chester lake project feasibility report - Alaska Energy Data Inventory

Woodwaste Generation Alternative. Louisiana Pacific Corporationoperates the existing sawmlll on Annette Island. The woodwastegeneration alternative could generate electric power byusing the woodwaste produced by the mill to fuel a steam-electricplant located nearby. Discussions with Louisana Pacific, however,indicate that the waste material from the Annette Island sawmillis already being used for fuel in their Ketchikan facility. Inaddition, sawmill operations are intermittant and may not providea reliable source of fuel for power generation. Based on thesefactors and the high cost of energy produced by a wood firedgenerating plant this is a less favorable alternative than eitherdiesel or hydro generation.Electric Load ForecastA description of Metlakatla's population, economy, historicalenergy demand and electrical load forecast is in Chapter II ofthis report. Three scenarios are used in the forecast: low, mostlikely and high. These scenarios project population, commericaland industrial growth at different rates and estimate correspondingelectrical peak power and energy demand. In 1980 the peakdemand was 4,770 kW and the total energy generated was 17,688 MWh.The existing Purple Lake Hydro Plant, with an installed capacityof 3,000 kW, generated 14,994 MWh and the Quarry Diesel Plant of3,000 kW capacity generated 2,694 KWh. The three Purple Lakeunits have a nameplate rating of 1,000 kW each. Forecasts underthe three scenarios show that in 1985 the peak generation will be5,040 kW for low growth, 5,580 kW for most likely growth, and6,100 kW for high growth. The corresponding annual energy generationwould be 19,850 MWh, 22,010 KWh and 24,060 MWh at thegenerating plants, respectively.Economic AnalysesThe economic analysis, for the project is based on criteriaestablished by the Alaska Power Authority in accordance with Statefeasibility study regulations. In accordance with those regulations,a "base case" plan, a "preferred" plan and a "second mostpreferred" plan were developed.The power market would continue to be served by the existingPurple Lake Hydroelectric Project supplemented by diesel unitsunder the Base Case Plan. The Preferred Plan would be the PurpleLake Project supplemented by the Chester Lake Project. The SecondMost Preferred Plan would be the Purple Lake Project supplementedby the Triangle Lake Project.As previously noted, three alternative development plans forthe Chester Lake Project were investigated. An economic compari--4-

son of the three alternative indicates that the 2.5 MW projectwith reservoir El 885 is the most favorable development for themost likely and high scenarios of load growth. This developmentof Chester Lake was therefore selected as part of the PreferredPlan for comparison with the other plans of system expansion.An economic analysis of the alternative system expansionplans, using present worth method, indicates that the PreferredPlan is the most favorable one. The values given below are basedon most likely load growth using 50 year project life for comparison.In the analysis the future annual costs of amortization,operation and maintenance, and diesel fuel are discounted to year1982 at 3 percent rate of interest. All alternative plans willserve full capacity and energy demand throughout the SO year projectlife.PlanBase CasePreferred (Chester Lake)Second Most Preferred(Triangle Lake)Present Worth(-cost)S Million54.3430.9537.18Alternative residential heating technologies have been investigatedand an economic analysis of the alternatives was performed.The economic analysis shows that, the cost of energy from theChester Lake Project, heating by electrical resistance is lessexpensive than fuel oil heating after 1989. The least cost alternativefor all years studied is wood heating but this alternativeis expected to continue as a supplemental energy source because ofits inconvenience and time-consuming operation.Financial AnalysesThe cost of energy from the entire generation system and fromthe Chester Lake Project alone were estimated under four alternativefinancing plans. The cost of energy was computed for each ofthe three alternative developments of Chester Lake and for themost likely and low load growth scenarios. For comparison, thecost of energy for the Base Case is also presented. The fourfinancing plans selected for study are the following: funding by35-year 12% revenue bonds, by a 35-year 5% loan, funding to yielda 5% rate of return (covering capital and O&M costs) or by a combinationof 5% and 13% loans. The results of these studies areshown on Exhibits 19 and 22 of the report.-5-

Analyses were also performed to determine the sensitivity ofthe cost of residential electric heating that results from ChesterLake financing alternatives. The analyses were performed for boththe most likely and low load growth scenarios.For the most likely scenario the analyses show that the costof electric resistance heating becomes less than that of oil heatingin 1992 with 12% financing, in 1988 with a 5% loan, in 1986with a 5% rate of return, and in 1990 with 5%/13% combined financing.When compared to $120/cord wood heating, electric heatingbecomes more economical in 1990 for 5% rate of return financingand in 1993 for 5% loan financing. For the other financing alternativeswood heating is the least cost option during the entirestudy period.For the low scenario the cost of electric heat is less thanthat of oil heat starting in 1993 for 12% financing, in 1988 for a5% loan, in 1987 for a 5% rate of return, and in 1991 for 5%/13%combined financing. Electric heating becomes more attractive than$120 per cord wood heating in 1994 for 5% loan financing of ChesterLake and in 1991 for 5% rate of return financing. As in thehigh scenario, wood heating is the least cost option when comparedto the other two financing alternatives considered.The Recommended ProjectThe recommended project is the Chester Lake Project locatedone mile east of Metlakatla, on Annette Island in Southeast Alaska.The recommended alternative of the Chester Project is thestorage project with reservoir elevation 885. The project willregulate and di~ert the outflow of Chester Lake, and will have arated net head of 800 feet and an installed capacity of 2,500 kW.With an average flow of 22 cfs, the project will generate an averageof 10,300 MWh per year. Firm energy generation will be 7,900MWh per year.The recommendation of the El. 885 storage project is based onthe results of the economic analysis, which shows this configurationof the Chester Lake Project to have the least present worthcost under the most likely scenario of load growth. The systemenergy costs will vary widely depending on the terms of the financingsecured for implementation of the Chester Lake Project.Electric energy costs on Annette Island are now on the order of4.5 cents per kilowatt hour. With favorable financing of theChester Lake Project, system energy costs will be maintained inthe range of 5.0 to 7.5 cents per kilowatt hour through 1990. Ifsystem energy costs rise above about 8 cents per kilowatt residentialenergy consumers could be driven to other energy sources forspace heating, subsequently diminishing the load growth.-6-

Given such circums~~nces, the determination of whether tobuild the 2.5 MW storage project or the 2.5 MW run of river proJectat Chester Lake should be delayed until the terms of financingfor project implementation are known.project Description. The Table of Significant Data for theproject 1S shown in Exhlbit A. The project will consist of a darnwith spillway and intake, water conductor, powerhouse, substation,access road and transmission line.An 80-foot high concrete arch-gravity darn will be builtacross Waterfall Creek at the outlet of Chester Lake downstream ofthe existing water supply dam. The dam will raise the existinglake level 40 feet, to El. 885, creating a reservoir with 4180acre-feet of live storage. An uncontrolled spillway will belocated in the center portion of the dam and will have a dischargecapacity of 1000 cfs.A single-port intake and penstock 28 inches in diameter whichwill pass through the darn will conduct water from the dam to thepowerhouse. The 2,800 feet long penstock will be supported onsaddles with concrete anchor blocks provided at major bends.The powerhouse will be a reinforced concrete building containingone Francis type turbine-generator unit with a rating of2500 kW. A substation containing a step-up transformer will bebuilt adjacent to the powerstation. Power from the project willbe transmitted to the Metlakatla Power and Light transmissionsystem over a 12.5 kV wood pole transmission line having a totallength of 2800 feet.Access to the powerstation will be by barge or boat, and byfoot via a wooden walkway from the end of Walden Point Road.Access to the dam will be by helicopter or via the existing footpath south of Waterfall Creek.Geotechnical Aspects. The proposed Chester Lake dam willbe founded on the sound igneous bedrock, probably foliated granodioritewith near vertical foliation planes dipping upstream. Theproposed site will provide an adequate foundation and the locationis technically feasible. The bedrock is of sufficient quality anduniformity to support a concrete arch-gravity dam. Weathering ofthe rock mass is very shallow. Jointing is well developed in theform of near horizontal stress-relief joints and near verticaljoint sets, both of which influenced the selection of the damtype.Foundation treatment is proposed beneath the entire dam andwill include a 40 feet deep grout curtain, drainage holes, minor-7-

ock trimming and minor rock bolting, following foundation excavation.The proposed penstock will be founded on bedrock. Rock anchoragewill be provided at thrust block foundations to preventsliding.The powerhouse will be located on bedrock immediately northof Waterfall Creek. The powerhouse structure will be notched intothe 45 degree rock slope which will undercut foliation planes.Anchorage will be designed above the proposed excavation to maintainrock slope stability.Environmental ASp!ctS. The Rural Electrification Administration,in ltS Final EnVlronmental Statement of September 1980,reached a Finding of No Significant Impact for the Chester LakeHydroelectric Project after consultation with State of Alaska andfederal resource agencies. Consequently, no additional investigationof the environmental aspects of the project are deemed necessaryand none were performed in the course of this study.Project Costs. The construction cost of the project includesthe direct cost of civil works, contractor's overhead and profit,purchase and installation of equipment, contingencies, engineeringand owner's administration, but excludes interest during constructionand price escalation beyond the date of the estimate. Theestimated construction cost of the project, at January 1982 pricelevel is $13,140,000. A summary of the cost estimate is given asExhibit B.Operation and maintenance costs at the January 1982 pricelevel for the Chester Lake Project including transmission areestimated to be $65,000 per year.Project Implementation. The implementation of the ChesterLake ProJect is estlmated to require 34 months from authorizationto proceed with engineering to project completion. The design andcontract document phase of the project would take an estimated 10months. One contract will be prepared for supply of the majorgenerating equipment items and one for project construction andequipment installation.Assuming that authorization to commence with engineering isgranted by March 1, 1982, the contracts for equipment supply andgeneral construction could be awarded in September 1982 and December1982 respectively. Project construction would take an estimated24 months. Commercial operation of the project could beginin January 1985.-8-

ConclusionsWe find that the Chester Lake Project is technically, economicallyand environmentally feasible. As demonstrated by theelectric load forecast and economic and financial analyses summarizedherein, the project, if placed in operation in 1985, willmeet the growing energy requirements of the Metlaktla Power andLight system. We therefore recommend that the design phase of theproject be authorized subsequent to determination of the terms offinancing for project implementation.The Triangle Lake Project appears to be the next most attractivehydro development on Annette Island after Chester Lake. Werecommend that a gaging station be established in the near futureto record stream flow from Triangle Lake and that environmentaldata collection begin now to provide a reliable basis for feasibilitystudies.We will be pleased to assist the Power Authority and MetlakatlaPower & Light in implementing the Chester Lake Project.Very truly yours,K. R. LeonardsonProject Manager-9-

Exhibit APage 1 of 2TABLE OF SIGNIFICANT DATACHESTER LAKE HYDROELECTRIC PROJECTRESERVOIRHYDROLOGYDAMSPILLWAYWater Surface Elevation, ft above mean lowerlow water (mllw)Normal MaximumMinimumTailwater Elevation, ft mllwSurface Area at Normal Max. El., acresEstimated Useable Storage, acre-feetType of RegulationDrainage Area, sq miAverage Annual Runoff, cfs/mi 2Streamflow, Average Annual, cfsTypeMaximum Height, ft aboveCrest Elevation, ft mllwCrest Length, ftDam Vol wne, cyTypeCrest Elevation, ft mllwWidth, ftDesign Discharge, cfsWATER CONDUCTORConcretedeepest excavation885.0845.022.01394180Seasonal1. 621322Arch-Gravity808902205,000Uncontrolled overflow885.025.01,000TypeDiameter, in.Length, ftShell Thickness, in. (maximum)Steel Penstock282,8000.313

Exhibit APage 2 of 2TABLE OF SIGNIFICANT DATA (Cont'd)POWERSTATIONNumber of UnitsTurbine TypeRated Net Head, ftGenerator Unit Rating, kW1Standard Francis8002,500POWER AND ENERGYInstalled Capacity, kWFirm Annual Energy Generation, MWhAverage Plant Factor %2,5007,90047

Exhibit BCONSTRUCTION COSTItem1. Mobilization2. Cableway Access to Dam Site3. Dam, Spillway & Intake4. Penstock5. Powerhouse6. Access Road to Powerhouse7. Mechanical & Electrical Equipment8. Transmission LineSubtotal+ 15% Contingency Allowance On All ItemsExcept No.7.+ 10% Contingency Allowance on Item No. 7_EngineeringOwner's Overhead & AdministrationTotal Construction Cost atJanuary, 1982 Price LevelCosts$ 485,0001,624,0002,869,020897,300800,5501,055,0001,972,00070,000$ 9,772,8501,170,150197,0001,300,000700,000$13,140,000

Chapter IINTRODUCTIONAuthorizationThis study was performed under a contract between the AlaskaPower Authority and Harza Engineering Company, effective October21, 1981 and subsequent amendments. Funds for the study wereprovided by the State of Alaska. Parts of work were performedunder subcontracts with Charles Pool and Associates, Inc., fortopographic surveys and mapping: and Salisbury and Dietz, Inc.,for drilling for subsurface geotechnical investigations.Purpose and Scope of ReportThis report documents the results of feasibility studies ofthe Chester Lake Project located near Metlakatla on Annette Islandin Southeast Alaska. The objectives of the study are to reviewupdate and expand the detail of previous studies which indicatedthat the project was sufficiently attractive to warrant construction.The scope of the study includes the following work tasks:1. Review and update the 1977 Definite Project Report onthe Chester Lake Project.2. Prepare an electrical load forecast for a 20 yearperiod.3. Survey and map the project area.4. Geotechnical investigation of the project site includingsubsurface exploration.5. Evaluate various means of access for construction andoperation of the project.6. Prepare cost estimates, operation analyses and economicevaluations of three alternative plans of development ofChester Lake.7. Prepare a design and construction schedule for theselected Chester Lake development.8. Evaluate the economic feasibility of the selecteddevelopment project.1-1

9. Investigate four specific power generation alternativesto the Chester Lake Project.10. Prepare an economic evaluation of alternative heatingtechnologies.11. Estimate the busbar cost of energy from the Chester LakeProject alone and from the entire MP&L system as a functionof four specific alternatives of project financing.12. Prepare the final report documenting the studies.Background and Previous StudiesThe existing electrical generation and distribution systemserving the Metlakatla Indian Community was first established in1927 when the one unit, 150 kW, Chester Lake Hydroelectric Projectcommenced operation. In 1937 a second hydropower unit, of 250 kWcapacity, was added to the Chester Lake Project. Further additionsto the system generating capacity were made in 1956 when two1000 kw units were installed at the Purple Lake HydroelectricProject. In 1962 a third 1000 kW unit was installed at PurpleLake. The latest additions to the system were two 1500 kW dieselpowered generators at the Quarry Diesel Plant, the first installedin 1967 and the second in 1970.Operation of the Chester Lake plant ceased in 1956 when thefirst ?~rple Lake units came on-line. The Chester Lake ~nstocksand powerhouse have since been abandoned. The old concrete darncontinues to maintain Chester Lake at its present elevation formunicipal water supply for Metlakatla. The darn was inspected in1976 and found to be in disrepair with substaintial leakage notedthrough cracks in the structure and along its foundation. Replacementof the structure was recommended.The Metlakatla Indian Community has been operating its ownpower system since 1927. Recent increases in fuel cost have had adetrimental effect on the community as indicated by a 13% declinein annual energy utilization by the commerical sector in 1979following a major increase in the electricity tariff. Studies toreplace diesel generation with hydropower were begun in the mid1970's. Redevelopment of Chester Lake for hydropower generationwas investigated in a feasibility studyllprepared for the IndianCommunity in 1977. That study found that the project wasII Robert W. Retherford Associates, Definite Project Report,Chester Lake Hydroelectric Project, July 1977.1-2

sufficiently attractive to warrant construction, but delaysrelating to the licensing and funding of the project haveprevented its implementation. The delays have also resulted in asubstantial increase in t~e project cost. The presentinvestigations have been undertaken to update the previousstudies.The 1977 report was reviewed and the following points will becovered in the applicable section of this report:1. Additional consideration should be given to the type ofdam and spillway selected.2. The penstock should be studied to determine the mosteconomical diameter.3. The powerhouse location and structural arrangementappeared to be risky as it involved excavation into alarge talus slope.4. The hydrology studies appeared to be reasonably accuratefor spillway capacity and power and energy determinationfor the proposed project. The studi~s should be updatedto include the most recent data available.5. Additional surveying and mapping would be needed fordesign and also needed to determine reservoir area andvolume and to estimate project costs more accurately.6. A drilling program for geotechnical investigation offoundations for structures, especially the dam andpowerhouse are needed.7. The estimates of project costs need to be updated forescalation that occurred since 1977 and all projectquantities and unit prices should be re-estimated basedon this independent study and investigation.8. The load forecast was not reviewed because a separateforecast was required for this study.9. An independent economic and financial analyses inaccordance with APA guidelines will be made; therefore,these subjects were not reviewed.AcknowledgementsWe acknowledge and appreciate the valuable assistance andadvice offered by staffs of the following agenices:I-3

Alaska Power AuthorityMetlakatla Power & LightMetlakatla Indian CommunityLouisiana Pacific Corporation1-4

Chapter IIELECTRIC LOAD FORECASTIntroductionAnnette Island is located near the southern end of theAlexander Archipelago in Southeast Alaska. Although the islandcovers 136 square miles, the mountainous terrain of the islandlimits settlements to the Metlakatla Peninsula, about 24 squaremiles in size. The town of Metlakatla is located at the north endof the Peninsula. Farther south on the peninsula is theresidential area of Annette, and the facilities formerly used bythe U.S. Coast Guard. The closest residential and commercialcenter is Ketchikan, located about 20 miles north of Metlakatla,on Revillagigedo Island.The studies and projections, presented in this chapter, arebased on a review of previous reports and discussions withrepresentatives of Federal, State, and local agencies. Valuableinformation was obtained from the Metlakatla Indian Community,Metlakatla" Power and Light, major electricity consumers, fuelsuppliers, and other people involved in the economic developmentof the island. In this chapter, a general description of thehistorical background of the community and the population ispresented. The major economic activities and their potentialdevelopments are discussed. Total energy consumption is analyzedas a basis for determining the demand for electricity.Three scenarios of future electric energy demand aredeveloped, based on differing socioeconomic assumptions. The mostlikely scenario assumes a continuation of present activities andincludes the realization of projects under design and beingplanned by the Community. The low scenario reflects a more conservativegrowth, with some planned development delayed. The highscenario assumes full operation and expansion of the existingindustries, installation of new business ventures, and a commercialdevelopment use of the building facilities at Annette airport,with an associated increase in the population.PopulationThe town of Metlakatla was founded by the Tsimpshean Indianson March 25, 1887, being led from British Columbia by Father WilliamDuncan. Since then, they have been joined by other AlaskanNatives including Tlingits, Haidas, Aleuts and also by Caucasians.In 1891, the U.S. Congress created the Annette Islands Reserve,which set aside for the exclusive use and occupancy of "MetlakatlaIndians and other Natives of Alaska" the entire Annette Island.11-1

