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lMJ£0072&, 0 §ffi1&~©@ Susitna Joint Venture :J 7BZ Please Return To DOCUMENT CONTROL r 1 J t 1 --nnrn r lMnru ALL\SKA PDNER AUTHORITY SUSITNA HYDROELECTRIC PROJECT TASK 6 -DESIGN DEVELOPMENT SUBTASK 6401 ~ CLOSEOUT REPORT REVIE\~ OF PREVIOUS STUDIES AND REPORTS FEBRUARY 1981 Acres American lnc;o.rgorated 1000 Uberty Bank BuHd!.ng Main at Court Buffalo, New York 14202 Telephone (716) 853-7525 ALASKA POHER AUTHORITY SUSITNA HYDROELECTRIC PROJECT TASK 6 -DESIGN DEVELOPMENT SUBTASK 6.01 -CLOSEOUT REPORT REVIEW OF PREVIOUS STUDIES AND REPORTS FEBRUARY 1981 r r ".... i i i. ALASKA POWER AUTHOR ITY SUSITNA HYDROELECTRIC PROJECT TASK 6 -DESIGN DEVELOPMENT SUBTASK 6 .01 .~CLOSEOUT REPORT REVIEW OF PREVIOUS STUDIES AND REPORTS TABLE OF CONTENTS LIST OF TABLES LIST OF FIGURJ:::S ................•'~.. Page iii iv r ! 1 -INTRODUCTION 1.1 -Background ..........•........••....•............•........1.:..1 1.2 ~Report Contents.........................................1-1 2 -SUMMARY 2.1 -Previous Studies •....•....•..............•.... .2-1 2.2 -Design Parameters ........•....•.....•..........•......•.2-2 2.3 -Co s t Co mp ar i son s .................•.............•........2- 2 2.4 -Conclusions.............................................2-2 3.-SCOP E e,,I .. .. .. ...... ........ .. ...... ....3-1 4 -PREVIOUS STUDIES 4.1 -U.S.Bureau of Reclamation -1953 4-1 4.2 -U.S.Bureau of Reclamation -1961 '........4-2 4.3 -Alaska Power Administration -1974 ....••................4-2 4.4 -Kaiser Engineers -1974 4-2 4.5 -Corps of Engineers -1975 ............•...•...•.•........4-3 4.6 -Corps of Engineers -1979 .................•.......•.....4-4 5 -DESIGN PARAMETERS 5,"1 -General ~-.. 5 ..2 -Ci vi 1 '.. 5.3 -Hydrology II ................• ,"".. 5.4 -Geot.·echnical .. 5 ..5 -M.e chan;cal ......................................................................'.. 5 ..6 -Hyd'ro power .. 5.7 -Environmental ...•...........•...•....•.................. 5.8 -Generation Planning ..•........•........••..•...•........ 5-1 5-1 5-4 5-4 5-7 5-8 5-8 5-9 6 -CONSTRUCTION COST INFORMATION 6.1 - Av ail ab 1e Dat a 6-1 6.2 -Basis of Cost Estimates ....•.......•....................6-1 6.3 -Prelimi~ary Ranking of Sites •.•.....•...................6-2 i ,.... ! - - r ! r, r ALASKA POWER AUTHORITY SUSITNA HYDROELECTRIC PROJECT TASK 6 -DES IGN DEVELOPMENT SUBTASK 6.01 -CLOSEOUT REPORT REVIEW OF PREVIOUS STUDIES AND REPORTS TABLE OF CONTENTS (Cant I d) BIBLIOGRAPHY APPENDIX A -PROJECT LAYOUTS B -CORPS OF ENGINEERS (7)CRITERIA FOR EVALUATION OF ALTERNATIVES C -CORPS OF ENGINEERS 1975 INTERIM FEASIBILITY REPORT (7) COST DATA D -CORPS OF ENGINEERS 1979 SUPPLEMENTARY FEASIBILITY REPORT (8)COST DATA AND SCHEDULE ii ,-LI ST OF TABLES Hydrological Parameters.................................2-4 Devil Canyon Project -Denali Dam Mechanical Equipment •••~••••••••••••••••••••.••••••••••••.••••••.•.2-10 I""'" I Number 2.1 2.2 2.3 2.4 2.5 Title Civil Design Parameters ••••••••••••••••••••••••••••••••• Devil Canyon Project -Mechanical Equipment ••••••••••••• Watana Project -Mechanical Equipment ••••••••••••••••••• 2-3 2-6 2-8 - r r r 2.6 2.7 2.8 3.1 4.1 4.2 5.1 5.2 Hydropower Parameters •••••••••••••••••••••••••••••••••••2-11 Upper Susitna Environmental Data Base for Input into the Selection of Development Sites ••••••••••••••••••••••2-13 Cost Comparison •••••••••••••••••••••••••••••••••.•••.•••2-14 Corps of Engineers -Evaluation of Alternatives •••••••••3-2 Corps of Engineers -"Scoping Economic Analysis 'l ••••••••4-5 Corps of Engineers -Data Pertaining to Promising Susitna Developments ••••••••••••••••••••••••••••••••••••4-6 Data Ava.ilable for Alternative Hydroelectric Development Schemes •••.•.•••••..•••••••••••••••.•.••••••5-11 Environmental Ranking of Sites ••••••••••••••••••••••••••5-12 iii ..... LIST OF FIGURES, Number 2.1 r-2.2I 5.1 r i 5.2 - r .- - Title LClcat i on of Dam Sites Proposed by Others ••••••••••••••••2...:15 River Profile through Alternative Sites •••••••••••••••••2-16 Southcentral Railbelt,Loads and Resources - Medium Load Forecast ••.•••.•••••••••.••••••••.••••.•.•••5-13 SCluthcentral Railbelt,loads and Resources - Low Load Forecast ....•..•........•..•.•.....•.....•...•.5-14 iv -I r ~. ,...'t ,.... 1 -INTRODUCTION 1.1 -Background The development of hydropower in the Susitna Basin has been under study for the past 30 years.The objective of Subtask 6.01,as stated in the February 1980 Plan of Study for the Susitna Project is to "Assemble and review all available engineering data,siting,and economic studies relating to the Susitna hydro- power development and .alternative potential sites".Alternative potential sites have been assumed to include only sites in the Susitna River Basin upstream from Gold Creek.For study purposes,this area is referred to as the Upper Susitna River Basin. Other sites and developments both on the lower Susitna and other rivers are included in Subtask 6.33 -Hydroelectric Generation Resources.Collection of geotechnical and hydrological data is dealt with separately in Subtask 5.01 - Data Collection and Review and Subtask 3.01 -Review of Available Material. 1.2 -Report Contents This report contains a brief review of the previous studies pertaining to hydro- electric development in the Upper Susitna River Basin and sumarizes the signifi- cant findings. Section 2 contains a summary of the report and Section 3 outlines the discussion and conclusions.Section 4 outlines the scope of work associated with Subtask 6.01.A chronological review of the previous studies is dealt with in Section 5.Section 6 outlines the civil,hydrological,geotechnical,environmental, hydropower and pl anning parameters associ ated with each of the previously identified sites.Cost comparison between alternatives is given in Section 7. 1-1 -, .~ --[ -,, 2 -SUMMARY 2.1 -Previous Studies The major engineering studies conducted during the past 30 years are briefly discussed below: - A 1953 study by the US Bureau of Reclamation (USSR)(11)identified a total of 10 sites in the Susitna Basin upstream from Gold Creek.Preliminary schemes of development including dam types and heights were presented for seven of the sites.Based on these studies the USSR proposed that the ultimate development consist of dams at Olson,Devil Canyon,Watana,Vee and Denali with a total installed capacity of 1010 MW. -The first stage of this USBR proposal was the subject of the 1961 follow-up study (10)of the Devil Canyon Project.In this study designs for the Devil Canyon Dam and the Denal i Dam were developed.Devi 1 Canyon was to have an installed capacity of 580 MW and Denali was to be used for flow regulation purposes only. In 1974 the Alaska Power Admi ni strat i on,Department of Interi or,issued a report on the status of the Devil Canyon Project (1).This involved an update of information in the 1961 USBR study and included some minor design changes. - A report issued by Kaiser Engineers (4)in 1974 suggested the construction of a dam approximately five miles upstream from the Devil Canyon site known as Susitna I (or High Devil Canyon)as an alternative to the Devil Canyon Project.Unlike Devil Canyon,this site has the advantage that sufficient storage is available for utilization of the maximum power potential without an additional upstream reservoir.Ultimately this scheme called for three other dams to be constructed for full basin development. -To date,the Interim and Supplemental Feasibility Studies by the Corps of Engineers {7,,8}issued in 1975 and 1979 respectively represent the most extensive studies on development of hydropower on the Upper Susitna river. Several different schemes involving six dam sites were considered.A scheme inclUding dams at Watana and Devil Canyon was selected as being the most economical development as well as the best from an environmental viewpoint. It was shown that the Benefit Cost Ratio for this scheme was 1.4 using alternative coal-fired energy to assess project benefits (1979 value). The above studies identified a total of eleven sites upstream from Gold Creek (see Figure 2.1).,Figure 2.2 illustrates the river profile,indicates heights and shows which site would be el iminated by development at other sites. Other studies that have been conducted have dealt more specifically with environmental issues and geotechnical investigations. (1)Indicates the reference number. 2-1 2.2 -Design Parameters The desi gn parameters associ ated with the various developments are di scussed in Section 6.Tables 2.1 to 2.6 summarize the civil,hydrological,mechanical and hydropower parameters contained in the previous studies.Table 2.7 summarizes the environmental data pertaining to various reaches of the'Upper Susitna River.~ 2.3 -Cost Comparisons The following major items were identified in this review of previous studies: The level of detail on the potential development at each site varies signifi- cantly.Standardization of this information and some upgrading of informa- tion pertaining to the less intensively studied sites would facilitate a more formal and convincing site selection study. -The Devil Canyon and Watana sites appear to be the most economic combination. The Devil Canyon site requires upstream regulation for economic power genera- tion. -The Kaiser plan proposed a dam located in the vicinity of Devil Creek (High Devil Canyon).It provides both a high head and storage and consideration should be given to studying it in more detail. The economics of the project as proposed by the Corps of Engineers is very dependent on the assumed rate of retirement of existing plants and,to a lesser degree,on the rate of load growth.The val idity of their assumptions with respect to these aspects should therefore.be carefully reviewed in any further studies. 2-2 !I!II!IIII '1 j J "1 '1 ']...•.-•...]~"l 1 1 1 ."-] TABLE 2~1:CIVIL DESIGN PARAMETERS *Discrepancy probably due to better information in the 1961 study (Denali -2552) than in the 1953 study (Denali -2590) TABLE 2.2:HYDROLOGICAL DESIGN PARAMETERS Site (Pool E1.) Mean Annual Mln.Avg.Max.Avg.Spillway Iri-Flow Monthly In-Monthly In-Design (Ae-ft/year)Flow (Mareh)*flow (June)*flood (efs)(efs)(efs)(efs) Reservoir Stotage lCifiir--·--Usable (Ac-ft)(Ae-ft) Data Sources (Ref.No.) ;~-"-l N I .j::> Gold Creek Olson (920/1020) Devil Canyon (1450) High D.C.(1750) Devil Creek Watana (1905) Watana (2050) Watana (2200) Susitna III Vee (2300) Maclaren Denali (2535) Denali (2552) Denali (2590) 6,965,000 (9620) 6,815,000** (9410) 6,682,000** (9230) 6 617 000**, ,.. (9,140) 6,487,000** (8,960) 5,893,000** (8,160) 5,893,000 (8,160) 5,893,000 (8,160) 4,590,000** (6,350) 4,481,000 (6,190) 3,150,000*** (4,360) 2,386,000*** 0,290) 2,386,000* 0,290) 2,386,ODO 0,290) ,~...._.,..I 710 690 660 650 640 570 570 570 440 430 70 55 55 55 ).~ol 50,580 49,600 47,800 47,600 46,600 42,800 42,800 42,000 35,300 34,630 18,000 14,110 14,110 14,110 "-~"-J 228,000 165,000 ,,-",~J 6,600 1,050,000 4,730,000 2,480,000 5,300,000 9,425,000 1,000,000 210,000 4,250,000 5,400,000 6,700,000 NIL 790,000 3,930,000 2,310,000 4,575,000 8,125,000 820,000 158,000 3,770,000 5,300,000 5,700,000 ._""J USBR (11) u.s.Corps (7) u.s.Corps (7) u.S.Corps (7) u.s.Corps (7) u.s.Corps (7) u.s.Corps (7) USBR (11) u.s.Corps (7) USBR (10) USBR (11) b ..J.J _J J TABLE 2.2:(Continued) -~1 ",'~cl '1 1 ']1 1 c''''],',"']"~']'J "'I Site (Pool £1.) HeailAnn'u'ar M1n:-Avg.Max.Avg.Spil1way In-flow Monthly In-Monthly In-Design (Ae-ft/year)flow (March)*flow (June)*flood (efs)(efs)(efs) (efs) Reservoir ~torage Tot"Eir-'"------usaoIe (Ae-ft)(Ac-ft) Data Sources (Ref.No.) Proration not appropriate Butte Creek lyone (2385) 2,064,000 (2,B50) 222,000 000) 55 12,200 700,000 700,000 USSR (11) N I U'1 ~ lhe mean annual,m1n1mum and maximum average monthly inflows were calculated as part of subtask 6.01 by prorating available streamflow records *Unregulated**Inflows prorated from gaged flow at Gold Creek using drainage basin area ratios. ***Inflows prorated fran gaged flow at Denali using drainage basin area ratios. TABLE 2.3:DEVIL CANYON PROJECT -MECHANICAL EQUIPMENT 1.GENERAL eapac~E~••••••••••••••••• Total Head ••••••••••••••• Powerhouse t~pe •••••••••• Number of units •••••••••• USSR March 1961 (10) 580 MW 530 ft surface 8 Alaska Power Administration May 1974(1) 600 MW 550 ft underground 4 Corps of Engineers 1979(8) 776 MW 520 ft underground 4 2.HYDRAULIC CONDIT IONS Headwater level -maximum •••••••••••••••• -normal ... -minimum . Tailwater level -maximum •••••••••.•••••• -normal ••••••••••••••••• -minimum •••••••••••••••• Gross Head -maximum •••••••••••••••• -minimum •••••••••••••••• Net Head -maximum •••••••••••••••• -rated •••••••••••••••••• -minimum •••••••••••••••• 3.TURBINES T'ype ... Rated power (each)•••••• Rated net head••••••••••• Centerline distributor ••• Submergence (minimum)•.•• 4.GENERATORS type •••••••••••••••••••• Rated power ••••••••••••• 5.POWERHOUSE CRANES T~pe ••••••••••••••••••••• Numbe r '.. Capacity (each)••••••••••• S.psn .. 6.PENSTOCK VALVES Number ••••••••••••••••••• T~pe ••••••••••••••••••••• Diameter ••••••••••••••••• Head to centerline 7.INTAKE GATES Number ••••••••••••••••••• Type ••••••••••••••••••••• Width •••••••••••••••••••• Height ••••••••••••••••••• Head to centerline•••••••• Hoist ••••••••••••••••••••• 8.INTAKE BULKHEAD GATES EL 1455 EL 1455 EL 1455 EL 1450 EL 1450 EL 1275 EL 1275 EL 1275 EL 897 EL 924 EL 924 EL 875 EL 870 EL 878 EL 878 585 ft 577 ft 577 ft 405 ft 351 ft 351 ft 570 ft 530 ft 550 ft 520 ft 395 ft vertical vertical vertical Francis Francis Francis 100,000 hp 205,000 hp 265,000 hp (best gate) 530 ft 550 ft 520 ft EL 881 EL 867 EL 867 -11 ft 11 ft 11 ft vertical vertical vertical s~nchronous synchronous synchoronous 72.5 MW 150 MW 194 MW overhead travelling bridge 2 2 350 tons 235 tons 425 68 ft 72 ft eight none none butterfly 11.5 ft 355 ft 2 4 4 fixed wheel bonneted bonneted fixed wheel fixed wheel 26 ft (approx)15 18 26 ft (approx)15 18 210 feet 588 ft.588 ft. hydraulic hydraulic h~draulic none 3 sets of slots with several sets of stoplogs to premit water to be drawn from various eleva- tions. 2-6 TABLE 2.3;(Continued) USBR March 1961 (10) Alaska Power Ackninistration May 1974(1) Corps of Engineers 1979(8) 9.TRASHRACKS NUm'bea:-.-It . Configuration •.•.•••••••• 2 sloping,semi- circular 2 vertical, semi-vertical 2 vertical, semi-circular 10.DRAFT TUBE GATES Number of openings per turbine •••••••••••••••••• Type of gate ••••••••••••• Handling •••••••••••••••• 11.TAILRACE TUNNEL STOPLOGS Number of openings •••••••• Sill beam •••••••••.•••.•• Stoplog handling •••••••••• 12.SPILLWAY CREST GATES Number •••••••••••••••••. Type •••••••••••••••••••• Width ••••••••••••••••••• Height •••••••••••••••••• Ho ist ••••••••••••••••••• 13.LOW LEVEL OUTLETS (Main Gates) Number •••••••••••••••••• Type •••••••••••••••••••• Width . He ight ••••••••••••••••••• Head to centerline .••••• Hoist .•.•••••••.••••••... 3 2 2 bulkhead bulkhead bulkhead 5 ton cantry powerhouse powerhouse crane outside)crane crane None 2 2 El 850 El 850 2 none 2 radial radial 64 ft (approx) 64 ft.42.5 ft wire rope wire rope none 6 4 vertical bonnetted fixed wheel slide 7.5 11 ft 70 380 ft hydraulic - -, 14.LOW LEVEL OUTLETS (Emergency Gates) Number •••••••••••••••••• Type . 15.LOW LEVEL OUTLET TRASHRAtks 16.OUTLET VALVES Number ••.•••••••••••••••• Type ••••••••••••••••••••• Diameter •••••••••••••••••• Head to centerline •.•.•••• 17.OUTLET VALUE CLOSURE GATE Type ••••••••••••••••••••• Size '0. Head to centerline •••••••• 18.OUTLET VALVE TRASHRACKS Number of sets •.•.••••••• Configuration •••.•.••••••• 19.DIVERSION CLOSURE GATES Num'ber •••••••••••••••••.•• Type ••••••••••.•.••••••••• Width ••••••••••.•••••••••• He ight ••••••••••••.•••••• Head to centerline: -during closure .•.•••••• -after closure •••••••••• none none 1 hollow jet 66 575 ft ring follower gate 66 in. 575 ft. 1 vertical semi-circular 2 vertical 2-7 none none 1 jet flow ring follower gate 1 vertical semi-circular 2 vertical 4 as per main gate none none none 1 set wheeled bulkhead 26 ft 36 ft approx 18 ft approx 594 TABLE 2.4:WATANA PROJECT -MECHANICAL EQUIPMENT Corps of 1.GENERAL Engineers 1979(8) Total Capacity •••••••••••••••••••••••••••••••••••••••••• Head . Powerhouse type •••••••••••••••••••••••••••••••••••••••••• NUnDer of units •••••••••••••••••••••••••••••••••••••••••• 2.HYDRAULIC CONDITIONS Headwater level: m'aximum 0-.. -nortnal . -minimu'm .. Tailwater level: -normal 0-......• '.. Gross head: -rnaximu'm . -minimum . Rated net Head .. 