COPPER VALLEY ELECTRIC ASSOCIATION ALLISON ......POA-2008-1257, Allison Creek, Hydroelectri Project Copper Valley Electric Association, Inc. Lat. 61.0555 N., Long. 146.3481 W. Sheet

POA-2008-1257, Allison Creek, Hydroelectri Project Copper Valley Electric Association, Inc. Lat. 61.0555 N., Long. 146.3481 W. Sheet 1 of 45, May 3, 2013

COPPER VALLEY ELECTRIC ASSOCIATION ALLISON CREEK HYDROELECTRIC PROJECT

FERC NO. 13124 ·TRANSMISSION LINE JOINT APPLICATION FOR PERMITS

AJJJ!CTTC OCJ!lAJFI

LOCATION MAP NTS

NTS

LAT: 61.080351" LONG: -146.353116"

SECTION 19, TOWNSHIP 9 SOUTH, RANGE 6 WEST

TITLE: COPPER VALLEY ELECTRIC ASSOCIATION ALLISON CREEK HYDROELECTRIC PROJECT

FERC NO. 13124 -TRANSMISSION LINE LOCATION MAP, VICINITY MAP AND PROJECT MAP

VALDEZ-CORDOVA COUNTY, ALASKA

DRAWN: SHEET:

RG

CHECKED: 1 GA

DATE:

5/3/13 1 OF 11

TITLE:

----- ------- ----------

POA-2008-1257, Allison Creek, Hydroelectri Project Copper Valley Electric Association, Inc. Lat. 61.0555 N., Long. 146.3481 W.

Sheet 2 of 45, May 3, 2013

LEGEND

--- ~SUISSION UNE

#XX TRANSMISSION UNE POLE NUMBER


FERC NO. 13124 TRANSMISSION LINE KEY PLAN

DRAWN:

RG

CHECKED:

GA

DATE:

5/3/13

SHEET:

2 2 OF 11

TITLE:



FERC NO. 13124 TRANSMISSION LINE ENLARGED AREA 1

illOO

~~ STRFAM

ts2QS8888<i IMPACT AR<A

- • - lRANSMISSION UNE

31;! ~U li'IJIF. !lUMBER

0 T~lllilfili\IEI'il¥.111 il'l:t<E:

~~J3ii1[N1 :!lflY.lil!ll'ilil~

DRAWN:

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GA

DATE:

5/3/13

SHEET:

3 3 OF 11

TITLE:

WATERBODY

WffiAND A

WffiAND B

PERIMNENT IMPACT

315 sr

125 sr

TEMPORARY IMPACT

3461 sr

612 SF


WZlliQ.

W/J/Zl W~D fS<S&QS&Qj IMPACT AREA

- • - TRANSMISSION UNE

39

8 TRANSMISSION POLE NUMBER

TRANSMISSION POLE

56+00 STAllONING

- CL - CLEARING UUITS

TRANSMISSION LINE ENLARGED AREA 2 1 (X\ ~s~~-~~-~~~7D~.~~~~~~~~~~~,.~·~~,r~tt2/~

DRAWN: SHEET:



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GA

DATE:

5/3/13

4 4 OF 11

TITLE:


illlfNQ

IS'&.~ STREAM

~ IMPACT AREA

- - - TRANSMISSION UNE

39 TRANSMISSION POL£ NUMBER

8 TRANSMISSION POlE

56+00 STATIONING

- CL - CL£ARING UMITS

DRAWN: SHEET:

COPPER VALLEY ELECTRIC ASSOCIATION RG

ALLISON CREEK HYDROELECTRIC PROJECT CHECKED: 5 GA FERC NO. 13124 TRANSMISSION LINE ENLARGED AREA 3 DATE:

5/3/13 5 OF 11

~ i: "' e " ! < 1.1 1; ,;:

TITLE:




!mOO

~~ STRFAM

~ IMPACT ARfA

- - - TRANSMISSION UNE


8 TRANSMISSION POl..£

56+00 STATIONING

- CL - CLEARING UMITS

DRAWN:

RG

CHECKED:

GA

DATE:

5/3/13

SHEET:

6 6 OF 11

TITLE:

WATER BODY PE1<!.4ANENT TE~PORARY IMPACT IMPACT

WEilAND C 923 SF


TRANSMISSION UNE


8 TRANSMISSION POLE

56+00 STATIONING

ClEARING UMns

Cppper Jldlley Electric MCMILLEN LLC .. . . ' A Touchwn~ Enelj,'J' ""'), 1401 sHoREUNE oR. omC£: 208.M2.4214

,Coo .erJtil;e "'"11 BOISE. 10 83702 FAX: 208.M2.4216

DRAWN: SHEET:



RG

CHECKED:

GA

DATE:

5/3/13

7 7 OF 11

g' ~

E 6 ·~

1 ~

TITLE:


Sheet 8 of 45, May 3, 2013

1illml.

K'\\_ ~ ~ STRE"AM

~ IMPACT AREA

- - - lRANSIAISSION UNE


0 TRANS~IS$QM 1'0.1.!:.

'"'""= (:"t -~ iru.IU'·~I~lll' J,.U,iJll;

~ ef' ~-· ~•J P~.'II<Je

7\. CopperVolleyEtem_k MCMILLEN LLC A Tliud1..<iune F.nerg(.A-J. 1401 sHORWNE oR. oFFJCE:,20B.342.4214

C rerative -~Q'" 1 BOISE, ID 83702 FAX: 208.342.4215



DRAWN: SHEET:

RG

CHECKED:

GA

DATE:

5/3/13

8 B OF 11

TITLE:


Sheet 9 of 45, May 3, 2013



illrnll

~~STREAM tsms2S2S82I IMPACT AREA

- • - lRANSUISSION UNE

39 lRANSUJSSJOH POL£ NUMBER

0 ~..l!l!l+IWlU

DRAWN:

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CHECKED:

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DATE:

5/3/13

SHEET:

9 9 OF 11

c 0

I

TITLE:


TRANSMISSION LINE ENLARGED AREA 8 t ~ tcs~~-~~~~50~' ~~~~~~~a·~~~tt~~~w(tt/z ~



~

fS\_ WS'J STREAM

t22SM&QI I~PACT AREA

- • - TRANSMISSION L.l'lE


0 TRANSMISSION POLE

56+00 STATIONING

- CL - ClEARING UMITS

DRAWN:

RG

CHECKED:

GA

DATE:

5/3/13

SHEET:

10 10 OF 11


Sheet 11 of 45, May 3, 2013

10'-o• IV IN

TEIII'Dfl}ffl fU roo CCN;;J~LC'JION AIXOS

:!I~~L~· TRIBUTARY - TEMPORARY IM~··~::~~Csi:;;:;;.;::~t =~J~l' (])

-1-1..2.:!_ ~~~~~/RANSMISSION LINE - PERM~==-NT I~PACT :!J CD

DRAWN: S"'EET:

COPPER VALLEY ELECTRIC ASSOCIATION RG

ALLISON CREEK HYDROELECTRIC PROJECT FERC NO. 13124

TRANSMISSION LINE TYPICAL DETAILS

CHECKED:

GA

DAT::

5/3/13

1 1 11 OF 11

0 . ""'=D •· •• • _,p.P·

POA-2008-1257, Allison Creek, Hydroelectri Project Copper Valley Electric Association, Inc. Lat. 61.0555 N., Long.146.3481 W. Sheet 12 of 45, May 3, 2013


FERC NO. 13124 ·PENSTOCK JOINT APPLICATION FOR PERMITS

.JJHCTIC OCE~fll

LOCATION MAP NTS

PROJECT MAP fX\ NTS 'OJ

DIVERSION STRUCTURE: LAT: 61.065136'

LONG: -146.350213' SECTION 30, TOWNSHIP 9 SOUTH, RANGE 6 WEST

POWERHOUSE: LAT: 61.080351'

LONG: ·146.353116' SECTION 19, TOWNSHIP 9 SOUTH, RANGE 6 WEST

T.~=~~~C ~£!!LL~rnt!'2~~~ J \ Coo raril'e J\R"' BOISE. 10 BJ702 FoiX: 208,342.4216

TITLE: COPPER VALLEY ELECTRIC ASSOCIATION ALLISON CREEK HYDROELECTRIC PROJECT

FERC NO. 13124- PENSTOCK LOCATION MAP, VICINITY MAP AND PROJECT MAP

VALDEZ-CORDOVA COUNTY, ALASKA

DRAWN: SHEET:

RG

CHECKED:

GA

DATE:

5/3/13

1 1 OF 10

TITLE:


Sheet 13 of 45, May 3, 2013


FERC NO. 13124- PENSTOCK PENSTOCK KEY PLAN

- •- PENSTOCK UNE

XX+OO PENSTOCK STATION (FEET)

MCMILLEN, LLC 1-101 SHORE!JNE IJR. BOISE, ID 83702

DRAWN:

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CHECKED:

GA

DATE:

5/3/13

OFFICE! 208.342.4214 FAX: 208.342.4216

SHEET:

2 2 OF 10

. , ; ) lilT I I ·

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RXX$<$@1 IMPACT AREA

- CF - CO~STRUCTION FENCE

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- SF - SILT FENCE

II A1f.fi1ln ~ EXISTING ROCK BOULDER

L _____ l

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TITLE:

SCALE: 1"~ 80' 0c 40' eo·w ~

~c:=~u::~~C."'":~:::::-4o-::1 s:-~-::~:-NE:::::-o1-R.L-L-~-!:l-E:'-2~-s.34-~-4~-4 -1

I ,- Coo mive 1\-A"" BOISE, 10 83702 FAX: 208.342.4216


FERC NO. 13124- PENSTOCK PENSTOCK LINE ENLARGED AREA 1

DRAWN:

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CHECKED:

GA

DATE:

5/3/13

SHEET:

3 3 OF 10

TITLE:

POA-2008-1257, Allison Creek, Hydroelectri Project Copper Valley Electric Association, Inc. Lat. 61.05.55 N., Long. 146.3481 W.