Today, the population is about 1,100 and is still predominantlyAlaskan Natives with an overall percentage of about 80 percent.Until 1942, when the u.s. Army established an Air Force baseon the southern end of the Metlakatla Peninsula, there was littlepopulation outside Metlakatla. During the tenure of the base thepopulation was appreciable, reaching a peak of 750 in 1970. However,with the decline of military activities and the departure ofthe u.s. Coast Guard in 1977, the population outside Metlakatlawas reduced to its present size of about 60 persons.As shown in Exhibit 1, the number of the island's year-roundresidents has fluctuated over the years. The founding of theCommunity brought rapid growth and population was recorded at 823in 1890. During the next 40 years, the population fluctuatedbetween 400 and 600, reflecting somewhat uneven success inestablishing a stable social and economic base. From 1930 to1970, however, the population increased steadily with only a smalldecline between 1950 and 1960. The population on the islandpeaked around 1970 with a total of about 1,800. With the departureof the u.s. Coast Guard in 1977, and other recent reductionsin Federal Government activities, the present population is about1,100. Although the population is very young, recent birth rateswere low due to the emigration of young adults in search of betteremployment opportunities outside the island. In addition, theseasonality of employment on the island creates an unemploymentrate which is high, averaging about 30 percent.Three scenarios of population projections are presented inExhibit 1. These growth scenarios (low, most likely, and high)reflect different assumptions on future economic activities whichare presented in the following paragraphs and the Community'sdecisions on immigration. Under the most likely scenario, thepopulation will increase from 1,100 in 1980 to 1,240 in 1990 and1,400 in 2000. This scenario corresponds to a continuation ofpresent population growth rate (an average of 20 births and 8deaths per year, per 1,000 residents), and economic opportunitiesto keep residents employed. The low scenario, with a populationof 1,300 by year 2000, reflects continuation of depressed lumbermarkets and no new industries. The high forecast, with apopulation of 1,500 by year 2000, assumes rapid development offorest products and fisheries industries, new small businessventures, and development of the buildings at Annette airport forcommercial use.EconomyFishing and logging are the major income-producing activitieson the island. The Metlakatla Indian Community owns, operates andleases these income producing enterprises. Other employers are11-2

also important to Metlakatla's economy. However, the largest one,the Federal Government, has recently terminated most activities onthe island. Because of the seasonal nature of some activities,the employment rate falls in winter, and peaks in summer. Thework force varied between 349 and 753 with an average of 511 forthe year 1977. Exhibit 2 summarizes seasonal employment byactivity.Major Economic ActivitiesFisheries. Fishing has long played a vital role in theculture, subsistence, and income of the Indian Community.Historically, salmon have been the most important by far of allfish harvested. Other species, such as herring, halibut, clams,and crabs are also harvested around Annette Island. Harvestingemployment fluctuates from a low of about 20 in winter to a peakof 100 in summer.Another important aspect of the island's fisheries is theprocessing activity. Since 1924, the Community-owned AnnetteIsland Packing Company (AIPC) has operated a cannery. In 1971, acold storage facility was added. The packing company is a significantemployer. As many as 200 persons are employed in the canneryduring the peak season of July-August. Cold storage operationsare less cyclical and occur mostly during the months ofApril through October, with an average of 60 persons employed. Inwinter, the work force is reduced to a minimum.The Metlakatla Indian Community is also engaged in fisheriesresource enhancement with the operation of the new Tamgas CreekHatchery. In 1980, about 700,000 juveniles were released. Expansionof the hatchery to incubate about 50 million eggs annually isplanned for 1984.Forest Products. Logging on the island is by outsidecontractors emploYlng mostly non-residents. Consequently, thetimber resources of the island provide a relatively small amountof employment, but substantial revenues to the Community areobtained from the timber sale.Timber processing is the largest employment sector. Thecommunity-owned sawmill, leased to the Louisiana Pacific Corporation,processes cants for shipment to Japan, and sends chips tothe Ketchikan Pulp Mill. The mill usually operates on two shifts,year-round. In 1980, it employed an average of 100 persons toprocess about 70 million board feet (MMBF) of timber. The supplycomes from Thorne Bay on the east coast of Prince of Wales Island.In 1981, due to the recession in world markets, the mill shut downin September, and it processed only 32 MMBF and 28,000 tons of drychips. For 1982, it is expected that the mill will start opera-1I-3

tion in June or July. However, with the recent expansions associatedwith the processing of small logs, the mill has the potentialto employ as many as 140 persons and increase its production to100 MMBF.Other Activities. Very little activity occurs in other typesof manufacturing. Only a few persons are engaged in Native artsand crafts, and only from time to time. Construction activitieshave kept an average of 15 people employed. Employment in thetransportation sector is associated with the forest products industry.An average of 50 persons are employed in this sector.Because of the proximity of the large commercial sector in Ketchikan,employment in trade and services is quite low, averaging 40jobs. With the departure of the U.S. Coast Guard Air Station,employment from the Federal Government has dropped dramatically toabout 20 full-time jobs. Nearly all the State of Alaska employmentis associated with the Annette Island School District, withan average of 30 persons employed. As a result of increasedlevels of public services, employment in the local government hasincreased rapidly to about 80 jobs.Future Economic ActivitiesAn estimate of future potential economic activities is presentedto provide a basis for the projections of electric powerand energy demand. This estimate is based on the best availabledata and assumptions to insure the economic development of MetlakatlaIndian Community.Fisheries. The Community is proceeding with several enhancementefforts to'counter the large natural fluctuations in salmonruns from year to year, and to avoid the swings in seasonalemployment. The fish hatchery, financed by the Bureau of IndianAffairs, will help restore depleted salmon runs. However, withthe restrictions in federal spending, future development stagesmight be cancelled, reduced or delayed. At full development theCommunity fishermen should be able to reap harvests rangingbetween 400,000 and 700,000 which would increase the current catchby about 50 percent. The Annette Island Packing Company plans toincrease the cold storage capacity by 50 percent, to start shellfish processing within the next two years, and is looking into thepossibilities of a more finished product that could be solddirectly to supermarkets.Forest Products. Due to depressed markets, no sale of roundlogs is forecasted for the near future by the Community, and thesawmill is not expected to reopen until June or July 1982. However,Annette Island can expect long-term forest products employmentto hold up, although the year-to-year fluctuations will probablycontinue. Existing activities at the sawmill will continue11-4

to increase due to the new equipment that has been recently installed.Employment could increase as much as 40 percent. Otheractivities could include further processing of hemlock and cedarproducts to shakes, shingles, lumber for housing construction andcabinet making. These activities could also lower local housingconstruction costs and spur increased construction employment.Other Activities. In 1982, 24 HUD housing units and severalhouses are scheduled to be under construction. In addition, 40more units are under consideration for the period 1983-1985. TheCommunity has a swimming pool and a vocational shop under construction.A new boat harbor has been constructed, and docks andutilities are scheduled for construction in 1982. These facilitieswill provide the needed installations to increase and maintainthe fishing fleet. It will also provide jobs for localnatives and may attract off-island sailors.Tourism is considered as a promising activity for economicdevelopment. However, at the present time, there is a lack ofadequate overnight accommodations and no "tourist package" has yetbeen developed. The rebuilding of the Longhouse - a cultural andcraft center - will enhance the Community efforts to revitalizethe Native arts and crafts, and attract visitors.Opportunities are also available for the establishment of newbusiness ventures that would offer the needed goods and servicesthat are presently purchased outside the island. The Community isalso exploring alternatives to redevelop the facilities formerlyused by the U.S. Coast Guard. Possibilities include a foreigntrade zone, an industrial assembly plant, a fish-net manufacturingplant, and a distribution center for a foreign firm. This projectcould be a major new source of income and employment for thefuture.Another potential activity is the mlnlng sector. Previoussurveys of mineral resources reveal a potentially valuable depositof barite, and marginal deposits of silver, lead, and zinc. However,further studies and field explorations will be necessary todetermine the economic viability and environmental ~oncerns.Energy ConsumptionEnergy SectorAn energy use inventory was conducted in order to gain anunderstanding of the total consumption, and the relative importanceof electricity. Exhibit 3 shows the fuel consumption byfuel type and end-use for the year 1980. Approximately 500,000gallons of diesel, 100,000 gallons of fuel oil, and 60,000 gallonsof gasoline were consumed. In addition, an estimated 1,500 tonsII-5

of wood were used for cooking and heating. The electric energygenerated by Purple Lake has a fuel equivalent of about 1,250,000gallons, which represents 62 percent of the total energy consum?­tion. The total electric energy consumption accounts for aboutthree-fourths of the total energy consumption. Therefore, thereis limited potential for transferring other forms of energy consumptionto electric energy.Energy BalanceExhibit 4 presents the energy balance for 1980. In order tocompare the consumption of different end-uses, the fuels werereduced to a common denominator, the British thermal unit (Btu).The total energy consumption was about 155 billion Btu. Due toconversion losses, and the electric transmission and distributionlosses, the "useful" energy was about 80 billion Btu. Hydroelectricenergy from purple Lake provided about 53 percent of thisuseful energy.Existing SystemsElectric Power SectorThe electric utility, Metlakatla Power and Light, operatestwo generating plants. The Purple Lake Hydroelectric Plant hasthree 1,000 kW generating units. The first two units were installedin 1956, and the third in 1962. The Quarry Plant has two1,500 kW diesel driven generators. The first unit was installedin 1967, and the second unit in 1970. The diesel units meet thelarge fluctuations of the sawmill operations and supplement thehydro plant.In addition, the sawmill has four stand-by diesel units (900,750, 450 and 350 kW) which are used during repairs or maintenanceat the Quarry Plant. These diesel units have provided only about5 percent of the sawmill's electricity demand. They are notinterconnected to the island's distribution network.Monthly Rate ScheduleIn April 1979, there was a major increase in electricitytariff. The monthly residential rate increased from 5.5 cents forthe first 200 kWh to 7 cents, and from 2.8 cents for the next 1300kWh to 3.7 cents. A similar increase affected the commercial andindustrial sector. In March 1981, the base rate for the first 200kWh was kept the same at 7 cents, but the rate for the next 1,300kWh was increased to 4.7 cents, and to 3.5 cents for over 1,500kWh. For the small commercial sector, the monthly rates are 7cents for the first 200 kWh, and 5.5 cents over 200 kWh. For thelarge commercial sector, the monthly rates are 7 cents for theII-6

first 5,000 kWh, then 6 cents. For the sawmill, the rate includesa fuel surcharge, and averages about 15 cents per kWh.Historical Electric Energy GenerationHistorical data on annual energy generation, for the period1975-1980, are presented in Exhibit 5. In 1980, the total generationwas 17,688 MWh, an increase of 11.4 percent over the 1979level, but only 1.5 percent over the 1975 level. In 1980, thehydropower plant generated 14,994 MWh which represents 85 percentof the total generation. During the period 1975-1980, thehydropower plant generated an average annual energy of 13,773 MWh.The annual variation in hydropower generation is related to theprecipitation on the island. For example, in 1978, precipitationwas 20 percent below average, and the energy generated was 8percent below average. The diesel plant provides the additionalenergy requirements. The diesel generation was 2,694 MWh in 1980,and varied between 1,433 MWh in 1976 and 3,472 MWh in 1977.Monthly net energy generation for the years 1978, 1979, and1980 is presented in Exhibit 6. In general, generation requirementsare about 30 percent greater in winter than in summer. Thepeak demand also occurs in winter. In 1980, the peak demand was4,770 kW. The summer peak was 3,740 kW. The annual load factorwas 42.3 percent in 1980. Monthly load factors are generallyhigher during winter months, averaging 50 percent. In 1980, thesummer load factor was about 44 percent.Historical Electric Energy ConsumptionIn 1980, the total electric energy consumption sold by MetlakatlaPower and Light was 14.9 million kWh, and the peak demandwas 4,770 kW. Except for the year 1979, when the consumption wasonly 12.6 million kWh due to an increase in electricity rates, theaverage annual consumption was about 14.6 million kWh for theperiod 1975-1980. Four consumer categories were developed fromthe data available at Metlakatla Power and Light. Thesecategories are: residential, public buildings and lighting, smallcommercial, and large commercial and industrial. Historical dataon annual energy consumption by consumer categories are presentedin Exhibit 5. Monthly consumption values from January 1980 toSeptember 1981 are presented in Exhibit 7.In the residential sector, the number of customers increasedfrom 303 in 1975 to 350 in 1980. The annual energy consumptionper customer decreased from 21,820 kWh in 1975 to about 18,500 kWhin 1977 and 19,100 kWh in 1978. Because of an increase of about30 percent in the cost of electric energy in 1979, consumptionfell to 16,300 kWh per customer. In 1980, residential consumptionreturned to earlier use patterns. The average consumption wasII-7

about 18,500 kWh per customer. It must be noted that the residentialconsumption is high, due to the use of electric heat. Bycomparison, the average residential consumption per customer inRetchikan was about 8,800 kWh for 1980.The energy demand for the small commercial sector has beenrelatively stable, except for the year 1979. In 1980, the demandwas 1,472 KWh. The large commercial sector consists of the followingcustomers: Leak's Market, FAA Vortac, RCA Alascom, USCGHangar, U.S. Weather Bureau, Western Airlines, and GTE LenkurtStation. With the departure of the u.S. Coast Guard and reductionsin the other activities, this sector has sharply decreased.In the industrial sector, there are only two customers:Annette Hemlock Mills and Annette Island Packing Company. In1980, the total electric energy consumption was about 4,000 MWhfor the sawmill and 1,000 MWh for the cannery. However, thedemand can fluctuate by as much as 30 percent from year to year.Future Electric Energy DemandThree projections of electric energy demand are developed,based on current use and alternatives in the potential economicdevelopments. The most likely scenario assumes a continuation ofpresent activities and includes the realization of projects underdesign and being planned by the Community. The low scenarioreflects a more conservative growth, with some planned developmentdelayed. The high scenario assumes full operation and expansionof the existing industries, installation of new business ventures,and development of the buildings at Annette airport for commercialuse.The forecasts are based on estimated growth in four sectors:residential, public buildings and lighting, small commercial, andlarge commercial and industrial. The annual energy demand isexpected to increase from 15.2 GWh in 1980 to about 23.4 GWh in2000 under the most likely scenario. The energy demand would be26.8 GWh under the high scenario and 19.1 GWh under the low scenario.Based on historical data, gross energy generation isexpected to be about 15 percent higher. Exhibit 8 summarizes theprojections. The power market forecast is shown graphically onExhibit 9. Detailed descriptions of these projections are presentedin the following paragraphs.Residential. In 1981, there were 360 customers. This numberwill increase to 390 by the end of 1982 as a result of the 24 HUDunits and 6 houses under construction. Although, a total of 40more HUD units are under consideration for the period 1983-1985,only an additional 20 customers are expected under the most likelyscenario for the period 1983-1985. An additional 40 customers are11-8

projected for the high scenario, and 10 for the low scenario. Forthe period 1985-2000 an annual increase of 3 customers is projectedfor the most likely scenario, 2 for the low scenario, and 5 forthe high scenario.Heating load is a major part of the demand and therefore theforecast is sensitive to the relative price of wood and electricheat. Recent trends in the 1981 residential energy consumptionhave shown a slight reduction in electric consumption due to theincreasing installation and use of wood stoves. In Metlakatla,about 75 percent of the houses are equipped with wood stoves.Based on an average cost of $70 per cord, a weight of 3600 poundsof wood per cord, a heat content of 4000 Btu per pound, and a woodstove efficiency of 50 percent; the equivalent cost of electricheat would be 3.3 cents per kWh. Although the cost of wood forheating is more attractive,-the supply of wood is now dependent onthe logs found on the near-by beaches. Other factors such aswillingness to pay for a cleaner form of heat, and a stabilizedcost of power are expected to balance the increased demand forwood. (A detailed economic and financial sensitivity analysis ofresidential heating cost on load growth is presented in Chapter Vand VI.) In addition, new housing construction will most likelybe provided with better insulation, efficient wood stoves, andelectric energy-efficient appliances. As a result, the per customerconsumption is expected to decrease slightly. Under the mostlikely scenario, the per customer consumption is reduced to 17,000kWh in 1985 and 16,000 kWh in 2000. For the low scenario, it isprojected to be 16,000 kWh in 1985, and 15,000 kWh for the period1990-2000. For the high scenario, the annual consumption is keptconstant at 18,000 kWh for the period 1985-2000.Public Buildings and Lighting. There will be a large increasein thlS sector rn-the next two years, with the addition ofan all-electric indoor swimming pool, a vocational shop, harborfacilities, and new streets. Discussions with the design companyof the swimming pool indicate a peak demand of 390 kW for heating,ventilation, and lighting. A load factor of 30 percent and anannual energy demand of 1,020 MWh are projected for the swimmingpool, under the most likely scenario. The vocational shop willinclude a wide variety of power tools, welding machines, woodworkingequipment, and other electric motors. A peak demand of 100kW, and an annual energy demand of 220 MWh are projected. The newharbor facilities will include docks, lighting, repair and maintenancefacilities. An annual energy demand of 100 MWh is projected.New streets are under construction to provide residentiallots for the HUD housing development program. An additional 20MWh is expected in 1985 for street lighting. An average annualgrowth rate of 1 percent is projected for the energy demand of theexisting facilities. To summarize, an additional energy demand ofII-9