3.TURBINES Type •••••••••••••••••••••••••••••••••••••••••••••••••••• Rat ed powe r (each)•••••••••••••••••••••••••••••••••••••• Rat ed net head -. Centerline distributor •.....•.........•................•• Subrergence (average)'••.•• 4.GENERA TORS 792 MW 580 underground 3 EL 2190 EL 2185 EL 1940 EL 1465 725 ft (approx) 475 ft (approx) 580 ft vertical francis 362,000 hp (best gate) 580 ft. 1460 5 ft. Type '•••••••••••••••••••••••••••\lert ical Rater power..............................................264 MW 5•POWERHOUSE CRANES synchronous NuRtler . Capaci t y (each)-.II .. Span 0-. Type overhead travelling bridge 2 600 tons 72 ft , .]? 6.PENSTOCK VALVES None 7.INTAKE GATES NufRb-e r ••••••-_••••••••••'. Type . Width . Heig,t -. Head too center line . Hoist.'••••••••-••••••• 3 bonnet ted fixed l'41ee 1 18 ft. 18 ft. 730 ft. hydraulic 8.INTAKE BULKHEAD GATES 9.TRASHRACKS Number _. Configuration......•~. 10.DRAfT TUBE GATES Number of Openings per turbine•••••••••••••••••••••• TYfle of Gate _. Handling ...••..•.•..•..•••.......•.........•....... 2-8 2 vert ical semi- circular 2 bulkhead overhead travelling case - TABLE 2.4:(Continued) 11.TAILRACE TUNNEL STOPLOGS Number of openings ••••••••••••••••••••••••••••••••• Sill beam •••••••••••••••••••••••••••••••••••••••••• 12.SPILLWAY CREST GATES Number ••••••••••••••••••••••••••••••••••••••••••••• Type ••••••••••••••••••••••••••••••••••••••••••••••• Width •••••••••••••••••••••••••••••••••••••••••••••• Height ••••••••••••••••••••••••••••••••••••••••••••• Head to sill ••••••••••••••••••••••••••••••••••••••• Hoist •••••••••••••••••••••••••••••••••••••••••••••• 13.SPILLWAY STOPLOGS Number of sets of guides •••••••••••••••••••••••••••• Number of sets of stoplogs .. Sill beam •••••••••••••••••••••••••••••••••••••••••••• Width ••••••••••••••••••••••••••••••••••••••••••••••• Height ••••••••••••••••••••••••••••••••••••••••••••••• Corps of Engineers 1979(8) 1 El 1405 3 radial 55 ft. 45 ft. 44 ft. wire rope 3 1 EL 2147 55 fto 46 ft. r~ 14.OUTLETS (Main Gate) Number ••••••••••••••••••••••••••••••••••••••••••••• Type ••••••••••••••••••••••••••••••••••••••••••••••• Width ••••••••••••••••••••••••••••••••••••••••••••••• He ight ••••••-•••••••••••••••••••••••••••••••••••••••• Head to centerline •••••••••••••••••••••••••••••••••• Hoist •••••••••••••••••••••••••••••••••••••••••••••• 15.OUTLETS (Emergency Gate) Number ••••••••••••••••••••••••••••••••••••••••••••• Type ••••••••••••••••••••••••••••••••••••••••••••••• Width •••••••••••••••••••••••••••••••••••••••••••••• He ight .•••••••••••••••••••••••••••••••••••••••••••••• Head to centerline ••••••••••••••••••••••••••••••••• Hoist •••••••••••••••••••••••••••••••••••••••••••••• 16.OUTLET TRASHRACKS High Level 2 radial 10 ft 14 ft 250 ft hydraulic 2 bonnetted slide gate 10 ft 14 ft 250 ft hydraulic Low Level 2 radial 10 ft 14 ft 490 ft hydraulic 2 bonnetted slide gate 10 ft 14 ft 490 ft hydraulic ~ I I Number of sets ••••••••••••••••••••••••••••••••••••• Con figur at ion •••••••••••••••••••••••••••••••••••••• 17.DIVERSION CLOSURE GATES Number ••••••••••••••••••••••••••••••••••••••••••••• Type ••••••••••••••••••••••••••••••••••••••••••••••• Width •••••••••••••••••••••••'••••••••••••••••••••••• Height ••••••••••••••••••••••••••••••••••••••••••••• Head to center line •••••••••••••••••••••••••••••••••• 18.DIVERSION PLUG SLIDE GATES Type ••••••••••••••••••••••••••••••••••••••••••••••• Number ••••••••••••••••••••••••••••••••••••••••••••• Width •••••••••••••••••••••••••••••••••••••••••••••• He ight ••••••••••••••••••••••••••••••••••••••••••••• Head to centerline: -for control ••••••••••••••••••••••••••••••••••••••• -after closure •••••••••••••••••••••••••••••••••••• Ho ist •••••••••••••••••••••••••••••••••••••••••••••• 2-9 2 flat,slightly sloping 1 set wheeled bulkhead 30 ft 38 ft (approx) 239 ft bonneted slide gate 2 6.75 ft 10 ft 255 ft 730 ft hydraulic TABLE 2.5:DEVIL CANYON PROJECT -DENALI DAM -MECHANICAL EQUIPMENT OUTLET WORKS CONTROL GATES Number •••••••••••••••••••••••••••••••••••••••••••"••••• Type ••••••••••~••••••••••••••••••••••••••••••••••••••• Width •••••••••••••••••.•••••••••••••••••••••••••••••••• Hei.,;jlt . Head to Centerline ••••.••••••••••••••••••••••••••••••• Hoist ......•-.-....•........•...............•..........• OUTLET WORKS EMERGENCY GATES NurrtJ.er .•••••••••••••••••••••••••••••••••••••••••••••••• Type ••••••••••••••••••••"•••••••••••••••••••••••••••••• Width •••••••••••••••••••.,;'••••••••••••••.•• Height ••••••••~. Head -to center line .......................•'•••••.••••.'Ii •• Haist •••••.•••••••••••••••.••••••••••••••••••••••••••• 2-10 USSR March 1961(10) 3 radial 10 12 210 ft hydraulic 3 bonnetted slide gates 10 16 208 ft hydraulic )-~-1 ---1 -~-~)~~l ~-:J '~-~--]-~--l J Site/Scheme (Pool E1.ft.) Gold Creek TABLE 2.6:HYDROPOWER PARAMETERS ~pendable Average Approx Installed Annual Firm Max Head Capacity Capacity Enl}rgy Enl}rgl' (ft )(MW)(MW)(x1O kWh)(xl0 kWh) 190 260 1.139 %of River Potential* 17% Remarks Referred to as Gold Site by the federal Power Commission(J) N I............ Olson (920) Olson (1020) Devil Canl'0n(1450) High D.C.(1750) Devil Creek Low Watana (1905) Mid Watana (2050) High Watana (2200) Susitna HI Vee (2300) Vee (2350) 45 145 570 720 700 425 420 570 500 720 792 600 445 375 425 187 206 600 252 457 686 300 0.915 1.489 3.346 1.550 2.601 3.346 1.450 0.821 13% 0.900 21% 2.628 47% 1.104 22% 1.997 36% 3.004 47% 1.840 28% 1.310 20% With U/S Regulation Data obtained from Kaiser(4) With U/5 Regulation Maclaren Denali (2535) Butte Creek -----------------------------------------NO POWER GENERATION --------------------------------------------~----------- Tyone Devil Canyon (1450)570 -575 3.300 2.500 46% Denali (2535) Devil Canyon (1450)995 .-730 4.485 3.200 62~~ Low Watana (1905) Devil Canyon (1450)1,140 -1,062 5.630 4.650 78% Mid Watana (2050) Devil Canyon (1450)1,290 1,568 1,404 6.850 6.150 95% High Watana (2200) TABLE 2.6:(Continued) Average Approx.Installed Dependable Annual Firm %of Site/Scheme Max Head Capacity Capacity En 9rgy En 9r gy River Remarks (Pool £1.ft.)(ft)(MW)(MW)(xl0 kWh)(x10 kWh)Potential* Devil Canyon (1450)1290 1,552 6.911 6.800 96% High Watana (2200) Denali (2535) Susitna I 1455 1,308 6.309 88~o Data obtained from Susitna II Kaiser(4) Susitna HI Devil Canyon (1450)1370 1,427 6.881 6.252 96%USSR four dam proposal Low Watana (1905)(10) Vee (2300) Denali (2535) Olson (1018)1238 1,347 6.511 5.900 91%Kaiser four dam proposal High Devil (4) Canyon (1750) N Vee (2300) I Denali (2535)I-' N Dev i.l Canyon 7.181*6.552 100% Watana Vee Denali Olson NOTES: All data obtained from US Corps 1975 Study (7)unless otherwise indicated. *Percent of Average Annual Energy with Devil Canyon,Watana,Vee,Denali;Olson assumed to be 100% f,=:,...,J ",..,J -.~.J ".J ,,,,,..,J ,,,".:-"J <",.",),)__J )'1 ~'1 l r--J -~-)-_.-)-~._]-~1 '---1 -~--]-~-l TABLE 2.7:UPPER SUSITNA ENVIRONMENTAL DATA BASE fOR INPUT.INTO mE SELECTlONOF DEVELOPMENT SITES (Includes only information that varies between reaches) N I...... W Biological: fisheries Wildlife Vegetation Talkeetna to Devil Canyon (Reach A) -Resident &migratory salmon -Provides salmon access to Portage Creek and Indian River -Moose habitat in river valley downstream of Portage Creek -Mainly upland or lowland spruce- hardwood forest Devil Canyon to Watana (Reach B) -No 'anadromous fish Nelchina Caribou herd -Summer range north of Susitna River -Summer &winter range south of Susitna River -Migrat ion in the area of Fog Creek Watana to Vee (Reach C) -Inundation of part of Deadman &Koaina Creek Caribou -CalVing area south of Susitna River in the area of KosinaCreek -Migration in the Jay Creek area -Ranges as stated for Reach B -Moose habitat Watana Creek Vee to Maclaren (Reach D) -Inundation of part of Oshetna and Tyone River -Inundat ion of posible moose winter range -Medium waterfowl density -Caribou migration in the area of Oshetna River Maclaren to Denali (Reach E) -Brown Grizzly bear denning adjacent to reservoi l'area -Good moose habitat -Medium wate r- fowl density -Fragile moist &alpine tundra Upstream from Q:lnali (Reach F) -Waterfowl nesting area -Good moose habitat -Medium waterfowl density -Fragile moist &al- pine tundra Social: Aesthetic Recreation -Unique Devil Canyon --Moderately unique ____Vee_C El nY ol1__ -White water kayaking Class IV Devil Canyon Access -Access road would open up minimal area of wilderness -Access rpad would open up moderate area of wilderness -Access road would open up moderate area of wilderness ~Access road would open up la rge areas of wilder- ness presently inaccess ib Ie -Access road would open up large areas of wilderness presently inaccess ib Ie -Reservoir could have access from the Denali Highway, therefore impact on wilderness area minimal TABLE 2.8:COST COMPARISON Site (Pool El.) Estimated Cost (1~ ($x 10 ) Year of Estimate Escalation factor (Whitman Index) 1980 Cost ($xl06 ) Dependable Capacity (MW) Cost $/kW Avg.~6t/Avg. Annual Energy Cost Engrgy Cost (9)Notes (10 kWh)($/1000 kWh) Gold Creek 338 1968 550/210 885 260 (4)3,404 1,139 (5)117 (J)(6) High Devil Canyon (1750) 1,266 1,015 Devil Creek Low Watana (1905)668 N 420 I I-'Mid Watana (2050)~877 628 High Watana (2200)1,088 837 1,765 Susitna III '''' Vee (2300)477 Vee (2350)527 Maclal'en Denali (2H5)340 Denali (2552)134 Denali (2590)80 Butte Creek 187 2,964 915 91 206 5,056 1,489 105 695 906 3,340 28 206 3,277 1,489 68 206 3,286 1,489 79 695 1,122 3,340 35 695 1,315 3,340 41 600 3,078 3,346 83 600 2,470 3,346 67 - - - 252 3,868 1,550 94 252 2,431 1,550 59 457 2,800 2,601 74 457 2,004 2,601 53 686 2,31J 3,346 71 686 1,780 3,346 55 686 2,859 3,346 88 --------- 300 2,320 1,450 72 Olson (920) Olson (1020) Devil Canyon Arch (145ll) Devil Canyon Gravity (1450) 380 714 432 463 535 535 82J 1975 550/377 554 1975 550/377 1,042 1975 550/377 630 1975 550/377 675 1975 550/377 780 1975 550/377 780 1978 550/495 914 1975 550/377 1,846 1975 550/377 1,481 - 1975 550/377 975 1975 550/377 61J 1975 550/377 1,279 1975 550/377 916 1975 550/377 1,587 1975 550/377 1,221 1978 550/495 1,961 ------_....----- 1975 550/377 696 1975 550/377 769 - - 1975 550/377 496 1960 550/170 433 1953 550/122 331 None None None· None None None *(3)(6) *(2) *(3)(6)with H.Watana *(8) *(7) *(7)(6)(3) (3)(6)with H.Watana *(2) *(8) *(2) *(3) *(2) *(3) *(2) *(3) *(2)Revised Estimate *(3)(6) *(3) *(3) Tyone *Estimated in same base year therefore best for comparison purposes 1 1 Generally includes contingencies but not IDe 2 Constructed first (i.e.includes main access road and transmission line) 3 SUbsequent development 4 Installed capacity 5 fl rm energy 6 With U/S Regulation (7)1978 cost adjusted back to 1975 using relative costs of Arch Dam and Gravit~Dam,Page B-9,Corps 1979 Report (7) and escalted to 1980 costs (8)Constructed first but excludes common costs of trans- mission lines and roads ($251,000,000 -1975 $'s) (9)Based on annual cost equal to 15%of Capital Cost. f;L}"<:jccJ "".""..J ~.,...J ",,,,"._~J 'do:.J ) I J '1 ,"))/-'")...•,)'-)~l ')'.1 fIGURE 2.1 11111 DAMSITE NAME.LOCATIO .. Of USGS GAGING STATiON CANTWELL 2915 ~EGENO IYO ..E .. ,..----_/ LOCATION SCALE:?10 10 ¥ILfi N N I I-' Ul OSHETNA RIVER ./"I I 2500' i J 2000' RIVER .A'OOO ' 2500' 2000' 1500' 280260 M ct 1905'~z Z !:: c( 2051 en tJti::) •en > •·2200' ~r 11000': 200 I I I I I I 500'III 1 I I I,I ..... H ! ~ U).... ---::0:::TYONE RIVERF·2000' :~MACLAREN I r::::---u 2200' I 1 _•~z~3 d POfiTA..CR.r--.I!~ ~d %0 1750' .01 GjGj J~~~~~~F:::~±--~--~!-~;--Z;;~5 ~~-~450~-- 9 I I8870, 102d •II- N I -.I 0\ 100 .20 ENVIRONMENTAL STUDY REACHES-' PROFILE THROUGH ALTERNATIVE SITES ",.~,J-".;;r-~....j-_..r _..J-'.._.:T-..::..)-,••....h~•.....J.J-._.,.J-.,_,h~••:.J-.';'~'J~·?;~lil~JI - - ,- 3 -SCOPE The publications listed in the Bibliography of this report were reviewed. Discussions were held with the engineering staff of the Corps of Engineers in Alaska.Data was collected from the reports and from material such as working files and drawings obtained from the Corps.The type of information obtained ranges from detailed layouts to merely an identi- fication of a potential site.Table 3.1 lists what data is available in terms of engineering layouts,topographic mapping,geotechnical field drilling,and air photos.The available engineering layouts are included in Appendix A. J ,]-J J -'I "1 1 -'--J ~']--']-} TABLE 3,1;CORPS OfENGJNEERS -EVALUATlON OF ALTERNATiVES (Reproduced from (l)) IL/dl A ,\JdI a 'lldl C 'WI 0 Wl1l10tJT CO::DUtOH ItAtlOOA.L [C-ofJoltlC DEVEL01'HEHf (HEG) ""VlkOfl11"'TAL quALITY (P,Q)'ws MXDtllt f'OUER DEVELOl'tttHT PlAN PltUOUSl;Y U:Cott1&NDf.:D FLAIl USDa lour-».tlt 'vu"",Devil Cat1)"JII~Wd.t\f-DeMllDaM'Dull Canvttn-WIUN 0....Con.,."tlcmll'Cod 'I1lenul Pint I I -I I I --I A.PIAIIIl£SCR,PTIOlI Hon-federa'Hnandl19 o("JOO-17M co.l .. ;~i~~-~n~~:~~tYr:~.;ta~'l ~~a~:I:~~.· The plants kOvid hillye 15-Yll!at'service Itve!;,Project WQuid 'nclude co~U 'fOr ttl!ltl .'A'ng .tnd sep.r.te Heotly-to- Fa h:blnh alld 8eluga.to..Al\ct'torICJe trGlns~ JIIhSIon s"tellls. fedel',1 fln,nclng:of the total syslem to 'nclude •thin-arch dim Ind under .. ground Ifowerphnt at the Dnt'C.nyon sH-e t and an,el/llrttJrtl1 dam Ind under- groU"d ,potilerphrtt at the Wotanl s Itt. Doth projects would proyjde it-lite power:gefltlratliJl'l.WaUn.would provide the senon,,'storage 'ot'the 'YUelR. ""an wquld .Iso Include tUnsmlss 10ft systenl betweeA projects ',nd to the Anchorage ,nd hlrba"k5 load centerS. Ihl$pl.n h ".,Icolly the ......th. Phn 11.'but with the Iddltlon or the De"tH Projt1ct liI~uld hive no at~slte POWI'generatlDll .nd would be used onlt for low ntH lu~mentat Ion of the tw- dow~strea.DroJects. Thl$Is the .y,t••pr'po,.d by th. Bureau 0'R,eclatilltlon In hs 1952 report OR hydt'opQWe:r resources 01 thl Upper Susltnl River B.sf.".Federal rtnanelng. of the tot.,system to (rtcl!,lde I, thtn·arch dam ,'nd etQwerpI.nt ,t tht Oe~tI CIPYorI ,ne.I 1010'head e.rth~ ffll dalll lind powerphnt .t the HltlPa :{t:hea~e:l~t~~,~I :1l~A:.;~:w~:~:~~:~ lion rnervatr it the benalt Itte. Plan would .ho Include transllliulon $YHl!ln between projects Ind to the tlll'O load centers. 1.Dim H~lghU ~.Oap.nd.ble C.p.elty B.SIGNIfiCANT IIlPACTS No OIms '.500.000 kllo••U, (Included In Meht lon~hlp tID four Accounts) I.DevU Canyon ..f»]5 feet 2.H.lona -810 reet ',)94.000 kilowatt, (Included In Relatlons'htp to '(Iur Accounts) ~II.0••11 C.nYOn -6JS fe.l-2.W.t •••-810 f ••, ).Oen.11 -260 r••t 1,5\2.000 kll""'lts (hc'ud~d 1ft tlehtlonsl',tp to Four Accounts) t,Dev II Caf'yvn •US fee t p. 2.lrIatMI ..515 'eet ).Vet.455 'eet 4.O.n.lI·~60 ,••t 1,404.000 kilowatts (lnclud.d In R,'allon,hlp 10 f.ur Account,). 0 $J),8SI.000 $29.611 ,000 "6.195,000 1.0 I.)I.J 1.2 10,000 50.550 lD',5S1l 84.950 0 l]'oOD 45,000 45,000 IID-'~D Bt 116 UO 0 ,9 9 '0,000 4.000 4.000 I 10,000 2,II<lO 0 52,000 52,000 21000 acrt'0 .00 400 Unquant I tied .rea ~a,very ''''gh 40 60 I BSpotentIII 0 D 0 , 0 ,4 4 5,850,000 S,a50.000 I 5,8)0.000 26.4 _)1.4 I 21.1 ~I.O J ~4.J WI . N C.PLAN [VALUAtiON \,COntribution to PI.nnlng Obj.ctly,I,Firm ""AUO'E"erg)' b.Average An.,ua'lnenJY c.hrtent of eutn Potent'" d.Sy.l...O....nd.blllly 2.Rehttonshtp to Four Account$ a.'lal1onal Economic Developmel'lt (tfED) .NET NED 8Um IS OEN[rlT.TO-CllST 1lA1I0 b.[n.lro..,.nt.,QUality (Eol Acreage IntindatJ!d or Oe'itroyed Drawdown ZOne Acreage stl'dll iUI@oge Inllndaled or Deg"iIIded WhllewUel'Mileage Inundated HaJor ,[C05YSlefnS.Acreage Inundated or Otlslroy.d Important Hoose flaM tat Import'Rt C.rltJl'lU ~ablt.t Important W.ltr,,,,,1 H.blt.t 'nuMbet'0'pothole Ides) Are~••0109Ical '.n.,Pr.tludtd t-rom Post.Construction 5tudfes Prehhtorlc:SUes In~ndated or lleU r oyed Mhtorll;Situ Inundated or Destroyed c.Socl.1 H.II-b.ln9 (s\/tJI fnergy Re~out'c:e$(onut'ved 1ft Tons I:Jtr Year d.R'910nal O•••'opment (1lIJ) Cost or Power hi HU is/KwhI' l.PI,,"Responsf to ASlOcli/llted [vJJlu"Uon Cr'terti ••Ae<.pt.bliity 6.800.000.0!Nl kllowUI·h.u... 6.910.0110 ,000 k /low'll-hou•• Not Applleable ti~grid Intertle of ""Jor lod center;, ~,d.tld dep.nd.blllty. Thh I:Jhn 15 the worst trlJ;l~thp "tand- poi"t of (Onserval lOA of POI.t"enew"ble res.f)urces.It ha'large Idv'!!ne (Q effects In that It requires strlp- mlntng of 20,000 acres of hnaorta t .lldllf.h.bltat.It d'9rod ..wtl .. qUlllty by chemfcal Inputs and $uspellded sedtlllents lind It degrede!...II"qui tf ty by Inputs Qf parltcuhtes .nd chelllical pollutants.Its N£D'perfor~nce h <1C1;~ptahh.It prov'de~no flood control or rec::reat ionll (JJlportunft)'. 