9S)
to
~43.5
!R 144 .100
643.5 -648.8 Medium to coarse grained 1643 ... 5 (94)
brecciated rock with clay gouge, friable and soft to
locally, partially healed with carbonate. !648 ... 8
'
R 145 100
~48.8 (100)
to
1653.8
tR 146 100
1653 ,;9 (100)
to
l659 .. l
~ 147 100
~59.1 (94)
to r4.l
148 100
664 .. 1 (100}
to
669.4
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I. . . '.. AC. RES A.MERICAN INCOR. PORATEO t----...r-;(~.J~:~:.....I. .
ftUD[d BUFFALO , NEW YORK ANCHORAGe , ALASKA
1:1~11-LING I=IEPCIRT
aUBITNA HVCJI:;a.LECTI=IIC PAQ.JECT ·
for ALASKA PQWI!R AUTHCJRITV
HOLE NO. BH-8
SHEET NO. 18 OF 19 .
SITE watana South Abutment JOB NO. 1?5701. 05 _(ACRES) 05;2SQ4,_ {REIM)
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ROUFN R!C. ·I· .· !RQD)
ROCK TYPE DESCRIPTION a
•
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669.4 -674.7 Localized
joints. Core loss 0. 3 feet..
---. -
clay filling along iR 149
669.4
to
674.7
94
(91}
iR 1so 100
1674.7 {94.)
to
679.9
1R 151 100
'679.9 (98)
to
~85.2
iR 152 100
~85.2 {100)
to
[690 .. 2
690.2 -693 .. 0 Mislatch of core barrel during IR 153 86
drilling, core badly ground. Core loss 0. 4 feet. 1690.2 (86)
to·
~93,.0
IR·ls4 100
1693.0 (74)
to
~98 .. 0
fR 155 100
~98 .. 0 (73)
to
~03.1
R 156 100
!703.1 (74)
to
~oa.s
~ 157 100
~08.5 ~~100)
to
' 1713 .. 1
~
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CONSU. _•·:rtN. G ~·GtNEE~.s-•aM c=II'-1!.-TA.fliT•,aNC. -~
'-&;.1~ n • . -.... ,.~ "' .... ~ ....--......
BUFFALO , NEW YORK ANCHORAGE ,ALASKA
CIAIU.ING REs:aCAT
BU.ITNA ·HVI:II=IC1BLI!CTAIC PRD.JECT
for ALASKA PCJW.PI AUTHCJRFT'V
HOLE NO, BH-S
SHEETNO. I9 OF..J.S...
SlT.E Watana South Abutment JOB NO. P5701. OS (ACRES) 052504 {R&M)
DEFTH J ROCK TYPE DESCRIP110N~ L.~n cJIE.
OF REC•
RUN (RQDl
713.1 .. 719.4 Mislatch _of core barrel during
dri.lli.a.g, core badly ground, core loss 0. 6 feet R 158 90
some carbonaceous clay along joints. 7l3 .. l (59)
719.4 -724.7 Altered zone, bleached,
soft and friable, pitted. Core loss 0.2•.
locally
to
719.,4.
R 159
719.4
to
724.7
R ~60
724.7
to
729.3
96
(79)
100
(98)
I
R 161 100.
72:9 .. 3 (100)
to
734.3
R 1.62 102
73.4.3 (98)
to
739 ... 3
R. l.63 104
739.3 (90)
to
744.3
1R 1£4 100
744 ... 3 (80)
to
749 .. 4
7 49 . 4 Soft, friable zone ... ~ l65 100
749 .. 4 (82)
to
7SO.S
750.5 End of Hole
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DEVIl CANYON
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Co. Ns .,-1 G ENGI EE!:ts RaM cCNIIuL.TANTs, tNc. · UL:1 N N n ·-··---.. , ....... __ c~,. .. ··-
BUFFALO ,NEW YORK ANCHORAGE , ALASKA
·cRILLING AEPCRT
SUSITNA HVCII=ICJELECTRIC PI=IQ.JECT
for ALASKA. PCJWER AUTHCJRITV
HOLE NO. BH..al
SHEET NO._ l_QF..1.Q..
srr~ DEVIL CANYON ~lQRTH ABUTMENT JOB NO. PS701.05 {ACRES) 052504 {REaM)
CONTRACTOR __ THE __ . D_R-.l,_LL_!N_G....._C_,O_MP ..... ANY __ ...___ STARTED 12:00 P .M .. _.-A:,;.UG;:..:: ·;...::2;.;:;;3 ___ 1gso
ORIUJNG
METHOD
LOCATION=
DEPTH
--------------.FINISHED M. AUG. 31 198~0..__
SOU. Casing Advancer CASING OIAM. -ii1NW'=~•(4~-·-~ ..,:;I..:.;.D:::..=--'>----
ROCK DIAMOND CORE DRILL CORE DIAM. NQ-3 (l. 75 .. >
LATtTUOE N 62° 4 9 I ll. 4~7 ELEVATIONS: DATUM __________ ,
DEPARTURE w 149° 18 I 24. 797
BEARING 22So
INITIAL DIP ___ 6_70 ___ _
DRILL PLATFORM -------=--'"""'"""' GROUND SURFACE _ __..l-.4-15...._ ___ _
ROCK. SURFACE 1404 . 1
OTHER DIPS------BOTTOM OF HOLE 724. 4
WAT:~ TABLE 1223 O.l-21-80)
DESCRIPTION:
'. LENGTH ·,-:-
OF CORf!. ou .. l REC.
n " CRQC.)
ROCK TYPE
0.0 Overburden Sandy g~avel with some silt and scattered
·cobbles. Not sampled.
11.8 Phyllite
0
Gray-brown with intercalated quartz stringers
forming 30~ of rock. Foliation regular to
swirling at 60° to 90° to core axis. Moderately
hard to hard; slightly to moderately weathered.
fractured and friable throughout. Becomes less
weathered with depth. Limonite staining and
minor clay or sand along discontinuities.
12. 8 -14. 8 Highly fractured. Core loss 0. 6' .
17.5 -18.3 Highly fractured.
Run l 85
ll~8 (20)
to
15 .. 8
Run 2 100
15-8 (88)
to
20.8
Run 3 85
20 .. B (59)
20.8 Argillite Medium .gray to dark gray, vecy fine to medium
grained. Laminae oriented· approximately 30° to
core axis . Contorted quartz stringers and
irregular bedding throughout. Generally hard to
soft and friable locally. Fresh to slightly
wea~.b.ered along joints and fractut'es with
limor.d.te staining co!IIDon and occasional clay
filling. Minor sulfide ntinerali:zation: and
carbonate throughout ... Joint spacing close to
very close.
to
26 .. 2
R .. RAHAIM . -J H..:li.GAN (RSM)
.LOGGED SUMMARY -B. HOLM;
BY ....
(ACRES)
APPROVED
DATE
.APPROVED
DATE
Run 4
26.2
to
31.3
86
(82)
{R &M}
(ACRES)
I
~------------------------------------~----------------------.~·._ ________________ _,
ACRES AMERiCAN INCORPORATED t-----_.~ ... ·~ ..;::~·~:......~
CONSUL.TlNG ENGlNEERS .._lll_a_M-~"=!!!M~.!!l.-!!5
BUFFALO , NEW YORk ANCHORAGE , ALASKA
CIAILL.ING REJICIRT
SU.ITNA HVQRCI.L.ECTRIC PRD.JECT
for ALASKA POWER AUTHCIAITY
HOLE NO. _.B._H_-... r __
. SHEETNO. 2 OF: 20
SITE D~rtt, C.i\NYON N. ABQTMENT JOB NO. P5701. OS (ACRES) 052504 (R6M)
DEPTH ROCK. TYPE
49.0 Meta-Argillit~
DESCRIPTION:
20.8-31.3 Core loss 1.5'.
(21.8 -22.3) Quartz-carbonate-pyrite mineral-
ization with bleaching from weathering.
(25.0, 26.4-26.6) Soft zones.
31.3 -35.0 Slightly fiss.ile. Core loss 0. 3l .
Dark gray pelitic rock with occasional bluish
gray laminae. Sheen along irregular fracture
surfaces. Very fine to fine grained. Lamina.e
ori.ented at approximately 0° to 30° to core. axis.
Moderately hard to very hard. Well indurated
with slight fissility locally. Fresh to slightly
weathered with limonite staining on joints
colllllon. Elongated quartz grains scattered
throughout. Euhedral pyrite commonly associated
with bluish zones. Some open voids from leached
sulfides. Joint spacing very close to moderately
close, with occ:assional chlorite or clay filling.
N'~1Jilerous old fractures rehealed by quart.z
throughout. .
1.---.7-i.-'c:F'" \.OOHC. REC.
RUN (RQD)
R 5
31.3
to
35.0
as
35.0
to
40 .. 0
92
(68)
100
(86)
R 7 1.00
40 .. 0 (90)
to
45 .. 0
R.S
45 .. 0
to
49.0
R9
49.0
to
53.2
R l.O
53 ... 2
to
58 .. 3
R.ll
58~3
to
63 .. 5
100
(98)
100
(69)
98
(92)
100
(86)
49 . 0 -84. 0 Q'la.t·tz, irregular veins and cement R 12
along old partings, 4% to 12% of rock. 63 .. 5
to "'
so
(0)
63 .5 -68 .. 9 Highly fractured. Core loss 1. 1'· . 64 • S
68.1 -69.2 Quartz vein With sulfid~s and some R 13 86
voids from sulfide leaching. 64 ... 5 (66)
to
68~9
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ACRES AMERICAN INCORPORATED 1-----.-.~~'-------------1
CONSULTING ENGINEERS ~aM C:S.~!~!J.!!!:
BUFFALO·, NEW YORK ANCHORAGE , ALASKA
CII=IILLINGI REPCJI=IT
SU.ITNA HVQRCI.UICTAIC PRO.JECT
for ALASKA PCJWI!R AIUTHCIRITV
HOLE NO . ._..B ... H_-1....__
SHEET NO. 3 OF. 20
SiTE DEVIL CANYON N. ABUTMENT JOB NO. P570l.OS {ACRES) 052504 -(RtlM)
DEPTH ROCK TYPE DESCRIPTIONt
L.--.7.1-·~'" c~ REC.
f'UN (RQD)
R 14 100
68.9 {88)
to
72.3
R J.S 100
72.3 (92)
to
77.2
R. ~6 94 79.0 -109.1 Highly fractured and sheared zone. 7 ~ 2 (S 3 )
Poor core recovery with core lo.ss of 4. 6 feet. ~"
Slightly to highly weath~red throughou~, residual 80°7 soil locally. •
R 3.7 94
80 .. 7 (48)
to
84,0
84.0 -101.5 Quartz stringers a~~d veins forming R 18 87
40% to 60% of rock. Numerous small cavities. S4 .. 0 (70)
i!O
. 90 .. 0
R 1'9
.90 ... 0
to
94 ... 4
R 20
94 ... 4
to
97.8
lt 21
97.8
to
lOl.S
lit 22
101 .. 5
to
105.0
·.
91
(50)
88
(29)
54
(0)
71
(23)
1
~----------~------------------------~-------------------------------------·---
ACRES AMERICAN INCORPORATED 1-----....J~'------------i
CONSULTING ENGINEERS •aM =~~'!.1..!~
BUFFALO 1 NEW YORK ANCHORAGE , At.ASI<A
CIRILI.ING AEPDa:JT
BUBITNA HVI:JACIELIECTRIC PI=ICia.JECT
for AL.i.\SKA I=ICWBR AUTHDRITV
HOLE NO. BH-1
SHEETNO. 4 OF. 20-
SiTE DEVIL CANYON N~ A3U'!'l.m:NT JOB N~~. ",,: =P5=7=0=1=. O=S=(~A:,:::C:,RE:::S~!)=0=5=25=0::;4==(~R~t2;M;.:,)~
L.-~-Ok DEPTH ROCK TYPE
105.0 Argillite
OESCRIPTlON:
Medium to dark gray, very fine to fine grained
lami~e oriented approximately 0° to 20° to core
axis. Contorted quartz s.tringers and irregular
bedding throughout. Generally hard; soft and
friable locally. Fresh to slightly weathered,
with limonite staining on joint and fracture
surfaces. Minor sulfide mineralization
throughout. Joint spacing very close to
moderately close.
109. 1 .. 265.6 Sulfides 3% to 8% of rock.
109.1 -175,0 Most joints at 60° to ~ore axis.
Limonite common along joints. Numerous drilling
breaks.
112.5-117.6 Core loss 0~7•.
(114~0 -114.8) Quartz vein.
117.6-118.6 Vertical quartz :inclusion.
120. 9 -129. 0 Clay filling in joints. (Possible
gouge).
·~·" c . OF REC.
RUN (RQD)
R 23 95
~05.0 (32}
to
J.09 .. 1
R 24 100
109.~ (85~
to
112 .. 5
R 25 86
112 .. 5 (80)
to
117 .. 6
R 26 100
117 .. 6 (79)
to
12.0.9
R 27 100
120.9 (73)
to
125.0
( 12.5 . 0 -129 . 0)
0. 05' within run.
R 28
Joints and fractures open to 125.0
87
(63)
Core loss 0.5' . to
129 .. 0
129.0 -148.0 Joint spacing very close to clo.se. ~. 2.9 100
129 .. 0 (94)
to
13.4. 0 .
>
R 30 lt~O
134.0 (91)}
to
139.2
R 31 100
139 .. 2 (90)
to
144.3
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CONSUl.TtNG ENGINEERS !"~~~~!t..!~
f3UFFALO , NEW YORK ANCHORAGE , ALASKA
QAILLING I=IEPICI=IT
llUB!TNA HYJ:JP1Q.LIICTRIC PI=ICI.JECT
for ALASKA J:IOW.R AUTHCAITV
HOLE NO. BH-1
SHE£.1' NO. 5 0 F ...l.Q..
SJTE DEVIL CAm'ON N. ABUTl-'I..EN'l' JOB NO. P5701 .. 05 (ACRES) 052504 (RflM)
OEfTH ROCK TYPE PESCR!FnONa
(144.3 .. 148.3) Core loss 0.4r.
1. oaE ·ifFl" e . REC.
RUN (RQD)
R 32 89
144.3 (81) .
to
148.0
R 33 100 148.0 -166.3 Joint spacing
moderately close.
very ~lose to 148 ... 0 (92)
(156.2 -161.5) Core loss 0.2'.
175. 0 -2 7 6 . 1 Numerous fractures cemented with
calcit~, minor chlorit~~ ~ore f~equently broken
along ~Ae.se surfaces by ~L~.ling.
.
153 .. 2
R 34
153.2
to
lS6 .. 2
R 35
lS6.2
to
16l..:S
R 36
161~5
to
166 .. 3
R 37
166. ;.
to.
171 .. 5
R 38
171 .. 5
to
176.3
R 39
176.3
to
lSJ ... 4
R 40
181.4
to
lSo~3
100
(83) r
96
(89)
100
(100)
100
(100)
100
(lOC)
100
(100)
100
(l00)
~--~----~--------~'
ACRES AMERICAN INCORPORATED ~__, ____ --rS<,_J~..::~.:;;..J .-
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PO(_Q CONSULT~NG ENGINEERS e-III&M ~Citac:IIFIWI!f!I•.-:JL~~!~~ c .. ' UO[d BUFFk.t..O , NEW YORK ANCHORAf~r , ALASKA
~Q~A~I~L~L~IN~G~A~.~E~-~P~O~-~~T~--------~------~------------------~-
8U81TNA MVI:JI=ICJ·Lii~IC PACI.JECT HOLE NO. BH•l i
tor ALA.SKA PCWER AUTHCIRITY SHE£TNO. 6 OF. 20 J
1-::SI~T:E..:;::=o;F:V=I=L=CANY==· o=N=· =N:;:. ::AB=u=TME=NT===-..::J:O,:::B,...:No:·~:::P::s::7::o::l::. o=s~\;:A:CR:E::s~>::o::s::2::so~4~=;,:(R~a:;M;;)~ I
L.--~~ .
DEPTH ROCX TYPE DESCRIPTION' ·7Jr'19 CdAE. I
RUN (~~<=c) •
~--~~--~c--------~----------------------------------~~----~----~--~
I I R 41 1"'0
186 .. 3 (9 :t}
to
191.5
R 42 100
191.5 (100)
to
196 .. 4
R 43 100
.196.4 (100)
to
201.5
R 44 100
201.5 (100)
to
204.9
R 45 98
204.9 (98).
to
209 .. 9
R 46 100
209.9 (100)
to
214.9
R 47 · 100
214.9 (90)
to
2.20. 0
220. 0 .. 221.2 · Joints oriented parallel to core 1 R 48
axis, with clay gouge. 220.0
to
225.1
100
(76).
R 49 100
225 .. 1 (100)
to
230.0
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CONSULTiNG ENGINEERS "aM C:SOw!!!s·~~!J..!!':!:
BUFFALO , NEW YORK ANCHORAGE , ALASKA
CIRILLING. I=IEJIQRT
BU.BITNA HVI:II=ICI.LIICTRIC. PRCI..IECT
fQr ALASKA I=IC:IW.I=I AUTHOAITY
SITE DEVIL CANYON N.. ABUT.t-mNT JOB NO. . PS701. 05
DEPTH ROCK TYPE OESCRIPTIONa
HOI..E NO. BJ!-1
SHEETNO. 7 . OF 20
(ACRES) 052504 (RSM)
•r..
LQ'F'" cafe. REC •.
RUN (RQD) ~----~-----------~l------------------------------------------~----~--~
R. 50 100
230 .. 0 (100)
to
235.0
R SJ. 100
235.0 (98).
to
240.1
240.1 -241.0. Minor clay along partings within R 52 100
~~-240.1 {94}
to
2.41 .. 8
2.41. 8 Co&Z! is fresh ·below this point .• RS3 100
24l. .. S (100)
to
2.46~9
R'54 ' ... ' 100
246.~' {100)
to ~
251..5
R 55 100
251.,.5 (91)
to
255.9
R 56 100
255 .. 9 (100)
to
260.5
260.5 -276.1 Joint spacing ver_. close to close. R 57 100
26.0~5 (100)
to
262.5
R .. SS 100
262 ... 5 (87)
to
265.£)
{' '
ACRES AMERICAN INCORPORATED t-----.....J;i!--,...;~~,-~,...
CONSUL.TlNG ENGINEERS IIIAM cc;_cc .. r~• ....... a.•-;r.~~~
BUFFALO , NEW YORK . . -ANCHORAGE • ALASKA
DRILLING AEPCAT
8U81TNA HYDRCJ.L8CTRIC PI=IQ.JECT
f-Jr ALASKA I=OWEA AUTHQI=IITV
HO(.E NO. BH-1
SHEETNO.-..L..OF. 20
SIT~ DEVIL CANYON N. A.SO'l'MEN'r JOB NO. PS701. 05 (ACRES) 052504_(R&M)
276.2
296.5
ROCK TY~
Lithic
Graywacke
l'!e ta Argillite
OESCRIPT10Na
(270.3 -274.2) Core loss 0.8:.
Dark gray to black;.fine to medium grained with
crystalline like texture. 3% to 7% green
ca-rbonate crystals, quartz rich. Fresh to
moderately weathered hard to very hard. .Joint
spacing very close to moderately close.
276.1 -280 ~ 3 Slickensided partings'.
285. 2 ... 286. 6 Core loss. 0. 2' .
(285 .3) 0. 1' layer of clay gouge.
Medium to dark gray, mottled bluish-gray locally.
Fine grained; modex;ately ha.rd to very hard, fresh
and competent. Minor sulfide mineralization.
Carbonates common.. -Joint spacing very close to
moderately clo.se. .Numerous healed joints
throughout.
----iii!. L~'" c . OF REC.
RUN (RQt))
R 59 100
265.6 (100}
to
270.3
R 60
270.3
to
1274.2
IR 61
1
274.2
. to
~76 .. 1
R 62
276.1
to
2au .. .l
R 63
280 .. 3
to
285.2
R 64
285.2
to
286.6
R 65
286.6
to
291.5
R 66
291.5
to
296.,0
R 67
296 .. 0
to
298.9
100
(79)
100
(95)
100
(82}
86
(71)
100
(84)
100
{82)
79
(34)
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CONSUI.TlNG ENGINEERS •aM c:sr.~tl!~!l~~
.BUFFALO , NEW YORK ANCHORAGE , AL..t.SI<A A; I(~
~~==~~~~~~----~--~--------------------~-CIRILLING ~EI=IORT
eu•rTNA HVI:2ACI.LECTRIC I=IPICI.JECT.
for AI.ASKA Pa.WEA AUTHCII=IITV
HOLE NO. BH;..l
SHEETNO. 9 OF-'.Q.
SITE DEVIL CANYON N. ABJJTMENT JOB NO. P5701.05 {ACRES) 052504 (RSrM}
329.0 Graywacke
(Breccia-
Conglomerate)
DESCRIPTION: L.-·--, • . ·~'"cORE. OF REC.
RUN (RQD)
296. 0 -298. 9 Shear zone, highly fractured,
weathered and slickensided. Core loss 0.6'
305.0 -311.0 Cor~ loss 0.3'.
(306.1-311.0) Joint spacing very close.
