HomeMy WebLinkAboutFourth of July and Godwin Creek Conceptual Design 2014
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Fourth of July and
Godwin Creek
Hydroelectric Project
Conceptual Design
Prepared For: Chugach Electric
Association, Inc.
Prepared By: McMillen, LLC
July 2014
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TABLE OF CONTENTS
INTRODUCTION ..................................................................................................................1
DESIGN CONCEPT ..............................................................................................................1
PRELIMINARY HYDROLOGIC INVESTIGATION ................................................................2
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LAND OWNERSHIP .............................................................................................................3
ENERGY GENERATION MODEL ........................................................................................ 3
CONSTRUCTION APPROACH ............................................................................................. 3
REFERENCES ...................................................................................................................... 4
FIGURES ............................................................................................................................. 4
LIST OF FIGURES
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APPENDICES
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Introduction
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References
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APPENDIX A
FOURTH OF JULY CREEK
PRELIMINARY HYDROLOGIC INVESTIGATION
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APPENDIX B
GODWIN CREEK
PRELIMINARY HYDROLOGIC INVESTIGATION
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APPENDIX C
FOURTH OF JULY AND GODWIN CREEK HYDROPOWER
SITE EVALUATION
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APPENDIX D
FOURTH OF JULY CREEK AND GODWIN CREEK
GENERATION MODELS
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectft.Net Head (95% of Ava.Head)ftft.AugSepOctNovDecMean Annual Flow (cfs)(1) General structure layout was based on the "Fourth of July Creek Hydroelectric Project Reconnaissance Study and Initial Feasibility Assessment" (Independence Power LLC, 2009). (2) Estimated Nameplate was calculated based on the 20% exceedance flow, net available head, turbine efficiency (0.85), and generator efficiency (0.98). Annual Energy was calculated by multiplying the mean annual nameplate (determined using the mean annual flow) by the number of hours in a typical year (i.e. 24x365 = 8,760 hrs). (3) Watershed area, basin elevations, percent area of ponds, and percent area of glaciers were estimated using Google Earth ProTM. Mean annual precipitation was estimated utilizing a ESRI shapefile of Plate 2 of the Water-Resources Investigations Report 93-4179 and obtained at http://agdc.usgs.gov/data/usgs/water/statewide.html. Mean January Temperature was estimated from Plate 1 of the Water-Resources Investigations Report 93-4179 obtained from http://pubs.usgs.gov/wri/wri034188/.(4) Mean monthly flows were estimated by scaling the stream gage record (Mean Daily Discharge) of SPRUCE C NR SEWARD AK (#15238600) by the Fourth of July Creek watershed area. (5) Unit Discharge of the Fourth of July watershed was estimated by using the unit discharge of the SPRUCE C NR SEWARD AK (#15238600) stream gage.(6) Exceedance flows were obtained by using the estimated daily flows of the Fourth of July Creek watershed. Daily flow values of the Fourth of July Creek watershed were estimated using the SPRUCE C NR SEWARD AK (#15238600) daily discharge gage record.(7) Frequency event discharges were obtained by utilizing regression equations developed for Region 1 documented in Water-Resources Investigation Report 03-4188.(8) Previous hydrologic studies of Fourth of July Creek are documented in "Fourth of July Creek Hydroelectric Project Reconnaissance Study and Initial Feasibility Assessment" (Independence Power LLC, 2009), USGS Water Resources Investigation 81-21 (investigated suitable water supply for industrial development), USGS Water Resources Investigation 87-4728 (analysis of October 1986 flood event), and feasibility study for the development of an industrial park (Arctic Engineers, 1979).References120Nameplate(2)(MW)15.618.010.64.72.3JanFebMay42.220.8Available HeadWatershed Characteristics(3)670406.6% Area Glaciers187.4140.61.31.2FourthofJulyCreekPreliminaryHydrologicInvestigationClientProjectTaskChugach ElectricFourth of July Creek Permitting/Engineering SupportFourth of July Hydrologic InvestigationCR1Site CoordinatesSheetCreatedChecked9.317Task OrderDate6/6/2014LJDate6/6/2014637Long. -149.27771General Structure Layout(1)1Executive SummaryThe Fourth of July Creek watershed varies in elevation from 790-4,883 ft and is composed primarily of dense coniferous forest, rocky outcrops, and glaciers. The watershed upstream from the proposed intake location has an estimated area of 9.0 sq. mi. There are glaciers present in the watershed (40%) and runoff from rainfall, annual snowmelt, and glacial melt (primary) make up the water sources. Nearby USGS stream gages used in this analysis included the 30.5-year long record of the SPRUCE C NR SEWARD AK (#15238600) stream gage. The structure layout is based on Penstock Route A defined in the "Fourth of July Creek Hydroelectric Project Reconnaissance Study and Initial Feasibility Assessment" (Independence Power LLC, 2009). The estimated unit discharge for the Fourth of July Creek watershed is 8.7 cfs/mi. while the 100-yr event is 2,400 cfs. The estimated nameplate of the turbine is 6.6 MW.REV79031,984 120Proposed Power House ElevationProposed Intake Elevation Annual Energy(2) (MW-hrs)20.8ft.81Aug790Max. Basin Elevation (ft. NAVD88)Min. Basin Elevation (ft. NAVD88)Watershed Area (sq. mi.) Mean Annual Precipitation (in.)Mean January Temp (F)% Area Ponds or Lakes22.7Apr 1.5JulSepJanFebMar Mar 0.4Dec162.495.583.9204.6MayJun3.913.69.04,8832-yrEvent 5% CI 95% CI9651,4801,2601,160Q(cfs)25-yr10-yr1,9101,590100-yr50-yr500-yr5313,5102,8702,4001,7601,0408773,0102,160Watershed Map8.7HydrologyMean Monthly Flows (cfs)(4)Jul6,1204,5904,040130.3Exceedance Flows (cfs) (6)95% 0.1 40% 62.990% 1.8 30% 99.5Lat. 60.0958311.410.4Apr739OctNovMean Monthly Unit Discharge (cfs/mi.2)(5)5-yr 1,330Jun50% 35.580% 5.6 20% 147.270% 11.2 10% 208.160% 18.3 5% 277.1Mean Annual Unit Discharge (cfs/mi.2)Frequency Events (cfs)(7)2,400NTSWatershed BoundaryNDiversion LocationSeward DrydockConceptualDesignPage1of1McMillen,LLCJuly2014
ChugachElectricAssociation,IncAttachmentBFourthofJulyandGodwinCreekHydroelectricProjectft.Net Head (95% of Ava.Head)ftft.AugSepOctNovDecMean Annual Flow (cfs)80% 1.4 20% 307.770% 2.2 10% 446.113340% 42.090% 0.7 30% 155.295% 0.7Exceedance Flows (cfs) (6)Watershed Map10.1HydrologyMean Monthly Flows (cfs)(4)Jul8389,4207,1206,2805,4704,4903,7702,7801301,6201,3701160OctNovMean Monthly Unit Discharge (cfs/mi.2)(5)5-yr 2,090Jun1,5202,2701,9401,7904.0Q(cfs)25-yr10-yr2,9802,480500-yrMean Annual Unit Discharge (cfs/mi.2)Frequency Events (cfs)(7)Dec100-yr50-yr2-yrEvent 5% CI 95% CI17.250% 8.460% 3.1 5% 553.8Lat. 60.10392 Long. -149.28976Sheet3,7203,3504,620Jul2.21.4Apr301.176.253.7228.8MayJun6.1Executive SummaryThe Godwin Creek watershed varies in elevation from 415-5,624 ft and is composed primarily of glaciers with minimal rocky outcrops located at the highest elevations. The watershed upstream from the proposed intake location has an estimated area of 13.3 sq. mi.. There are significant glaciers present in the watershed (63%) and runoff from rainfall, annual snowmelt, and glacial melt (primary) make up the water sources. Nearby USGS stream gages used in this analysis included the 26-year long record of the WOLVERINE C NR LAWING AK (#15236900) stream gage. The WOLVERINE C NR LAWING AK stream gage was chosen as the surrogate for developing flows out of Godwin Creek due the similar percentage of the watershed that is composed of glaciers (75% vs. 63%). The estimated unit discharge for the Godwin Creek watershed is 10.1 cfs/mi. while the 100-yr event is 3,720 cfs. The estimated nameplate of the turbine is 6.1 