6,100,000,000 UI"".tt.hour. 6,910,000,0<10 U1QWltt~hour. 9n Prowldes grid Intertle of meJor toad centers. MaxlfIlUIIl beneftcll'Imp,cts or options studied in NED and [Q lccounts. Supported b)',consen~us of IIldst pubHc:s. P'.n 11'$drawn some coucern bet.use 0' possibility for IndUCed populatIon 9row1h Is~oclUtd \IIIlth inHtal.power on line,n well II the adverse hriPllct,on 'Ish lind wildlife v.lue••Woold pro .. vide flood control "nil recreation p(llenthl. ~1800.0CH).OOO Itt lowatt-hout" 61 9'01 000.000 kllowa tt~hours 961 Provides grid lfitertle of .aJor load centerS. I~re.te"ldvrrse [Q ,rrects thfn In [r'(!f;onmeAded phil.Rlnh secolld to the recolmlcrded "Ian III the N£O ICCOUl'lt. ~o\Jld provide JIJoU'lN,lm-,fff1ll pc)wer 0' t)'dro develDPmellt phnt.Would ,provide ,.'lood·col'trol Illd recreation potentla'i. 6.150.000,000 kll....lt·~ours fiIBOO.OOO,OOO ttlowlU-hourt 9Sl PrDvldes grid tntertle or major 'Old cet'llers. BeneflCI.,impacts 11'1 NED.SWI,Ind RD .tccounts.IIIIS good C1otenth1 for st.ge developm~nt of h)'dt'o pt'oJech Idd 1$pl.n f.vored b)'AlUla Power AdlllhlhtrAltOit"Alnl~low 1n the [Q account lit COlllpuhhn to Dt-ber Ilter- nlUves.Would provide flood control a"d recreation potenth" 89 Revhed ,Jun lfi TABLE 3.1:(conti,nued) JWI Ii. "lnIOUT COUDlliOiI t.<ln\H:ntlDnal Co'"""e~l ,.....1: ru.1'«• Dev"CAn)'on.o\l',u.n.a D.1II-!1 tUM • ""IntUIt '0...f.1 DEVU,oI'ttE"'PL\N ""n C'''JOft-''.ta.w~DeI,*ll Da... '...... UtV10ilSLY aECOttlf.UDED t·UN usn.'our ~lla.I ••U:.. JI.....,v'luatiDn ••tOI'"Ill"I ucepc for' atuase I::Ontrol pl'OJtO::l .t IH!MU tttt. U~ltiDtld ilkplotuhuwl teqvlrd ....oril!; thh UI"lIc:tul'e cOl,lld be ...ciDllWflllnd.d. Hon Il~.tbt.th."ptin I. C.l'U!t EVALlIutON (Cont.) l.Ph"lIe'fonlll to AIIloclau4 [ullu.tlon CI'He .....(Cant.) b.C.rutn~f' c.Col'IJ'htenll$S 1llh .f1pu ....to b.lilt l"",h_nt.....,pta \ftrLch coulcl III punut>.d to ...t In."8, l'Ieli!d.(01'the n,I"Ind lonll nOSI (ut\ll'e.It IIlI the 1'I01It n ....ttl.pl~n in tChll ot hK:re~ntlll dellelor-nt ,pi OllUaUon ,otenthh. Could m,u:ch lh.Inl"IY Dutput 'If ""1 phnll e.....llIIIud hti ....".11 Ions ...[ue.l Jo;tllrte 'I ......Il."lIe. found.Uon cOnUtiou 'ppe.t cdeq-u.t. fot con.h'odian of both pl'oJnt•• Tr."IIIR1.,al'tll _,tt ••II vitMn t"-lIII:an. of "rl"."'luuhnology.......t HelliMe of .h.nathn lO Chl'lS~.In PI'DJcctlll:d rowel'delllAnd. frovld ••.ad~\J.llte ,Witi'tC'saUdy ,.-oJected iI,lIm'"~I'~th until ..1....1990·"'; Lnth pote~tl.tl fol'Up....IDn.D.lI~nd beyond tbe pr'~JQct upabHhy will hlI ....e to be mill by .athltr de~e1op"~nt. t:~l~I::~~O;I':j.::I'.~l::l!t ~::c:r:e. Addlttonal uplou,U.on or .but~l\t Ntubl rcql.l.lud bdo...thai d•• c~l,Ild b.neCRlR8nd.d roC'the Utut;turall h.laht .t.t,oJ .brn/..HOlt U.dbh of hydl'o altuJtnh... p.-ovld'/JI .dl!'quat\ll:pwu to utt.ry I'PtoY~d ••ade.u.t.pOWII'to ••ll..,•. 'l'cpjeChd dc_nil Irowth until .ld"l'tolJII p~J.ctcd &lellllnd Il'owl:h I,Intlt IIIld ..l'?O'•. Uule pOlmUid hr exp.n.lo"h DelrWnd Little pOUdtlal rolt aJll'll'Idon.Ihl~ItIl"" bell)ild the proJP.~t up.iJ.Ult,litln baYe -be,ond the prtr-Jut cap.bUIl,.vUl have to be _t tly Dther III1!VdOp"'iln-t.to be -;t by othe..d .....l~p""ltllt. d.Eff"Cll\lell'~"Coyld h(t eJlp.llnlicd lnd,pURln',to U"h.of fud. ,"oulll d.vdor "puunt or h..ln ~,vellJp"'tnt 1":lt.ntlal. DovttlCII".UIII t,u t 11 r.pOWII'•eq....d to "I....III ....Il......nn....'pow.t. Wo,*ld d.velop U puunt of ....... d.velDplM!nt p,d.nU... W I W D.ttttUltEtirUIOU M£SPOHSIBII.1TY l.fltLInl:h'III:,.ptmllbtllt)' Z.Rl!c",..Uon SpoCliIonli1p '..lv,Uo .rrd/ol'u!llll¥publtc anUU .. cl.I(JrdhlAud 'Vld.redercl ancl St"tll tCIUutol"J'alentlelll, Hone t•.Ja ...1 Covetnllt'nt ....lth p~l:r ....I'ketc<l ,I fedlnal C6~...__"t with PIN.I'_I'kct.d throtl8h the ,,1..1ta "oweI'Ad'dllhtr.Uon.thl'oush tbil Atasu "own Ad...(nlur.tlon. hu.ot AI.......I lUI:·01 "Iulta ,.lIn.l GOVUftuoe"t-with '011'" "l'lI.ud thl'~u8h the "1.,u rD\I"- Ad.l_htt.tion. Stat.of AI ..1c4 ,.,1 J ~4J ",,],,,,-oj J ,-. i - 4 -PREVIOUS STUDIES The earliest studies were undertaken by the Corps of Engineers in 1950 and ident ifi ed several potent i al sites for hydroel ectr ic power development in the Susitna River Basin as part of a reconnaissance level survey of Cook Inlet and tributaries.A second study;the Bureau of Reclamation IIReconnaissance Study on the Potential Development of Water Resources in Alaska ll was completed in January 1952. Subsequently,the feasibility of hydropower development of the Susitna River has been the subject of several more detailed studies.The most significant of these were conducted by the fa 11 owing agenc ies (or company): -U.S.Bureau of Reclamation (11)-1953 U.S.Bureau of Reclamation (10)-1961 -Alaska Power Administration (1)-1974 -Kaiser Engineers (4)-1974 -U.S.Corps of Engineers (7)-1975 -U.S.Corps of Engineers (8)-1979 The above studies are discussed in more detail in the following sections. 4.1 -U.S.Bureau of Reclamation -1953 This represented the first major study and was completed in 1953.The following ten sites were identified above the railroad crossing at Gold Creek (see also Figure 2.1): -Gold Creek -Olson -Dev i1 Canyon -Devil Creek -Watana -Vee -Macl aren -Denal i -Butte Creek -Tyone (on the Tyone river) An additional 15 dam sites were identified within the remainder of the Susitna Basin downstream of the Gold Creek railroad crossing. The sites at Butte Creek,Devil Creek,and Gold Creek were eliminated from detailed study on the basis of field reconnaissance.The other sites were included in desk studies involving the development of conceptual engineering layouts and costs.Selection of the development plan was based on maximizing energy output for the least cost.This plan included the development of the fall owing sites: 4-1 Olsen: Devil Caynon: Watana: Vee: Dena 1 i: Max.pool e1ev.=920 ft. =1,417 ft. =1,900 ft. =2,330 ft. =2,590 ft. Installed capacity =50MW =390MW =310MW=260MW No power generation facilities The first stage of development involved a dam at Devil Canyon with an initial installation of 195 MW of generating capacity.To meet subsequent increases in demand the dam at Denali would be built.This would provide sufficient regula- tion to allow dOUbling the capacity at Devil Canyon to 390 MW.The sequence of construction for the remaining developments would depend on future load growth. It should be emphasized that this USBR study was very preliminary in nature.At the time of the study,1 imited mapping and geotechnical information as well as only two or three years of hydrological records were available. 4.2 -U.S.Bureau of Reclamation -1961 In 1961 a more detailed feasibility study dealing specifically with the Devil Canyon-Denali development was completed.It recommended'a five-stage construc- tion scheme be used to match the load growth curve.The first stage would consist of a 635 ft high arch dam constructed at Devil Canyon.Initially,3 units totaling 217.5 MW were to be installed.The second stage involved build- i ng an earthfi 11 dam wi thout a power house at Denali to increase the depend ab 1e energy at Devil Canyon.Stages 3 and 4 each involved a,dding two units and stage 5 one unit,to the Devil Canyon powerhouse,leading to a total installed capa- city of 580 MW. The increase in installed capacity over the value derived in the previous study resulted from the greater level of detail to which the development at Devil Canyon was studied.The full pool elevation of the Devil Canyon Reservoir was increased by 33 ft to 1,450 feet.The larger period of streamflow data (10 year vs 2 years)allowed a more accurate determination of the mean annual flow which was 12 percent higher than the previous estimate.The proposed development was also sized for a lower plant factor. 4.3 -Alaska Power Administration -1974 The status of the Devil Canyon Project was reviewed in a report which was essenti ally an update of the USBR 1961 report.One major change from the 1961 report on Devil Canyon Dam was the change from a single curvature arch to a double curvature thin arch dam.Revised load forecasts as well as revised cost estimates and schedules were included in this report. 4.4 -Kaiser Engineers -1974 This study suggested an alternative to the USSR scheme of development.It was proposed that the initial development consist of a single dam known as Susitna 1*located at at site approximately 5 miles upstream from the USBR Devil Canyon site.' A 810 ft high rockfill dam at this site with a pool elevation of 1750 ft *Note:Subsequently this name has been changed to High Devil Canyon. 4-2 - - -I, - .,- would provide sufficient storage for 600 MW of dependable capacity without an additional upstream reservoir.Because of the perception that foundation condi- tions at Denali are questionable,this scheme was preferred to the USBR Devil Canyon-Denali scheme. Kaiser suggested the ultimate development would incorporate Susitna II located downstream at approximately the same location as to the USBR Olson Site,and Susitna III located at the upstream end of the Susitna I reservoir.The exact location of the Susitna III site was not identified but it was determined that a head of 600 feet could be obtained.Information developed for the Susitna II and III site was limited to an estimate of the energy potential.The report also mentioned that the future addition of Denali,if foundation conditions proved to be adequate,would increase the energy generation potential of the other three sites.. 4.5 -U.S.Corps of Engineers -1975 The most comprehensive study of the hydroelectric potential of the Upper Susitna Basin was completed in 1975 by the Corps of Engineers.In this study several schemes of development were considered including combinations of dams of various heights at the following sites: -Olsen; Dev i 1 Canyon;' -High Devil Canyon (Susitna I from the Kaiser Plan); -Watana; Vee;and Denal i A total of 23 alternative developments were identified and evaluated using a II scop ing type"economic analysis.The results are shown in Table 4.1.Alterna- tives were selected for final evaluation based on "max imizing net benefits consistant with engineering judgementl/.The more promising of these alterna- tives are listed in Table 4.2 together with their respective firm annual energy, dependable capacity values,and comments relating to further study. The four most promising alternatives for meeting the future power needs of the Railbelt Area were selected for futher studies.These were: -Coal (considered to be the II without"Susitna condition or the base case); Devil Canyon (1450)Watana (2200); Devil Canyon (1450)Watana (2200)-Denali (2535);and Dev;1 Canyon (1450)Watana (1905)-Vee (2300)-Denal i (2535) Note:The numbers in brackets refer to the maximum pool elevation in feet. Each of these alternatives were evaluated using the following four criteria (See Appendix B for a more detailed definition of the terms): -Techn i ca 1 Cr iter i a; National economic development (NED); Environmental quality criteria (EQ);and Social well-being and regional development 4-3 Table 3.1 gives a summary comparison of the four alternatives in terms of the above criteri a. The scheme finally selected by the U.S.Corps was the Devil Canyon (1450)- Watana (2200)option.It maximized the National Economic Development and also minimized environmental effects.The scheme involved the first stage construc-" tion of an earthfi11 dam at the Watana site with a height of 810 feet.Three 264 MW units would be installed giving a total capacity of 792 MW.The second stage involved a 635 high thin arch dam at Devi 1 Canyon and would be constructed to meet future local growth.The Devil Canyon site would have an installed capacity of 776 MW.Firm annual energy was estimated as 3.0 x 109 kW-hr for Watana and 3.2 x 10 9 kW-hr for Devil Canyon.The benefit-cost ratio for the total development was computed as 1.3 with power benefits based on the cost of .the coal alternative. 4.6 -U.S.Corps of Engineers -1979 In 1977 the Office Management and Budget (OMB)questioned the economic justifi- cat i on of the project.Concerns expressed were that the cost est imates for Watana were not based on any geotechnical investigations.Also the construction schedule required higher construction rates than had ever been achieved.These concerns~as well as several other comments~were addressed in 1979 in a lISupp1ementary Feasibility Report".Highlights of this later study include:~ -At the uevi 1 Canyon s ite~a concrete gravity dam was analyzed as an alterna- tive to the thin arch dam.This was done to provide a more conservative basis for economic evaluation in the event that subsequent more detailed field data collection and engineering design studies proved an arch dam to be technically infeasible. Results of additional geotechnical exploration at the Watana site performed in 1978 were incorporated.As a result~the Watana dam \'Ias changed from earthfi11 to rockfi11. -The total construct i on peri od for both dams was increased to more accurately reflect historical construction rates. New cost estimates were developed and the economic analyses redone.The revised benefit-cost ratio was found to have increased to 1.4 because the value of power~as assessed by the coal thermal alternative~had increased more in the five year period than the construction costs. Sensitivity analyses were carried out to determine the effect of different rates of local growth on the economics of the proposed scheme.These revealed that the local growth rate would have to fall below 0.8 percent annually before project costs exceed benefits.This lack of sensitivity was due in-part to a large number of fossil-fuel plants which were specified to have planned retirements close to the proposed on-line dates for the Susitna development and should therefore be interpreted with caution. 4-4 ~~]-.,--1 1 '-'-1 1 --]1 --1 TABLE 4.1:CORPS or ENGINEERS -"SCOPING ECONOMIC ANALYSIS" System of-----m ---10ta1 AI/erage lota1Average Development Annual Costs Annual Benefits Net Benefit ($1000)($1000)($1000) Devil Canyon,Denali,Vee (2300),Watana (1905)102,491 109,461 6,970 Devil Canyon,Denali,Vee (2350),Watana (1905)104,445 112,407 7,962 High Devil Canyon,Olson,Denali,Vee (2300)139,984 113,654 -26,330 Devil Canyon,Watana (2200),Denali 110,091 133,188 23,097 Devil Canyon,Watana (2050),Denali 99,094 118,615 19,521 Devil Canyon,Watana (1905),Denali 88,150 98,727 10,577 Devil Canyon,Watana (2250)104,336 126,262 21,926 Devil Canyon,Watana (2200)96,600 126,188 29,588 Devil Canyon,Watana (2050)85,604 103,193 17 ,589 Devil Canyon,Watana (1905)74,660 78,222 3,562 Watana (2250),Devil Canyon 106,379 127,147 20,768 Watana (2200),Devil Canyon 101,776 3/126,523 24,747 .po WatanB (2050),Devil Canyon 86,834 -102,547 15,713 I Watana (1905),Devil Canyon 72,034 77,168 5,134c.n Devil Canyon,Denali 69,651 63,858 -5,793 Del/il Canyon 51,561 29,644 -21,917 High Devil Canyon 90,651 67,397 -23,254 Watana (2200)78,046 73,029 -5,017 Watana (2050).63,104 54,741 -8,363 Watana (1905)48,304 31,574 -16,730 1.Number in parenthesis represents the normal maximum pool elel/ation of the project. 2.Project staging in sequence as shown and each project was assumed to have a five-year construction time. 3.Six-year Watana construction and IDC based on annual expenditures would have resulted in an Annual Cost of $103,920,000. TABLE 4.2:CORPS OF ENGINEERS -DATA PERTAINING TO PROMISING SUSIlNA DEVELOPMENTS .j::> I O'l Firm Annu~l Energy x 10 kWh Devil Canyon (1450)0.9 High Devil Canyon (1750)2.6 High Watana (2200)3.0 Devil Canyon (1450)-Denali (2535)2.5 Devil Canyon (1450)-High 6.1 Watana (2200) Devil Canyon (1450)-High 6.8 Walana (2200)-Denali (2535) High Devil Canyon (1750)-Olson 5.9 (1018)-Vee (2300)-Denali (2535) Dependable Capacil:y-MW 206 600 686 575 1,404 1,552 1,347 CORPS OF ENGINEERS COMMENTS Not economic by itself Not economic by ilself Economic,however,same environmental impacl as project twice its size Nol economically feasible Economic -should be studied further Economic -environmental affects greater than Devil Canyon -Walana -should be sludied further Develops less than basin potential - Not economically justified "._,_"J ,"",_,1 .".,_~_:.~J ",._:._~J "--".._.J """i 5 -DESIGN PARAMETERS 5.1 -General For each of the twelve sites identified in the basin (Figure 2.1),information has been gathered and tabulated.At several sites various heights have been studied,although,not always to the same degree of detail.At other sites, such as the Susitna III site,very little information is available.Table 5.1 summarizes available topographic,engineering layout,subsurface investigation and air photo information for each site and the source of such information. In the sections that follow,some of the more pertinent parameters associated with the various sites are discussed in more detail. 