Electrical Power for Valdez and the Copper River Basin-1981

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2. Biologicala. Vegetation:,r-.Hydroelectric: No direct vegetative impacts would be associated withthe underground penstock, however, the tailings from the tunnel would berenwved from the portal and dumped into a canyon located to the east.The material would De dumped over a near vertical cliff and cover an areaof a dense alder stand with devils Club, red elderberry and salnlonberryunderstory at the bottom of the canyon. Revegetation of the impactedarea witn simi lar species proDably WOuld not occur for nlany years due tothe different nature of the tunnel material and the existing disposalsite material. Alternative methOdS and sites for tailings disposal havebeen eliminated mainly because of physical constraints. Roadconstruction to the tunnel portal would require consideraole excavationinto the mountain side which would cause esthetic degradation and greatlyincrease the possibilities of erosion. No alternative sites are near thetunnel portal with gradual slopes that could contain the tailings. Theproposed disposal site does not drain into either Allison Creek orSolomon Creek and any increased sedimentation would not affect anadromousfish.The above-ground penstock would require a 2,8S0-foot right-of-wayapproximately 10 feet wide. The lower portion of the proposed right-ofwayconsists of a dense alder thicket while the upper portion of theright-of-way is either unvegetated or consists of alpine tundra. Alllarge bushes and snrubs would be removed, with the low ground coverremalnlng. Sixteen concrete anchor blocks and 190 concrete support piersWould be utilized to support the penstock above ground. In these areasall vegetation would be cleared. In the exposed areas where thevegetative cover would be removed, revegetation with suitable specieswould occur upon project completion.The transmission line would impact tne Sitka spruce/mountain hemlockforest located along the 3.S-mile long, 50-foot wide corridor. Theentire line would require essentially continuous clearing regardless ofthe exact alignment. Small shrubs and bushes would remain and all othermaterials would be burned, chipped, or left in place as determined by theU.S. Forest Service which is the administrator of the land. The terrainexclUdes establiShing the transmission line next to tne Dayville Road(refer to Photo on page ii of the Feasibility Report and thetopographical map. Plate D-A-3 in Appendix D). Although the Trans-AlaskdPipeline Corridor has been clearcut, Alyeska Pipeline Service isreluctant to allow any construction tnat would hinder their access alongthe corridor. The tentative route would De as near the Dayville Road aspossible.The powerhouse would only occupy an area large enough to house the twoturbines. The proposed powerhouse site is in an area co~ered mainly withalder with a portion of the site having been previously cleared. Aproposed mitigative tailrace leading to Port Valdez would cross an areawhich has been cleared and covered with gravel and supports littlevegetation.E I S- 11
Some impacts would occur to the intertidal algal vegetation in the areadesignated for tne riprap. Tne riprap would cover fairly dense growthsof rockweed (Fucus disticus) and encrusting algae. Colonization of theriprap material would occur, probably to a lesser extent than prior todisposal, because of the freshwater introduction and the force of thefalling water.Pressure Reducing Turbine: Tne site for the PRT structure is locate~on the Trans-Alaska pipeline corridor. The pad and road are alreadyexisting and little vegetative alteration would occur. The exactlocation of the transmission line has not been determined at this time.If it is allowed to follow the existing oil pipeline route, littlevegetation impact would occur. Any other route would impact a 50-footwide corridor for the length of the transmission line.b. Wildlife:General:projects andconaucted totransmissionAct of 1940.Prior to construction of either the hydroelectric or PRTtheir transmission line corridors, a survey would beascertain the exact locations of eagle nests. Theline corridors would be routed to comply with the Bald EagleHydroelectric: Tne transmission corridor would cnange approximately24 acres of mature Sitka spruce/mountain hemlock forest, located betweentne Dayville Road and the AlyesKa oil pipeline, to a small brush anashrub habitat. Utilization of the proposed transmission right-of-way bylarge mammals is low partially because the surrounding area has moderatehuman activity to act as a deterrent to migratory or resident mammals.The construction and maintenance of the transmission line corridor wouldincrease the influence of man's disturbance forcing the animals farthersouth.The proposed construction of the project would have varying effectsduring different phases of construction. Blasting and drilling of thepenstock tllnel could cause mountain goats and other highly mObileanima1s to evacuate the area temporarily. Winter construction coulddisturb the resident black bear causing them to locate alternate dens.Bear-human conflicts could increase especially if stringent regulationsconcerning feeding or harassing of bears are not enforced.Pressure Reducing Turbine: Bear have been observed along the LoweRiver in the area of the PRT site. The construction of the PRT facilityand transmission route may cause alterations in their movement to theLowe River during salmon spawning. Operation and maintenance of thefacility may also impede bear movement. This impact appears to beunavoidable and its significance is unKnown.c. Birds:Hydroelectric: Waterfowl utilizing the lake for resting and feedingwould probably not be affected except during the construction phase.EIS-12
