november 18-19) · i i i •• i i i i i i i i i i i i i i i .. attendance: q time &...

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fffi£~~£ c @liD&®©© Susltna Joint Venture Document Number

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HAr;~_l\.,EBASCO $n'7't '? . ~oint Venture

Document tJumber

Pl~~se Return To ~~f!t"}~~iE~~T CONTROL

SUS ITNA. HYDROELECTRIC PROJECT

EXTERN1~L REV I 1:W BOARD

f~EETING

NOVEMBER 18-19) 1982

Acres American Incorporated 1000 Liberty Bank Building Main at Court Buffalo; New York 14202 Telephone (716) 853-7525

I I I I I I I I I I I I I I I •• I I I

SUSITNA HYDROELECTRIC PROJECT

EXTERNAL REVIEW BOARD

MEETING

NOVEMBER 18-19) 1982

ACRES AMERICAN INCORPORATED 1000 Liberty Bank Building Main at Court Buffalo, New York 14202 Telephone (716) 853-7525

I I I •• I I I I I I I I I I I I I I I

..

Q

Attendance:

Time & Locati·on:

09:00 09:10 09:20 09:40 10:15 10:30

11:00 11:30 12:00 i: 00 1:20 1:45 2:15 3:00 3:3G

PROPOSED AGENDA

SUSITNA HYDROELECTRIC PROJECT

EXTERNAL REVIEW BOARD

Dr. Ralph Peck Dr. Andrew Merritt Dr. Harry Seed

18-19 November., 1982 Anchorage

APA - Introduction Acres - Introduction Scope of Summer Program Geology of Watana Relict Channel Coffee Break . Material Properties of Watana Relict

Channel Borrow Area D Fog Lakes Relict Channel Lunch

· Dams i te Geo 1 ogy , Upstream & Downstream Porta 1 s

Scope of Winter/Summer Programs Rockfill Concrete faced Dam Discussion Wrap-up Summary of Board's Ccrnments

D. Wozniak c. Debelius s. Thompson s. Thompson

D. W. Lamb D. W. Lamb s. Thompson

s .. Thompson s. Thompson, s. Thompson D. W. Lamb

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- SCOPE SUMMER PROGRAM

I I I I .I I I I I I I I I I I I •• I I

DAMSITE

OBJECTIVE OF

82 SUMMER PROGRM~

WATANA RELICT CHANNEL

BORROW AREA D

FOG LAKES RELICT CHANNEL

I •• I I I I I I I I I I I I I I I I I

DAMSITE

EXTENDED GEO LOG I C ~1APP I NG

CONFI~l & REFINE GEOLOGIC INTERPRETATION

DETERMINE ROCK CONDITIONS & OVERBURDEN DEPTH BENEATH PROPOSED MAJOR CIVIL STRUCTURES

•

I I I I •• I I I I I I I I I I I I I I

BORROW AREA D

DEFINE STRATIGRAPHY & EXTENT OF IDENTIFIED UNITS

DEFINE GEOHYDROLOGY & PERMAFROST

MATERIAL PROPERTIES

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I I I I I' I I I I I I I I •• I I I I I

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WATANA RELICT CHANNEL

DEFINE STRATIGRAPHY IN UPPER 200 FEET

FURTHER DEFINE CHANNEL GEOMETRY

DEFINE MATERIAL PROPERTIES

DEFINE GEOHYDROLOGY

DEFINE PERMAFROST CONDITIONS

I I I I I I I I .

I I I I I I I I I I I

FOG LAKES RELICT CHANNEL

- DEFiNE CHANNEL GEOMETRY

I I I I I. I I I I I I I I

-· I I I. I I

SCOPE OF 82-SUMMER PROGRAM

DRILLING - 16 BOREHOLES IN BORROW AREA D/RELICT CHANNEL

SEIS~1IC REFRACTION SURVEY

- 22.,000 LF-DAM SITE - 16.,000 LF-BORRO\v AREA D/RELICT CHANNEL - 45.,000 LF-FOG LAKES

GEOLOGIC i~APPING - DAM SITE

~LOCAL

REGIONAL - BORROW SITE

D

E

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LABORATORY TESTING - ATTERBERG LIMITS - GRADATIONS - HYDRO~iETERS

- MOISTURE CONTENTS - PROCTORS

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POTENTIAL PIPING

POTENTIAL LIQUEFACTION

POTENTIAL SETTLEMENT DUE TO SATURATION AND PERMAFROST THAWING

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STRATIGRAPHIC COLUMN WATANA RELICT CHANNEL AND

BORROW SITE 0 AREA

TYPE EVENT

SURFICIAL DEPOSITS· EROSION a FROST HEAVING

ICE OQSINTEGRATION ABLATION a MELTING ADVANCE

ALLUVIUM l~ERGLActA~ ___ _/' .--~--.--

LACUS"2"£U .. II!!! IOU .. Iiiiio PONDING LAKES INTERGLACIAL RETREAT

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OUTWASH MELTING a RETREAT -...-.-. ~ .._, - ---

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G) TILL ADVANCE

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8 BEDROCK

COLUMN

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2300 Sl-SW-3 W Sl80-7

AH-19 W 2240 DR-22

. 2180

AH-20 a.;A/8

2120 c

2060

2000

BR·SL

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1940

1880 K K

1820

1760 BR

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22.00

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2020

1960

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1900

1840

1780

1720

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2400

c 2340

2280 F

2220 G

2160

--- -;rl~----------~~~-------2100 o•

2040

1980

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1980

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2220

2160

2100

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- MATERIAL PROPERTIES - RELICT CHANNEL