5.2 -Civil Engineering Parameters Preliminary engineering layouts are available for the following dam alterna- tives: Max.Pool Site Elevation Dam Type Devil Canyon 1417 Concrete Arch Devil Canyon 1450 Concrete Thin Arch Devil Canyon 1450 Concrete Gravity r Hi gh Devi 1 Canyon 1750 Concrete Faced Rock- (Susitna I)fi 11 Watana 2200 Earthfill Watana 2185 Rockfill Vee 2300 Earthfill Denali 2535 Earthfill Denali 2552 Earthfill Copies of these drawings are included in Appendix A. For other levels of development,and dams at the other seven sites,information is limited to descriptions in the text of the reports. Civil detailed design parameters such as dam type,height,length,length-to- height ratio,reservoir area,gross storage,spillway type and provision for a low level outlet are listed in Table 2.1.A brief description of the more important aspects associated with dams at each site follows: (a)Gold Creek A 135 feet high earthfill dam constructed at this site would cause water to back-up to the Olson site.A spillway and power plant could be constructed on either abutment. Diversion of the Chulitna River (by two tunnels)and of the Indian River into the reservoir would considerably increase the energy generating potential of this site. 5-1 (b)Olson A concrete gravity dam at the Olson site would raise the water level 50 feet without encroaching on the tai1water level at the High Devil Canyon site.The spillway could be a gated overflow section in the center of the dam. (c)Devil Caynon At the Devil Canyon site~three dam designs have been proposed.Each of these designs has a maximum pool elevation of 1450 feet with a dam height of approximately 650 feet.These designs each consist of a main concrete section and an earthfi11 embankment 200 feet high and 950 feet long at the south end of the main dam. As proposed by the USBR (10)in 1961,the main concrete section is a single curvature arch dam.The Devil Canyon Project Status Report,prepared by the Alaska Power Administration (1)in 1974 included an updated design of the dam using a double curvature thin arch section.This design was also utilized by the Corps in their 1975 Interim Feasibility Study (7).In the 1979 report,the Corps (8)substituted a concrete gravity section as it was considered less sensitive to foundation conditions and led to a more con- servative (higher)cost estimate.It was pointed out that further geotech- nical investigations would be required to firm up the feasibility of an arch dam. The USBR design includes a tunnel spillway through the north abutment.The thin arch dam design has a chute-type spillway with a flip bucket located on the south canyon wall.For the gravity dam option the spillway is in- corporated in the center of the dam. (d)High Devil Canyon (Susitna I) A 810 foot high concrete-faced rock fi 11 dam was proposed for the High Devil Canyon site.The crest elevation was set at 1755 feet givi~g a maxi- mum pool elevation of 1,750 feet.Upstream and downstream slopes of the rockfi11 dam were 1.4 and 1.3 to 1 respectively.On preliminary examina- tion it appears that these slopes may be too steep for this type of dam in the area;particularly because of the high seismicity. The spillway is located on the south abutment.It is a channel type and incorporates a series of steps excavated in the rock to form a cascade. (e)Devil Creek Located just below the mouth of Devil Creek,the Devil Creek site appears sutiable for the Construction of a low dam.The maximum height would be limited to 350 feet by the right abutment.No layouts are available for this site. 5-2 - "....I ~ I (f) (g) (h) Watana Rockfill dams of various heights have been proposed at the Watana site. The most recent Watana Dam design presented in the Corps of Engineers 1979 report is a rockfill dam with a crest elevation of 2,195 feet and a maximum water pool elevation of 2,185 feet.This is essenti ally the same dam as proposed in 1975 (7)which has a maximum pool elevation of 2,200 feet.The discrepancy was due to corrections in topography made during field investi- gations.The dam is 810 feet high and incorporates a sloping impervious core. A saddle spillway is provided across the right abutment discharging into the Tsusena Creek.Twin diversion tunnels are also located in the right abutment.These tunnels would be converted to a high and low level outlets before completion of the project.The powerhouse is located underground below the left abutment. Susitna III The SLisitna III site is defined by the H.J.Kaiser Company (4)as a point above the headwaters of the High Devil Canyon (Susitna I)reservoir where a head of 600 feet could be obtained.There is no engineering information available at this site. Vee At the Vee site,any structure higher than 250 feet requires a saddle dam. Above height 480 feet water starts to spill into the Copper River Basin to the south.The USSR originally proposed a gravity-arch concrete structure with a crest elevation of 2,340 feet.Further work by the USBR,and the Corps of Engineers which included some site investigation,resulted in an earthfill dam being selected with a height of 410 feet and a maximum pool r-elevation of 2,300 feet.No reference has been found detailing the ration- ale for this design.A geotechnical investigation report (12)for the Vee Canyon site refers to a tunnel type spillway;however,this is not shown on F""the available plan. (i)Macl aren In the initi al USBR studies,a concrete dam with a height of not more than 100 feet flanked by earth embankments was considered.The concrete river section incorporated an overflow spillway.No engineering layouts are available. (j)Denal i ~The primary purpose of the Denali reservoir was considered to be the pro- t;vision of storage for regulating releases to downstream power facilities. As the mode of operation for this type of reservoir involves no downstream water release for several months each year,it was not considered feasible to install a powerhouse at this site.A 260 foot high earthfill dam was proposed.The spillway is a 19 foot diameter Glory Hole type with the out- let conduit passing through the embankment. 5-3 - (k)Butte Creek A dam at the Butte Creek site was consi dered by the USBR.A fi el d reconnaissance led to the rejection of this site in favor of the Denali site which was found to have better foundation conditions.No engineering 1ayouts are a va il ab 1e. """I i5.3 -Hydrology The following USGS gaging stations have been operated by the USGS: USGS Gaging Stations Gold Creek Vee Dena 1i Maclaren Talkeetna Period of Record 1949 -present 1961 -1972 1957 -present 1958 -present 1964 -present Obviously~the earlier studies were based on very limited flow records.In particular~the initial USBR studies had at most~two years of record.Extended flow estimates were obtained by correlation with long term rainfall records at Ta lkeetna. The most comprehensive study in which hydrological parameters are given for the various site is the 1975 Corps of Engineers report.Monthly flow data for the Devil Canyon and Watana sites were generally prorated from the Gold Creek using factors based on drainage basin areas.Flood estimates were derived both from frequency analyses of recorded flood flows and by utilizing the SSARR computer model to develop Probable Maximum Flood values.Table 2.2 lists pertinent hydrological parameters such as annual and monthly flow rates~spillway design floods and reservoir volumes for each of the sites. Detailed hydrological information is contained in Subtask 3.01 -Review of Available Material. 5.4 -Geotechnical ., I Geotechnical investigations at the sites have ranged from aerial reconnaissance to drilling pr09rams atWatana~Devil Canyon~Vee and Denali.A preliminary assessment of the seismicity of the area indicated tht the maximum credible earthquake for all sites is a 8.5 Richter magnitude located at a distance of ., approximately 40 miles.Available geological and geotechnical information is discussed in the 1980 Interim Report Task 5 -Geotechnical Explorations. However~for the sake of completeness~a brief review of geotechnical aspects pertaining to each site is included in this report. (a)Gold Creek Available information is very limited.It is known that a very deep cut-off wall of the order of 70 feet will be required and that construction material suitable for the earthfill dam may be difficult to obtain. 5-4 .. '1 ;:1, ~~;: - .... I""", i r [ (b) (c) Olson Available information is very limited.The abutments appear to be a sound graywacke format ion • Devi 1 Canyon Exploration performed by the Bureau of Reclamation in 1957 consisted of 22 borings,19 trenches and test pits and geologic mapping.The Corps of Engineers did a limited amount of additional seismic work in 1979.The significant aspects resulting from these investigations include: About 35 feet of alluvium overlying bedrock in the channel; -The abutments will require extensive dental work; -The foundation will require grouting; -Shear zones exi st in both abutments; - A buried stream channel or shear zone exists near the saddle dam location (to the south of the main dam); -The maximum Credible Earthquake was estimated to be 8.5 Richter magnitude at 40 miles or 7.0 at 10 miles; -Materials for a concrete dam are available in sufficent quantity but the aggregate shows marginal freeze-thaw resistance;and ~ r -Sporadic permafrost may exist in the left (south)abutment. (d)Watana Exploration of Watana has taken place as follows: ..... Date- 1950 -1953 1974 1975 1975 1978 1978 Agency Bureau of Reclamation USGS Corps of Engineers Dames and Moore (under contract to the Corps of Engineers) Corps of Engineers Shannon &Wilson (under contract to the Corps of Engineers) 5-5 Scope Reconna i ssance Reconnaissance and mapping Reconnaissance Ri ght abutment sei smi c 28 borings,27 test pits. 18 auger holes Sei smi c The significant aspects resulting from these investigations include: -·Overburden thickness varies from 40 to 80 feet in the valley bottom and 10 feet to 20 feet on the abutments. The river channel alluvium thickness varies from 40 feet to 80. -It is suspected that a buried stream channel incorporating an aquifer under artesian pressure occurs near the spillway location. It is suspected that a slide block exists on the right abutment. -The "Finger Buster"and "Fins"are pronounced shear zones located just downstream and upstream of the dam on the right abutment. -Re 1at i ve ly deep permafrOst occurs in the 1eft abutment. Sufficient borrow material is available.Although engineering properties of the fine-grained materials are not well defined they are known to be very sensitive to water content. Once the reservoir is filled the "warm "permafrost which occurs in the banks may will thaw and may cause local slumping. -Linear features located approximately 2.5 miles·to the west and 5 miles to the southeast of the site have been.identified and tentatively named the uSus itna Fault"and the uTa lkeetna Thrust ". (e)Susitna III The location of this site has not been firmly fixed and therefore no geotechnical information is available. (f)Vee Investigations consisting of thirteen borings and 16 dozen trenches were performed by the USR duri ng 1960 -1962. -Deposits in the river bottom are estimated to be 125 feet deep. - A buried streambed is located at the site of the saddle dam and could be as deep as the present Susitna River channel. Considerable amounts of talus and weathered rock must be removed from abutment areas to expose good quality rock. -Permafrost is present at the saddle dam location. (g)Maclaren Bedrock outcrops indicate a potential site.The presence of deep alluvium, particularly on the left bank,was reported by the Corps of Engineers. 5-6 -~ ! ..... -! I (h)Denali ,In 1958 -1959 the USBR performed investigations consisting of five borings and 14 test pits.Significant features include: -Deep permafrost occurs in both abutments; -Pervious sand and gravel occurs in the right abutment; Low density,potentially liquifiable,fine grained sands occur in the river bottom; -Layers of compressible silt are found in both abutments; -Maximum Credible Earthquake is estimated as a Richter Scale of 8.5 at 40 miles; - A deep cutoff excavation and extensive foundation treatment will be required;and -Impervious materials may be difficult to obtain. ( i ) (j) Butte Creek Limited information is available.Glacial silts occur on the right abut- ment and wi 11 require removal for dam construct ion. Tyone No information available. r- I 5.5 -Mechanical Preliminary project layouts showing the major mechanical equipment were develop- ed in the recent studies by the Corp of Engineers,and also to a lesser extent in the studies by the Alaska Power Administration and the USBR. The major mechanical equipment is summarized in Tables 2.3,2.4 and 2.5 and a brief description of the arrangements is presented below. (a)Devil Canyon The underground power house has four 194 MW units with Francis turbines (rated head -520 ft).Access to the powerhouse is by a 550 ft.vertical shaft.The units have bonnetted fixed wheel intake gates located in a separate gallery upstream of the powerhouse cavern.Two penstocks are provided and the intake has three stoplog slots with provision to place stoplogs at various elevations to permit water to be taken from different levels. The spi llway has radi al crest gates and bonnetted sl ide type low 1evel outlet gates.Wheeled bulkhead gates are provided for closure in the single diversion tunnel. 5-7 (b)Watana The underground powerhouse has three 264 MW units with Francis turbines (rated head -580 ft).The units have bonnetted fixed wheel intake gates located in a separate gallery upstream of the powerhouse cavern.Two penstocks are provided,one supplying water to two units,the other for the third unit. The spillway has radial crest gates.A high and low level outlet each with two radi al control gates and two bonnetted sl ide type emergency gates are incorporated in the spillway.The outlets are provided at two levels to .reduce the operating head on the control gate. Wheeled bulkhead gates are provided for diversion closure.Two slide gates are also provided in a temporary plug in one of the diversion tunnels. These are used for final closure of the second diversion tunnel. (c)Denali Dam Denali Dam,described in the USSR March 1961 report,has a morning glory type spillway with no gates,as well as a single outlet works tunnel with radial control gates and vertical lift emergency gates. 5.6 -Hydropower Table 2.6 lists available hydropower parameters for each of the sites as well as the parameters for the multi-site schemes developed by the Corps of"Engineers in 1975.As hydroelectric potential at a given site is not only dependent upon th~ site characteristics but also upon the degree of upstream regulation,the hydropower parameters are related to specific schemes of development. 5.7 -Environmental The majority of baselfne environmental information for the Upper Susitna River was acquired from U.S.Corps of Engineers Environmental Impact Statement Report (9)and the Jones and Jones (5)March 1975 Report. To faci 1 itate synthes is and presentation of the environmental information in this report the river is divided into 6 study reaches starting with reach A at the downstream end and finishing with reach F located upstream of Denali (Figure 2.2).Within each of these reaches the environmental aspects can be assumed to be constant for the general level of study at this stage.Major environmental features for each of these reaches are tabulated in Table 2.7 and are summarized below. (a)Reach A -Talkeetna To Devil Canyon Under existing conditions,salmon mirgrate as far as Devil Canyon, utilizing Portage Creek and Indian River for spawning (Figure 2.1).The development of any dam downstream of Devil Canyon would thus result in a direct loss of salmon habitat.It can therefore be anticipated that approval for such schemes would be extremely difficult to acquire. 