Sheet 15 of 45, May 3, 2013

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- CF - CONSTRUCTION FENCE

- CL - CLEARING LIMITS

- SF - SILT FENCE

4 EXISTING ROCK BOULDER

\

DRAWN: SHEET:

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CHECKED: 4 GA

DATE:

5/3/13 4 OF 10

TITLE:


Sheet16 of 45, May 3, 2013

\ \

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\

ENERGY DISSIPAllON ROCK

\

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J.mEtill. ~ STReAM

~ IMPACT AAfA

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-~- ::~~::c:OCK BOULDER

\ PROJECT YBOUNOARY

\ \ \

PERMANENT IMPACT (CULVERT DRAINAGE BYPASS)

\

DRAWN: SHEET:

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CHECKED:

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DATE:

5/3113

5 5 OF 10

TITLE:

\

\ \ \

\ \

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POA-2008-1257, Allison Creek, Hydroelectri Project Copper Valley Electric Association, Inc.

Lat. 61.0555 N., Long. 146.3481 W. Sheet 17 of 45, May 3, 2013

\ \

~ ~STREAM ~ IMPACT AREA

- CF - CONSTRUCTioN FENCE - Cl - CLEARING llt.41TS - SF - SILT FENCE

• EXISTING ROCK BOULOER

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DATE:

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6 6 OF 10

TITLE:

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POA-2008-1257, Allison Creek, Hydroelectri Project Copper Valley Electric Association, Inc. Lat. 61.0555 N., Long.146.3481 W. Sheet 18 of 45, May 3, 2013

--f I liD/ STREAM

I CHANNEL

\ \ \

\ \ \

J.EQENQ ~STREAM ~ IMPACT AREA


- CL - CLEARING LIMITS

- SF - SILT FENCE

~ EXISTING ROCK BOULDER

YPROJECT

\ ·-\ \

\

DRAWN: SHEET:



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CHECKED:

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DATE:

5/3/13

7 7 OF 10

TITLE:


I

I

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fS0>..~ STRE:AM

R$000@ IMPACT AREA


- Cl - CLEARING LIMITS

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~PROJECT I BOUNOAR"I

--+ ~~~~,~1·~~5~0.~~====~~.-~~·~~~~ror·GD~i?~

~c::~~u:~c·-:~:=-4o-:, s:-~-::REM=-uN-:r o:-!.-L_L_E_om-~-r:,-2~-8.3-~-4~-H---1! J \" Coo rntive ~n?1 BOISE, 10 63702 FAX: 208.342.4218



DRAWN: SHEET:

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CHECKED: 8 GA

DATE:

5/3/13 8 OF 10 ~ 0:

TITLE:


Sheet 20 of 45, May 3, 2013

lliEllil. ~STREAM ~ IMPACT AREA

- SF - SILT FENCE

~ EXISTING ROCK BOULDER

PENSTOCK

I I

I

I I

I I I

I

~PROJECT I BOUNDARY

&-PERM,t.NENl IMPACT DRAINAGE ~ASS)

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I ~~~~N'(;-E: S:;-:1 !~~ofc~f.K_..:::;LI:...:.N=.E.....:E::.:.N.:..:LA:....:R:...:.G;:,;E::.:D;......:..A~~~EA~7~,.~· ~~50'0:EDtJ, ®

lJfC::~~~g~C-~-40~1 SH~~~~:--N-E _!_L_L_E_om-~-E:,-2~-8.3-~--4~-H--1 J \" OJO rative 1\.~?"1 BOISE, 10 83702 FAX: 208.342.4216



DRAWN: SHEET:

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DATE:

5/3/13

9 9 OF 10

r--------------------------

TITLE:




J.EWl!l ~"')STREAM RXXX$MOj IMPACT AREA

DRAWN: SHEET:

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DATE:

5/3/13

------------

~~~C;50KEY PLAN ,. ,~ '~ @

--.. ---

I /

/ ~-/

/ /

/ /

------~~,~-G~D PLAN AT DIVERSION AND I~TAKE " M @

MCMILLEN, LLC 1401 SHORELINE DR. BOISE. ID 8J702

OFF'!CE: 208.342.4214 FAX· 208.342.4216

POA-2008-1257, Allison Creek, Hydroelectri Project

Copper Valley Electric Association, Inc.

Lat. 61.0555 N., Long. 146.3481 W.

Sheet 22 of 45, May 3, 2013

ENLARGED PLAN AT POWERHOUSE SCALE: 1"•40'

5/3/13 I ISSUED FOR CONSTRUCTION

REV: I DATE: I DESCRIPTION:

REVISIONS

@

RLG I SS I1.4DM

S!illL.!IJl.lES 1 TOPOGRAPHIC MAPPI~G A~D CONTROL BASED ON SURVEY

PREPARED BY R&IA CONSULTA~TS DHEO OCTOBER 2012

A CONSTRUCT ~EW REINrORCED CONCRETE DIVERSTO~ STRUCTURE, OCEE CREST SPILLWAY, STILUfJG BASm, AND SLUICE WAY WITH SLUCE GATE.

9 CONSTRLICT NEW INTAKE STRUCTURE WITH TWO 8"Wx5'H TRASHRACKS, SWICINC 2'•4' GATE, FABRICATED PENSTOCK ltlTAKE, ANO ISOlATION GAT! AlONG WITH NEW COIAMUNICAnofoJS BUILDI~ 0~ I~TAKE STRUCTURE

C I~STALL NEW 40" 01A PENSTOCK WITH VENT PIPE AND ISDlAT10N SlUICE GAIT

0 CONSTRUCT NEW GRAVEL HELICOPTER lANDING PAD

E CONSTRUCT 7200 LF OF STEEL PENSTOCK RANGING IN SIZE FROM 36" OIA TO 40" OIA

F CONSTRUCT NEW POWERHOUSE APPROXI~T'ELY 55'w66' WITH NEW 6.5 IIW PELTON TURBINE/GENEAATOR, BRIDGE CRANE. BUILDINGirdEC~NICALANOELECTRICALEOUIPIAEtlT,STANDav GENERATOR AND !SOlATlO~ VA!.V(

G CONSTRUCT NEW CONCRETE TAILRACE C~NNEl

H CONSTRLICT NEW SUBST A TlON

I DEVELOP PROJECT SITE AND CONSTRUCT t-0' ACCESS RQ,f,Q

J CONSTRUCT A NEW 25W TAANSM!SSION LINE FROM ALLISON CREEK H'I'DRO SUBSTAT10N TO ~YVllLE SUBSTATlO~

K CONSTRUCT ~EW l&"xl&" TU~~EL F'OR CONSTRUCTIO~ ACCESS AND PENSTOCK.

CONTROL COORDI~A ITS (~AD83 ASP lONE J SFT)

PT NORTHI~G EASTING NAME

12 2587043.4720 1578310.2970 CP12

1J 2587003.2140

21 2579783.8699

___ Copper Valley Electric Assn. ~rA\'Mt

~~ ~ Glen~Oqie~01K 4~9588 ALLISON CREEK HYDROELECTRIC PROJECT.

FERC NO. 13124

PROJECT KEY PLAN

OWN: RLG REV:

OWN: I CKO: I APP· ,CKD· SS 0

DATE·

PROJECT DESIGN CRITERIA CRITERIA VAW£ CRITERIA VALUE CRITERIA VALUE

DRAII<W:E BASIN H"ffRRLLOO( - (0 POWERHOUSE SlRUCTVRE) POWERHOUSE TURBINE UNIT

WATERSHED AT DPIERSION STRUCTURE IPS SQUARE UILES 2-IDR NO. Of TURBINES

TOTAL WATERSHED 7.5J SOUAAE loiiLES A. DISCHARGE 294CFS TURBINE TYPE PELTON

ALLISON LAKE EU:VATION 1J60n t.ISL B. 5~ COr.ElOE:NCE NTER'IAL 156CFS UINIUUI.I Fl.OW "" H"''OROLOG"r' - (0 OIVERSION STRUCTURE) C. 95% CONFIOENCE INTERVAL 552CFS IAAXIUUt.l Fl.OW 80"' 2-'!'EAR tOO-YEAR RATING 6.51dW

A. OISCHAACE 259 CFS '""""""'' 756CFS PI.ANTFo\CTOR 0.91CV

B. 5t:. COI\IFlDENCE INTERVAL 1l7CF"S 8 5'11; COtE'IDENCE INTEI!VAL 378CFS SPEED 514 RPU

C.95!1;CON'l0ENCEINTERVAL 488 CFS C 951; COI<EDENCE INTERVAl 1510CFS STA.TIC HEAD PRESSURE sto n 100-YEAR UINIIoiUU FLOW 8T01DCFS PENSTOCK PIPEW.IE

A. OISCHAAGE 667 CFS SEE PENSTOCK SUioiW.RY TMILE ON SHEET H02-D-J1 VOOOl-RO

B. St:. C0Nf10ENCE INTERVAL JJJ CFS

C. 95!1: CON'lDENCE INTERV.t.L 1340 CFS

UINit.IUiol FLOW ""

1350

=1=-=L ·---+- 1·---+-1.350

Jill 1--- ·--· ---· ·--1--- - -· 1300 - 1.300 --I'-- ·-r- ·- - f-- -- - - ·-f-

__ _j__ ·- -- --1- _j_ l

~ 250 - 1? ... 11 "-OIII(RSION STRJXTURE

~ l I I I ~ =:::: 1200 - ~~ORW.L OPERATING

0•4 CFS; HGLI.4:~:E=B~~o~cE,r~ - 1200 INTi-E [L 1298.5 ..... ,, ........ I 1150

L-Q1VERSION ~ 0•80 CFS: fiGLw.:~~E~og:oE,::.~- - 1150

1100 STRUCTURE

1100 i 1050

\.. 1050

1000 1000 -- --1--- - ~- ·-!--- \ -- --!---·· --- 1·------ 1-- ·~

950 950 - - ·- 1-- ·-I-~- -- f--1-- 1--- ·- -

900

"" 900

c-·-- 1- . --~

- -··- ,---- 1--- 1--- --850 850

--· ........... - I· ........ .. BOO BOO

750

......... PENS-TOCK _/

....... ...

ALIGNMENT .......... 750 I I············ ................ . ..

700 ...._ rEX1ST GROUND 700

'"' ........ f-._

650

600 ...... l.r-EX1ST CROUNO

600 -- ..... 550

'.( 550

~ ..... 500 ...... 500

I 1---· 1-- -- --- f--- - 1--- -- -·-·· ~ ~ COtM:NTIONAL TU~EL ---450 450

1- ·~ r--- ~ -- ·-- --- ---- 1----- -- ··-- --~-· - -400

~ 400

1-··· -- - --- - ···- --350 350

--1--- - ·- -- ·-- -- - --1--- - 1-- ~ -- - .... - ->CD JOO

..... ...... ......... I ..... 250

" POWERHOVSE \

250 ...... ....

200

1 r- 200

'"" 150 ..... .. .... ..... ......._

~· '" 100

9-+000-+00 12-+00 14-+00 16+00 18+00 20-+00 22+00 24+00 26+00 28+00 >0+00 l2+00 l4+00 J6+00 .18+00 40+00 42+00 44-+00 46+00 48+00 50+00 52+00 54+00 56+00 58+00 60+00 62+00 64+00 615+00 68+00 70-+00 72-+00 74+00 715-+00 78+00 80+081+00

HYDRAULIC PROFILE @ BD CFS ~Vity&:flrCopper Valley Electric Assn. SCALE·NTS ~ ~ Glen~~ien~0~K 4~9588

ALLISON CREEK HYDROELECTRIC PROJECT, FERC NO. 13124

MCMILLEN, LLC POA·2008-1257, Allison Creek, Hydroelectri Project

HYDRAULIC PROFILE Copper Valley Electric Association, Inc.

Lat. 61.0555 N., Long. 146.3481 w. AND DESIGN CRITERIA

Sheet 23 of 45, May 3, 2013 OWN: RLG REV:

1401 SHORELINE DR. OFF!CE: 208.342.4214 0 5/3/13 ISSUED FOR CONSTRUCTION RLC JJS "0" 0

BOISE. ID 83702 FAX: 208.342.4216 REV: DATE: DESCRIPTION: OWN: CKD: APP:

REVISIONS DATE:

MCMILLEN, LLC 1401 SHORELINE DR. BOISE, 10 8J702

OFFICE: 208.342.4214 FAX: 208.342.4216


Copper Valley Electric Association. Inc.

Lat. 61.0555 N., Long. 146.3481 W

Sheet 24 of 45, May 3, 2013

DIVERSION AND INTAKE STRUCTURE KEY PLAN SCALE·1"•250' o· 250' @


REV: I DATE: I DESCRIPTION·

REVISIONS

RLG I SS I MDIA

~

1 CONTRACTOR SH,t.,LL Ill/STALL ALL ESC IAEASURES PRIOR TO INITIATlNG FIELD CONSTRUCTION ACTMTI[S

2. PROJECT IS COMPOSED OF THREE WJOR WORK AREAS· A. DIVERSION STRUCTURE .A.NQ INTAKE INCLUDING

CONCRETE SPILLWAY AND STlLUNC BASIN, SLUICE Cl-tANNEl, AND PENSTOCK INTAJ<(.

B. 7200 FEET OF STEEL PENSTOCK. C. POWERHOUSE AND SUBSTATION.

THE WORK SHALL BE EXECUTED WITHIN THE GUIDELINES AND SCHEDULE OUTLINED WITHIN HE CONTRACT SPECIFICATIONS

J . .I.CCESS TO TH[ PENSTOCK AND DIVERSION AND INTAKE STRUCTURE. THE CONTRACTOR SHALL DEVELOP A DETAILED 4CCESS PLAN IN ACCORDANCE WITH THE CONTRACT SPECIFICATIONS AND SUBioiiT FOR REVIEW AND APPROYAL 8V THE ENGINEER PRIOR TO INITIATl~ CONSTRUCTION ACTMTIES

4. THE PROJECT SITE HAS SENSITIVE LAND AREAS LOCATED OUTSIDE THE PROJECT CONSTRUCTION BOUNDARIES. THE CONTRACTOR SHALL WJNTAIN ALL CONSTRUCTIOI>I ACTMTIES WITHIN THE PROJECT CONSTRUCTION BOUNDARIES AND ~EET All P[R~IT CDI>IDITIONS AND DO NOT DISTURB SENSITI\IE AREAS OUTSIDE OF THE PROJECT CONSTRUCTION BOUNDARIES

I I

\_ -----

--. _ Copper Valley 1:/eclric Assn. ~Ya,Erit

~= ~' Glen~f3ie~0lK 4~9588

OWN·


DIVERSION AND INTAKE STRUCTURE KEY PLAN

REV:

OWN: I CKD: I APP: ,CKD: 0

DATE·

/

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MCMILLEN, LLC 1401 SHORELINE DR. BOISE. 10 83702

OFFICE: 208.342.4214 FAX: 208.342.4216

DIVERSION AND INTAKE STRUCTURE OVERALL PLAN SCALE:1"•20'


Copper Valley Electric Association, Inc. Lat 61.0555 N,. Long, 146.3481 W Sheet 25 of 45, May 3, 2013

(1\ ~ •Cf1f~b1

"

Copper Valley E:tecfric Assn. P.O. Box 45

Glenncllen, AK 99588

CREEK HYDROELECTRIC PROJECT, FERC NO. 13124

DIVERSION AND INTAKE STRUCTURE OVERALL PLAN