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TEST PITS AUGER HOLES ROT PRY/CORE

BORINGS

COE

SUMMARY OF INVESTIGATIONS - WATANA

RELICT CHANNEL & BORROW SITE D

fl.fl. I 1£78..... . . . .. . . ... 1980~81

AAI 1982

14 24

11

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14 0

29

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---------------·-------.------------------... ---n.--------------------------------..... -.------------------------, ..... ---... -------------.-----.----------------------

LABOP.P.TORY TESTING

SOU~CE OF .. SAMPLES #. SA~1PLES GRADATIONS ~10lSTURES ATTERBURGS

TEST PITS

ftliGEP. HOLES

ROTAPY/COP.E

BORINGS

TOTAL TO Dfl.TE

51

219

570

840

ACRES AMERICAN INCORPORATED

51

83

416

550

2

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441

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UNIT

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G' H

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HATANA BORROW SITE D 8, RELICT CHANNEL

STRATIGRAPHIC UNIT THICKNESS <EST)

RANGE OF THICKNESSES R.C. AVG,

SURFICIPL 0 - 7 FEET 3.5 DISINTEGPATION 0 - 40.5 11.0.5

. ALLUVIUM 0 - 55+ 4.6 LACUSTRINE 0- 38+ 2.·4 BASAL TILL 0 - 79 3.8 OUTWASH 0 - 131 39.9 LACUSTRINE/TILL 0 - 73.5 2?.3 ..

BASAL TILL 0 - 231 17.2 '" .... ,.....

ALLUVIUM 0 - 41 7.4 OUTvlASH/TILL ? 0 - 77 29.2 LPCUSTRINE/STRATIFIED 0- 48 3,6

TILL 0 - 62 20.8 ALLUVIUM 0 - 161 15.6 REDROCK

BORROW"D"AVG.

3.0 12.4 6.2 3.0 . 5.€

47.2 29.5 25.2 lU.O

25.8 10.2 22.4 57.3

NOTE: ALL UNITS EXCEPT ~&B~ C., E/F" AND G HAVE STP.NDARD DEVIATIONS , IN THICKNESS EXCEEDING PVERJlGE UNIT THICKNESS. THIS IS STRONG INDICftTION OF THE V,ARIAEILITY IN liNIT THICKNESS P.ND DISTRIEl!TION.

. ACRES AMERICAN INCORPORATED

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I I I I I I I I

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WATANA

BORROW SITED

ARfA - 1075 ACRES <ARBITRARY DEFINED LUUT)

UNIT AVG I THICKNESS EST. voLur'E

AlB 3 5 c ]2 21 D 6 20 n·' 3 5 f4 6 10 ElF 47 82

-77 133

75 125

125 220

.

---~--~~--------- --

US. Standard Sltvt Optnlngt In lnchu U.S.Siondard SIIYI Numbtra Hrdromtttr

100 -- 12 9 s 3 2 li/2 I 3/4 1/2 3/8 4 10 20 40 eo 100 1-40 :zoo 270 : -· 0 -~ 'I l"f 11 ,._ ~ [T I' I ¥ I I jl

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........ !-...... 10 -... 90

Otaoo ~00 100 ro D & I 0.15 Ql 0.05 0.01 0~ 0001100

GRAIN SIZE IN MILLIMETERS

BO.U..OERS COBBLES GRAVEL SAND FINES

I Coarse I Fine Coarse Medium Fine Silt Sizes C~ Sizes

• LAB TEST NO. BORING NO. SAMPLE NO. DEPTH CURVE SYMBOL CLASSIF&CATION SUSITNA HYDROELECTRIC PROJECT

IV82 8v/f Sa.,~ ~~u (~) ALASKA POWER AUTHORITY I

. WATANA BORROW SITE D 0

AND RELICT CHANNEL

UNIT c I

GRADATION ANALYSIS CURVES ~-:-_---- --~ ACRES AMERICAN INCORPORATED .

----~-------·--~---.

US. Slal\dard Sltvt O~lnga m tnchu U.S. Standard SliYt Numbora Hydra meter

tOO ~.-- -- 12 9 6 3 2 11'2 I 3/4 1/2 3/8 4 10 20 40 ao 100 140 200 270 . I I II ~ I II I II fT II I t I I II 0

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20 80 .

10 90

01000 500 100 :0 D 6 I 0.0 Ql 0.05 0.01 0005 QOOllOO GRAIN SIZE IN MILLIMETERS

BOU..DERS COBBLES GRAVEL I SAND FINES

Coarse -~ Fine lcoorse Medium Fine Silt Sizes Clo1 Sizes .

• LAB TEST NO. BORING NO. SAMPLE NO. DEPTH CURVE SYMBOL CLASSIFICATION SUSITNA HYDROELECTRIC PROJECT

15u/ h (I) WBZ.- ALASKA POWER AUTHORITY

WATANA BORROW SlTE D AND RELICT CHANNEL

UNIT D' -

GRADATION ANALYSIS CURVES ~REs AMERiCANiNc"'ORPoRATED

------------~------

~

US. SlcMord Sieve Opening• In lnchu U.S.Standord Situ Numbtn Hydrom&ler

100 - - -- 12 9 6 3 2 11/2 I 3/4 1/2 3/8 4 10 20 40 10 100 t40 200 270 -1- I ,. I r ,. I" I 1' "f ~ II 0

~ --~ ' 90 \

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10 r--.

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30 - ....... !' r--....._ -£! :-, &: 00 ,, r-... c. CD .............. 4 •• 3:60

.... ~ -............ 40 ~ .,., ~ .Q

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~ ..... ........ " - .....