1,404 MWh is projected in this sector for 1985 under the mostlikely scenario. With a stable and economic cost of power, it isalso projected that the schools and other public facilities willprogressively shift from oil heating systems to electric heatingin the long term. An average annual growth rate of 2 percent isprojected for the period 1985-2000 under the most likely scenario.For the high scenario, it is projected that there will be a greateruse of the existing and new facilities and an average annualgrowth rate of 2.5 percent is projected for the period 1985-2000.For the low scenario, an average annual growth rate of 1 percentis projected for the period 1985-2000.Small Commercial. With an improved economy, the trade andservices sector of the island is expected to attract more activities.For the most likely scenario, an average annual increase of1 percent is forecasted. For the high scenario, it is assumedthat some of the trade now performed in Ketchikan will be availableon the island. These new small business ventures can bedeveloped under favorable economic conditions. An average annualgrowth rate of 2 percent is forecast. For the low scenario, theaverage demand increases 1 percent until 1985. For the period1985-2000, an average growth rate of 1 percent is also forecasted.Large Commercial and Industrial. In the near future, themajor increase in electric energy demand will corne from the twoexisting industries. The cannery is expected to increase its coldstorage capability by about 50% within the next three years anddiversify its production to offer year-round employment. Thiswill result in an additional electricity demand of about 30 percentby 1985 under the most likely scenario. When the sawmillreopens and operates under its full capacity, the energy demandis expected to increase rapidly due to the recent expansions ofthe mill. A 40 percent increase is forecasted under the mostlikely scenario for 1985. Further processing of hemlock and cedarproducts for residential construction are also under consideration,and a progressive development of these activities is projected.No major changes are expected in the near future for theother large commercial customers. In the long term, the redevelopmentof the building facilities at Annette airport could bring amajor increase in the electricity demand. This potential developmenthas only been included in the high scenario, under which thecommercial demand in year 2000 is nearly twice the demand of 1980.Under the most likely scenario, the demand is expected to increase,after 1985, at an average annual growth rate of 2 percent.The low scenario projects only an average annual growth rate of 1percent.II-IO

Future Electric Peak DemandAs shown in Exhibit 5, the total 1980 peak demand was4,770 kW. The largest load demand is the sawmill which had a peakof 1,350 kW. With the expansion of the mill, it is expected thatthe peak demand at the mill will increase to about 2,000 kW whenthe sawmill is in full operation. The other major increase willcome from the indoor swimming pool and the vocational shop. Otherdevelopments such as the fish hatchery, the harbor, and the potentialrehabilitation of the Annette airport facilities will alsohave significant loads. No major changes are expected in theresidential and small commercial sector. Annual load factors areexpected to increase slightly from 43 percent in 1980 to 45 percentin 1985, reflecting a greater diversity in electric energydemand and year-round operations of the industrial sector. After1985, the annual load factor is expected to remain constant.These annual load factors are based on gross energy generation.As a result, the peak demand is expected to increase to about5,580 kW in 1985 under the most likely scenario, with a lowscenario of 5,040 kW, and a high scenario of 6,100 kW. In year2000, the peak demand is expected to be about 6,820 kW under themost likely scenario, 7,820 kW under the high scenario, and 5,560kW under the low scenario.II-ll

Chapter IIIALTERNATIVE PROJECTS FOR ELECTRIC GENERATIONIn addition to the Chester Lake alternative, presented in thefollowing chapter, four alternative means of meeting the forecastof increasing electrical demand on Annette Island have been studiedand are presented in this chapter. The four alternative sourcesof power are diesel generation, expansion of the existingPurple Lake Hydroelectric Project, the Triangle Lake HydroelectricProject, and woodwaste generation.Diesel GenerationThe diesel alternative consists of continued use of the twoexisting 1.5 MW diesel generators at the Quarry Diesel Plant. Forthis study, it was assumed that additional 1.0 MW or 0.5 MW unitswould be commissioned in each year that the forecast peak demandwould otherwise exceed the capabilities of the existing generatingfacilities and that the existing and future units would be replacedat the end of 20 years of service.Purple ~ Hydroelectric Project ExpansionPurple Lake presently serves as the reservoir for hydroelectricgenerating facilities located near sea level on Tamgas Bay tothe west of the lake. The Purple Lake Expansion Alternative wasinvestigated to determine if the project could be modified toprovide power and energy production. In November, 1981 a reconnaissancevisit to the site was made by a team of engineers,geologists and an environmental scientist. Three alternativeexpansion plans were subsequently developed:1. Increasing the height of the existing dam to raise thelake level,2. constructing a new dam downstream of the existing dam,which would raise the lake level and also increase thecatchment area of the Purple Lake reservoir by about 0.8square miles, and3. Increasing the project's peaking capability by adding afourth generating unit at the present powerhouse.Under Plans land 2, the present lake level would be increased byno more than five feet. No additional transmission line nor newaccess road would be required for any of the expansion plans.111-1

Environmental AspectsTerrestrial. Some terrestrial habitat would be inundated bythe higher lake level in Plans 1 and 2. A new dam would causegreater loss of terrestrial habitat than raising the existing darn,since a new dam would flood part of the presently unimpounded areadownstream of the existing dam. However, the amount of terrestrialhabitat lost would not be significant in either case. Plan 3would have no impact on terrestrial habitat.Aquatic. Purple Lake is one of the eight lakes on AnnetteIsland stocked with rainbow trout (Salmo gairdneri) by U.S. Fishand Wildlife Service (USFWS) between 1973 and 1975. AlthoughPurple Lake yielded no trout during a subsequent survey, it ispossible that rainbow are present. Two other lakes in the PurpleLake drainage basin are reported as not supporting any game fish(USFWS 1976).11Raising the water surface level of Purple Lake a few feetwould not be expected to have significant adverse effects on theexisting rainbow trout population, if any, nor on other aquaticorganisms. Expansion Plan 3, which does not involve raising thelake level, would not have any effect on the lake'S aquatic population.Office inspection of USGS topographic maps indicated thepossibility that the Purple Lake system might have a drainageconnection on the eastern end of the basin to Crab Creek, whichflows out of the Dubuque Lakes area and into the head of Crab Bay.Crab Creek is a catalogued anadromous fish stream (ADFG 1968)11and is known to support spawning runs of pink, chum, and cohosalmon (Oncorhynchus gorbuscha, o. keta, o. kisutch). Pink salmonescapement counts in Crab Creek !or-r972-1976 indicate a pinksalmon resource varying between approximately 4,000 and 21,000fish annually (USFWS 1976). Field investigations in the fall of1981 revealed that no surface drainage exists between the PurpleLake system and Crab Creek. There may be some subsurface leakagethrough the limestone formation at the eastern end of the basinwhich contributes to groundwater in this area. However, raisingthe level of Purple Lake and/or placement of a new dam to increaseU.S. Fish and Wildlife Service. 1976. Lake and stream inventoryof Annette Island. Draft report provided by USFWS Ketchikanoffice.~/Alaska Dept. of Fish and Game. 1968. Catalog of waters importantfor spawning and migration of anadromus fishes. Region 1.97 pp.111-2

the catchment area of the Purple Lake reservor would not be expectedto have any effect on fishery resources in Crab Creek.Special Biotic Resources. Based on the assumption that thefauna and flora of the Purple Lake area are essentially identicalto those of the Chester Lake area, development of the Purple Lakealternative would not be expected to have any effect on proposedor listed threatened or endangered species (see Appendix C).Although Annette Island supports a large population of residentnorthern bald eagles (Haliaetus leucocephalus alascensis),most eagle nests in SOutheast Alaska are within about 300 feet ofsalt water, so that nests would not be expected near Purple Lake.The Purple Lake expansion alternative would not be expectedto have any adverse effect on estuaries, agricultural land, orrange land. Effect on wetlands, floodplains, and forest landwould be expected to be minimal.Recreation. Implementation of the Purple Lake expansionalternative would not be expected to affect present recreationuse.s~cial Features. No known historical, archeological, orcultur~ resources would be affected by development of the PurpleLake alternative.Raising the existing dam and the level of Purple Lake by afew feet would change the present scenic/esthetic character of thearea only slightly. Placement of a new dam to raise the lakelevel would have greater visual effect than would raising theexisting dam, but for either case only minimal impact would beexpected.Water Quality and Quantitt. Raising the existing dam orplacing a new dam would probab y cause short-term increases inturbidity in the east end of Purple Lake, in the stream drainingthe lake, and in the two smaller lakes in the eastern end of thedrainage during construction. No significant long-term impactswould be expected. The Plan 3 alternative is not expected to haveany effect on water quality or quantity at Purple Lake.Geologic ASpectsA natural damsite exists downstream from the outlet of PurpleLake, about 4000 feet from the existing dam on Crab Creek. Thislocation has a relatively narrow rock controlled valley profile,with a very prominent rock ridge rising to over 500 feet elevationon the left abutment. River elevation at the proposed site isabout 280 feet.111-3

The bedrock is report~d to be leuco-trondhjemite of theAnnette Pluton (Berg, 1972) with sound smooth rock slopes on thereservoir rim. Some 300 feet downstream of the proposed dam axisis the contact with foliated intrusive rocks (diorite), and 3000feet downstream is the contact with recrystallized limestone rockswhich appear to drain and underlie the eastern outlet of SinkLake.During the reconnaissance fly-over it was noted that there isa very thin cover of overburden in the river valley and on theright abutment, and that there are stable smooth rock outcropsforming both abutments.See Geologic map of Annette Island, Alaska USGS (Henry C.Berg, 1972).Hydrologic AspectsPrior to the construction of the Purple Lake dam, the U.S.Geological Survey collected stream flow records for a period ofnine water years from OCtober 1947 through September 1956.According to these records, presented in Table III-I, theaverage annual runoff to Purple Lake during the 9 year period was179.6 inches over the total 6.8 square mile drainage area upstreamof the gaging station.Precipitation records at the nearby Annette airport are availablefor 39 consecutive years starting February 1941. Monthlyvalues of these records are given in Table 111-2.These records are used to derive average monthly ratios betweenrunoff at Purple Lake and precipitation at Annette airport.The U.S.G.S. records at Purple Lake are converted into equivalentinches of runoff over the 6.8 square miles drainage area, and arepresented in Table 1II-3 with the corresponding precipitationrecords of Annette airport. Average monthly ratios are computedby dividing the total monthly runoff at Purple Lake by the totalmonthly precipitation records for the period 1948-1956. Theseratios are then used to derive monthly runoff for the Purple LakeReservoir for the periods October 1941 - September 1947 andOCtober 1956 - September 1980, using the precipitation recordsat Annette airport, and a drainage area of 6.52 square miles atPurple Lake Dam. The U.S.G.S. stream flow records at Purple Lakegage for the period October 1947 - September 1956 were adjustedfor the smaller drainage area at the Purple Lake Dam by the ratioof 6.52 divided by 6.8. The results are presented in Table 111-4.111-4

Table 111-1STREAM FLOW AT PURPLE LAKE GAGE -Acre-FeetU.S.G.S RECORDSWater-Year OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL1947-1948 10,440 4,960 1,110 8,800 3,220 3,870 2,060 3,110 2,530 1,720 2,080 8,640 60,2601948-1949 10,150 10,310 5,400 6,810 1,430 4,120 11,150 5,640 5,500 3,690 5,890 7,010 77,2201949-1950 11,810 8,460 3,050 3,490 3,210 4,280 4,760 5,050 3,470 5,520 5,520 1,840 66,5201950-1951 4,920 4,410 7,110 5,020 3,320 3,950 3,100 4,990 6,060 1,120 1,630 2,050 47,7401951-1952 5,750 4,460 4,610 4,300 5,180 4,000 5,950 4,610 3,590 2,460 2,710 6,550 54,2]01952-1953 6,410 5,760 4,940 ],150 7,650 6,570 5,310 1,100 1,190 2,880 1,300 6,800 59,7201953-1954 12,290 10,980 10,410 3,840 11,190 2,790 4,560 6,060 5,630 3,090 714 3,290 74,9001954-1955 • 1,420 12,310 14,200 1,910 6,920 3,170 6,590 6,120 4,200 1,280 6,720 4,710 85,6101955-1956 12,960 4,680 3,]20 1,390 3,270 1,710 6,260 7,360 6,210 2,920 6,910 ] ,090 60,080Drainaqe area of Purple Lake gaqe• 6.8 square miles

Table 111-2PRECIPITATION AT ANNETTE AIRPORTYear JAN fEB MAR APR HAY JUNE JULY AUG SEPT OCT NOV DF.C ANNUAL1941 2.95 9.66 5. J4 4.01 6.41 4.61 1.66 6.61 14.98 11.25 6.901942 8.20 ].04 9.39 1.85 ].91 1.0] 1.12 3.29 4.]2 16.11 12.14 9.85 RO.911943 9.26 11.69 2.29 6.94 1.22 2.05 8.16 6.41 1.51 9.8] 14.91 12.88 99.931944 11.66 4.94 11. J1 1.26 8.18 ].]2 4.42 5.84 1.91 19.83 11.0] 8.5] 104.951945 11.12 1.8] 11. 26 1.56 1. 61 1.19 6.95 0.62 9.15 12.92 1.00 1.40 91.211946 8.]6 10.52 13.01 8.91 1.34 4.02 8.61 4.11 12.]9 10.8] 9.61 11.29 103.181941 11.14 6.66 1.]2 8.14 ].61 4.88 5.9] 1.6] 9.09 20.13 1.54 14. ]5 106.421948 14.22 6.6] 4.64 1.23 2.25 5.10 ].12 5.60 16.9] 19.10 12.09 1.91 99.421949 9.98 6.45 1.19 21. ]5 4.98 9.14 1.02 6.50 11.51 20.38 13.54 5.]6 124.661950 0.11 9.]2 1.]5 1.99 8.15 2.19 10.11 10.16 10.28 9.51 6.02 11.21 93.621951 8.56 1.13 10.45 6.91 4.66 4.91 2.68 4.88 5.64 9.44 8.56 6.90 80.841952 10.15 1. ]] 9.64 8.00 ].26 4.14 2.91 6.21 13.62 8.9] 8.52 6.16 89.53195] 5.]0 12.21 10.26 5.19 10.36 2.21 ]. J1 ].90 11.99 lB.06 15.80 16.22 115.591954 1.41 13.88 5.83 1.99 5.00 6.39 4.01 0.71 5.]0 lB. 43 16.18 20.19 Ill. 381955 1. ]] 11.11 11.42 10.51 11.18 8. J1 2.56 16.58 11.99 ll.98 12.12 4.38 150.28 .1956 5.49 10.19 9.60 13.80 10.92 10.40 5.28 11.16 5.15 20.65 21.45 18.13 149.421951 ].15 8.ll 6.90 10.48 5.89 6.91 1.18 6.05 1.51 9.84 23.65 11.81 114.401958 20.69 9.18 ].25 9.]1 11.64 1.15 ].98 20.12 15.13 34.81 21.04 11.55 169.111959 12.18 9.95 2].51 11.09 8.81 6. JJ 10.85 10.51 14.60 24.96 28.09 28.90 189.901960 18.29 11.4] 2].51 14.08 5.02 5.69 9.06 ].51 10. J1 21.6] 8.01 13.49 144.151961 9.69 1].81 9.12 1.41 ].40 5.18 2.88 1.50 5.82 22.82 15.46 14.82 118.511962 19.26 0.13 6.08 12.19 2. ]] 1.64 2.98 8.20 10.50 15.12 15.28 15.15 116.061963 8.15 16.52 4.21 6.84 3.61 8.34 5.60 0.19 lfi.96 19.44 10.50 14.65 115.611964 4.94 13.22 11.06 8.11 4.96 ].82 6.2] 10.49 9.16 8.62 9.81 9.81 120.891965 15.46 lB.06 ].00 9.81 8.24 4.94 3.14 ].91 2.52 21.15 11.41 13.12 121.681966 11.19 11.12 1.13 ].22 14.68 2.2] 2.11 4.81 9.40 11.90 6.11 9.45 110.611961 9.25 15.32 ].01 2.33 1.91 2.98 8.18 10.25 15.51 11.90 6.02 12.11 11. 43196R 11.05 5.80 10.4] 13.63 1.51 4.13 4.81 6.42 15.19 18.81 14.09 4.81 110.801969 ].]9 3.40 ].50 10.68 4.56 2.8] 6.09 11.25 4.90 9.56 24.89 16.25 101.301910 1.16 8.03 1.8] 8.11 11.21 5.50 5.16 1.88 11.82 15.29 ].61 6.82 99.621911 1.59 10.10 9.49 9.96 4.24 3.61 0.56 8.56 1.]0 14.04 13.64 8.]] 98.031912 8.20 8.41 10.54 8.18 5.18 4.95 4.]6 9.90 4.18 13.46 10.11 9.43 98.101913 9.18 9.66 8.83 8.85 9.50 5.96 5.46 4.61 12.81 15.19 5.37 10.6] 101.311914 6.42 11.91 ].01 8.02 1.10 5.19 ].10 2.54 1.46 22.49 16.05 15.95 109.901915 11.]0 1.51 4.4] 1.95 3.92 5.56 4.94 6.51 9.93 8.82 9.20 14.28 95.011916 16.01 9.94 11.92 8.19 9.18 4.44 6.61 1.56 13.15 11.40 10.02 15.49 125.111971 5.88 16.50 1.46 1.ll ].08 6.46 4.15 2.01 5.66 15. Jl 11.68 5.94 91. 441918 J. 01 6.10 1.61 5.84 ].92 0.95 1. 98 6.00 11. 66 15.95 14. ]9 11.35 88.821979 6.51 1.01 9.69 2.24 9.81 6.86 2.44 1.11 12.42 10.35 10.20 12.34 92.411980 4.89 8.14 9.12 16.88 4.55 0.81 6.12 6.56 8.09 18.35 11. J1 14.11 116.19RecordH('all 9.85 9.52 8.91 8.18 6.25 4.81 5.08 6.92 9.92 11.09 12.63 12.20 112.02