----~-

~/

MCMILLEN, LLC 1401 SHORELINE DR. OFFICE: 208.342.4214 BOISE. 10 83702 FAX: 208.342.4216

//--</ - - - -- - - ----.......1__,.,21"·-~--h·

DIVERSION AND INTAKE STRUCTURE COFFERDAM SCAL£:1"•10'



Lat 61.0555 N .. Long. 146.3481 W Sheet 26 of 45, May 3, 2013

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1.CONTRACTORSI-IA.LLINSTALLALL[$Ct.tEASURESPRIORTO INinATINC CONSTRUCTION ACTl~TIES. SEE DWC H02-D-07-V0002 FOR ESC PlAN AT DIVERSICN AND INTAKE STRUCTURE

2. SEE DWG H02-0-11-V2001 FCR STRUCTURAL KEY PLAN. J. CAlli CENTERLINE IS BASED ON THE CENTER 01' THE OCEE SPILL

CREST. THE UAIN OIV£RSION STRUCTURE EXTENDS FROU STATION 0+98 TO STATJOf.l 1+68. TH€ LEFT AND RIGHT ABUTI.1[NT CONSISTS OF CLOSURE WALL SECTIONS BETWEEN THE BOULDERS TO PROVIDE A POSITIVE: CLOSURE AND SEEPAGE BARRIER AT 11-IE NDRldAL OPERATING LEVEL

4.THECorrERDAMARRANCEt.AENTSHOI'MIStNTENDEDTDILLUSTRATE THE GENERAL APPROACH TO 11-IE COFF"ERDAIA CONSTRUCTION AND SEQUENCE. THE CONTRACTOR SHALL DEVELOP A DETAILED COFF"ERDAt.A AND DEWATERING PLAN AND SUBl.tiT TO THE ENGINEER FOR APPROVAL PRIOR TO STARTING FIELD CONSTRUCTION ACTIVITIES.

5, THE CONTRACTOR SHALL DETERldiNE THE DESIGN STREAI.t FLOW FLOOO EVENT FOR THE COFFERDAM SYSTft.l. ANY DAMAGE WHICH OCCURS TO THE CONTRACTOR'S COFFERDAM SYSTEIA DUE TO HIGH WA KR EVENTS SHALL BE BORNE BY THE CONTRACTOR.

0 SHEET KfY NOTES·

A CO"-'TRACTOR SHALL REldDVE BOULDERS AND EXISTim> CHANNEL BANK AS REQUIRED TO CONSTRUCT BYPASS CHANNEL THE BYPASS CHANNEL SHALL BE SIZED TO WlrHSTAND THE ANTICIPATED FLOWS WHICH ARE EXPECTED TO OCCUR DURING CONSTRUCTION TO PREVENT UNDERt.IINit.'G THE COFF"EROAiol S'IST[Iol. ALTERNATELY, TH£ CONTRACTOR W..Y USE PIPES TO COtNE:'Y I'LOW F"ROIA UPSTREAIA TO OOWNSTREAiol OF THE WORK AREA.

B CONSTR1JCT COFF'ERO.W SYSTEIA CONSISTING OF SUPER-SACK/RIP-RAP WALLS OR ECOLOGY BLOCK WALLS. PROVIDE llo!PERIAEABLE LINER ALONG Tl-IE OUTSIDE FACE OF THE CDFF"EROAiol TO PROVIDE A SUFFICIENT SEAL AGAINST SEEPAGE ALTERNATE CDFF'ERDAI.I SYSTEIAS SUCH AS PORTAOAt.IS t.AAY ALSO BE CONSIDERED. THE LOCATION Of n-tE COfFERDAM WITHIN THE STREAloiWIOTiiSHALLBEDETERI.ItNEDBYTHECONTRACTDRAND IS SHOWN FOR GENERAL ILLUSTRATION PURPOSES ONLY.

C CONTRACTOR SHALL DESIGN AND INSTALL A DEWATERING SYSTEt.! CAPABLE OF HANDLING ALL SEEPAGE INTO THE CONSTRUCTION WORK AREA. THE DEWATERING SYSTEiol SHALL BE CAPABLE OF WJ!oJTAINING THE GROUNDWATER LEVEL A lo!IN1t.1Uld OF 1.0 FT BELOW THE SUBGRAOE ELEVATION THROUGHOUT CONSTRUCTION IN ACCORDANCE WITH THE CONTRACT SPECIFICATIONS. THE DfSCHARGE FROt.4 THE DEWATERING SYSTEt.4 SHALL BE DISCflARGED AT AN UPLAND LOCATION FITTED WITH A FIURATION SYSTEt.l TO ALLOW REt.lOVAL OF SUSPENDED W.TERIAL PRIOR TO ENTERING AWSON CREEK.

0 DIVERSION AND INTAKE STRUCTURE OUTLINE SHOWN FOR ILLUSTRATION PURPOSES. LOCATION OF PHASE; 1 COFFERDAM ALONG THE LENGTH OF THE DWERSION STRUCTURE TO BE OETERUINEO BY THE CONTRACTOR AS PART OF THEIR PROPOSED COFFEROAI.l AND DEWATERING PLAN.

CDF"F"ERDAM SEQUENCE:

A et1!SE..J- CONSTRUCT PHASE I COfFERDAIA AND DIVERT ALLISON CREEK TO WEST BANK WHILE CONSTRUCTING Tli£ PENSTOCK, INT.&.KE, SLUICE CHANNEL. AND A PORTION OF THE DIVERSION STRUCTURE SPILLWAY

8 et:I6Sf..JI- QMRT ALLISON CREEK TO EAST BANK THROUGH THE SLUICING CHANNEL, CONSTRUCT COFF!ROAU, A~ CONSTRUCT REt.AAINING SPILLWAY AND LEFT ASVTI.IENT FACIUT1ES

Copper Valley [/ecfric Assn. P.O. 8oK 45

Glennallen, AK 99588

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Copper Valley Electric Association, !nc. Lat. 61.0555 N., Long. 146.3481 W.

Sheet 27 of 45, May 3, 2013

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1 CONTRACTOR SHALL INSTALL AU ESC lro'EASURES PRIOR TO INITIATING CONSTRUCTION ACTI\o111ES. SEE OWC H02-0-07-I/0002 !"OR ESC PLAN AT DIVERS!Qto.l AND INTAKE STRUCTURE

2 SEE OWG HD2-D-1l-V2001 fOR STRUCMAL KEY PLAN. J DAIII CENTERUNE IS BASED ON THE CENTER or THE OGEE SPILL

CREST THE WAIN DIVERSION STRUCTURE EXTENDS FROIII STA TlON 0+9B TO STATION 1+58 THE LE:rT AND RIOHT ABUTt.IENT CONSISTS or CLOSURE WALL SI:CTIONS BETWEEN THE BOULDERS TO PRO\o10E A POSITIVE CLOSURE AND SEEPAGE BARRIER AT THE NORIIIAL OPERATING LEVEL

4 THE COFITROAt.l ARRANGEt.IENT SHOWN IS INTENDED TO ILWSTRA TE THE GENERAL APPROACH TO THE COffEROAt.l CONSTRUCTION AND SEQUENCE. TH£ CONTRACTOR SHALL DEVELOP A DETAILED COfFERDAt.l AND OEWATERINC "LAN AND SUBt.IIT TO THE ENGINEER FOR APPROVAL PRIOR fO STARTING FIELD CONSTRUCTII).I ACTIVInES.

5. THE CONTRACTOR SHALL D[T[Rt.41NE THE DESICN STREAU FLOW ~LOOD EVENT fOR THE COFTERDAiol SY'iTEt.l. ANY DAUAGE 'MilCH OCCURS TO THE CONTRACTOR'S COF"fERDAt.l SYSTUI DUE TO HIOH WATER E....O.TS SHALL BE BORNE BY TH£ CCJ.ITRACTOR.

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SEAL AGAINST SEEPAGE. ALTER*.TIVE COFFEROAIII SYSTEWS SUCH AS PORTAOAt.IS W.Y ALSO BE CONS!OfRED. THE LOCATION OF THE COff£ROAt.l W!"ll-tN THE STREAW WIDTH SHALL BE DETERMINED 8'1' THE CONTRACTOR AND IS SHOWN FOR GENERAL ILLUSTRATION PURPOSES ONLY

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B CONTRACTOR SHALL DESICN AND INSTALL A DEWATERINC SYSTEI.4 CAPABLE OF HANDLING ALL SEEPAGE INTO THE CONSTRUCTION WORK AREA. THE DEWATERING SYSTEU SKALL BE CAPABLE Dr I.WNTAINI~G THE GROUNDWATER LEVEL A t.IINit.IUU Of 1.0 FT BELOW THE SUBGRAOE ELEVATION THROUGHOUT CONSTRUCTION IN ACCORDANCE WITH THE CONTRACT SPECifiCATIONS. THE DISCHARGE fROt.l THE DEWATERING SYSTE!rd SHALL BE DISCKARCED AT AN UPLAND LOCATION FlTTEO WITH A fiLTRATION sYSTEt.l TO ALLOW REt.IO'IAL OF SUSPEND£0 W.TERIAL PRIOR TO DISCHARGING BACK INfO ALUSON CREEK.

C CONTRACTOR SHALL INSTALL TEt.IPORARY BULKHEADS IN THE TRASHRACK SLOTS TO PREVEI(f WATER FR01.4 ENTERING THE PENSTOCK INfAKE CH.WBER 0\MING THE PKASE II rt.OW OIVERSI~

0 CONTRACTOR SHALL BE RESPONSIBU: FOR ALL REPAIRS REQUIRED TO ADDRESS OO.W::E TO THE NEWLY CONSTRUCTED DIVERSION STRUCTURE AND INTAKE STRUCTURE DURING HIGH FLOW CONDITIONS WHICH W.Y OCCUR OORINC THE PHASE It n.ow DIVERSION.

E CONTRACTOR SHALL PROVIDE SUFFICIENT" RIPRAP PROTECTION DOWNSTREA1.4 fROt.4 THE SLUICE CHANNEL TO PREVrNT CHANNEL AND BANK DEGRADATION DOWNSTREAJ.A fROM THE NEW STRUCTURE DURING THE PHASE I rl.OW DIVERSION.

r DIVERSION AND INfAK[ STiruCTURE OIJTUNE SHOWN FOR ILLUSTRATION PURPOSES. LOCATION Of PHASE II C0ff£ROALI ALONG THE LENGTH OF THE DIVERSION STRIJCTVRE TO BE DETERI.IINEO B'f THE CONTRACTOR AS PART Of THEIR PROPOSED COf"FEROAfol AND DEWATERING PLAN

CDf'EERDAI.l SfOIIFNCE·

A fi::I!.SE.j - CONSTRUCT PHASE I COFFEROALI ~D DIVERT ALLISON CREEK TO WEST BANK W!-ILE COWSTRUCTINC THE PENSTOCK, INfAK[, SLUICE CHANNEl, ANO A PORTION OF THE ~ON STRUCTURE SPl.LWAY.

B ~ - DIVERT ALLISON CRE[l( TO EAST BANK THROUGH ll£ SLUICING CHANNEL, CONSTRI.JCT COFTERO.W. AND CONSTRUCT REIMJNINC SPILLWAY AND LEFT ABUTIIIENf FACIUTIES

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Lat. 61.0555 N .. Long. 146.3481 W Sheet 28 of 45, May 3, 2013

APPROVED W.TERI'.L

(1\ 11~03

___ Copper Valley £/eclric Assn. ~Y&,~