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""' " 0 - ~ u c:

" 40 "":--. ""-- .....

60 -u c: ... • ., ' : 11 u

Q.. ... ......... Ill

30 70 Q..

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20 ~ 80 ...... :--,... ... r- r--;

10 ......... 90 ..........

I ~ ,u._ -

otOOO eoo 100 50 D & I 0.& Ql 0.0~ 0.01 0~ QOOIIOO GRAIN SIZE IN MILLIMETERS

BOLl.OERS COBBLES I GRAVEL I SAND FINES

I Coarse I Fine !Coarse Medium Fine Silt Sizes Ct\l,'f Sizes

[ii] LAB TEST NO. BORING NO. SAMPLE NO. DEPTH CURVE SYMBOL CLASSIFICATION SUSITNA HYDROELECTRIC PROJECT

w"z.- (3lll..k (/D) ALASKA POWER AUTHORITY

WATANA BORROW SITE D AND RELICT CHANNEL

UNIT E/F '

GRADATION ANALYSIS CURVES AcREs AMErucANlNCORPORATED 'C

-------------------..

. US. Standard Sieve Openings In lnchn U.S.Stondord Sltwt Numhr1 H~dromtter

100 12 9 6 3 2 .11/2 I 3/4 1/2. 3/8 4 10 20 40. 10 100 140 200 270 ' I'

._ ~ • I' I' I I I I I r-.... i

0 ~ ~ ., . ._r-

!-r- r-. " 90 ...._ 10 r-- I& I' -

\ :- r--. r-. r-. 80 ~ ........

20

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'- ~ Q) 50 50 • c ~ t--r-- • u: ... t--.. 0

r-- c - " 0 c 40 60 tJ ........... -u c:

t.. " • II

.. ~ u ~ Q.. w

30 . 70 Q..

f" ... 20 so

10 90

01000 ~00 100 ro . I) 6 I 0.15 Ql 0.015 0.01 OJ.X>5 oooa100 GRAIN SIZE IN MILLIMETERS

COBBLES GRAVEL SAND FINES

OOU..DERS Coarse I Fine Coarse Medium Fine Silt Sizes ~~Sizes


Olr !s ( /8) ALASKA POWER AUTHORtTY

WATANA BORROW SITE 0 .. -··-

AND RELICT CHANNEL

UNIT G

GRADATION ANALYSIS CURVES 'AcREs' AMEmcANINCORPORATEo .

------------------··--.

llS, Standard Steve 0!*'111gl In lnchu U.S. Standard Sieve Numbers H,dromelsr

100 ~ ~

12 9 6 3 2 11/2 I 3/4 1/2 3/8 4 10 20 40 80 100 140 200 270

'i'-I l ,. ~-..!_~-~ I 11 I I I I I' 0

........

" -I'"!"-- ... -•!"--

90 -M. ~ --:..... ......... -'-.... 0

,. 10 t-.. I'-

"~ ""'--- -!-----80

""' :-r- r!.. ~ 20

- -"r-. ............... ........... :Y

70 i' ......__ 30 - ~ .c .. -.c co

'" ...... 01

II) b... -...1!. • ~60

';;......... !'...... 40 3t ,.. :>. .Q

, .. ------~ ~ .Q

... ... II) 50 50 • c: -.f... ....

:"-:-. .. ·- r- '-u. .. Q

........ r-........... tt - ' 0 c

w 40 ~r-. 60 -u c:

t.. .... (ol 4l I' I

u a. r.. -.. 30

''-... 70 0..

20 ~ 80 "

10 90

01000 500 100 eo 0 15 , I o.s Ql 0.05 0.01 0005 QOOIIOO GRAIN SIZE IN MILUMETERS

BOU..OERS COBBLES I GRAVEL SAND FINES

I Coarse I Fine Coarse Medium Fine Silt Sizes ~Sizes


Bdlk ( /O) W$7..- ALASKA POWER AUTHORITY

. WATANA BORROW SITE D

AND RELICT CHANNEL

UNIT G'

GRADATION ANALYSIS CURVES 'ACRE'S AiEmcANINCOR'PORiTE'D

-----------...------ --US. Standar4 Slave Oponlngt In Inch" U.S. Standard Slnt Numbtr a Hydrometer

100 - .---- 12 9 A, 3 2 11/2 I 3/4 1/2 3/8 .. 10 20 40 10 100 140 200 270 I ... .,; 0 ----..;::r-- :-rtt

I • -........ '"- ~ --- - .......

1--:--~ 9-... :'II~

r--~ ~ . 90 r--,.11

~ -~ ,.. r-- I'-rT"oo.

i"- "" 10

r--..... \ '\ !1"' i'-- /

~ ' 80 .......... 20 \ ~ fl.~

~, ~ .......

"""" 70 r-

30 ' .... , - ~ ' 1'- -.c J.: Clo

0 0 Q) ..........

I'.. ['-,. ~ • ~60 ......... !'\.~ 40 :l >. ......... ~ .Q

"" " ~~ r-...,._

\... ~ Cl) "50 00 • c: r•...., ~ ............. i"'t--. • ·- '-

LL ' 0

'!'>... -"" ..... 0 - ' u c:

40 -«< -' ~"-'l 60 -u ~ !:)

.......

' c: ... • 11.1

' I'... u

Q.

' ..

....... • 30

' ' 10 Q.

' 1'--.. .,

20 ~ ~ 80 "'!ooo .......... 1'..., .... .......

10 1-oo..,

r--- '90 r---..

01000 ..