Table 111-]ANNETTE PRECIPITATION VS. PURPLE LAKE PRECIPITATION RUNOFF(inches)Annette/Water-Yearpur~; LakeNOV DEC JAN FED MAR APR MAY JUN JUL AUG SEP TOTAL1947-1948 20.13 7.54 14.35 14.22 6.6] 4.64 1. 23 2.25 5.10 3.12 5.60 16.93 101. 7428.79 13.68 19.77 24.26 8.88 10.67 5.68 10.40 6.98 4.74 5.74 23.82 163.411948-1949 19.70 12.09 7.91 9.98 6.45 7.79 21. 35 4.98 9.74 7.02 6.50 11.57 125.0827.99 28.59 14.89 18.94 3.94 11. 36 30.74 15.55 15.17 10.17 16.24 19. JJ 212.911949-1950 20.38 13.54 5.36 0.77 9.32 7.25 7.99 8.15 2.79 10.17 10.16 10.28 106.1632.7J 23.33 8.41 9.62 8.85 11.80 13.12 13.92 9.57 15.22 15.22 21.62 183.411950-1951 9.51 6.02 11.21 8.56 7.n 10.45 6.97 4.66 4.97 2.68 4.88 5.64 82.6813.57 12.16 19.77 13.84 9.15 10.89 8.55 13.76 16.71 3.09 4.49 5.65 131. 631951-1952 9.44 8.56 6.90 10.15 7. )) 9.64 8.00 3.26 4.14 2.91 6.27 13.62 90.2215.85 12.30 12.71 11.86 14.28 11.03 16.41 12.71 9.90 6.78 7.64 18.06 149.531952-1953 8.93 8.52 6.76 5.30 12.27 10.26 5.79 10.36 2.27 3.37 ].90 11.99 89.7217.84 15.88 13.62 8.69 21.09 18.12 14.64 21.23 3.28 7.94 3.58 18.75 164.661953-1954 18.06 15.80 16.22 7.41 13.88 5.83 7.99 5.00 6.39 4.07 0.71 5.30 106.66JJ.89 30.28 28.87 10.59 30.85 7.69 12.57 16.71 15.52 8.52 1.97 9.07 206.531954-1955 18.43 16.18 20.19 17. )) 11.17 11.4] 10.51 11.78 8.37 2.56 16.58 11.99 156.52]1.49 34.11 39.15 21.81 19.08 8.74 18.17 16.88 11.58 3.53 18.53 12.99 236.061955-1956 ]1.98 12.12 4.38 5.49 10.19 9.60 13.80 10.92 10.40 5.28 17.76 5.75 137.6735.74 12.90 9.15 3.83 9.02 4.72 17.26 20.29 17.12 8.05 19.05 8.52 165.65PrecipitationAnnette 156.56 100.]7 93.28 79.21 84.37 76.89 83.63 61. 36 54.17 41.18 72.36 93.07 996.45Purple Lake 217.89 183.23 166. J4 123.44 125.14 95.02 137.14 141.45 105.83 68.04 92.46 ll7.81 16ll.79Ratjo 1.519 1.826 1. 783 1.558 1.483 1. 2]6 1.640 2.]05 1.954 1.652 1.278 1.481 1. 619

Table 111-4 Sheet 1 of 2INFLOW TO PURPLE LAKE RESERVOIRAcre-FeetWater-Year OCT NOV DEC JAN FEB MAR APR MAY JUNE JULY AUG SEPT TOTAL1942 7610 7088 4336 4069 1488 4297 5418 3832 756 1017 1658 2228 4385743 8184 7649 6189 4595 5123 1041 4843 6969 1506 5178 3260 3904 5904744 4994 9432 8093 5786 2419 5203 5067 8475 24J8 2613 2943 4110 6157345 10074 6950 5360 5518 3814 5153 5216 1612 5721 4108 312 4719 5863746 6564 4410 4650 4148 5151 5981 6218 1293 2952 5125 2101 6389 5498241 5502 6055 7094 5528 3261 3350 5681 3485 ]584 ]505 ]844 4688 5557748 10012 4757 6816 84]9 ]088 3711 1976 . ]615 2426 1649 1995 8286 5683049 9734 9945 5179 6588 1171 3951 1069] 5409 5214 ]539 5649 672] 7405550 11]8] 811] 2925 3341 ]078 4105 4565 4843 3328 5294 5294 7519 6379451 4118 4229 6816 4814 1I84 3781 2973 4185 5812 1074 156] 1966 4578152 5514 4277 4421 4124 4968 ]8]6 5106 4421 344] 2359 2656 6281 5200653 6205 5524 4737 ]021 73]6 6]01 5092 7384 1141 2762 1247 6521 5727154 11186 105]0 10041 ]68] 10131 2616 4]73 5812 5]99 296] 685 3155 7183455 10952 1186] 13618 7586 6636 ]0]9 6]20 5869 4028 1228 6444 4517 8210056 12429 4488 3184 Ill] 1I]6 1640 600] 1058 5955 2800 6627 2963 5761651 10491 13515 11]92 1861 4069 1I58 7314 5686 5119 4244 ]048 ]873 7377058 4999 14902 11229 10267 4188 1487 6491 112]6 845 235] 10440 7802 8684559 11715 13257 11028 6044 4872 10186 7140 8504 4649 6414 5326 7529 10386460 12681 11699 18159 15120 5596 10186 9826 4846 4179 5]56 1769 5348 11136561 10989 5041 8416 4808 6161 4448 5111 3282 ]804 1702 3779 ]001 6126862 11593 9141 9112 9557 ]57 2182 8501 2249 5611 1762 4132 5415 11018

Table 111-4 Sheet 2 of 2INFLOW TO PURPLE LAKE RESERVOIRAcre-FeetW::ter-Year OCT NOV DEC JAN FEB MAR APR MAY JUNE JULY AUG SEPT TOTAL196] 7681 9628 9896 4044 8088 1926 4714 ]54] 6125 ]]10 ]98 8146 6815964 9876 6616 9205 1413 6473 5061 5660 4788 2805 ]68] 5285 50]] 7189865 9460 6219 6164 7671 8842 1:>73 6888 7954 ]628 1974 1970 1300 6]44]66 1379] 7227 8621 555] 5738 7b]9 2247 14171 16]8 16]7 2424 4847 7573567 9094 ]888 59]8 4590 7501 1377 1626 769] 2189 5190 5165 7998 6224968 9094 ]79] 7609 548] 2840 4773 9512 1516 ]0]] 284] ]2]5 78]] 6156469 9556 8878 ]060 1682 1665 1602 7454 4402 2078 ]600 5669 2527 5217370 .. 857 1568] 10211 ]851 ]932 ]58] 5660 10821 40]9 ]405 ]970 6095 7610771 7768 2275 4285 3766 5239 434] 6951 409] 2651 ]31 4318 ]764 4978472 71]] 8594 5234 4069 4118 482] 6128 5000 ]6]5 2577 4988 2465 5876411 68]8 6370 5925 485] 4730 4040 6176 9170 4]77 ]228 2]5] 6606 6466614 8022 ]]84 6679 3186 5811 1406 5597 74]] ]812 18]] 1280 ]847 5231075 11426 1011] 10022 5607 ]677 2027 5548 ]784 408] 2920 ]310 5121 676]876 4481 5797 9]50 8242 4867 5454 6114 9441 ]261 ]907 ]809 6781 7152477 5792 611] 973] 2918 8078 3414 5102 2973 4144 245] 1013 2919 5545278 7778 7359 ]732 1494 2987 ]510 4076 ]784 698 1052 ]02] 6013 4550679 810] 9067 7132 ]2]0 ]515 44]5 156] 9470 50]8 1442 1396 6405 6079680 5258 6427 1754 2426 ]985 4448 11780 4]92 595 ]972 ]]05 4172 58514TOTAL 340139 ]07102 29]725 200314 18195] 156958 228195 225091 136]99 116402 111681 199409 2519372AVEHAGE 8722 7814 7511 5136 4717 4025 5851 5772 . ]497 2985 ]]76 5111 64599Drainage area 6.52 square miles.

Based on the resulting estimated monthly inflows, the averageannual inflow to purple Lake is 89.2 cfs. If total utilization ofthe available water resource could be achieved, the total averageenergy that could be generated would be about 16,090,000 kWh peryear.The actual average gross generation for the years 1975through 1980 was 13,773,600 kWh and during this period the averageprecipitation at Annette airport was 101.63 inches. The 1975through 1980 precipitation is about 91 percent of the long termaverage precipitation of 112.02 inches. The potential generationfor 1975 through 1980 is estimated to be about 14,640,000 kWh peryear. The possible generation is about 6.3 percent above theactual generation for the period.Expansion Plan!: Raising Purple Lake DamThe existing Purple Lake dam and spillway weir could be raisedto provide additional storage in the reservoir. As noted, inthe previous discussion of Purple Lake hydrology, nearly all therun off in the catchment is being utilized for generation. Raisingthe dam would provide an estimated additional 520,000 kWh ofenergy annually but would not provide any new peaking capacity.Expansion Plan 2: Constructing ~ New Purple Lake DamAbout 0.9 miles downstream from the existing Purple Lake darnis a potential damsite which, if utilized, would increase theexisting drainage area to 7.36 square miles or about a 13% increase.Runoff from the increased drainage area would increasethe average annual potential energy to about 18,160,000 kWh, anincrease of 2,100,000 kWh. A dam at this location would increasethe lake area from 838 acres to about 892 acres. Its height wouldbe about 100 feet and its length about 600 feet as scaled from theUSGS map of 1:63360 Ketchikan (A-5) Alaska Quadrangle. Such a damwould cost approximately $10,000,000. It can be seen that thiswould not be an economically justifable alternative to ChesterLake since far less energy and no additional capacity would beproduced.Expansion Plan 1: Adding ~Fourth Unit At Purple LakeThe Purple Lake Project could be expanded by the addition ofa fourth unit at the existing powerhouse. For this study, theaddition of a 1.0 MW unit was investigated. Such an expansionwould require tapping the existing water conduit at the trifurcationjust upstream of the powerhouse and installing a new sectionof 30-inch diameter penstock. A fourth unit bay would be constructedadjacent to the existing south end wall of the power-111-5

house. The existing end wall would be removed and the powerhouseextended to enclose the new unit. The new unit would be a horizontalFrancis type turbine-generating unit similar to theexisting units. The cost of the expansion is estimated to be$2,600,000 at the January 1982 price level. (See Exhibit 10).The expansion would add an estimated average 300,000 kWh of energygeneration to system annually.ConclusionsAs described above, Plan 1 expansion of the Purple Lake projectby raising the existing dam and reservoir would increase thepotential average annual energy output of the project by onlyabout 520,000 kWh but would add no capacity to the existingsystem. Expansion of the project by constructing a new dam downstreamof the existing structure to increase the drainage area ofthe impoundment would yield an estimated average annual additional2,100,000 kWh, but at a cost that appears to be prohibitive atthis time. Neither of these plans of expansion is a viablealternative to the recommended plan of development.Expansion of Purple Lake Project by addition of a fourth unitwould increase the project's peaking capability by 1.0 MW and itsaverage annual energy output by an estimated 300,000 kWh. Of thethree expansion plans investigated it has the least potential foradversely impacting the environment. While the expanison providestoo little benefit to be considered an alternative to the ChesterLake Project it was given further consideration as a part of acombined development with the 1.5 MW Chester Lake run of riveralternative. Further discussion of this expansion plan and aneconomic comparision between the combined development and twoalternative developments of Chester Lake are presented in ChapterIV and V.Triangle ~ Hydroelectric ProjectAnother hydro power alternative investigated is the TriangleLake Project. Triangle Lake, (also referred to as Spine Lake orHassler Lake in some literature), lies in northeastern AnnetteIsland about two miles inland from Revillagigedo Channel. Thelake was identified as a potential hydro power resource in the1977 Definite Report on Chester Lake. The present study includeda site reconnaissance, performed in November 1981, by a team ofengineers, geologists and an environmental scientist.Project DescriptionThe Triangle Lake Project would develop the hydroelectricpotential between the lake and the sea at Hassler Harbor, seeExhibit 11 sheet 1. The lake level would be raised 10 feet from111-6

El. 383 to El. 393 by construction of a rockfill dam across thenatural outlet of the lake. The maximum gross head developedwould be about 370 feet. The project's installed capacity wouldbe 3.0 MW and its average annual energy generation is estimated tobe 11,000,000 kWh.GeologyThe proposed damsite would be located at the outlet ofTriangle Lake and above a rapids and waterfalls section with a 180feet drop. A low rockfill dam would be suitable for this site todevelop the head from the falls.The proposed dam axis has bedrock exposed in the river channelnear the top of the rapids section, and there are overburdenridges of sand, gravel and boulders of glacial debris on bothabutments. Bedrock at the site has a northwesterly foliationtrend, and is reported to be trondhjemite, igneous rock of theAnnette Pluton (Berg, 1972). The rock-controlled falls delineatethe northern limit of the resistant igneous rock at the contactwith the younger and weaker slates, and phyllitic greywackes(Jurassic age). Investigation would be req~ired to locate constructionmaterials.The proposed northeasterly penstock route to the powerhouseat Hassler Harbor is over hummocky ground with thin overburdenoverlying leucotrondjemite and local greenstone schist and finallygreywacke and limestones near the coast (USGS Geologic Map ofAnnette Island, Berg, 1972).DamThe dam would be a rockfill structure with a reinforced concretemembrane on its upstream face, as shown on Exhibit 11 sheet2. The dam's maximum height would be 30 feet, with crest atEl. 400, and its crest length would be about 350 feet. An ungatedconcrete ogee spillway would be provided in the central portion ofthe dam. The spillway crest would be 60 feet long allowingpassage of 4,300 cfs without overtopping the rockfill dam.Power ConduitWater for power generation would be conducted to the powerhousevia a reinforced concrete intake and steel penstock. Theintake would be constructed on the northeast bay of Triangle Lake.The intake would be provided with a trashrack and a bulkhead forclosure of the intake. The penstock would be about one mile longand 54 inches in diameter. The penstock route would be generallynortheast towards Hassler Harbor through heavily forested terrain.To minimize clearing requirements the penstock would be placed on111-7

edd ing in a shallow tr ...: .. ch throughout its leng th and covered wi thbackfill material. Reinforced concrete anchor blocks would beprovided at major bends. A cross section through the intake and atypical section through the buried steel penstock are shown onExhibit 11 sheets 3 and 4 respectively.PowerhouseThe powerhouse would be located on the shoreline of HasslerHarbor. The powerhouse would have a reinforced concrete substructureand a steel superstruct~re with a fabricated metal skin. Thepowerhouse is shown on Exhibit 11 sheets 5,6, and 7.Generating EquipmentThe generating unit would be a horizontal Francis type turbineand 3,000 kW generator. The unit would be capable of remoteoperation from the Purple Lake Hydro Project.Switchyard ~ TransmissionThe generator would be connected to a step-up transformerlocated in a small yard adjacent to the powerhouse. A singlecircuit 34.5 kV transmission line, 12 miles long, would connectthe project to the Metlakatla Power and Light distribution systemat Walden Point Road. The recommended transmission line routewould follow the required project access road along the penstockto the dam. From there the transmission line would continue onemile northeast to intercept an existing logging road. The linewould follow the logging road southwest to Port Chester and southalong the shoreline to Walden Point Road. While this routing isnot the most direct available, it has the advantage of followingexisting or required roads as much as possible, thereby reducingclearing requirements and facilitating construction and maintenanceof the line.ReservoirThe reservoir created by the dam will enlarge the presentTriangle Lake. By raising the lake level 10 feet to El. 393, thereservoir area would be increased to about 510 acres. The livestorage created would be an estimated 4,700 acre-feet. Clearingof the heavily forested shoreline of the lake will be required toreduce blockage of the intake by floating debris during projectoperation.CostsA reconnaissance level cost estimate was prepared for theTriangle Lake Project. Dimensions and elevations were based onIII-8

the 1:63360 USGS Ketchikan (A-5) Quadrangle map. The estimateincludes the direct costs of civil works, contractor's overheadand profit, purchase and installation of equipment, contingencies,engineering and owner's administration. The estimate is atJanuary 1982 price levels and excludes price escalation beyondthat date. Interest during construction is also excluded. Unitprices for the various civil works items are adapted from thoseused in the Chester Lake estimates where applicable. Costs forelectrical equipment were based on recent data provided by manufacturersand adjusted to January 1982 price levels. As shown onTable 111-5 the estimated cost of the Triangle Lake Project is$22.7 million including a contingency allowance of 20 percent andestimated engineering and owner's overhead costs of $3.0 million.Table 111-5Triangle Lake ProjectCost Estimate1.2.3.4.5.6.7.MobilizationAccess Road and DockReservoir, Dam, Spillway & IntakePenstockPowerhouseMechancial & Electrical EquipmentTransmission LineSubtotalContingency 20% +$ 700,0003,100,0002,850,0005,000,0001,000,0002,500,0001,250,000$16,400,0003,300,000Total Direct CostEngineering & Administration 15%+Total Construction Cost(January 1982 Price Level)Environmental ASpects$19,700,0003,000,000$22,700,000Terrestrial. Raising the lake level would inundate someterrestrial habitat, but the amount of habitat flooded would notbe significant since the slopes abutting Triangle Lake are quitesteep.There is an existing logging road leading from near the outletof Trout Lake to the general vicinity of Triangle Lake whichcould serve as part of the access road and transmission line routebetween Triangle Lake and Metlakatla. Some new roads would be re-111-9

quired in the immediate vicinity of Triangle Lake, and betweenTrout Lake and Metlakatla. Disturbance of some terrestrial habitatwould occur with new road construction.Aquatic. Triangle Lake is known to support a population ofcutthroat trout (Salmo clarki), while the small lake in the upperdrainage to the southwest apparently has no game fish (USFWS1976). The small lake downstream of Triangle Lake is known tosupport both cutthroat trout and Dolly Varden char (Salvelinusmalma). The stream draining Triangle Lake is not catalogued as ananadromous fish stream (ADFG 1968). Fall 1981 field observationsconfirmed the presence of a high waterfall impassable to fishwhere the stream enters tidewater. In addition, intertidal salmonspawning habitat at the mouth of the stream appears to be minimal.Since cutthroat trout usually spawn in small streams ingravel substrate (Scott and Crossman 1973)11, raising the lakelevel would probably inundate spawning habitat in the lake's tributarystreams. The potential magnitude of this impact cannot beascertained at present, since there are no data on the lake'scutthroat population.Since Dolly Varden and cutthroat trout occur in the smalllake in the lower drainage below Triangle Lake (USFWS 1976), boththese species are almost certainly present in the stream in thelower part of the drainage as well. With a hydropower project atTriangle Lake, adequate minimum releases from the lake would probablybe necessary to ensure maintenance of the downstream fisheryresources.While it is not a part of the development plan presented,consideration was given to constructing an overflow spillway onthe eastern arm of the lake which would discharge into CascadeCreek, the next drainage basin to the east. If such a spillwaywere to be included as part of this alternative, effects of spillon the Cascade Creek flow regime would have to be examined, sincethis stream is an AOFG-catalogued anadromous fish stream (ADFG1968). Cascade Creek supports spawning runs of both pink and chumsalmon, with a maximum annual pink salmon escapement of about2,000 fish estimated during the period 1972-1976 (USFWS 1976).Care would have to be exercised in routing and placement ofnew accss road and transmission line to avoid adverse effects onaquatic habitat. Use of existing roads for project access andtransmission line routing would be preferable wherever possible.Scott, W.B., and E.J. Crossman. 1973. Freshwater fishes ofCanada Fisheries Research Board of Canada Bulletin 184,Ottawa, 966 pp.III-IO