~~~ ~ Glen~~len~0~K 4~9588 ALLISON CREEK HYDROELECTRIC PROJECT.

FERC NO. 13124

DIVERSION AND INTAKE STRUCTURE COFFERDAM SECTIONS AND DETAILS j

OWN RLG 1 APP: 1,m1.41 DWG. No. JREVJ 0 5/3/13 ISSUED FOR CONSTRUCTION RLG 55 "D" . I. . I H02-D-11-V0005-RO 0

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PLAN ~

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t T~OGRAPHIC !.tAPPING PREPARED BY Roll:~ CONSULTANTS, OCTOBER 2012. SEE DRAWING H02-0-1t-V0001-RA FOR SURVEY CONTROL.

2. COMPACT NA T!V( MATERIAL TO MINIMUM OF" 92~ r>RIOR TO r>LACING CONCRETE OR GRANULAR STRUCTURAL FILL

3 COI.Ir>ACT GRANULAR STRUClURAL l'lLL TO MINIMUM 95~ 4. PLACE BACKFILL IN MAXIMUM OF 8" UN-COl.lr>ACTEO OEr>TH

AND CC:t.Cr>ACT TO IAINIIAUIA 95~ DENSITY WITHIN 18" OF STRUCTURE SUBGRADE. COio!PACT BACKI'lLL TO ldiNit.IUt.l 92~ DENSITY GREATER THAN 18" BELOW STRUCTURE SUBCRADE.

5. CONTRACTOR I.IAV USE EXCAVATED t.4ATERIAL SCREENED TO 4" t.411olUS FOR BACKFILL OF EXCAVATED AREAS Ur> TO GRANULAR STRUCTURAL GRAVEL GRADE BELOW STRUCTURES.

6. CONTRACTOR SHALL REt.IOVE OR TRit.4 EXISllNG ROCK AS NECESSARY TO COUr>LET( REQUIRED EXCAVAllON

7. THE EXCAVATION PLAN SHOWN ILLUSTRATES THE GENERAL Ar>PROAo-1 TO EXCAVATING THE DIVERSION AND INTAKE STRUCTURE. 11-iE CONTRACTOR SHALL DEVELOr> AN EXCAVATION PLAN IN CON..UNCTION ..,TH A COF"FERDAt.4 AND DEWATERING PLAN ILLUSTRATING THEIR APPROACH AND SUBt.tT TO THE ENGINEER FOR APPROVAL

8. LARGE BOULDERS AND COBBLES ARE EXPECTED THROUGHOUT THE DIVERSION AND INTAKE C()t.jSTRUCllON SITE. THE CONTRACTOR SHALL REMOVE THE BOULDERS AND COBSLES AS REOUIREO TO SUPf>ORT CONSTIWCllON OF THE DIVERSION AND INTAKE STRUCTURE. CONTRACTOR SI-IALL COORf>INA TE WITH THE ENGINEER TO INSPECT AND APPROVE BOULDER REMOVAL Ur>ON REACHING THE SUBGRADE

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ELEVA llON. THE ENGINEER SHALL INSPECT ANO APPROVE THE FOUNOATlON CONDITIONS PRIOR TO THE CONTRACTOR INITIATING CONSTRUCllON OF" THE STRUCTURE.

SURVEY LOCATION INFORMAnON

::SCRIPTION NORTHit<;G "'""" [l£V

SW CORNER 2580268.79 157896J.46 1Jt6.0 INTAKE STRUClURE

SE CORNER INTAKE STRUCTURE 258026308 157903724 1316.0

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SCALE: 1"., 20'


Copper Valley Electric Association. Inc

Lat. 61.0555 N., Long. 146.3481 W.

Sheet 30 of 45, May 3, 2013 5/3/13 REV: DATE:

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2 SEE OWC H02-0-11-V'2001-RO FOR STRUCTURAL I(('!' PLAN .3 DAW C£NT£RLINE IS BASED ON THE CENTIR OF" THE OG((

SPILL CREST '"'E IAAIN DIVERSION STRUCTlJR( EXTENDS FROM SU,nON 0+98 TO STAnCill 1+68. THE LEFT AND RIGHT ABUTMENT COIIISISl'.i OF CLOSURE WALL SECnONS BETWEEN T"HE BOULDERS TO PROVIDE A POSITIVC: CLOSURE AND SEEPAGE BARRIER AT THE NORUAL OPERATING lEVEL.

-4 FOLLOIIIING CONSTRUCTION OF" THE DIVERSION STRUCTURE, REGRADE THE EX"ISTING BANK CONTOURS TO nE TO NEW SPILLWAY RETAINING WALL n1E EXPOSED SOIL SHALL BE SEEDED ~TH A NAnVE VEGETATIVE I.IIX AND COVERED IIIlTH PERUAN[NT ESC COVERAGE I.IEASURES

5. CC>t.'STRUCT A LEVEL BUtl.DlNG AND ACCESS PAD FOR COiolt.AUNICAnONS BUIL()jNC AND I.IAINT[NANCE STACINC. THE PAD SHALL BE CONSTRUCTED WITH NAnV'E FILL GRADED ON SITE TO loAEEr THE REOUIREI.I[NTS OF" THE CONTRACT SPECIF"lCAT!ONS PAD SHALL BE SlOPED TO DRAIIII AWAY FROio! THE STRUCTURE. THE EXPOSED SOIL SLOPES SHALL BE SEEDED AND PERI.IANENT ESC MEASURE IIIISTALLEO

5 CONTRACTOR SHALL 1.4AINTAIN THE EXISnNC BOULDERS ON BOTH ABUTI.AEN"IS. Flt<IAL GRADING FILL SHALL nE INTO THE EXISnNC BOULDERS.

7 DEPTH OF CLOSURE WALL I.IAY BE FIELD AO..USrEO BY THE ENGINEER IF BELOW CRACE DBSTRUCnOHS ARE ENCOUNrEREO

8. PLACE LARGE BOULDERS IN TAilRACE CHANNEL 00WNSTREA1.4 OF SnLUNC BASIN BOULDER SIZE. NUI.IaER AND LOCATION TO BE DETERI.IINEO BY ENGINEER

SITE COORDINATES

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WALL

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~r.t,-f«tt Copper Valley £/ectric Assn,

I\ u;;;;;: ~ Glen~~len~0AK 4~9588 ALLISON CREEK HYDROELECTRIC PROJECT.

FERC NO. 13124

DIVERSION AND INTAKE STRUCTURE GRADING PLAN

OWN: RLG REV:

0 DESCRIPTION: OWN: I CKO: I APP: ,CKD·

REVISIONS DATE

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1 EXCAVATION SlOPES W..Y BE UOOinED 8-'SED ON SOIL AND GROUNDWATER CONDITIONS E~OUNTERED IN THE FIELD AND REVIEW BY ENGINEER

2. THE EXCAVATION PlAN SHOWN ILLUSTR.4.T(S THE GENERAL APPRCM.CH TO EXCAVATING THE DIVERSION AND INTAKE STRUCTURE TI-lE CONTRACTOR SI-IAll DEVELOP AN EXCAVATIO"" PLAN IN CONJUNCTION WfTH A COFFERDAIA AND DEWATERING PLAN ILLUSTRATING THEIR APPRO.&.CH AND SUBlo!IT TO THE ENGINEER FOR APPROVAL

J. LARGE BOULDERS AND COBBLES ARE EXPECTED THROUGHOUT THE DIVERSION AND INTAKE CONSTRUCTION SITE. THE CONTRACTOR SHALL REt.10VE THE BOULDERS AND COBBLES AS REQUIRED TO SUPPORT CONSTRUCTION OF THE DIVERSION AND INTAKE STRUCTURE. CONTRACTOR SHALL COORDINATE WITH THE ENGINEER TO INSPECT "NO APPROVE BOULDER RD.10VAL UPON REACHING THE SUBCRAD€ ELEVATION, THE ENGINEER SHALL INSPECT AND APPROVE THE FOUNMTION CQt.IDITlONS PRIC* TO THE CONTRACTOR INITIATING CONSTRUCOON OF THE STRUCTURE

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:m:brt- P.O. Box 45 SECTION fB\ .,I~.Mt~' Glennallen, AK 99588

SC<LE• ,._ s· o· '" ''~06 ALLISON CREEK HYDROELECTRIC PROJECT.