QOOIIOO . -

~00 100 ro [) 5 I o.a Ql 0.0!5 0.01 0005 GRAIN SIZE IN MILLIMETERS

BOU.DERS COBBLES I GRAVEL J SAND I FINES

I Coarse I Fine !Coarse Medium Fine l Silt Sizes C~Sizes


II? 's X ALASKA POWER AUTHORITY - ri 's 0

' WATANA BORROW SITE D .. AND RELICT CHANNEL

/ILL CoE TPJ/IP 0/177)

GRADATION ANALYSIS CURVES 7cREi AMERtCANlNCoRPORATED

I I I I I I I I I I I I I I I I I I I

UNIT c

D

D'

M

E/F

G

G'

H

I

J'

J

..

t' PCINTS We flTT.

64 4

23 5

10 2 ~

37 5

120 33

20 2

6 2

1 0

3 1 0 5 10 15 20 25 3D 35 40 45 50 55 ffi:·

WATER CONTENT {0/o)

NOTE: ·~ = MftXIMUM MATERIAL PASSING 3/4 11 SIEVE

x = MINIMUM l:J = PL (MEAN)

• = W (MEAN) c

Note: Plastic limits are biased towards higher (more plastic) values. Upper limit of moisture contents are extreme, rare cases; well above means.

----------------We-oJ 1\ .

60 . I I I ., T I I I I T I I I I I I . r 1 I I I I l I I I / • I . . . , 1 .• 1 I .I I .L 1 .I • I 'tt I I _1. _I_

!fW PkASTICITY OR Pl:ASTIC OR ''FAT CLAYS - . EA~ CLAYS.~ ~ILTS . 8 SILTS ' . . .

50 -

- CH

J '

'l !.

~ ! .

.

}.

ld

40 ~·

~ . ~

[...;

"" ~ ~~~ "'\ ~ • c

~ 1 ··~ , ?: ~ . -30 . u Ill' i=

~ ~ ~

Q. !.It CL I"

- '-"' ,.. 20 ~

. ,.,.

(11 •.

'-,__ i-f- -I- 14'

~-~ 1.; MH aoH ~r- ~ '

~ - I i...-~--' ~

to ~

10 ~ 1 ....

. .,.. CL

. -~ 1..1

1.!. lJ. ,_, 1...-~ - . 4 I I,..- I ...

X ·-- ceML_ I~ ~ ~ . I l r'l I" ~ ML a OL ·

~~ 1-.T .I :, ~ -. . ML jl!

-0' I I l..t!li'"' I tiP .

J 20 0

10 30 40 50 60 70 ao I LIQUID LIMIT

TEST PERFORMED ON MATERIAL PASSING -o X -+~ NO. 40 SIEVE IN ACCORDANCE WITH ASTM 0423 ·66 Cl972} AND 0424-59 (1971) /JlL {)llJ ITS EsnmATC.O. ' I)IIJIIS <:. -F

--

.

I I I I I .I I I I I I I I I I I I I I

MJifl We

Uh•t E}F s.z"f, _6"'"

145 I I

IJ~~tl.i C '~~ I 1~'1

r _6""

) .!

I I

140 l i I i

-- 135 u 0..

)-.,_ (/) z w 0 I >- I 0::::: 130

I 0 l

,:.'6.4 I -

WATER CONTENT (0/o)

NOTE: :.~~TERIAL PASSING 3/4 .. srEvE

t\STM D '='<;& "'' ETih.a t> C...

MEifiV (Jflf ~ ""c.

Ji .I '/t ..,.o z,,, "lb l l I J

+<Si 2S'.1 '6

i I I I

I I i I i I

Q SA~ PLE W~"--;3.C. P fT 4


--0 c.. ->-1-(/)

z w a

>-0: a

145

135 ·~<\..2. 1---

1:.'3.. ~

132. I S-

134.. r -

!30

l.:l ~-5 125

t-

;111 f./ I MWf U ,.J NAT'JJ2A "

We. 5.J.. ., .. _l .

I

;\'1 f4. y. , ~ &} "'

Nf. Tlh'( .4 L

We..

.rtf

I l 120 2~~---4L__j ______ 6l_~L_~~48d&~~~e~-~~~,o~-L--:12~~--~~~4--~~,6

B.S"

WATER CONTENT (o/o)

UN II E. IF

0 wa'2..-.2. 1'•'l3~.!.c-,'3E,

8 VJ 62.- 3o

E) &J~- 44 'P\T.2.,.

0 wB2.-c:tl

(tCfe i AC..Kt' S. J


145

140

-:; 13~ Cl.

- I 34.0-- - ->-1-CJ)

z w Q

~ 130 Q

1.2.8-1 fi-p.i.3j----

125

x

mlPL u.81o

I

i I

I -------,-•

t

l~l:l-- _j __ ---f

I 2 0 L-----1--L--!..--L.. _ _,__..,__~~---~--:-_..._......_..;,._.-'---..___... ___ __.

2 4 6 7-'f 8 g..;~. 10 12 14

WATER CONTENT (0/o)

'RAtJ~t 6F ALL 'STANDARD

""P'Ro<..:T"o R. R ~tJL.-r~ "BOR.RD.J s tT€' D

/t'Escs

16

I I I I I· I I I I

I I I I I •• I I I

---(.)

c. ->-t-•. CJ')

z w a

>-0: Q

~:~TE :

145

140

135 13<(1f

130

125

120

I ' 1 1

~···-····

2 4

t'flltJtwu.JtJ tJ4TVfl.#a"w~

~.2. i'.