5-8 :~ , l l (b)Reach B -Devi 1 Canyon to Watana The concerns associated with development in this section of the river relate mainly to the inundation of Devil Canyon which is considered a unique scenic and white water reach of the river,and dam safety aspects associated with the occurrence of major geological faults.In addition, the Nelchina caribou heard has a general migration crossing in the area of Fog Creek (Figure 2.1). (c)Reach C -Watana to Vee There are concerns which reI ate to the loss of some moose habitat in the Watana Creek area and'the inundation of sections of Deadman and Kosina Creeks. (d) Other aspects include the effect on caribou crossing in the Jay Creek area, and the potential for extensive reservoir shoreline erosion and dam safety because of the possibility of geological faults. Reach D -Vee to Mac 1aren r r l Inundation of moose winter range,waterfowl breeding areas,the scenic Vee Canyon and the downstream portions of the Oshetna and Tyone Rivers are all potenti al environmental impacts associ ated with thi s reach of the river. In addition,caribou crossing occurs in the area of the OshetnaRiver.The area surrounding this section of the river is relatively inaccessable and development would open large areas to hunters. (e)Reach E -Maclaren to Denali Environmentally,this area appears to be more sensitive than Reaches Band C.Inundation could affect grizzly bear denning areas,moose habitat, waterfowl breeding areas and moist alpine tundra vegetation.Improved access wou Id open wi 1derness areas to hunters. (f)Reach F -Upstream of Denal i This area is similiar to Reach E with the exception of grizzly bear denning areas.Human access to this area would not impact to the same extent as in Section D and F,however due to the proximity to the Denali highway,the inflow of people could be greater. In an attempt to put the above i nformat i on in perspect i ve,the reaches were ranked relative to each other in terms of biological,social and physical impact potential.This is summarized in Table 5.2. 5.8 -Generation PI anning A substantial portion of each of the previous studies has been devoted to generation planning studies and the consideration of how the Susitna development would fit into the total electrical system.The initi al USSR report showed that Susitna power would be required to meet load growth in the 1960·s.As the Susftna project was del ayed,fossil fuel pI ants were bui It to meet the demand. 5-9 In 1970 the Corps of Engineers showed the need for Watana in 1994 followed by Devil Canyon in 1998.Figures 5.1 and 5.2 demonstrate how the proposed development was to fit into the total system subject to medium and low load growth rates. As can been seen from these figures~the retirement of the existing plants has a pronounced effect on the timing of introducing Susitna power.By assuming the relatively rapid retirement rates shown~the U.S.Corps found that for load growth rates as low as 0.8 percent annually~the Susitna development would still be economical.Preliminary sensitivity calculations as part of Subtask 6.01 indicate that without any planned retirement of existing plants~admittedly an extreme case~the benefit-cost ratio for the low range growth curve would reduce to 0.75 as opposed to 1.4 with the planned retirement shown. 5-10 TABLE 5.1:DATA AVAILABLE FOR ALTERNATIVE HYDROELECTRIC DEVELOPMENT SCHEMES SITE (Pool £1.) Gold Creek High Devil Canyon (1750) Devil Creek Low Watana (1905) Mid Watana (2050) High Watana (2185/ 2200) Susitna III Vee (2300) Vee (2350) Maclaren Denali (2535) cenali (2552) Denali (2590) Butte Creek Tyone TOPOGRApHIC MAPPING** Y -COE* Y -COE* Y -COE* Y -COE* N -CoE N -CoE ENt 1NEER INt SUBSURf ACE LAYOUTS (Date)INVESTIGATION AIR PHOTOS - - r- I KEY: N: Y: APAd: COE: USBR: Ka: *: **: No information available This information may be available,but could not be traced. Information obtained Alaska Power Administration Corps of Engineers United States Bureau of Reclamation Kaiser Engineers Reproducible drawings Other than USGS 1 inch to the mile with 50 or 100 ft contours. 5-11 TABLE 5.2:ENVIRONMENTAL RANKING OF SITES ~pe of Biological Social River Section velop.Fish Wilalife Local Reg.Institutional Overall Gold Creek a M M M L X M-H b Olson a M M M L X M-H (Susitna II)b Devil Canyon a L L M-H M-H M M-L b Devil Canyon a L M M-H M-H M M (Susitna I)b Devil Creek a L M M-H M M M b 01 Watana a L M-H M-H L-M M MIb...... l'\,) Susitna III a L-M M-H M-H M-H M-H M-H b Vee a L-M M-H M M-·H M-H M-H b McLaren a L-M M-H M L-M M-H M b Denali a L M-H M M M-H M Butte Creek a L M-H L-M L-M M M Tyone a L M-H L-M H M-H M-H Type of development:a)independent development b)development with upstream regulation Type of impact:L:Potential for Low Impact H:Potential for High Impact M:Potential for Moderate Impact X:Potentially Unacceptable -1 "1 l''-1 ,-1 1 .).'J J. .... -1 1 ~·--···-l 1 ~-J I 4000 FIGURE.5.1 SOUTH CENT RAb RAILBEL T LOADS a RESOURCES MEDIUM LOAD FORECAST INTERTtE 1991.WATANA 1994 (REPRODUCED FROl4 REFERENCE 11)INTER.CONNECTED RAILBELTSYSTEM 3000 (J) «~ C).... Ul w «~:r~w 2000 WATANA (809 MW) ANCHORAGE ", "'.:l, '.) FAIRBANKS 2000'.•"(#.-".•'..~ 95 TIME IN YEARS 9085 0-.I I I i I I I I I i , I I I I I I I f I ) ~.( .) ~OOO \ " ,/~-' ( ;..~ '.~'1' 4000 ·,.t FIGURE 5.2 SOUTHCENTRAL RAllBELT LOADS a RESOURCES LOW LOAD FORCAST INTERTIE 1991,WATANA 1994 (REPRODUCED FROt1 REFERENCE 7) 'SOOO INTERCONNECTED RAllBElT SYSTEM C/l <1:1- (l)... Wet U1 ;:[~ I...... .J::o ,2000 DEVil CANYON (792 MW)" WATANA (809 MW) (J I N I W 1000 ANCHORAGE FAIRBANKS 2000959085 °t I I I I I I I I I I I I I I I I I I I i I I I 1980 TIME IN YEARS :,-"J ,,,-~,..J '"oje',J ,L;•.,.J ~.~"J "..J ",.~.I _. t "... - 6 -CONSTRUCTION COST INFORMATION 6.1 -Available Data The cost of development at a partic!Jlar site is dependent on whether that site is the first to be developed in the basin or whether it constitutes a second or .third stage of development.The initial development is usually burdened with the major proportion of the access and transmission costs and with higher flood diversion costs.For this reason the available cost data is referred to as being applicable to either an initial or a subsequent stage of development. The most recent cost estimates for development of the Susitna were performed in October 1978 by the Corps of Engineers (8).Detailed engineering type estimates were developed for the Watana (2200)and the Devil Canyon Concrete Gravity (1450)alternative only. More comprehensive cost information is incorporated in the 1975 Corps of Engineers report (7).This includes detailed quantities and unit costs for.the Watana (2200)and Devil Canyon thin arch dam (1450)alternatives constructed in that order.Also included are summaries of cost estimates performed on a s imil ar bas is for the fo 11 owi ng deve 1oprnents: -01 son (1020)subsequent stage. -Devil Canyon (1450)initial stage. -High Devil Canyon (1702)initial stage. -Low Watana (1905)initial stage. Low Watana (1905)subsequent stage. -Mid Watana (2050)initial stage. -Mid Watana (2050)subsequent stage. -Hi ghWatana (2200)sUbsequent stage. -Vee (2300)subsequent stage. -Vee (2350)subsequent stage. -Denali (2535)subsequent stage. Except for Olson these costs are given as summary costs for individual accounts such as Lands and Damages,Reservoir,Dams,Power-Plant,Roads and Bridges, Recreational Facilities,Buildings,Grounds and Utilities,Permanent Operating Equipment,Engineering and Design,and Supervision and Administration. Since the 1975 data incorporates the most complete set of alternatives,this information is included in Appendix C.For information the detailed cost estimate sheets and construction schedules from the 1979 COE report are also included in Appendix D. Some limited cost information is available for developments at other sites.It is based on relatively crude estimates performed between 1953 and 1968 and is not included in this report. 6.2 -Basis of Cost Estimates Both the 1975 and 1978 Corps of Engineers estimates used unit prices derived from bid prices of other major hydroelectric projects in the Pacific Northwest and Canada.These bid prices were adjusted to reflect the following: 6-1 Current price levels; -Alaska labor costs;and -Transportation costs for material and equipment to the site. 6.3 -Preliminary Ranking of Sites A11 estimates have been brought toa 1980 basis using the Handy-Whitman Index. Table 2.8 lists the costs for the various alternative developments as well as the years of the original estimate.It also includes costs per kilowatt and costs per kilowatt hour.This data is briefly summarized below.The sites have been ranked in ascending order of energy costs.The capital cost estimates include allowances for contingencies,engineering and design,and supervision and administration.They also include the main access road and major transmis- s ion faci 1i ti es to transport the power to Anchorage and Fairbanks. Cost ($) per kW Dam Site Capital Cost Dependable Cost ($)/1000 Rank (Maximum pool e1evati on)($x 10 6 )Capacity kWh Energy* ~ 1 High Watana (2200)1587 2300 57 ,; ,,;1 2 Mi d Watana (2050)1279 2800 59 3 High Devi 1 Canyon (1750)1846 3100 66 4 Low Watana (1905)975 3900 75 5 Devil Canyon (1450)1042 5000 84 The ranking of dams for subsequent development stage (i.e.including the cost of the main access road and major transmission facilities)is as follows: 1 Devi 1 Canyon (1450)630 900 22 2 I~id Watana (2050)916 2000 42 ., 3 High Watana (2200)1221 1800 44 4 Low Watana (1905)613 2400 47 J 5 Vee (2300)696 2300 58 *Based on an assumed annual cost factor of 12 percent of Capital Cost. The above results should be regarded merely as a ranking of currently proposed developments and not necessarily as being indicative of the most economic schemes to meet future load demands.To accomplish the latter requires additional studies aimed at assessing the best methods of staging development to meet a range of possible future load forecasts.Such a study should also incorporate a review of the potential at sites for which currently very little information is available and should incorporate the environmental impacts associated with the various developments. The 1979 COE study involved a more detailed assessment of the capital costs associated with the Watana-Devil Canyon dam scheme.As indicated the Devil Canyon costs were based on a concrete ground dam.These estimates were updated to 1980 levels and are listed below: 6-2 - :",." Dam Site (Maximum pool elevation) High Watana (2200) Transmission Facilities Devil Canyon (1450) Total 6-3 Capital Cost ($x 106) 1590 371 914 2875 -. BIBLIOGRAPHY 1.Al aska Power Administration,Devil Canyon Status Report,Juneau,Al aska, May,1974. Alaska Power Administration,Inventory Type Calculations for Some Potential Hydroelectric Projects in Alaska (Working File). The Federal Power Commission,The 1976 Alaska Power Survey,1976. Henry J.Kaiser Company,Reassessment Report on Upper Susitna River Hydroelectric Development for the State of Alaska,September 1974. Jones and Jones,An Inventory and Evaluation of the Environmental,Aesthetic and Recreational Resources of the Upper SusitnaRiver,Alaska,(Final Report prepared for Department of the Army,Alaska District,Corps of Engineers), Seattle~Washington,March,1975. 6.U.S.Department of the Army,Corps of Engineers (Alaska District),Final Environmental Impact Statement,Hydroelectric Power Development,Upper Susitna River Basin,Southcentral Railbelt Area,Alaska,Anchorage,Alaska, 1977 . 7.U.S.Department of the Army,Corps of Engineers (Alaska District), Hydroelectric Power and Related Purposes:.Southcentral Railbelt Area, Alaska UpperSusitna River Basin -Interim Feasibility Report~Anchorage, Alaska,1975. 8.U.S.Department of the Army,Corps of Engineers (Alaska District), Hydroelectric Power and Related Purposes:.Southcentral Railbelt Area, Alaska Upper SusitnaRiverBasin -Supplementary Feasibility Report .... 1979. 9.U.S.Department of the Army,Corps of Engineers (Alaska District),Revised Draft Environmental Impact Statement,Hydroelectric Power Development,Upper Susitna River Basin,SouthcentralRailbelt Area,Alaska,Anchorage,Alaska, 1977. 10.U.S.Department of the Interior,Bureau of Reclamation (Alaska District), Devil Canyon Project,Alaska:Report of the Commi ssioner of Recl amati on and Supporting Reports,Juneau,Alaska,March 1961.(Reprinted MarCh,1974) 11.U.S.Department of the Interior,Bureau of Reclamation (Alaska District), Di stri ct Manager's Reconnai ssance Report of June 1953 on Susitna River Basin:A Report on the Potentiali Development of Water Resources in the SusitnaRiver Basin of Alaska,Juneau,Alaska,1953. 12.U.S.Department of the Interior,Bureau of Reclamation (Alaska District), Vee Canyon Project,Susitna River,Alaska:Engineering Geology of Vee Canyon Dam Site,Sacramento,California,1962. 13.U.S.Federal Power Cormnission,The 1976 Alaska Power Survey,3 vol.,1976. - -- - r APPENDIX A PROJECT LAYOUTS APPENDIX A LIST OF APPENDICES PLATES Author Title USSR (1953)Devil Canyon Dam and Reservoir -Location and General Arrangement .••.••.••.•.•.•..•........•.•.•.••.••..•.••.•A-1,... USSR (1960)Dev i1 Canyon Oem and Power P1 ant -P1 an View A-2........... USSR (1960)Dev i1 Canyon Dam and Power P1 ant -Sections .............A-3 APAdmin (1974 )Dev i 1 Canyon Dam and Power P1 ant -General Dam Site Layout .•.......•...•..•.••.••••••.•..••••••...•.••.••..•A-4 Watana Dam -Detail Plan ••••.••••••••.•.•..••....•••..•.A-18 Watana Dam -Details •..•.•.••...•••.•..•...•.•.•.....•..A-21 Watana Dam -Saddle Spillway and Penstock Details ••..•.•A-17 Devil Canyon Dam and Power Plant -Dam Elevations and Sect ions •••.••.•.•.••...•.•.•.•....•.•.•..•.•.•......•••A-5 A-22 A-19 A-20 Vee Canyon Site -P1 an and Center1 tne Profile Watana Dam -Profiles Watana Dam -Sections Dev i1 Canyon Dam -Detail P1 an ..........................A-7 Dev i1 Canyon Dam -E1 ev ation and Sections ...•.•.•.......••A-8 Dev i 1 Canyon -Site P1 an and Explorations •••••••••••••.••A-9 Dev i1 Canyon Dam -Concrete Grav ity Dam Detail P1 an .....A-10 Watana Dam -Detail P1 an ..•••.•..••......•.......•...•.•A-15 Watana Dam -Sections ••..••••.••••••..••••••....•••••.•.A-16 Dev i 1 Canyon Dam and Power P1 ant -Power P1 ant P1 an and Sections ...•....•.•.........•..•..••...•......••..•.A-6 Dev i 1 Canyon 0 am -Concrete Gr av i ty 0 am Elevation and Sections ...•...••.•...••.•...•...•.•....••A-ll Susitna I -Site Location Plan •.•...•.••••••......••.•..A-12 Susitna I -General Layout •....••.••.•.•••.••••••••...••A-13 Sus itna I -Sect ions ..••.•••.•••...••.•.•.••..••••...••.A-14 APAdmin (1974) APAdmin (1974) CaE (1975 ) COE (1975) CaE (1979 ) CaE (1979) COE (1979) ~I Kaiser (1974) Kaiser (1974 ) Kaiser (1974 ) CaE (1975 ) CaE (1975 ) COE (1975 ) CaE (1979) CaE (1979) CaE (1979) CaE (1979 ) CaE (1975 ) APPENDIX A LIST OF APPENDICES PLATES (Cant1d) r- Author Title USSR (1960)Denal i -APAdmin (1974 )Denal i COE (1975)Den al i - Page Dam Plan and Section A-23 Dam -Plan and Sections A-24 -Site Pl an A-25 -1 JlII!iJlIl, ., A-I ..; 0:g 0:... VI ~ - - - ~.. .. I a!!.. ~•Ii! a ! ".. '"... lC .. ~~H.,~"t .. ;).~ ~.. ~.J t= ~ '" A-3 a;::::.. A-4 ~~iEi=IIIC"'a::Z ...-(I)111-;z:Z...-1&.200C"'a::ZIIIIII~2 0t:a. ~C 111:11: 00.C U)..J :i C \ Itf-§Z l-e:(::)...J 0Q..~>-8a::<l<l •a:~1&1LL1,..JlaJC3=ZUJ u0laJl-enQ..C)-~en 0 :E <l az0 e:(a I I /~{( \\\\'\ \ .. .~ •••II: 1 "}..~-'1 "'~··.·l 1 1 ]-.~cl 2-1/2I t_ Ma~:1.W.·El924I.r-:.L::rei?.7 JUS _.«'SS"·"·~i :r 4 units operating I unit operating Section through earth dam ....".- Section through penstock and powerplant 20~6"Dio. penstOck Et.1455 Section through outlet worksSectionthroughspillway Ma~.toilwoter el.925__l __ Top of active conservation copocitr-el.1450 \ Ma~.water surface el.1455 \ I-"""""'mll . Wheel'mounted gate ~~- Top 01 inactive copocitr·el.~.l' Top of dead copocitr-el.I081 ');:0 ,',I u1 DAM ELEVATIONS AND SECTIONS SCALE b-100 200 300 400 =;)b Ft. DEVIL CANYON DAM AND POWERPLANT U.S.DEPARTMENT OF THE INTERIOR ALASKA POWER ADMINISTRATION I1nstock inloke slructures Metol trosh rock Upstrea m elevation Developed along axis of the dam Original ground suFfoc,c.::,- 'II Assumed line of- uco.olion I_Reference plan, Top 01 embonk~nt·el.1461;:>~ThrU$1 block i Top of dom.'1.1455jj Top of parapet·...1459,__- 1<::::1 iii i i qill"._'iii ii'l_zj$f FIGURE 6 APA 2-74 FIGURE 7 U.S.DEPARTMENT OF THE INTERIOR ALASKA POWER ADM I N I STRATION Plan fl.901 I Plan fl.891 i Plan £1.811 DEVI L CANYON DAM AND POWER PLANT POWERPLANT PLAN AND SECTIONS SCALE...,......doZO'10 60 eo 100 120Ft. General p'lan Section 8-B L!!YYJ~.nded_!!!!.Im...I!W!!tlive cellina~ .......fHlM_.---j ~....:t."-.i~I'~$-.....__...n...!!.?9__._.._.._.••........'..".....'-r __.3 • , .V Suses'~~~~--..,-~..............=---= ...·---·----385-0 H.V.Power cable tunnel ='~ I .. .