MW.GodwinCreekPreliminaryHydrologicInvestigationClientProjectTaskChugach Electric4th of July Hydro, Phase II PermittingGodwin Creek Hydrologic Investigation17Task OrderDate6/6/2014LJDate6/6/2014280CR1Site CoordinatesREVProposed Power House ElevationProposed Intake Elevation General Structure Layout(1)1415CreatedChecked(1) General structure layout was based on the intake structure being located at the junction where the two streams draining Godwin Glacier converge. The powerhouse is located at an elevation of 120 feet and is at same location as the powerhouse for Fourth of July Creek Hydroelectric Project. (2) Estimated Nameplate was calculated based on the 20% exceedance flow, net available head, turbine efficiency (0.85), and generator efficiency (0.98). Annual Energy was calculated by multiplying the mean annual nameplate (determined using the mean annual flow) by the number of hours in a typical year (i.e. 24x365 = 8,760 hrs). (3) Watershed area, basin elevations, percent area of ponds, and percent area of glaciers were estimated using Google Earth ProTM. Mean annual precipitation was estimated utilizing a ESRI shapefile of Plate 2 of the Water-Resources Investigations Report 93-4179 and obtained at http://agdc.usgs.gov/data/usgs/water/statewide.html. Mean January Temperature was estimated from Plate 1 of the Water-Resources Investigations Report 93-4179 obtained from http://pubs.usgs.gov/wri/wri034188/.(4) Mean monthly flows were estimated by scaling the stream gage record (Mean Daily Discharge) of WOLVERINE C NR LAWING AK (#15236900) by the Godwin Creek watershed area. (5) Unit Discharge of the Godwin Creek watershed was estimated by using the unit discharge of the WOLVERINE C NR LAWING AK (#15236900) stream gage.(6) Exceedance flows were obtained by using the estimated daily flows of the Godwin Creek watershed. Daily flow values of the Godwin Creek watershed were estimated using the WOLVERINE C NR LAWING AK (#15236900) daily discharge gage record.(7) Frequency event discharges were obtained by utilizing regression equations developed for Region 1 documented in Water-Resources Investigation Report 03-4188. The Frequency Estimates do not account for peak flows caused from glacial-outburst floods caused when ice dams ponding water suddenly burst.(8) This hydrologic investigation did not find any prior studies completed for Godwin Creek.References120 Nameplate(2)(MW)35.922.65.71.00.3JanFebMay12.83.6Available HeadWatershed Characteristics(3)13.35,624ft.476.80.20.1% Area GlaciersAug63415Max. Basin Elevation (ft. NAVD88)Min. Basin Elevation (ft. NAVD88)Watershed Area (sq. mi.)Annual Energy(2) (MW-hrs)23,028 130295Mean Annual Precipitation (in.)Mean January Temp (F)% Area Ponds or LakesJanFebMar Mar 0.132.8Apr 0.3436.01.23.4SepNTSWatershed BoundaryNDiversion LocationSeward DrydockFourth of JulyCreekConceptualDesignPage1of1McMillen,LLCJuly2014
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectTunnel/RofRProject History/Description:Engineer'sEstimateProjectDetails:NTSMobilize:Mobilizationofequipment,materialsandlabortoSewardfromeitherAnchorageorSeattle(viabarge).OverheadItems:TemporarymanͲcampandrelatedancillarysupportequipment,fuel,etcfor3years.AccesstoSite:Approximately4,300feetofnewroadfromeastoftheStateprisontoPowerhouselocationabovealderbrush.NewbridgetocrossGodwinCreek,~200feetinlength,locatedabovehighwatermarktoavoiddebrisflows.Tunnel&Dam:NodamoneitherFourthofJulyorGodwinCreekduetohighintermittentdebrisloadsinstream(s).TunnelwillextendfromJulyintake.Tunnelwillbeapproximately16feetdiameter(horseshoeportal).Penstock:FourthJulyͲ147CFS(20%exceedance)through4.5'diametersteelpenstockͲ5,100feetlengthGodwinͲ308CFS(20%exceedance)through6.5'diametersteel/HDPEpenstockͲ2,800feetlengthIntake:ConcreteIntakeonFourthJulyCreek/IntakeonGodwinCreekwithsilttraps.SubmitFERCapplicationtoreflectnewapplicantTrashrackonintakestobyͲpasslargediameterrocks,andwoodydebris.Powerhouse:GodwinͲNetheadof280feetby308CFSͲ6.1MWNameplateͲSeparateturbinefromFourthofJuly.StandardfordesignwithlimitedsiteinformationSwitchYard:Switchyardfor69kV.SwitchyardlocatedatthePowerplantsite.TailRace:DischargetailwaterintotheFourthofJulyCreekatelevationof120feet.Dischargechannelis130feetinlengthNamePlateofNewMW: 12.7 MWTransmission&Interconnection:Overheadtransmissionlinefrompowerplant10,900feettoSubstation.Engineering&PermittingͲ15%$11,423,297Lat. 60.098543 Long. -149.299714Task Order 14005FourthofJulyandGodwinCreekHydropowerSiteEvaluationConstruction Schematic Site CoordinatesClientChugachElectricCreatedLJDate7/7/2014CheckedMEDateTaskCivilEngineering&ConstructionReviewSheet1REVProjectFourthofJulyCreekPermitting/EngineeringSupportThissitewasoriginallyexaminedbyaprivateenergydeveloperin2008Ͳ09.Perthatfeasibilitystudy,onlytheFourthofJulyCreekwasconsideredforhydropowerdevelopment(GodwinCreekwasnotincludedinthisfeasibilitystudy).KeyparametersfromthatstudyincludedanintakestructureattheheadwatersoftheFourthofJulyCreekat790feetm.s.l.The2009feasibilitystudydesignincludedtheintakeaspartofeithera14or40foothighdam(finaldamheightwasnotdetermined).TwoͲ48”diameterpenstockrouteswereidentified.Routingoptionswerebasedontopographyconstraints&bedrock.A5.4MWpowerhousewasproposedatafinalelevationof120feetm.s.l.netheadis676feet,flowof120cfs.TailwaterwastobedirectedtotheFourthofJulystreambed.[Ref:IndependencePowerLLC,November2009,“FourthofJulyCreekHydroelectricProjectReconnaissanceStudyandFeasibilityAssessment”].Perthe2014McMillensiteinvestigation,observedfeaturesofbothGodwinandFourthofJulyCreekincludedhighsediment/siltloads,largediameterwoodydebrisinthestreambed,andawidebraidingchannelgeomorphology.Hydrologyrecordsfrom2008Ͳ09indicatesfive(5)floodingeventsexceeding350+cfsflowandoneeventover500cfs.In2014,constructionaccesstothissiteisproposedalongthenorthernsideofGodwinCreek(throughmaturevegetation),withonebridgecrossingGodwinCreek.TransmissionisdirectlyrouteddownthecenteroftheFourthofJulyvalleytotheIndustrialParksubstation.AMcMillendesignincludesintakesonbothGodwinandFourthofJulyCreek,foracombined12.7MWpowerhousedesign.1ConstructionItemConstructionEstimateJune2014Mobilize$770,903CommentsStandardMobfromAnchorage/bargematerialstoSewardfromSeattleAccessRoads$1,363,891DamandSpillway$0Demobilize$247,467The2014costestimateisbasedonroutingwaterfrombothGodwinandFourthofJulyCreek(s)throughacommonpowerhouse,viatwoseparateturbines.InNovember2009,aFourthofJulyoptionwasestimatetohaveacapitalcostof$10to$21.6Milliondollars.ThisestimateisbasedonhydropowerdesignelementsfromtheMay2014siteinvestigationandisbasedonMcMillenhydropowerexperienceatotherlocationsinAlaska.Thisestimateassumesa2to3yearconstructioncycle.Workwillcontinuethroughthewinter(tunnel&powerhouse).Majortaskitemsforthisprojectincludenewroadconstructionandbridge;twointakes,tunneling,powerhouseconstruction,transmission,switchyard,andinstallingtwooverlandpenstocks.Overheads$12,796,584TunnelfromIntaketoabovepowerhouse$22,246,630Powerhouse$20,049,480SwitchYard$2,090,000PenstockfromGodwinCreek$6,648,500IntakesonFourthofJuly/GodwinCreek$1,960,000PenstockfromFourthofJulyCreek$5,319,100TailRace$204,750Estimate69kVlinetoexistingsubstationlocatedSWofPrisonInterconnection$592,000Warehouse&Shop$0Transmission$1,866,006TailracedivertedbackintoFourthofJulyCreekWarehouseandShopbuildingatPowerhouseSiteundermobilization10,900feetor~2milesof69.5kVlinefromPowerhousetoexistingSubstationConnectionatSubstationatSewardIndustrialYard/SWfromPrisonRegulatory&AgencyConsultation5%$3,807,766Subtotal$76,155,311AlaskaRatesContractorProfitͲ15% $11,423,297StandardforAlaskaFourthJulyͲNetheadof637feetby147CFSͲ6.6MWNameplateͲSeparateturbineConceptLevelContingencyͲ30%$22,846,593Total:$125,656,263ExistingSubstationlocatedatFourthofJulyCreekIndustrialParknearsaltwater.Equipment/Rentals/Templaydownfor2to3yearsofworkStandarddemobolizationoffsite4,300feetwithoneoverheadbridge165feetNodamsorstorageattheFourthofJulyCreekComplexTunnel~3460feet16'diameter/horseshoe/becomesroadtointakeonFourth5,200feetof4.5'diametersteelpenstockfromCreektoPowerhouse3,500feetof6.5'diameterofabovesteegroundpenstockConcreteIntakesatbothcreekswithsiltcontrolandtrashracks.CommonBuildinwwithtwoturbinesratedat6.6MWforJulyat6.1MWatGodwinNConceptual DesignPage 1McMillen, LLC July 2014
ChugachElectricAssociation,Inc. AttachmentC FourthofJulyandGodwinCreekHydroelectricProject
ConstructionEstimate
ConstructionItem McMillenEst.