Probably the most sensiti~~ area along the potential transmissionline route is where the line would cross the streams draining theTrout Lake and Melanson Lake systems, just north of Chester Lake.Both the Trout and Melanson Lake outlets are catalogued anadromousfish streams (ADFG 1968). The Trout Lake system supports populationsof pink, chum, coho, and sockeye salmon (Oncorhynchusnerka), cutthroat trout, and Dolly Varden char. The Melanson Lakesystem provides provides spawning habitat for pink and chum salmonin the outlet stream downstream of the 125 foot falls near tidewater,and supports cutthroat and rainbow trout in the upperdrainage (USFWS 1976). Placement of a tranmission line and/oraccess road through this area would have to be carried out carefullyin order to avoid distrubance of the important fish habitatin these streams.Special Biotic Resources. Based on the assumption that theflora and fauna of the Triangle Lake area are essentially identicalto those of the Chester Lake area, development of the TriangleLake alternative would not be expected to have any effect onproposed or listed threatened or endangered species (see AppendixC) •Construction of new access road and transmission line placementin areas near tidewater could impinge upon eagle use areas.The rights-of-way would have to be routed and construction scheduledto avoid any disturbance of eagles during the nesting andbrooding season.The Triangle Lake alternative would not be expected to haveany adverse effect on agricultural land or range land. Providedthe existing logging road is used to the extent possible for projectaccess and transmission line routing, effects on forest landwould be expected to be minimal and not significant. Likewise,effects of the Triangle Lake alternative on wetlands, floodplains,and estuaries would be expected to be minimal.Recreation. Implementation of the Triangle Lake alternativewould lmprove access to the lake area and would probably lead toincreased recreational use, including hunting and fishing.s~cial Features. No known historical, archeological, orcultur~ resources would be affected by development of the TriangleLake alternative. However, in the event this alternative iscarried further, a preconstruction archeological survey should beconducted, with emphasis on those areas near the coastline of theisland which would be affected.Impact on existing scenic/esthetic conditions would resultfrom raising the water level of Triangle Lake, modification of theflow regime of the discharge stream, and placement of the dam,III-II

penstock, powerhouse, access road, and transmission line. In eachcase, impact could be minimized by using proper design and/orrouting criteria.Water Quality and Quantity. There would probably be shorttermincreases in suspended sediment levels in Triangle Lake andits outlet stream during construction. With proper constructionprocedures, no significant adverse impact would result.Terrestrial vegetation which would be inundated by raisingthe Triangle Lake water level should be cleared to avoid any potentialdebris problems at the power intake or spillway. Significantwater quality changes would be expected in Triangle Lake ifclearing were not carried out.WOod waste GenerationThe community-owned sawmill, leased to the Louisana PacificCorporation, processes cants for shipment to Japan and sends chipsto the Ketchikan Pulp Mill in Ketchikan. In 1981, due to therecession in world markets, the mill shut down in September, andprocessed only 32 million board feet (MMBF) of timber and 28,000tons of chips. For 1982, it is expected that the mill will startoperation in June or July.Discussions with representatives of the Louisiana PacificCorporation have indicated that the sawdust associated with theprocessing of timber is presently sent to Ketchikan where it isused for electric generation. Several tests have also been performedto use the bark, but the project was not found technicallyfeasible. As a result, the Louisiana Pacific Corporation has nopresent intention of developing its own wood-waste generatingplant in Metlakatla. In addition, no other Alaska mill makes acommon practice of burning large volumes of pulp chips for fuel.In 1981, the dockside price of a 2400-lb. unit have rangedbetween $43 and $117. Assuming an adjusted price of $64 per 2400-lb. unit, and about five pounds of wood chips to generate 1 kWh,the fuel value would be about 13.3 ~/kWh. This compares to adiesel fuel cost of about 13 ~/kWh for the market area. Inaddition, the investments and maintenance costs of a wood-wastegenerating plant are higher than the costs of a diesel plant. Forthese reasons, a wood-waste alternative was not found economicallyattractive to meet the energy demand of the market area.III-12

Chapter IVTHE CHESTER LAKE ALTERNATIVEGeneral Project DescriptionThe Chester Lake Project would develop the hydroelectricpotential between Chester Lake and Port Chester. The projectwould consist of a new dam and spillway, constructed downstreamof the present water supply dam: a water conductor, consistingof a gated intake and steel surface penstock: a sea level concretepowerhouse, containing a single horizontal Francis typeturbine-generator unit: and a step-up transformer and transmissionline link to the existing transmission system. The projectwould be capable of operation by remote control from the PurpleLake Hydro project. A detailed description is given inChapter VII.Alternative Plans of DevelopmentThree alternative plans of development of the Chester Lakeresource were investigated. The plans are presented in thischapter and the results of economic and financial comparisons ofthe plans are given in subsequent chapters. The three alternativedevelopment plans are:Alternative 1. This alternative is a storage project witha 2.5 MW installed capacity. An 80 foot (maximum height)concrete arch-gravity dam would be constructed downstreamof the existing water supply dam. An ungated spillway withits crest at El. 885, 40 feet above existing lake level,would be located in the center of the dam. The resultingreservoir would have a useable storage capacity of 4180acre feet. The remaining project features conform to thegeneral description previously given.Alternative 2. This alternative is a 2.5 MW run of riverproject. The dam would be a concrete arch-gravity with itsspillway crest and maximum normal pool at El. 845. The damwould be designed to allow a future raise to El. 885. Theremaining project features are the same as those of Alternative1.Alternative 3. This alternative consists of a 1.5 MW runof river proJect at Chester Lake and a 1.0 MW addition tothe existing Purple Lake Project (described in ChapterIII). The new Chester Lake dam would be the same as thatcontemplated for Alternative 2. The penstock, powerhouseIV-l

and equipment would be sized for the 1.5 MWunit.generatingData pertaining to each of the alternatives are shownin Table IV-I.Table IV-lItemAlternative1ChesterLakeAlternative2ChesterLakeAlternative 3Chester PurpleLake LakeInstalledCapacity, MW2.52.51.5 1.0MaximumNormalPool, El.885845845 321UseableStorage,Acre-feet4,180NoneNone 25,000TotalConstructioncost­Million $13.19.18.2 - 2.6Cost estimates were prepared for each of the alternativesconsidered. The estimates are at the January 1982 price leveland include the direct cost of civil works, contractor's overheadand profit, purchase and installation of equipment, contingencies,engineering, and owner's administration. Interestduring construction and price escalation beyond January 1982 arenot included. The estimated cost of each project is shown indetail on Exhibits 12 through 14.The difficult access for construction of the Chester LakeProject is reflected in the cost items No. 2 and No.6 on Exhibits12, 13, and 14. For Alternative 1, with reservoir atEl. 885, access for construction of the dam and a portion of thepenstock will be provided by a cableway from sea level, near thepowerhouse site, to El. 840 at the dam site. the estimated costof construction and operation of the cableway is Item No. 2 onExhibit 12. The smaller quantities of materials required forconstruction of the El. 845 dam for Alternatives 2 and 3 makehelicopter access to the dam and penstock area less expensiveIV-2

than cableway access. The estimated cost of transporting materialsand equipment by helicopter for construction of theEl. 845 dam and penstock is shown as Item No.2 on Exhibits 13and 14.Item No. 6 on Exhibits 12, 13 and 14 is the estimated costof access to the powerhouse area both during and after construction.For Alternatives 2 and 3, access to the powerhouse areafor powerhouse construction and equipment installation would berequired for approximately one year. By contrast, access to thepowerhouse area for Alternative 1 would be required during theentire two year construction period. This is necessary because,in addition to powerhouse construction access requirements,materials and equipment for construction of the El. 885 dam andpenstock must also be taken to the powerhouse site for transferto the cableway.Permanent access to the powerhouse for all of the ChesterLake alternatives would be provided by a wooden walkway constructedapproximately parallel to the shore of Port Chesterfrom Walden Point Road. The cost of the walkway is included initem No. 6 on Exhibits 12 through 14.Power and Energy Potential of Alternative ProjectsReservoir and system power operation studies were made todetermine the power and energy that could be produced at thePurple Lake Project, the expanded Purple Lake Project and ateach alternative of the proposed Chester Lake Project. Theenergy utilization from the existing and expanded Purple LakeProject, proposed Chester Lake Project and 3000-kW Quarry DieselPlant by the Metlakatla System were estimated for the planningperiod.The operation studies were performed for the Chester LakeProject with maximum normal reservoir levels at elevation 885,and 845 and with installed capacities of 2,500 kW and 1,500 kW.The expansion of the existing Purple Lake Project with additionof a 1000-kW unit was also studied. The combinations are:Alternative 1Chester Lake.- Maximum normal reservoir level at El. 885and installation of 2,500 kW.Purple Lake -Existing installation of 3,000 kW.IV-3

Alternative 2Chester Lake - Maximum normal reservoir level at El. 845and installation of 2,500 kW.Purple Lake - Existing installation of 3,000 kW.Alternative 3Chester Lake - Maximum normal reservoir level at El. 845and installation of 1,500 kW.StreamflowPurple Lake - Expansion of the existing 3000-kW plantwith addition of a 1000-kW unit.The monthly streamflows at Chester Lake for the period of1942 to 1980 were developed from the 9-year record of monthlyflows from Purple Lake. The development of the estir;.ated monthlystreamflows from Purple Lake is discussed in Chapter III.The Chester Lake average monthly streamflows,'shown in Table IV-2, are Purple Lake flows adjusted for drainage area ratio. Theaverage annual runoff is estimated to be 16,050 acre-feet.Table IV-2AVERAGE MONTHLY STREAMFLOWS AT CHESTER LAKEMonthJanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecemberAverageTotalStreamflow, c fs2 0.821.116.324.423.314.612.113.621.335.232.930.422.216,050 Acre-feetIV-4

Monthly Peak Loads and E:1ergy DemandsThe monthly peak loads and net energy generation for theyears 1978, 1979 and 1980 were used to develop the load andenergy demand patterns. The monthly peak loads expressed interms of percentage of the annual peak load and the monthlyenergy demands in percentage of the annual energy generationrequirement are given in Table IV-3. The monthly loads andenergy demands were used in the reservoir operation studies.The loads and energy demands were also used to develop theannual load duration and peak-percentage curves as shown onExhibit 15. The curves were used for dispatching the PurpleLake and Chester Lake hydroelectric plants and the Quarry DieselPlant. The dispatching of the plants in the Metlakatla Systemis discussed later in this report.MonthJanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecemberTable IV-3MONTHLY PEAK LOADS ANDENERGY DEMANDSPeak Load InPercent ofAnnual Peak91.884.184.580.577.170.375.879.371.078.483.3100.0Reservoir Operation and Power StudiesEnergy Demand InPercent ofAnnual Generation9.719.378.657.748.327.197.757.677.137.309.269.91100.00The operation of the Purple Lake and the proposed ChesterLake Projects were simulated to determine the potential powerand energy production of the Purple Lake and Chester LakeHydroelectric powerplants. The operation was conducted on amonthly basis using the simulated streamflow data. The basicassumptions and required input data are as follows:Basic Assumptions.operatlon studies were:The basic assumptions used for theIV-5

1. The reservoir is ":ull at the start of the operationstudies.2. The maximum normal reservoir water surface is theelevation of the top of the spillway crest.3. The assumed annual energy generation requirements weredistributed to each month on the basis of the forecastdemand pattern.Input Data.1. Area-capacity curve.2. Tailwater elevation.The input data included:3. Monthly streamflows for the period of 1942-1980.4. Turbine performance curve.5. Maximum and minimum reservoir operating levels.6. Monthly non-power release requirement, 1 cfs fromChester Lake for water supply to Metlakatla.7. Monthly energy demand pattern.Results of the Reservoir Operation StudiesThe average and firm energies for alternative schemes ofthe Chester Lake development and Purple Lake expansion aresummarized in Table IV-4.,IV-6

Table IV-4AVERAGE AND FIRM ENERGY POTENTIAL OFTHE CHESTER LAKE AND PURPLE LAKE POWERPLANTSAl t.No.Chester LakeProjectAverage AnnualEnergyMillion kWhFirm AnnualEnergyMillion kWh1El. 885,Capacity2,500 kW10.37.92El. 845,Capacity2,500 kW9.86.63El. 845,Capacity1,500 kW8.66.3Al t.No.Purple LakeProject1,2ExistingInstallation3,000 kW15.813.83WithExpansion4,000 kW16.113.8The lowest annual energy potential computed in the operationstudies of the Purple Lake and Chester Lake Projects using39 years of simulated monthly streamflows (1942-80) were used asthe firm energy production of the projects.Energy Utilization of the SystemUpon completion of determining the potential energy production,the energy generation from the existing and expandedPurple Lake and proposed Chester Lake Hydroelectric Projects andQuarry Diesel Plant were fitted under the annual load durationcurve.The energy generation from the existing Purple Lake Projectwas combined with the proposed Chester Lake Project to maximizethe hydro generation under the load duration curve. When theIV-7

total dependable capacity of the hydroelectric plants was lessthan the peak load demand, the Quarry Diesel Plant was placed onpeak to meet the load. The monthly diesel energy generation wasdetermined by subtracting the amount of hydro energy utilizedfrom the forecast energy requirements of the Metlakatla System,or peaking energy production corresponding to the dispatchedcapacity of the Quarry Diesel Plant under the load durationcurve.The procedure was carried out for each month for the threeselected wet, average and critical years. Two load years, 1985and 2000, were used to evaluate the effect of the load growth onthe energy utilization from the hydroelectric plants in thesystem. The average annual energy utilization from the PurpleLake and Chester Lake Projects and the Quarry Diesel Plant wereestimated on the basis of the results of the load dispatch studyfor the three selected years and frequency distribution of theannual energy generation using the 39 years of the simulatedmonthly streamflows. The average annual energy utilization fromthe hydroelectric and diesel plants for load years 1985 and 2000with the Chester Lake maximum normal reservoir level at elevation845 and installation of 2500 kW are given in Table IV-5.IV-8

Table IV-5ENERGY UTILIZATION OF THEHYDROELECTRIC AND DIESEL PLANTSLoad Purple ChesterAlternative Year Demandll Lake Lake DieselGWh GWh GWh GWhBase CaseY 1985 22.01 15.0 7.012000 26.88 15.0 11.88Alternative 1Chester L. E1. 885 1985 22.01 15.0 7.0 0.01Inst. Cap. 2.5 MW 2000 26.88 15.0 9.6 2.28Al ternative 2Chester L. E1. 845 1985 22.01 15.0 6.4 0.61Inst. Cap. 2.5 MW 2000 26.88 15.0 8.3 3.58Al ternative 3Chester L. E1. 845 1985 22.01 15.3 6.3 0.41Inst. Cap. 1.5 MW 2000 26.88 15.3 8.0 3.58II Most likely scenario~I Base Case, no Chester Lake ProjectIV-9