~ I '" lJ>ngitudinal section Seclion A-A Transverse section through Ci of units APA 2-14 .~,,~,;J.L.E 1«I,;,,,,,,,,J9a.C4~,,,;,.,"J '.."dE 8-5,:·.;",4 ]""--1 e~-1 ~.,-~-1 -~1 l -J )'----]J r':~.:.I~'"/~.:'~"t·'" ij........I...... ...t«'I"D"lrn.'"r ,"H'.ptfU.f"tl'::3..J- .(llO13 _C"""""~·"N' '-';" .ot f. ...t'.~,~~...".." AIr .....,...-....,'.:; S£CTDf /.'•.,11'",..,...,....."...,,.. ,(fll'".J-1vt..,".~~...-'....-, /A."M .. "1 .6tJTlON T"ltU 'oM""""It"'""""1'-.1]0' t ,,-.,.,..,,u.Mt I'.......,r-"••-,.".. -l,..__'.-nI ...,..,.,.,.-."..,If,-=::::1.k"":;c+.....-.....,..,.... PUtt .~(:"Ol/l rHItU ,.~".rQGIt AND 1-0"'6«"..~ltIr ,sn;tloN lOW lCVEl $LUOCC /lCT.1LIO.IOI.D ... I , •Kl.".,J,nJ.'I -.... - 1-",«1,.".,-.... .. 1MQ1QIl..............' IlECfNIER 'llllS I I I oN'olG _~ S/'/llJl"Y SECTION ALASKA DlSTIIICT,COllI'S Of ENGINEEllt ELEVATION AND SECTIONS SOUTItCENTIIAl IIAILIELT AIlE'"ALASKA INTER I"REPOIIT NO.I UPPER SUSITNA RIVER BASIN DEVIL CANYON DAM , ,..1" ,~..',,,"I ,,, ~::"J.~" "JIM .~~~ ....,.. !.!!!... i'.".,~" -'!L....itio sPILL"'",stc;rlON ....... GOD .to.....I·,~...,rtII·. ., i tl.1t(;H LAYQUT QA'. -CIIQI(I r 1.-._ _1'11""-....._,.. ...,- ~",;~.....----~ ....,.J.. UI'.rIt6t1UI ,..ev..r/o~"W."'".&..,....._"ti'....i11 ---,,/------' --,-..-, I/h,,/\ /\";/-..J...--.II''',~_''''''''''''tf/C"~,>:t.-:••, - :;=-l..••.......1-- I I I I I •--...DIVERSION TUNNEL rROF&' 1"'~l'd""'i,""»-,'\it '-'M""".,,,, or ,or .,. 'U~I ..tll1 ::r> I 0:> fiLE lIo.i-sOU-VZ-04-OI APPENOlll I I'UlIt _ )::> I 1.0 ,,\ ''''c-"\ '" '".. ." oC. '".., SOUTHCENTRAL RaBELT AREA.ALASKA s.>PLElCIH~fEASlllIUTY SfWI' UPPER SUSITNA RIVER BASIN DEVIL CANYON SIT£PLAN Il "XPLOR4TIOliS .....AIIlA b1StIlICT.CORP'"~En a..::IIJIIII_•.ua& .J~~b\=J--L''''''.~''L",~Im-~~~-j --J '-1 C'1 e-]}C'C"l -----1 ,....".-_..~,,-)1 e'l "'1 """1 -'~"J t--.-c J ; (SWITC~Y4RO£L.) );:> I I-' 0._ ~~\ -----...\"- \"'/' //::>:>~,.,!\ '..").\~)~~,))// .~...------'. -'-~~~<":'~;~-~'>:~:-:--~.~~Ld~/---/1--_/'~-~-J---~//---//" ?ii~.~::~;l---- ,~.~-->~"-y /.<.-I ~.:'-;::'/~:C'---- ;',_':---;/..'',~_>_._----:__:~./~/:~,/;r--:/--/---:,_ ;--~/'-/-----------/--~~.,-//-~r-.....::.·'SW1TCI-iYARO'//~_~':\,,~---'.//,.-_/.-;//5)'~ACCESS R.O~.O ~/~/', :./_---...---./"____.-----,...--//~-[4C1-"/l "--"/-==-.---.--"//'./;:;c-_/~////"-~1 / I /(G'-~<-::.::::::=.>-;::::..--//,'-.//,,'//C/-,-,,<.::--~/...-;:c.--.-L;.'~J ,/",~,/1 (v--.::::->,,--~..:.,~-.......-///".if;//-~/ I J /~;.---~-.~~_-.~~-_/---'-.1490---""/., "" '",c. \s-.I ....~-,u.:.•.('~_~··o· ~-_·~.":;_zjj~~~';,,~~·...~~.,_:~..._:_:."; ~E,~~!~~~~+~~ ~·-,.oEVIl.CANYON 'OAM '..S CONCRETE~R~ITY'D~M~,'i;~ f~~~~~$~iJ .PLATfil4' "'SSUMED TOP o~ROC~ IYE!CALNON-OYERFLOW SECTION '!..J l'., tuPlIC.utl'\OOW_o" SPILLWAY SECTION ~r T 'r ~ CREST E~.14,2.S AXIS D~DAM SECTION THRU PENSTOCK AND POWER PLANTSC~E:''''Iod fI.;:f~§~";. 0.71 II": E~.1455 IW!IL li~itl i?i~! AlG$OF DAM -_IQ&.['r~IOO"O~ SOUTHCENTRA~RAL'E~T AREA."'~"'SU SlI'PJ.EUENTAL ~EA5181L1TY STUD\' UPPER SUSITNA RIVER BASIN DEVIL CANYON DAM CONCRETE GRAVITY DAM ELEVATION AND SECTIONS PEVIL CANYON AUXILIARy EARTH FILL-OA.t!L- ltd rI ....,.lee • •I.0l"Il:te,loLI',_Itd·.. o P'INE FILtER '""'Ar&.'::--I~;77r~ zOo " 400 "_/,' 160 liuj!LJI/"'NTA~E r~.1110 .bo I I I DIIlll IDIIm Hioo UPSTREAM ELEVATION DEVELOPED ALONG It OF DAM SCALE:1-.1001 .2001400 LJ .M"'X POOL a 1451 1'11"\ /.i '--\ ~\ I ' -//-.....-----/\, -----."1/", 8..915 ¢---\.."\,II~ ""-" 26'0'....OI\lERS~.A. TUNNE."LJ "'SSUMEO EXCAVArION ,/ ( ~~~:5 WAI~t!:(1.833.1 C 21 '01....{.'JJG SECTIOH .dt £t.841 :,",,_£.I........HL- ~ I-' I-' o\I.oUU Dlnllll!CT.alIIPS at 1DIIICiD'1 DIVERS ON TUNNEL PROFILE j ...,_....AUO<ASCA~r:""00'I 4,,",,",r"","":'."r ":..",,:""'::'<:"."","",'""'.."::"~£R"R,(19'.,.:.''':0,~,,J-'4~,,,I---,",,,,,",,,"...l-bL.i'';~"v4::,.;,..;J--'':.(:';''':'~''''!i:';':;"I-J~!i;""_·"";,,".:J·-"""0;,,j-·<.;:.,',,;.)---"'G:,,,:s;;,:J--i."':.J"J;---4,,,,,,:J-,,,,,,.,,,,1-"h~"-'~::iJl.,"J-"~.'5.:d:lpLATi~iI"ti;•• •.. ~ 2 2 z<...I II z ~ ~<;I ~ ...I III on t: a •r• •!! of ", • ..o..: 7 L .... • .. ~ .. It..•,.. -- •'/..(/•,/ •'1'•11/j - ,"",'i """,!•..• •·• I""~ " c•• rot a i •11/ t- C....... ,11/ A-12 \ '. "\ \ \ \ A-13 -I I 8.it --+-il--l---4 8! ;. I ,:,8_.t---i Q j I II . I ! .1-_.__II I I 8--...-1-f--t-'-H--+i --+--t-r---H---':~-+!.... ~+ , I i I" i !' I i "-,I .I I !iII §g 8 ,1 i...... .1..11_N'1'04"'.1..........,, o .. :saIII i I P I :8,+ I !t I I I ! I I~t • I J I I'I!!! ~\I\;~~--'~\IIf"~fEi=I r\I'i \.1/I f-- f-- f--I 1\f\._- r-...'f--'-- ~~o a,..----+----+--+--+i •... !""" ("""" 1"""'" ]1 A-14 vi' ,#' ,I'- ~ ~,,<p~1 ·0 () --toO .."If •~..-- II'farq'.."" INTAM£STRUCTlR£ M'f'R(;ACIi O\IW£L Co ~l.£ u:J L--.........J TYPICAL SECTtON APf'R()AC.H CH,AN£l 111111n: L f~"CQIIIfOUltS wI'"1...r_,... ....,••10'0'''''''"IULi I:U,MO. ra_1I ffll.WOUNfa.NS 10-'41.......Sd. YfltnCAL ClafUM It WUN SU LIVIL illll.I.L.1 I.fHlAl ur ~."ow"IEI,rI..'1"~,IIllllNII ca 1"",1 ........,-1. '''"ttl NO.1:;"'..~~~=-UPPER $U$ITNA RIVER BASIN CAJII'tON ONDTt )• /WATANA DAM iOIt£A.CAPAO".·AU)~LL"AY DISCHARGE CtFJ£S .------~~~I "l'•':'"DETAIL PLAN _____-~"'J ~""'-IG'"'ALASKA OlSTRICT.CORPS Of (~GIN£[R' fJ~MIIICMOfI:alilt.k.". I--•..."....,1-----<-,J--',J-----;-J .-----~-~~"<A<J!=;j~..-....i'...'..~,~t--"'d:...J-'-I'~",.,\8,,8''',)-'''''''_'"''_"'"~.J-~,.I-'",$~••;J--~"-~,...CC__•.,----",--~-\Ct.ti;;-;-':''mtd2-o4~Pl'A'lt~·J.",~",-J ttiitl II I" i''''''''''IJ H 111L~~~'".4C'''1 N..J..-1 I :lnII l.oW j ,I 'l~sPLu,,",Ill!lU"K.t: ;-'ti1\..'iIUO £" ~....,"'"n~JT ~,j I W litO HOO '~+-rtIIi.AttUltHiDIIbIXI '"-H-'ii ' ,•.,iii I '".I''I'·,\''j'G$l()lUl(i(l,;&PIIICl'...f.'....l.1OM 1£.fU -I $0 IJI)eo_n.o xo iPII..1..f IJI~l1li fHQlSo.tJC)S CE C.,,I. :r I-' ()"I 1 '-~~~'-~~J .-1 r~]''-1 1 ~-'.""'],')1 l]....~1 .........J .-]•" "OIL L<._--.._-.>..-""\ .....- ./011- -- ....,- ..,,-i ~ '100-3i ~I--~ ,.,.- .,...til- nN ".... ......"•. Fr"...., COFFERDAM-DETAIL "A" rrPlC.L eACH slD£ ~ , I "'"'00 I I • • JOO IfOO ~600 I I7<,....I I I ;oQ 1000 1/00 ,~oo '':'0 11f~,,'00 ~11~';00 ~l~I .tJ~2:00 ZJ'oo 1:00 ~z~Zl~Z~CJ()it'oo ~"'~~~J~~~~ PlfTAtiCE'IN FFEF MAXIMUM Scr;TION OF IVATANA DAM :t:> I ~I H«>'- "'""""}:!~ ~~-----I ''''''~,~~ Do. SECTIONS UPPER SUSITNA RIVER BASIN WATANA DAM I I I JJOO »00 »00 SOVTtlCEHTItAI.RAllBElT ARE.,4L.SK4 INTER."REPORT NO.I I I I I I ZfOO "(){J 1100 .fioo JaOCl J'.... flwclfW PII, -~~~]~(1~'60 I \r:!"P' ·\J-r.lli/O tEi.lOGO t ..-.....1«1...... ~I-IllI.;:H:.:.lW~tl'!I·_mol.~~gtJL H~'t1 J -E1i960 -{Uj!fO il':1U1~~ I I .2400 1500 I....I J ZIOO flOO I'0"" ,. "00 ,,"" , 1700 , "'" W$"CI.H70 DI5tA'tCC 111 Fetr "00.."""IIS"". """ , 1<00 I 1000 I.""I .00I ''''' I <DO ,...,..,.,, "'".to "00- ,,,,,,. --"""- lOGO' ~ !1100 .. ~ ~/lSOO""~ ~'000- WATANA DAM Scr;TION A-A (FROM /I'8J INTAKE:STRUCTURE LOOKING DOWNSTIlE:AM ALASKA DISTRICT,CORPS OF ENGINEER' '-HafJA.lG[."l'JU, JUNE /!In FilE NO.Z-$OU-n-04-01 PLATE 8-9 I JUliE 191~J P£NSTOCIr I[PROFIL.e filE IIO,Z-SOlJ-92'04-01 PLATE &-10I',;or TO SCA~,._-.....,~_. ........I»tTRlCT,CIC.ll'tPI Of PlIMOI ~lCIIaIIIt,"'-"" SOuTlICENTRAl IlALIELT MEA.ALAIKA SlJ'PLEMENTAL FUS....ITY STUDY UPPER SUSITNA RIVER BASIN WAT.NA DAM DETAIL PLAN -r---: WATAHA PADJlECT DISl:HARGE C_SILITY DURING EMERGENCY .lllU'WDOWN. ALL GATES FULL OPEN KIIH LlVfL ~n.CT NOInIAL I"QQL n ..... I r!~~1Jt!Lfi,f~o:'I , . . a.o,OCIQ .0,000 UIO,OOO 1:10,000 140.000 1.0.000oINCFS {IQP:IO ad-OliO ~JDOQ L:'~~~;:O·0I1JoOo-----.oAGO 10 ,...:il" WATANA '.-I 1".....~~:~ION"••",1 GUlhE! 1"00· "OWElI !"LAIiI"3:.116111 UOO .,.00 "00 .,GOO 1.1-00, NOTES: I.TOPOGIlAPHI(;CONTOUIS _lASED ON AERIAL PHOTOGRAI'I1T DATED 10 JUNE 1575.VERTI<:AL DATUM IS MlAH IlEA LEVEL 1M au T. :J.. !..... ! I:10 <:l W 3 :I:.... '"<:l lIPIl.lIIIIliy ~rlf 1,141" )1 <-1--c --J 1 ~.-----')~--~l -1 --~~I -1 -1 -~-l 1 -J -I -1100 ~ ! -'800 B j III -1700 ;;f -2200 -'800 7.4 00 -'.00 -~ I '600 I 1600 , 1400 SNIf1(GRAVEL ~ ...-L--e'(OFFERDAM11/,sic DETA'L Al I 1200 I 1000 COFFEMAM-PETAIL A TYPo EACH S'Of; v M'N'MUM POWER P06l.EL 1940 ROCK LINE I 800 ..~ ./........".......~::..."-2100 ,2'COARSE FILTER "---••,u~) 1 600400I 200 l WrlCREST WIDTH! I -MAXIMUM.POOL £1...2185 I I 200 0 DISTANCE IN FEET I 400 , 600 .& eOo (•.~) , .000.200, .400 -C ~r-It COARSE FILTER COFFERDAM ISEE oETA'L A) ::P I t-' 1.0 2400- TYPICAL SECTION 3foo, 540D , 3200 IOUTNCENTUL IlM.IELT _.......L....K... s.PI'L£lIIENTAL FlASIllUTY ST_ UPPER SUSITNA RIVER BASIN WATANA DAM SECTIONS , 2800 , 2600 t,P'~'~\~~~~'1 t DIVERSION TUNN£L .i'~~30'D1A.(NOT TO SCALE)' • + , 2400 , 2200 , 2llOO -, .BOD I , .4DD .600 DISTANCE IN FEET , '200 RETAINING WALL --POWER INTAKE STRUCTURE , lDOD , BOD800 STRIPPED 'YO SURFACE OF ROCK 400 GLACIAL TILL· 1900- _1800-..... ! m 1100- ~ ~1600- ~,=0<)- 1400- ,I 0 200 2300-~1 BRIDGE PIERS 0 105' --~~~.----'lflrrf1l~==:-~~~!lA~MCR!llI.EST.!LEL.~2'9'__._~~~~o.-----.,~~i !_;,b'''U'~- =-._--~~-~ WATANA DAM AND INTAKE STRUCTURE LOOKING DOWNSTREAM 101'r 101'ICII'h •'I ......c.c...r.(.rM/'" ,........lnneT,f6 .-.. &lCtd ...... FEBRU ...RY ..19 PLAT!1-5 NOTE: THE HIOH AND lOW LEVE'"'H&K1f I1....CTUllIl ARI:PLQTTIO AT TWICE HORMAl lCAll rOIl tt.....atn. ~NQRyA!MAlt fOOl £1 EY 210$ -2200 -2100 ~..==.~'{3"=:~~I"IN\I.1El..14tO _~~=-fd !:L ::.-=:to'DIVERSION TUNNEL~~-El_I"lt60I~,~,':.,,-'..'E pLUG PROFILE LOW LEVEL OUTLET a DIVERSION TUNNEL.2 ,... -2000 -t,OO -1100 -1700 -1'00 -1100 -'0400 ., DIV£"SIOtf~o£L I~TAtcE SIRUc;tURE "" LOW LEVEL INTAKE STRUCTURE I~,~I~ ~ ,b,~,~a\;,~lo4.J.J.l.Jo ......-------.... .//'/' // /'/ J,J•.~ /EXISTi,.G GRQl.INDY .../..../ // I••,10 '''''' :x:- I No ....-...Of,TllItel,PPI 0fL ~DI .....WQII...au.:a SOUTHC£NTRAl.RAIl.IELT AREA,ALASKA 9.f'Pt.EMENTAL F£AS1lllUTY ITUOY UPPER SUSITNA RIVER BASIN WATANA DAM PROFILES __l'IO&I'III,iElf _~ICALI'I"nll l _~";:_If T t if ~r Iftll)IZ: -2200 -2000 -IlOO -'000 -,"" ~1700 -'00<>DIVERSION TUNlWEL I'INUKE SfkuCTUitE '......-Ie«! I " I..I II f 20 I " I..1•• ~INV ~(.1l,l$O -....................,EL 195~-....... --- I,.I 30 I..I..I..I.. PROFILE HIGH LEVEL OUTLET a DIVERSION TUNNEL ". I • 0 I.,I•• .//'.----, >...././ EXISTING GROUNO~.r// / // /. I••I••I 00 I.. 1'0'It // // ./ // ./ ~~•.,••JL~.............,.,Tv•••L ~:::::10'p'."SlQ!j !IIN••~1t:=::'J ';.LJq,O, ---•-UG-•FlU.VALVI SEE Di:TAll 0lIl PLAn 6-1 ~,~",,]-~.;.,,;j---C....;...J-L:"..,2"')-~',".6'.~~~"'·S]-Z 0'i.~,..~";;.I-l...,.~.,,,,J-,,",.;J-~''''~--;(;L.~J-il"'0,";J-Z;:...)-[("",;~I-L.,.....•~.;~~~~~iRY 197~~....,".I;LAT[;";:;"" --1 ~-,----I --'1 --,,'-'I 1 c-~-l -1 1 ]-~~-l ~-~1 C"I "°'-1 r~'._)•••._-" ..... ·30'Dl.VER9IOH .,......L .....!:,!!...~...0:U DIVERSION TUNNELS *1 AND"2 INTAKE STRUCTURE PLAN "EL 1485 HIGH AN>LOW 11Ei INTAKE eLAN' I\ILKMlMl SlOT )::- I N l-' .. ~~'.' _,dDlVfR5IOW T1JIiI«L ,,'J 1.£.1410 I I I I [~~tli:~1 I I ~~~V~T:(~~~~rkt:: "LV ----------..j --i• (TRASH &AM --/"/ -p*~;(",~ ,./zoo'l .'="'------- t~Ufu PWG AND FilL VALVE DETAIL NOT TO SCAlE PIVERSION TUNNElS ..1 AND.2 INTAKE STRUCTURE ~HIGH AND LQW LEVEL INTAKES SECTION SOUTHCENTRAL RALBELT AREA.ALAS" !U'PLEIlENTAL FEASMllUTY STUD't UPPER SUSITNA RIVER BASIN WATANA DAM DETAILS ALASM,A D111l1tCT.CI;lItPt ",INill!IJtI ..11I:101.....&.-.. FElIRUARY 1878 PLATE a·a 1------'1~ y~ ·Qo·.·.~!:~~8 A-22 ,~,{\.\'!.III.,,,,!!iI - r [~~~...j....LJl!i~w...wJI·ti ..tt~~lAU~~,ti'r.~~~-N~.lJ ...fi~~~.J.+-,.c::;.bJ::::.td f~rv""''-'''M'''''.''''''''''"'I -i '" '\l ~ ~1 l.. i " 4 .... ,~i .:1.""i,~~.~- ~~... .)~~ f\~~ ~~~-i~....,-'-~. .. £1.2304 o 00 200 400--600 1!J~-KiOO'..I ~.l piling TW.E12S Gnd trow.1 Section scale Maximum section Section through oullet works Section through spillway GQ1,chamb.r Conlrol "'0"'.SUllim;z bolln~,.\,.,..,'£.·:JF.~.•~\EI2358l",,--MOL TW.E1Z352 ::t:> I N..p. General dam site plan Scole o 200 600 1200 111.. U.S.OEPARTMENT OF THE INTERIOR ALASKA POWER AOMINISTRATION . DENALI DAM ---------- PLAN B SECTIONS -."J ,~>-~~---I ~."..o._]"_.~c<..1 .J ~_~.J ""'~-""]:~,~..-_I i-(I .Ir -I A-25 ,.... I i' 1"""' ,/""'" APPENDIX B CORPS OF ENGINEERS (7) CRITERIA FOR EVALUATION OF ALTERNATIVES - ,,-1 fl"I'IIIl I I""" I rVAlU~TION OF ALTERNATIVES Selection of the best plan from among the alternatives involves evaluation of their comparative performance in meeting the study objectives as measured against a set of evaluation criteria . .These criteria derive from law)regulations)and policies governing water resource planning and development.The following criteria were adopted for evaluating the alternatives. Technical Criteria: The growth in electrical power demand will be as projected by the Alaska Power Administration. That power generation development)from any source or sources.will proceed to satisfy the 9rojected needs. A plan to be considered for initial deve10pment must be technically feasible. National Economic Development Criteria: Tangible benefits must exceed project economic costs. Each separable unit of work or purpose must provide benefits at least equal to its cost. The scope of the work is such as to provide the max imum net benefits. The benefits and costs are expressed in comparable quantitative economic terms to the fullest extent possible. Annual costs are based on a lOa-year amortization oeriod. an interest rate of 6-1/8 percent.and January 1975 price levels.The annual charges include interest;amortization; and operation.maintenance.and replacement costs. Power benefits are based on the costs of providing the energy output of any plan by conventional coal-fired thermal generation. B-1 ..... ,...., -, 1""." . I I_nvironmental Quality Criteria: Cunservation of esthetics,natural values,and other desirable environmental effects or features . The use of a systematic approach to insure integration uf the natural and social sciences and environmental design arts in planning and util ization. The application of overall system assessment of operational effects as well as consideration of the local project area. 'Ihe study and development of recommended alternative courser of action to any proposal which involved conflicts concc'~ing uses of available resources. Tva lua t ion of the envi ronmenta'l impacts of any proposed ~ction,including effects which cannot be avoided,alternatives to proposed actions,the relation- ship of lpcal short-term uses and of long-term producti-' vi ty,and a determination of any irreversibl e and irretrievable resource comnitment. Avo;Jance of detrimental environmental effects, but where these are unavoidable,the inclusion of practicahle mitigating features. Social Well-Being and Regional Development Considerations: In addition to the basic planning criteria,con- sideration was given to: The possibility of enhancing or creating recrea- tional values for the publ'ic; The effects,both locally and regionally,on such items as income,employment,population,and business; The effects on educational and cultural opportunities; The conservation of nonrenewable resour~es . B-2 r i - APPENDIX C CORPS OF ENGINEERS 1975 INTERIM FEASIBILITY REPORT (7) COST DATA SUMMARY COST ESTIMATE .fI""JANUARY 1975 PRICE LEVEL WATANA DAM AND RESERVOIR 2200 FEET NORMAL POOL ELEVATION (FIRST-ADDED) r-FEATURE ACCOUNT COST NO.ITEM ($1,000) 01 LANDS ANO DAMAGES 16,392 03 RESERVOIR 9,180 04 DAMS 479,775......Main Dam 194,172 Spillway 57,665 Outlet Works 44,544 r--Power I nta ke 123,298 Construction Facilities 60,096 07 POWERPLANT 439,238 ~Powerhouse 67,229 Turbines and Genera tors 50,649 Accessory Electrical and Powerplant Equipment 11 ,121,..Tailrace 47,287 Switchyard 15,717 Transmission Facilities 219,600-Construction Facilities 27,635 08 ROADS AND BRIDGES 48,875 14 RECREATIONAL FACILITIES 39 r-19 BUILDINGS,GROUNDS,AND UTILITIES 3,565 20 PERMANENT OPERATING EQUIPf.1ENT 1,800 30 ENGINEERING AND DESIGN 39,638 31 SUPERVISION AND ADMINISTRATION 49,498 ...... TOTAL PROJECT COST 1,088,000 fI"": !""" Table B-1 v ,.....Appendix I B-20 C-l SUMMARY COST ESTIMATE JANUARY 1975 PRICE LEVEL DEVIL CANYON DAt~AND RESERVOIR 1450 FEET NORMAL POOL ELEVATION (SECOND-ADDED) FEATURE ACCOUNT COST NO.ITEM ill ,000) 01 LANDS 1,444 03 RESF.RVOIRS 3.456 04 DAMS 219,543 Main Dam 140,971 Spillway 19,792 Power Intakes 42.136 Auxi1 iary Dam 3,897 Construction Facilities 12.747 07 POWERPLANT 147,977 Powerhouse 42,702 Turbines and Generators 57.808 Accessory El ectri ca 1 and Powerplant Equipment 10,475 Ta i1race 13.921 Switchyard 19.518 Construction Facilities 3.553 08 ROADS AND BRIDGES 8.528 14 RECREATIONAL FACILITIES 512 19 .BUILDINGS,GROUNDS.AND UTILITIES 2.519 20 PER~~NENT OPERATING EQUIPMENT 1.800 30 ENGINEERING AND DESIGN 26,962 31 SUPERVISION AND ADMINISTRATION 19.259 .., TOTAL PROJECT COST 432.000 11 Uf,'$ Table B-2 Appendix I B-21 C-2 r""' SUMMARY COST ESTIMATE JANUARY 1975 PRICE LEVEL WATANA CAMANO RESERVOIR r 2200 FEET NORMAL POOL ELEVATION (SECOND-ADDED) I""'"FEATURE ACCOUNT COST NO.1.m1 ($1,000) ,..... 