...__..,

~/;.. TERtAL PASSING 3/4" SIEVE

8

WATER •' ' ' ~J

----------!-----1

I

t ~

iif~~llltlll't\

NICT"Jil.-4"" w. ""·' i' ..

_j_ i ----- t~0 -8

I R "'

oDf''~o fl?-o 4<

f

-~ _,

i

14 16

8 SA \M Pt. e we z.- .2 p •• ~~ 3c. ) 3 t:.

0

A S'"LW\ D 1 s~ Yri e-rn. e c. (r18L AU::~~)

SA 1N1 f'L.. E W80-~o A As HTo T-teo m~l)b b

(.<:tao .tc::.~ £~ )

•• I I I I I I I I I I I I I I I I I ·I

145

140

-- 135 0 0. ->-J-(/)

z w 0

>- 130 0::: 0

t:li.B

125

120

I

I

I I ' ' I ' i I

I

,I I

-

~HM•~vt\1

NJ.1''1JIZA ,_ we. G. 0 ., •

! l i ~ I , I

1 I l

f '

I I 1 I

1 ' . • .

l I . i .

!

-~

l l I

I

I I f ...

I !

' !

I I •

I ' I

; '

' ' I l I ; . I •

. I

l .

I I

I

-v~

'\ I 1

7 I

i ----- --1----- -- ~+- --I l .

2 4 6 8 '1.5"10

WATER CONTENT (0/ 0 )

'. ""' ~ - ,':.;_ PASS:NG 3/4 II SIEVE

UN 1T ft

! ~ 1 ~ J

~ ;t lj ,, • !

' i

I

i I t

c

I ~ I ' ·--i

l t I

' I ,; i

I ! \

I -- r-- -

' t•

f 12

. ...

--r> (off' sr:.-le.)

I l I

;

' I l {

' I

I

~-r--

J

l"f't\1< /#A\ We.

91.1 -;.

14 16

0 SAV~-tPLc we~-~ ?tT s (a...,

I l f

Y'Vl oD 1Ft 'ED PR.oc_. ToR

I E

n

t t ·~

~

I I

tJU

;.U

u .llJ

:U

·~

·.u

- FOG LAKES RELICT CHANNEL

I .

··-=-------·------.........._._. __ ..._

-----·---~

I I

I

I l

I .

I I .I I I

.

I i

-l

1: I

I I I I. -

I I

rt r \ .?

\ !)

~ ~ ~ ·,

FOG UKES RELJCT CHANNEL EXPLORAT\ON MAP

-

.. r? ~-

r _:__ ~!

( .•.

< ~ ·,

""' ....

\ ~.~.

\

• I !~ sa&.C

]f) ' J'

tfi I . l liJ

l t>~

- DAM SITE GEOLOGY

- - .. - - - - .. - - - - - .. 10 • 7

Q

----,..

- .. -

0 D I

c c

• •

liXl -PUT

PLATE 8.1 A

WATf\N.\ VALl,'( l'I'PE Sf'IU.W•\\' 1\tTERNATM:

GENERAL ARnANG£MENT I

I • t • 7 t • • a

- UPSTREAM & DOWNSTREAM PORTAL

J

L

I I I

EXISTING DIVERSION ARRANGEMENT I

' 1, TWO - 38' 0 CONCRETE LINED TUNNELS

I 2. MULTI-LEVEL INTAKES

I EL 1420 EL 1490

I 3 .. LOWER TUNNEL REDUCES WATER LEVEL IN COFFERDAM

I FOR CONSTRUCTION IN STANDING WATER,

I 41 LOWER TUNNEL AT DO~INSTREAM TO BE USED AS TAILRACE

I 5. HIGHER TUNNEL REQUIRED FOR FLOOD ONLY

6. HIGHER TUNNEL USED FOR LOW LEVEL RELEASE - ~1UST

I BE HIGH TO AVOID SILTING

I 7. LOWER TUNNEL IS PRESSURE TUNNEL.

I 8. CLOSURE STRUCTURES REQUIRED TO ENABLE PLUG AND LOW WATER RELEASE TO BE CONSTRUCTED.

I 0

9. LOCATION OF TUNNELS SET BETWEEN COFFERDAM AND

I 1'THE FINS,, STRUCTURE.

I I I

./,r~~ --------:-.._..c_ _________________ _

SET II

042./85°NW

..

SET :m:

0.

. N

325o/90,

SET :r~

JOINT PLOT UP!-lTREAM PORTAL AREA

w

I '·

I I I I I I I I I .. I I I I 'I I I I I

. ./

ALTERNATIVE TO LOCATION OF UPSTREAM DIVERSION PORTAL

. .

1. LEAVE AT PRESENT LOCATION

2. LEAVE AT PRESENT LOCATION WITH MODIFICATJONS

3 . LOCATE uPSTREAM OF "THE FINS II

4, LOCATE FURTHER DOWNSTREAM

5. LOCATE ON SOUTH ABUTMENT

---- ..... _

... , .. / ---=

I Ill

.. ·--·--.. -----·-·· WATANA . DIVERSION TUNNELS

ALTERNATE ALIGNMENTS

I I I I I I I, I I I I I I I I I I I I

LEAVE AT PRESENT LOCATION

ADVANTAGES 1. , EXCAVATED ROCK CAN BE USED IN COFFERDAM

CONSTRUCT ION 2. GOOD HYDRAULIC LOCATION 3, REMOVED FROM ~1AIN CONSTRUCTION AREA·

DISADVANTAGES · 1. REQUIRES 300-FOOT HIGH CUTS

. 2. EXTENSIVE ROCK SUPPORT MAY BE REQUIRED 3. REQUIRES COMPLEX CONSTRUCTION COFFERDAM

ARRANGEMENT 4. DIFFICULT ACCESS PROBLEMS

I I -• I I I I Ia I ,, I I I-I I I I I I

PRESENT POSITION WITH MODIFICATIONS

MODIFICATIONS 1. SEPARATE PORTALS AND STAGGERED CUT FACES 2. MOVE CUT FACES NEARtR TO RIVER 3. REVERSE TUNNELS - MAKING LOWER TUNNEL ON SDUTH SIDE