July2014 Comments
Mobilize $770,903
Overheads $12,796,584
Demobilize $247,467
AccessRoads $1,363,891
Tunnel$22,246,630
PressureShaft $0
Penstock$11,967,600 $5,319,100 $5.3Mfor4thofJulyCreekPenstock
Intake $1,960,000 $6,648,500 $6.6MforGodwinCreekPenstock
Powerhouse $20,049,480 $11,967,600
SwitchYard$2,090,000
TailRace $204,750
Housing $0
Transmission $1,866,006
Interconnection $592,000
Subtotal $76,155,311
Regulatory(5%) $3,807,766
Engineering&PermittingͲ15%$11,423,297
ContractProfitͲ15%$11,423,297
ConceptualLevelContingencyͲ30%$22,846,593
Total $125,656,262
Conceptual DesignPage 2 McMillen, LLC
July 2014
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectUnit UnitCost Qty Cost Total1 McMillenTot.CommentsEa $7,763 1 $7,763Ea $3,792 1 $3,792Ea $5,706 2 $11,413Ea $5,175 2 $10,350Ea $1,380 4 $5,520Ea $1,118 4 $4,471Ea $2,933 2 $5,865Ea $1,208 2 $2,415Ea $5,175 1 $5,175Ea $5,175 6 $31,050Ea$863 1 $863Ea $3,145 2 $6,289Ea $3,278 1 $3,278Ea $1,553 1 $1,553Ea $1,553 1 $1,553Ea $10,200$0Ea $1,553$0Ea $1,380 1 $1,380Ea $1,208 6 $7,245Ea$932 1 $932Ea$863 1 $863Ea $12,600$0Ea $8,970 1 $8,970$149,746Hr $52.57 240 $12,617LaborChange$85to$52.57Laborer,usingtheAlaskaDepartmentofLaborChartlump $3,600 2 $7,200SubTotal$19,817Hr $52.57 90 $4,731LaborChange$85to$52.57Laborer,usingtheAlaskaDepartmentofLaborChartSubTotal$4,731Hr $52.57 540 $28,388LaborChange$85to$52.57Laborer,usingtheAlaskaDepartmentofLaborChartSubTotal$46,440$28,388ea $35,000 1$35,000ShippingandHandling4thofJuly&GodwinCreekMobilizationTruckͲFlatbedBackhoeCat420ETruckͲBoomBatchPlantConcreteTruckContainers20,000lbsTruckServiceForkliftRockCrusherFuelSurchargeSetUpShopSubTotalFuel&MiscExpenseDescriptionFrontEndLoaderCat966HTruckͲSemiExcavatorCat345CEquipmentShippingMobileCrane120TonMobileCrane45TonDumptruckPickupAirTrackDrillCompressorͲStationary1000cfmOfficeTrailerDozerD8TGraderCat14MCrewQuartersSetUpOfficeTrailerMoveEquipmentToSiteLaborBuildingPurcahse40x60SetupCrewQuartersConceptual DesignPage 3McMillen, LLC July 2014
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectUnit UnitCost Qty Cost Total1 McMillenTot.Comments4thofJuly&GodwinCreekMobilizationDescriptionHr $54.25 40 $2,170$922 LaborChange$85to$54.25Concrete/Finsher,usingtheAlaskaDepartmentofLaborChartlump $6,200 1 $6,200$6,200lb$0.52 4525 $2,353$2,353lump $13,100 1 $13,100$13,100Hr $59.18 270 $15,979$15,979 LaborChange$85to$59.18Carpenter,usingtheAlaskaDepartmentofLaborChartlump $3,600 1 $3,600$3,600lump $6,200 1 $6,200$6,200Lump $15,800 1 $15,800$15,800Lump $21,000 1 $21,000$21,000SubTotal$120,154ea $35,000 1 $35,000$35,000ShippingandHandlingHr $54.25 24 $1,302$922 LaborChange$85to$54.25Concrete/Finisher,usingtheAlaskaDepartmentofLaborChartlump $6,200 1 $6,200$6,200lb$0.52 4525 $2,353$2,353lump $21,000 1 $21,000$21,000Hr $59.18 270 $15,979$15,979 LaborChange$85to$59.18Carpenter,usingtheAlaskaDepartmentofLaborChartlump$3,6001$3,600$3,600lump $6,200 1 $6,200$6,200Lump $15,800 1 $15,800$15,800Lump $21,000 1 $21,000$21,000SubTotal$128,054Hr $54.25 24 $1,302$922 LaborChange$85to$54.25Concrete/Finisher,usingtheAlaskaDepartmentofLaborChartlump $6,200 1 $6,200$6,200lb$0.52 4525 $2,353$2,353Fuel&MiscExpenseSetupcompressorsFormsͲLaborandMaterialRebarWireBuildingͲLaborandMaterialSetUpWarehousePourConcreteFooterandFloorLevelsiteFinishInteriorͲLaborandMaterialPourConcreteFooterandFloorBuildingPurcahse40x60SetUpCompressorBuildingLevelsiteFormsͲLaborandMaterialRebarPlaceConcreteͲLaborandMaterialErectBuildingFinishInteriorͲLaborandMaterialLaborFuel&MiscExpenseInsulateBuildingͲLaborandMaterialInsulateBuildingͲLaborandMaterialWireBuildingͲLaborandMaterialLaborRebarLevelsiteFormsͲLaborandMaterialPourConcreteFooterandFloorPlaceConcreteͲLaborandMaterialErectBuildingConceptual DesignPage 4McMillen, LLC July 2014
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectUnit UnitCost Qty Cost Total1 McMillenTot.Comments4thofJuly&GodwinCreekMobilizationDescriptionlump $21,000 1 $21,000$21,000ea $35,000 1 $35,000$35,00015% $35,000 $5,250$5,250Hr $59.18 270 $15,979$15,979 LaborChange$85to$59.18Carpenter,usingtheAlaskaDepartmentofLaborChartlump $3,600 1 $3,600$3,600lump $6,200 1 $6,200$6,200Lump $15,800 1 $15,800$15,800Lump $21,000 1 $21,000$21,000lump $50,000 1 $50,000$50,000SubTotal$183,304Lump $100,000 1 $100,000SubTotal$100,000Total$770,903 TheMobeRateforEstimate1IncludesDemobSewageSystemInsulateBuildingͲLaborandMaterialWireBuildingͲLaborandMaterialFinishInteriorͲLaborandMaterialSetCompressorsandWiringFuel&MiscExpensePlaceConcreteͲLaborandMaterialErectBuildingPurchaseBuildingShippingandHandlingLaborConceptual DesignPage 5McMillen, LLC July 2014
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectUnit UnitCost Qty Cost Rent(1Mon.) Total1 McMillenTot.CommentsEa $600,0001 $600,000$16,000$192,000BiggeCraneRentalEa $216,0001 $216,000$6,000$144,000BiggeCraneRentalEa $188,0002 $376,000$9,750$468,000CescoRatesEa $168,0002 $336,000$16,500$792,000CescoRatesEa $52,0004 $208,000$4,250$408,000CescoRatesEa $35,0004 $140,000$140,000DependsonMakeandModelofTrucks,Itcouldgoupordownfrom$35KEa $125,0002 $250,000$5,000$180,000BrokkoutofSeattle,WAEa $225,0002 $450,000$6,600$316,800UnitedRentals,purchasedprice$140K+Ea $16,0001 $16,000$800$19,200MobileMiniRates,withoutDeliveryCrewQuartersEa $64,0005 $320,000$64,000$1,536,000LodginginSewardAlaskaoratGravelPitownedbyCityEa $144,0001 $144,000$7,200$172,800CescoEa $132,0002 $264,000$9,500$456,000CescoEa $45,0001 $45,000$3,800$91,200CescoEa $40,0001 $40,000$3,800$91,200CescoEa $75,0001 $75,000$5,000$120,000BiggeCraneEa $500,000$0$0 MobilizationofaBatchPlantis$100KtotheLower48.ThecostofaBargedinBatchPlantwillicreaseby$50K.ReferenceͲFt.RandallProjectEa $80,000$0$0 NeedtopurchaseaConcreteTruckasitisalomostimpossibletofindoneforRent.PurchasePriceforaConcreteTruckis$75K+Ea $50,0001 $50,000$5,500$132,000Addanother$4500foraMannedTruckEa $125,0001 $125,000$2,800$67,200CescoRatesEa $1,025 1 $1,025 $3,400$81,600CescoRatesEa $750,000$0$69,000$0 ThisisforaJawtodoinitialBreak$29K,andImpacttocrushinto3/4"to11/4"aggregateforConcrete$29K,andaScreen$13K.LightPlantEA4$850$81,6001MonthTotalRentalRates174,900(12mos.)=$2,098,800+BatchPlant$500K+$80KConcreteTruck+$500KFloatingManCamp=TrackedSkidSteerEA3$2,925$210,600CescoGenerator70KVAEA2$2,000$96,000WillneedsomekindofGeneratortostarttheJobsiteaswellasworkingindifferentareas,thesizecanbereducedtosmallerportablegens.WelderMiler250AMPEA2$650$31,200MachineryTraderNote:AllSubTotalsforEquipment=18MonthRentalxthenumberofpieces,MobeandDemobeareSeparateFuelForTheEntireJobHR $769 2190$1,684,110$1,684,110NeedtodiscussusageofMachines,CostisforMachinesrunning1/4ofthetimeonjobsite4805HorsePowerAllMachinesx.04FuelFactorhr.x$4Gallon=$769HrforallMachines730Daysx12Hrs=8760Hrs.,Machinesrunning1/4Time=2190hrsx$769=$1,439,568SkiffEA $10,0000$0$0 SkifftogetaroundonWaterSubTotal$7,511,510TheCostusingthedifferentRateswefound,withBiggeCrane,Cesco,WinterInc.BatchPlants,RasmussenDay $550 4160 $2,288,000$2,288,000TheCostof2FullTimeMechanics,1Greaser,and1Mechanic,$50anhourx2menx12hr.Day=$1200injustManHours,addanotherSubTotal$0$2,288,00053PiecesofEquipmentx12hrs/dayx1.36$perhr=Parts/Maintenance$865perDay+$1200=2065hr $50 8320 $416,000$416,000Ratefrom$86to$50forLaborDOLAlaskahr $61$0$0 Ratefrom$86to$60tookanavarageofallratesfromDOLAlaska,NotsurewhatthisisforandifweareDoubleDippingInternet,Phone,SateliteMos. $800$0$0 SatPhone$500Month,HughesInternet$200Month,DirectTVCable$100MonthSubTotal$416,000Reduced$86Hr.to$50Hr.usingtheAlsaskaDepartmentofLaborHoursCamplump $1,2001095 $1,314,000$1,314,000AtthisRate15Menwouldeatfor$80aDayhr $52.57 12480 $656,074$656,074Ratefrom$86to$50,NotsurewhatacookwouldgoforsoIusedaLaborerRateof$52.57lump $150,0001 $150,000$150,000PlaneTicketsFromBoisetoAnchorage,15Menx1PlaneTicketaMonthRoundTrip$886x18Mos.=$2392204ManKubotaslump $20,0002 $40,000$40,0002Ͳ4ManKubotas4x4forhaulingguysbackandforthATVlump $7,0003 $21,000$21,0003FourWheelerstorunpartsSubTotal$2,181,074DailyHelicopterUsehr $2,500$0$0SubTotal$0BargeExpenseslump $400,0002 $800,000$800,000SubTotal$400,000Total$12,796,584OverheadistheSameasMahoneyCrewTransportationͲToTownandBackTruckͲFlatbedGraderCat14MFieldPersonnelPersonnelOfficePersonnelͲHomeOfficeEquipmentMaintenanceTruckͲBoom17TonConcreteTruckTruckServiceBackhoeCat420ERockCrusherBatchPlantDumpTruckPickupCompressorͲStationary1000cfmFoodMessHallLaborOfficeTrailerFrontEndLoaderCat966HTruckͲSemiAirTrackDrillForklift(ExtendedReach)4thofJuly&GodwinCreekConstructionOverheadDescriptionEquipmentpurchaseandrentalMobileCrane120TonDozerD8TMobileCrane45TonExcivatorCat345CConceptual DesignPage 6McMillen, LLC July 2014