01 LANDS AND DAMAGES 16,392 03 RESERVOIR 9,180 04 DAMS 479,775-.Main Dam 194,172 Spillway 57,665 Out1 et Works 44,544 F-Power Intake 123,298 Construction Facilities 60,096 07 POWERPLANT 232,305 Powerhouse 67,229 Turbines and Generators 50,649 Accessory Electrical and Powerplant Equipment 11 ,121 Ta i 1race 47,287 Switchyard 15,717 Transmission Facilities 12,667 ,-Construction Facilities 27,635 08 ROADS AND BRIDGES 26,137 14 RECREATIONAL FACILITIES 39-19 BUILDINGS,GROUNDS,AND UTILITIES 3,565 20 PERMANENT OPERATING EQUIPMENT 1,800 30 ENGINEERING AND DESIGN 30,142 31 SUPERVISION AND ADMINISTRATION 37,665-TOTAL PROJECT COST 837,000 Table B-3 Appendix I 8-22 ,..... \ i C-3 SUMMARY COST ESTIMATE JANUARY 1975 PRICE LEVEL DEVIL CANYON DAM AND RESERVOIR 1450 FEET NORMAL POOL ELEVATION (FIRST-ADDED) , j ACCQUtn NO. 01 03 04 07 08 14 19 20 30 31 FEATURE COST " ITEM ($1,000)~-'1 LANDS 1.444 '1 RESERVOIRS 3.456 DA~1S 236,728 Main Dam 140,971 Spillway 19,792 Power Intakes 42.136 Auxi 1i ary Dam 3,897 Construction Facilities 29,932 POWERPLANT 359,700 Powerhouse 42,702 Turbines and Generators 57,808 Accessory Electrical and Powerp1ant Equipment 10,475 Ta;l race 13,921 Switchyard 19,518 Transmission Facilities 206,933 Cons tructi on Facil iti es 8,343 ROADS AND BRIDGES 31,266 RECREATIONAL FACILITIES 512 BUILDINGS,GROUNDS,AND UTILITIES 2,519 PERMANENT OPERATING EQUIPMENT 1,800 ENGINEERING AND DESIGN 44,648 SUPERVISION AND ADMINISTRATION 31,927 TOTAL PROJECT COST 714,000 Table 8-4 Appendix I 8-23 . C-4 TABLE &-5 --DETAILED COST ESTIMATE--Continued WATANA DAM AND RESERVOIR Guat Account Number Descrlption or Itern DAMS MAIN DAM (Cant I d) Dri llin~and grouting Drainagc system Right abutment ~cepage control Subtotal Contingencies 20% TOTAL,MAIN DAM Unit LF .LS LS Quant 145,000 Unit Cost ($) 18.75 Total Cost ($1,000)' 2,719 283 2,000 ., ~ ,} 161,810 32,362 194,172 04.1 04.1 SPILLWAY Clearing and stripping Foundation preparation Excavation Concretc Mass Structural Cement Reinforcing steel Anchor bars Dr!lUng and grouting Drainage system Tainter ~ates (3~, cumplC'te Stoplog~(1 set) Electrical and mechanical work Subtotal Contingencies 20% TOTAL,SPILLWAY OUTLET WORKS Intake st ructure Excavation rock Foundation preparation Concrete MnElR Structurlll Cement Reinforcing steel AC 150 CY 8,500 CY 10,530,000 CY 97,000 CY 15,100 Cwt 240,000 Lbs 1 •510 ,000 Lbs 37,000 LF 6,200 L5 LS LS LS CY 41,000 5Y 8,000' CY 20,400 CY 18,500 Cwt 82,000 Lbs 3,055,000 1,500.00 16.00 3.00 50.00 325.00 4.00 .60 1.25 21.50 15.00 10.00 50.00 325.00 4.00 .60 225 136 31,590 1",850 4,908 960 906 46 133 250 3,250 300 500 48,054 9,f>11 57,665 615 80 1,020 6,013 328 1,833 C-'5 Appendix I ~ 8...25 jj r TABLE B-5 -DETAILED COST E5TIMATE--Cont1nued WATANA DAM AND RESERVOIR Cnst Account Unit Total Number Description or Item Unit Quant Cost Cost r-($)($1,000) 04 DAMS /"'".04.3 OUTLET WORKS (Cont'd) Electrical and mechanical work LS 100 Gnte bonnets EA 4 133,000.00 532 f""'1 Gate frames EA 4 130,000.00 520, Gates (slide)EA 4 285,000.00 1,140 Trash racks EA 4 96,000.00 384 Tnintcr gates EA 4 395,000.00 1,580 excavation Tunnels CY 95,300 125.00 11,913 Concrete CY 21,700 300.00 6,510 Cement Cwt 100,000 4.00 400 Reinforcing steel Lhe 4,790,000 .60 2,874 Elevator L5 1 200 Stairs L5 1 100 Steel sets &lagging Lbs 349,000 1.00 349 Rock bolts EA 3,700 170.00 629 Subtotal 37,120 Contingencies 207-7,424 !""";TOTAL,OUTLET WORKS 44,544 U4.4 POWER INTAKE WORKS-Intake structure Excavation CY 222,000 15.00 3,330 Foundation preparation SY 3,700 10.00 37 r-MaRS concrete Cy 39,SOO 50.00 1,975 Structural concrete Cy 69,200 325.00 22,490 Cement Cwt 376,000 4.00 1,504 Rcstecl Lbs 4,839,000 .60 2,904 I"""Emb.metal Lbs 35,000 3.00 105 Trash rack LS 1 2,000 Stairs L5 1 75-Elevator L5 1 200 Bulkhead gates,LS 1 1,500 Stoplogs L5 1 1,500 fI""':Electdcal and mechanical work L5 1 1,600 Truck crane LS 1 225 Bridge L5 1 2,500 r'"'Trash boom L5 1 300 Tunnel excavation CY 79,000 125.00 9,875 r Appendix I I 8-26, C-7 TABLK B-S --DETAILED COST ESTIMATE--Continued lolATANA DAM AND RESERVOIR (;usl A,',:ulln t Unit Total Numht.·r Description or Item Unit Quant Co:::;t Cost ($)($1,000) 04 DMl5 ., , 04.4 POWER INTAKE WORKS (Cent'd)',\1. .]1 Concrete CY 16,650 300.00 4,995 Cement Cwt 84,000 4.00 336 """! Resteel Lbs 3,745,000 .60 2,247 l's Steel liner Lbs 21,000,000 2.00 42,000 ,"d~ Bonnet ted gates LS 900 Electrical and m!.'!chanica1 work L5 150 Subtotal 102,748 ., ContlngE'ncies 20%20,550 l TOTAL POWER INTAKE WORKS 123,298 ~ :t TOTAL DAM~419,679 1 07 Po\olERP LANT 07.1 POWERHOUSE Hob t lizat 1 on and prepnratory work LS 1 3,500 Exc;Ivation,rock Cy '02,000 110.00 22,220 Concr£>tc Cy 57,600 325.00 18,720 Cement Cwt 261,000 4.00 1,044 Reinforcing steel Lbs 5,228,000 .60 3,137 Arch I tl'ctura1 features L5 1,000 Elevator LS 200 Mechanical and elect ri COO'll work LS 3,300 Structural steel Lbs 1,250,000 1.50 1,875 Miscellaneous metalwork Lbs 150,000 3.00 450 Draft tube bulkhead gates L5 380 Rock holts EA 563 170.00 % Stp.el sets Lbs 102,000 1.00 102 Subtotal 56,024 ContinRenclcs 20%11.205 TOTAL,POWERHOUSE 67,229 """Appendix I f! B-27 ;~ C-8 TABLE B-S --DETAILED COST ESTntATE--Continued WATAHA DAM AND RESERVOIR -r:ml t Acrnunt Numbt"'r 07 07.2 Descrlption or Item POWERP1..ANT (Can t f d) TGRBTNF.S A~ID GF.NERATORS Turbines GoVp.rnorR Generators Subtotal r.onttn~encies 20% Unit LS LS LS Quant Unit Cost ($) Total Cost ($1,000 ) 20,608 76'5 20,834 42,207 8,442 ,.... r 07.3 07.4 TOTAL.TIJRBTNES AND GENERATORS ACCESSORY ELECTRICAL EQUIPMENT A~ce~sory Electrical Equipment LS r.ontin~encics 20% TOTAL,ACCESSORY ELECTRICAL EQUIPMENT tHSCF.LLANEOUS Po\-lERPLANT EQUIPMENT ~1i8cellaneous Ptwerplant Equipment LS Contingencies. TOTAL,UISCELLANEOUS POWERPLANT EQUIP~fENT 50,649 4,065 813 4,878 5,202 1,041 6.243 07.5 TAiLRACE Excavation.tailrace tunnel CY Concrete,tailrace tunnel I1ning CY Cement Cwt Rl>infordng steel Lbs Rock bolts EA Steel sets Lbs Subtotal Contingencies 20% TOTAL,TAILRACE 223,000 21,000 104,000 5,202,000 3,400 1,115,000 125.00 300.00 4.00 .60 170.00 1.00 27,875 6,300 416 3,122 578 1,115 39,406 7,181 47,287 07.n SWJTCHYARD Trnnsformer~ Insulated cables LS LS 5,826 1.030 Appendix I 8-28 C-9 TARLE 8-5 --nETAILIID COST ESTI~·fATr;--Continued \olATANA DAM AND RESERVOIR / ~Hsl An°(It ttl t Nltmlw r [}N;cription or Item Unit Quant Unit Cost ($) Toti'l1 Cost ($1,000) 07 0".(, POWF.RPI.Aill' SH I TGllYAIlD (Con t I d) Swi tchynrd LS 6,241 SubLotal. CnntlnRcnc[cs 20% 13,097 2,620 'fOTAl.,S\oJI TC IIY I\R.D 15,717 07.8 TRi\NSrllSSIOl~FACILITIES TrnnsoiHsinn Facilities Contin~wndcs 20% LS I83,noo 36,~oo TOTAL,1'RANSltISS ION FACILITIES 219,600 TOTAL,POWI;:RPLANT 411,603 5,096 1,515 80 293 2,232 2,488 114 3,(,48 3,700 1,585 203 1,302 1,770 81 2,592 10,noD 3,000 1,500.00 6.20 2.00 30.no 12.00 1,500.00 6,20 2.00 30.00 12.00 1 1 1 1 135 210,000 885,000 2,700 216,000 1 1 195 360,000 1,244,000 3,800 304,000 LS LS LS AC CY CY CY CY LS LS 27 miles Canyon) AC C'f Cy CY C'f LS LS miles ROADS ANn BRlDr.ES 1'<.'rm;uwn t hc cess Ra<ld - (llighwny No.3 to Devil C]cari ng r::x(~:lvation Emb:mkrncnt Riprnp Ruad surfacing (crushed) Br il..I~es Culverts nnd guar.drail Perm:1I1cnt Access Road -37 (Upvii Canyon to Watana) C1.(':l r1 ng Exc<lvntinll Emhnnkr.lcnt Riprnp Rand surfrtcing (crushed) Bridges Culv~rts Rnd guardrail Pennnnf'nt on-Bite roads Power pI ant :tccess tunnel Power plnnt access road Dam crest road OR Appendix I 8-29 C-I0 C-11 TABLE B-5 --DETAILED COST ESTIMATE--Continued WAl'ANA D.\ll ANi.)RESERVOIR Cost 1\('I"oun t Unit Total Numh(~r UC'l'lcription or Item Unit Quant Cost Cost ($)($1.000) 20 PERf-tANEl'iT OPERATING EQUIPMENT Operating r:quipment !1nd Facilities LS 1 1,500 Contingencies 20%300 ., ~ ~.~ TOTAL,P ER.!ti\NENT OPERATING EQUIP~1ENT 1.800 ~ 50 CONSTRUCTION FACILITIES Ii lJ i v(!rl'l i on tunnels ,;} Exc\lvation CY 281,000 115.00 32,315 Concrete CY 48,750 275.00 13,407 Cem('nt Cwt 244,000 4.00 976 R(.~stccl "Lbs 11,544,000 .60 6,Q27 Steel sets and lagging Lbs 1,404,000 1.00 1,404 Rock bolts EA 7,800 170.00 1,326 Diversion outl"t works Exc:nvation CY 14,000 15.00 210 ,., Concrete CY 7,500 325.00 2,438 ')Cement Cwt 30,000 4.00 120 Restce 1 Lbs 1,500,000 .60 900 Anchorl'l LS 1 500 Diversion inlet works E:xcavation CY 43,000 15.00 645 Concrete CY 16,500 325.00 5,363 Cem('nt Cwt 58,000 l~.00 232 Rcstcel Lbs 2,475,000 .60 1,485 Gate frames .'\nd gates LS 1 861 ..Uivcrsion tunnel plug LS 1 3,000 i Care of LS I 1,000 ~¥'\Ulter Subtutal 73,109 Contin~encies 20X 14,622 TOTAL,CflNSTRUCTION FACILITIES 87,731 TOTAL CONSTRUCTION COST 998,864 '30 ENG~tJEER lNG AND DESIGN 39,638 31 SUPr.RVISION AND ADMINISTRATION 49,498 TOTAl.PROJECT COST 1,088,000WATANADAMANDRESERVOIR ELEVATION 2200 (First-Added) C-12 DETAILED COST ESTn1ATE I)I~V lL CANYON DAM AND RESERVOIR,ELEVATION 1450 .JANUARY 1975 PRICE LEVEL (SECOND-ADDED) Cllst hl'l'lIlll1l Numher 0] l)NH'r1 p t 1 on 0 r 1 tern I.ANUS AND DM1A<;I£S HI-servo I r l'lIb I k tloma In l'r!v.,rt'Innd S I U:and other 1~C'c ren t ion Unit AC AC AC AC Quant 8,350 850 250 740 Unit Cost ($) 300.00 300.00 600.00 600.00 Total Cost ($1,000) (2,505) 255 150 440 SilO t nt:l I Cnnt 1n~cnc ies 20i? (;(lVI~rnmcnt .1dminl strative cost TOTAl.,LANDS AND DM1AGES Construction cost Fconum1 c co~t 3,350 670 430 (4,450) 1,444 C3 ,006) , \ 01 In:SERVUIH Clc:lrinp, Cont·[n~{'ncics 20% 'rOTAL,RESERVO lR DAHS Mil IN DM! Mohl1.1?atlon nnd preparatory work I'rt·vcmt iun of water pollution S(':l1 j n~of canyon walls Exc.,vnt 10n E:<plor~tnry tunnels ll.,m Foundation treatment Drilling J InC'holes for roek l~X(,i1Vnt ion 11ri 11 ing and grouting Dr.11nage holes Concrete Dam Thrust block FoundatIon treatment AC LS LS CY CY CY CY LF LF LF CY CY CY 1,920 21,000 3,500 327,000 3,000 34,000 64,000 29,570 994,000 25,600 3,000 1,500.00 75.00 190.00 15.00 60.00 4.60 22.00 15.30 50.00 60.00 125.00 2,080 576 3,456 24,100 500 1,575 665 4,905 180 156 1,408 452 49,700 1,536 375 Tabl c B-6 Appendix I B-32 C-13 TABLE B-6 -"'DETAILED COST ESTIMATE--Continued DEVIL CANYON DAM AND RESERVOIR CClAt At'count :~umber 04.2 Description or Item DAMS MAIN OAM (Cont'd) Fouml;lt"ion,mass StructuT.'ll Cool inJ;concrete Contraction juint and cooling system grouting Cement POZ7.0)an R~inrorcing steel Gatt!s Slid!.'gates,frames, guides,and operators Hi SCl~1 J ancous IltJ;h strength steel strnnds 1~1rthquake anchorages G;mtry crane Gnntry crnne rails Elevators Stairways Instrumentation Ruck bolts Chnln"'Jink fence El ectTic;)l nnd mechanIcal work Miscellaneous metalwork Subtotal Contingencies 20% TOTAL,MA 1N DAM SPILLWAY Excavation,aJl classes Foundation preparation Drilling nnd grouting Anchor bnrs Drn in'lge system Concrete Mass Structural C('mcnt Unit CY CY L5 L5 Cwt Cwt Lbs Lhs 15 L5 -Lbs L5 Lbs L5 LF LF L5 L5 CY 5Y LF LF L5 CY CY Cwt Quant 3,779 )000 922,000 1,200,000 4 290,000 39,000 105,500 50,000 1,535 170,000 239,000 7,520 8,000 48,000 1 37,000 12,000 152,000 Unit Cost ($) 50.00 325.00 4.00 3.00 .60 345,000.00 2.00 l.00 5.20 10.70 15.00 3,00 15.00 10.00 25.00 1.25 50.00 325.00 4.00 Total Cost ($1,000) 763 3,328 2,000 1,135 15,116· 2,766 720 1,380 580 ~OO 385 39 280 549 115 535 23 1,000 510 117,476 23,495 140,971 3,585 75 200 60 500 1,850 3,900 608 C-14 Appendix I B-33 C-15 TABLE B-6 --DETAILED COST EST~TE--Continued DEVIL CANYON DAM AND RESERVOIR COHt i\t'counl NllmOl'r [)~scrlfltion or Item Unit Quant Unit Cost ($) Total Cost ($1,000) DAMS AUXll.lARY DAM (EARTH FILL)Cont'a) Cl'mr!1 t ewt 13 ,50 a Suhtot<11 Contingencies 20% TOTAL,AllXTi..IARY DAM TOTAl..DAMS 4.00 54 t 3,247 650 3,897 206,796 07 07 .1 07,2 POWER PLANT POWERIIOUSl:: Mob i r 17011 l ion and prC'parntory work- Exe'!Wltion.rock Concrete Cement RC'infnrc ing steel Architectural features Eh!vatur McC'h:mical and l'll~t:l ri cal work Structural steel Miscrllaneous metalwork Subt 0 t ,11 ContinK~ncjcs 20% TOTAL.POWERHOUSE TURB [NES AND GENERATORS Turbines Gnvcrnur~ (;<.'Tlcrators SlIbtl\t;}1 Cont !ng~ncLcs 20% L5 1 CY 120,000 CY 20,000 Cwt 100,000 Lbs 4,600,000 L5 L5 L8 Lbs 1.200,000 . Lbs 150 t 000 L5 LS L5 110.00 325.00 4.00 ,60 1.50 3.00 5,000 13 ,200 6.500 400 2,760 1,000 75 4,400 1,800 450 35,585 7.117 42,702 22,575 2,546 23,052 48,173 9,635 TOTAL,TURBINES AND GENERATORS C-16 57,808 Appendix I B-35 TABLE B-6 -~DETAILED COST ESTIMATE--Cont1nued Gnst A<"cntlnt Number OR TABLE B-6 --DETAILED COST ESTIMATE--Continued DEVIL CANYON DAM AND RESERVOIR Unit Total I>escription or Item Unit Quant Cost Cost ($)($1,000) ROADS AND BRIDGES (Cont'd) Culverts LF 850 39.00 33 Tunnc I LF 2.100 2,975.00 6,248 Road tn operating fncJ 1 ity Uile 2 100,00q.OO 200 Subtotal 7,107 Cone ingenc1el'::20i.1,421 TOTAL,ROADS AND BRIDGES 8,528 RECREATWN FACILITIES Site A (BOClt :tn"css only) Boat dock FA 1 25,000.00 25 C.1mping units £A 10 1,800.00 18 'I'wo-v:lull toilets EA 2 2,000.00 4 Subtotnl 47 Cont ingcncies 15%7 Total Site A 54 Site B Access road Mile 0.5 100.000.00 ~n Ovcrnight camps EA 50 2,500.00 125 Comfort stations EA 2 35,000 .00 70 Power L5 25,000.00 25 Sewerage L5 50,000.00 50 Suhtot;t 1 320 Contingpnc:ies lSi.48 Toti11 Site R 368 Site C Tr:tilhcncl picnic area lie CI!SR road Pi.cniC'units w/parking Trail system Two-vault toilets Sub~l}t<ll Contjngcm·it.~s lSi.: Total Site C Mile EA Mile EA 0.2 12 30 2 100,000.00 2,000.00 1,000.00 2,000.00 20 24 30 4 78 -12 90 TOTAL,RECRI::ATION FACILITIES C-18 Appendix I B-37 512 Appendix 1 8-38 C-19 TABLE B-6 --DETAILED COST ESTlHATE--Continued DEVIL CANYON DAM AND RESERVOIR Cost AC'c'uunt NUl1lber Ill'~C'r j ption or Item CONSTRUCTION FACILITIES Rt.·'"t t.'"l Andlors Care of W'lter Sub t ot :.11 Gonl in~cncj es 20i. Unit (Cont'd) Lbs LS L5 Quant 750,000 1 1 Unit Cost ($) .60 Total Cost ($1,000) 450 250 1,000 13.583 2,717 '\0 TOTAL,CONSTRUCTION FACILITIES TOTAL,CDNSTRUCTION COST ENC:1NEf.RING AND DESIGN SUPERVISION AND ADMINISTRATION TOTAL [)ROJECT COST OIWIL CANYON DAM AND RESERVOIR ELEVATION 1450 (SECOND-ADDEo) C-20 16.300 385.779 26.962 19.259 432,000 Appendix I 8-39 ---) 1 ,-~-1. .---_, ___ ,_ ) •; '"··· ) _;,_._,._ -l ----l ----1 --1 _} -l ---J ] ---l ) ) 1 ) SUMMARY COST ESTIHATES~-OTHER PROJECTS STUDIED JANUARY 1975 PRICE lEVEl (Costs In S1,000) ~ n VEE I N 2350 f-' • ACCOUNT 'PROJECT NO. FEATURE 01 lANDS AND DAMAGES 7,000 2,550 3,495 8,400 4,381 4,381 12,050 12,050 02 RElOCATIONS 13,000 03 RESERVOIR 4,800 3,165 5,160 7,650 5.100 5,100 7,920 7,920 04 J:lAH 237,017 203,170 225,500 574,900 _165,058 165.058 287-.229 287;229 07 POWERPLAllT 143,788 159,600 450,478 3p,076 106,143 360,721 153,788 08 ROADS AND BRIDGES 1, 500 19,968 20,748 341511 47,587 24,849 48,231 25,493 14 RECREATIONAL FACILITIES~ 39 39 39 512 39 39 39 39 19 ) BUILDINGS 1 GROUNDS 1 ANO UTILITIES 3,565 3,565 3,565 3,565 3,565 3,565 3,565 3,565 20 PERMANENT OPERATING EQUIPHEtH 1,800 1,800 1.aoo 1,800 1,800 1,800 1,800 1,800 JQ-31 ENGINEERING AND DESIGN - SUPERVISIOH AND ADHINISTRAT1Dr4 36,279 48,855 53,093 104,184 62,638 44,309 79,419 60,090 50 CONSTRUCTION fACILITIES 35,000 50,100 54,000 80,000 64,756 64,756 76,026 76,026 TOTAL PROJECT COST 340,000 477 .ooo 527 iOOO 1,266,000 668,000 420,000 877,000 628,000 - - - -"i 1 APPENDIX D CORPS OF ENGINEERS 1979 SUPPLEMENTAR Y FEAS 18 ILITY REPORT (8) COST DATA AND SCHEDULE 0-1 .."TABLE B-l--D£lAlLcD COST ESTIMATE--Continued WATANA DAM Arm RESERVOIR Cos-t Account Unit Total Number Descriptiun or Item Unit Quant"-Cost Cost ($)($1,000) 04 DAMS 04.1 MAIN DAM (Cont'd) Embankment Semi Pervious From stockpile CY 1,335,000 3.50 4,673 From req.excavation CV 4,743,000 1.00-4,743 Impervious . Frc:m req.excavation CY 3,342,000 1.00 3,342 From borrow CY 4,031,000 4.00 16,124 Rock From abutments ~R~q.cexcava ti on CV 1,123,000 -.75 84_2 Stockpile CY 420,000 3.25 .1,365 From Spillway Req.exca.CY 13,693,000 .75 10,270 .From roads'-(stockpile)CV-2,348,000 3.25 7,631 From grout -gall ery-'CV 36,000 .75 27 From stockpile misc.CV 800,000 3.25 2,600 From borrow ..CV 17,876,000 9.00 160,884 Filters from borrow CY 7,822,000 8.00 .65,576 Riprap CV 223,000 22.00 4,~O6 Grout gallery Excavation CV 26,700 -75.00 2,003 Concrete (roof-sides).CY 19 ..000 375.00 7,125 Cement .Cwt 87,000 8.00 696 ~Reinforcement LB 6,793,000 .55 3,736 tJ 1:1 Concrete floor steps," landings,etc CY 2,750 500.00 1,375 -Ventilation .375 Access tunnel from Powerhouse . Excavation rock CY 10,768 190.00 2,046 Concrete CY 6,528 600.00 3,917 _Cement Cwt 26,109 -8.00 209 Rest.eel LB 2,164,000 .55 1,190 Subtotal 387,850 Cont i ngene;es 15%58,178 TOTAL,MAIN DAM .44-6,000 .04.2 SPILLWAY Clearing &stripping AC 158 2.500.00 395 Foundation prep."SY 33~700 50.00 1,685- Excavation Common CY 10,568,000 2.00 21.136 D-2 D-3 WI\1J\NI\ON'!I\HlJ R£SEHVOIR Cost AccolJnt Number Description or Item Unit Quant Unit Cost ($) Total Cost .