Chapter VECONOMIC EVALUATIONIntroductionA description of three alternative plans of development ofthe Chester Lake resource are presented in the previous chapter.In this chapter an economic comparison of the three alternativesis presented and, based on that comparison, one of the alternativeis selected for further analysis.In Chapter III, a description is presented of other alternativesources of power available on Annette Island. From thesealternatives, and the selected Chester Lake alternative, threeexpansion plans were developed according to the guidelines of theAlaska Power Authority (APA). An economic comparison of the threeexpansion plans is presented in this chapter.The "Base Case" expansion plan would meet the forecastedrequirements of the area by a continuation of present practices ofdiesel generation to supplement the Purple Lake Project. The"Preferred Plan" would consist of the addition of the Chester LakeHydro Project to the present system. The "Second Most PreferredPlan" would consist of the addition of the Triangle Lake HydroProject instead of Chester Lake.An investigation of alternative heating technologies wasconducted and an economic comparison of the various heating modeswas prepared. The results of those studies are presented in thefinal section of this chapter.Criteria for Economic ComparisonsThe Alaska Power Authority (APA) has established the followingstandard parameters for the economic evaluation. A discountrate of 3 percent is used to calculate the present worth of costsoccuring in different years on an equivalent basis. The cost ofdiesel oil is assumed to escalate at a rate of 2.6 percent for thenext twenty years and is then constant. The escalation rate fornon-fuel cost items is assumed to be zero. The economic life isassumed to be 50 years for hydropower plants and 20 years for thediesel units.The economic analysis is for the period starting in 1982 andending in 2034, the last year of the 50-year economic life of theChester Lake Project. The analysis assumes replacement of theexisting generating facilities at the end of each facility's economiclife: 1991 for the two 1.5 MW diesel units and 2011 for theV-I

three 1.0 MW hydropower units at Purple Lake. New generatingfacilities would be added in the year that the peak demand wouldotherwise exceed the system's firm capacity, excluding the largestgenerating unit. However, it was assumed that in case of an outageof a generating unit power deliveries to the sawmill can bereduced by 1000 kW, because the sawmill has in reserve, for emergencyuse, four standby diesel units which have total capacity of2,450 kW.Separate economic analyses were prepared for the threedifferent electric load forecasts for each of the alternativeplans. The energy required was assumed to be supplied by theplants in the following sequence:1. Purple Lake2. Chester Lake (or Triangle Lake)3. Diesel UnitsThe energy generated by the hydro plants was obtained fromthe results of the reservoir operation studies previouslydescribed. Deficiencies between the demand and the supply fromthe hydro plants will be up by the diesel plant. When totalinstalled capacity at the hydro plants is less than peak demand,peaking energy will be provided by the diesel plant. Energyvalues listed in Table IV-S were used in the economic analyses.Fixed costs of hydro projects, i.e., construction costs,engineering, owner's overhead, interest during construction andamortization expenses at 3 percent interest were spread over a50 year amortization period. For diesel plants, a 20 year amorizationperiod was used.Annual operation and maintenance costs for the Chester Lakeproject were based on remote control operation. Annual operationand maintenance costs for the diesel plant were estimated at $0.03per kWh generated. No escalation was applied to these annualcosts.Cost of the diesel fuel was estimated at $0.09 per kWh ofenergy generated at the plant based on an average generation of12 kWh per gallon. An annual differentia1 escalation rate of 2.6percent was applied to the cost of diesel fuel until year 2001.No increase in fuel cost was assumed to occur thereafter.The annual totals of the future costs were discounted at3 percent rate to present worth year 1982.Economic Comparison of Chester Lake AlternativesUsing the established criteria, an economic comparison wasperformed to determine the best alternative development of ChesterV-2

Lake. The results of the study are presented in Table V 1 and onExhibit 16 pages 1 through 9. As shown in the table, Alternative1, the storage project, with reservoir El. 885 and 2.5 MWinstalled capacity has the least present worth cost for the mostlikely and high scenarios of load growth. For the low load forecast,Alternative 2, the 2.5 MW run of river project has the leastpresent worth. Based on these results, the 2.5 MW storage projectwith reservoir El. 885 is the selected project for further comparisonwith other alternative power sources on Annette Island.Table V-IECONOMIC COMPARISON OF ALTERNATIVE PLANS OFDEVELOPMENT AT CHESTER LAKELoadForecastPlanNo.ChesterReservoirElevationftLakeInstalledCapacityMWCumulativePresent Worthin $ MillionllMostLikely1238858458452.52.51.5Y30.9531.3332.95Low1238858458452.52.51.5Y24.2521.1522.14High1238858458452.52.51.5Y44.4245.5347.1517 Present worth of Chester Lake, Purple Lake and Diesel Plants.~/ Installed capacity at Purple Lake increased to 4 MW.GeneralEconomic Comparison of Alternative System Expansion PlansAs noted in Chapter II, the existing Metlakatla Power andLight generating facilities consist of the three-unit, 3.0 MWPurple Lake Hydroelectric Project and two 1.5 MW diesel generators:a total of system installed capacity of 6.0 MW. Based onthe largest-unit-out criterion, the system firm capacity ispresently 4.5 MW. In developing the various expansion plans it isassumed that at the outage of the largest unit, peaking power fromthe Metlakatla system to the sawmill will be reduced by 1000 kWbecause the sawmill has in reserve, for emergency use, fourV-3

standby diesel units which total 2,450 kW. In the evaluation ofthe various alternative expansion plans, the existing facilitiesare common components of each plan. In accordance with theeconomic criteria under which the economic evaluation isperformed, the generating facilities at Purple Lake are assumed torequire replacement or major overhaul at the end of 50 yearsservice, or in the year 2011. The cost of such replacement isestimated to be about $3.0 million. Similarly the existing andfuture diesel units would be replaced after about 20 years ofservice. The replacement of the existing diesel units is assumedto occur in 1991.The fixed costs of the existing facilities,economic analysis, are based on historical data.cost of the Purple Lake Project is $85,000. Fordiesel unit the annual fixed cost is $30,000.Base Case Planused in theThe annual fixedeach 1.5 MWThe Base Case is a continuation of present practices, usingthe Purple Lake Project for base-load generation and diesel unitsfor production of peaking power. New diesel units will have aservice life of 20 years, and will be added when necessary tomaintain a reserve margin equal to the capacity of the largestgenerating unit in the system less 1000 kW power delivery to thesawmill. Each new diesel unit can be installed within a fewmonths before its capacity is required.Table V-2 shows the Base Case system expansion scheduleeach of the electric load forecasts developed in Chapter II.table gives the unit size, type, and on-line year for eachrequired replacement or addition to the system.forTheBased on recent quotations received for similar units andincluding the cost of transportation, erection, contingencies andengineering, the cost of diesel units, installed in the projectarea, is estimated to be about $750 per kilowatt, at January 1982price level. Based on average plant energy generation of about12 kWh per gallon of diesel fuel, the fuel cost is equal to $0.09per kilowatt-hour for 1982. The operation and maintenance costsare estimated at $0.03 per kilowatt-hour.Preferred PlanThe Preferred Plan would consist of the construction of theChester Lake 2.5 MW storage project followed by additional dieselunits, when required. The existing diesel units would serve asstandby units. The Chester Lake Project is expected to startoperating January 1985.V-4

Table V-3 gives the Preferred Plan system expansion schedulesrequired to meet the low, high and most likely electric loadforecasts.The detailed construction costs of the Chester Lake Projectare presented in Exhibit 12. The total cost is estimated at$13,140,000. The annual operation and maintenance cost for theproject is estimated to be $65,000. The installed capacity atChester Lake is 2,500 kW. The maximum annual energy utilized bythe system is 9,600 KWh.Second Most Preferred PlanThe Second Most Preferred Plan would consist of the constructionof the Triangle Lake Project, followed by additional dieselunits, if required. The Triangle Lake Project would start operationin 1986. The construction and annual operation and maintenancecosts of the Triangle Lake Project are estimated to be$22,700,000 and $130,000 respectively. A higher operation andmaintenance cost is estimated for Triangle Lake than for ChesterLake because Triangle Lake is much more remote and has a muchlonger transmission line. The installed capacity is 3,000 kW, andthe average annual energy is 11,000 MWh.System expansion schedules for the Second Most Preferred Planfor each of the three electric load growth scenarios are shown onTable V-4.Economic ComparisonUsing the established criteria, an economic comparison wasperformed to determine the most favorable plan of system expansion.The present worth cost of the Base Case, Preferred Plan andSecond Most Preferred Plan were computed for each of the loadgrowth forecasts. Pages 1 through 9 of Exhibit 17 show the economicanalysis and present worth computations for each of thethree expanison plans and for each of the three electric loadforecasts.The present worths (- costs) of the alternative plans,expressed in $ million, are as follows:V-5

Table V-5Most Likely ww HighPlan of Load Load LoadDevelo~ent Forecast Forecast ForecastBase Case 54.34 35.74 66.19Preferred Plan 30.95 24.25 44.42Second Preferred Plan 37.18 33.45 49.95As shown above, the Preferred Plan will have the lowest costfor meeting the energy and capacity requirements of any of theload forecasts.Analysis of Alternative Residential Heating TechnologiesTo evaluate the impact of the addition of the Chester LakeProject on the existing residential heating mode split, and tojudge the assumptions made in the load forecasts, economic andfinancial analyses of alternate methods of meeting heatingrequirements were performed. For the purpose of the economicanalysis, the Chester Lake Alternative 2 (Run-of-River and 2.5 MW)was chosen to derive the electricity production cost in 1985 andthereafter under the most likely scenario of energy demand. Toreflect the existing differences between residential electricrates and commercial/industrial rates, the "residential"production cost is expected to be 75 percent of the average cost.Although there would be a major cost increase in 1991 due toreplacement of the existing diesel units, this increase is notincorporated in our analysis because it would affect mostly thecommercial/industrial customers.A description of the predominant residential heating modes inuse on Annette Island and the economic analysis thereof are presentedin the following paragraphs. The financial analysis ofresidential heating is presented in Chapter VI.Alternative Space ~ Water HeatingOn Annette Island, space and water heating are now mostlyprovided by electric resistance. In addition, nearly all thehouses are using wood stoves for supplemental space heating. Theestimated average annual heating requirement for a residentialunit with 950 square feet of living area was about 64 million Btufor space heating, and 17 million Btu for water heating. In 1981,electric energy provided about 58 percent of the total demand,wood 32 percent, and fuel oil 10 percent.V-6

Investment and maintenance costs of four alternative methodsof meeting heating requirements were derived from a study sponsoredby the Alaska Power Administration for Juneau. These costsare presented in Table V-6. The annual investment costs are basedon a 10% discount rate and a 10-year economic life. For the woodalternative, two investment and maintenance costs are presented,corresponding to the installation of a wood stove or of a completewood-heating system. For the heat pump alternative, a coefficientof operating performance of 2.2 is used.Although the wood alternative has the least total cost, itsinconvenience and time-consuming operation has made it only asupplemental energy source. In addition, if there is a greaterdemand for wood, the price is expected to increase faster thaninflation because the supply of wood from the nearby beaches islimited. The logs would then have to come from the forests whichare farther from the community and not as accessible as thebeaches. For comparison, the costs of wood heating with $70, $90and $120 per cord are presented in Table V-6. At $120 per cord,an "all wood" alternative is more expensive than an "all electric"alternative.Based on the current residential price of SO.OS/kWh, theelectric resistance alternative is slightly less expensive thanthe heat pump alternative. With higher electricty prices, a heatpump becomes more attractive. But, because the existing housesalready have electric space heaters, and because the investmentcost of a heat pump is very high, it is expected that thepotential market for heat pumps would be limited to the new unitsunder construction. However, the HUD units under construction orplanned by the Housing Authority of Metlakatla will be equippedwith wood stoves and electric resistance heating. As a result, areduction in electric consumption due to the installation of heatpumps is not expected in the short and mid term.The fuel oil alternative is the most expensive. With a totalannual cost of $1880, it is about 13% higher than an all electricalternative, and 36% higher than an all wood alternative.Economic Analysis. Projections of the average residentialheating energy cost were performed to evaluate the impact of theChester Lake addition on the residential electric consumption. Aneconomic analysis was performed based on APA parameters (0%inflation and 2.6% fuel escalation rate). The results aresummarized in Table V-7 and presented graphically on Exhibit 18.The cost of electricity was derived from the production cost andthe distribution cost. Based on 1981 data, the "residential"net production cost was about SO.02/kWh. When the Chester Lakepowerp1ant starts operating in 1985, there will be an increase inthe production costs. The production costs are then derived fromV-7

Exhibit 16, Page 2 of 9 corresponding to the Chester LakeAlternative 2. The residential distribution costs averaged aboutSO.03/kWh in 1981. The distribution costs were kept constant forthe economic analysis.Table V-7AVERAGE ANNUAL RESIDENTIAL HEATING ENERGY COSTEconomic Ana1;LSis 1981 1985 1990 1995Electrical Resistance:(23,700 kWh) $1,185 $1,430 $1,400 $1,400Fuel Oil: (980 gallons) $1,130 $1,250 $1,420 $1,620Wood:( 9 cords)S 70 per cord $ 630 $ 630 $ 630 $ 630$120 per cord $1,080 $1,080 $1,080 $1,080V-8

Table V-6Annual Total AnnualY Annual TotalEnergy!! Energy Energy Invest- Invest- Mainten- AnnualRe9uired Cost Cost ment Cost ment Cost ance Cost CostElectricResistance 23,700 kWh $0.05/kWh 1,185 2,750 450 25 1,660Fuel Oil 980 gal $1.15 gal 1,130 4,000 650 100 1,880Wood 9 cords $ 70/cord 630 800/4,000 130/650 20/100 780/1,380$ 90/cord 810 960/1,560$120/cord 1,080 1,230/1,830Heat Pump 10, 800 kWh $0.05/kWh 540 6,570 1,070 100 1,710(COP=2.2)!/ Based on an annual heating requirement of 81 x 106 Btu for an average residential housingunit.~/ Based on 10% discount rate and 10-year economic life.

Chapter VIFINANCIAL ANALYSIS-COST OF ENERGYFinancial PlansFour alternative plans of financing the Chester LakeProject were used to estimate the future production costs of thetotal Metlakatla Power and Light system and of the Chester LakeProject alone. These plans of financing represent some, but notnecessarily all, of the various alternatives available tofinance the Chester Lake Project, and were used to derive thecost of electric energy under the most likely and low scenariosof energy demand and the average annual hydro generation. Thefour alternative plans are as follows:Financin1 Alternative IThe tota cost is flnanced by 12% revenue bonds for a 35-year term.Financing Alternative IIA 5% state loan for a ~-yearterm.Financing Alternative IIIA state grant with a 5~ate of return which includes theO&M costs. No interest during construction.Financing Alternative IVA combination of REA sponsored financing consisting of a 5%loan for $5.48 million and a 13% loan for the balance ofthe total required funds.The diesel fixed annual costs for new additions or replacementsare based on APA parameters: 10% discount rate and a 20-yearlife. In addition, insurance costs are added to the annualfixed costs. For Chester Lake, the annual insurance cost isequal to 0.1% of the investment costs. For Diesel units, it isequal to 0.25% of the investment costs.Criteria for Financial AnalysisThe cost of energy analysis is based on the following parameters:ooa 7% general inflation rate~a 2.6% fuel escalation rate above the general inflationrate for the period 1982-200l~VI-l

o a fuel energy cost of $0.09/kWh at January 1, 1982price level; ando a diesel investment cost of $750/kW at January 1, 1982price level.Cost of EnergyThe results of the cost of energy (financial) analysis areshown in graphical form, on Exhibits 19 through 22. Each page(1 through 4) shows the cost of energy over the twenty yearstudy period for a different financing plan. Each exhibit presentsthe results for a different combination of load forecastscenario (low or mostly likely) and energy source (Chester Lakeonly or total system generation), as follows:Exhibit 19 -Exhibit 20 -Exhibit 21 -Exhibit 22 -Most Likely/Total SystemLow/Total SystemMost Likely/Chester Lake OnlyLow/Chester Lake OnlyAppended Exhibits B-19 through B-22 present correspondingcomputational backup to the graphical presentation. Page 1 ofeach exhibit in Appendix B is the computation of energy costsfor the Base Case. Pages 2 through 13 of the Appendix B exhibitsshow the cost of energy calculations for the various systemexpansion plans and for each financing alternative.Sensitivity Analysis of ResidentialHeating Cost ~ Load GrowthA description of residential heating modes used on AnnetteIsland and an economic comparison of the various alternativesare given in Chapter V. This section presents the cost of energyanalysis of the heating alternatives and a discussion of thesensitivity of load growth to the cost of energy.Analysis of Residential Heating,CostsAppended exhibits B-19 and B-20 show the expected totalproduction cost of energy from the Metlakatla Power and LightSystem for various alternative system expansion plans, financingalternatives, and load growth scenarios for the period 1982through 2005. Data from sheets 6, 7, 8 and 9 of the exhibits,pertaining to the Chester Lake 2.5 MW run of river project, wasused to develop the projected cost of electric resistivity heatingfor comparison to other residential heating alternatives.To reflect the existing differences between residential andcommercial/industrial rates, the "residential" production costis expected to be 75 percent of the average cost. AlthoughVI-2

there would be a major increase in 1991 due to the replacementof the existing diesel units, this increase is not incoporatedin this analysis because it would affect mostly the commerical/­industrial customers. Estimated total annual residential electricheating costs were computed for the period 1985 through1995 based on annual consumption of 23700 kWh per customer.Metlakatla Power and Light's residential distribution costsaveraged about $0.03/kWh in 1981. These distribution costs arebased on salaries, administrative costs, and other distributioncosts which are relatively constant. To reflect that composition,the distribution cost was increased by an annual rate of 5percent over the period 1981-1995 for this analysis.For the most likely load forecast, the net production cost(distribution costs excluded) is expected to increase from$0.02/kWh to an average of $0.076/kWh for the period of 1985-1995 under the 12% Revenue Bonds alternative, $0.048/kWh with a5% loan, $0.039/kWh with 5% rate of return financing, and$0.063/kWh with combined rate funds.Exhibit 20 shows that under the low load forecast, theexpected production costs for the period 1985-1995 are$0.083/kWh with 12% financing, $0.05l/kWh with a 5% loan,$0.04l/kWh 5% rate of return financing, and $0.067/kWh withcombined rate funding.Table VI-l an VI-2 show the results of the financial analysisof residential heating under the most likely load growthscenario and under the low load growth scenario respectively.The results are shown in graphical form on Exhibits 23 and 24,respectively.Load Growth Sensitivity to Energy CostThe cost ratio of all residential electric heating to allresidential wood heating is also presented in Tables VI-l andVI-2. Based on the earlier description of the 1981 heating modesplit, there would be financial incentives to use more wood, inorder to keep the same "heating budget", when the cost ratioincreases from its 1981 level. Under the most likely scenario,and based on $70 per cord, this would happen under a 12% RevenueBonds financing alternative and also under a combined rate loan.With a 5% loan, the cost ratio is only higher for the years1985-1989. Then, as the ratio decreases from its 1981 level,there would be no financial incentives to shift from electricityto wood. With 5% rate of return funding the cost ratio ishigher for 1985 and then decreases. If the cost of woodincrease to $120 per cord (1981 price level), the ratio of electricto wood heating decreases in all cases. As a result, noVI-3