320. 0 -325. 0 Core loss 0 . 3 ' •
R 68
298.0
to
303.0
R 69
303.0
to
305.0
R 70
305.0
to
306 .. 1
R 71
300-..l
to
ll.l~o
!t 72
1ll.O
to
315 .. 7
R 73
315 .. 7
to
320 .. 0
R. 74
320 ... 0
to
325.0
R 75 Medium to dark gi~ay clay~y matrix containing 32S ... o
coarse J angular and sub-rounded clas·t.s of quartz, to
phyllite, argillite, and other rock types ranging 329.7
in size from 0. 01' \:o 0 .. 1 • and constituting SO%
to 60% of rock mass. Well indura:ted, hard to R 76
veey hard, competent 7 fresh.. Contains thin, 329 ... 7
layers (1 to 2 feet thick) of Argillite locally. to
Joint spacing very close to moderately cl<.se. 334 .. 7
Chlorite and carbonate coating on joints common.
Occasional healed joints. -
100
(85)
100
(90)
82
(68)
98
(71.)
100
(85)
100
(100)
94
(92)
100
(85)
100
(80)
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ACRES AMERICAN INCORPORATED -,----~~L·..;;;;;~ ..... -~"""-· -------------1
CONSU • .,.t.NG ENGINEERS •aM ..:::= ,_ ~TANT• INC.
"""' --,. 8116 •• ~~ :1r: .....
BUFFALO , NEW YORK ANCHORAGE , ALASkA
CJRILLING AEI=ICIAT
8U81TNA HVCACI.I.IIcn:IJ~ PRQ.JECT
tor ALASKA I=ICIW.t:l AUTHORITY -
HOI..~ NO.
SHEET NO.
BH-l
10. OF: 20
SITZ DEVIL CANYON N. ABUTMENT JOB NO. P570l.OS (ACRES) 052504 (R&M)
~.~ c~. "(;F'" REC. RUN CRQD)
DEPTH ROCK TYPE DESCRIPTtON'
R 77 100
334.7 (88)
to
339 .• 8
343.0 Joint with clay gouge. R 78 100
339.8 (96)
to
345.0
.R 79 (100)
345.0 (94)
to
349.7
-a ao 100
349 .. -(100)
to
355~0
R 81 100
355.0 (100}
to
359.6
R 82 100
359.6 (100)
to
361 ... 3
R 83 100
-361.3 (100)
to
363.4
R 84. 100
363.4 (100)
to
364 .. 4
R as 100
364.4 (98}
to
369.3
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ACRES AMERICAN INCORPORATED t-----"1"\_~J,.._ ________ -;
CONSU • "'"lNG ENGINEERS •aM car :-.&:raNT•, INC. .... J.. _ •••• ,. -..~ ~ .....
BUFFALO, NEW YORK ANCHORAGE ,ALASKA
.CII=IILLING PIEI=IQRT
SU.ITNA HVDAC.LECTRIC t=IRCI.JECT
for AI.ASKA 1=-'CJWER.· AUTHCIAITV
HOLE NO. _m_-l __ _
SHEETNO~ ll OF. 20 ·
SITE DEVIL CANYON N. ABUTMENT JOB NO. PS701.05 ..
(ACRES) 052504 {R tlM)
DEPTH
• /'
ROCK TYPE DESCRIPTIONr
373.3 to 373~6 Shear zone with clay gouge.
378.7 Clay filled joint.
L--..-dfE ·OF'" c . REC.
RUN (RQDl
R 86 100
369.3 (93)
to
373.6
R 87 100
373.6 (100)
to
378.6
R 88 100
378.6 (86)
to
381..5 '
381.5 .... 401.5
drilling.
R 89 100
Numerous healed joints broken by 381. ... 5 (lOO)
u,
3SG.S
R 90 95
(386.5 -391.4) Core loss 0.2•. 386 ... 5 {94)
t-.o
3~31! .• 4,
R 91 l 100
391 ... 4 (98)
'b)
J:9tS ... 5
R. ~~2 100
39EI ... 5 (90)
to
40!. .. 5
R 9:3 100
41)~ •. 5 (96) 406.0 -424.0 Joint spacing very close to close.
to
406 .. 6
R 94 100
406.15 {82.)
to
4ll.S
" 1 D • ., • • .. ' . ,; --~ . ( . . . . . .
>
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'A-~-~~~ ACRES AMERICAN INCORPORATED ._...,._.......__~r-'lf;i(~~l..---------------1 ..• ~-·-·.· CONsu l -J·tNG 'e.",N.GlNEERS •• M CC:W~LTANTa. INC. .·
.. 15.',' ~ • 1!!11--······ ............. ~." ...
BUFFALO • NEW YORK I ANCitORAG£ • ALASKA
~a=R~I=L=L~JN~.--G-.-A-E_P __ O_R_T_· ----~------------------~----~~
8Li.rTNA HVJ:JI=ICIBLECTRIC PRCJ..JECT HOLE NO. BR-l i
tor ALASKA I=IICIWI!PI AUTHCIAITV SHEETNO. 12 OF...l&l.. J
SITE DEVIL CANYON N. ABUTMENT JOB NO. P570l.os. (ACRES) 052504 (RSM) ·-1 :. L-::.:!~:=::::::::::::::::;:::==:::::=_ =-~~.=::....::::::::.::::=:-.!!:::!::!:=:::::;::::t..E!::.Nemf~~c~:.~ I! .
DEPTH ROCK TYPE DESCRIPTION: OF REC.
RUN tRQD)
(413.3-415.3) lU.ghly fractured zone~ R 95 100
411.5 (68)
to
415.3
R 96 100
415.3 {80)
to
420.3
(423.9 -424.1) Highly fractur.ed zone, trace .of R 97 100
claygouge. 420.3 (76)
"
to
.424.1
R 98 100
424.1 {96)
to
429.3
R 99 100
429 .. 3 (100)
to
434.3.
R 100 100
434.3 (98)
439.4
R 101 100
439.4 {9f',;
to
444.4
R 102 100
444.4 {100)
to
449.5
R 103 100
449.5 (100)
to
454.7
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CONSUl.TtNG ENGINEERS ~&Me'!. ~CI2_.M~a."H.a~~.!!1.!~
BUFFALO
1
NEW YORK ANCHORAGE , At.ASKA
CIRILLING I=IEJ:IQI=IT
· .U.ITNA MYI::2RC3.LIICTRIC I=RC.JBCT
for ALASKA t:te:~W•R A'lU,rHCIRrrV
HOL£ NO~
SHEET"' NO.
BH-1
13 OF_2o
s:ITE DEVIL CANYON N. ABUTMENT __ JOB NO. P5701. OS (ACRES) 052504 (R&M)
DEi:FTH ROCK TYP!
·L--~ ''SF'" REC. RUN (RQD)
OE:SCRfPT10Na
R ~·04 100
4S4 .. 7 (100
to
459.8
R lOS 100
459 .• 8 (100)
to
463.8
p_ 1.06 100
-463.8 (100}
to
468 .. 6
R: 107 100
46S.Ei (100)
to
47J .. ~
R. 108 100
473 .. 1 (100)
to
475.4
R !..09 100
475.4 {82)
to I 480 ... 5,.
R llO 100
4SO .. S (100)
to
4ss .. s
n
RUl 100
485 .. 5 (85}
to
488 .. 8.
R ll2 96
488.8 ... 491.5 Core loss O.l 1 • 488".8 (70)
tr..
491 .. 5
; .
ACRES AMERICAN INCORPORATED t-------'~-~1...;·[~::.· ~"""'·
CONSULTING ENGINEERS III&M CI~IOIMI~a .. .&:.~!J..!~
BUFFAlO 1 NEW YORK ANCHORAGE , ALASKA
SU.ITNA HVCIPICJIIUICTRIC .I=IRCI.JI!CT HOLE NO. sa-1
for ALASKA t:ICWER AUTHCII=IITV SHEETNO. 1 4 or,:..lQ.
SITE DEVIL CANYON N. ABU'rMENT JOB NO. 1?5701 .. 05 (ACRES) 052504 (UBIM)
ROCK TYP! DESCRIPTION;
530.4-534 .. 0 Core lo$s G.2'.
(533.5) Joint with carbonate and clay gouge.
• I
L~'" eOfk. .Of' • REC.
RUN tRQD)
R ll3 100
491..5 (92)
to
496 .. 7
R ll4 100
496.7 (93)
to
501..2
R ll5 100
501,.2 (100)
to
506 .. 5
R ll6 100
506 ... 5 (100)
to
Sll.S
R. ll7 100
su.s (97)
1::)
514 .. 8
R ll8 lOO
Sl.~.s (96)
to
51.9.9
R ll9 100
519 .. 9 . (94)
to
S2,S"!'l
R 120 100
525,1 (100).
to
530.4
R 121 94
530 .. 4 (89)
to
534 .. 0
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ACRES AMERICAN INCORPORATED t------.,-...~~·'-=~tllii:.;..l· _,__ ___ -~-"""i
CONSUL.TtNG ENGINEERS ~-~=:?~!.~~~~
BUFFALO , NEW YORK ANCHORAGE , ALASKA
= .-' CIAILLIN~ .REI=IQAT
aU.n-NA HVI:::IACIILBC-ft=IIC PRCI.JECT
for ALASKA Pa~"!!FI AUTHCI=IITV
HOL.E NO. A~::~;...----
SHE~ NO. 1!!.-~0F 20
SITE DEVIL CANYON N. ABtTrr&,r JOB_ NO. PS70l.OS {ACRES} OS25.Q.~-·-(fU2M)
ROCK TYPE DESl:RIPTrONt t.EN_;TH ctik.
OF REC.
RUN CRQDf
R 122 100
534.0 ( 98)
to
539.0
540 -750.2 Generally hard, fresh 1 competent. R 123 100
539.0 1 89\
to
l ' J
544.3
R 1.24 100
544.3 (100)
to
549.5
a 12s 100
549 .. 5 (100}
to
SS4';>5
R l.26 100
554 .. 5 (90}
to
559.7
R 1.27 lOO
559.7 (100)
" to
564..,8
a 12s 100
1564 .. 8 (100)
to
569 .. 7
a 129 lOC
569.7 (100)
to
575.J.
R. 130 lOO
575 .. 1-(92)
to
579.91
F------------------------~--------~--~------------------------------~ f
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ACRES· AMERICAN INCORPORATED t----......r~...,.,.j~s:z .......
CONSULTING. ENGINEERS ~&M c~c=.N!.~• .... u • ._L:Jl'~~~
BUFFALO I NEW YORK ANCHORAGE ' ALASkA
CIPIILLING J:IEJ:ICIRT
,8U.rrNA HVCIACI.LIICTABC J:IACJ..IECT
for ALASKA PCIW.PI AUTHQAITV
SITE OEV.IL CANYON N. ABUTMENT JOB NO. P570,1.05
DEPTH . HOCK TYPE DESCRIPTION&
(598. 7 -599 .1) Core shl5ttered.
HOLE NO. BH-l
SHEET NO. 16 OF~.Q..
(ACRES) 052504 {RESM)
1. ... ..-~ ·~·l"''c
OF R£C.
RUN (RQD)
R 131 100
579 .. 9 (~00)
to
585,.1.
R 132 lDO
585.~ (100)
to
590.1.
R 133 100
590.1 {100) \ .
t:o
595-.l
~
R 134 100
595 .. 1. (100~)
·to
599 .. )~ ~
R t.3S 100
59S,..l (98)
to
6·.0~\ .. 2
R 136 100
6Q4 .. 2. (100)
to
609 .. 1.
R 137 100
609 •. 1 (100)
to
610 .. 5
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R 138 100 ' I 6~~ .. s (100) I :
614.8 . . ....
R 139 100 J.
614.e .croo) . ..
to· ( . ··
619.8
1
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..,__.....__..._.------~-----· ___ ---. .. ________________ I ....... r.J i
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BUFFALO , ,NEW YORK ANCHOR~\GE , ALASKA
I:JPIILLING AE-~CI"""""···.......,R"""'""T~.· --......&..-------------------~~
IIUBITNA HVQRCIIILECTRIC PRCI-ii!CT
for AL.ASKA J:f~WI!PI AUTHCIJ11TV
HOLE NO. .:ti-~ .
SHEET NO. 17 OF. 20
SITE DEVIL ?NYON N. ABUTMENT JOB NO.
n
P57ol .. os (ACRES) o52So4 tRaM)
ROCK TYPE CESCRIPITION•
~--~~-~---------+--~----------------------------------~-
(621. 6 -621. 7) Core shattered.
I
-,.: ;. . i < • • • ~ ,_ •
-.,.
L~·" cdf!. OF REC.
RUN (RQD)
R 140
619.8
to
621.7
100
(95}1
l
R 141. 100
~621 ... 7 . (98)
to
626.8
R 142 100· ·
626.8 (100)
to
631 .. 7
R 143 100
631.7 (100}
to
636 .. 7
..
R 144 100 ~}
636 .. 7 (lOO)
to
641.6
R 145 100
641 .. 6 (100)
to
645 .. 2
R 1.46 100
645.2 (.100)
to
•sso .. o
--·
R 147 100
650 .. 0 (1001.
to
655 ... 2,
R 148 100
655.2 (96)
to
660.4
'.~-. .
_../' ,.._...._._....~---...-----:-_,__ _______ ____,I
ACAES AMERICAN INCORPORATED r-------.r~"""';;~..;;;~Sl~-· ____ _, ________ ._ .... ! I
CONSUL..Tl~G ENGINEERS !'~~-~T~NT!.1J~. !_,_
BUFFALO t NEW YORK ANCHORAGE , ALASKA
• .,.,.......__,....._ ________ ---t I
8UiiaTNA HVDI=Ia • ._.CTI:IIC PAC1.JBCT -HOLE NO. _s_a.....,-1.__ I}. -
for ALASKA I=ICJWBR AUTHCJRITV SHEETNO. 18 OF. 20
SIT;: DEVIL CANYON N. ABUTMENT _ JOB NO. P570l .. 05 (ACRES) 052504 ,.{RaM)
1
-
CRILL!NG REI=ICAT
DEPTH DESCRIPTION&
L--.X. ,
~----~--------~--""' ____________ _ ·OF''" CQI\.~ a·
-------+-R_u_N.....,· t_~E_o~_·)...,. .:
R 149 100
660.4 (96)
to
665.5
R 15.0 100
665.6 (96)
to
670 .. 8
R 151 lQQ
670.8 (~00)
to
-~75 ... 8
R 152 100
675 .. 8 (96)
tc,
680 .. 5
R 153 100
68Q.5 {74}
to
683.9
'R 154 88
683.9 (82) ( 683. 9 -690. 0) Core loss 0. 7 ' .
to
690.0
lR 155 . 100
690 .. 0 (lOO)
to
655 .• 2
-'P.: 156 100
69~ 2 (98)1 r _...., •. I . a • 7~0.5
l
,;, n 157 ·loa
7tlO. 5 !98)
to
70S!ti
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~------~~~.,,~~r~~~·~.~~-------: __________ ~:~ ACRES AMERICAMiNCORPORAT!D ~V'·
CONSULTiNG ENGiNEERS ••M .r:c;....e-=~•.!!·t.~A!_'::!.~~!,.!~
BUFFALO , NEW YORK ANCHORAGE , ALASKA Mlm ~~~-~~------------~~----~------------~~-----------~~ L1PIILL.ING REPCRT
su•n-MA HVCSPIC1•L•C-n:tiC -I=ICLJ.CT
for ALASKA I=ICW.II AUTHCPIITY
SITE DEVIL CANYON N. ABU'l'MENT _ JOB NO. · P570l. OS
OESCRIPTtUN•
HOL.E NO._BH_-.-.1 ---.
SHEETNO. 19 OF~
(ACRES) 052504 (RSM)
l.~ll't ~~
OF REC.
RUN tRQll) ~--~----~~. --------~~--------------------------------------4---~~~
l
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(727. 1) Jo; .a.t with clay coating.
(731.8 -732.5) Hitb.l.Y fractured zone.
(733. 0) Joint wi t.Ji f:J.ay gouge.
(737. 4) Joint With\'' clay gouge.
R 158 100
705.7 {100)
to
110.6
R 159 100
710 .. 6 (100)
to
715.7
1.00 R 160
715.7
to
12l.~O
r ·r8) 1
J • 1 " R J.6l(l00
121"'0 · (lOO)
to
725'"4
~. 1'62 lOO l
725 .. 4 (95)
to
727. 4,
R 1:63 lOO
121 .. 4 (91)
to
731.-a
a 1.~4 lao
131-.8 (SS)
to,
137.1.'
R l6S 100
1l7.l (91)
to
741 .. 5
100
(98)
R. l66
74l .. S
to
745.7•
_ . ·-..... c~ _____ ' _ ... ..._..._. ...........-.L---....~. ... ~~I
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~~-c----~~;.......__··.. ---------------I
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ACRES AMERICAN·tNCOffPORATED t------rt.f:~ .
CONSULTiNG ~GINEERS JII&M z:!~A~!fh.!!'5:
BUFFALO , NEW YORK ANCHORAGE , A~ASKA a·
i 8U81TNA k~'YI:II=ICJEUECTMIC PRD.IECT .HOLE NO. _B_a:_-l...___
CRIU.ING t:IEPCIRT
I .. ._,+.;
for ALASKA ~WI!Pl AUTHQRITV SHEETNO. 'Q OF-l.O..
SITE DEVIL CANYON ·N.;· ABUTMEN'r JOB NO~ -· P5701.05 (ACRES) 052504· (R6M) ~~======~======~~~~====~~' ~ ~o~.~ L~OF.~a.i Wiilrl" '"' ~ • ,,... DESCRIPTION• ,. . . J----+-------+---------------------=-----.·--~R-UN~~<~.;..;~;,;;~~~ : _ _'
750.2 .. End o£ Hole
..
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745.7 (87)
.. . .. . ·.· l
to
750.2
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ACRES AMERICAN INCORPORAT~O
CONSULTING ENGJ~.EERS
BUFt:'Al.O 1 NEW YOR-k
DRILLING RI!J:ICIRT
SLiSITNA HV~AC1EL.ECTAIC P~CI.JECT
for AL.ASKA POWEI=I AUTHCJAITY
HOLE NO. BH-2
SHEETNO. 1 OF18
SITE DEVIL. CANYON NORTH ABUTMENT JOB NO. P5701.05 {ACRES) OS*SOf! _ (R&M)
CONTRACTOR __ THE __ o_RI..,.-LL~IN ..... G_,c;;;;.oo .... MP-.MY;;;;;;;;;,;....___ STARTED l;.l: 00 b.M, Seot. ~0-;_....,__,.19 SO.--
Set)t. is 19 a_o
ORlU..lNG
METHOD
L.OCATIQN:
---------.-·..-------.FINISH ... EO..,_ ___ M.
SOIL. ·CAS~G ADVANCER CASING OIAM# NW 4"-:r..o.
ROCK DIAMOND. CORE DR.'ILLZNG CORE OIAM. .. N$l - 3 <l.:.J.-i .... "....,) -~-
LATITUDE N 62° 49'S. 737" ELEVATIONS: DATUM
DEPARTURE w l49c 18' 21.1?9" DRILl. PLATFORM -------·........-.-~
BEARING -oo · . GROUND SURFtOCE l21~._<t,,..: --
JNITJAL DIP 600 ROCK SURFACE _., 1.21~~' · . e7·-~ ' .f*q-.. ~ OTHER DIPS BOTTOM OF HOLE--~-.-.. ~ . ·""._
WATER TABLE 12U~r-.. ---
~----~------------~------------~--~------------------------~~--/~~~ l.ENGT'H ·/·
OEPTH ROCK TYPE OF CORE. ctu· u REC,
·n •-" ( RQO.)
o.o Overburden Da,rk brown organic silt wi tll trace light gray
ash, angular cobbles ..
2 .. 0 Argillite
·.
0. 0 -2 ... 0 No samples takeD..
Sray, siliceous, very fine graittf!d. Thinly
bedded, with laDiina.e oriented 55° to 60° to core
axis. Veey hard to moderately hard. Fresh to
slightly weathered 1 with· iron-oxide staining on
fracture and joint. surfaces. Joints very close
to closely .spaced. Pyrite cnbes corD"mOn.
Occasional quartz intrusions.
(6.0 -10~5) Highly fractured interval, friable
10 .. 5 "" 16.0 Silvery sheen.
phyllite. Laminae offset:.
Grading into
(RSMl
... -" ' ' .. ~ .
Run l 95
.2.0 (53)
to
s .. -o
Run 2' 40
6.0 (0)
to
.1 .. 0
Run 3 13
.71>0 (0)
'tO
S .. l
Run 4 79
a ... l co)
to
··1~).~5
)
.I
. I
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ROCk TYPE
16 .• 0 Phyllite ~ 6 100 i
Dark gray, thinly bedded. Wavy lami.nae oriented 16.0 (92) ·.1·.·.'
at 40° to 60° to core axis.. Very hard to hard. to
Fresh to moderately weathered, with Iron-staining 21.0 ·1
on joints-and fracture. surfaces . Joint spaci?:lg •
~;;~ue:;os~y~~e-mod':t~~:ly q~::;· ~Tra~:al:~ ~O 7 ~~~) ·~
fractures. , to ·
21.0-26.0 Slightly fissile.