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectUnit UnitCost Qty Cost Total1 McMillenTot.CommentsEa $7,763 1 $7,763Ea $3,792 1 $3,792Ea $5,706 2 $11,413Ea $5,175 2 $10,350Ea $1,380 4 $5,520Ea $1,118 4 $4,471Ea $2,933 2 $5,865Ea $1,208 2 $2,415Ea $5,175 1 $5,175Ea $5,175 6 $31,050Ea $863 1 $863Ea $3,145 2 $6,289Ea $3,278 1 $3,278Ea $1,553 1 $1,553Ea $1,553 1 $1,553Ea $10,200$0Ea $1,553$0ConcretefromCityofSewardAlaskaEa $1,380 1 $1,380Ea $1,208 6 $7,245Ea $932 1 $932Ea $863 1 $863Ea $12,600$0Ea $8,970 1 $8,970$120,736 $120,736Hr $52.57 120 $6,308$6,308 Reduced$86Hr.to$52.57LaoborerrateusingtheAlsaskaDepartmentofLaborHourslump $3,600 1 $3,600$3,600SubTotal$9,908 LaborChangeHr $52.57 80 $4,206$4,206 Reduced$86Hr.to$52.57LaoborerrateusingtheAlsaskaDepartmentofLaborHoursSubTotal$4,206 LaborChangeHr $52.57 240 $12,617$12,617 Reduced$86Hr.to$52.57LaoborerrateusingtheAlsaskaDepartmentofLaborHoursSubTotal$12,617LaborChangelump $30,000 1 $30,000$35,000 2 $70,000SubTotal$100,000 $100,000Total$247,467RemovecompressorsRemoveCompressorBuildingRemoveOfficeTrailerRemoveCrewQuartersRockCrusherFuelSurchargeSubTotalMoveEquipmentAwayFromSiteLaborFuel&MiscExpenseRemoveCompressorsForkliftCrewQuartersGraderCat14MFrontEndLoaderCat966HTruckͲSemiTruckͲFlatbedTruckͲBoomBatchPlantConcreteTruckTruckServiceContainers20,000lbsBackhoeCat420E4thofJuly&GodwinCreekDemobilizationOfficeTrailerDescriptionEquipmentShippingMobileCrane120TonMobileCrane45TonExcavatorCat345CDozerD8TDumptruckPickupAirTrackDrillCompressorͲStationary1000cfmConceptual DesignPage 7McMillen, LLC July 2014
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectUnit UnitCost Qty Cost McMillenCommentsMile$787,884.001$787,884AtleastonebridgebasedonMapscy $150$0$0 Changefrom$50CYto$150CY,AlaskaBlueLakeNumbersmi $25,000$0$0cy $20 15000 $300,000 $300,000 Changefrom$57CYto$20CY,Sewardprovidegravelfromlocalpitmi $25,000$0$0Subtotal$1,087,884cy $20 200 $4,000 $4,000 Changefrom$70to$20CY,MassExcavation$5Ͳ$10CY,DoubledRateDuetoPossibleConditionsf$8 400 $3,200 $3,200 Changedfrom$12to$8,Formsarebetween$4and$6aSF,$8duetothelocationlb $2 5040 $7,560 $7,560 Changefrom$7lb.to$2,usually$.40Ͳ$.50Lbscy $190 120 $22,800 $22,800lb $4 35820 $143,280 $143,280 Changedfrom$.42lb.to$4lb.CurrentRatesfroStructuralSteel$2Ͳ$4hr $59.08 960 $56,717 $56,717 Ratefrom$86to$59.08IronworkerforLaborDOLAlaskasf$12 2300 $27,600 $27,600hr $54.25 200 $10,850 $10,850 Ratefrom$86to$54.25Concrete/FinsherforLaborDOLAlaskaSubtotal$276,007cy $20$0Changefrom$70to$20CY,MassExcavation$5Ͳ$10CY,DoubledRateDuetoPossibleConditionsf$8$0Changedfrom$12to$8,Formsarebetween$4and$6aSF,$8duetothelocationlb $2$0Changefrom$7lb.to$2,usually$.40Ͳ$.50Lbscy $190$0lb $4.00$0Changedfrom$.70lbs.to$4lbs.hr $59.08$0Ratefrom$86to$59.08IronworkerforLaborDOLAlaskasf$12$0hr $54.25$0Ratefrom$86to$54.25Concrete/FinsherforLaborDOLAlaskaSubtotalTotal$1,363,891InstallationBridgeConstruction30FootAbutmentExcavationAbutmentConcreteFormsRebarConcreteͲMaterialandLaborSteelMaterialLaborDeckPrecastConcreteDeckingRoadBaseGravelFinishGradeInstallationBridgeConstruction180FootAbutmentExcavationAbutmentConcreteFormsRebarConcreteͲMaterialandLaborSteelMaterialLaborDeckPrecastConcreteDecking4thofJuly&GodwinCreekRoadConstructionDescriptionRoadConstruction1mileDrillandBlastSubGradeFillandExcavationConceptual DesignPage 8McMillen, LLC July 2014
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectUnit UnitCost1UnitCostMcMillenQty Total1 McMillenTot.CommentsLF $1,042 $6,356 3500$22,246,630Changewas$3,294aLFBlueLakeAlaska,March2014The$3294isallinandthe$1040.30isaDrillandBlastChangetunnelcosttomatchAllisonCreek16footdiameterhorseshoeat$6,356.18/LNͲFtCY $70817952CWT $11127202700feet=4960unit//17952=127202ReinforcementLB $169600RockBolts(1"x10')LF $423600SubTotal$0Thetotalontheleftisallthecostaddewdupforthe90'sestimateTotal$0 $22,246,630CementTunnelLining1'(700Lf)4thofJulyCreekTunnelDescriptionDrillandBlastLowerTunnelFinishedTunnelSize10'x10'HorseshoeConcreteConceptual DesignPage 9McMillen, LLC July 2014
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectUnit UnitCost Qty Cost Total1 McMillenTot.Commentscy $850$0 $1,509,600ChangewasBlueLakeShaftPriceof$3130Ft.SubTotal$0$0linFt $735 500$367,500BlueLakeis$4261aSetspacedat2Feet.,1370ft/2ft=685SetsSubTotal$0cf $83 3500$290,500GroutRuns$10Ͳ$80aBag,DependingontheBagthisnumberwillchange,UsedoldnumbersfromaJobinSeattle,$47CFSubTotal$0Total$0$0VentandAirLineConcreteTunnelSupportGroutingNoPressureShaftConstructionDescriptionDrillandBlastPresssureShaftExcavatedSizeͲ5'x7'x1370'LongIncludesAllLaborandMaterialͲIncludingConceptual DesignPage 10McMillen, LLC July 2014
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectUnit UnitCost1UnitCostMcMillenQty Total1 McMillenTot.CommentsAC $5,000 $8,500$0SubTotal$0EarthenDamCY $57 $150$0CY $14 $20$0LF $85 $173$0LF $64 $120$0ConcreteMassCY $142 $190$0Sheetpile677x12=8,124sfUnit $481 $3,848$0$4,200 HescowallDF4836ErosionBarriercost$481per12feetor$3,848/100feetCWT $11 $22$0LB $1 $2$0Gates(Outletworks)(2ea4'x4')17,000LB LS $85,000$136,000$0Trashrack4,000LBLS $11,000$24,000$0$0CY $57 $150$0Estimate1000CY $14 $20$0LF $85 $173$0LF $64 $120$0CY $142 $190$0CY $708 $1,200$0GuessbasedonsmallerspillwaydesignCWT $11 $22.00$0LB $1 $2 $0$0Total $0 $0ConcreteStructuralCementReinforcementSubTotalConcreteMassDrillingandGroutingDrainHolesHescoblockwallCementReinforcingSteelSubTotalSpillwayRockExcavationCommonExcavationDrillingandGroutingDrainHolesCommonExcavationNoDamDescriptionReservoirClearingRockExcavationConceptual DesignPage 11McMillen, LLC July 2014
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectUnit UnitCost1UnitCostMcMillenQty Total1 McMillenTot. CommentsLF $1,003 5200 $5,215,600 4thofJulyunitcostbasedonratesheetPenstock(6.5'x3500') LF $1,871 3500 $6,548,500 GodwinCreekunitcostbasedonratesheetLB $3 595000LB $3 41700ConcreteAnchorBlocks(20CY) EA $11,000 3EA $6,390 18CWT $11 830ReinforcementLB $1 4400Clearing(30') AC $1,400 $1,400 5 $7,000 $7,000 4400LN.feetx30'W=132,000=~5acresͲLoggingofsiteGravelforfoundation CY $20 $20 10000 $200,000 $200,000 4400x2x30=~10,000yardsofgravelͲSewardprovides?SubTotalTotal$207,000 $11,771,100$5,319,100$6,648,500ConcreteSupports(9CYEA)4thofJuly&GodwinCreekPenstocksCementDescriptionPenstock(4.5'x5200')Steel(A537)Steel(AͲ36)RingStiffenersExp.Anchors,Anchor,Supports,Etc.Conceptual DesignPage 12McMillen, LLC July 2014
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectUnit UnitCost qty Cost McMillenCommentsLS $980,000 2$1,960,000 2014SullivanLakeWashingtonTͲScreenbottomofTriangleLakedesignedfor160cfsthrough54"pipeSubTotalLS$295,000$0 RWBeck1998estimatemoved15yearsforwardat5%peryearFloatingIntakeonTriangleLakehr $60.19$0$0lump $10,000$0$0cy $950$0$0SubTotal$0Total$1,960,000 Needtofurtherdefineintakesoncewehavesurveyinformationoflocations4thofJulyandGodwinCreekIntakeSiphoncost(unitcostforSunriseLake)DescriptionInstrumentationLaborMaterialGodwin&4thofJulyCreekDrillandBlastIntakeBreakThroughConceptual DesignPage 13McMillen, LLC July 2014
ChugachElectricAssociation,Inc.AttachmentC FourthofJulyandGodwinCreekHydroelectricProject
Unit UnitCost Qty Cost McMillenComments
Lorentofollowuponsizingofbuilding
cy $20 500 $10,000 $10,000 Estimateonly
SubTotal $10,000 Changedfrom$125to$20aCYasmostmassExcavationisclosureto$10CY,DoubleditduetoConditions
hr $59.18 1296 $76,697 $76,697 Ratefrom$86to$59.18CarpenterforLaborDOLAlaska
sf $7.00 3240 $22,680 $22,680 Changedfrom$4.20SFto$7SF
hr $59.18 1296 $76,697 $76,697 Ratefrom$86to$59.18CarpenterforLaborDOLAlaska
sf $7.00 3240 $22,680 $22,680 Changedfrom$4.20SFto$7SF
hr $59.18 4500 $266,310 $266,310 Ratefrom$86to$59.18CarpenterforLaborDOLAlaska
sf $7.00 11250 $78,750 $78,750 Changedfrom$4.20SFto$7SF
hr $59.18 5400 $319,572 $319,572 Ratefrom$86to$59.18CarpenterforLaborDOLAlaska
sf $7.00 13500 $94,500 $94,500 Changedfrom$4.20SFto$7SF
hr $59.08 2800 $165,424 $165,424 Ratefrom$86to$59.08IronworkerforLaborDOLAlaska
lb $2.00 280000 $560,000 $560,000 Changedfrom$4.20SFto$7SF
hr $54.25 550 $29,838 $29,838 Ratefrom$86to$54.25Concrete/FinisherforLaborDOLAlaska
cy $115 2100 $241,500 $241,500
SubTotal $1,954,648
Lump
hr $62.19 400 $24,876 $24,876 Ratefrom$86to$62.18ElectricianforLaborDOLAlaska
ft $5.50 5000 $27,500 $27,500
hr $62.19 960 $59,702 $59,702 Ratefrom$86to$62.18ElectricianforLaborDOLAlaska
lump $35,000 1 $35,000 $35,000
hr $62.19 1030 $64,056 $64,056 Ratefrom$86to$62.18ElectricianforLaborDOLAlaska
lump $150,000 1 $150,000 $150,000
hr $62.19 1050 $65,300 $65,300 Ratefrom$86to$62.18ElectricianforLaborDOLAlaska
lump $260,000 1 $260,000 $260,000
ea $90,000 1 $90,000 $90,000
hr $62.19 400 $24,876 $24,876 Ratefrom$86to$62.18ElectricianforLaborDOLAlaska
lump $60,000 1 $60,000 $60,000
$0
Ea $70,000 1 $70,000 $70,000
hr $62.19 120 $7,463 $7,463 Ratefrom$86to$62.18ElectricianforLaborDOLAlaska
SubTotal $938,772
Lump $500,000 1 $500,000
SubTotal $500,000
Lump
hr $52.57 1500 $78,860 $78,860 Ratefrom$86to$52.57LaborerforLaborDOLAlaska
lump $70,000 1 $70,000 $70,000
SubTotal $148,860
ea $1,170,000 12.7 $14,859,000 $14,859,000 EmailfromCanyonHydroonMarch13,2014
ea $250,000 2 $500,000 $500,000
hr $62.19 4000 $248,760 $248,760 Ratefrom$86to$62.19ElectrcianforLaborDOLAlaska
lump $100,000 1 $100,000 $100,000
SubTotal $15,707,760
Gantrycrane
ea $135,000 1 $135,000 $135,000
hr $59.08 1250 $73,850 $73,850 Ratefrom$86to$59.08IronWorkerWageforLaborDOLAlaska
lb $1.15 9000 $10,350 $10,350
lb $4.00 79200 $316,800 $316,800 Changedfrom$.80lbs.to$4asinotheractivities
lb $4.00 63360 $253,440 $253,440 Changedfrom$.80lbs.to$4asinotheractivities
SubTotal $789,440
Total $20,049,480
Communications
andSurgeArrestor
Shipping
InstallͲLabor
Piping
InstallAllPipingͲInstallationandMaterial
Labor
Material
TurbineandGeneratorPackage12.7MW
SecondaryCommunicationonFiberfail
Material
DCSystem
Labor
MaterialͲBatteryRoom
WideFlange24x11.75
Purchase
Install
CraneRail
WideFlange40x11.75
MiscellaneousMaterial
LocalService
Battery&Charger
SwitchesandEqipment
Labor
IncludesTurbine,Generator,TurbineInlet
Valve,Governor,Exciter,VoltageRegulator
Material
SwitchBoardw/Components
MediumandHighVoltageͲInstallation&Mat.