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E---~for-~-~and the Copper River B-
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SYLLABUSThe geographic area conside
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SOUTHCENTRAL RAILBELT AREA. ALASKAI
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INTRODUCTIONDue to continued growth
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The city of Valdez conducted enviro
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FIGURE I:HYDROPOWER STUDY AREAFOR V
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oard feet of hardwoods, half of whi
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VALDEZ
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ALYESKA PIPELINE TERMINAL
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Other Activities:Nonseasonal stable
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Table 3Historical Population of Val
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Transportation and Tourism:Detailed
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The following tables show the futur
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framework of the study authority an
Page 30 and 31: Nucl ear:Nuclear energy development
Page 32 and 33: lntertie:With the deciSlon by the C
Page 34 and 35: If the powerhouse were moved to jus
Page 36 and 37: CONSERVATION:Description:THE NONSTR
Page 38 and 39: TRANSMISSION INTERTIEDescription_:T
Page 40 and 41: impaired. As a result, standoy gene
Page 42 and 43: ALLISON LAKE
Page 44 and 45: From the time of pO\'Ier-on-line, o
Page 46 and 47: Technical services such as electron
Page 48 and 49: 175150FIGURE: 2ENERGY DEMAND - REVI
Page 50 and 51: 175150FIGURE: 4ENERGY - REVISED APA
Page 52 and 53: SYSTEMOF ACCOUNTSAccountsPlan AAll
Page 54 and 55: AccountsPlan A.All Diesel Generatio
Page 56 and 57: then be determined for the 100-year
Page 58 and 59: Comnents received from the city of
Page 60 and 61: FINALENVIRONMENTAL IMPACT STATEMENT
Page 62 and 63: LIST OF PRFPARERSNameExpert i seExp
Page 64 and 65: COMPARATIVE IMPACTS OF ALTERNATIVES
Page 66 and 67: AREAS OF CONTROVERSYTo date no spec
Page 68 and 69: COVER SHEETLIST OF PREPARERSFINAL E
Page 70 and 71: A. NEED FOR AND OBJECTIVES OF ACTIO
Page 72 and 73: alternative has been estimated to p
Page 74 and 75: slopes surrounding Allisorl Lake ar
Page 76 and 77: weir to the mouth, with the majorit
Page 78 and 79: expected to Allison Creek below All
Page 82 and 83: Waterfowl and water related birds f
Page 84 and 85: within the local community. The imp
Page 86 and 87: Cumulative impacts to the Port Vald
Page 88 and 89: Program-related issues. The Alaska
Page 90 and 91: 13.10INDEXSubjectsAffected Environm
Page 92 and 93: APPENDIX AHYDROLOGYTABLE OF CONTENT
Page 94 and 95: snowfields and glacier areas on the
Page 96 and 97: AVERAGE MONTHLY PRECIPITATION(inche
Page 98 and 99: gages at Lowe River near Valdez, Lo
Page 100 and 101: were estimated based on Tonsina Riv
Page 102 and 103: 'fUR r)c r ,-. n:c JA~ FEEl "'A~ AP
Page 104 and 105: --..,I-J--. -,-- - ----- - --TONS I
Page 106 and 107: ALLISON CREEKESTIMATED STREAMFLOW -
Page 108 and 109: APPENDIX BEXISTING SYSTEM ANDFUTURE
Page 110 and 111: IIHf{ODUCTIONThis section is devote
Page 112 and 113: FIGURE: B-1PRICE INCREASES OF DIESE
Page 114 and 115: Installed Generat.or Peak Energy fo
Page 116 and 117: 90008000700060005000- 4000 ~..-:300
Page 118 and 119: Table 4VALDEZ-GLENNALLEN AREA UTILI
Page 120 and 121: As footnoted, the Alaska Power Admi
Page 122 and 123: 201510CDI5.: ...:.T. .' !', ~. '.,
Page 124 and 125: SOLOMON HY I.IICU'-__'lOUIE 1-7 MlN
Page 126 and 127: , .. ,·.AYI.AG! fOWl. DlMANO WHit,
Page 128 and 129: The following is an excerpt from th
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Power Requirement Study (excerpt)GL
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APPENDIX CECONOMIC EVALUATION
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INTRODUCTIONThe purpose of this sec
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value of 66.92 mills/kWh. This figu
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FIGURE C-2: SOLOMON GULCH ALLISON L
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Er.Jployment Benefits Computation (
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energy would be fully utilized. As
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ECONOMIC EVALUATION OF HYDROPONER M
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ECONOMIC EV~LUATION OF HYDROPO~ER M
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------~-~ECONO~IC EVALUATION OF HYD
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ECONOMIC EVALUATION OF HYDROPO~ER M