28.0 a 33.0 Thin quartz veins~
brecciated zone at approximately 31 feet.
Healed
26.0
Run 8 100
26.0 (90)
to
28 .. 0
atm. 9 100
28.0 {90)
to
33.0
Run l< 100
33.0 -3&.0 Argillaceous zone. Fractures 33.0 (92.)
oriented at app~oximately 0° to core axis. to
42~0 -46.9
close.
. 38 .. 0
Run 11 100
3.8 .. 0 (92.}
to
42.,0
Joint spac.ing c·l "">Se to mode~ately Run l~ 100
..42 .. 0 (lQO)
to
46.9
l
.R.un l~ 100
46.9 \'96)
to
Sl .. S
51 •. 8 -57.1 Gl.'ay-Wacke inte:rmixed~Wi.th phyll.ite. RUrtl4
51"8
to
57.1
lOO
CLOO)
: ,-~
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CONSULT IN~. ENGINEERS Jlt&M '!!'.!!!.IL!~!~!'S:
BUFfAlO • NEW YORK _ ANCHORAGE , ALASKA
CIRILLING I=IEPICI&:IT
&UDITNA HVat:~a•t.SCTI=IIC I=IRQ.JI!CT
for ALASKA I=ICIWER AUTHCPIITV
HOLE NO. _.B-.H_-2 .... · --
SHEET NO. 3 OF. 18
SITE DEVIL CANYON N. ABUTMENT JOB NO. P570l. OS {ACRES) 052504 {R&t.~)
DEPTH
91.6
ROCK TYPE
Argillac~ous
Graywacke
OESCRIPTIONli
71.9 -76.8 Inte~ixed argillit~.
L.--. .:f.t_ ·QF''" Com:. •. . . REC ..
RUN . tROD)
!Run 15 !00
57 .l . (100} -~·
to
62.1
'
!Run 1:6 100 f
62.1 {98)
to
67 .. 0
!Run l7 lOO
67.0 (100}
to
71 •. 9
Run lS 100
71,9 (100)
.tQ:
76 .. 8
Run ls< 100
]16 .. ~ (80)
jars
81.8 -86.9 Predoruin~ntly phyllite. ~!a\y and Run 20 100
irregular bedding at 50° to 60° to core axis\. Sl. .. S (96)
Closely spR.ced joints.. to
86 .. 9
86. 9 "" 91. 6 Joint spacing very close to close. Run 21 lCO
86 .. 9 (83)
to
91 .. 6
Brown, folded, very hard and fresh. Joint Run 22 100
s{'acing very c11lse to moderately close.. Pyrite 9~ .. 6 (89}
common. Some quartz int.rusioW$ . A:rgilli te, to
laminae oriented at 4oc to 50° to core axis. 96 .. 9
Run 2.3 100
96.9 (96)
to
101.7
--.,.,..__..._ ____ ~---.-,~·-~----~:...__~-.r-->oi-f: . ..,; ___ _,~.'!'~". ------------------..\,--
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AI. III Co ~~·u· ':TtNG r!'N·. G. a·NEEc.s JlaaM cc • ........_T~Ttl, aNC. n..~J 1. ~ n • • s • ....--.~-·ll A....._ ,.,... .....
SUFFAl.O ,. N~W YORK · ANCHORAGE. • ALASKA
CPIILLING,_R ..... -~E~P-0~ • ..,.R ..... T......,_ ___ ...__ ________ _.. ___ -.,., I
8U.n-NA ·HVCIACIELECTI=IIC PAO..JECT HOLE No._BH_-_z__ "~-··.)! ..
for ALASKA I=ICIWI!r-1 AUTHCJAITV SHE£TNO. 4 OF. 18 iiJ
SITE OEVn CANYON N-. ABUTMm4T JOB NO. P5701.05 (ACRES) 052504 tR&&M) ;
OEPTH ROCK TYPE
112. .. 0 Argillite
DESCRIPTION a
107.9 -112.0 Rock less competent,
f~actured and. broken by drilling.
(109.5 ... 112.0) Core loss 1.5' .
l.~c&k
OF REC.
RUN (RQDJ
!Rt:m. 24 100
~01.7 {100)
to
[los .. o
!Run 25 lOO
lOS. 0 (93)
to
~07.9
highly ~un 2f· lao
P.o7. 9 , (94l
to
~09 .. 5
!Run 27
109 .. 5
to
lll .. O
40
(0)
Gray, vt::;ry fine grained.. Generally very hard, IRun 28 100
fr.iable locally ... · Fresh to s_ligh.tly weathe_r.ed, .~!J.-i 122~ 0. (100)
with trace of Iron-staining and some chlorite and to
calcite scale in joints and fractures. Very 2t.f 5
close to ·::losely spaced joints. Occasional ·~
quartz intrusions. 29 100
.1.4 .. 6 (96j
114 .. 6 -119.4 Some int.erlayered graywacke. to
Slickensid~s at 117.5'. ~944
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healed with bluish quartz. Clay on vertical ~~9 .. 4 (79) ' ;
joint"" Cora loss 0 •. 3' * to , ..
~23.2
125 • 9 .. 13~ o 0 Poor recovery. Coxoe badly
by drilling" Core l.oss 1..\. 1 feet.
~U!l 31 100
~3: .. 2 (~00)
to
.. .;
I'
~~5.9
ground ·tun 3. 2 25~9
36 I
(o>. i ,:
to
'32.0 II lt -----...-........ --~--llllliollo ......................... .....,..,.... ..... ______ .ir.toi ..... lllllli' ·u.:..····"""'"""•*--"""'-__ or.Oioolol ____ .,., ____ .~:·..c~; ,~
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CONSUl.TlNG ENGINEERS Jlt&M C::c::r~~! .• """~_.~~~~!J..!~
BUFFAl-O , NEW YORK ANCHORAGE , ALASKA
QI=IILLING REPQAT.
•u•n-NA. HVDIICI.U!CTAIC PACiwJECT
for ALASKA POWER AUTHCIAITY
HOL.E NO.-BH;:;.-.-:2:;....._
SHEETNO. 5 OF-l.a.
SITE DEVIL CANYON N. ABUTMENT JOB NO. P5701.05 {ACRES) 052504 (RaM)
DEPTH RO:K TYPE
145 . 4 Graywacke.
CESCRIPnONa
137.0 -140.3 Joints moderately close spaced.
140.3 -145.4 Oolitic zone. Numerous soft,
White., noncalcareous Oolites in dark gray cal-
careous argillite matrix.
(141.3, 144.0) Slickensides.
l..a;!'NTl"' . eek.
OF R!C..
RUN (RQD)
jRun 33 100
·~32.0 (100).
to c
~35 .. 0
!Run 34 100
135.0 {90)
to
137.0
Run 35 100
13.7.0 (76}
to
140 .. 3 .
Run 36 100
140.,3 . (81)
> to .~
143,4
Run·37 lOO
143.4 . {90)
to
145 .. 4
Dark gray, medium to coarsa grained.. Mode.rately .~~ 38 10.0
hard to soft, fre.sh . to moderately weathered.
1
114·. 5 .• 4 (l·OO)
Numerous cream-colored, rounded, siliceous blebs to
(greater than 3 mm) throughout. Joint spacing ·147-.5
very close t~ ~oderately cl~se.
147 . .5 -152.0 Cor.e loss 0.2'.
Run 39 ss
1.47 .. 5 {95)
to
132.0
152 .. 0 -155.0 Gouge zone. Moderately hard to Run '40 93
soft, moderately weathe.red. R~.sidual soU 15~.0 (01,.
present... Very friable. Core loss 0 .. 2 1
• · to
155 . 0 -17 8 . 6 · Dark gray to ere en, w:ith cryst~ 1s
of tJypsum(?) [up to 5 mm diameter] and quartz.
Abundant biotite .mica note~~ Moderately hard,
$lightly to moderately weath\.:' te&.
(155 .. 0 -160.0) Slickensides ..
155.0/
RUn 4lfl00
153 .. 0 1 (92)
to ] ,
160 .. 0
Run 4.~ 100
160.0 (93}
, 'to
~65.4
,........_._ ________ . --..-------------.I
--
'A~Il~ ACRES AMERICAN INCORPORATED r-----J":-""aJ-=·'::-~'CCIN.ilui..TANTa.•~ ,,-_---
CONSULTING ENGINEERS • • ·--··~., .. ""-~-·-
BUFFP.LO , NEW YORK ANCHORAGE , ALASKA
as:~aLLINra-,,.~=~-e-~=~-a-A-T---~--------------; I
SUeiTNA HVI:IRCI.LBCTAIC J:IAD.JIECT HOLE NO. BH-2
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tor .ALASKA I=ICIWER AUTHCRITV SHEETNO. 6 OF. 18
I--
SITE_ DEVIL CANYON N. ABUTMENT JOB NO. PS701.05 (ACRES) 052504 (RSM)
DEPTH ROCK TYPE DESCRIPTION: r~tl ~·----+-------------~------~------------------------------------~---+--~ ~
182.8 Interbedded
Graywacke
and Argillite
178. 6 -182. 8 Highly fractured, some
on joint. surfaces.
~ 43 ~00
165.4 (98)
to
i70.5
~,un 44 100
1170.5 (98)
to
11.75 .. 6
[Run 45
li-75 .. 6
to
~79 .. 6
100
{90)
clay gouge •f:un_ 46 100
78 .. 6 (56)
to
lS~ .. s
Run 4i 100
Interbedded graywacke and dark gray, fine grained il9l.8 (93)
argillite. Hard to moderately hard. 'Fresh. to
Joints closely spaced. Many healed fractures llSS. 9
filled with ca1~ite, some quartz.
!Run 48 100
ll85 .. 9 (100)
to
190 .. 8
!Run 49 lOO
~.90 .. 8 {100)
to
11.93 .. 8
iRun SO 100
~93.8 (lOO}
to
ll98.9
!Run 51 100
11.98.9 (100}
to
;!03.4
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CONSU • ·:riNG E~.~INE=-RS lllt&M c:a::!F ...._,.AN~'11. ttte:. .. ... ''~ . .... ,_ ............ , .• -··-·
SUFFAL.O , NEW YORK ANCHORAGE t .ALASKA
DAILLING REJ:ICIRT
SU.ITNA HVCIRCJI!LECTRIC PAC.JBCT
f)~ AL.ASKA J:ICWBR AUTHC1AITV
HOLE NO • ..;::;B;:;;H-..... 2..._, __
S~EETNO. 7 OF. 18
SITE -. DEVIL CANYON· .N. ABUTMENT JOB NO. P5701. OS (ACRES) 052504 {RaM)
DEPT'H ROCK TYPE
236.3. Argillite
DESCRIP'MON:
213 .. 0 -213. 6 Broken and healed zone.
i..~'Tn c~
'ROUFN REC.
CRQD)
Run 52 100
203.4 (100)
to
208.6
Run 53 100
208.6 (100)
to
2~1.7
Run 54 100
2ll.,.7 (96)
to
2~6~9
~ 55·100
2,26,..9 (lOO)
to
aao .. 4
220.4 -231.2 Joint. spac.itlg close to moderately :Run 56 100
close. 220 ... 4 {98)
Gray, very f~ne grained. taminae oriented 50° to
core axis • Oriented, platy minerals evident.
Vary hard to moderately hard.. Fresh. Joint
spaciltg very close to mtidera'tely close. Traces
of pyrite (cubes), and minor quartz in irregular
veins.
226 .. 0
Run 57 100
226 .. 0 (100}
2,31.2
Run. SS 100
231 ... 2 (100)
to
2.36 .. 3
Run 59 100
2.16,.3 (100)
to
241.0
Run 6d 100
241.0 (97)
to
244 .. -7
~-----~------------------~~--~-------------------------------------~
ACRES AMERICAN INCORPORATED ._,_ __ __.. .... ~"'~~:.._ ______ _,_---t
CONSULTING ENGINEERS !"aM. c:!_~.!.~.!~!'!::
BUFFALO , NEW YORK ANCHORAGE , Al.AS~A
D~ILLING REPORT
8UBITNA HVi:Jt:ICIELECTAIC PACI..JECT
for ALASKA PCWI!I=t AUTHOI=IITV
SITE DEVn. CA.l\IYON N. ABUTMENT ~ JOB NO~ P5701. OS
DEPTH ROCK TYPE
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OESCRIPTlON:
260.0 -262.5 Core loss Ow2'.
270.5 Joint w.ith clay gouge.
274 .. 7 -281.8 Core loss 0 .. 4' ..
HOLE NO. BH-2
SHEETNO. 8 OF. 18
(ACRES) 052504 (RflM)
·-
'----.Y.t-''OF'"C~
11'!11 REC:.
nUN {RQDl
!Run 61 100
244.7 •:,,;~00}
to
249.8
Run 62 100
249.8 (100)
to
255.0
Run 63 100
255.0 (100)
to
260.0
~64 92
260.0 {SO)·
to
262.5
Run 65 100
262 .. 5 (92)
to
267.3
Run 66 100
267.3 (82)
to
269.5
Run 67 100
269.5 (100)
. to
274.7
Run 68 96
ll74. 7 (86)
to
277.5
Run 69 93
277.5 (81)
to
281.8
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• CONSUl.TlNG ENGINEERS !"•!!!C!!'~~~!l.!~
BUFFALO , NEW YORK ANCHORAGE , AL.ASKA
Clt=IILLING I=IEPOs:IT
8U81TNA HVI:IJ:ICI • ._.CTRIC P"C.JECT
for ALASKA PCWEI=t AUTHCI=IITY
HOI.E NO. BH-2
SHEETNO. 9 OF: J.S_
SITE DEV:I:L CANYON N. ABUTMENT JQB NO. P5701.05 {ACRF.S} 052504 {RBIM)
DEPTH ROCK TYPE
300.0 Joint with clay gouge ..
301.7 .. 306.7 Ql.Ulrtz intrusion parallel
bedding -constitutes 15% of the interval.
L-'-dfE_ ·~F'''" C 0 REC.
RUN (RQD)
Run 7C 100
281 •. 8 (~00) ,.
to
287.0
Run 71 100
287.0 (100)
to
292 .. 0
Run 72 100
292.0 (100}
to
297 .. a I
Run 7~ 100
297 ... 0 (100)
to
301~7
tc Run 74 100
30~ ... 7 (100)
to
306 .. 7
Run 7.5 100
306 ... 7 (100)
to
309.4
Run 7E 100
309 .. 4 (100)
to
3lO~S
Run 7i 100
310 .. 5 (100)
to
315.5
Run 7E 100
315 .. 5 .-kOO)
to
318 ... 7
·•
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CONSU ··:rtN.G ENG· Eeo'!!'\s ••M ccr •ICTANTa. JNC.
a. . aN '"'"' .,..,.,_ -· .. ·~"·· -· --·-BUFFALO , NEW YORJ(; ANCHORAGE· , A.l..ASKA
Dr:IILLING REPORT
BUBrtNA HVCII=tCBLECTRIC I=IRQ.IECT
for ALASKA JIOWER AUTHCIRITV
HOL~ ~;o. BH-2
SHEETNO. l.O OF. lS
SITE
DEPTH
f
I
JOB NO. P570l.05 (ACRES) 05250L-.{RaM)
OESCRIPTtON: L.~T" cOlE.
OF REC.
RUN (RQD~
3.18 .. 7 -325.8 Wavy laminae, generally oriented Run 79 100
at 45° to 50° to core axis. 3lS. 7 {97)
to
322.5
Run 80 100
322.5 (100}
to
325.8
327 . 8 -329 . 0 Inte~bedded graywacke
contorted quartz st::ingers throughout.
nume.rous Run 81 100
325.8 (97)
to
329 .. 0
329 . 0 -336 . 4
throughout.
Contorted quartz stringers R.un 82 100
329.0 f (96)
to
(331.5 .. 336.4) Co1:e loss 1. 6'.
336.4 -365.6 Intercalated graywac~ and
argillite, dark gr.ay to light grayish brown..
Ir:z:egular, wavy laminae at 50° to core axis.
Very ha1:d to ~rd, fre:sh, joint spacing very
close to moderately ~lose.
( 341 . 5) Joint with clay gouge.
331.5
Run 83 67
331.5 (57)
to
336.4
Rl.Jn 84 ... ...,~
C.· . .!
336.4 (~0)
to
338 .. ~
Run 85.100
338.4 (100)
to
342.0
Run 86 100
342.0 {100)
tc
. 346.0
Run Si lOO
346.0 (100)
to
3Sl.l
~---------~--· ----~~~--------~--------------F,,,--------~----~--~--~
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BUFFALO t NEW YORK ANCHORAGE , ALASkA 1~~-*'---~-~ , J A~lfl
CIAILLING REPCAT
, .U.ITNA HVaRCUUIC-rt.'11C J:IRCI.JIICT
for AI.ASI<.A r;cw•A AJ..JTHCIPIITV . .
SITE DEVIL CAblYON N .. ABUTMENT JOB NO. P5701.05
HOL.E NO. -=a~g~-2._ __
SHE£.~ ~0. ll .. OF. 18
(ACRES) 052504 (Rt\M)
iLL I L.C:-~ ~0~----~----mJ-CK--TY~~--~-----J·~--O-E_S_C-RI_Pn __ O_N_'------------------------------~~·-~o_F_'''~"R_E_c~: ..-_ ;-RUN ( ft!QD)
. '
Run Sf: 100
351.1 {100)
to
356.0
Ru.n 89 100
356.0 (l.OO)
to
360.8
Run 90 100
360.S • {98)
to
365 .. 6
365.6 -385.1 Trace of pyrite witb. cubes to Run 91 98
S mm. 365.6 (96)
(365. 6 -370. 9) Core los.s 0. 1' .
(37 4. 4) Clay filled joint.
385. l -390.3 Deformed laminae.
to
370.9
Run 94: 10.0
370~.9 . {85)
to 1
375.0
Run 9~ 100
375 .. 0 {100)
to
380 .. 0
Run 9< 100
380 .. 0 (lOO)
to
385 .. ~
Run 9: 100
385 .. ~ (99)
':o
390.3
Run 9E 100
390 ... 3 {94)
to
.395 .. 5
ACRES AMERICAN INCORPORATED r------=-~~~'-·· .!l.: ... C'""''..._.._.
C'ONSU 1 ·:rt.N' (,J ~~·~I.NEERS JII&Me!lC -CI~fM ....... ._..i:i..:::&..TANTS, INC.
... 411 t;.l~ ........ ?. ---~ . .....-ve-~ ...
BUFFALO ' NEW YORK ANCHORAGE I ALASkA
I I
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CII=IILI.ING PIEPDI=IT I ,·.
su•ITNA HYI:2ACJ.LI!CTAIC I=IRD...IECT HOLE NO. sa-2 ;
for .. ALASKA t=lr!IWBPI AUTHCJr:IITV SHEET
05
N
2
0
5
•
04
12 OF. 18 1-. _ ....
SITE DE'i!IL CANYON N~ .. ABQTMENT ·· JOB NO. P5701.05 (ACRES) _ (RSM) .: I-.:!.:..:..:;::::::::::::=:=:==-::=::==-~~:_:::::::::::::::~~==::::::::=:;=:,L4 1-.
DEPnf ROCK TYPE Dt:SCRifl'f10Ni
400.7 -406 .. 0 Core. loss 0,1'.
406. 3 Clay gouge on joint.
L~=rHcOffE.
OF REC. I· RUN (RQO)
Run 9i
395.5
to
400.7
Run 9E
400.7
to
406.0
Run 9S
406.0
to
100
(96)
98
(91)
100
(94) .
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411.0 -444.9 Argillite grading into phyllite. R l:t:JO 100 1 ·. 1
•
Q~rtz intrusions common. Chlorite mineraliza-~l~,o I (100) I ,
tJ.on.. J to l i
4l~ .. o
(426.6::. 431..9) Core loss 0.4'.
· r:::l 100 1
-
416.3 (512) .,
to
421.3
R l:02.
4ll.3
to
426 ... 6
a l03
426 .. 6
to
431.9
R l04
431.9
to
437 .. 2
R lOS
437 .. 2
j to
44l!.2
100
(100)
92
(100)
lCO
(95)
100
(100}
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. UO(d BUFFALO ' NEW YORK ANCHORAGE J ALASKA A
PD£_ P__ ;CONSUL.TtNG ENGINEERS .. &Mc.oae:.~.~~~!!,.!~ j
~======~------------------~-~.-------------------~·------------~~ I:IPIILL.ING AEPCAT -. ----------
i
BUBITNA HVCJRCI8LEI;TAIC Pt=ICI.JECT
for ALASKA ll:ICIWEPI AUTHQAM'V
HOL.E NO. BR-2
SHEET NO. 13 -OF ... l 8
SITE DEVIL CANYON N .. ABUT.:"-1ENT JOB NO. P570l~OS {ACRES) 052~04 {R&M)
OEFf""ri
444.9
ROCK TYPE
Graywac2te with
Arg~lli•::e
li.IC:SCRIPT10N:
Graywacke .interlayered with (varying amounts)
argillite. Dark ~·ray 1;.o brown, fine grained.
Very hard, fresh... joint spaccing v.eey close to
close. Minor qua~ '? intrusions with chlorite.