ControlRoom
Labor
Deck
Labor
Material
Walls
Labor
Labor
Material
Beams
Labor
Material
4thofJuly&GodwinCreek(Twoturbinesunderonecombinedbuilding)Powerhouse
Description
PowerhouseSize40x60
Columns
Excavation
Concrete
FormsͲInstallandStripͲLaborandMaterial
Labor
Material
ReforcingSteelͲLaborandMaterial
Labor
Material
PlaceConcreteͲLaborandMaterial
Labor
Material
Labor
Material
ConduitͲInstallationandMaterial
Labor
Material
LowVoltageWiringͲInstallationandFixtures
Electrical
Conceptual DesignPage 14 McMillen, LLC
July 2014
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectUnit UnitCost Qty Total1 McMillenTot.CommentsLS $2,090,000 1 $2,090,000REF:Jan2011ͲConnellyLake12,$1,900,000HainesAlaskaLS $282,000 1Groundmat,Disconnect,SwitchandGround,SwicthBusLS $21,000 1SurgeArrestorsEA $5,660 4ExcavationRockCY $57 4600TaleoffTowerLB $3.20 29000SubTotal$0$0Total$2,090,000 Chugachmayhavealineitemforatypcialswitchyard4thofJulyandGodwinCreekSwitchyard(singularunit)Description69.5kVSwitchyardatthePowerhousePowerTransformerConceptual DesignPage 15McMillen, LLC July 2014
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectUnit UnitCost Qty Cost McMillenCommentscy $65 500 $32,500 350'Lx8'Wx4'D=420CYSubTotal$32,500WhatSizePipewithCostinSreadsheetthiswouldbea60"PipeMaterialft $165$0InstalationLump $56,000$0SubTotal$0RipRapsy $65 2500 $162,500SubTotal$162,500Total$204,750 Excavateachannelto4thofJulyCreekinnativesoils,utilizeripraptoslowvelocity4thofJulyandGodwinCreekTailraceDescriptionExcavateChannelLayRCPPipeConceptual DesignPage 16McMillen, LLC July 2014
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectUnit UnitCost Qty Cost Total1Commentsea $175,000$0$0 GreenEarthGlobalInc.,HousemadeofFoam,SteelandConcrete,Mold,Fire,andInsectResistant,200MPHWindRating,EnergyEfficientShippingandHandlinglump 15% $0 $0$0 ShippingCostwouldbe4SemiLoads,Enclosedin10hrs.OnsiteSubTotal$0ea$2,600$0$0Foundationea $10,200$0$0SubTotal$0SetUpHouseea $10,300$0$0Powerea $5,000$0$0SubTotal$0Total$0 SavingsinHouseandShippingNoHousing(LiveinSeward)DescriptionPrefabricatedHouseSitePrepConceptual DesignPage 17McMillen, LLC July 2014
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectUnit UnitCost Qty Cost McMillenCommentsmi $3,500,000$0mi $279,166$0Transmissioncostfor69kVlinemi $905,828 2.06 $1,866,006KakeͲPetersburgIntertiecostsͲFeb2012$1,866,006Fibermi $12,000$0$0Total$1,866,006 WagcostbasedonotherTransmissioncostsͲChugachmayhaveaninternalnumbertheyutilizeSubTotal4thofJuly&GodwinCreekTransmissionDescriptionSubmarineTransmissionOverheadTransmissionConceptual DesignPage 18McMillen, LLC July 2014
ChugachElectricAssociation,Inc.AttachmentCFourthofJulyandGodwinCreekHydroelectricProjectUnit UnitCost Qty Total1 McMillenTot.CommentsLS $71,000 1 $71,000FromoriginalGraceLakeEstimateon3MWconnectionLS $309,000 1 $309,000Scaledupto19.1MW592=3MWthen19.1MW=$3.7millionCarrierCommunicationsEquipmentLS $212,000 1 $212,000Total$592,000 $592,000.00 SubstationConditionsneedtobedefinedbyChugachSubTotal4thofJuly&GodwinCreekInterconnectionDescriptionSitePrep/EquipmentSwitchgearandSwitchyardConceptual DesignPage 19McMillen, LLC July 2014
Godwin Creek Generation Model, Seward AlaskaProposed Design (Simplified Method)Given:Gross Head 295 feet Based on McMillen 2014 DesignNet Head 284 feet Powerhouse located at approximately 120 m.s.lFlow (best) 308 cfs Estimated from Gaging station at Wolverine Creek (20% exceedance)Average flow 133 cfs Average flow per 12 month calendar cycle Avoided cost 0.090$ Per kw/Hour - Industrial Rate for Chugach 2014 Hydropower Est. Head Flow Eff. Name plateGraphConversionEstimate284 308 0.07 6123 kW 5500 kW1 M3/sec = 35 CFS1 Meter = 3.28 FeetGraph bywww.vatech-hydro.comSummary:The name plate for this system would range from 5.5 MW to 6.1 MW. Name plate unit size around 6.1 MW Per the VA TECH graph, this proposed turbine will be a horizontal Francis Unit.This estimate does not include capital cost to build a power plant or cost of transmission to a interconnect.Statement: Information in this spreadsheet is based on given values as provided by the references. Data has not been confirmed.Revised:Loren Jalbert Date: 7/8/2014Constant FlowcfsFlowm3/sHeadft.Headmȡ kg/m3gm/sec2Ș% efficientP wattsPkilowattsKilowattHours DailyMW-hrs/YearRate Est.Cent/KwhDaily RevenueYearlyRevenueMaintenanceFactor90%3088.7195284 86.56 1000 9.81 75 5553339 5,553 133,280 48,647 0.090$11,995 $4,378,252 $3,940,427Capacity Factor*Capacity *KilowattHours DailyKilowatt Hour Daily/WCapacity FactorRate Est.Cent/KwhDaily RevenueYearlyRevenueMaintenanceFactor90%Estimate of hydropower generation for Godwin Creek based on Capacity Factor0.45133,280 59,976 0.090$5,398 $1,970,213 $1,773,192*Average Capacity factor is 0.45 for the State of Alaska - Per Alaska Business Monthly January 2014http://www.akbizmag.com/Alaska-Business-Monthly/January-2014/New-tables-show-monthly-generator-capacity-factor-data-by-fuel-and-technologyChugach Electric Association, Inc McMillen, LLCAttachment DFourth of July and Godwin Creek Hydroelectric ProjectConceptual DesignPage 1July 2014
4th of July Generation Model, Seward AlaskaCurrent Design (Simplified Method)Given:Gross Head 670 feet Based on McMillen 2014 DesignNet Head 637 feet Powerhouse located at approximately 120 m.s.lFlow (best) 147 cfs Estimated from Gaging station at Spruce Creek (20% exceedance)Average flow 81 cfs Average flow per 12 month calendar cycle Avoided cost 0.090$ Per kw/Hour - Industrial Rate for Chugach 2014 Hydropower Est. Head Flow Eff. Name plateGraphConversionEstimate 637 147 0.07 6555 kW 5945 MW1 M3/sec = 35 CFS1 Meter = 3.28 FeetGraph bywww.vatech-hydro.comSummary:The name plate for this system would range from 5.9 MW to 6.5 MW. Name Plate unit size around 6.6 MW Per the VA TECH graph, this proposed turbine will be a horizontal Francis Unit.This estimate does not include capital cost to build a power plant or cost of transmission to a interconnect.Statement: Information in this spreadsheet is based on given values as provided by the references. Data has not been confirmed.Revised:Loren JalbertDate:7/8/2014Constant FlowcfsFlowm3/sHeadft.Headmȡ kg/m3gm/sec2Ș% efficientPwattsPkilowattsKilowattHours DailyMW-hrs/YearRate Est. Cent/KwhDaily RevenueYearlyRevenueMaintenanceFactor 90%1474.1616637 194.2 1000 9.81 75 5944863 5,945 142,677 52,077 0.090$12,841 $4,686,930 $4,218,237Capacity Factor*Capacity *KilowattHours DailyKilowatt Hour Daily/WCapacityFactorRate Est.Cent/KwhDaily RevenueYearlyRevenueMaintenanceFactor 90%Estimate of hydropower generation for 4th of July Creek based on Capacity Factor0.45142,677 64,205 0.090$5,778 $2,109,119 $1,898,207*Average Capacity factor is 0.45 for the State of Alaska - Per Alaska Business Monthly January 2014http://www.akbizmag.com/Alaska-Business-Monthly/January-2014/New-tables-show-monthly-generator-capacity-factor-data-by-fuel-and-technology/Chugach Electric Association, Inc McMillen, LLCAttachment DFourth of July and Godwin Creek Hydroelectric ProjectConceptual DesignPage 2July 2014
TECHNICAL MEMORANDUM 004
McMillen, LLC Page 1 Chugach Electric
August 29, 2014
To: Dustin Highers
Chugach Electric Association
Project: Fourth of July Hydro, Phase II
Permitting
From: Kathryn Peltier
McMillen, LLC
Cc: Steve Padula, Loren Jalbert, Chris
Runyan - McMillen, LLC
Paul Risse, Kathryn Linn –
Chugach Electric Association
Date: August 29, 2014 Contract:
PO No:
52181
53448
Subject: McMillen’s responses to Chugach’s requests on the 8/19/2014 conference call.