f~OD IF !CATION #1 ADVANTAGES

- MINIMIZES SIDE ROCK CUTS - INCREASES WORK AREA

DISADVANTAGES - LESS EXCAVATED MATERIAL FOR COFFERDAM

. - INCREASES DIFFICULTY IN ACCESS TO NORTH TUNNEL

MODIFICATION #2 ADVANTAGES

- MINIMIZES ROCK CUTS - IMPROVES CONSTRU£TION SCHEDULE - BETTER CONSTRUCTION ACCESS

DISADVANTAGES . - REQUIRES LARGER CONSTRUCTION COFFERDAf·i AND GREATER

RIVER CONSTRAINTS - LESS EXCAVATED MATERIAL FOR COFFERDAM

MODIFICATION #3 ADVANTAGES

- LESS CONSTRUCTION PROBLEM FOR BOTH PORTALS - REDUCES ROCK CUTS

DISADVANTAGES - REDESIGN OF TAILRACE THAT COULD RESULT IN LOss-oF

ENERGY AND/OR LARGER TAILRACE TUNNELS - CONSTRUCTION PROBLEMS IN DOWNSTREAM PORTAL

I I I •• I I I I I ·I I I I I I I I I I

PORTAL MOVED UPSTREAM

ADVANTAGES

- PORTAL WOULD BE ON FLATTER SLOPES - REMOVES DIVERSION AS UPSTREAM CONSTRAINT ON DAM - MOVES DIVERSION CONSTRUCTION AWAY FROM MAIN DAM - INCREASED WORK AREA

DISADVANTAGES

- LENGTH OF TUNNEL - LARGER DIAMETER TUNNEL - POTENTIAL POOR GEOLOGY IN PORTAL AREA - REQUIRES EXCAVATION THRU 11THE FINS" - POSSIBLE OVERBURDEN PROBLEM - DIFFICULT ACCESS - POORER TUNNEL ALIGNMENT - IMPACTS CONSTRUCTION SCHEDULE

..................... --------------------------~~· - - - - .. - - - -· - ... - - - - ,.. - - -UPSTREAM DIVERSION PORTALS ~1AP

PRESENT DIVERSION PLAN

/ /

(

/ ---·-~

--~-\goo--

...... - ~------ --

ALTERNATE DIVERSION PLAN:

• / 0 "10. . . SO FEET

SCALE ! C:77?

I· I

I I I I I I I I

•• I I I I I •• I I I

DOWNSTREAM PORTAL

ADVANTAGES

- BETTER ROCK CUTS - SHORTER TUNNEL - BETTER GEOLOGY - EASIER ACCESS

DISADVANTAGES

- POOR HYDRAULIC ALIGNMENT - INTERFERES WITH COFFERDAM - REQUIRES THAT COFFERDAM COR PART Of) QBE

INCLUDED IN MAIN DAM OR~ REQUIRES FANCY INTAKE DESIGN

- PORTAL ALIGNMENT NOT AS FAVORABLE FOR GEOLOGY - MAY INTERFERE WITH MAIN DAM CONSTRUCTION - MAY REQUIRE UNDERWATER CHANNEL CUT


PORTAL ON SOUTH ABUTMENT

ADVANTAGES SEPARATED FROM ALL OTHER CONSTRUCTION ACTIVITIES

.. NO LEAKAGE CONCERN TO UNDERGROUND STRUCTURES - RELIEVES D/S PORTAL AND DOWNSTREAM COFFERDAM

CONJESTION

DISADVANTAGES - LONG TUNNEL - POOR GEOLOGY - POTENTIAL PERMAFROST - ACCESS REQUIRES BRIDGE

IMPACTS CONSTRUCTION SCHEDULE - LARGE ROCK CUTS AT U/S PORTAL - POOR HYDRAULICS - POTENTIAL IMPACT WITH COFFERDAM CONSTRUCTION - REQUIRES ADDITIONAL TAILRACE TUNNEL

- •• - - - - - -

WATANA COFFERDAM AND PORTAL AREA GEOLOGIC MAP

-

/ 8 /

,.,..-.,.,..--,..,. ...... .-..... ___ ~...!'

_.-- ~..._ _ _...T'"!:JI': 0 AUlJ'AIII -------......__ - <("" '-...__..~-- ,_... ---- --- ,-......., ________ _

- - - -

, ... I

FIGURE

- - -

l"f,.·'-· -~-ll:,, --------------------...-----!/

~~

!r

:c· i;

~1

I' : 1'

' ~<

r~ l' 1-;·

·r ::.,,

l )

tl [·

I -· - ;tJ

. t

'

!, )_{

;{

·' '1

t f ; I» " Jt

J.

' r·r---I·~! APU[il r-nUlua

\

'tit.

s

6

-I-I

N

Oo5•J8Q"E

SET m:

SET II

OS5°/9C/'

JOINT PLOT DOVJNSTREAr1f PORTAL AREA

' I

' ' I

• l . :

1700

17!10

... I~GO ... 1:! ~

"' 1520

0 ;: .. > .. 141!0 ~ ...