~-~~" cek. OF REc.-
RUN CRQD)
R l06 100
442.2 (!00)
to
444.9
R 101 1 ioo
444.-9 (100)
to
450.0
R 108 lOO
450 .. 0 (94)
to
455.3
R 109 100
4?-S .3 (100) I
to 4e0.21 . .
IR 1~0 100
460:-.2 -(lO(J)
to
465.31
R l.ll. 100 I
465.3 (lOO)
to
470.3
R ll2 lOO
470.3 (96)
to
'475.0
475.0 -492.5 Numerous healed fractures filled ~7 ~~ ci~g)
with calcite. Argillite has wavy laminae.
0
to
477 .. 3
R ll4 100
477-.3 (100}
to
4Sl.9
~--~~----L--1--------~----------------· ~-·~~~-
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ACRES AMERICAN JNCORPORATED t------r"fi2~JS:Z'------------I
CONSUL.TlNG -ENGINEERS JIIAM c:e,•.~!~NT~~
BUFFAL.O , NEW YORK ANCHORAG.E , ALASKA
r.:IRILLING REPDRT
8UBITNA HVnt=~a•&.aCTRIC PAQ.JECT HOlE NO. _s .... a:-..... 2--
fcr ALASKA PCWBI=I AUTHCIAITY SHEEiN~. 14 -OF-18
SITE DEVIL CANYON N. AB~ JOB NO. .PSiOl .. OS _.,(ACRE~~ 052504 (RtlM)
DEPTH ROCk TYPE
495.4 Argillite
DESCRIPTION:
(491.8 -492~5) Shear zone with clay gouge~
494.4-498.0 Joints with. clay gouge.
-·-0
Dark gray argillite with distortedt irregular
laminae.oriented appro~imately 45° to 50° to core
axis. Fresh, very hard.. .Joint spacing very
close to close. Frequent irregular quart:z.
intru$ions with some chlorite~
498.0 Joint with clay coating at 45° to· core
axis.
·~..--diE. ·~·"c -OF REC ..
. R-IJM < RQD)
R llS 100
481 .. 9 (86)
to
495.4
R 116 ,lQQ
485.4 {96)
to
490.3
R 1~7 100
490 .• 3 (59)
to
492.5
R 118 100
492.5 {13}
t.o
495 .. 4
R ll9 1.00
495 ... 4 . (90)
to
498~5
·R. 120 lOO
498 .. 5 {100)
to
503.c8
R 121 100
.503.8 (100)
509.1 -519.1
throughout..
509.~ I
Irregular fragments of gray..,.;cke R 12.2 . lOO
509 .. ~ (88)
to
51.4.0
R 123 100
514.0 (90)
to
'519 .. 1
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coNS· u· • ·:r.tNG ENGINEERS.· ··•M c= .-.a..TANT•.•rc. ._ •• a __ • .,. • ...,--··-
BUFFALO , NEW YORK ANCHORAGE , ALASKf\ 1
J:I,_ILI.ING AEPOPIT ·-j
.U.ITNA MYCRC.LIICTPI~C t=IAC.JECT
ftlr ALASKA ·I='QW.R AU-n-ICI=IITV
HOLE NO. BH-2
S~EET NO. '1 ~ 0 F. 18 .
SITE DEVIL CANYON N. ABUTMENT JOB NO. P5701. OS (ACRES) 052504 (R&M)
DEPTH DESCRIPTION:
529 • 0 J oi' . ..-i.th. clay gnuge ~
L - -~·~C~
OF REC.
RUN ·tRQCi
Rl24 100
519.1 (~00)
to
524.3
R 125 100
524 .. 3 '94)
to
. 529.5
~
529.5 -534.7 Sligh.t altBration zone associated R 126
~ith quartz vein. 529.5
to
100
{~7}
534.7 -538.3 Core loss _0.3'.
534.7
R l27
S34,.7
~0
538 .. 3
91
(83}
R 128 100
538 .. 3 (78)
to
542 .. 0'
1 542. o .. ss 1 . 1
l axis.
Laminae very irregular to core R US 100
542 .. 0 (7l)
-··
(546.0, 548. 7) Highly fractured 0 With clay gouge.
557. ~: ' 'aS .. 7, 560.5 -562 .. 0 Highly fractured.
547.2
a l.Jo 1oo
547,.2 (l.OQ)
to
5.52 .. 0
R. 131-lOO
552 ... 0. (94}
to
. 557 .. 1
R l32 100
557 .. 1 (72)
to
·~~.·~c·----,~~---"~------------~.~~\ ------------~---------------l~s-:.2.:.-o----~ ,,
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ACRES AMERICAN INCORPORATED ~--_ ..... f*.....,·~:..,.SSfVfl'-. ------"'""""""--~
CONSULTING ENGINEERS ... aM ~~!~~!!~~
BUFFALO·~ NEW YORK ANC~ORAGE ¥ALASKA
CIAILLING REJ:iOI=IT
MU.ITNA ·HYI:1ACJ.U!CTAIC t=NcL.IP5CT
for ALASKA PCIWER· AUTHCJFIITY
HOlE NO._s_H--2-· .....__
~1.4eoET· NO .. 16. OF. :18 ,.,.,~£,. • . ._,
SITE DEVIL CANYON N. ABUTMEN'l' JOB NO. PSiQJ, e OS _ (ACRES) 052504 (RaM}
ROCK TYPE DESCRIPTiON a
L~-r..J.~
OF ',REC.
RUN· '(RQD)
~----+-------------~--------------------------------------------~--
562. O. -582. 9 Many reheai.ed fractures filled R 133 100
with calcite and quartz. Irregular orientations . 562 • 0 (98)
to
567.0
R 1341100
567 . 0 . (100) .
to J
572.1 ,'
R 135 100
572.~ {92)
to
S74.9
a 136 1oo
574.9 {94)
to
579.9
R 13.7 100
579~9 (93)
to
582 .. 9
582. 9 -627.8 Numerous thin bands of highly R 138 100 ·
fractured rock rehealed with quartz througb.ou.t. 582.9 (60)
Rehealed zones are le$s competent and badly to
br.oken by drilling. Hard to .soft and friable 584. 9
locally~
R 139
(584 .• 9 -589. 6) Core loss D. 2' . 584.9
to
589.6
(594.2 -594.6) Shear zone with clay gouge. R 140
589.6
to
594.6
96
(83)
• l.-QO
{78)
R 141 100
594.6 · .. (94)
to
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BUFFALO I NEW YORK ANCrfORAGE J ALASKA
QPIIL.I.ING AEPQRT
--.Uii:!"NA HVI:IRCJ.LIICTRIC Pt:tCI.JECT
for .AL.A8KA JICWBR AUTHCPIITV
HOI.E NO. BH-f..-· --
SHEETNO. 17 OF..l8
SITE DEVIL CANYON N .• ABUTMENT JOB NO. P570l.05 {ACRES) 052504 {R&M)
DEPTH
632.9
ROCK 1"YP!
CJua.:~:t:.z
G~allodiorite
Y.l
DESCRIPTION= LENCS~ eci£.
Of REC.
RUN (RQO)
(611.2. -611. 7) Shear zone.
(626. 8 -627 ~8)
0. 2' •
Shear zone, friable, core loss
R 142
599.6
.:.:>
601.8
R 143
601.8
to
604.0
R 144
604.0
to
609 .. 2
R 1.45
609 ... 2
to
6141>2
R ~46
61.4 ... 2
to
619 ... 5
R 147
6l.9.5
to
624.8
:a.. ~48
624 .. 8
to
630" .. 8
tigllt gra.yish brown, fine to med. grained, com-R ~4!-\
posed primarily of feldspars and quar~z witlt 2 to S30.S
5% mafics.. Massive, very h"'rd. Joint spacing . to
wide. Fairly sharp contact with . oveJ;lying 63o .. O
argillite. 1" Wide CO'Jltact zone With no apparent
contact metamorphism in argilli tte. • R 150
636.0
to
641.~
100
(91)
100
(91)
100
(81)
100
{80)
100
(93)
100
(93)
as
{70)
lOO
(100)
100
(100).
,. ·r
,__ ____ ......, ... ____ __, ________________ _, I<
I
: ACRES AMERICAft~ INCORPORATED 1--_, ___ ~_.-.. _ ....... :-~-. -~-........ -.....--------i•
COMSU• ..,._ t~·G·· ~NG-.. _ I.N.EER .. S "''-'"" ccr-.....T.&N,._9 -~
'-' I~ t;;. • _ ~ ~·• ~--.... aYflfMI
BUFFAl.O , \'fEW VOUK ANCHORAGE: , ALASKA
CPIILI.ING REPQ~T
fiUIIITNA HVI:IR\QEI.a.CTI=IIC PACI.JIICT
f~r ALASKA PCI~I!R AUTHCIPIITV
HOLE NO. m-2
SHEETNO • ..,.~OF 18
S~TE DEVIL CANYON N. AStfl'MENT JOB NO. P570l.05 (ACRES) 052504 (R&M)
DEPTH ROCK TYPE
656.2
.· ...
l
645.3 -650. 0 Argillite, with blebs and bands of
quartz throughout. No bedding structure evident .•
Fresh, very hard, joint spacing close to wide.
•
Ec1 of Hole
-.
r
l
L --Off!. . ~~" c
OF REC~
RUN (RQD)
R 151 100
641.2 (98)
to
646.5
R ~52 100
646.5 (100)
to
651.5
R 153 100
651.5 (~00)
to
656.2
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ACRES AMERft~AN INCORPORATED 1 ---~..o.· -· __ r.0;:::;:;;."'-~-=Qii:.....~. ~:::::::::::::::::::::'"'""',_~~·
CONSULTING ENGINIEERS ~I!..~S~~~...!'.!!:..!~S:
BUFFALO , NEW YORK · ANCHORAGE , AL.ASKA
CR!LLING MEI=CRT
SUSITNA HVCRCELECTRIC PRC..JEC~
for ALASKA POWER AUTHCRITY:
HOLE NO. BH-4
SHEET NO. 1 OF.l3,
SiTE r:~vil canyon ~th Abutnu:nt. ,. JOB NO. P570l.05 (ACRES) 052504 (R 8t M)
•
CONTRACTOR _ _..Th,;;;;;;.;;..e....;O;.;r;;.;i;;;;;l;,;;;l.;;in;;,;g~C;;.;;;c,;;;m~pan;;;;;;;.;.,;yf----· STARTED----·M··--~AU~G~l~4 ___ l9 80
------_______ FINISHED M. AUG 19 l9 80
ORIUJNQ.
METHOD
t.OC.O:nON:
DEPTH
SOIL. Casinq Advancer
ROCK Diamond Core Drill
LATITUDE ! 624857. 593
. DEPARTURE 1491823. 795 _
BEARING _...,..1...:9'""'5°~----
INITlAL DIP _ _....;6 .... 0-.0 ___ _
OTHER DIPS-------
ROCK TYPE 'OESCRIPTtON:
CASING ClAM. __ ... NW.;.;.;...,_-~< -1-.;;.."...;;;;;I.;;.;.D;;...~)-...... '
CORE OIAM. NQ-3 (1. 7Su)
1
ELEVATIONS: DATUM . _
CRILL PLATFORM -----'----
GROUND SURFACE.---1-3-.53;;, ___ ~
ROCK SURFACE 13~6
BOTTOM OF HOLE -m--~~~1"'!1o2~. 1._ ___ _
WATER TABLE 1 322
'LENGTH o/,..
Or' CORE.
RUN n~~Cn}
~---·~--------------~------------------------·--------------------+---~~~~.
0.0 Overburden
7.0
12. f)
Bedrock
Interbedded
Graywacke &
Argillite
· 0. v -12. 0 No sarL~les taken.
Graywacke -medium to dark gray, clayey matrix
containing fine to medium sand grains and sub-
rounded clasts of quart~, argillite and other
· rock types. Interbedded with al7gillite -medium
to dark. gray, fine grained. Laminae orienterl at
approximately 20° to corr.! axis. Rock i.s well
indurated, moderatly hard to nard, and competent •
Fresh to slightly weathered with limonite stam-
ing on joint surfaces. Minor sulfide mineraliza-
tion. Joint spacing ve":Y close to moderately
clo~e. Occasional joints healed with quartz and
carbonate. ·
12.0 .. 15 .. 2 Core loss Oft8'.
20.0, 23.4, 29.8 Slickensides and iron staining.
Joints parallel texture at 20° to 30° to core
axis . Some clay filling.
Run l
1.2 .. 0
to
l.S .. 2
Run 2
,15.2
to •
18.8
Rml 3
18.8
to
20.4
Run 4
·20 .. 4
to
25.4
75
(17)
100
(67)
101
(38)
101
(70)
..::Ha=.;;r.s;.;;en=.--_;:,;:Raha=· ::::im--. ____ (R a M) APPROVED ________ _.,.{ R aM )
LOGGED
BY
S1Jmrnary by Ac::omb OATE
APPROVED ---------{AC-R-ES1-, .. summary·by HenscP.el
-----------(ACRES) OATE
-~------------------------------------~--------------~~-------------------------~ -
ACRES .~MERlCAN INCORPORATED 1-------r;(.,.,~J-=: .......... l--------------1
CONSULTING ENGINEERS !'aM S1.!!!;•--;!~~.!!1.!!~
BUFFALO , NEW YORK ANCHORAGE , ALASKA
Dt=IILLING REI=ICIRT~
SUBITNA HVD~CJELBCTI=IIC. s:lt:r~Dr..II!CT
for ALASKA J:ICWBJ!. AUTHCII=IITV
HOLE NO. _s_H_--4--
SHEET NO. 2 0 F: 13
SITE . Devil Canyon ,,aou;t:h AbU~nt-r-JOB NO. P5701. OS (ACRES) 052504 (R&M)
DEPTH ROCK-TYPE
30.7 Graywacke
..
OESCRtPTtON:
25~4 -30.5 Core loss 0.2•.
Medium _gray to dark gray, siliceous. Clayey
matrix c:ontaJ.ning fine to coarse sand grains .:':nd
elipsoid clasts approximately 2mm x lmm in size.
Well indurated moderately har.d to hard, compe-
tent. Fresh to slightly weathere!i with some iron
staitU.ng on joint surfaces. Minor sulfide
mineralizat"ion throughtout. Joint spacing very
close to madera tely closa. Numerous joints
healed with calcite, oriented at approAimately
15° to 30° to core axis.
30.7 -45.0 Minor interbedded argillite·
(30. 7, 30. 9, 38. 8, 39 .l) Slicl;tensides and iron
staining in joints .
45.0 -46.2 Numerous joints at 15° to 20° to core
axis. Open, highly weathered attd clay filled.
62.7 Friable zone.
•
~.--~· L~'" ~~!. OF. REC.
RUN tRQD)
R .s 96
25 .. 4 (78)
to
30.5
R 6 100
30.5 (37)
to
34.0
R 7 100.
34 .. 0 (98)
to
39.0
R 8 100
39.0 (90)
to
44.0
R. g· 100
44.0 (43)
to
48.0
· R 10 100.
48 .. 0 (96)
to
' 53.1
R ll 100
S3.l (92)
to
$8.1
R 12 125
58.1 (59)
to
61.0
R 13 100
61.0 (71)
to
65.2
..
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ACRES AtAERICAN INCORPORATED t-----......,><'~.: .. .-~-~: · --.... , ---------.. -----=! CONSl~t..'"'(ING ENGl N EERS llt&M _cc:;_:ccr~t~~_•t~!~ ...... IL!~..!!lJ~ At Ill BUi=rALO , NEW YORK ANCHORAGE , ALASKA
~~~~~~--~--~~~-----L~----------------------------~~ ORILL.ING I=IE~OAT
BU.ITNA HYC11=1CIELECTP11C I=I~CJ.JI!CT
for ALASKA PCIWBA AUTHCI-=-ITV
SITE Devil canyon South_ AI?utment JOB NO. P570l .. OS
PEPTH ROCk TYPE OESC~IPTtON I
65.2-70.2 CorelossO.l'.
80.2 -80.9 Co~e loss 0.1'.
HOLE-NO. BH-4
SHEETNO. 3 OF.l3
{ACRES) 052504 {RaM)
---
1.----... ·~C
OF REC.
RUN (RQDJ
R l4
65,2
to
70.2
R 15
70 .. 2
to
75.0
R ].6
75.0
to
80 .. 2
R 17
ao .. a
to
80._9
R_ 18
80,9
tl.
84~1
R 1'9
98
{84)
100
(98)
100
(87)
89
(57)
100
(84)
100
84.1 (100) -86.0 Quartz vein with sulfides 0.01' thick.
.,
102.0 .. 103.0
st_ringers.
Numero>'Us quartz veins and
to
89.4
R 20
89 .. 4
·to
93, .. 2
R 21
93.2
to
98.2
R 22
98.2
to
103.4
100
(100)
100
(68)
100
(83)
ACRES AMER~CAN INCORPORATED 1-----__.--,...;..,.
CONSULTlNG ENGINEERS •aM ~.~.!~..!~!!':
BUFFALO I NEW YORK ANCHORAGE , At.ASKA
C1AILLING. REI'CIAT
BUBITNA ·HVI:IPICJ.L8CTRIC PRQ.JECT HOLE NO. BH-4
for ALASKA I=ICIWBR. AUTHQAITY s·HEETNO. 4 OF.13
SITE _o_e_:v_i_l_C_an...,..y_on ....... s ... o_u .. th.._.Ab.;;;;;;o.;;u;;,;;;tme .. · -:1-t...._._ JOB NO. P5701.05 (ACRES) 052504 (Rf*M) ..... --.... -------· ... ,, __________________ ..._ _____ ...,.. __ .,...ft'll~
DEPTH
10S.4.
114.9
ROCK TYPE
Graywacke
wj Interbedded
ArgilliC~
Phyllite
.
1
1 DESCRIPTION:. L. ~F'
" ... i:JN
I
104.4 ..,. 104 .. 6 Joint with slickensides and clay 23
103.4 -F"ll" -l. J.ng.
Graywacke (as described above) with some inter-
bedded Argillite. Transitional to underlying
phyllite. Argillite is medi.um to darkgray, fine
grained. Laminae oriented approximately l0° to
core axis. Moderately hard to very hard., fresh,
g~nerally competent.. Numerous contorte.d quartz
stri,ngers . throughout. Joint spacing close to
moder·~te.ly close.
to
108.4
24
108.4
to
1~3.3
R 25
113.3
to
117.7
Dark gray to black, ve.ry fine to fine grained.
Eoliatiou approximately 5° to 10° to core axis, R. 26
with mi.crofolds crosscutting foliation at ll7.7
approximately 30° (microfolt.s 20° to 30° to core to
axis). Hard to very hat:d, fresh.. Minor sulfide 120 .. 0
minerali%a\tion throughout. Quartz and carbonate
veins coom1on. Joint spacing close to moderately 27
close~ Nwuerous healed joints throughout. 120 • 0
to
125.0
~00
(92)
100
(100)
100
{95)
1.00
(87)
100
(100)
28 100
125.0 {87)
to
130.2
130.2 • 135 .s Core los$ 0 ~.2' . 96
u
(96)
30 100
135.5 (90)
to .. .
140 ... 5
to
45 .. 6
100
{96)
1
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~--------~~--·-~~----------------------~ ACRES AMERICAN INCORPORATED ~
CONSU • ':Tl G ENG EERS liii&M ~TA,.JTII ~~ . ._ N . IN • -·••• .. " "1...-~ .. -.
BUFFALO , NEW YORK ANCHORAGE , AL.ASi<A
CIRILLING REPORT
BU.ITNA HVDI=IC1BLECTRIC. PAO.JECT HOLE NO. BR-4
SHEET NO. 5 -OF.l3 for ALASKA ~CJWI!PI AUTHORITY ·
SITE. Devil canyon South Abutment JOB NO. P570l.05 (ACRES~ 0525 G~ {RSM)
DEPTH ROCK TYPE OESCRIPnON: L.--~ ·~·, c . OF RSC ...
RUN (RQD)
R 32 .100
145.6 (92)
... to
~50.8
,_,51.5 Meta-Argillite Dark gray to black, very fine grained, non-iR 33 100
~oliated to indistinct foliation. Hard to ve>;y 1150.,8 (100)
hard, well indurated, fresh and competent. Very to
gradational contact with ov~rlying phyllite. 156.0
Joint spacing close to moder:ate~y close,
1-
166.0-171.0 ·Core loss 0.1' ..
169.5 -170.4 Qua:ctz veins.