POA-2008-1257, Allison Creek. Hydroelectri Project Copper Valley Electric Association, Inc.

Lat. 61.0555 N., Long. 146.3481 W. Sheet 31 of 45, May 3, 2013 5/J/13 J ISSUED FOR CONSTRUCTION

REV: J DATE: J DESCRIPTION:

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CONCRElE WALL t.IAY BE CAST DIRECTLY AGAINST ROCK J. EXCAVATE FOR CONCRETE AND SHEEWILE WAU

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Lat. 61.0555 N., Long. 146.3481 W.

Sheet 34 of 45, May 3, 2013

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MCMILLEN, LLC 1401 SHORELINE DR. OFFICE: 208.342.4214 BOISE. ID 83702 FAX: 208.342.4216

NELSON STUDS 0 6" OC 1YPEASIDEPROVIDE•h6

REDWOOD Tot(; STOPLOGS

~~~~~~~~~ EW,

1294.00

___ Copper Valley Electric Assn. ~VM(Ekl!i

_;_n~ , P.O. So)( 45 SECTION EL 12B5.0 ··~.Me~ Glennollen, AK 99588

SCALE, '/4"• r-o· o· ALLISON CREEK HYDROELECTRIC PROJECT,

POA-2008-1257, Allison Creek., Hydroelectri Project Copper Valley Electric Association, Inc.

Lat. 61.0555 N., Long. 146.3481 W. Sheet 36 of 45, May 3, 2013 5/3/13 I ISSUED FOR CONSTRUCTION

REV: I DATE· I DESCRIPTION: REVISIONS

OWN· RLG I ~E I 1.101.1

OWN: I CKD: I APP: ,CKD· DATE

FERC NO. 13124

DIVERSION AND INTAKE STRUCTURE SECTIONS 1

REV:

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,5 •• cru~. 9· ~ ~

it,.,,., n i=r 11 ·, 1 \> : , , ;. 1

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SECTION SCALE: 1/<4"• 1'-0"

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..

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SECTION f'B"\ ABUTMENT WALL INTERSECTION DETAIL - PLAN f1\ :=~ot. Gloo~$;.~'~K•~9588 SCALE= J/'-"· ,·-o·

11§0

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MCMILLEN, LLC 1401 SHORELINE DR. BOISE, ID 83702

OFF"ICE: 208.342.4214 FAX: 208.342.4216

POA-2008-1257, Allison Creek, Hydroelectri Project Copper Valley Electric Association, Inc

Lat. 61.0555 N., Long. 146.3481 W.

Sheet 37 of 45, May 3, 2013

..-.. FERC NO. 13124


REV: DATE: I DESCRIPTION:

REVISIONS

OWN· RLG I ME I 1.101.1

OWN: I Qg)_:_l_ APP: ~ DATE:


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MCMILLEN, LLC 1401 SHOR£UNE DR. OFFICE: 208.342.4214 BOISE, ID 83702 FAX: 208.342.4216


Copper Valley Electric Association, Inc

Lat. 61.0555 N .. Long. 146.3481 w Sheet 38 of45, May3, 2013

SECTION 1@01 SCI.LE: 1/4"- 1'-o·


REV: I DATE: I DESCRIPTION·

REVISIONS

--. _ Copper Valley £/ectric Assn. ~Y~E.irhl

OWN· RLG I ME I MDIII

OWN: [ CKD: [ APP: ~ DATE·

~= q_. Glen~~ien~0AK 4~9588 ALLISON CREEK HYDROELECTRIC PROJECT,

FERC NO. 13124


REV:

0

'M'E Cf' llolPORTEO BEDDING loiTL (COioiPACT fO 92'% !oliN

OF loiODiflED PROCTOR)

PENSTOCK TRENCH SECTION (NATIVE MTL PIPE ZONE BACKFILL) OPTION 1

N.Q!ES.;_

FLEXIBLE PIPE REFERS TO ALL STEEL, DUCTILE-IRON, AND PlASTlC PIPES T'tPICAL TRENCH SECTIONS -'RE TO BE USED ONLY WHERf STABLE. COUPACT SOIL CONOmONS EXIST. IF BOULDERS OR t..ARCE OBSTRUCTIONS ARE ENCOU/ffl:RED, TRENCH SECTIONS I.AAY BE DEEPER OR WIDER THAN SHOWN. Tt-«: ENGINEER SHALL BE AIMSED SHOULD THIS OCCUR.

J THE NEED FOR PROTECTWE SYSTEiriS A.l() EXCAVATlON SlOPES SHALL B( DETERWINED Er'l' CONTRACTOR CQt.ISUR1NC APPl.ICABLE LOCAL, STATE AND f'£DERAI. (OSHA) SAFElY STANDARDS AND REGUlATIONS, AND GEOTECHNICAL CONSULTANTS' RECOW1o4ENOATIONS. PROTECTM: S't'STEioiS SI-W..l BE DESIGNED AND BUILT IN ACCORCWoiCE WITH THE APPLICABLE LOCAL, STATE AND F'EDEIW. (OSHA) SAFElY STANDARDS AND REGULATIONS

4. CONTRACTOR SHALL SUBWIT SUPPORTING OOCUioiENTATION R[CAROitoiG PIPE TRENCH DESIGN AND COioiPLIANCE WITH APPUCA9LE LOCAL. STATE AND FEDERAL (OSHA) SAF'El'1' STANDARDS.

5 UNSUP?ORTED VERTICAL AIIID/OR SLOPING TRENCH WALL SlOPES SHALL NOT B'E STEEPER THAN ALLOWED BY APPLICABLE LOCAL, STATE AND FEDERAL (OSHA) SAfUY STANMROS AND Flt:CUI..ATIONS, UNLESS SUPPORTING DOCUioiENTATIOIII IS SUBioiiTTED, ACCORDING TO AF'OREioiENTIONED SAF'ElY STANOAAOS.

6. NA.TM: i.AATERIAL SCREENED TO 5"• loiiNUS. C~PACT IN W.X 12" TALL LIFTS TO loiiN 85% OF IAOOIFlED PROCTOR. FlNISH BACKI"'U BY WOUNDING i.AATERIAL APPRDX 6" TO 12" ASM NATURAL EXISTING GRADES.

7 TRENCH SECTIONS OTHER THAN THE 'M'ICAL SECTIONS SHOWN I.AAY BE UTILIZED PROVIDED THEY COWPLY WITH APPLICABLE LOCAL, STATE AND FEDERAL (OSHA) SAFETY STANDARDS AND REGUlATIONS. DOCUWENTATION SUPPORTING THIS COI.IPLJ,I.IIICE SHALL BE SUBiollm:D TO THE ENGINEER FOR APPROVAL

8 IF OURINC CONSTRUCTION, THE WATER TABLE IS DISCOVERED TO B£ ABOVE THE TRENCH BOTTOU, THE ENGINEER SHALL BE NOT'f'IED, AND APPROPRIATE DEWATERING SHALL BE lloiPlEioiENTEO TO LOWER Tf£ WATER LEVEL B£LOW THE TRENCH BOTTOW THE BACKFllL ~TERIAL SHALL 8£ ACCORON:; TO THE E:AAT...WORI< SECTIONS OF' THE SPEC1FlCAT10111S, OR .1.5 ORDERED BY THE ENGINEER.

9 SEE PART J.BK OF' 'XCTlON Jl 00 00 - EARTHWORK FOR PIPE ZONE AND TRENCH ZONE EXCAVATION AND COWPACTION REOUIREioiENTS

t

EXIST GR.~,[)I:. _ - - - - - JP~R t .\....!,,SEE NOTE 5 I - -

;.-:. .:~0 ~ ~H-1 ;-_~ .:~0 •CLEARANCE WIDTH B[lW[EN SPRING LINE AND TRENCH WAU I.AAY BE !.lORE AS NEEDED AT JOINTS WHERE WELDING AS REQ'D

PENSTOCK TRENCH SECTION (CLSM PIPE ZONE BACKFILL) OPTION 2

~~~~~~ ~R:_NCH SECTION FLEXIBLE PIPE 8

Lf I, I I

I, It...-...-

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~,.: :." ~·"':.~ "-., ~f"'- TYPE Cf' IUPORTEO BEDDING lolTL (COI.IPACT TO 92X loiiN OF lolOOIFlED PROCTOR)

PENSTOCK TRENCH SECTION (FO_R -~ENSTOCK INSTALLED ON SIDE HILL AND BELOW TEMP ACCESS ROAD) ~

MCMILLEN, LLC 1401 SHORELINE DR. BOISE, 10 BJ702

OFFICE: 208.342.4214 FAX: 208.342.4216

POA·2008-1257, Allison Creek, Hydroelectri Project


Lat. 61.0555 N .. Long. 146.3481 W. Sheet 39 of 45, May 3, 2013

--------

(USE WHERE EXISTING GROUND IS LESS THAN J FEET ABM TOP OF PENSTOCK)

PENSTOCK TRENCH SECTION (FOR PENSTOCK INSTALLED IN SHALLOW BURIAL AREAS) 8 c:rAt ~· , 1.,. _ , • ,. C605


REV: I DATE: I DESCRIPTION:

REVISIONS

•CLEARANCEWIOTHBETWEENSPRINGLIIIIE -'NO TRENCH WALL I.AAY BE !.lORE AS NEEDED AT JOINTS WHERE WELDING IS P£RFORI.IEO

PENSTOCK TRENCH SECTION (FOR SLOPES GREATER THAN 55%) 8 ~m =

RLG

OWN:

~r.lyltittCopper Volley [/ecfric Assn.