~•o

1400

SECTION A-A

- - -

.. ,

- -

1780

1720

1440

1400

- - -EL 149~ ... , ··~ _

SECTION B-8

- -

_...--··---···

t I 1

I 1 r t

SECTION C·C

- -

0 0

~ ;! z

·---· . !

[1.1500

GUIDE WAlL AltOIORto TO ROCK

' ,J.,.,.

F\.lP Bllt~ET TO 1!E: ~ll!\ICTEO AFTU. M'tltSIOH

STCPlOG GU!CE:

·f. ~L .1~09

I i EL 14!10

... t

L ,\', -~!!-c~~

Ill'

"'-2 :L:;a L,. EL 1440

SECTION D-~

'<I~ • 40 f£El)

WATANA OOWNSTREA~ ~ORTALS

PLAN 6 SEtTfONS EXHIBIT F 1'\.ATE F20

- - - - -

----------------- -DOWNSTREAM DIVERSION AND T.AILRACE PORTALS MAP

ALTERNATE LOCATION

·---

'----··~

~.~ .....__

-~- """"'- .... ,

·----------- 1700 ---- ----·------·- --·-------.. --

-

t; ... ... !:

-

1600

% 1500 0 ;:: ~ ~ ...

1400

1600

.... ... ... ....

= 2i 1500

ti >

d

'"' [

-

ELI450

- - - - - .. - - - - - -DOWN~TRJ;AM DIVERSION PORTALS SECTIONS

..... ·-ACCESS ROAO

,r-STRIP TO ROCK /

I I

ROAO

Alli:RNATE DIVERSION TUHIIEL NO I

/ACCES:> ROAD ~;>-·

/·STRIP TO ROCIC

At:TERHATE TI.ILRACE TUN!ia

ALTERNATE DIVERSION PLAN

AZIMUTH 045• ~F SECTION __..225•

SUSIYNA RIVER

...... ........... .........

..... , .. '~· --

SUSITNA RIVER

LOO!<ING UPSTREAM

1600

t1 .... = 1500 z 0 ;:: ~ ... ... ...

1400

/

.... ~ TUNNEL

AIIERNATE TAILAAC£ I DIVERSION TUNNEL NO 2

1 ..

5 • .,.".-AZIMUTH _.,.

1..,.

" OF SECTION "" "' LOOKING NORTH

SECTION A•A

- -

SUSITHA RIVER

COFFERDAM EL 1412

0 SCALE I

- -

- SCOPE OF WINTER/SUMMER PROGRAM

I I I I I I I I I I -I I I I I I I I I

DA~1SITE

\~INTER GEOTECHNICAL PROGRAM

OBJECTIVES OBTAIN DESIGN LEVEL DATA TO FINALIZE GENERAL ARRANGEMENT TO ESTABLiSH CONSTRUCTION COSTS AND SCHEDULES

DATA TO BE OBTAINED:

SCOPE

- ENGINEERING PROPERTIES OF BEDROCK & ALLUVIUf~ - THICKNESS OF ALLUV I U~1 - DA~SITE GEOLOGY - GEOHYDROLOGY

APPROXIMATELY 2000-LF HAMMER DRILLING - COFFERDAM - MAIN DAr~ - DOWNSTREAM COFFERDAM - U/S PORTAL - PLUNGE POOL

APPROXIMATELY 15)000-LF SEISMIC REFRACTION SURVEYS ~ - U/S COFFERDAM

- ~lAIN DAM - DIS COFFERDAM - U/S PORTAL - PLUNGE POOL

I I I I I I I I I I. I I I I I I I I I

WINTER GEOTECHNICAL

PROGRAM

RELICT CHANNEUBORROW AREA D

OBJECTIVES

SCOPE

OBTAIN DESIGN LEVEL DATA TO DETERMINE ENGINEERING AND DESIGN REQUIREMENTS AND TO DETERMINE CONSTRUCTION COSTS AND SCHEDULE.

- DRILLING APPROXIMATELY 4J30fi-LF BY HAMMER DRILLING INSTALL PIEZOMETERS AND THERI'~ISTORS

- INSTALL WELLS - PERFORM FIELD PERMEABILITY TESTING

I I I SUMMER 1983

GEOTECHNICAL I PROGRAM

I OBJECTIVE -:

I TO CONTINUE IN OBTAINING DESIGN LEVEL DATA

I SCOPE

I TECHNIQUES TO BE CONSIDERED: - MAPPING I - REMOTE SENSING - DRILLING

I PLUG/PROBE CORING <VERTICAL TO HORIZONTAL)

I OVERBURDEN SAMPLING - EXCAVATION

I TEST TRENCHING TEST PIT/BLAST

~

CAISSON/SHAFT I ADIT SURFACE GEOPHYSICS -

I SEISMIC REFRACTION SEISMIC REFLECTION

I RESISTIVITY RADAR

I ETC. - DOWNHOLE INSTRUMENTATION

THERMAL I PIEZOMETRIC

I DEFORMATION

I

I I I I I I I I I I I I I I I I I I 1

{t - DOWNHOLE TESTING PERMEABILITY SEISMIC. VELOCITY IMAGERY DENSITY/MOISTURE r10DULUS HARDNESS IN-SITU STRESS INCLINATION DEFORMATION