171.3 -172.3 Quartz veins
sulfide mineralization -core
ground by drilling; weak zone.
and
badly
1R 34 1oo
IJ.56.0 (96)
to
16~.0
R 35 100
161 .. 0 (lOQ.)
to
~66 .. 0
fR 36 98
tJ-66.0 (84)
to
1171 ... 0
• 1R 37
strl.D.gers, 11 71. ... '0
broken and to
fl.76.1 0
100
(84)
178 1 181 6 C b dl d d "\,;; R. 38 100
• -• ore · a y br.oken an sr.:ouu . uy 176 .. 1 (67)
drilling. Pieces 0 . OS ' to 0 . 1 ' inches diame.ter. to
.Joints have chlorite. ar. talc coating. ~7 9 •6
(179.6 -184.0) Core loss 0.1'. R 39 98
·179 .• 6 (45)
to
~84 •. 0
~ 4\0
~84 .. 0
to
~89 .. 1
100
:98)
ACRES AMERICAN INCORPORATED t------·-~,__ _ _, ______ --t
Co.NS. U' ·:riNG E:NGi.NEE 0. S .. aM CCFNM...ae..TAN'nl, 1NC. .. -n. V'l • • ~ ........... ..-.-. ~i.l':l111KJ
BUFFALO , NEW YORK ANCHO~AGE , ALASKA
CJI=IILLING I=IEJ:ICA'T
SU.rTNA HVCII:fCELECTI=IIC· ~RC.JECT
for ALA~KA I=OWER AUTHDAITV
HOLE NO. _BH_-_4 _ _._
SHEET NO. 6 0 F. 13
SITE Devil Can-yon South Abutment~ JOS NO, P57()1 .. 05 (ACRES) 052S04 {Re,~j
DEPTH
-··-· ~ L~cnc~
OF REC. OESCRIPTIOtJz
RUN. (RQDl
~----~--~----------~----------------------------------·-------=··,·--~----~--~
R 41 100
189 .. 1 . (79)
to
194.3
R 42 : J,OO
194.3 (100)
to
199 •. 6
••• •
I
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199.6 -201.6 Qu•~rtz vein 0. 02'
approximately 10° to 20~ to core axis.
mineralization.
thick at :R 43
Sulfide 199 • 6
to
100 I
(96) .
205.0 Phyllite Gray brown to. dark gray to black, very fine to .
fine grained, well developed foliation, with
characteristic sl.lv~ry luster (white•mica •
phyllite) on cJeara.ge surfaces. The rock
contains highly contorted quartz veins and·
~tringers throughout, which crosscut the
foliation.. ·orientation of foliation is highly
irregular in these zones. Rod;. is hard to very
hard, fresh and compet.ent. Joint spacing close
to moderately close. Nwnerous healed joints ..
222.3 -250. 0 Contorted quartz stringers and
veins form 201.~ to 40% of rock. Foliation highly .
irreglllar.
204 .. 6
R.44
204,.6
to
209 .. 6
R 45
209 .. 6
to
21.4 .. 9
R. 46
~14 .. 9
to
220 .. 0
R. 47
220 .. 0
to·
225.3
R48
225.3
to
230.1.
R 49
230.1
to
235 .. 5
100
(100}
100
(77)
100
(100)
100
(9~)
100
(67)
100
(91)
I "'---.a.. ...... _______ ....,.. •.. ),.... ..... .... _________ ......, __ .... _,._ _____ ~_ ...... ....__...,.
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.----ACRES A'MERICAN INCORPORATED r-----..... ~~-·-..·-....,·· _____ _, __ ~
CONSUL.TtNG_ ENGINEERS ~~taM CfS:'~~f'~\.!~
B~FFAa..O , NEW YORK ANCHORAGE • ALASKA
CIR!L~ING ~EJ:ICIAT
•uaiTNA HVDI=ICI.LIECTI=IIC FI"C.JECT
tor ALASKA PCIW8M AUTHCIIIIITY
HOl.E NO. BH-4
SHEETNO. 7 OF.l3
S!TE Devil canyon South Abutment JOB NO.. P570l. 05 (ACRES) 052504 . -(RaM)
ROCK TYPE
I
DESCRiPTIONt L~l~-~ ·or·" c ,. I!!IIUN REC ..
" tRQD)
R 50
235.5
to
240.3
R 51
240~3
to
245.6
100
{SS
J..ooj
(961
(246.3 -246.8)
with sulfides .
Quartz vein, highly mineralized R 52 100
252.0 -267.0 Zone. contains int-ermixed layers of
spotted. phyllite.
262..1 -262.5, 263 .. 9 -264.5, 271 .. 1 -271.8
Quartz veins, highly mineralized with sulfides .
24.5.6 (100)
to
247.8
R 53 . 100
241-..S {98)
to
250 .. 3
R 54 100
250 ... 3 (98)
-to
255~2
R. 55 100
255 .. 2 (82)
b
260 ... 3
_R:S6 100
260 ... 3 (69)
to
262 .. 6
R 57 100
262.6 (90)
to
~· 267.6
R 58 100
.267 .6 {84)
to
271 .. 9
·~----._----------------------------------------------------------·----.--~·~
; '
~·----...-----..____,............_. _ _____, __ _____, l
"
ACRES AMERICAN INCOR?ORATED ·t-----_.~.__-------·-----t
C llt&M CCF -...~TANT., INC. . ··•··· . . ONSULTlNG ENGINEERS I ·--•• ----··-
BUFFALO , NEW YORK ANCHORAGE , ALASKA
DRILLING REI=ICIRT
8U8n'NA HVI:JRCI.LECTRIC PRD..JECT
for -ALASKA I=ICIWEPI AUTHORITY
SITE Devil Canyon South Abutment JOB NO. P5701. OS
OEPTH ROCK TYPE DE!CRIPnONz
271.9-277.3 Core loss 0.3•.
282 .. 2 -287.5 Massive quartz vein ..
HOLE NO. _s_a_-_4 __
SHEET NO. a 0 F: 13 .
(ACRES) 052504 (R&M)
-· .,.
L.~ cOlE
Or REC.
RUN <RQD)
. -· 5.9 94
271.9 (91)
to
277.3
R 60 lOO
. 277 • .3 (92}
to
j289.0
IR 61
}281 .. ()
to
2916.0
R 62
286.0
to
291.0
1.00
(94)
100
(94)
292. 9 .. 295. 6 Shear zone. Rock is highly .
brecciated with clay gouge. Very friable. Rac!t
fragments range from 0. 01 t ·co 0. 1 • • Core loss
2. 0 t •
R 63
291 .. 0
to
293.5
so
(8)
307.0 -312.2 Core loss 0.1'.
308.1 -311.5, 318.3 -319~.2 High
with. chlorite and calcite coatings.
"
angle
.
joints
~ 64
293.5
to
297.9
a ss
297.9
to
301.9
R 66
30l.9
to
307 .o.
R 6.7
307.0
to
312.2
66
(55)
95
(90) .
100
(71)
98
(58)
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ACRES AMERICAN INCORPO.RATED t----_..~~-----.. ----------t
CO~SUL.TlNG ENGINEERS JUi;M ~~..!!~!'!::
B'JFFAl.O ~ NEW YORK ANCHORAGE , ALASKA
su•ITNA HVCIIAICIIUICTRIC PIICJ.JI!CT
for ALASKA J:ICIWEP"I AUTHCIIIITV
HOL.E NO. BH-4
SHEET NO. 9 0 F 13
StTE 0&9'il Canyon South Abutment JOB NC. P5701.05 (ACRES) 052504 (R&M)
DESCRIPTION;-
"
•
330 .. 4 ... 331.1 Open joints at 20~ ta core axis.
343 .. 9 '* 345.0 Qua~\~Z vein.
352.0 -376.3 Zone contains intermixed layers of
spotted phyllite.
~..---~ ·or•n c·
REC. RUN CRQQ)
1R Ga lOO
312.2 (8~)
to
317.0
I.R 69 100
317.0 (8,:~)
to
322,.0
R 10 100
322.0 (lOO)
to
327 .. 0
R 7l. 100
327 .. 2 (100}
to
332.2
R 72 100
3~-21 (94)
337.3
R 73 100
337.3 {94}
to
347.0
R 74 100
342.4 (89)
to
347:0
[a 75 100
347.0 (83)
to
3SO .. :O
R 76 ~00
3So .. o · <:Lo-,
to
.353.3 -
' lo
l~~
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ACRES AMERICAN· INCORPORATED ....,_ ___ _.~~---...----------~
CONSUl.ilNG ENGINEERS ~-~. c:!!.!!!N"~~!!::
BUFFALO , NEW YORK ANCHOR~G.S: , ALASKA
BU.ITNA ·HVI:Ir4a.L.ECTJ:II~ . I=IRCJ.IECT
for AL.ASKA J:ICIWEA AUTHCIAITV
HOLE NO. ~!:--4-· --
SHEET NO~ lO OF: l3
SITE Devil Canyon South Abutmeqt JOB NO. P570l, <a..{ACRES) OS25Q4 (RQM)
Ot:SC!~IPTION: --·-Y..t-l..~e.., c~
OF REC.
"UN (RQtU
(353.3-356.5) Core loss CL2'.
(362.5 -364.8) Massive quartz v.ein.
to
316 .. 3
37 6. 3 -387 . 0 Dark gray to black, well developed R S2
folia.tion at -10° to 20° to c~rl! axis. Contains 316 .. 3
no q•tartz stringers. . to
(376.3 -379~4) Core lo~$ 1.4'
379 .. 4
1R a3 3~9 .4 -386.0 Mislatch of core barrel, sec.tiQn 379.4
badly broken, core bad).y ground during drilling. to
386 .• 0
386.0 -39~.0 Core loss O .. Sl.
387.1 .. 399 .. 0 Spotted phyllite.
100
(N/A)
r-··
ACRES AMERICAN INCORPORATED ·~::::::_:_:.1i2~~~J;~~:.;.....~U""'' ---~...-_,-:::::::::::'_,......_~:,· :·-___ .,..-,_-___ -:!'""'f3
CONSUL.TlNG ENGlNEERS .-.aMcrae_atNu~•.~u:_L"';l~J'!l..!~ -~--
BUFFAl.O 1 NEW YORK ANCHORAGE , At.~SKA.
a.-IL.LING I=IEI='CJRT
.U.ITNA. HVJ:IRCI.LIICT-PIIC PJACI.JECT HOL..£ NO • ...,.:e....,a .... -4--..-
f.or ALASKA I=ICIW•R AUTHCIAITY SHEET NO. 11 OF13 ·
SITE Devil Canyon South .Abutment JOB NO. P570l.05 {ACRES) 052504 (R&M)
.
L£i«m.. . ~~ OF COR£.~
R. UN REC.
CRQD)
tR 96 lOO
396.0 {94)
to
401 .. 1
R 87 . 100
1401.1 {100)
tQ
406.1
406.5 ... (;.(1. 7 Zone contains occasional layers of IR sa 100
spotted p : .. ylli.te. !406.1 {86)
(425.0 • 430.3) Core loss 0,.1'.
to
1411 .. 1 J.
~ S9 100
f4U ... l (l,OO)
t.c
l4l'6 • .'2
!a 90 10.0
!416 .. 2 . {100}
. to
!420 .• 0
a 9.1 1oo
~20 .. 0 (100)
to
~25.0
~ 92
~2s.o
to
430 .. 3
tR 93
'430.3.
to
435.6
'
a 94
~35.6
·to·
~40.6
98
(96}
100
(81}
1.00
.{92)
:' q . --~ .. ---.......~----~,_ .. ---,-~-....-,.._,.·~-~-:" ~ ............. · ~--------........................ _....._, I',
~ ·{ :,
ACRES AME~ICANU.&CORPORATEO .__-----' .r!:2"""'..........._Jo.:~-S':.;;..~•___ . . . . •
CONSUt.TlNG ENGINEERS •aM ocr-..~TANT!,JNC: ' ·1· . --••~•'• ,... .. ..._ a¥.-• . :o., BUFFALO 1 NEW YORK ANCHORAG£··fA~M-,"-..,.=~-:--=.= .. ~--=~·-·---~--, -
. CI!UL.LINGI l::ali!PCII=IT I
•u··ITNA: MVI:JRCI.L.IICTAIC PACI.JECT ·HOLE NO. _aa_--4 --:. t
for ALA.KA ~~·R AUTHQRITV SHEETNo.l 2 op:l3 _1. _· __
Dev.il canyon south ~-~ent 'D5701 os .·(AC-RES), 052504' (R. c:a.M·) . ~S:rr~E~=·==·==·=·=-·=====;·===·~-=·~:·=· ==--==~~J~O~B~. :NO~·~=-====·==~~~~====~~~~~~
DEPTH DESCRIP"nONa L..-·~ -_.:.t::ll-.,... t ·CI!'I,." ~ .
OF. ftEC. I
RUN ( RQDl . i• ,
R 95 100
440.6 (94)
r to
!445 .. 7
~ 96 lOO
445.7 (90)
to
450.7
R 97 lOO
450 .. 7 (83)
to
454~3
R. 98 lOO
454.3 (72)
to
456 .. 1
R 99 100
456.~ (100)
to
~56 .. 7
Jr._,~~ ~~~l
:to
.. 461 .. -o
~ J;Q~ 100
461.0 (76)
to
~6.0
!R.· J.02 100
!466 .. 0 (100)
to
-~71.0
iR 103 100
~71.0 {98)'
to
1476.0
~-,<
-}
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ACRES AMERICAN INCORPORATED t-------~
CON. s· U' ""'I NG ENGI .. 00 EERS In AM ce~t•-.I!!.TANT•. •NC. .... '' ·-······ ......... _ ............. ...., BUFFALO , NEW YORk ANCHORAGE , ALASkA
. .... _Dt:IILL.ING AEPICAT
eU.ITNA HYQPICiiLaCTW::.IC pwqCI.JECT
for ALASKA ~WI!R AUTHCII=IITV
HOLE NO .... BH.,..-.... 4....__,_
SHEET NO. 13 OF. 13
SITE Devil Canyon South Abutment JOB NO. !?5701. 05 (ACRES)..Q.Sl-$04. (R&M)
-
DEPT'H 1..~ Off£ c . 0~ R!C.
ROCK TYPE OESCRIPTION:
· RU'ff (RQD) ~··----~------------~-------u--------------------------------+----+--~
R 104 100
476 .. 0' (98}
to
48~.0
~
R 1.05 100
48~.:0 (100)
.. to~
486.0
R 106 100
486-.. 0 (100)
to
49!.0
:R 1.07 100
491..,.0 (94}
to
49S."S
R~OS 100
49S~S (96)
to
SO!.,O
501.0 End of Hole
c.
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1-
APPENDIX B-2
WATER PRESSURE T.ESTS -R&M
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WATER PRESSURE TESTING DETAILS
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Water Pressure Testing Detai1s
This section expands on the mechanical details of Section 5.2a (ii) of the·
report oy describing the actual r·rocedures used ..
Calculations
T'l calculate the maximum water pressure to be applied in a given test section,
the following-steps were undertaken. The vertical depth to the static water
table in the hole and to the center of the test section was calculated. The
maximum tast pressure was equal to 1 psi per foot of vertical depth from the
ground sur, lace to the water· tab 1 e, plus 0. 5 psi per foot of verti ca 1 depth
from the water table down to the center of the test section-to a maximum
value of 200 psi.
In calculating the actual gauge pressure to be applied at the surface, the
hydrostatic pressure generated by the column of the water in the riser pipe
from. the water table to the top of the riser was subtracted from the calculated
t~st -pressure.
Accurate Measurements
In order to obtain accurate permeability values, it was necessary that the
app1 ied pressure. and flow rates be measured accurately. A pamal of four-
Fisher-Porter glass tube variable flow meters was set up as shown in Figure A.l.
These meters ht ·;e an ac.curacy of 1% over fu11 Si:ale and individual range.$ of
· ··o~tl2l-0 .. 267 gpm, 0.095-1.19 gpm, 0.34-4.25 gpm and 0.88-ll.O gpm. The panel
wa$ set .up to use any of the four meters or to bypass them altogether.
Water pressure was supplied by a Bean fixed-displacement, piston pump.. Te~t
pressure was monito·red using a liquid-filled Ashcroft model 1279 prt:!ssure
gauge with a 0 to 300 psi range and 2 psi divisions. The accuracy of thts
gauge is + 0.5% of full scale .• -
To eliminate pressure surging in the line, a surge tank was installed and
pressure snubbers w~ ... ~e used between the pressur-e gauge and the main line ...
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CALCULATIONS
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SUl\·1MARY OF WATER PRESSURE TEST RESULTS
Borehole Number
Location
___ __,B...,. • ....,H_,.,,_-_2..._ __
Watana
Ground Surface Elevation 1835
~tatic Water Level
Qip of Hoie
Stickup
Def,th Tested
From To
.{J.eet2 (feet2
23 .. 9 40
38.9 55
53.9 70
susi5/a1
Greater than 70'
None
Gauge Duration
Pressure of Test
~esi2 ~min)
20 20
26 10
30' ~n --
Flow
Rate
{gpm)
.32
.18
.42 to 2.5
Coeffic~ent of
Permeability
~em/sec)
2.26 X 10-s
9.80 X 10-6
1. 98 X 10-·S
to
1.17 X 10 -4
I
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I SUMMARY ·or: WATER PRESSURE TEST RESULTS
I Borehole Number B.H.-6
Location Watana
I Ground Surfar:;e Elevation 1605
Static Water Level 147 feet ~ Verticall
1\ Dip of Hole 60°
Stickup None
I
I Deeth Tested Gauge Duration
From To Pressure of rest
I (feet) ifeet) (psi) (min)
33~9 50 16 to. 18 10
I 48.9 65 22 to 24 10
I 63.9 80 28 ~0 30 10
I 78.9 95 35 to 36 10
93.9 110 41 to 44 10
I 108.9 125 ~to 50 10 . ~
123.9 140 54 to 58 10
I
I 138.9 155 61 tt.' 62 10
153.9 170 66 to 68 10
I 168.9 185 76 to 78 10
183.9 200 82 to 84 1-Q
I 198.9 215 92 to 98· 15
I
I. S' :;iS/d1
i
,-~-
Flow Rate
(gpm)
11
10.8
So4 to 8
2.4
2.2
'?,.9
4.4
"
3.7 to 3.8
4.3
4.0
1.3
1 .. 7
. t
Coefficient of
Permeability
(em/sec)
-4 1.93 X 10
-4 1.76 X 10
-5 s.n x 10 ·
To . -4 1e22 X 10
3.44 X 10-S
2.97 X lO-S
-5 3 .. 64 .X 10
-5 5.11 X 10
To.· _5 5 .. 29 X 10
4.28 X 10-5
4.65 X 10-S
4.02 X 10-S
-5 1 .. 25 X 10
1 .. 54 X 10-S
To .... 5 1.49 X 10
Borehole ~1-~ Watana -(Continued) I
I
Deeth Tested G~uge Duration Coefficient of I From To Pressure of Test Flow Rate Permeability i (feet) (feet) (psi; (min) (gpm) (em/sec) I -
213.9 230 98 to 104 10 1.4 1.22 X 10 .. 5
i . To
10-s
I
1.18 X I 10-s 228.9 245 108 . 15 1.75 1.44 X
243.9 260 114 25 1.t.' 7.96 X 10-6 I
' -6 ' 258.9 275 9.00 i 125 25 1.2 )(, 10
I 273.9 290 9.00 -6 125 45 .1.2 X 10
'
10-s
l 288.9 305 130 145 .54 3.94 X I 10-5 303.~9 320 140 25 4.9 3.40 X
318·.9 335 140 10 6.2 4.31 X 10""'5 I ---" ---·----a-33.9 . 350 200 10 10 to 30 S.36 X 10-s '
To
10-4 I 1 .. 61 X
I 348.9 365 200 50 .31 14.7 1.66 ... ·s ,I to X 10
To
10-5 7.89 X
363 .. 9 380 204 10 15 to 30 7.93 X 10-s I To
1.59 X 10-4
378.9 395 202 10 15 to 30 7.99 X 10 ... 5 I
Yo j
1.60 X 10-4
.I 393.9 410 204 10 6.6 3.49 X 10-5
' .J
408.9 425 202 10 3.75 2.00 X 10-s I 10-5 423 .. 9 440 202 10 5.7 3.03 X .~J
438.9 455 200 15 11 to 30 5.90 X to-5 I To -4 . ~~
1. 61 X 10
I 453.9 470 200 10 11 to 30 5.90 X 10-s
J To
4 10 ·4 1. 61 X I ;.
susi5/d2 -:....· '~·:.· .~ ·;-~"·:; ·. I
BOrehole BH-6 Watana -(Continued)
t C· ·. -... ~ Tested Gauge Duration Coefficient of --· "' Fron1 To Pressure of Test Flow Rate Permeability
~feet) ~feet2 ~esQ ~min) -Csem2 ~cm/sec2
I. 468.9 485 202 15 30
...s
11 to 5.86 X 10
To _4
I 1.-60 X 10
483.9 500 200 10 30 -5 11 to 5.90 X 10
To
I 1. 61 X 10 .. 4
-5 498.9 515 202 15 7.8 4.15 X 10
I 513.9 530 :204 15 7.5 3.96 X 10 ... 5
528.9 545 195 15 ·5
I 5.2 2.84 X 10
543.9 -560 205 15 -s 3 .. 8 2.00 X 10
-I 558.9 575 200 15 1.45 7.78 X 10 -o
573.9 590 195 10 5.2 2.84 X 10-5
I 588.9 605 200 15 8.5 4.56 X 10-S
I 603.9 620 205 10 2.95 1.55 X 10 .. 5
618.9 635 203 10 3.35 1.78 x 10-S
I 633.9 650 198 2.0 .55 2o97 x .10-G
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-=I t,.tSi5/d3
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SUMMARY OF WATER PRESSURE TEST RESULTS
Borehole Number
Location
a.H. -a
Watana
Ground Surface Elevation 1976
Static Water Level
Dip of Hole
Stickup
Deeth Tested
From To
(feet) (feet)
31.9 48
46 .. 9 63
61.9 78
76.9 93
91.9 108
106.9 123
121.9 138
136.9 153
151.9 168
166.9 183
181.9 198
196.9 213
226.9 243
241.9 258
25~ .. 9 273
271.9 288
286.9 303
301.9 318
316.9 333
.susi5/a2:
18 feet (Inclined)
60°
None
Gauge Duration
Pressure of Test
_lesi) (min)
20 13
25 20
31 5
38 10
45 15
51 20
57 10
64 5
70 9
n 10
84 10
90 10
104 8
110 6
116 5
so 6
so 7
50 6
·.142 5
Flow
.Rate
~gpm)
4.55
2 .. 1
.34
4.0
6.2
3 .. 2
.8
3.2
6.6
3.0
.38
1.2
3.7
10.3
7.5
7.0
3.85
2.95
7.8
Coefficient of
Permeability
(em/sec)
., 2.41 X 10 ·4
9.36 X 10 -s
1.21 x 10-s
1.26 X 10 .. 4
1.69 X 10-4
7.84 X 10 -5 -1.78 X 10-~
6.40 X 10 -s
1.22 X 10 --4
5.07 X 10 -s
5 .. 92 X 10 ... s
1.75 X 10 -s
,..