I\~~~ Glen~~ie~01K 4~9588 ALLISON CREEK HYDROELECTRIC PROJECT,

FERC NO. 13124

PENSTOCK TRENCH SECTIONS AND DETAILS

REV:

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--·---~~~

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SCALE: NTS SCALE 1"= 5' HORIZ

1"•5'\/'ERT

MCMILLEN, LLC POA-2006-1257, Allison Creek, Hydroelectri Project


Lat. 61.0555 N., Long. 146.3481 W.

(1\ v

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/

___ Copper Valley [/ecfric Assn. ~rarEttt

~~~~' Glen~~ie~0AK4~958B ALLISON CREEK HYDROELECTRIC PROJECT,

FERC NO. 13124

PENSTOCK STREAM CHANNEL SECTIONS

lJWU. NO.

1401 SHORELINE DR. BOISE. 10 8J702

OFFICE: 208.342.4214 FAX: 208.342.4216

Sheet 40 of 45, May 3, 2013 5/3/13 ISSUED FOR CONSTRUCTION H02-D-OO-V0001-RO ! R~V:

REV: DATE: DESCRIPTION:

REVISIONS DATE·

\ (_

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POWERHOUSE TAILRACE EXCAVATION PLAN 1

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SCof.L(.l"= 10'

MCMILLEN, LLC 1401 SHORELINE OR. BOISE. 10 83702

OffiCE: 208.342.4214 FAX: 208.342.4216


Copper Valley Electric Association, Inc

Lat. 61.0555 N., Long. 146.3481 W.

Sheet 41 of 45, May 3, 2013

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1. TOPOGRAPHIC IAAPPING PREPARED BY R&IA CONSULTANTS. OCTOBER 2012. SEE ORA.WING H02-D-11-V0001-RA. FOR SURVEY CONTROL

2. COI.IPACT NA TI'IE lolA ITRIAL TO lo'IINII.IUI.I Of' 92" PRIOR TO PLACING GRANULAR STRUCTURAL FILL

J COIAPACT GRANULAR STRUCTURAL Flll TO lollNIUUioll 9~~ 4. PLACE BACKFILL IN I.IAlCII.IUI.I Of" 8" UN-COIAPACTED DEPTH

ANO COIAPACT TO I.IINIUU\ol 95" OENSITY WITHIN 18" Of" STRUCTUR'E SUBGRADE. COI.IPACT BACKFlLL TO I.IINIUUU 92% DENSITY GREATER THAN 18" BELOW STRUCTURE SUBGRADE.

5. CONTRACTOR I.IAY USE EXCAVAT£0 UAlERIAL SCREENED TO 4" !.liNUS FOR BACKF'lll Of EXCAVATED AREAS UP TO GRANULAR STRUCTURAL GRA\IEL GRADE BELOW

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ro 20 O ~~r'!.... Glennallen, AK 99588


REV: DATE· DESCRIPTION:

REVISIONS

ALLISON CREEK HYDROELECTRIC PROJECT. FERC NO. 13124

POWERHOUSE COFFERDAM PLAN

OWN: RLG RLG I SS I MD~

OWN: I CKD: I APP: ,CKD: DATE

(L_____,L/ A I ~

ECOLOGY BLOCK SCALE:NTS

MCMILLEN, LLC 1401 SHORELINE DR. BOISE. 10 83702

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Lat. 61.0555 N., Long. 146.3481 W.

Sheet 43 of 45, May 3, 2013

COWTRACTOR IliA'!' PROPOSE ALTE~TE WETHOO FOR APPROVAL BY THE ENGINEER.

!2\ 42~03

,..lilflitt Copper Valley Electric Assn.

/\ ~'f~ ~ Glen~61ie~0lK 4~9sae ALLISON CREEK HYDROELECTRIC PROJECT,

~ FERC NO. 13124

~ POWERHOUSE COFFERDAM ·... SECTIONS AND DETAILS I ~ ...,.... OWN· RLG I APP: 1.101.11 DWG. No. REV: j o o;o;, ~ow ~ <>•••- "' " •• . ' 1 H02-D-42-V0004-RO I 0 I

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CULVERT SECTION SCALE. 1/4"• 1'-0"

ROAD SECTION SCAlE 1/4"•1'-0"

TEMPORARY WETLAND ACCESS ROAD SCALE· 1/4",. 1'-0"


OFFICE: 208.342.4214 FAX: 208.342.4216



Lat. 61.0555 N., Long. 146.3481 W.

Sheet44 of45, May 3, 2013

ACCESS R<:W>

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REV: DATE· DESCRIPTION:

REVISIONS

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FERC NO. 13124

TRANSMISSION LINE TEMPORARY STREAM CROSSING AND WETLAND ACCESS

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ALLISON CREEK HYDROELECTRIC PROJECT, FERC NO, 13124

MCMILLEN, LLC 1401 SHORELINE DR. BOISE. ID 83702

OFFICE: 208.342.4214 FAX: 208.342.4216



REV:


DATE: I DESCRIPTION: REVISIONS

RLG

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POWERHOUSE TAILRACE CHANNEL PLAN AND SECTIONS

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Allison Creek Hydroelectric Project Supplemental Permit Application Information

Applicant Proposed Mitigation Statement

Copper Valley Electric Association, Inc. (CVEA) is a rural electric cooperative serving Valdez, Glennallen, and the Copper Valley basin. The objective for pursuing the potential development of Allison Creek is to displace fossil fuel generation with additional hydropower generation. CVEA operates an isolated electric system, and the only other electric energy alternative available is from CVEA's existing Solomon Gulch Hydroelectric Project or diesel. Typically, the 12-MW Solomon Gulch project provides about 50% of CVEA's generation. The remaining 50% is generated with fossil fuel from a cogeneration facility or diesel plants in Glennallen and Valdez. The 6.5-MW Allison Creek Project could off-set 11% of generation needed from diesel.

I. Avoidance of Impacts to Waters of the U.S., Including Wetlands The diversion structure, penstock and powerhouse have been designed to avoid wetlands and streams and remain cost beneficial to the project to the greatest extent practical. The design engineer concluded that there are no other practicable alternatives or arrangements available that have less impact on wetlands and streams. Due to the steep nature of the penstock alignment, there were limited options for the alignment of the penstock and access for construction.

In order to access the intake/diversion location, a temporary construction access is required to accommodate heavy machinery. The design engineer selected a tunnel alternative through the steep bedrock hillside (between stations 65+00 and 76+00) rather than cutting an access road into the hillside. By using the tunnel, potential impacts to streams and wetlands from the construction and constant maintenance of the switchback road are eliminated. The tunnel provides for access during construction and for project maintenance and inspection while also accommodating the penstock which is routed through the tunnel.

The transmission line route was selected to reduce visual impacts to area recreationalists, limit impacts to birds traversing between upland nesting areas and the shoreline, utilize a state-designated utility corridor, and avoid the Trans-Alaska Pipeline that is buried in the vicinity ofthe transmission line route. Once the general route was selected, the pole locations were established in coordination with the transmission design engineer who modified pole locations and spacing to limit impacts by selecting locations that were outside of wetlands and streams to the greatest extent practicable. This re-route helped to avoid and minimize impacts to wetlands and streams along the alignment as is presented in the permit application.

II. Minimization of Unavoidable Impacts to Waters of the U.S., Including Wetlands CVEA believes the Allison Creek Hydroelectric Project, as designed, includes all practicable measures to

minimize harm to wetlands. Six wetland avoidance and minimization procedures are incorporated in the

project design and construction:

• Project design has minimized the fill footprint to the extent practicable in order to construct components of the project,

Allison Creek Hydroelectric Project FERC License No. 13124 I POA 2008-1257

"Applicant Proposed Mitigation Statement" Copper Valley Electric Association, Inc.

June 28, 2013

Page 1

r----------------

Copper Valley Electric Cooperative, Inc. Supplemental Permit Application Information

• Facilities would be consolidated to the smallest extent practical and still provide the intended function and purpose,

• Slopes subject to erosion and disturbed surfaces would be stabilized using Best Management Practices and re-vegetated to minimize stormwater pollution,

• Sedimentation prevention measures would be placed and maintained along the toe of all fill areas adjacent to wetlands or streams to prevent the introduction of sediments. These measures would remain in place until the fill and exposed earthwork are stabilized and revegetated,

• Only clean sand and gravel would be used for fills, and

• Material would be stockpiled primarily in developed areas and/or uplands outside of wetlands or streams.

III. Compensation for Unavoidable Impacts to Waters of the U.S., Including Wetlands CVEA has designed and licensed a project that not only minimizes potential impacts to waters of the U.S., including wetlands, but also displaces fossil fuel generation with clean, renewable, hydropower generation. For the reasons presented in this Applicant Proposed Mitigation Statement, CVEA is not proposing any compensatory mitigation for project impacts (permanent 0.74 acres/temporary 0.58 acres) to wetlands and

streams.

IV. Alternatives Considered As part of the Federal Energy Regulatory Commission (FERC) licensing process and in accordance with the FERC's National Environmental Protection Act (NEPA) requirements, CVEA developed and considered reasonable alternatives in the siting, layout and design of the hydropower project. The selected run-of-river design alternative is described in the accompanying permit application.

Engineering Alternatives CVEA considered a total of six alternatives and each of these envisioned the use of Allison Lake as a storage reservoir to achieve a better balance of energy availability during the winter season. The consideration of