Introduction
The proposed conceptual engineering approach to construct the Fourth of July Creek Project
(Project) is based on the May 29, 2014 site reconnaissance; completed by Chugach Electric
Association, Inc. (Chugach) and McMillen, LLC personnel. A Conceptual Design Report and
associated cost estimate outlining the major features for the Project was submitted to Chugach on
July 9, 2014.
The Project includes the development of two independent hydropower systems utilizing water
from Godwin Creek and Fourth of July Creek each of which is composed of a separate intake,
penstock, and turbine package. The penstock transporting water from Fourth of July Creek will
require a tunnel to provide access through terrain that has significant access issues due to
topography and snow. Common features of the Project include a common access road and bridge
(4,300 feet in length, with 200 foot span bridge length) from a location south of the neighboring
Spring Creek Correctional Center, approximately 10,900 feet transmission line (rated 69 kV) with
switchyard and substation interconnection; and a single powerhouse building with tailrace.
Based on its review of the Conceptual Design Report, Chugach has requested an additional cost
estimate for constructing the Project in two major phases; constructing Fourth of July Creek
development first and Godwin Creek development at a later date, and constructing Godwin Creek
development first and Fourth of July Creek development at a later date. Chugach also requested
rationale for why it would not be feasible to join the independent penstocks into a single source of
generation water prior to entering the powerhouse.
Constructing in Two Major Phases
Cost estimates to construct the Project in two major phases are included in Attachments A and B.
Attachment A reflects constructing the Fourth of July Creek development prior to the Godwin
Creek development. Attachment B reflects constructing the Godwin Creek development prior to
the Fourth of July Creek development. The first phase in each scenario includes the construction
McMillen, LLC Page 2 Chugach Electric
August 29, 2014
of access roads and the bridge over Godwin Creek, the powerhouse, the switchyard, and the
transmission line. The table below compares cost related to each option.
ConstructingFourthofJuly
DevelopmentFirst
ConstructingGodwin
DevelopmentFirstConcurrent
Development
Construction
Phase1Phase2Phase1Phase2
FourthofJuly
Development
Godwin
Development
Godwin
Development
FourthofJuly
Development
$90,281,952$43,508,977$53,601,445$80,189,484
$125,656,263
Project
Total$133,790,929$133,790,929
The estimated cost of constructing the Project in two distinct phases is $8,134,666 more than
constructing the entire project at one time. This increase in cost primarily reflects the need for two
separate site mobilizations, demobilizations, and overhead.
Joining the Penstocks
Under the current design concept the Project will include two penstocks diverting flow from Fourth
of July Creek and Godwin Creek and continuing the separation of water into a single powerhouse.
Chugach has requested McMillen to provide information supporting the need for two separate
penstocks extending from the separate intakes all the way to the powerhouse rather than joining
them upstream of the powerhouse into a single conduit.
The primary reason that the penstocks cannot be combined into a single water conduit is due to
the differing hydraulic and hydrology characteristics of each creek. Each creek has a unique
elevation, location and relative size of proposed intake, diameter and overland routing of the
penstock, and the final configuration of the turbine generator package as designed for the net
elevation head and flow conditions. At the powerhouse each turbine will have a different
configuration, shaft diameter, and RPM rating. Keeping the penstocks separate allows for a wider
operational range across the two turbines. This includes generating electricity from one turbine
while the other turbine is down for maintenance; shutting down one turbine when electrical
demand load is low; ramping up both units to meet peak loads; and allowing for a greater utilization
range that reduces cavitation for two units versus a single unit with a common penstock.
.
Attachment A:
Summary estimates for constructing the Fourth of July Creek development prior to the
Godwin Creek development.
Tunnel/RofR4thofJuly4th of July Creek Project History & Description:Engineer'sEstimateFourthofJulyCreekͲ2014NewProjectDetails:NTSMobilize:Mobilizationofequipment,materialsandlabortoSewardfromeitherAnchorageorSeattle(viabarge).OverheadItems:TemporarymanͲcamp,rentalonheavyandsupportequipment,fuel,maintenance,etcfor3years.AccesstoSite:Approximately4,300feetofnewroadfromeastoftheStateprisontoPowerhouselocationabovealderbrush.NewbridgetocrossGodwinCreek,~200feetinlength,locatedabovehighwatermarktoavoiddebrisflows.Tunnel&Dam:Nodamoneither4thofJulyorGodwinCreekduetohighintermittentdebrisloadsinstream(s).TunnelwillextendfromJulyintake.Tunnelwillbeapproximately16feetindiameter(horseshoeportal).Penstock:4thJulyͲ147CFS(20%exceedance)through4.5'diametersteelpenstockͲ5,100feetlengthIntake:ConcreteIntakeon4thJulyCreekwithsilttraps.SubmitFERCapplicationtoreflectnewapplicantTrashrackonintakestobyͲpasslargediameterrocks,andwoodydebris.Powerhouse:StandardfordesignwithlimitedsiteinformationSwitchYard:Switchyardfor69kV.SwitchyardlocatedatthePowerplantsite.TailRace:DischargetailwaterintotheFourthofJulyCreekatelevationof120feet.Dischargechannelis130feetinlengthNamePlateofNewMW: 6.8 MWTransmission&Interconnection:Overheadtransmissionlinefrompowerplant10,900feettoSubstation.4thofJulyEngineering&PermittingͲ15% $8,207,450Lat. 60.098543 Long. -149.299714Task Order 14005Construction Schematic Site CoordinatesClientChugachElectricCreatedLJDate9/3/2014CheckedMEDateTaskCivilEngineering&ConstructionReviewSheet1REVProject4thofJulyCreekHydropowerSiteEvaluationThissitewasoriginallyexaminedbyaprivateenergydeveloperin2008Ͳ09.Perthe2009feasibilitystudy,onlythe4thofJulyCreekwasconsideredforhydropowerdevelopment(GodwinCreekwasnotincludedinthisfeasibilitystudy).Keyparametersfromthe2009studyincludedanintakestructureonthe4thofJulyCreekat790feetm.s.l.The2009feasibilitystudydesignincludedtheintakeaspartofa14to40foothighdam(finaldamheightwasnotdeterminedin2009).Twoseparate48”diameterpenstockrouteswereidentified.Routingoptionswerebasedontopographyconstraints&bedrock.A5.4MWpowerhousewasproposedatafinalelevationof120feetm.s.l.withanetheadof676feetbasedonaflowof120cfs.Tailwaterwastobedirectedtothe4thofJulystreambed.[Ref:IndependencePowerLLC,November2009,“FourthofJulyCreekHydroelectricProjectReconnaissanceStudyandFeasibilityAssessment”].Perthe2014McMillensiteinvestigation,observedfeaturesofbothGodwinand4thofJulyCreekincludedhighsediment/siltloads,largediameterwoodydebrisinthestreambed,andawidebraidingchannelgeomorphology.Hydrologyrecordsfrom2008Ͳ09indicatesfive(5)floodingeventsexceeding350+cfsflowandoneeventover500cfs.In2014,constructionaccesstothissiteisproposedalongthenorthernsideofGodwinCreek(throughmaturevegetation),withonehighelevationbridgecrossingGodwinCreek.Transmissionisdirectlyrouteddownthecenterofthe4thofJulyvalleytotheCityofSewardIndustrialParksubstation.AMcMillendesignincludesintakesonbothGodwinand4thofJulyCreek,foracombined12.8MWpowerhousedesign.1ConstructionItemConstructionEstimateSept2014Mobilize$385,452FourthofJulyCreek2014ProjectFeaturesOnlywiththeintenttobuildGodwinCreekProjectfeaturesatalaterdateStandardMobfromAnchorage/bargematerialstoSewardfromSeattleAccessRoads$1,363,891DamandSpillway$0Demobilize$123,734TheFourthofJulyCreekcostestimateassumesconstructionoftheFourthofJulyCreekhydropowerplantasaseparateconstructioneffortfromafutureGodwinCreekHydropowerPlant.Thisestimateassumestwoyearsofconstruction,withpossibleshutdowninwinter,howeverfeaturessuchasthetunnelandpowerhousecancontinue.Commonfeaturesthatwouldbebuiltforbothhydropowerprojectsincludetheaccessroad,bridge,oversizedpowerhouse(forsecondgenerator),tailrace,switchyard,transmission,andsubstation.SpecificfeaturestotheFourthofJulywillincludethetunnel,intake,penstockrouting,andaPeltongenerator.Overheads$6,398,292TunnelfromIntaketoabovepowerhouse$22,246,630Powerhouse$13,146,480SwitchYard$2,090,000PenstockfromGodwinCreek$0Intakeson4thofJulyCreek$980,000Penstockfrom4thofJulyCreek$5,319,100TailRace$204,750Estimate69kVlinetoexistingsubstationlocatedSWofPrisonInterconnection$592,000Warehouse&Shop$0Transmission$1,866,006TailracedivertedbackintoFourthofJulyCreekWarehouseandShopbuildingatPowerhouseSiteundermobilization10,900feetor~2milesof69.5kVlinefromPowerhousetoexistingSubstationConnectionatSubstationatSewardIndustrialYard/SWfromPrisonRegulatory&AgencyConsultation5%$2,735,817Subtotal$54,716,334AlaskaRatesContractorProfitͲ15% $8,207,450StandardforAlaska4thJulyͲNetheadof668feetby147CFSͲ6.8MWNameplateͲSeparateturbineConceptLevelContingencyͲ30%$16,414,900Total:$90,281,951ExistingSubstationlocatedatFourthofJulyCreekIndustrialParknearsaltwater.Equipment/Rentals/Templaydownfor2to3yearsofworkStandarddemobolizationoffsite4,300feetwithoneoverheadbridge165feetNodamsorstorageattheFourthofJulyCreekComplexTunnel~3,460feet16'diameter/horseshoe/becomespermanentroadtointake5,200feetof4.5'diametersteelpenstockfromCreektoPowerhouseIntakeon4thofJulyCreekCommonBuildingwithtwoturbinesratedat6.8MWforJulyat6.0MWatGodwinN