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ECONO~IC EVALUATION OF HYDROPOwER M
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APPENDI X DPROJECT DESCRIPTION AND
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POWERHOUSETypeTRANSMISSION LINEVolt
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POWERHOUSETypeTRANSMISSION LINEVolt
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VALDEZ HYDROELECTRIC POWER PROJECTG
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turbine. The penstock would bifurca
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TABLE D-lSUMMARY COST ESTIMATEOCTOB
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TABLE 0-3DETAILED COST ESTIMATEVALD
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TABLE D- 3 (cont)Cost Unit Tota 1Ac
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TABL E D-4DETAILED COST ESTIMATEVAL
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TABLE D-4 (cont)Co st Unit Tota 1Ac
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, ..... ,..\ (I),;> "----f .'-.. -I
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"'~~TAPANDROCK TRAP1600.•. -~ "00
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CORPS OF ENGINEERSU. S. ARMY./f----
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APPENDIX EENVIRONMENTAL DATA
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TABLE 1ATEMPERATURE RECORDING OF AL
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TABLE 1A (cont)ALL! SON CREEK (cont
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TABLE 1A (cont)ALLISON CREEK (cont)
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ALLISON CREEK (cont)FEBRUARY HIGH L
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ALLISON CREEK (cant)TABLE lA (cant)
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TABLE 1A (cont)ALLISON CREEK (cont)
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TABLE 1A (cont)SOLOMON CREEK - HIGH
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TABLE 1A (cant)SOLOMON CREEK (cant)
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TABLE 1A (cont)SOLOMON CREEK (cont)
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TABLE lA (cont)SOLOMON CREEK (cont)
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TABLE 1A (cont)SOLOMON CREEK (cont)
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SOLOMON CREEK (cont)TABLE 1A (cont)
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TABLE 2ACalculated Flows of Allison
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TABLE 2BCalculated Flows of Allison
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TABLE 4AWater Quality Data of Allis
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TABLE 4A (cont)PARAMETERCalciumMagn
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TABLE 4A (cont)PARAMETERTurb i d it
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TABLE 4A (cont)PARAMETERTurb i d it
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TABLE 4BALLISON LAKEWA TER QUALI TV
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TABLE 6BIRDS OF THE PORT VALDEZ ARE
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Oregon JuncoTree SparrowWhite-crown
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UNITED STf-lrESDEPARTMENT OF THE IN
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c. Effects on Benthos: The proposed
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An ecological evalu~)tion as requir
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JAY S. HAMMO~D. GOVERNORDEPARTMENr
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CULTURAL RESOURCESAboriginal Settin
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shorp--probablv to facilitate easie
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Today the Alyeska oil terminal enco
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APPENDIX GFOUNDATIONS AND MATERIALS
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100 psi pressure at depth. The sour
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-1'~~ ·/~-IU-'J\·-----'~r-.-;-,~
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~UMi'.'j~'~Y!lfGIOL~ N ..--Pa.w'rln
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; ;; Ii; Z II;;; II til, ;;; : i;;
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Valdez InterimSouthcentral Railbelt
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LIST OF FIGURES AND TABLESPageFigur
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-----------------------------------
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-~~ ~..rt~i~;Valdez Interim ReportS
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alder, salmonberry, blueberry, and
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Table IIPrince William Sound Salmon
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3/ 4/ 5/- - -1976 Average weights b
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the number of pink salmon counted i
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in the fall at the upper end of the
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Table 1 VAllison Creek -Discharge M
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outlet from the lake; however, the