Table VI-lAVERAGE ANNUAL RESIDENTIAL HEATING ENERGY COSTMOSTLY LIKELY LOAD GROWTH1981198519901995Electric Resistence:(23,700 kWh)12% Revenue Bonds5% Loan5% Rate of Return5%/13% Combined Rate$1,185$1,185$1,185$1,185$2,660$2,000$1,790$2,360$2,900$2,240$2,030$2,600$3,210$2,550$2,330$2,900Fuel Oil:Wood:(980 gallons)1I(9 cords)lI$ 70 per cord$120 per cord$1,130 $1,620 $2,580 $4,080$ 630 $ 830 $1,160 $1,620$ $1,420 $1,980 $2,780Ratio:Electric Resistance/Wood12% Revenue Bonds and $70 percord1.9 3.22.52.012% Revenue Bonds and $120per cord1.91.51.15% Loan and $70 per cord1.9 2.41.91.65% Loan and $120 per cord1.41.10.95% Rate of Return and $70 percord1.9 2.11.71.45% Rate of Return and $120per cord1.31.00.85%/13% Combined Rate Funding and$70 per cord1.9 2.81.85%/13% Combined Rate Funding and$120 per cord1.71.31.01/ 7% inflation rate + 2.6% fuel escalation rate~/ 7% inflation rate

Table VI-2AVERAGE ANNUAL RESIDENTIAL HEATING ENERGY COSTLOW LOAD GROWTH1981198519901995E1ec tr ic Res istence:(23,700 kWh)12% Revenue Bonds5% Loan5% Rate of Return5%/13% Combined Rate$1,185$1,185$1,185$1,185$ 2,830$2,070$1,840$2,450$3,070$2,310$2,070$2,690$3,370$2,620$2,380$3,000Fuel Oil:(980 ga11ons)1I$1,130 $1,620 $2,580 $4,080Wood:(9 cords)li$ 70 per cord$120 per cord$ 630 $ 830 $1,160 $1,620$ $1,420 $1,980 $2,780Ratio:Electric Resistance/Wood12% Revenue Bonds and $70 percord1.9 3.42.62.112% Revenue Bonds and $120per cord2.01.61.25% Loan and $70 per cord1.9 2.52.01.65% Loan and $120 per cord1.51.20.95% Rate of Return and $70 percord1.91.81.55% Rate of Return and $120per cord1.31.00.95%/13% Combined Rate Funding and$70 per cord1.9 2.92.31.85%/13% Combined Rate Funding and$120 per cord1.71.31.117 7% inflation rate + 2.6 fuel escalation rate1/ 7% inflation rate

major change would be expected in the residential electricconsumption.Under the most likely scenario of load forecast, the averageannual electric consumption per residential customer isprojected to decrease from 18,500 kWh in 1980 to 17,000 kWh in1985, and 16,000 kWh in 2000. This estimated reduction is basedon a continuation of recent trends of greater use of wood toreplace fuel oil and some electric heating consumption, and onconservation and insulation efforts to reduce overall energydemand. Under this scenario, the cost of electricity is alsoexpected to remain as competitive as it is now. This is dependenton favorable financing, such as a 5% loan, for futureelectric generation projects.As mentioned earlier, the average space heating requirementis about 64 million Btu for a typical housing unit with a livingarea of 950 square feet. With about 7050 Heating Degree Daysper year in Annette Island, this energy consumption correspondsto 0.40 Btu/sqft/oF/hour. This demand could be reduced by asmuch as 30 percent with insulation and conservation.Under the low scenario, the annual residential consumptionwas further reduced to 15,000 kWh to reflect higher cost ofelectricity due to the Chester Lake Project, and greater conservationefforts to maintain total residential heating costs at areasonable level. Under this low scenario, a competitiveChester Lake Project with favorable financing was also assumed.If no favorable financing scheme can be obtained, the cost ofelectricity will increase. For example, if 12% Revenue Bondsare used instead of a 5% loan, the cost of electricity fromChester Lake would nearly double. Such an alternative wouldresult in a greater reduction of electric energy consumption inthe short term. However, in the long term, the cost of electricityfrom Chester Lake will increase at a lower rate thaninflation because the annual investment costs, which are themajor annual cost of a hydropower project, do not increase withinflation, while the cost of other energy sources, such as woodand fuel oil, will continue to increase with or faster thaninflation.VI-4

Chapter VIIRECOMMENDED PROJECTProject Location and SettingThe Chester Lake Project is located at latitude 55°07' N, andlongitude 131°33' W, near the community of Metlakatla on AnnetteIsland in Southeast Alaska as shown on Exhibit 25. The projectwill develop the head between Chester Lake and the sea at PortChester. The lake discharges into Waterfall Creek which flowsinto Port Chester about 0.5 mile downstream from the dam site.Annette Island has rolling and rugged mountainous terrainrising to 3591 feet at Tamgas Mountain which is six milessoutheast of Chester Lake. The Chester Lake valley was glacierformed, having steep sides and a broad base.The climate is largely maritime with occasional incursions ofcontinental air masses. The climate is mild and humid with muchprecipitation. Average temperature is 45.5°F with lowest recordedtemperature -4°F and highest 90°F. Precipitation varies withlocation and increases with elevation. At the NOAA Weather Stationabout six miles from the project area, the mean annual precipitationis 112.02 inches.Waterfall Creek is not an anadromous fish stream and no fishare reported in Chester Lake or in Waterfall Creek.Project ArrangementGeneral DescriptionBased on the economic analysis presented in Chapter V, therecommended development of the Chester Lake resource is a 2.5 MWstorage project. A general plan of the project is shown on Exhibit26. A general profile of the project is shown on Exhibit 27.The project will consist of the following principalelements:1. A concrete arch-gravity dam across the outlet of ChesterLake and downstream from the existing dam.2. An uncontrolled spillway in the center of the dam with adesign discharge capacity of 1000 cfs. The normal maximumreservoir level established by the spillway crestwill be El. 885.0VII-l

3. A single port intake and a gated emergency outlet conduit,located on the upstream face of the dam.4. A water conduit, 28 inches in diameter and 2800 feetlong, connecting the intake to the powerhouse. Thewater conductor will be a steel surface penstock,supported on saddles with anchor blocks provided atmajor bends. A valve house, with remote controlemergency closure valve for the penstock, will beprovided.5. A powerhouse containing a Francis type turbine and generator,rated at 2.5 MW, control equipment and electricalswitchgear. The adjacent switchyard will containthe transformer and transmission line pull-off structure.6. The access walkway, about 1800 feet in length, from theend of the existing Walden Point Road at the southwestend of Port Chester to the powerhouse site.7. A transmission line, one half mile in length, connectingthe project with the existing Metlakatla Power and Lighttransmission and distribution system east of Metlakatlaalong Walden Point Road.Project Functional DesignThe project will regulate the outflow of Chester Lake for theproduction of power and energy. The project will have an installedcapacity of 2.5 MW and an average annual energy production of10.3 GWh. ~he firm annual energy production will be 7.9 GWh.The electrical system is at times affected by fluctuatingloads from the sawmill. The Francis turbines are favorable toaccommodate such load changes. The relatively short penstocklength should also allow response to the sudden load peaks. Studyof governor timing, hydraulic transients and unit characteristicsto meet the system load demands will be made in the design phasefor the project. Sufficient WR2 will be provided to obtain asmuch system stability as practical.Geology of Foundations ~ Construction MaterialsThe geologic investigations in this study are described anddiscussed in Appendix A of this report.VII-2

~idrologicAspectsThe average annual and average monthly flows from ChesterLake for energy evaluation were computed by adjusting estimatedPurple Lake flows by drainage area ratio. A discussion of thetechniques used to estimate Purple Lake flows is given in ChapterIII. The average annual flow from Chester Lake is estimated to be22 cfs.Dam and SpillwayDescription of the Project FacilitiesA concrete arch-gravity dam containing an ungated overflowspillway is recommended to be constructed downstream from theexisting water supply dam as shown on Exhibit 28. Sectional viewsof the dam are shown on Exhibit 29.The maximum height of dam will be about 80 feet above deepestexcavation and the entire foundation of the dam will be excavatedto sound rock.Based on reservoir optimization studies performed using amass curve of inflow data, the optimum maximum normal reservoirelevation and spillway crest elevation are at El. 885. The spillwaywill be located in the center portion of the dam and will beuncontrolled, with a width of 25 feet. The spillway will dischargeonto a reinforced concrete apron anchored to the rockfoundation at the toe of the dam. The spillway will have adischarge capacity of 1000 cfs with the reservoir at El. 890 or5 feet above the normal maximum level. If a flood exceeds thespillway design discharge, overflows of the arch gravity dam canbe passed without damage to the dam or its foundation. OVerflowsof the existing water supply dam abutments are a common occurrenceand do not appear to have damaged the dam or its foundation.A grout curtain will be constructed under the dam to reduceseepage through the rock foundation. The grout holes will beangled to intercept as many joints as possible. A drainage curtainwill be provided downstream from the grout curtain.The selection of the recommended type of dam is based on thefollowing considerations:Construction materials available at the site consist of rockfillwhich would have to be quarried. No earth fill material isavailable at site; thus, a dam composed of such material can beeliminated from consideration. A rock-fill dam with aluminum facingwas proposed in the 1977 Definite Project Report. Earthquakeresistance of aluminum facing is not known and its use is notVII-3

ecommended. Costly anchorage, expensive joints to provide watertightnessand difficulty to repair also make aluminum undesireable.Steel plates of corrosion resistant "Cor-ten" or "Mayari R"are considered better than aluminum. Rock-fill dams with steelfacing have been constructed and have performed satisfactorily.However, steel-faced dams require maintenance, which involvesdrawing the reservoir down to expose the plates. Draw down of thelowest portion of the reservoir would not be acceptable at ChesterLake since it also provides water supply for the community. Reinforcedconcrete facing for a rock-fill dam is another choice~however, construction costs estimated for a rockfill dam with anupstream reinforced concrete face compared to a concrete dam showno significant difference. Estimates of cost for both reservoirelevation 885 and 845 rockfill dams were compared with correspondingconcrete dams of the arch-gravity type. Neither height ofrockfill dam would result in a a significant reduction in projectcost compared to the arch-gravity dam.Construction aspects, because of the canyon shape, makeplacement of any dam material difficult. A smaller volume concretedam has an advantage over rock-fill for material placementin the steep canyon sides. The foundation consists of exposedbedrock adequate to support a concrete dam and is described inAppendix A of this report on geology. The intake for the penstock,outlet conduit and water supply pipe are simplest to incorporateinto a concrete dam. Gate operating stems on the upstreamface of a concrete dam will be less costly than along the face ofa rock-fill dam. Gate stems on a concrete dam would also be lessexposed to reservoir ice.The spillway for a rock-fill dam would be a side channelexcavated through the right abutment. The amount of excavationwould be substantial.There is no clear cost advantage of anyone type of dam. Ofthe concrete dam types the buttress dam with relatively largeamount of steel reinforcement would be the most costly. The gravitydam with largest mass of concrete would be slightly moreexpensive than arch or arch-gravity dams. An arch-gravity damwill have favorable structural behavior for resistance to slidingfor the foundation conditions of the site. The horizontal tomoderately dipping joints near the foundation surface may notprovide sufficient resistance to sliding for a gravity dam. Archand arch-gravity dams obtain additional sliding resistance byexerting thrusts into the abutments. Such action overcomes theexpected lack of cohensive strength of the foundation along horizontaljoints. For this reason, an arch dam is preferable to agravity dam. Use of a thin arch dam would however require additionalstudy of the foundation as described in Appendix A. Coolingof concrete during construction would also be required. ItsVII-4

volume would however be-the smallest of any dam type.gravity dam would not require cooling and combines thefeatures of stabilizing reactions and cost; therefore,type of dam recommended.An archfavorableit is theIntakeAs shown on Exhibit 29, an intake with trashrack and a slidegate will be located on the upstream face of the dam. The intakewill be set low enough to permit drawdown of the reservoir toEl. 845 while maintaining adequate submergence of the intake, andensuring no decrease in storage for municipal water supply. Waterfor power production will pass from the intake to the penstock viaa bell-mouth entrance and transition section.A motor operated butterfly valve located in the valve housedownstream of the dam on the left abutment will provide positiveshut off in an emergency or for penstock repair and maintenance ifrequired.About 10 acres of bushes and trees around Chester Lake willbe inundated at the proposed normal reservoir level. These willbe cleared during construction, and it is expected that littletrash will reach the intake. Intake velocities through the trashrackwill be less than 3 feet per second so the intake port can beset close to the bottom of the short approach channel without thedanger of rocks being carried into it. The existing dam will alsoserve to trap sediment and debris. With the deeply submergedintake ice should not be drawn into it.An emergency outlet conduit with a manually operated gatewill also be provided. This conduit will be 42 inches in diameterand will serve as the diversion conduit during construction andcould be used for reservoir evacuation in an emergency.PenstockThe penstock which will convey flow for power generation fromthe reservoir to the powerhouse, will be a 28 inch diameter steelpipe, 2800 feet long, supported on saddles with concrete anchorblocks at major bends. Penstock sections will generally be 40feet in length and will be joined by sleeve type flexible couplings.The most economical diameter is computed to be 28 inches forthe 2,500 kW generating unit. This diameter would have the lowestcombined annual cost and value of energy lost from hydraulic lossesin the penstock.VII-5

The steel penstock will be fabricated from standard pipesteel and will be painted for corrosion protection. The wallthickness of the steel pipeline will vary from 0.19 inches to 0.31inches.PowerhouseThe powerhouse will have a reinforced concrete substructureand superstructure with a precast concrete roof. The interiordimensions of the powerplant will be 47 feet long by 30 feet wideby 22 feet high from generator floor to the roof. A plan andsectional views of the powerhouse are shown on Exhibit 30.Descriptions of the major equipment items are given in thefollowing paragraphs. A one line diagram of the project is shownon Exhibit 31.Turbine. The turbine will be a Francis type rated to produce2700 kilowatts at a net head of 800 feet at 1200 rpm. At therated output and head the turbine will discharge 44 cfs.Generator. The generator will be rated tover the maXlmum rated turbine output at an 0.80out exceeding an 85°C winding temperature rise.phase, 60 Hz, and have a rated terminal voltagecontinuously delipowerfactor with­It will be threeof4,160-V.The generator will be horizontal, directly connected to theturbine. It will be totally-enclosed, self-ventilated, and becomplete with bearings and accessory equipment.The excitation will be high-speed static type, complete witha solid-state voltage regulator. Either a brushless, rotatingexciter or a potential-source, static exciter will be used, dependingon the manufacturer's standard.Main Transformer. The main transformer, will be 3-phase, 2-windi~rated 12.5-4.16 kV. It will be oil-filled, self-cooledtype, and located outdoors adjacent to the powerhouse.Generator Switchgear. The generator switchgear will consistof the followlng major ltems:1. One metal-clad generator circuit breaker of the airmagneticor vacuum type.2. Instrument transformers.3. A 100-kVA, 4,160-480/277-V station service transformersand 480-V distribution switchboard consisting of moldedcasecircuit breakers.VII-6

4. Plant control and protective relays.Connections to the generator switchgear from the generator andmain transformer will be made with cable.Communications Equipment. Voice and control tone equipmentwill be provlded for communlcations between the Chester Lake Powerhouse,the reservoir, and the Purple Lake Powerhouse. The controltone equipment will enable the generator to be remotely controlledfrom the Purple Lake Powerhouse through suitable controlpanels. OVerhead telephone cable will be utilized for communication.Switchyard Equipment. The switchyard equipment consists ofan oil circult breaker, disconnecting switches, and instrumenttransformers.Powerhouse Crane. The powerhouse will be provided with abridge crane of 15 ton capacity to handle the heaviest lift anticipated.The crane, which will be supported by steel beams, willbe used to unload and erect equipment during construction and tofacilitate maintenance.AccessAccess to the damsite at Chester Lake is presently by helicopteror by foot on an existing path and wooden walkway along thewater supply pipeline alignment. Since there will be minimal needfor access to the dam during project operation the current accessoptions are considered adequate. Access for dam and penstockconstruction could be by helicopter, cableway, tramway or by someother method. Since no permanent facility is required, it isnormal practice to allow the construction contractor to select theaccess method best suited to his own resources. For this studyaccess by either cableway or helipcopter was assumed for costestimating purposes.Access to the powerhouse site, on the right bank of WaterfallCreek at Port Chester, is currently by boat. Three alternativesfor permanent access to the site have been investigated. Theseare an access road in a cut, an access road on a fill, or an accesswalkway plus boat or barge access.Access to the powerhouse site by a road in a cut along theshore of Port Chester corresponds roughly to a proposed plan forextension of Walden Point Road which was studied by the Bureau ofIndiana Affairs (BIA). The BIA investigated a route that wouldrise from the existing road to the bench (about El. 200) above thepowerhouse site. The road would have been constructed in a extensivecut through the talus depoists along a portion of PortVII-7

Chester's shore and involved construction of a retaining wallthroughout the 1800 foot length of this section of the road. TheBlA shelved the road extension project because of the road's highestimated cost and resulting uncertain slope stability of thetalus deposits due to the large cut. The BIA now estimates thatsuch an extension of Walden Point Road to Waterfall Creek wouldcost about $1.75 million at 1982 price levels. Based on thisinformation, the BIA routing was eliminated from further consideration.To minimize the potential for slope failures and mass movementsof the talus deposits, a second road access plan wasdeveloped. The road would be constructed entirely by placing arockfill on the existing slope at tide water elevation along theshore of Port Chester. The slope and existing vegetation wouldbe undistrubed by such construction. A bridge would be requriedto cross the mouth of Waterfall Creek. The road would be usedfor access during construction and thereafter. It is estimatedthat this alternative would require 85,000 cu.yd. of fill andwould cost $1,540,000 at January 1982 price levels.Access by boat or barge and walkway was also investigated.The project will be capable of remote operation and will notrequire daily maintenance. Personnel and small tools and suppliescould be brought in to the site over a wooden walkway from WaldenPoint Road. Large supplies could be delivered by barge. Constructionaccess would be by barge, in the absence of a road, anda floating construction platform would be stationed at the powerhousesite during construction. The cost of access during constructionand construction of the permanent facilities is estimatedto be $1,060,000.The boat and walkway access alternative was selected in theinterest of minimizing project costs.TransmissionA single circuit 12.5 kV transmission line will connect theproject with the Metlakatla Power and Light transmission and distributionsystem. The transmission line, beginning at the powerhousesite, will follow the access road to Walden Point Roadand continue along the existing road to its intersection with theMetlakatla Power and Light transmission line from Purple Lake.A single circuit 12.5 kV wood pole line is proposed. Thisline would be constructed in accordance with REA Type 408. Likethe existing transmission line, the new line would have four 2/0ACSR conduits, (three phases and neutral). Three disconnectingswitches, one each for the lines to Metlakatla, Purple Lake andChester Lake, would be provided at the interconnection point.VII-8