RunofRiverGodwinCreek4th of July Creek Project History & Description:Engineer'sEstimateGodwinCreekͲ2014NewProjectDetails:NTSMobilize:Mobilizationofequipment,materialsandlabortoSewardfromeitherAnchorageorSeattle(viabarge).OverheadItems:TemporarymanͲcamp,rentalonheavyandsupportequipment,fuel,maintenance,etcfor3years.AccesstoSite:Approximately4,300feetofnewroadfromeastoftheStateprisontoPowerhouselocationabovealderbrush.NewbridgetocrossGodwinCreek,~200feetinlength,locatedabovehighwatermarktoavoiddebrisflows.Tunnel&Dam:Nodamoneither4thofJulyorGodwinCreekduetohighintermittentdebrisloadsinstream(s).Penstock:GodwinͲ308CFS(20%exceedance)through6.5'diametersteel/HDPEpenstockͲ3,500feetlengthIntake:ConcreteIntakeonGodwinCreekwithsilttraps.SubmitFERCapplicationtoreflectnewapplicantTrashrackonintakestobyͲpasslargediameterrocks,andwoodydebris.Powerhouse:StandardfordesignwithlimitedsiteinformationSwitchYard:Switchyardfor69kV.SwitchyardlocatedatthePowerplantsite.TailRace:DischargetailwaterintotheFourthofJulyCreekatelevationof120feet.Dischargechannelis130feetinlengthNamePlateofNewMW: 6.0 MWTransmission&Interconnection:Overheadtransmissionlinefrompowerplant10,900feettoSubstation.4thofJulyEquipment/Rentals/Templaydownfor2to3yearsofworkStandarddemobolizationoffsite4,300feetwithoneoverheadbridge165feetNodamsorstorageattheFourthofJulyCreekComplexNotunnelatGodwinCreekNoPenstockfrom4thofJuly3,500feetof6.5'diameterofabovegroundsteelpenstocktopowerhouseIntakeonGodwinCreekAccessRoads$0DamandSpillway$0ClientChugachElectricDateTotal:$43,508,977ExistingSubstationlocatedatFourthofJulyCreekIndustrialParknearsaltwater.ConceptLevelContingencyͲ30%$7,910,723ContractorProfitͲ15%$3,955,362StandardforAlaskaGodwinͲNetheadof280feetby308CFSͲ6.0MWNameplateͲSeparateturbinefrom4thofJuly.AlaskaRatesRegulatory&AgencyConsultation5%$1,318,454Engineering&PermittingͲ15%$3,955,362ConnectionatSubstationatSewardIndustrialYard/SWfromPrisonInterconnection$0Subtotal$26,369,077TailRace$0Estimate69kVlinetoexistingsubstationlocatedSWofPrisonWarehouse&Shop$0Transmission$0TailracedivertedbackintoFourthofJulyCreekWarehouseandShopbuildingatPowerhouseSiteundermobilization10,900feetor~2milesof69.5kVlinefromPowerhousetoexistingSubstationPowerhouse$11,833,100SwitchYard$0PenstockfromGodwinCreek$6,648,500IntakesonGodwinCreek$980,000Penstockfrom4thofJulyCreek$0CommonBuildingwithtwoturbinesratedat6.8MWforJulyat6.0MWatGodwinDemobilize$123,734TheGodwinCreekcostestimateassumesconstructionoftheGodwinCreekhydropowerplantasaseparateeffortfromtheconstructionofafutureFourthofJulyCreekHydropowerPlant.Thisestimateassumestwoyearsofconstruction,withpossibleshutdowninwinter.Commonfeaturesthatwouldbebuiltforbothhydropowerprojectsincludetheaccessroad,bridge,oversizedpowerhouse(forsecondgenerator),tailrace,switchyard,transmission,andsubstation.SpecificfeaturestotheGodwinCreekhydropowerprojectincludetheintake,penstockrouting,andaFrancisgenerator.Overheads$6,398,292TunnelfromIntaketoabovepowerhouse$0Mobilize$385,452GodwinCreek2014ProjectFeaturesOnly;AFTERFourthofJulyCreekProjectFeaturesareconstructedStandardMobfromAnchorage/bargematerialstoSewardfromSeattleConstructionItemConstructionEstimateSept2014Thissitewasoriginallyexaminedbyaprivateenergydeveloperin2008Ͳ09.Perthe2009feasibilitystudy,onlythe4thofJulyCreekwasconsideredforhydropowerdevelopment(GodwinCreekwasnotincludedinthisfeasibilitystudy).Keyparametersfromthe2009studyincludedanintakestructureonthe4thofJulyCreekat790feetm.s.l.The2009feasibilitystudydesignincludedtheintakeaspartofa14to40foothighdam(finaldamheightwasnotdeterminedin2009).Twoseparate48”diameterpenstockrouteswereidentified.Routingoptionswerebasedontopographyconstraints&bedrock.A5.4MWpowerhousewasproposedatafinalelevationof120feetm.s.l.withanetheadof676feetbasedonaflowof120cfs.Tailwaterwastobedirectedtothe4thofJulystreambed.[Ref:IndependencePowerLLC,November2009,“FourthofJulyCreekHydroelectricProjectReconnaissanceStudyandFeasibilityAssessment”].Perthe2014McMillensiteinvestigation,observedfeaturesofbothGodwinand4thofJulyCreekincludedhighsediment/siltloads,largediameterwoodydebrisinthestreambed,andawidebraidingchannelgeomorphology.Hydrologyrecordsfrom2008Ͳ09indicatesfive(5)floodingeventsexceeding350+cfsflowandoneeventover500cfs.In2014,constructionaccesstothissiteisproposedalongthenorthernsideofGodwinCreek(throughmaturevegetation),withonehighelevationbridgecrossingGodwinCreek.Transmissionisdirectlyrouteddownthecenterofthe4thofJulyvalleytotheCityofSewardIndustrialParksubstation.AMcMillendesignincludesintakesonbothGodwinand4thofJulyCreek,foracombined12.8MWpowerhousedesign.1TaskCivilEngineering&ConstructionReviewSheet1REVProjectGodwinCreekHydropowerSiteEvaluationLat. 60.098543 Long. -149.299714Task Order 14005CheckedMEConstruction Schematic Site CoordinatesCreatedLJDate9/3/2014N
Attachment B:
Summary estimate for constructing the Godwin Creek development prior to the Fourth of
July Creek development
RunofRiverGodwinCreek4th of July Creek Project History & Description:Engineer'sEstimateGodwinCreekͲ2014NewProjectDetails:NTSMobilize:Mobilizationofequipment,materialsandlabortoSewardfromeitherAnchorageorSeattle(viabarge).OverheadItems:TemporarymanͲcamp,rentalonheavyandsupportequipment,fuel,maintenance,etcfor3years.AccesstoSite:Approximately4,300feetofnewroadfromeastoftheStateprisontoPowerhouselocationabovealderbrush.NewbridgetocrossGodwinCreek,~200feetinlength,locatedabovehighwatermarktoavoiddebrisflows.Tunnel&Dam:Nodamoneither4thofJulyorGodwinCreekduetohighintermittentdebrisloadsinstream(s).Penstock:GodwinͲ308CFS(20%exceedance)through6.5'diametersteel/HDPEpenstockͲ3,500feetlengthIntake:ConcreteIntakeonGodwinCreekwithsilttraps.SubmitFERCapplicationtoreflectnewapplicantTrashrackonintakestobyͲpasslargediameterrocks,andwoodydebris.Powerhouse:StandardfordesignwithlimitedsiteinformationSwitchYard:Switchyardfor69kV.SwitchyardlocatedatthePowerplantsite.TailRace:DischargetailwaterintotheFourthofJulyCreekatelevationof120feet.Dischargechannelis130feetinlengthNamePlateofNewMW: 6.0 MWTransmission&Interconnection:Overheadtransmissionlinefrompowerplant10,900feettoSubstation.Construction Schematic Site CoordinatesCreatedLJDate9/3/2014Lat. 60.098543 Long. -149.299714Task Order 14005CheckedMETaskCivilEngineering&ConstructionReviewSheet1REVProjectGodwinCreekHydropowerSiteEvaluationThissitewasoriginallyexaminedbyaprivateenergydeveloperin2008Ͳ09.Perthe2009feasibilitystudy,onlythe4thofJulyCreekwasconsideredforhydropowerdevelopment(GodwinCreekwasnotincludedinthisfeasibilitystudy).Keyparametersfromthe2009studyincludedanintakestructureonthe4thofJulyCreekat790feetm.s.l.The2009feasibilitystudydesignincludedtheintakeaspartofa14to40foothighdam(finaldamheightwasnotdeterminedin2009).Twoseparate48”diameterpenstockrouteswereidentified.Routingoptionswerebasedontopographyconstraints&bedrock.A5.4MWpowerhousewasproposedatafinalelevationof120feetm.s.l.withanetheadof676feetbasedonaflowof120cfs.Tailwaterwastobedirectedtothe4thofJulystreambed.