4.73 X 10 .. :l
1.25 X 10-4
8 ... 64 X 10 -5
' -4 1~74 X 10
9.60 X 10 -s
7 .. 35 x 10-s
7.42 x 10-s
. -~· :-;-~,-
1 Bo~eh.ole :sa::-a Watana -(Continued) I ., l I i
Depth Tested Gau~e Dur-ation Fi~w Coefficient of I
From To Pressure of Te:St Rate Permeability . .
I
(feet) .~feet) \esi) ~min.2 ~sem) ~cmLsec) :1
331.9 348 149 5 7.3
... 5 6.63 X 10
346 .. 9 363 155 6 2.45 2.14 X 10-s I -~ 361.9 378 162 5 2.75 2.31 X 10 ..
376.9 393 150 35 12.7 . 1.15 X 10.;.4
I 391.9 408 110 40 10 .. 9-1.32 X 10-4
10-s .
406.9 423 50 5 1. 7 4.24 X ;
421.9 438 188 6 .4 2.91 X 10-6 I 436.9 453 195 5 ~24 1.68 X 10-6
451.9 468 200 8 .36 •6 I 2.46 X 10
466.9 483 200 6 .54 -6 3.70 X 10
481.9 498 200 7 .54 --3.70 X 10-6
I 496.9 513 200 -.60 4.11 X 10-6
J
511.9 528 200 3.76 X 10""6 • 5 .55 I 526.9 543 200 5 .96 ·6 6.57 X 10
-6 541.9 558 200 6 .as 5.82 X 10 i
556.9 573 200 6 .76 5.20 X 10 .. 6 I ...
571.9 588 200 7 2.05 1.40 X 10-:)
586.9 603 aoo 6 .85 5.82 X 10 ... 6 I. 601.9 618 200 7 2.8 1.92 X
-s 10 .
616.9 633 200 6 .75 -s 5.13 X 10 I C31.9 548 200 6 .82 5~61 X 10-s
10-s I
646.9 663 225 8 1.60 9.77 X
661.9 678 200 6 .80 5.47 X 10-G I 10 .. 0 669 .. 9 671 200 7 1.1 7.53 X
691.9 708 200 6 1.08 7.39 X 10-s I 706.9 723 200 6 -s 1.2 8.21 X 10 I
721.9 738 200 12 , .. o 6.84 X 10-s I ..•
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DEVIL CANYON
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SUMMARY OF WATER PRESSURE TEST RESULTS
~orehole Number _s ..... a_-_1 _______ _
Lccation _____ D_,e .... v_il Canyon
Gr-o,.Jnd Surface Elevation 1415
Static Water Level
Dip of Hole
~-aeth Tested
From
(feet)
38 .. 9
53.9
68.9
83.9
98.9
113.9
128.9
143.9
158.9
173.9
To
(feet)
55
70
85
100
115
130
145·
_160
175
190
-susi5/f1
192 feet (Vel"'tical)
67°
Stickup
(feet)
8
3
8
3
8
3
8
3
8
3
Gauge
Pressure
{psi)
20
30
40
45
55
60
70
75
85
90
Duration
of Test
(min)
11
11
10
10
10
46
21
14
10
10
Flow Rate
(gpm)
.70
4.1
6.2
.i8
.50
.90 to 5.40
... so
.84 to 1.25
.02 to .15
Coefficient of
Permeability
(em/sec)
9.31 X 10-S -
5.07 X 10•5
6~94 X 10-S
-6 8.,53 X 10
-6 5 .. 00 X 10
8.82 X 10-S
To
5.29 X 10-S
-6 5 ... 88 X 10
To
8 .. 59 X 10-G
7 .. 10 X 10-S
6 .. 93 X 10-S
To . '· -s 1,03 X 10
1,62 X 10'"'7
. To _6 1 .22 X 10
Borehole BH-l
Depth Tested
From To
{feet) (feet)
l88.9
203.9
218.9
233.9
248.9
263.9
278 .. 9
293.9
30.8.9
323 .. 9
338.9
353.9
368.9
383.9
398.9
205
220
235
250
265
280
295
310
325
340
355
370
385
400
415
susi5/f2
Devil Canyon -(Continued)
Stickup
(feet)
a
3
8
8
3
8
3
8
3
8
3
8
3
8
Gauge
Pressure
(psi)
100
105
115
120
130
135
145
150
160
165
170
180
190
195
200
Duration
of Test
(min)
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Flow Rate-
(gpm2
1.65 to 2 .. 45
2.1
.6 to 1.2
2 .. 3 to 3.0
5.25
.1 to .4
2 to 5.8
1.1· to 2.8
.26 to 2 .. 2
.40
1.6
1 .5
2.2
.20 to .32
. 30 to .'70
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Coefficient ol·
Permeability 1·
1.2s x 10-s ,
To :
1.86 X 10-5 •
1.57 X 10•S
4.21 x 10-sJ
To · ·
··6 ~
8.43 x 10 '-
5
I
1.59 X 10 :
l To .1
0 -s. 2.08 X 1 :
3.43 ·x 10 -s
6.45 X 10·7 1
To
2.sa x 10 .. 6 ·
1.22 x 1o-5 J
i To .~. -5 3.55 X 10 I
-6 .. 6 .. 64 X 10 .
To _51 ..
1 •. 69 X 10 , .
1.49 X 10-S
To _5 ..•.•
1.26 X 10 · ·
f -s
2.27. X 10 I: ·.
-6 . 8.83 X 10 . ~
-6·· a_ 03 x 10 ,
-s 1.13 X 10
1.01 x 10"6 :I
To ·
1.62 X 10-S . ··· .· sl 1.48x10-.··J .
To 6 3.46 X 10-I
·, •···.· .. ,
••<'
,-;.
I Sorehole. BH-1 Devil Canyon '~"'·(Continued)
I
I Deeth T-ested Gauge Duration Coefficient of
From To .Stickup Pressure of Test Flow Rate Permeability ~feet2 ~feet). ~feet) ~esi) ~min2 ~eeml ~C"'..m/sec) -I 415.9 430 3 200 10 1.3 to 2.9 6.47 X 10-:S
To
10-s I 1.,44 X
428.9 445 8 -6 200 10 .30 1 .. 48 X 10
I 443.9 460 3 200 10 .62 to 1.65 3.{)8 X 10 .. 6
To
10<6 8 .. 21 X I 458.9 -6 ',~75 8 200 10 .55 2 .. 72 X 10 . . ~
473.9 490 200 . -6 I 3 10 .74 3.68 X 10
488.9 505 8 200 10 2.6 1.28 X 10-s
·~ 503.9 520 3 200 10 .50 to 2.0 2 .. 49 X 10-S
To -s 9 .. 95 X 10
I 518 .. 9 535 8 200 10 .2 to .. s 9 ... 88 X 10 -7
To
I 2.47 X 10 .. 6
533.9 550 3 200 10 2.4 to 5.0 1 .. 19 X 10""5
To
10-s I 2 .. 49 X
548.9 10-s 585 8 200 10 4.5 2~22 X
I 563.9 580 3
'
200 10 3.8 1.89 X 10-s
578.9 595 8 200 1 3.9 1 .. 93 X 10-s
I 593.9 610 3 200 10 9.7 4 .. ·83 X 10-s
I 608 .. 9 625 8 150 13 .2.55 1 .. 53 X 10-s
622.9 639 3 130 18 1.21 7 .. 98 X 10 ... 6
I 638.9 655 8 130 11 .55 3 .. 60 X 10-s
-5 653 .. 9 S70 3 200 10 7.4 3 .. 68 X 10 I 668 .. 9 . 685 8 130 1n 1.02 6 .. 67 X 10-s
•• ' '
I susi5/f3
Borehole mt-1 Devil Canyon ""' (Continued)
Oe~h. Tested Gauge Du~ation
From To Stickup Pressure of Test
(feet) (fee~l (feet) (psi) (min)
683.9 700 3 1SO 27
698 .. 9 715 8 150 19
713.9 730 3 150 13
728.9 745 8 150 14
susi5/f4
Flow Rate
(gpm)
.34 to .48
.4 to 1.12
.40
.80
I
I
Coefficient oJ
Permeability :
I
2.05 X 10-S
To :
2.90 X i0-61
-6 2.39 X 10 1.
To ' -6 . 6. 70 X 10 ..
'
2.41 X 10-S~
4. 79 X 1 0 •6 , :
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I . SUMMARY OF WAT£R PRESSURE TEST RESULTS .
I Borehole Number _.BIIAIH-.;.;-.-.2 ____ ........._ __ _
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Location Devii Canyon
Ground S·urface Elevation 1214
Static Water Level
Dip of Ho'e
Deeth Tested
From To
(feet) {_feet)
13.9 30
28.9 45
43.9 60
58.9 75
73.9 90
88.9 105
103.9 120
118.9 135
133.9 150
148.9-165
163.9 180
178.9 195
193.9 210
5 feet (l~cline.~),..._
60°
Gauge
Stickup Pressure
(feet) ( p15i)
""
7 12
2 18
7 22
2 25
7 35
2 42
7 50
2 55
7 65
2 70
7 82
2 85
7 100
Duration
of Test
(min)
10
10
10
10
10
12
10
10
10
10
10
10
10
Flow Rate
(gpm)
.60 to .82
1.1
4.0
1.15
1.45
.57
.30
.25
2.90
1.25
.34
.15
.. 48
Coefficient of
Permeability
(em/sec)
. -s 5.14 X 10
To _5 7.03 X 10
7.89 X 10-S
-4 2 .. 14 X 10
6 . ·o·s .. 15 X 1
5 .. 37 X 10-G
2 .. 25 X 10-S
-6 8.57 X 10
.. r
5 .. 40 X 10 ''
6 .. 01 X 10-S
-5 2 .. 44 X 10
5 .. 89 X 10-S
2 .. 58 X 10-S
. -6 -6.50 X 10
BOrehole BH-2 Devil Canyon ... (Continued) I,
I
Deeth Tested Gauge Dur-atiof\ Coefficient ofl From To Stickup Pressure of Test Flow Rate Permeability'·, (feet) (feet) (feet) (psi) (min) (gpm) t
208.9 225 2 105 -"~0 .45
223.9 240 7 110 10 .38 4.32 X 10-SI
238.9 255 2 115 .08 -6' ' 10 1. 08 X 10 -~
253.9 270 7 125 10 .zo 2.51 X 10-61
268.9 285 2 130 32 . 68 to 3.1 7.25 X 10-S ;_
To 5 1 3.31 X 10-. _
28.3.9 300 7 .98 -5 100 10 1.35 x :o _61 298.9 ' 315 2 145 10 . 21 1. 92 X· tO .
-6 .' 3J3.9 330 7 155 10 .25 2.39 X 10 I
328.9 345 2 160 -6 10 ~C! 3.31 X 10 . .,a
343.9 360 7 170 10 .28 2 .. 11 X 10-6 I
358.9 375 2 175 .68 -s 10 4.78 X 10 I 373.9 390 7 185 10 .58 4 .. 33 X 10-S . (
388.9 405 2 190 10 .3& 2.79 X 10-6 I 10-s 403.9 420 7 200 10 .56 3.87 X
l.f18.9 435 2 200 10 .36 2.51 X 10-s ,J
433 .. 9 450 7 200 10 .60 4.70 X 10""6
448.9 465 2 200 10 .60 4 .. 33 X 10-6 I
463.9 480 7 200 10 .38 2 .. 63 X 10-6
I 478.9 495 2 200 10 .56 4.05 X 10-S
493~9 510 7 200 10 ~30 ~.08 X 10-6 I
508.9 525 2 200 10 .58 3.91 X 10-S .
523.9 540 7 200 10 .30 2.08 X 10""6 I
538.9 555 2 200 10 .2~ 1.82 X 10-S I ' ~·~
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Borehole BH-2
•. Peeth Tested
From 1"o
~feet2 ~feet2
553.9 57,0
568.9 585
583.9 600
598.9 615
613.9 630
628.9 645
638.9 655
, Devil Canyon -(Continued)
Gauge Duration Coefficient of
Stickup Pres5ure of Test Flow Rate Permeabi Hty
_ifeetl_ ~esO ~min) ~sem2 _(cm/sec2 -
7 200 10 .36 2 .. 63 X 10 -6
z 200 10 .64 4.49 X 10-s
1 200 10 .56 4.15 X 10-s
2 200' 10 .40 2.79 X 10-s
7 200 10 .40 2.77 X 10'"'6
2 200 10 .46 3.21 X 10-s
11 200 10 .38 2.75 X 10 -6
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SUMMARY OF WATER PRESSU.RE TEST RESULTS
Borehole Number ..... s...,H;...-..;.4 _______ _
Location Devi.J Canyon
Ground Surface Elevation 1353
Static Water Level
Dip of Hole
...Q!~eth Tested
From To.
(feet) (feet)
13.9 30
28.9 45
43.9 60
58.9 75
73.9 90
88.9 110*
108.9 125
118.9 135
123.9 140
138.9 155*
148.9 185
153 .. 9 170
31 feet -(Vertical)
60°
Gauge
Stickup· Pressure
(feet) Cesn ·
1 10
6 15
1 20
6 24
1 34
6
14 50
1 55
1 56
6
6 70
1 50
Duration
of -Test
~min2
10
10
10
10
10
10
10
10
10
10
Flow
Rate
· <eem)
.045
.24
.25
.04
3.25
.26
3 .. 65
4.25
.050
1 .. 03
* Unable to test section -packer problems -high flow rate
£rom top of borehole.
susi5/e 1
Coefficient of
Permeability
~em/sec)
2.67 ·x 10-s
1.20 X 10-S
1.05 X 10·S
1 .. 43. "'(: 1 0 -6
9.52 X 10 -5
5.36 X 10 -6
7.31 X 10-S
8.61 . -s
X 10
8.26 X 10-7
2.35 X 10-S
-water flow
Borehole BH-4 Devil Canyo·n -(Continued) I
' .
J.
~
I
-,+:_.
Deeth Tested Gauge Duration Flow Coefficient of I From To Stickup Pressure. of Test Rate Perm*Obi I ity \ -~feet) (feetl (feetl (psi)_ (min) (gpm) (em/sec) I 163.9 180 80 10 .64 -6 1 9.84 X. 10 ..
178 .. 9 195 6 85 10 .04 -7 I 5.75 X 10
•7 193.9 210 1 95 10 .04 5 .. 22 X 10 '
208.9 225 6 100 10 .02 2.49 X 10 ... 7 I 240. 10-7 l 223.9 1 105 10 .03 3.58 X
I 238.9 255 6 115 10 .OS 5.51 X 10-7
l
253.9 270 1 125 10 .035 3.58 X 10-7 I 268 .. 9 285 s -7 130 10 .035 4.28 X 10
283.9 300 1 140 10 .025 2. 76 X 10 ·7 I
-7 I 298.9 315 6 145 10 .105 9. 69 :X 10 ,
I 313.9 330 1 ~&30 10 .035 ·7 3.02 :X 10 ·-· .
328.9 . 345 6 160 12 .45 3.62 X 10 .. 6
I 343.9 350 1 170 10 .20 1.54 X 10 .. 6
358.9 375 6 175 10 .11 8.53 X 10""7 I .. 6 373.9 390 1 185 10 .90 6.40 X 10
388.9 405 6 190 10 .OS 6.19 X 10 -7 I • 403.9 420 1 200 10 & 14 . -7 9.93 X 10 I 418.9 435 6 200 10 .12 -7 7.87 X 10 .
433.9 450 1 200 10 0 .12 7.94 X 10-7 I 10-7 448.9 465 s 200 10 . 10 6.56 X
458.9 475 1 200 10 .105 6. 95 X 1C-J I
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susi5/e2 I
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APPENDIX B-3
SUMMARY LOGS
--l
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~ •..
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••
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I ~-·.·---~ .. ;
i<f< '
\JATANA
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ACRES
LEGEND
~ ANOES!tt
~DIORITE
CORE REQ)VER'f a RQD(0/o).
o 20 «) eo ao 100
. ROO~ ~
R!' f!EOV£11tt,.
CORING IN ~"""'"_,
HOlE NO.
lOCATION
... u.. -
AMERICAN !NCCH~PORATED
B~OROCK l.OG..J
BH -2 ... -DATE JULY 1980
NORTH ABUTMENT -WA'T'AK~;..;.A ____ _
~UMSER OF
JOINTS PER
10FT.
5 10 15 20 RE&Wn<S
~,.;...-Pi--+-+--1--1---f-TOP OF ROCK-----,.......,_..,
GOUGE
CI.AY
HIGHI..Y Ff!AC'TURt:!'l
Al.TEREDa ......,
MINmAUZA"nON
SHEAR l'OfiliE
SUQ<$ {HOL.E C\VlNG)
SHEAR 2DN£
SHnR ZDNE -~~~~~_J
!R!!:CCJA
ANDESITE
DIORITE·
ACRES AMERICAN tNCORPORA_TEO
BEOROC.K LOGS
HOLE NO. BH-2 DATE JULY 198Q..
LOCATION _..N...,.O .... R.-T-..H.._....A_a,_u ..... T_M-=E=-N.-T_-....;W..;.;A.-.;T.;;.,;.'A.-,NA;..;._ ____ _ -g
~ ~ ~ PERMEASit.ll'Y COR£ RECOVERY NUMI!IER OF :
!i: > (X) CI'II/IIC. II a R.o.o. JOINT$ Pail 1¥ % 10FT. \II ...1
t·:l-5 10-! u-t Q 1¥ <!.0..0 ao .5 10 15 20 REMARI(S
I:! I'"' " ~ .
~ IC! ~~ ......
-QUART% VEIN ~ ~<
!SO ~ II'
:i , .. _
~-ALTERED
_400_ fl50§• I~
END OF HOl.E
.
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LEGEND
{f! I QUARTZ OIO~TE
.~ QUARTZ MONZONITE
CJ OtORtTE
.o 20 40 eo so 100
ACRES AMERICAN IN\,ORPORATED
. .
BEDROCK LOGS
fiOl.£ NO. BH-5 o~~TE . JULY 1980
LOCATION ~N~O:.:.R.:..;T..;..H~A=B.:::.UT..:..;M:.:.:.:::EN~T:..·--....;:W~'Ii.::.z.t.c.AU.iNA=-------
-t: -§
0
60
80
100
160
ISO
200
340
... u. -
Fo'ERMEABI\.ITY
tx) emluc.
REMARKS
HIGHLY FRAcTURED
JHtGHl.Y FRAC.TURED
HIGHLY FRACTURe
Al.TERED WEATHeRm.~
HIGHt:f FRACTURED a WEATHERF.D
FRACTUR!D
ANDA~
HIGHl-Y ,._ ____ _. AND !\\.~EO
..
QUARTZ
DIORITE
I
I.
ACRES Atv1ERlCAN INCORPORATED
BEDROCK LOGS
HOl.E NO. BH-6 DATE JULY 1980
l-OCATION NORTH ABUTMENT ... WATANA
360
520
540
680
CORE RECOVERY a R.a.o.
% eoao
HIGi'I..Y FRACTURED,
MINERA.!..IZ£0
SOFT1 MIERAIJZ!D
FRAC1'1JR¢D %0Nf!
!UCl<S
O.AY
o.AY
SUCKS
GOUGE
HEALED ..JOINTS,
AU"ER!O
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QUARTZ OIOR1
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ACRES AM'ERICAN INC-ORPORATED
BEDROCK I.OGS
HOLE NO. BH -s DATE JULY 1980
t.OCAT10N NORTH ABUTMENT -WATANlA
-....
~ ii PERMEABILITY COM RECOVERY NUMBER OF :
1-~ (X) cm/aec. II a Jta.o. JOINTS PER a. o/o 10FT. ~ ..1
1' )-!5 1o-! 10-l Q ~ 20406080 ' 10 IS ~o A£P,fA~ . :-~.~ _l_O__Q_ l+ I--~·~ I+ "' _$1JI S
7_20_ ~
li ~
.740 963.8 it-
END OF HOC.£ 740.4
t·-t:--
._
.A
t-FRACMED t.DC.W.Y
<::1
~ QUARTZ
l"!0RlTE
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ACRES AMERICAN INCORPORATED
U:GENO --
{;1~ ANDESITE
~ OJORITE
alAE RECOVEJW a RQ0(0/Cl)
0 20 ·40 10 80 100
BEDROCK l.OGS
HOLE NO. BH "'"8_. 'DATE JULY 1980
LOCATJON · ' SOlJJ:kL._ABUTME~fT' -WATANA
t -
Pt!AMe:A&lUTY
(X) cm/~~e.
to·S Hrl to"'
COR£ AECOVERY
a.~ta.o.