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As stated previously, two alternati
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Discharge measurements are sparse a
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Streambed sedimentation can be caus
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8. That during the construction pha
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LITERATURE CITEDBailey, Jack E., an
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Sharp-shinned hawk - Accipiter stri
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Allison ereekTemperature DataDateTe
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ALLISON CREEKSeptember 1979 . Octob
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ALLISON CREEKDecember 1979 Januarl
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SOLOMON. CREEKSeEtember 1979 Octobe
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7. That clearing for the penstock c
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22. That a cooperative study of the
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APPENDIX IMARKETABILITY REPORT
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Department Of EnergyAlaska Power Ad
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Valdez/Glennallen Power Market Anal
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List of·Tab1esTableIII-1IV-1IV-2V-
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Valdez/Glennallen Power Market Anal
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CHAPTER IISUMMARYValdez and Glennal
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A. Assuming Allison Creek follows S
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CHAPTER IIIPOWER MARKET DESCRIPTION
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increases. Municipal construction h
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CHAPTER IVEXISTING POWER SYSTEMSSys
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TABLE IV-1HISTORICAL LOADS--VALDEZ
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Load FactorsThe following chart lis
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CHAPTER VFUTURE POWER AND ENERGY AS
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Table V-IVALDEZ/GLENNALLEN AREA UTI
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Table V-2INSTALLED CAPACITY REQUIRE
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CHAPTER VI .ALTERNATIVE GENERATION
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Biomass-FiredAlthough of many forms
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A Solomon Gulch article in the Dece
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Net EnergyThis section discusses th
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Table VII-2Valdez/Glennallen Foreca
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40VALDEZ/GLENNALLENCAPACITY/RESOURC
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150Figure VII-3140VALDEZ/GLENNALLEN
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150·Figure VII-5140VALDEZ/GLENNALL
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TABLE VIII-IASummary Cost EstimateO
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TABLE VIII-2Summary Cost EstimatePr
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Table VIII-3AAverage Rate Determina
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Table VIII-4CVEA Diesel Generation
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Table VIII-5Average Rate Comparison
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Table VIII-6Average Rate Determinat
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Table VIII-8Average Rate Determinat
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Table VIII-IOAverage Rate Determina
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----~------T'lble VIII-J 1Average R
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CHAPTER IXBIBLIOGRAPHY1. Power Cost
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: I,B'III Ii ::1: iii,APPENDIX JPUB
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Recipents of Valdez Draft Interim f
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u. s. ENVIRONMENTAL PROTECTION AGEN
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25. ~e str?ngly recOTmend that an a
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UNITED STATES DEPARTMENT OF CO!'!ME
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3. have adequate flows for flushing
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Cnitc:d Srat6 [)c'~,artmcnt of the:
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AdvisoryCouncil OnHistoricPreservat
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Corps Of Engineers - 2 -11/4/80Than
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-2-'2. Most of the State 1 and enco
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-~-The SCH has no objection to this
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ALASKA POWER AUTHORITY333 WEST 4th
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Electrical Power for Valdez and the Copper River Basin-1981

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