- MATERIAL TESTING ROUTINE SOIL & ROCK TESTING DYNAMIC TESTING CONCRETE TESTING

- ·- - - - -- - .... ! - - - - - - .. - - -

~~~~f~l WATANA 1982-85 PROPOSED GEOTECHNICAL INVE.STIGATION PROGRAM

1982 1983 1984 , JFMAMJJASOHDJFMAMJJAS01NDJFMAMJJASOND .

BORROW AREAS INVESTIGATION/ RESERVOIR

GEOLOGIC MAPPING

DRILLING a TESTING

LABORATORY TESTING

GEOPHYSICS

RELICT CHANNEL INVESTIGATION

DRILLING a TESTING

LABORATORY TESTING

DAMSITE !NVESTIGATION

GEOLOGIC MAPPING

GEOPHYSICAL SURVEYS

DIAMOND DRILLING

RIVER DRILLING

TEST ADITS

LABORATORY TESTING

. ~

1m - I ~ .

-I;:

• • • "'

I

ill Ufll

.

~~#l •II 'Ill ~ II ~~ ~-:;

I!

:1;n, '""

I ~

I II [I il [Ill

--~ = \!(, r.~r!: .:~-: ~-tt: J.~ll

- ROCKFILL CONCRETE FACED DAM

I I I ,I I I I I ·I I I I I I ~

I

•• I I ••

CONCRETE FACE FILL DAM

AT WATANA

I I I I I I I I I I I I

' I I I I I I

CONCRETE FACE FILL DAM ALTERNATIVE AT WATANA

PERCEIVED ADVANTAGES:

I ELIMINATION OF EARTH CORE LESS DEPENDENCE ON WEATHER

CONDITIONS

I STEEPER SLOPES

1,5:1 INSTEAD OF 2 AND 2.4:1~ HENCE

LESS MATERIAL LESS FOUNDATION PREPARATIONS fv10RE FLEXIBILITY IN LAYOUT - PARTICULARLY TUNNEL PORTALS

I IMPROVED SCHEDULE

I IMPROVED STABILITY UNDER SEISMIC LOADING

I STABILITY NOT DEPENDENT ON INTEGRITY OF FACE SLAB - CAN

WITHSTAND VERY HIGH LEAKAGE RATES

I LOWER COST

I .I I I I I I I I •• I I I I I I I I I

• •

• • • •

CONCRETE FACE FILL DAM ALTERNATIVE AT WATANA

DISADVANTAGES:

NO PRECEDENT FOR HEIGHT - 70% INCREASE OVER AREIA

NO PRECEDENT FOR CLIMATE

NO PRECEDENT FOR SEISMICITY

MUST COMPLETE ROCK FILL BEFORE CONSTRUCTING FACE SLAB

PRECEDENTS INCLUDE IMPERVIOUS EARTH COVER BASE OF FACE

LATE START FOR IMPOUNDMENT

DIFFICULT AND COSTLY TO REMEDY ANY LEAKAGE THROUGH FACE SLAB

I I I I I I I I I I I I I I I •• I I I

1.

2.

3.

4.

5.

DAM

SALT SPRINGS

PARADELA

ALTO ANCHICAYJl.

ARE IA

vJATANA TABASARA LA MIEL

CONCRETE FACE FILL DAM

PRECEDENT STURCTURES

YEAR COMPLETED

1930

1955

1974

1980

198? 198? 198?

HEIGHT FEET

330

370.

460

525

885 590 650

% INCREASE

12

:24

ll.f

68 12 24

• 300 '

WATANA !'( 270 ~

3 -:r.: (I)

()

200 " z c( LA MIEL .

en z <(

ijj --w - c( TABASARJ. I= E ..J 0 0:: ~~ w LIJ ~ c( -~ :E (/) c ~

z c( c( '?o - 0:: 1- ~ 0 0 3: . (!) 0 iii 0 0 ::t: 100

)( )( )( )(

XXX

8 )( X o Oo·

)( X 0 0 0

0 ~~------~--·--------~--------~--------~~ 1920 1940 1960 1980

COMPlETION DATE

CONCRETE FACE ROCK FILL DAMS '• -

-- .... -- -~ - - w - - ~- - - - -

I I I I .I I I I I I I I I I I I I I I

EARTH ROCK FILL DAM ALTERNATIVE AT WATANA

e 'WITHIN PRECEDENT - PROVEN STABILITY

e MATERIALS READILY AVAILABLE AT OPTIMUM MOISTURE CONTENT

I SELF-HEALING LEAKAGE

I EARLY START TO IMPOUNDMENT

I GOOD CHANCE OF INCORPORATING COFFERDAM(s) IN STRUCTURE -LAYOUT IMPROVED


EARTH - ROCK FILL ALTERNATiVE

SUPPORTING EVIDENCE

1. LG 2

I CONCRETE FACE APPROXIMATELY 5% CHEAPER ~

CONSULTANTS· RECOMMENDED MANAGER STAY WITH PROVEN TYPE

FOR SITE CLIMATIC CONDITIONS - NO PRECEDENT (PECK)

2. TABASARA

I BOARD OF CONSULTANTS CONSIDERED 180 M PRUDENT

MAXIMUM HEIGHT FOR CONCRETE FACE FILL DAM - 15% HIGHER THAN MAXIMUM TO DATE.

SEISMICITY- 0.4 G (COOKEJ DEEREJ.MAC DONALD)

I I I I~

I I I I I I I I I I I I I I I

USE CONCRETE FACE FILL DAM IF:

I ,NO SUITABLE CORE MATERIALS AVAILABLE

e HEIGHT WITHIN 10-20% OF PRECEDENT

I CLIMATIC CONDITIONS VERY \~ET

I RESERVOIR CAN BE DRAWN DOWN ECONOMICALLY

I SLAB NOT EXPOSED TO SEVERE FREEZE-THAW CYCLES

e EARLY IMPOUNDMENT NOT CRITICAL

• CHEAPER THAN ALTERNATIVE(S)

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