Ofo
NUM8£R OF
-~INTS ~
10FT.
5 10 15
SUCl<S
ry.....;.,o.-+-o+-o;-oL CLAY
FRACTtJ,R£D ZONI!
fflAcn.1RED 1.\)folg
HIGHlY
WEA"!'HERED
H!GH!.Y
FRACtURE!)
DlOFi!TE
I I.
··-,,
\.~-?)~\'~--" :,.,
,. ·:~: """"'-~-.......
ACRES AMERiCAN INCORPORATE-D
BEDROCK LOGS
HOLE NO. BH-8 DATE: JULY 1980
LOCATION __.SO_-,.:;.UTH....;.._AB.;..U.;..• T_M..-E.;..N_T_·-__...W-.A...,.:r,.~ ... N ..... A..__ _ _._ __ _
-J-0 .,_ -
360 ---....... --
SH!AR ZONE
1-oo+"'"""'lo......;.......;.-t~ JOCAUZED tUY
FIU.tNG
-· ·-,.
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ACRES AMERiCAN INCORPORATEO
BEDROCK l..OGS
HOLE NO. BH-8 OATE JULY 1980
LOCATION _$Ct.H"H ABUTMENT-WATANA
.!* !:• ~ PERM£A81UTY CORE ~ECOVER'f NUMe~~::;: ! :: .... > (X) c:m/stc • rs~ a R.o.o. . ~:: ... rs PER Q. I.IJ o/o 10FT • 11.1 ..I
1o·S 1o·3 1o·• Q w 40 GO. :SO ~ 10 15 20 RI!MARKS
I_O_O_ 1'
.~.
DIORITE
720 ,.. .. 1-
loc: • SOFT, FR1ASL!
_H_Q I'"
•132S
~I'· I SOFT, FRJASLE -EfQ OF HOLE
.. 760 f
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.
G~AYWACKE
CORE RECOVERY a R Q 0 (0/o)
~ -----~ --·--.
ACRES AMERICAN INCOR-PORATED
iJ,
SEOROCK LOGS
HOLE NOA ..... .-B...,H ..... -~1 --__,..--------·DATE AUG 1980
LOCATION DEVIL CANYON
E -
140
160
POtMEASILlTV
(X) cm/stc.
HIGHl:t FRACTUS£0.
GOUGE
ARG!U...lTE
META· ..
ARGIWTE
ARGILUTE
.,
..... \!
ACRES AMERlC.AN INCORPORATED
BEDROCK _LQGS
HOt.E NO ...... _...B-.H .... -......_1 __ ~----OATE_AUGUST,SO
L.OCATtON _..... ... D_EV_· .;.;;IL::..-...;C;;,;.AN.;;;..;;,;,~.;;;.O.;.;N--. ________ _
SH!AR ZONE
HIGHLY FRACTURED
""""--i'--+"-+--T--L HIGHLY FRACTURED
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ACRES -AMERICAN INCORPORATED
SEDROCK I...OGS
HOLE No.__at;~.-.-.:..1 --------OATE AUG 1980
LOCATION DEVIL CANYON
lloo --~ PER~~..SILIT'f CORE RECOVER't NUMBER OF : .. Gi (X) ~/uc. li a R.o.o. JOINTS P!R Cl. % 10FT. "" ~ _19·' 10-! k\ .. Q 1M <q06QJO 5 10 15 2:l R~ -·
720 ;
::-;-
r.-
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740
.
"'" HtGMLY FRA.o;ruRlW ~-....
1724-.4
S«) OS: HOI.£ 7!50.Z~ -~-
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§f GRAYWACKE
CORE REOJVERY a RQD (0/0 )
o ao ~ eo ao 100
ACRES AMERICAN INCORPORATED
9_EDROCK LOGS
H(.>t..E NO. __ B-..H._---~2--------DATE SEPT 1980
LOCATION , DEVIL CANYON.
CORE RECOVERY NUMBER OF a R.Q.O. JOlNTS -~ o/o -10FT.
s 10 15 20 R£MARKS
200
CLAY
,._ '' '' ><s<•;;,o.<<,,.......-~,...,v,V••r• """
ACRES AMERICAN INCORPORATED
BEDROCK LOGS
HOLE NO. -8~11~-_.2;;::..---------OAiE~~T 1980
· L.OCATlON _ DEVIL CANYON .
440
COR! REcOVERY a R.o.o.
%
40
GOUG£
CLAY
CU'f
QUARTZ VEIN a
AI.T£Rm ZONE
HIGHCf FRAC'TURED NJTH CUY
'GOUGE
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rf7r1 ({h PHYU..ITE
·~ ARGlLUtt'
CORE RECOVERY a ROO {0h)
.o .2d. 40. eo ao too
---~ .•. '-~--, .-··----=--
ACRES AMERICAN INCORF10RATED
BEDROCK LOGS
HOt.E No._B..;..,H..;... ~_4..;....... __________ DATE JULY 1980
LO~ATlON _..,;:;D;.;:EVI;..;.. :.;:L:-....;;.;CA~N..:..Y;..;;;O;.;..N--._.. _______ _
NUMBER OF
JOINTS PER
10FT.
5 10 IS .REMARKS
SUCKS
SUCKS
SLICKS
H IGHt.'f FRACTUit!D AND WEATHERED
.>u<mi..Y
-fo--;o.-+--+--1-' ~
~V!'lHS'
HIGtN.:I'
MINERAUUD
«WttZVEfN
HlGMf..Y
t.UUPJW..iZ!D
'QUARTZ VEIN
SHEIUl ZON£
l
PHYUJTE
l
META·
ARGil.UTE
?HYl..LlTE
' :;:::::::-
ACRES . AMERICAN-lNCOf~PORATED
BEDROCK I.OQS
HOLE NO. BH-4 OATEiYLY 1980_
LOCATION DEVIL . CANYON -~
\(, -
440
460
480
NUMBER OF
JOINTS PER
lOFT.
•o 15 20 REMAift<S
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APPENDIX C
BORROW.AREA INVESTIGATIONS
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APPENDIX Cu.l
AUGER DRILLING REPORTS -R&M
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OWN.
C.KC.
Sp_
Sl
Sl
S1
Sl
Sl
.S1
KW
MR.
OATE.Auq •.
ORGANIC MA«rERIAL
W/TRACE SILT
3:]. • V~sible Ice, 0-4.5', hr
Refusal
Boulders. 3.5'-6'
' ~;:llh ..... -------4 .. 5' No Visible Ice, 4.5'-6' 11 • 211; • SM . F 4
'rRACE OltGANJ:C 1-u\~-RIAL., 4 .. 5 I -6'
RP."F.usal, 11.1\, SM, F4 Sl
Refusal, 6 .. 7%, SM, F2
Little Visible !ce, .·6'-20
Refusal, 6.6.%, SM,F4
SILTY SAND W/TRACE TO
SO~lE GRAVEL .
Gray-Brown, Subanqular to
Subrounded
Refusal
Boulder at 20'; Refusal
~------------~-----------20'~.0.
~VATER TABLE NOT ENCOUNTE~O
8"0
Sl
Refusal
SILTY SAND W/TRACE, TO
SOME GRAVEL
Gray
11 .. 3%, SM, F4
@12, 9.4%, SM, F4
Possibly Frozen Be1.ow 21.'
Boulder at 2 9 • , RefusaJ.
SUSl:TNA RIVER
HYDROELECTP-IC PROJEC-r
GEOT.ECEn~ICAL INVES~IGATIONS
SCALE. 1'=*4'
. PftOJ.N0.052504
OWCUfCl
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r,
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~~~------------~-------0' ~: ~=--~ew~
,,
SANDY SILTY GRAVEL . '
Brown
Scattered Cobbles, 11.5'-30.5'
Boulder at 10 •. 5'
Visible Ice as layers
and Coatings, 2'-20, Vc+Vs
No Visible I~e, 20'-23', N
Visible Ice Lenses,
23 '-27', Vs
'No Visible lee,
27' -30. 5', N
Refusal ~~~--~-~------------a-30~5'T.D.
1 O"R~~~~'--O .. S'
2 Refusal , DIORITE BOULDER
/"::\"'----------1.5'
\J.} 10
SANDY SILTY GRAVEL .
Gray
Scattered Cobbles, 8'-15'
Boulder at 15"', Refusal
at::.i&A.------------lS' T.D ..
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"---~ SCAt.£. l~=4'
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SCALE. l'-::.4'
~\efu~al
Sould~~, 7 .s• -lO' · i= GRAVEL W/SOME SILT
~c~ttered CObbles, 4'-25'
100+
28
Refusal
Refusal
..
Boul~e.r, 20.5' -·~·
Refusal
25 1 T.D •
I=1S.M. CONSIJLTAN'TS! 1NC. ......... Ill. lltllll ..,.,.. ...__,...... ..~ ..... '
AH-E2
7-18-80 0'
Sp
Sl
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iORGANIC MATERIAL
~~LTY SAND GRADING TO
TO SAND W/SOME SILT
I?'\ .Brown ~ 15
1.5'
-------.. ......... ~ ....... -4.5'
46
Refusal
SANDY GRAVEL W/TRACE SILT
t-tumerous Co.bbles
Refusal
Boulder at 10', Refusa±O'T,..D.
SUSI'rNA RIVER
HYDROELECTRIC PROJECT
GEOTECHNICAL !NVE$TIGATIO~S
F.8.
l"lltO.&.HO.OS2504
OWG.MO.
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'CXQ. MH
QA7£.AUq .. 80
~CAL£. 1'•4'
60, 4.4\, SP/SM, F20
100+, 0.7\, GW; NFS
Scattered Cobbles,
1.5' -20'
Refusal
SANOY GRAVEL ii/TRACE TO
SOME SIL'l'
'Srown , Subangular to
Subrotinded
100+
94
Aii-E4
7-17-80 0'
ORGAN!C MA"'l'ERIAL ~---------· .;.5' ·SILT vl/SOME SAL'm
B~'!E._ _____ -1.5'
§_tm ·w/SOME SILT
t~· Orange.,..ar.own
_w,__ _ _...--~ ~.-,__._,:_.__ 4 f
~IGi~S~ 22 SANOY SILT
~rown 4 s·' ~-~{)7··---~---~-~· •
· scat~~i-~' cg~bl~i, 4. s' -20'
Refusal
Sl Re!usal
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HYDR.OELE~C PROJECl'
.GEa.t'ECHNl:CAL:"iiNVESTIGATIONS
""'-F.~:_,o._. ___ ........ .,. 1. ::':
P~J.N0.0S2 504
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S:l 4 O.RGANlC MATERIAL sl :::::::-a3-8 i~RSs~~~
Sl Red-Tan
Sl 4 ~~----2' :J;US.a ...
s~ lOO+
100+
Sl, GRAWL W/TRACE TO SOME
Sl.
A
Sl.
A
Sl
KW
SJ:L'r~ SOME SAND
Brown, Subrounde2 to
le~iJ:lar
Refusal
Scattered Cobbles and
Boulders, 2 9 -lO'
Refusal
--~----------------------tO'T.O.
WATER TABLE NO'l' ENCOUNTEmm
Sp
Sp
Sl
Sl
Sl
Sl
Sl
Sl
Sl
Sl
AH-E6
~~~----------------~a· ORGANIC MATERIAL .
~--......~---..;... ...... ~---~5'
~~D W/TRACE SILT
..-....-.---~ ~------245
Refusal
SANDY GRAVEL W/TRACE SILT Brown -
Scattered Cobbles, 2.5-6r
Refusal
32
INTERLAYERED SANDY SILT
~wRILTY-SAND
25 .... .,. ..... __ ~ __ ......,._._..._~--g•
Refusal
SANDY GRAVEL
ti/SOME SILT
Brown, Subangular to Sobrounded
Scattered Cobbles, 9'-26.5'
Refusal
81
80
SUSI!rNA Rl-"VE:R: ta. .
Ct<O. Mil l
O•TE.Autr .. 80
SCAL£. .l t24t
c;rt•n.
;~-l.NQ.052$04
DWG.NO. -t"
R&M CONSULTANTS, JNC. HYD'ROELECTRIC PROJECT
. aNGtlll••,.• ~~~...,. ~-.... '"' • .,Cilia l ~OTECliNICAL IN'Y'SSTlGA'I'IONS
' . __ . . .
Sl
Sl
Scattered to ~umerous
Cobbles, 0-5.5'
RQfusal
2. 3\., ~..t. NFS
SANOx GRa.V'SL
W/TRACE SILT
Yellow-Brown
Refusal
Boulder at 5. 5' , Refusal
Sp
Sp
Sl
S.l
Sl Refusal Sl
~iiii1ooii------------.. 5.5 'T .0.
WA'l'ER TABLE NOT ENCOUNTEF.ED . -
AH-ES
7-?.l-ao.
100+
SANDY GRAVEL
W/TRACE SILT
Yellow-Brown
Refusal
S.cattered CC'bbles, 3"-6'
Boulder at 6' J ·Refusal • T .D.
WATER TABLE NOT ENCOUNTERED
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SUS;t'!'NA RIVER
HYDROE:t;Ecttf-~IC · PROJ1:;C1'
GEOTECin!ICAL IlNES.TIGA'riONS
"" ........... F. B.
CfttD.
PRO~NO. PS2504
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seAt. E. l'.&2'
Sp
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SAND W/S0~1E s:.ILT
AND TRACE ORGANIC
MATERIAL
Ye~low-Brown
21, 15.7%, SM, P2
56
SANOY GRAVEL W/SOME
SILT
No Recovery
Sl 100
Scatte.t::~d Cobbles,
2.5'-S'
A 4 .. 4'-r G.'1, Fl
Boulder at 8 • , Refusal
WATEit TABLE NOT ENCOUNTERED
0 ~. s. ULTA~.TS. 11\lC. o~ll'nO-· ~· •uav..nMY~ .
==·~·====·==========~==~
r-;USI'mA RIVER. I HYD~~CTR!C PROJECT l GEOTECHNICAL INVEBSTIGATIONS
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DEVIL CANYON
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OR-:r~-"'-~,TERIAL
~--·/;;:,o:O.,.;.......at ......... ___ .._._ .5·.1
~AND W/SOME SI~T
Brown-Gray
15
S&'lOY GRAVEL W/TRACE SILT
A
Scatte.redCobbles, llr-23'
!tefusal
SOulder at 23 ~., Refusal-
~~-----------23 'T ~.D.
~lATER TABLE NOT EtlCO'ONTE~O
!
-__________ ....._.,_.. ____ -::::::::::~· "'"'".._,.._ _ __, ~--------------------~~· ~----~~--------~ :
OVOt KW
CKQ. MH
OATE. A~g~• 80 'j
SCA\.E. ·1 ' ;a4 ' ·-.
. 2.~-~...':.~~:~~~
~,-. +
SUSITNA RIVER
SYDROELECTltiC Pm12CT
GEOTECHNICAL n~STIGAT!ONS
-· F. I.
GRIL\
PRO.J.MQ 052504
OWG.HQ.
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Sp
SP
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Sl
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ORGANJ:C MATERIAL
Seasonal Frost .5-1.5'
53
SILTY SAND AND
SAND t'l/TRACE SILT
Gray-Tan
~--;; .. ~---------......__3.
54
89
SANDY GRAVEL W/TRACE
SIL'l'
Brown to Gray, Subangular to
SubroWlde
Refusal
Scattered Cobbles, 6 1 -ll'
Refusal
Refusal
Boulder at 11 1 , Refusal
~~----------------------ll'T.D.
WA'.rER TABLE NOT ENCOUNTEJ:'mD
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SUSITNA RIVER
-HYDROELECTRIC PROJECT
GEOTECHNICAL ~.,~S'.Cl:GATIONS
1/;,.
PROJ.80oS2504
O~C!NO.
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APPENDIX C-2
LABORATORY TEST DATA -R&M
SUMMARY OF LABORATORY TEST DATA
I I R ' M c ¢N4U co.T ANTS. 'Nl:. Q.Al'E -·-l.Oao-;;;l?.,.-ec...-. ______ _
SUMMARY OF L.A80RATORY . TUT DATAj ,_.. ... ; . ;"""" .. n .._ <;=9&
.. i• \ ~a• ua zi .
IICL I ottr-r.s 4• l• l• l't· 1• l/4" :t.n• l/811 H tlO 140 1200 ~02 005 CY.J2 m.uc. '.r.t. n Cl ....
I. .... H -.... laG ~§ ee 1M 81 '78 71 ~ 53 31.2 24.3 U!i ia.5 .10,9 21.1 ~.2 ~·!It!_ •l
(c:nb .-l•t --ll -... -100 §'7 g2 ... 114 !1!11 7~ §A y l&.o t!l .. 6 a~ .!1.2 1::1 .. 3 1.1. .l _'l .. S. . t:JIIioicill
I (Gtab .... v-ao-za 100 H.S 81.3 &9~ 50.81 42.1 55.9 13.2 ~~_..,:
(G:alt --lel -ow·-. ....... lOG 100 95 91 19 n H 8o 16 !I ll.9 9.2 l.O 1.3 '·' --liP eo SlC
•• ftlllli (Gnb :M~~Pl•»
~-w-80-302 " 100 92 go 82 69 58 45 lB ~' 23 14 l.~ a.
!~ .... leA ..
I -D .w-o1 ts 00 99 95 94 91) 84 59 <42.3 lt.o )§.1 2.6 ll.l IN !ZP SM
(G.O-7.S'l
D AD-01 " lOD 1'7 11'7 tU ao '7! G~ S4 3.3 14.4 6.] l.l 6.7 J SM•
(8 .. 0 -8.!1 1 f
I D All-ol t1 00 91 91 ll7 11 62 lS.7 11.2 11.2 4.9 ~-6 a•
(10.0 .. .tO..l'l
D ~tl. 1ao 80 80 8Q 'M' 13 •. 72 61. u 47 3a5 u • .a ~~-2 2.9 u.·, -• SM
I (1.3 • 1. o•' .,..... D Ali-02 N 100 94 ~2 9D • .. , sa 3!1~0 21.: 4.1 2 •• U.4 il.9 . • 5H
it3.0-4.5").
~· t .
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I
0 :~ l'!"ll/4. ' BH£1:-' WUt Ji . . l. 1ft• lJ2• .02 .005 J102 tto!ac. :u. 'ft -·QE"M .c• 2• 3/8 14 110 MO t2CO
-
Irs ~~·~ 100 ga ~ 92 87 80 59 30. ' lJ.a lSo 1.6 11.2 !IV' -a .
<.c •. s -s.o 1 l
D All-02 ta lOQ 99 !)7 93 81 10 44.0 22.5 as 4.0 ll.J l5.s, ' :2.4 Sli
f1~il -HL~J
1) u-oz 19 lGO M .94 ~·~
93 91 85 1S 51 Jl.i ll.l 10.'3 4.2 .9.4 1'7.s >l.l :511
(2o.o-n .. s• .
! ...... -.. 1: A&eU 13 100-99 41.0 19.6 5I@
ltt.~n-t.!•'t
• All-&1 .... 100 91 59.5 l7.l ML•
l2..A • .'L!'' ..... • All-a •• 100 .. H 83 ao 71 72 62 52 21 6•2 4.4 D/Sil
:t4.-.S -s.o•1
I· • M-G IT 100 90 71 6Z 57 40 ll 11 1.7 4.7 Gil :-• ••
(6.5 .. a.o•!
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. 1(5.0 .. 6.51 1 : ..
I • .AII-C1 f3 100 85 13 sa .. , 39 31 .1: 2.1 2,l Gil
lt2 0 •l.O.'' .
I; u.n t2 (1-e! ... l o•1 100 99 28.6 15.7 SM
z ...... 15(1.5 ... a 0') ~ 95 U'f '79 5'7 ~ 33 17.0 ~-· G.."t ··-·.
~::" -...... · ' ------
'1
; HOTC! SIC'IC 4NA«.,YS1B • PEKI.HT :PAUINl
.... ~~~~··~· !"''Qi~!lll¢ilill'" ...... b;::;;;;;;·~M~Q·. ~Uo~·lllil1.....-;/ ____ .....
.l~VCD . . .
U. S. :ilai'Jirlrll Sieve Opll\la;a ia lacJI~a u.s. Slaaearll Siev11 Hum~11i Hwdfomeht
~ 2 ... ,~ I ~ ·~ 3/1 s 4 • • 10 14 16 20 30 .oiO 50 liQ 70 LOO 140 0) 2?0 .
100 ·~ ~ I I! I !I I I I I J t• I I I • I o·
" ~ 90 " ~ 10 .
80 "'" 20
I'"'
.