~ (S 1 .OC~) 04 04.3 DAMS OUTLET \-IORKS 45 0 Slope Horizontal Tainter gates (4) Sl1de gates (4) Trashracks (2) Cement Elevators (50-ton) Mob and Prep work Subtotal Contingencies 20% TorAL,OUTLET WORKS LF 4,800 20.00 LF 4,400 20.00 LB 496,000 ~.OO LB 2,200,000 3.00 LB 64,800 2.00 Cwt 110,700 8.00 LS 2 250,000.00 LS 1 96 88~. 1,488\;~ 6,600": 130 . 886:1\ 500 &\;' 1,700 35,081 .7,016 42,000 2.00 2.00 1 ~ 30.00 50.00 100.00 500.00 8.00 .55 4.50 2.00 . 6.66G-;"J!\i 185 :, 3,9SO'! 51,450 4.445 5,155 158 1,876 100 300 7,720 3,188 2,250 300 3,500 425 16,643 12,320 1,126 266 65,745 5,400 SOD 222,000 3,700. 39,500 102,900 555,600 9,372,000 35,000 938,000 1 1 3,860,000 1,594,000 1 1 1 1 95,100·175.00 35.200 350.00 140,800 8.00 483,000 .55 24.350.000 2.70 3 1,800,000.00 1 D-4 POWER INTAKE WORKS Mob and Prep Work LS Intake structure Excavation {rock}CY Foundation preparation SY Mass concrete CY StrlJctura 1 concrete CY Cement Cwt Resteel LB Emb.metal LB' Trash rack LB. Stairs LS Elevator LS Bulkhead gates LB Stoplogs I LB Electrical and mechanical work LS Truck crane LS Bridge -LS Trash boom LS Tunnel excavation CY Concrete CY Cement.Cwt Resteel LB Steel liner LB Bor.netted gates EA Log Boom LS 04.4 ·..... ,1/\l~LL B-I--·IJLll\lLl.lJ CO:d L~T1f11\IL--CllIILiIlUl:U ~iATANA ON4 AHD RESERVOl R Cost Account Number Description or Item Ur.i t Quant Unit Cost ($) Total Cost ($1,000) LS LS LB LB -LS· LF LB LS LS 15,150 28,800 2,038 3,802 1,500 600 5,000 2,500 675 750 253 204 1,000 '0' 250 900 66,472 13,294 SOD 203,862 40,772 245,000 8~o,U09 2.00 4.50 30.00 2.00 75.00 500.00 8.00 .55 1 1 202,000 57,600 261,000 6,912,000 1 1 1,250,000 150,.000 1 '8,445.- 102,000- 1 1 1 CY CY Cwt LB lS lS POWERHOUSE Mob and prep work lS Rock excavation,tunnels, P.H.chamber,trans- former chamber,etc Concrete Cement Reinforcement Architectural features Elevators Hechancia1 and electrical work Structural steel Misc.~1etalwork Draft tube bulkhead gates -guides Rock bol ts Steel sets 600 ton bridge crane JO ton bridge crane Airshaft (transformer. chamber)3 1 OIA 880 1 OAf~S POWER INTAKE WORKS (Cont1d) Electrical and mechanical \'/Ork LS TOTAL,POWER INTAKE WORKS TOTAL DAt4S POWERPLANT Subtotal Contingencies 20% Subtotal Contingencies 20% 04 04.4 07 .07.1 TOTAL,POWERHOUSE 80.000 0-5 ·lAB!.!:B-I--UETI\fL[[)COSI [STlf.1I\T[--Cull Li Iluctl WATANA DN1 Arm RESERVOIR Cost Account Unit TotJ 1 Number Description or Item Unit Quant Cost Cost ($)($1,000) 07 POWERPlANT (Contld) 07.2 TURBINES AND GENERATORS Turbines LS 1 18,900 Governors LS 1 814 Generators LS 1 21.600 Subtotal 41,314 Contingencies 15%6,197 TOTAL,TURBINES AND GENERATOR:.;48,000 07.3 ACCESSORY ELECTRICAL EQUIPMENT Accessory Electrical Equipment LS 1 3,532 Contingencies 15%530 TOTAL,ACCESSORY ELECTRICAL EQUIPHENT 4,000 07.4 MISCElLANEOUSPOWERPLANT EQUIPMENT Miscellaneous Powerp1ant Equipment LS 1 1,716 Contingencies 15%257 TOTAL,MISCELLANEOUS POWERPLANT EQUIPMENT 2,000 07.5 TAILRACE· Mob and Prep Work lS 1 2,400 Tunnel excavation CY 233,000 85.00 19,805 Concl~ete 1in i n9 CV 28,200 250.00 7,050 Cement Cwt 112,800 8.00 902 Reinforcement LB 5,202,000 .55 2,861 Rock bo1 ts IF 51,000 20.00 1,020 Steel sets lB 1,115,000 1.50 1,673 Outlet Portal Excavation rock CY 2.500 75.00 188 Concrete CV 450 500.00 225 Cement Cwt 1,800 8.00 14 Reinforcement LB 207,000 .55 114 """;'~ Stop1ogs-steel .LB 737,100 1.50 1,106 Jj Tailrace channel Excavation rock CY.176,300 50.00 8,815 Concrete CY 4,425 300.00 1,328 Cement Cwt 17,700 8.00 142 Rei nfo"rcement LB 177 ,000 .55 97 Anchor bars #9 LF 5,700 15.00 86 ~, D-6 "1I\Bl.I.B-I--DE1l\lll.1J CUS I I.S 11 MI\n:--COl\Li rllwd Wl\ll\NA DM1 J\HU f{[SCRVOI It TOTAL,SWITCHYARD TRANSMISSION FACILITIES Transmission facilities LS Contingencies 20% TOTAL,TRANSMISSION FACILITIES TOTAL,POWERPLANT ROADS AND BRIDGES Permanent Access Road -27 miles (Highway No.3 to Devil Canyon) Clearing and grubbing AC Excavation Rock CY ,Common CY Embankment CY Riprap CY Road surfacing (crushed).CY Bridges lS Culverts and guardrail lS Permanent Access Road -37 miles (Devil Canyon to Watana) Clearing AC Excavation Rock CY Common'CY 135 "1,500.00 ,,,,",, Cost Account Number 07 07.5 07.6 07.7 08 Description or Item POWERPLANT (Cont'd) TAILRACE (Contld) Cofferdam Subtotal Contingencies 20% TOTAL,TAl LRACE SWITCHYARD Transformers Insulated cables Earthwork Subtotal Contingencies 20% Unit lS lS lS LS Quant 1 . 1 1 1 1 200,000 60,000 890,000 2,700 216,000 1 1 195 300,000 90,000 Unit Cost ($) 20.00 3.00 3.50 30.00 15.00 1,500.00 20.00 3.00 Total Cost ($1,000) 2,000 49,826 9,9G5 60,000 5,434 2,832 1,300 9,566 1 ;913 11,000 255,000 51,000 306,000 5il,OOO 203 4,000 180 3,115 81 3,240 15,000 1,250 293 q,OOO 270 0-7 "lflBlJ:1~-I--lJnAl LLU CUS:I.STU.,J\TL--CuIIL i lI\Jed WATANA DAM AHO RESERVOIR Cost flccount Number Description or Item Ur.i t Quant Unit Cost ($) Total Cost (Sl,OOO) 10 3,000.00 2 3~OOO.00 08 14 ROADS AND BR IDGES (Co ntId) Embankment CY Riprap CY Road surfaci n9 (crushed)CY Bridges LS Culverts and guardrail LS Permanent on-site roads Power plant access tunnel LS Power plant access road lS Dam crest road LS Mob and prep lS Spillway access road LS Switchyard access road LS Road to operating facility lS Power intake structure access road lS Airstrip access road LS Subtotal Contingencies 20% TOTAL~ROAD AND BRIDGES RECREATION FACILITIES Site 0 Camp units (tent camp)EA Vault toilets EA Subtotal Contingencies 20% ·Tatal Site D 1~244,OOO 3,800 304,000 1 1 1 1 1 1 1 1 1 1 1 3.50 30.00 15.00 4~354 114 4,560 5,000 2,250 15,459 1,971 125 3,500 560 300 300 375 650 73,150 14~630 a8,OOO 30 6 36 7 43 ~I TOTAL~RECREATION FACILITIES BUILDINGS,GROUND~AND UTILIT1ES living quarters and O&M facilities LS 19 Site E Tra i1 .sys tem Contingencies 20% Total Site E MI 12 15,000.00 1 180 36 216 l~OOO '2~500 0-8 -....- ......... "'J\IlLl B-I--lJLTI\JLI.U COSI LSTH'IJ\IE--ConLllluL'd Wf\TI\NI\DMl 1\110 RCSUWOI R Cost Account Number Description or Item Unit Quant Unit Cost ($) Total Cost (Sl,OOO) -i 19 BUILDINGS,GROUNDS,AND UTILITIES (Contld) Visitor facilities Visitor building LS 1 Parking area SF 12,000 3.00 "Boat ramp LS 1 Vaul t toilets EA 2 3,000.00 Runway fad 1i ty LS 1 Subtotal Contingencies 20% 100 36 200 6 250 3,192 638 TOTAL,PERMANENT OPERATING EQUIPMENT CONSTRUCTION FACILITIES TOTAL~BUILOINGS~GROUNOS~AND UTILITIES PERMANENT OPERATING EQUIPMENT Operating Equipment and Facilities LS Contingencies 20% TOTAL,CONSTRUCTION FACILITIES 20 50 Diversion tunnels 0.5.Bulkhead Excavation Common Rock Tunnel 33 H..S: Concrete Lining Reinforcement Structural Reinforcement Rock bolts Vertical face Tunnel roof Bulkheads Cement Plug tunnels 'Care of \.,rater Mob and prep work Sub.tota1 Contingencies 20X LS CY. CY CY CY LB CY LB LF LF LS C\"t LS LS LS 1 1 37,700 173,600 336,200 58,350 3,155,000 9,150 1~045,000 24,900 40,000 1 386,700 1 1 1 15.00 50.00 90.00 275.00 .55 500.00 .55 20.00 20.00 8.00 ~,obo 2,500 500 3,000 75 566 8,680 30,258 16,046 1,735 4,575 575 498 800 900 3,094 1,352 1,250 3,500 73,924 14,785 09,000 0-9 lAllLL U-l--UETAILEU CUSI lS"llMATE--Cuntiflucd WATANA DM1 Arm R[SERVOr R Cost Account Number Description or Item Unit Quant Unit Cost ($) Total Cost ($l s 000) TOTAL CONSTRUCTION COST ENGINEERING AND DESIGN 4% SUPERVISION Arm .ADMINISTRATION 5% TOTAL PROJECT COST WATANA DAM AND RESERVOIR ElEVATION21.:i5 (Fir.st-Added) 0-10 1 s619,000 65 s 000 BLOOD. ls765 s000 '..'!" (~;; 0-11 TAGLE B-2--DETAILED COST ESTIHJ\TE--Continucd DEVJL CArlYOH UAM IiNU RESERVOIR.ELEVATION 1450.GRAVITY OAH 4 1 t350~OOO.OO ·5,400 1,845 20.00 37 891,560 .55 490 500.00 1,676 .55 2,363 2,750 8.00 59,520 15,400 323,445 64,689 388,000 Cost Account Number .04 04.1 04.4 Description or Item DAMS MAIN DAM (Cont'd) Scaling canyon walls Stoplog,co~plete Gantry crane Elevator Stairways r:ock bolts Electrical and .mechanci a 1 work Miscellaneous metalwork Foundation treatment Drilling and grouting Drilling-drainage holes Concrete for parapet and overhang Resteel Slide gates,frames, guides and operators Chain'link fence Resteel for sluce conduits Exploratory tunnels (excavation) Rock bolts Contraction joint &cooling system grouting Cement Mob and Prep Subtotal Contingencies 20% TOTAL,MAIN DAM POWER INTAKE WORKS Mob and PrJ~P Excavation Open cut Tunnels· Concrete Mass Structura1 and backfi 11 Cement Reinforcing steel Penstocks Unit LS LS lS' lS lS , lS LS lb. IF LF LF CY Lb Sets LF Lb CY LF LS Cwt lS lS CY CY Cy CY Cwt Lb lb D-12 Quanti ty 1 1 1 1 1 1 1 2,500 400,000 70,000· 52,500 3,352 4,296,115·' 3.500 50,000 1 7,44l~OOO 1 1 7,200 34,400 7,300 10,430 74,000 2,478,000 9,582,270 Unit Cost ($) 4.50 5.56 50.00 35.00 400.00 20.00 75.00 175.00 100.00 500.00 8.00 .55 2.25 """"Tot?l Cos ...;' ($1,000; :"""\'b 1 ,OOO~ 1,000i. 750 600 "",!, 686 1 ,500 1,500 11 2,224 3,500 1 ,838 1,400 1,000 4,496 .540 6,020 730 5,215 592 1',363 21,560 TABLE B-2:--UETAIL[D COST L~TH1ATE--Col1til1lJcd U[VIL CANYOH UI\M AND I{[SERVOIR,[LEVATlON 1450,GHI\VIH DAr·1 Cost Account Number Ucscriptiol\or Item Unit Quantity Unit Cost ($). Total Cos t ($1 ,000) 04, 04.4 : DAHS POWER INTA!~E WORKS (Cont1d) Bonnetted gates and controls EA .Stop logs,(936000#)lS Trashracks (421,000#each)EA- Intake selector gate tower Excavation rock CY Concrete structural CY Cement Cwt Reinforcement lb Selector gates(l,500,OOO#)EA.. 41,80C,OOO.00 1 ·,2 L50 7,400 50.00 47,100 500.00 188,400 8.00 7,065,000 .55 4 3,375,000.00 7,200 1-,875 1,263 370 23,550 ',507 3,886 T3,500 - 04.5 Subtotal .Contingencies 201 TOTAL,POWER INTAKE WORKS AUXILIARY DAM (EARTH FILL AND CONCRETE) Mob and Prep LS Excavation Dam foundation CY Foundation prepareation SY Dam embankment CY Drilling and grouting IF 1 100,000 2,100 835,000 8,800. ·6.00 50.00 6.00 60.00 94,417 18,883 113,000 312 600 105 5,010 528 - - 07 07.1 Subtotal Contingencies 20% TOTAL,AUXILIARY DAM TOTAL,DAMS POWERFLANT POWERHOUSE' Mob and Prep work Excavation,rock Concrete Cement Reinforcing steel Architectural features •LS CY CY Cwt Lbs LS' 0-13 1 208,400 22,000 88,000 5,400,000 1 75.00 500.00 8.00 .55 6,555 1,311 8,000 509,000 2,000 15,630 '1,000 704 2,970 1,500 TAGLE 0-2--DETAILED COST ESTIMATE--Continued DEVIL CANYOH 0/\11 AND RESERVOiR,ELEVATIOr~1450,GRAVITY Ul\t1 Subtotal Contingencies 20% .TOTAL,TAILRACE 1', dj - Tota 1 Cost~, ($1.000) 4,812 2,512 377 3,000 1,798 270 2,000 200 20,250 1,053 22,950 44,253 6,638 51,000 766 6,333 5,250 562 1,666 700 800 16,077 3,215 19,000 2.25 4.50 675 42,191 8,438 51 ..000 85.00 300.00 8.00 .55 . Unit Cost ($) 1 1 1 1 1 -1 J Quantity 1 1 1,200,000 150,000 1 74,500 17 ,500 70,200 3,029,000 Unit LS LS LS LS Lb Lb LS CV CV Cwt Lb. LS LS LS Description or Item Po\</ERPLANT POWERHOUSE (Contld) Elevtltor Mechanci a1 and electrical work Structural steel Miscellaneous metalwork Subtotal Contingencies 20% TOTAL,POWERHOUSE TURBINES AND GENERATORS Turbines Governors Generators Subtotal Contingencies 15% TOTAL,TURBINES AND GENERATORS ACCESSORY ELECTRICAL EQUIPMENT Accessory Electrical Equipment LS Contingencies 15% TOTAL,ACCESSORY E~ECTRICAL EQUIPMENT MISCELLANEOUS POWERPLANT EQUIPMENT ..Misce11aneousPowerp1ant Equipment LS Contingencies 15% TOTiL,MISCELLANEOUS POWERPLANT EQUIPMENT TAILRACE _Mob a nd Prep Excavation tunnel Concrete Cement Restee1 Draft tube bulkhead qate and guides Tailrace tunnel stop1ogs (370,000#) Cost Account Number 07.5 07 07.1 07.3 07.2 07.4 0-14 ... TAUlE n-Z--DETAILED COST ESTIMATE--Continued UEVIL Cl\NYON DAN J\ND RESERVOIR,ELEVI\TION 1450.GRAVITY DJ\M Cost Account Number Description or Item Unit Quantity Unit Cost ($) .Tota 1 Cost ($1,000: 1""'. f r 07 07.6 POWERPLANT SWITCHYARD Transformers Insulated cables Excavation Rock Common Embankment Subtotal Contingencies 20% .TOTAL,SWITCHYARD TOTAL,POWERPLANT LS LS CY CY CY 1 1 36,000 75 7 000 470 7 000 20.00 5.00 4.00 6,545 3,312 720 375 1,880 12,832 2,566 15,000 141,000 LS facility Mile EA 6,000 2 125,000.00 250 2 500,000.00 1,000 -1 400 2.3 300,000.00 690 2.3 110,nOO.00 253 850 100.00 85 40 30 6 76 15 91 8,678 1,736 '10,'000 40,000.00 3,000.00 3,000.00 1 10 2 EA EAEA . lS Mile Mile IF ,-, ROADS AND BRIDGES Mob and Prep On-site road C1 earing and earthwork Paving Culverts Powerhouse and tailrace access Road to operating Portals Subtota 1. Contingencies 20% TOTAL,ROADS AND BRIDGES RECREATION fACILITIES Site A (Boat access only) Boat dock Camping units Two-vault toilets Subtotal Contingencies 20% Total Site.A 14 08 ,..... - Site B Access road Overnight camps Mile EA' 0.5 150,000.00 50 4,000.00 75 200 i"'. 0-15 TABLE U-2--DETAILElJ COST ESTIi-1I\TE--Continued UEV lL CAiHON D1\M I\NO RCSERVOW,ELEVATION 1450,Gn1\VITY Ol\l~ Cost Account Number 14 Description or Item RECREATION FACILITIES Site B (Cont'd) Comfort stations Power Sewage Su~total Contingencies 20% Total Site B Unit EA LS LS Quantity 2 1 1 Unit Cost ($) 60,000.00 Tota 1 .I!!l!\l ';1' Cost ($1,000) 120 40 75 510 102 612 Site C . .Trailhead picnic -area access road Picnic units w/parking Tra i 1 sys tem Two-vault toilets Subtotal Contingencies 20% Tota 1 Site C Mile EA- Mile EA .2 -150,000.00 12 3,000.00 30 15,000.00 2 .3,000.00 30 36 450 6 522 104 626 "1. 19 20 TOTAL,RECREATION FACILITIES BUILDINGS,GROUND,AND UTILITIES Living .quarters and O&M facilities ..LS' Visitor fad 1 ities Visitor buildings LS Parking Area LS Boat ramp LS Vault to;lets ·EA Subtotal Contingencies-ZO% TOTAL,UUILOINGS,GROUNDS,AND UTILITIES .PERMANENT OPERATING EQUIPMENT Operating Equipment and fae i 1i ties LS Contingencies 20% TOTAL,PERMANENT OPERATING EQUIPMENT D-16 1 1,000 2,500 300 70 220 3,000.00 6 3,496 699 4,000· 2,.200 440 3,000 !.. IAUlE n-2--UETAJLED COST lSTIMl\TE--Continued UEVIl CI\NYOH UI\M I\NlJ RESERVOIR~ELEVATION 1450,GRJ\V ITY lJJ\M Cost Account Unit Total Number Oescri ption or Item Unit Quant.i ty Cost Cost ($)($1,000 50 CONSTRUCTION FACILITIES Mob and Prep work lS 1 1,885 .....Coffer dams Sheet pile .Ton 1,024 1;500.00 1,536. Earthfi 11 .CY 38,000 15.00 570 Pumping LS'. 1 3,500 r-Remove Coffer dams lS i 600, Diversion workds Tunnel excavation CV 35,700 100.00 3,570 .....Concrete CV 9,200 300.00 2,760,Cement Cwt 36,800 8.00 294l' !Reinforcement Lb 1,564,000 .55 860 ,-Steel sets Lb 157,000 3.00 .471 Rock.bolts EA 1,150 300.00 345 Tunnel Plug Concrete Cy·l,ioo 600.00 660 Cement Cwt .4,400 8.00 35 Reinforcement Lb 187,000 .55 103 Diversion Intake Structure r-"Excavation rock Cy 104,000 30.00 3,120 Concrete structural CY 3,800 500.00 1,900 Cement Cwt 15,200 8.00 122 ~Reinforcement Lb 380,000 .55 209 Bulkhead lb 960,000 1.50 1,440 Approach Channel Lining Concrete CY 1,600 300.00 480 Cement Cwt 6,400 8.00 51 Reinforcement Lb 80,000 .55 44 .Diversion Outlet Structure ""'"·Excavation Rock CY 274,000 50.00 13,700 Concrete Cy 1,100 500.00 550 Cement Cwt 4,400 8.00 .35 Reinforcement lb 110,000 .55 61 Stop-logs Lb 100,000 1.50 150 Outlet Channel Lining Concrete CV 900 500.00 450 Cement Cwt 3,600 8.00 29 Reinforcement Lb ..45,000 .55 25 1""'1 Subtotal 39,555 Contingencies 20%7,911 TOTAL,CONSTRUCTION FACILITIES 47,000-.. ,.... ,....0-17 /. i TI\BLE 11-2--0ETAILEO COST f:.STIMI\TE--Continucd OEV 1L CI\NYUfi DJ\11 ANO RESERVOIR,ELEVATION 1450,GRAV lTY OMl ,.,- TOTAL,CONSTRUCTION"COST ENGINEERING AND DESIGN 7% SUPERVISION ANO ADMINISTRATION 5% TOT~L PROJECT COST DEViL CANYON DAM AND RESERVOIR ELEVATION 1450,GRAVITY DAM (SECOND-ADDED) Total Cost ($1 1000)~~, Cost Account Number 30 31 . 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It ~~I • ~ ,, "'.....,,;n.~ I. r I~ ~ 50 :\';0(:.-.1 C"~...(t'J <tYt~E5 \1 ~_f"rf'i' lV ....=-L C'F=P')';-"S r~~t·~_·!'!t:1'-*:%;l~."14", 1.:1(.,'.,_~~'f~,"',"';'_/'.-!-a:!f • , ,~~ n"''''n~M 104 -II .....11.WAY"""!WI I'llOJECY llfYlL CNlY~!WI PROJECT .. '1~.1'.;''-I C~TRUC;YION SCHfDUl.£ 5f£el I OF 3 4 -:l ., +,:r .,. , - J , -+ !<Ii-- 1.-• ...".~_;-w. ~; .~;til, =-:; , j ", +- •.1.' . j:'i-:;1.' .~:-', .~,'\Io 4 t " ;~I .,... .,ott ,..v,·II .'. <> c .. "I: ~:-"" =~ii: ~C C;I ::~ itO ""&"..',... c ~ ~ z we ....:...~~~ ~;:: ~a::..~ C ~:i:Q ~-".I~ "c,.C ~~ <1(.... ~.'"'t.... " ,i+-H ~,:it1I-n .. h -I-( I:t '+t=..,j...+-' :t"~+-+-.1 0-20 .. :..1.J. ~- 1 t-f--:f+:ttl ~i :rli S --,-,-,-,.J..!.J,.l.U.ill.LnlJ:illiUiULlM!lMIHl,:iJEll:lli·Iill~~C~IJ_J;