these alternatives is documented in CVEA's Application for Original License (August 2011) and two related technical reports contained therein: the Allison Lake Hydroelectric Project Final Feasibility Report (May 2010) and Addendum (January 2011). The six alternatives are summarized below.

• Alternative I: This alternative would have included the creation of an earth embankment at the outlet of Allison Creek to store water, an intake and a diversion tunnel to convey water from Allison Lake to the Solomon Gulch Reservoir to enhance generation at the existing Solomon Gulch powerhouse during low lake conditions. Alternative I was removed from further study due to high cost of the proposed tunnel and uncertainty regarding pathogens transferred to Solomon Gulch

Reservoir from Allison Lake and the potential cost of treatment to continue to provide water to the Solomon Gulch Hatchery.

• Alternative 2: This alternative would have included an independent development of Allison Lake

consisting of an earth embankment at the outlet of Allison Creek to store water, an intake, tunnel,

power conduit, and a new powerhouse near tidewater on Allison Creek. Alternative 2 was removed from further study due to high cost of the proposed tunnel.

• Alternative 3: This alternative was considered to convey water to an independent 4 MW

powerhouse near tidewater on Allison Creek by means of an earth embankment at the outlet of


"Applicant Proposed Mitigation Statement"

Copper Valley Electric Association, Inc. June 26, 2013

Page 2


Allison Creek to store water, a surface/buried penstock. Four configurations within this alternative were investigated:

o Alternative 3a- siphon, submerged intake and 2,200 foot long buried penstock. o Alternative 3b - a 3,000 foot long micro-tunnel with submerged intake and 30-foot high

rock fill dam.

o Alternative 3c- a 70-ft high rock fill dam at the outlet of Allison Lake and 2,200 foot long buried penstock.

o Alternative 3d- a 30-foot high rock fill dam at the outlet of Allison Lake and 2,200 foot long buried penstock with a 6 MW powerhouse.

Of the four arrangements for Alternative 3, CVEA initially concluded that Alternative 3c provided the lowest cost of power. However, by 2010 all Alternative 3 considerations, including Alternative 3c were removed from further consideration due to concerns regarding embankment cost, high potential for cost overruns during construction, foundation conditions for the embankment dam with regard to seepage and liquefaction, avalanche hazard, and project reliability during winter season due to a lack of access capability to major features at Allison Lake.

Project studies and analyses, as presented in the Final Feasibility Study Report (2010) and Addendum (20 11 ), demonstrated that each of the alternatives were technically and environmentally feasible. However, the studies also revealed that each alternative included significant challenges potentially affecting long term economics and/or operational reliability. Based on design and economic considerations and findings, CVEA removed the reservoir storage alternatives from further consideration and adopted the run-of-river hydroelectric generation project utilizing a diversion structure and intake in Allison Creek, instead of an embankment and intake at Allison Lake. This run-of-river arrangement as described in the permit application was determined to be the preferred alternative to develop the hydropower potential of the Allison Creek drainage basin. It also proved to have least amount of environmental impacts to the environment and water resources since a large dam and reservoir would not be constructed.

Environmental Alternatives

Upon selection of the run-of-river configuration for the proposed project, CVEA initiated a rigorous study program to assess environmental impacts. The resulting Application for Original License (August 2011) details the results of those studies and the additional environmental protection, mitigation and enhancement (PM&E) measures CVEA proposed to accompany the design of the hydroelectric project.

FERC's NEPA process evaluated the run-of-river project and proposed PM&E measures. The Final

Environmental Assessment (EA) was issued by FERC on June 21,2013 presenting FERC's environmental

analysis of the alternatives considered: the applicant-proposed alternative, the staff-recommended alternative, and the no-action alternative. These alternatives are summarized below and presented in greater detail in the June 2013 Final EA.

• No Action Alternative: The no-action alternative is license denial. Under the no-action alternative,

the project would not be built and environmental resources in the project area would not be affected. Economic and environmental benefits associated with the reduction of fossil generation would not

be realized. Environmental consequences would include continuing use of diesel fuel to provide

Allison Creek Hydroelectric Project

FERC License No. I 3124 I POA 2008-1257 "Applicant Proposed Mitigation Statement" Copper Valley Electric Association, Inc.

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an equal amount of electric power to CVEA's members with the ensuing environmental impacts associated with storage and handling of liquid fuel; contribution to climate change due to greenhouse gas emissions and related adverse effects on public health; and contribution to ocean acidification. Continued use of diesel generation also includes increased future energy generation costs asso_ciated with direct costs of monitoring and compliance, the fluctuation in the cost of diesel fuel, and indirect costs to public health.

• Applicant-Proposed Alternative: CVEA proposed the Allison Creek Hydroelectric Project as described in the permit application accompanied by a number of measures to minimize potential impacts on the aquatic ecosystem, including:

o Operate the project in run-of-river mode o Release a minimum flow of2 cubic feet per second (cfs) at the diversion structure into the

bypassed reach of Allison Creek at all times when the project is operating o Maintain a minimum flow of 1 0 cfs in Reach 3 of the bypassed reach ( 6,500 feet

downstream from the diversion) from June 16 through October 31, and 8 cfs from November 1 through June 15 if the project is operating

o Provide a ramping rate of20 cfs per hour in Reach 3 during project startup and shutdown o Minimize the footprint of the area to be used to place fill material o Consolidate project facilities to a small area of impact o Implement an Erosion and Sediment Control Plan (ESCP) to protect water quality by using

best management practices (BMPs) for controlling erosion; and develop and include in the ESCP: a Storm Water Pollution Prevention Plan, a Construction Water Quality Monitoring Plan, and a Blasting Plan

o Develop and implement Phase 1 of a Biotic Monitoring Plan that includes an Environmental Compliance Monitoring Plan (Environmental Monitoring Plan) and provides for the presence of a qualified Environmental Compliance Monitor (ECM) onsite during all construction phases to monitor turbidity upstream and downstream of the construction during instream work

o Implement measures to protect wetlands including: revegetating slopes and disturbed surfaces to minimize stormwater pollution, planning and maintaining sediment prevention measures along the toe of all fill areas adjacent to wetlands or waters, preventing sediments from entering fill areas adjacent to wetlands or waters, using only clean sand and gravel for fill, and stockpiling material in developed areas and/or uplands (see also Section II above)

o Install and maintain stream gages below the diversion and in Reach 3, and collect and analyze data from these gages to document compliance with minimum flow releases

o Develop and implement Phase 2 of the Biotic Monitoring Plan to monitor water temperature alterations, fish stranding, and habitat connectivity in the bypassed reach of

Allison Creek

• Staff-Recommended Alternative: Under the staff alternative, the project would include Copper Valley's proposed measures, as outlined above. In addition, staff recommends the following

modifications and additional measures to minimize potential impacts on the aquatic ecosystem: o Develop an Operation Compliance Monitoring Plan



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o Provide failsafe provisions to ensure that continuous instream flows are provided to Allison Creek in the bypassed reach

o Develop a final tailrace design in consultation with the agencies to reduce or eliminate fish attraction to the project tailrace

o NotifY the Commission, ADFG, and FWS within 10 days of an event not in compliance with any license that may be issued that would affect fish and/or wildlife

o Develop a plan to discourage fishing, hunting, and trapping in the project area by project personnel

Allison Creek Hydroelectric Project FERC License No. 13I24 I POA 2008-1257


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Documents

COPPER VALLEY ELECTRIC ASSOCIATION ALLISON ......POA-2008-1257, Allison Creek, Hydroelectri Project Copper Valley Electric Association, Inc. Lat. 61.0555 N., Long. 146.3481 W. Sheet