[Ref:IndependencePowerLLC,November2009,“FourthofJulyCreekHydroelectricProjectReconnaissanceStudyandFeasibilityAssessment”].Perthe2014McMillensiteinvestigation,observedfeaturesofbothGodwinand4thofJulyCreekincludedhighsediment/siltloads,largediameterwoodydebrisinthestreambed,andawidebraidingchannelgeomorphology.Hydrologyrecordsfrom2008Ͳ09indicatesfive(5)floodingeventsexceeding350+cfsflowandoneeventover500cfs.In2014,constructionaccesstothissiteisproposedalongthenorthernsideofGodwinCreek(throughmaturevegetation),withonehighelevationbridgecrossingGodwinCreek.Transmissionisdirectlyrouteddownthecenterofthe4thofJulyvalleytotheCityofSewardIndustrialParksubstation.AMcMillendesignincludesintakesonbothGodwinand4thofJulyCreek,foracombined12.8MWpowerhousedesign.1ConstructionItemConstructionEstimateSept2014Mobilize$385,452GodwinCreek2014ProjectFeaturesOnlywiththeintenttobuildFourthofJulyCreekProjectfeaturesatalaterdateStandardMobfromAnchorage/bargematerialstoSewardfromSeattleDemobilize$123,734TheGodwinCreekcostestimateassumesconstructionoftheGodwinCreekhydropowerplantasaseparateeffortfromtheconstructionofafutureFourthofJulyCreekHydropowerPlant.Thisestimateassumestwoyearsofconstruction,withpossibleshutdowninwinter.Commonfeaturesthatwouldbebuiltforbothhydropowerprojectsincludetheaccessroad,bridge,oversizedpowerhouse(forsecondgenerator),tailrace,switchyard,transmission,andsubstation.SpecificfeaturestotheGodwinCreekhydropowerprojectincludetheintake,penstockrouting,andaFrancisgenerator.Overheads$6,398,292TunnelfromIntaketoabovepowerhouse$0Powerhouse$11,833,100SwitchYard$2,090,000PenstockfromGodwinCreek$6,648,500IntakesonGodwinCreek$980,000Penstockfrom4thofJulyCreek$0CommonBuildingwithtwoturbinesratedat6.8MWforJulyat6.0MWatGodwinTailRace$204,750Estimate69kVlinetoexistingsubstationlocatedSWofPrisonWarehouse&Shop$0Transmission$1,866,006TailracedivertedbackintoFourthofJulyCreekWarehouseandShopbuildingatPowerhouseSiteundermobilization10,900feetor~2milesof69.5kVlinefromPowerhousetoexistingSubstationConnectionatSubstationatSewardIndustrialYard/SWfromPrisonInterconnection$592,000Subtotal$32,485,724AlaskaRatesRegulatory&AgencyConsultation5%$1,624,286Engineering&PermittingͲ15%$4,872,859ContractorProfitͲ15%$4,872,859StandardforAlaskaGodwinͲNetheadof280feetby308CFSͲ6.0MWNameplateͲSeparateturbinefrom4thofJuly.ConceptLevelContingencyͲ30%$9,745,717Total:$53,601,445ExistingSubstationlocatedatFourthofJulyCreekIndustrialParknearsaltwater.4thofJulyEquipment/Rentals/Templaydownfor2to3yearsofworkStandarddemobolizationoffsite4,300feetwithoneoverheadbridge165feetNodamsorstorageattheFourthofJulyCreekComplexNotunnelatGodwinCreekNoPenstockfrom4thofJuly3,500feetof6.5'diameterofabovegroundsteelpenstocktopowerhouseIntakeonGodwinCreekAccessRoads$1,363,891DamandSpillway$0ClientChugachElectricDateN
Tunnel/RofR4thofJuly4th of July Creek Project History & Description:Engineer'sEstimateFourthofJulyCreekͲ2014NewProjectDetails:NTSMobilize:Mobilizationofequipment,materialsandlabortoSewardfromeitherAnchorageorSeattle(viabarge).OverheadItems:TemporarymanͲcamp,rentalonheavyandsupportequipment,fuel,maintenance,etcfor3years.AccesstoSite:Approximately4,300feetofnewroadfromeastoftheStateprisontoPowerhouselocationabovealderbrush.NewbridgetocrossGodwinCreek,~200feetinlength,locatedabovehighwatermarktoavoiddebrisflows.Tunnel&Dam:Nodamoneither4thofJulyorGodwinCreekduetohighintermittentdebrisloadsinstream(s).TunnelwillextendfromJulyintake.Tunnelwillbeapproximately16feetindiameter(horseshoeportal).Penstock:4thJulyͲ147CFS(20%exceedance)through4.5'diametersteelpenstockͲ5,100feetlengthIntake:ConcreteIntakeon4thJulyCreekwithsilttraps.SubmitFERCapplicationtoreflectnewapplicantTrashrackonintakestobyͲpasslargediameterrocks,andwoodydebris.Powerhouse:StandardfordesignwithlimitedsiteinformationSwitchYard:Switchyardfor69kV.SwitchyardlocatedatthePowerplantsite.TailRace:DischargetailwaterintotheFourthofJulyCreekatelevationof120feet.Dischargechannelis130feetinlengthNamePlateofNewMW: 6.8 MWTransmission&Interconnection:Overheadtransmissionlinefrompowerplant10,900feettoSubstation.Equipment/Rentals/Templaydownfor2to3yearsofworkStandarddemobolizationoffsite4,300feetwithoneoverheadbridge165feetNodamsorstorageattheFourthofJulyCreekComplexTunnel~3,460feet16'diameter/horseshoe/becomespermanentroadtointake5,200feetof4.5'diametersteelpenstockfromCreektoPowerhouseIntakeon4thofJulyCreekCommonBuildingwithtwoturbinesratedat6.8MWforJulyat6.0MWatGodwinTotal:$80,189,484ExistingSubstationlocatedatFourthofJulyCreekIndustrialParknearsaltwater.ConceptLevelContingencyͲ30%$14,579,906ContractorProfitͲ15%$7,289,953StandardforAlaska4thJulyͲNetheadof668feetby147CFSͲ6.8MWNameplateͲSeparateturbineAlaskaRatesRegulatory&AgencyConsultation5%$2,429,984Subtotal$48,599,687Interconnection $0Warehouse&Shop$0Transmission$0TailracedivertedbackintoFourthofJulyCreekWarehouseandShopbuildingatPowerhouseSiteundermobilization10,900feetor~2milesof69.5kVlinefromPowerhousetoexistingSubstationConnectionatSubstationatSewardIndustrialYard/SWfromPrisonTailRace$0Estimate69kVlinetoexistingsubstationlocatedSWofPrisonPowerhouse$13,146,480SwitchYard$0PenstockfromGodwinCreek$0Intakeson4thofJulyCreek$980,000Penstockfrom4thofJulyCreek$5,319,100AccessRoads$0DamandSpillway$0Demobilize$123,734TheFourthofJulyCreekcostestimateassumesconstructionoftheFourthofJulyCreekhydropowerplantasaseparateconstructioneffortfromafutureGodwinCreekHydropowerPlant.Thisestimateassumestwoyearsofconstruction,withpossibleshutdowninwinter,howeverfeaturessuchasthetunnelandpowerhousecancontinue.Commonfeaturesthatwouldbebuiltforbothhydropowerprojectsincludetheaccessroad,bridge,oversizedpowerhouse(forsecondgenerator),tailrace,switchyard,transmission,andsubstation.SpecificfeaturestotheFourthofJulywillincludethetunnel,intake,penstockrouting,andaPeltongenerator.Overheads$6,398,292TunnelfromIntaketoabovepowerhouse$22,246,630Mobilize$385,452FourthofJulyCreek2014ProjectFeaturesOnly;AFTERGodwinCreekProjectFeatureshavebeenconstructedStandardMobfromAnchorage/bargematerialstoSewardfromSeattleConstructionItemConstructionEstimateSept2014Thissitewasoriginallyexaminedbyaprivateenergydeveloperin2008Ͳ09.Perthe2009feasibilitystudy,onlythe4thofJulyCreekwasconsideredforhydropowerdevelopment(GodwinCreekwasnotincludedinthisfeasibilitystudy).Keyparametersfromthe2009studyincludedanintakestructureonthe4thofJulyCreekat790feetm.s.l.The2009feasibilitystudydesignincludedtheintakeaspartofa14to40foothighdam(finaldamheightwasnotdeterminedin2009).Twoseparate48”diameterpenstockrouteswereidentified.Routingoptionswerebasedontopographyconstraints&bedrock.A5.4MWpowerhousewasproposedatafinalelevationof120feetm.s.l.withanetheadof676feetbasedonaflowof120cfs.Tailwaterwastobedirectedtothe4thofJulystreambed.[Ref:IndependencePowerLLC,November2009,“FourthofJulyCreekHydroelectricProjectReconnaissanceStudyandFeasibilityAssessment”].Perthe2014McMillensiteinvestigation,observedfeaturesofbothGodwinand4thofJulyCreekincludedhighsediment/siltloads,largediameterwoodydebrisinthestreambed,andawidebraidingchannelgeomorphology.Hydrologyrecordsfrom2008Ͳ09indicatesfive(5)floodingeventsexceeding350+cfsflowandoneeventover500cfs.In2014,constructionaccesstothissiteisproposedalongthenorthernsideofGodwinCreek(throughmaturevegetation),withonehighelevationbridgecrossingGodwinCreek.Transmissionisdirectlyrouteddownthecenterofthe4thofJulyvalleytotheCityofSewardIndustrialParksubstation.AMcMillendesignincludesintakesonbothGodwinand4thofJulyCreek,foracombined12.8MWpowerhousedesign.1TaskCivilEngineering&ConstructionReviewSheet1REVProject4thofJulyCreekHydropowerSiteEvaluationCheckedMEDate4thofJulyEngineering&PermittingͲ15% $7,289,953Lat. 60.098543 Long. -149.299714Task Order 14005Construction Schematic Site CoordinatesClientChugachElectricCreatedLJDate9/3/2014N
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NMFS Critical Habitat Report
Area of Interest (AOI) Information
Area : 26.33 km²
Nov 29 2022 12:32:38 Pacific Standard Time
11/29/22, 12:28 PMCritical Habitat for Threatened & Endangered Species [USFWS]https://fws.maps.arcgis.com/home/webmap/print.html1/1U.S. Fish and Wildlife Service | Esri, HERE, Garmin, USGS, METI/NASA, EPA, USDACritical Habitat for Threatened & Endangered Species [USFWS]A specific geographic area(s) that contains features essential for the conservation of a threatened or endangered speciesand that may require special management and protection.Final Polygon FeaturesFinal Linear FeaturesProposed PolygonFeaturesProposed Linear Features0.3mi
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Godwin CreekU.S. Fish and Wildlife Service, National Standards and Support Team,wetlands_team@fws.govWetlandsEstuarine and Marine DeepwaterEstuarine and Marine WetlandFreshwater Emergent WetlandFreshwater Forested/Shrub WetlandFreshwater PondLakeOtherRiverineNovember 29, 20220120.5 mi01.530.75km1:60,187This page was produced by the NWI mapperNational Wetlands Inventory (NWI)This map is for general reference only. The US Fish and Wildlife Service is not responsible for the accuracy or currentness of the base data shown on this map. All wetlands related data should be used in accordance with the layer metadata found on the Wetlands Mapper web site.