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SAMPLE NO. ~:~~':f DRY OEr..~tTV LL Pt CLASSifiCATION a Df:SCRIPTION
W-80-256 "
W-80-257
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BORROW AREA H DRAWN BY DL
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Groin Size in Millimeters ~No ; ' Medium 1 ftn SlLT or CLA'I
Pi CLASSIFICATION a DESCRIPTION
9 ... 2 GC-SC Poorly graded 'Tillt with 1o"'! P1asticit
· SlLTY GRAVEL AND SAND WITH TRACE CLAY
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;. SAMPLE NO. -~~~ DiiY LL Pi CLASSIFICAT~O.~ .. a OESCAlPTION Dt.~SITY .
W-80-257 12 .. 3 17 .. 1 2.5 GM..-SM Poorlv graded 'Till' with Non-Plastic Fines
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SAMPLE NO. i:ONT£NT oEt.stn LL Pt CLASSIFICATION 8: DESCRlPTlON
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. -
COffffHT .O£NSITV a O£SCRIPTtON ..... ·~·
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PI CLASS,FICAltON a or!£SCRIPTION
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E MtdiU!iAN~I I J fino SiLT cr CLAY
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ClASSif'ICAT&ON a OESCfttPTlON ,,
SM SILT AND SUD WITH 'J?RACE GRAVEL AND TRACE CLAY
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Groan-Si1!'l in Millimeters n-Mg!li!~~A= r ;Jn~ I SilT or CLAY
CLASSIFICATION a DESCRIPTION
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I §ftA~El I Coaru
SAND I SILT or ClA¥ I Co ant I Fint I Mediym I fino
--SAMPLE NO. ~~~~~ OE~TY LL PI CLASSlflCATION a O.ESCA~PTION
.J\H-02-3 25.7% NV NP SM SILTY GRAVELLY SAND W/TRACE CLAY .
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I Cogru iBi::l Ein~: I COOlS! I Mtdi~ND I i~~~ I SILT or CLAY
•
SAMPLE NO. MCISiUA£ c0i.t£tn DRY
Ot!ttSJTV LL PI CLASSlfiCATlON a. OESCRlPTION
AH~D2-4 11.4\ 13.9 NP SM SILTY .SAND WITH SOME GRAVEL, TRACE CLAY
(3.0-4.5'1 Non Plastic -
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Groin Size in Millimeters "' Eiaru iBA~~b '1-Coarse
SAHQ I SILT or CLAY J I fino I Medium I Fine
..
SAMPLE NO. MOI"S~-DRY LL PI CLASSIFCCATION 8 OESCRlPTlON . CONTENT OEhSITY .
AH-02-5 11 ''2fk NV NP SM SILTY SAND WITH. SOME GRAWL, TRACE CLAY
-'' .
(4. S-6. 0 1 ) Non Viscous, l..lon Plastic --. .
·-··
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.
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" ·-., DRAWN 6\" DL
R $
. APPROV£0 B'/
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BORROW AREA D
CONSULTANTS, lN C. ·DATE DEC .. 1980 -
~:
PROJECT NO. 052SOA.· .
' ·""""..! --... · --. ' .... , ~. -
--------------------~----------,--,-~ ~-~ ~------------·.-·•'·-
:
U. 5. st .. Jiar4 Sia'le O.•blat ia IHtsaa U.S. St_..ll Sievt Nued.liNt H;Q!IMellf
3 2 I Ill I 18 ,,~ 3/1 3 4 6 a 10 14 a6 20 30 40 ~6010 ~ ~140 200 210 . Q; 100 I ~ I I' ~~ l ~ J -r 1 ~ ! I I • I II
' " ~ t. (}
90 .............. lQ
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~ 60 .. 4Q1 :;>,.
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.... -~ •C-1·
ll 50 50~ ~ .s ,. 10
IL ·•o
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4. ' ,..
L--", QL
30 7QJ
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~ 20 "" ~ 6Q
'
~r-.. ~ 10 . 9.Q! ...... :----.......
OlOO 50 10 5 l O.!l. 0& 0.05 0.01
IOQI
0.005 0.001
Grain Size in Millimeters
I CO an: i8All~b I · ; ~ SAND ftnf L SILTot CLAY I I fino Coarse I M diym I
... ..
SAMPLE NO. c:.l-'£:1 DRY ll PI CLASSiflCATtON a DESCRIPTION GENSITY • !--•
l SM AH-D2-8 11.3% 15,5 2 2 SILTY S:ANn ru:.t.·n TRACE GRAVEL. TRACE CLAY
IC15.0-16.5'
~
'
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DRAWN BY DL
R $ <:;..
BORROW AREA D APPROVED B'i
M CONSULT'ANTS, INC. DATE DEC. 1980
-.. -.. ~--.-;:~ '~ 0 •• ~ .... --"~.-~, .. PROJECT NO. 0'52504 .,.
-·
.
0 -0
N -..
N
·---------------------·
-u.s., ... ., .. ,...,. Dp .... ia .. , .... -U.S. Staadw4 Sian Huml~ara tt~•?A\eler
100 s 2 lli2 ! ~ an • 3 4 6 8 ID ,. 16 2j 30 40 506010 100 140 200 210 ,........ t-.! :• I .I . I I I I II I I I I I I! m ... . ~
90 ............ ill I)
r..; -Ub
"" !'..... ..... r-.... 80 ......, an·
r-.....
70 "" 3,Q) -.c -t-. '"' .c
D I" \01 •• ~ 3:
~ 60. 4,Q): >..
.A' ' ,A
r-... ._
~· " .. ·• . 5 50 5J~J ...
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LL 8 -"to c -e 40 ~ c: u --> • "--~t-;..· 4l ... ... • ...
4. r-. ••
' 4.
30 ['. 'l()
l'o..
20 ~ SQ;. ... "-
10
....~ ..... --r........ · SJl
....... ....
O·,oo $0 10 s • 0.5
lOO
0.1 0.05 ClOI 0.005 0.001
Groin Size in MillimeterS'
I Cogru
'§Bl~~l
Fin! r : Coarst I ~~MD Mtd(= I . Fin~ I SILT or CLAY I
SAMPL£ NO.. I t'~i~~ Jl~_ LL PI CLASSifiCATION a DESCRIPTION UI:.N:JII T
lllli-D2-9 ~""·4 -i ~-~~.. _ .... ..... -~ ... ~criAYI ·= Ia ~ . .:SAND W.!.!.l'n Sl1Mtt; 'GRA\f£SL -Jiii;i • (20 .. Q .... 21. 5
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toRAwN·av· .DI •
. R $ A--. ..: av
M BORROYI AREA D .. ,, .. ..,.JfD
CON SO LTANTS,. lN c. IOATfDEC.; 1.980
l IPRo:iE:cfoo. bs25o4 ,·
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;-_,,'
-·--
I
I U. S. St••• aien Optrtlfigt ia. IR~•• · u.s. St0114Gtd Si•~• Nuadi•n H~ckomt~~tr
100
"3. 2 'l/2 I !14 t/2. 3/8 3 4 6 e 10 l4 l6 20 30 40 506070 lOO 140 200 270 •..
I r\. "\II l l I I I I I l ' I ' 0 -
!\ ['-.. t..... 1h.
90 i\ ' ' i' !". ~ ,.....
' ~\ '" " ' ~ 10 ,,
N \ " i\\' 80 .....
'~ ,~ .'\. 20·
1\ ' ~ t\ \ 1\" 70 --·~ .1'~ X\ ~Q .liZ:::
.c: r\. l:tJo,
D -·; \X ~ "' --~y !\ \ i\ ~
~ 60 \'~ i'. ' \ ' ~
. 4(} ~ 1; ~ .. 1"--[l, ..
..... ... \ ~ "' _, \ ~
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I 50 !\ .... ~ ·-· I' "' ' \ '1"--~ 5Q: -Ll. i\ . . ~-
.. -~~ ~" i i'\ ' -u 40 ~ \ 6Q, = '-~ • !-..
•;lU
4.
11:1...
' " t'-r---. "" \· .r
~0 ' I'\ ~ ~.l H -E fJ-~ 70;
" r.... ft-
~ ~ ~ i'
.20 "" ~ ~ IJ.J -'If' ~-~=
~I' !'-\' "I'.. to-EB-tl
QQ.
r-... Jll
f'... '"""' ~ "' tO ~ --...... ~ ~'-;
9Q
. I lu _'I: 1-:l ..
0 toO
tl F ~ 1 H~E ~-~
00 10 5 I 0.~ 0.1 l:~tif#. OQl ~-'lO~
tOO.
0.001
I GftJ~~b ,.Coarse
Groin Size in Mhlimators
i ~jio = ; I
...
I Cogrje I M~dl; I fin SILT or CLAY . fint <
MOI=!_l~ SAMPLE NO. Oft¥ LL PI CLASSIFICAT&ON a DESCRIPTION CONTENT OEt.ISITY
hR-F.l-3
AH-El-4
-c;:··.
AH-E3-6
-Ali-E3-·7
AH-E4-6
Ali~E7-3 ..
AH ... E9-2
AH-E9.;.;6 DRAWN BY DL
R$M BORROW AREA E· APPROVEO 8't I
C Ofil SU LTANTS, lNC. SUMMARY OF GRAIN SIZE. DIS!CRl:BUTIONS OATE. DEC. 1980 ' .
PROJECT NO. 052504
"
Q a
N ,.,.
N ..
U.s. ttoRAarlt lltvt Oftnllltt tA .._Gfltt
100 ~ 2 11/l I 14 112. 3/8 3 •• I I I II I
90
eo
70 -~
0 ·a
3t 60
~ ....
~. 50 ii:'
E • 40 u .... ..
Q.
30 '·
20
J. ).
.I
10 . I
0 aoo fO 10
=r. GBA~~l ' Cogru I fine -
SAMPlE .NO. ~:~~~ DRY Ll DENS IT\'
AH-El-3 19 .. 6\
fl. o-1. s•)
1--.,
(
R $ M CON$ULTANTS,
.
-
u.s. st.,..,4 Slc~s ~•~»••• ttwdro"'''" • • I ) 14 ,, 0 lO ~0 506070 100 140 200 270 .
I I I I ~, f I 1 I
\
·~ \..
.
'l \ ~
' ~
\
\
\ -
' :J
1\
[«:
-
& I 0.5 0.1 0.0~ 0.01 0.00~
Groin Size in Millimeters
I Co grit
SAND I SILT ot CLAY I Medium I fine -
PI CLASSifiCATION: a DESCRIPTION
SM SILTY SAND
BORROW AREA E
I til C.
.. -....... -. ... ~-
. ~
---=~~·~~-·~·,--~-~--~~~···~-~·-~·--·~--------------~------~· ·~----~~~~~~~-~-~~·~~-~~··~~-~~-~-~~~-~·~-~~-=··~-··~~-----~~~
01 .
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tO)
2.0}
~Q). ..... .,oc.
:0 :e;
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401 >.. .Q .._ ,. '&I • &~ ·"-·o ..
0
0
.....
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SQ
9()
&O.Q
0.001
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DRAWN OY DL
APPROVEOBV
DATE DEC .. 1:980
PROJECT NO. 052504
---=•---
'
U.s. ltOAJkH'i!l sm. O,fil!At• ta lac:h•o . U.S. Sicm49ril at•v• thlilliltra H¥*o•star
100
3 2 tf!l i li t/2 "' 5 .. 6 e I) l4 &6 20 30 40 5D 6010 too 140 200 20
I I II l I I I . ,-..... I I • I (}
1\.
\
90 --.~ {0 ¥
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8.0 ~ 2.Q '\.. ..
70 ' 3Q -\ ~ -' 0 .c '·
01 -· -• i :k
~ 60 40-'>. .Z:. .
.5-......
-~-.... • • • .E 50 50 ;;;
lL a u
1: -• 4n ~ :«;:.
u . •• ... ·u • . .....
~ •• fQ.
30 1Q
20 8Q:
10 90:
1
o,oo 100
00 10' 5 I 0.~ O.l 0.05 0.01 0.005 o.oot -
Eiant :RiVfl fiot
_ Groin Size in Millimeters
J Coorsc MtdiJU'NOI Flnf I SILT ot CLAY I I . . 0
.
SAMPLE N<l ~~~~~· DRY Ll PI CLASSIFICATION 8 DESCRIPTiON .;;.,.. . DENSITY
AH-El-4 27 .• 3 ML SANDY SILT
{2. 0-3. 5'1 ..
--.
--
. ---
DRAWN BY Dt ..
R *. :· BORROW AREA E APPROVED BY
-M-C 0 N SU L "tANTS~ INC. DATE DEC,. 1980
' ~ -. -t PROJE.CT NO. 052504
'
,-..... " .
u -0
1\'J' ..,.
N
U, S. Stlllltkrll SieVe Op ... p ia taGa.ea U.S. StMifer• Sieve N11•tl•••
100
;s 211/l I 114 1/2 va .3 4 fi • &0 14 A6 20 30 40 506070 100 _140 21)0 270 ..
~ I I I~ I I a i I l r -. -.-. I I I I I
~
~ 90 r"'"" ~
80 ~
·"""'-"'~ .,
70
r-..,... -A:
0 I'
~
•• 11.. ~ 60 "' l' ... """~ .5 50 "' IL -"' c • 40 u
I\!'-. ... • G.. :',
30 ·I* ~
20 i'..
' I'-
10 " ill
\
0 .100 so ao 5 ' • 0.5 0.1' cos
Gtoin Size in Millimeters
I Cogru
GftA~~:
IFint I Coarse I Mtdfu!ANOf Fint I
.,
SAMPLE NO. ~~~t':f DRY ll Pl. CLASSIFICATIOI\. a DfNSflY
AH-El..-6 4.4, SP..-SM GRAVELLY SAND
if4 5-6 .O'l Poorly Graded
.
' -:-:.~ .. 0
R $ Bt )RROW AREA E
~ C 0 f\1 SU LTAN.TS,. lNC~
'
-.~ ..
... , ...... , .
~ 0
'
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'
20
' -'30 ..c
D --• ~
4:0 .&'
~ •
'50· :!
0 ~
• -6Q c
I
. ... ..... • 0..
.lQ
80
SQ
10&
0.01 0.005 0.00&
J .. .
SILT or CLAY
>--····
DESCRIPTION
~-
: DRAWN BY llL
APPROVED B'(
DATE OEC. 1980
PROJECT NO. 05250~
-·--.. ~--...... - ---·--. ----
. .
u.s. St~4 ••• Op~e• lA lacttea· U. a. SICIIiftfll Sieva H~b1ta Hr4roaehr
100
5 2. • 112 j_ l-1. Ill! 3 4 & e 10 ... 16 20 30 40 fi06070 100 t40 200 270
I ., I :• a ' l T ll if I i .I I I Q'
Jl 90 \. IQ) \
\ ;
60
.
2,Q';,
. ' It -\ 70 ~QI -\ :..s:: -!0
.&:: .o -·~·
,.,
•• ~
3t 60 '~ 4.Q/-~
I; ~· ..
..:.Q ,.._
... ,.
. 5 1\.
, .
50 5Q) '"'" 'iCI
lL ~ .. .. .···· 0
"(.) -1\ ~·-c: •. ·-.. 40 •C u ........ '6P' ~ ....
G ' :U
4..
...
~ • :A.
~Q ~ lQl
20 " ·~ ...... t'-.· ,.,.,
~ 10 9~
c ~
~·
0 toD so lO ~ I 0,5
lO.Q
0.1 0.05 O.Ol 0.005 o.oot.
Groin Size in MlUimeton
I §ftJV~t . I ~HD .
Firi: .I J Cogru Cogrso I Mtdty I SILT or CLAY fane
t.lOi"'iiA£ SAMPLE NO. ORY Ll PI CLASSlflCATION a DESCRIPTiON COHTEttT DE~SITY ..
hH--EJ...-7 0.7\ GW SANDY GRAVEL
Well Graded -~ -~, " ..
(6. s-a .. o• >
,.
:
' .
'
.. DRAWN BY DL
R ·~ M
.BORROW AREA·E APPROVED BY
CON.SULTANTS, tN·c. DATE DEC 1990
PROJECT NO . 052504 --..
·a
Q
~
N
U.S. SI1Ja$1QniiMVI O,IAIAQI ia lcatmtt
100
, 2 a Ill • ~ 112. 3/1 3
I I il I
90
80
70 -&. a. .
•• .~· 60
~ .... . 5 50 u.. -c . • u 40 ....
ll
4.
30
20
to
0 aoo #
I_
50 &0
I fHiA~gb I Cogru fino
SAMPLE NOfSJ~ DRY NO. CONTEt.T Of .. SITY LL
AH'"'E4-6 17 •. 6%
(5. o..-6. s• 1
--
R $ M CON SULTAN IS~ ..
~·· --
4 6 • 10
........ ~ I
~
p -
s
I Coone I
PI
SM
lN G.
U.I.IIIIMCll4 Ji•v~ N111n1t1rt .
14 16 20 ~0 40 506070 100 l"iO 200 2:0 .
I B 'i I i I I
' "' ' ....
\.
~
' \ .. .
\
\
\.
\
•
~
I 0.5 0.1 0.05
Groin Size in Millimeters
SAND • Medium I ,. :-...
Fino ,_. "!
..
CLAS~.:.· :· ':lON a
<. --·SILT¥ SAND WITH TRACE GW\VE:L
;
1
'·
BORROW .AREA. E
-...... ... "-..~
"~····*'·
•
0.01 0.005
SiLT or CLAY
DESCRIPTION
~
..
=~· Q}
l
lQ)
2,€1}
l.Q .... :z::
0 -4t
~
4.0 ~ ;.Q
~ • • 5:0 .... .a ·o u -6QI c:
0
0 .... • B..
~
~
9Q,
100
0.001
_J
-...
....
""
..
DRAWN 6'( DL
APPROV£0 BV
DATE DEC. 1980
PROJECT NO. 052504
··•·· ·~·--. .
·1
J
.J
U.~ Ste-4 Git~o OptAIAQI ia ~tiO . u.a Shln4Gtd Sins t411lllhtrt HJtcitOIIlelor
:s 2 • IJ2 l 14 1/2 1/1 3 " 6 a 10 14 16 20 !0 40 60601() 100 l-40 200 210 !00 . I ~ • [I -. II il I I T I I I I I • ' I' Q}
' I 90 f\ lQ)
\ .
80 \ 2,Q
~ :
70 3Q} ·-\ " J:: -'0 .1::. ·-0 \ 0 ·; .~
~ 60 \ 40 ~ 1\' ... ... \ ,._
! ·• 50 ., ·'-·-· 5Qf a
u. k " .B -r-..~ i -40 6Q «: u ~ • ... :u
0 ....... l..
4.. ~ l. .
~0 ~
,_ (Qj •"
........ :
20 ........ 8()
10 ~ -SQ --.....__
r-
0 aoo ~0 ao a I 0.~ lOO
0.1 0.05 0.01 0.00~ O.OOl
Groin Sin in Millimeters GBfg:fin. .. I I Coot§!
SAUD I ] eog[u I M~dfum I Fint SilT or CLAY
SAMPLE NO. ·~~~~· DR\' lL Pl CLASSIFiCATION a DESCRIPl'tON CEt.SIT\'
AH-E7-3 2 .. 3% GP SANDY GRAV3L WITH TRACE SILT -
(2. 0-3.0 8 ) ..
r .
.
' ' -· .
DRAWN B'l DL
R ~ 0 BORROW AREA E . APPROVED tl'f
M CONSULTANTS~ lNC. DATE DEC. 1980
,,'! PROJECT NO. 052504
"
U. $. SIOnJMd Iitva Of .. ,, ia 11\Cllll
~-
U.t. Stoo4out Sieve Numlaira H;llloaejlf
100 3 2 a i.fi I It 112 'a 3 1 6 ft D 14 16 20 30 40 t\06070 iOO 140 200 270 .
I I II I II· '· I I ' I I ~ I i • I II Oi
.• ' ·~
90 \ IOI-\ ..
80 \ 2:0 \ -\ --
70 -., "30 ,: -•. ::0: .c: ca . -•• . \ . • ~ ~
~ 60 4.0:: ~ '
~ \ ~
' -._ \ • .~ 50. 5()} :e
\ 1&1 u.. . • 0 u
t:
lilll 40 ' ; \ -u .., ... ,,. 6() iC ... •
0 v
'L.
0. .•.
~ ~ •.
30 . ~ 101
20' -~
~~
tQ ,? ~Q
·;-H-i!'-~ .
i i i '
0 100 50 ' lOQ
lO !S l 0.5 6.1 0.0~ 0.01 0.005 O.oot
Gti:iin Size in Millimeters -I GBA!J!tL I j ~~HD ~; : I ... ~
Cogru I Fin.t Coatu I Mid :u-.: I Ft== SILT or CLAY , . : ....
. .
SAMPLE MOISTURE DR\'
.If ~. jij <~
NO. CONT£NT DENSITY LL f'l CLASSiflCATION a OfSCRlPtlON
AU-E9..-2 15 .. 7% SM SILTY SAND
>
(1. s .... 3 .. fl\ 1 Poorly Graded ··~
.
-~>-\.i-"'c--. -
'
------· ... -DRAWN 8¥ l')J.j
R $ BORROW AREA E APPROVED 8'(
M CONSULTANTS, INC. OAT! DEC ... '1990
PROJECT NO. 052504~
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SEISMIC-REFRACTION SURVEY·-WCC