ReservoirThe reservoir created by the dam will raise the present normalfull elevation of Chester Lake 40 feet. The normal maximumreservoir will be El. 885. The proposed upper reservoir level wa~derived from comparative mass curve and present worth analysesprepared for alternative normal maximum reservoir levels ofEl. 875, 885 and 897. The present worth analysis was prepared forthe most likely load growth scenario and was based on the combineduse of Purple Lake, Chester Lake and diesel units for energy generationduring the 50 year life of the Chester Lake Project. Theminimum pool elevation for power generation will be El. 845, whichis the elevation of the existing spillway crest. Storage belowthis elevation will be reserved for municipal water supply.Reservoir operation between El. 845 and El. 885 will provide auseable storage of 4180 acre feet for power generation. Exhibit32 gives the reservoir area and volume curves.Municipal Water SupplyMunicipal water supply for Metlakatla is conducted from theexisting dam by a pipeline. The pipeline r~ns through the proposedproject construction area and consequently it will be reroutedduring construction of the new dam.The existing water supply intake and valve will be abandonedin place and the portion of the 8 inch diameter supply line upstreamof the new dam will be removed. A new trashrack, intakeand valve and reconnect ion to the existing pipeline will be installedas a part of the proposed project.Construction CostEstimated Project CostsThe construction cost of the Project is summarized on TableVII-l and a detailed estimate is shown as Exhibit 12. Theconstruction cost includes the direct cost of civil works, contractor'soverhead and profit, purchase and installation of equipment,contingencies, engineering, and owner's administration, butexcludes price escalation beyond January 1, 1982 and interestduring construction.Detailed estimates of quantities were calculated from theproject plans, and unit prices or lump sum costs were estimatedfor each item of work.The items within each project feature are estimated either aspart of a general construction contract or an equipment purchasecontract. The unit costs of labor and locally available construc-VII-9

tion materials were obtained from local sources. Constructionequipment unit costs were developed from lower U.S. hourly ratesadjusted to local conditions. Unit prices for the principal itemsof work are based on a construction plan designed to implementconstruction of the project in accordance with the constructionschedule as shown on Exhibit 33.The direct cost estimated for the permanent equipment includespurchase, delivery and installation. The major equipmentitems include the turbines and governors, generators and exciters,transformers, switchgear, and powerhouse crane. The prices ofmajor equipment items are estimated based on recent experiencewith similar equipment, and on preliminary quotations from manufacturers.Table VII-lCONSTRUCTION COST OF PROJECT(In dollars at January 1982, Price Level)Item1. Mobilization2. Cableway Access to Dam Site3. Dam, Spillway & Intake4. Penstock5. Powerhouse6. Access Road to Powerhouse7~ Mechanical & Electrical Equipment8. Transmission LineSubtotal+ 15% Contingency Allowance On All ItemsExcept No. 7+ 10% Contingency Allowance on Item No. 7EngineeringOwner's Overhead & AdministrationTotal Construction Cost at January,Price Level1982Cost$ 485,0001,624,0002,869,020897,300800,5501,055,0001,972,00070,000$ 9,772,8501,170,150197,0001,300,000700,000$13,140,000To allow for unforeseen construction circumstances, changesin design, and incomplete data or omissions in estimating, a contingencyallowance of 15% is added to the civil works costs. AVII-IO

contingency of 10% is rdded to the cost of major items of generatingequipment.Based on our experience obtained from other hydroelectricprojects and consideration of estimated services needed on thisproject, an allowance of $2,000,000 for engineering and Owner'soverhead expenses has been included. This consists of $1,300,000for engineering and a resident engineer at the site duringconstruction, and $700,000 for Owner's overhead and administrationcosts including providing assistance to the resident engineer.Operation and Maintenance ~The project would be equipped for remote control operationfrom the Purple Lake powerhouse. Routine operation and maintenanceexpenses are estimated at $65,000 per year, including thetransmission line.Previous StudiesEnvironmental AspectsIn the Definite Project Report, Chester Lake HydroelectricProject July, 1977, for the Metlakatla Indian Community (MIC),Appendix C deals with environmental aspects of the Chester LakeProject. A draft Exhibit W - Environmental Report for ChesterLake Hydroelectric Project was also prepared and was submitted tothe Rural Electrification Administration (REA) as MIC's Borrower'sEnvironmental Report in accordance with REA regulations. Thesereports adequately describe the environmental aspects of the proposedproject.Rural Electrification Administration Final Environmental Statementand Findlng of No Signlficant ImpactREA's Final Environmental Statement on the Chester Lake HydroelectricProject is included in this document as Appendix C.After consultation with State of Alaska and federal resource agencies,REA reached a Finding of No Significant Impact for the proposedproject.Permits and Other AuthorizationscOdPs of Engineers Permits. Before the project can be constructe, tEe U.S. Army Corps of Engineers (Corps) authorizationmust be obtained pursuant to Section 10 of the River and HarborAct of 1899, and to Section 404 of the Clean Water Act of 1977.MIC has submitted to the Corps an application dated 23 January1981 for the necessary permits. Any change in powerhouseVII-II

location, tailrace location, location of the outfall line, locationor size of the dam, or quantities or location of powerhouseand access road fill as described in the 23 January 1981 applicationwill require amendment of that application. Changes shouldbe officially communicated to the Corps as soon as possible, inorder to avoid delay in obtaining the necessary permits.1928 Powerhouse as Historic Site. Under Federal regulations36 CF~O, any proposed modiflcatlon of the old powerhouse willrequire a study to determine its eligibility for inclusion on theNational Register of Historic Places, and subsequent consultationwith the Alaska State Historic Preservation Officer. Whether ornot the site was determined eligible for the National Register,such a study could be time-consuming and could delay constructionof the project. No disturbance of the 1928 powerhouse would occurwith construction of the project as shown in this study.Project Design and Construction ScheduleA schedule for design and construction of the Chester LakeProject is shown on Exhibit 33. As shown on the schedule, ifdesign activities are authorized to proceed on March 1, 1982, theproject could ready for commercial operation by January, 1985.The project construction would be carried out by separatesupply and construction contracts. Separate contracts for supplyof mechanical and electrical equipment, civil works constructionand, possibly, access road construction are anticipated. It isexpected that the civil works contractor will install the turbinesand generators under the supervision of the manufacturer's representativefor that equipment. Access road construction could beperformed by a local contractor or included in the project civilworks contract.As shown on Exhibit 33, construction of the project is expectedto take two years. It is assumed that engineering is authorizedto proceed on March 1, 1982 and that the contracts for equipmentsupply and civil works construction are awarded in September,1982 and December, 1982 respectively.VII-12

LIST OF EXHIBITS1. Population2. Employment3. Fuel Consumption4. Energy Balance5. Historical Peak & Energy Demand6. Historical Monthly Energy Generation7. Electrical Energy Sold by M.P.& L.8. Electrical Energy Forecast, Pages 1 through 39. Power Market Forecast10. Purple Lake Expansion, Cost Estimate11. Triangle Lake, Sheets 1 through 712. Chester Lake Alternative 1, Cost Estimate13. Chester Lake Alternative 2, Cost Estimate14. Chester Lake Alternative 3, Cost Estimate15. Load Duration and Peaking Energy16. Economic Analysis, Chester Lake Alternative Plans17. Economic Analysis, System Expansion Plans18. Economic Cost of Heating Energy19. Cost of Energy - purple Lake, Chester Lake, Diesel:Most Likely Load Growth20. Cost of Energy - Purple Lake, Chester Lake, Diesel;Low Load Growth21. Cost of Energy - Chester Lake Alone: Most Likely LoadGrowth-i-

LIST OF EXHIBITS (Cont'd)22. Cost of Energy - Chester Lake Alone; Low Load Growth23. Annual Cost of Heating Energy, Most Likely Load Growth24. Annual Cost of Heating Energy, Low Load Growth25. Chester Lake, General Map26. Chester Lake, General Plan27. Chester Lake, General Profile28. Chester Lake, Dam and Spillway, Plan29. Chester Lake, Dam and Spillway, Elevation and Sections30. Chester Lake, Powerhouse, Plan and Sections31. Chester Lake, One Line Diagram32. Chester Lake, Reservoir Area and Volume Curves33. Chester Lake, Design and Construction Schedule-ii-

Exhibit 1ANNETTE ISLANDPOPULATION IIYearHistorical Data1890 8231900 4651910 6021920 5741930 4661940 6741950 1,1191960 1,1351970 1,8001980 1,100ProjectionsLow Most likely High1985 1,140 1,160 1,2001990 1,200 1,240 1,3002000 1,300 1,400 1,500Sources:U.S. Bureau of Census, Metlakatla Indian Community,and Pacific Rim Planners, Inc.11 Year-round residents

Exhibi t 2ANNETTE ISLANDEMPLOYMENT1977Category Spring Summer Fall Winter 'Average AnnualNo. %Forestry & ForestProducts8787 8272 82 16.0%Fisheries & FishProducts48282 9828 114 22.3Other Manufacturing1.51.5 1.51.5 1.5 0.3Contract Construction1724 710 15 2.9Transportation &Communications5049 5252 51 10.0Trade2629 25.524 15.5 5.0Finance, Insurance &Real Estate4.54.5 4.54.5 4.5 0.9Serv icesIS16.5 1513.5 15.5 3.0Federal Government142148 2119 82.5 16.1State Government4010 4040 33 6.5Local Government73.5101.5 87.584.5 86.5 16.9TOTALS504.5753 434349 511 100.0Source: Pacific Rim Planners, Inc. estimates.Note: Figures may not add due to rounding.

ANNETTE ISLANDFUEL CONSUMPTIONYEAR 1980Exhibit 3DieselFuel OilGasolineWoodElectric GenerationTransportationIndustriesSubtotalGallons250,000];/150,000100,000500,000Res. & Com. HeatinglO,OOOSchools50,000Public Building & Misc. 20,000Subtotal 100,000HydropowerTransportation 60,000Res. & Com. Heating 90,000~1El~ctric Generation 1 , 2 50 , 00 O.!/Total 2,000,000((:, of Total12.57.55.025.01.52.51.0"""""S':O3.04.562.5100.0Sources:Metlakatla Power and Light, Annette Hemlock Mills,Annette Island packing Company, Metlakatla IndianCommunity, Fuel Distributors.II Fuel Oil Equivalent, based on 12 kWh per gallon~I Fuel Oil Equivalent, based on 60 gallons of fuel per tonof wood

EXHIBIT 4REJECTEDENERGYUSEfULENERGY~(UNITS: BILLION BTU'S)ALASKA POWER AUTHORITYMETLAKATLA POWER AND LIGHTCHESTER LAKE HYDROELECTRIC PROJECT1980ENERGY BALANCE__ ~ __ E:N:G:IN:EE:R:IN:G~C:O:MP::A:N~y~:e:~:U~A~R:Y~':"~ __________ ~ __ ~ __________________________ ~ ____ ~ __ ~ ____--______ ~ ________ ~

Exhibit 5ANNETTE ISLANDHISTORICAL PEAK AND ENEHGY DEMANDTotal Energy Generation(MWh)!i1975 1976 197719781979 1980Hydropower Plant 14,912 14,273 13,095Diesel Plant 2,514 1,433 3,472Total 17,426 15,706 16,56712,7142,79815,51212,653 14,9943,227 2,69415,880 17,688Energy Sold (MWh)ResidentialNumber of Customers 303 318 339Per Customer Consumption(kWh) 21,800 19,900 18,500Total Demand (MWh) 6,614 6,337 6,28533219,1006,338332 35016,300 18,5005,410 6,475Public Buildings and Lighting 568 748 886846790 846Small Commercial 1,351 1,423 1,384Large Commercial and Industrialll 5,565 5,089 6,280Total 14,098 13,597 14,8351,3626,01814,564", '1,195 1,4725,213 6,09512,608 14,888Peak Demand (kW) 5,280 4,440 4,4704,0004,600 4,770Load Factor ( , ) 37.7 40.4 42.344.319.4 42.3Source:Metlakatla Power & Light; REA Form 7, REA Form 12e1/ Includes station service.2/ Does not include energy generated by Annette flemlock Mills.In 1980, the sawmill generated about ]00 MWh.

Exhibit 6ANNETTE ISLANDHISTORICAL MONTHLY ENERGY GENERATIONNet Ener~~ Generatedll Peak Load7R3fil Dleae! Total Demand Factor(MWh) ~ (kw) (' )Year 1980January 1,421 352 1,773 4,770 50.0.February 1,246 568 1,814 4,050 64.3March 1,369 270 1,639 4,000 55.1April 1,231 150 1,381 4,380 42.4May 1,147 221 1,368 4,485 41.0June 992 265 1,257 3,570 48.9July 1,081 147 1,228 3,740 44.1August 1,117 77 1,194 3,700 43.4September 1,037 65 1,102 3,640 42.0October 951 26 977 3,860 34.0November 1,549 214 1,763 4,330 56.5December 1,433 208 1,641 .,720 46.7Annual 14,574 2,563 17,137 4,770 41.0Year 1979January 1,245 219 1,469 4,000 49.2February 1,270 228 1,498 4,400 50.7March 1,106 115 1,221 4,000 41.0April 940 169 1,109 3,180 48.4May 1,073 303 1,376 2,920 63.3June 808 289 1,097 2,830 53.8July 889 386 1,275 3,400 50.4August 828 343 1,171 3,400 46.3September 826 262 1,088 2,650 57.0October 936 265 1,201 3,315 48.7November 985 285 1,270 3,900 45.2December 1,274 212 1,486 4,600 43.4Annual 12,180 3,076 15,256 4,600 37.8Year 1978January 1,284 19 1,303 3,500 50.0February 1,087 10 1,097 2,800 58.3March 1,120 72 1,192 3,300 48.5April 962 160 1,122 3,200 48.7May 857 275 1,132 2,900 52.5June 730 274 1,004 3,000 46.5July 807 290 1,097 3,000 49.1August 638 551 1,189 3,500 45.7September 847 268 1,115 1,200 48.4October 947 237 1,184 3,300 48.2November 1,052 254 1,306 2,900 62.5December 1,197 286 1,483 4,000 49.8Annual 11,528 2,696 14,224 4,000 40.6Source: Metlakatla Power and Light: REA Form 12e.II Excludes station service.

Exhibit 7ANNETTE ISLANDENERGY SOLD BY METLAKATLA POWER AND LIGHT(MWh)tPublict LargeResiden- Building Small Commercial1980 tia1 & Li9htin9 Commercial , Industrial TOTALJan. 1,037 98 135 610 1,880Feb. 580 61 137 560 1,338Mar. 585 85 150 580 1,400Apr. 585 92 145 435 1,257May 490 71 123 538 1,222June 322 42 91 627 1,082July 372 42 104 474 992Aug. 423 57 103 -425 1,008Sept. 334 68 112 425 939Oct. 496 73 120 324 1,013Nov. 572 82 135 567 1,356Dec. 679 75 117 530 1,401TOTAL 6,475 846 1,472 6,095 14,8881981Jan 711 102 168 620 1,601Feb. 665 92 155 337 1,249Mar. 561 78 134 401 1,174Apr. 582 88 131 377 1,178May 457 85 118 454 1,114June 419 49 130 535 1,133July 371 38 117 663 1,189Aug. 361 41 124 567 1,193Sept. 410 63 138 406 1,017Source:Metlakatla Power and Light, Billing Books

Exhibit APage 1 of 3ELECTRICAL ENERGY FORECASTMOST LIKELY SCENARIOPEAK AND ENERGY DEMANDAnnualAnnualGrowthGrowth1980 1985 Rate 1990 Rate 2000(iT (T)ResidentialNumber of Customers 350 410 425 455Per Customer Consumption(kWh) 18,500 17,000 16,500 16,000Subtotal 6,475 6,970 7,010 7,280Small Commercial 1,472 1,550 1.0 1,630 1.0 1,800Large Commercial and IndustrialFisheries 1,000 1,300Forest Industries 4,000 5,600Others 1,395 1,470Subtotal 6,395 8,370 2.0 9,240 2.0 11,260Public Buildings and LightingExisting Facil ities 846 846Swimming Pool 1,020Vocational Shop 220Harbor Facilities 100Street Lighting 20Subtotal 846 2,250 2.0 2,480 2.0 3,030Total Energy Demand (MWh) 15,188 19,140 20,360 23,370Total Energy Generation (MWh) 18,000 22,010 23,410 26,880Peak Demand (kW) 4,770 5,580 5,940 6,820

ELECTRICAL ENERGY FORECASTLOW SCENARIOPEAK AND ENERGY DEMANDExhibit 8Page 2 of 3AnnualAnnualGrowthGrowth1980 1985 Rate 1990 Rate 2000(' ) ( %)ResidentialNumber of Customers 350 400 410 430Per Customer Consumption(KWh)18,500 16,000 15,000 15,000Subtotal 6,475 6,400 6,150 6,450Small Commercial 1,472 1,500 1.0 1,580 1.0 1,745Large Commercial and IndustrialFisheries 1,000 1,200Forest Industries 4,000 4,800Others 1,395 1,400Subtotal 6,395 7,400 1.0 7,780 1.0 8,590Public Buildings and LightingExisting Facilities 846 846 "Swimming Pool 850Vocational Shop 175Harbor Facilities 75Street Lighting 14Subtotal 846 1,960 1.0 2,060 1.0 2,275Total Energy Demand (MWh) 15,188 17,260 17,570 19,060Total Energy Generation (MWh) 18,000 19,850 20,210 21,920Peak Demand (KW ) 4,770 5,040 5,130 5,560

ELECTRICAl. ENERGY FORECASTHIGH SCENARIOPEAK AND ENERGY DEMANDExhibit 8Page 3 of 3AnnualAnnualGrowthGrowth1980 1985 Rate 1990 Rate 2000( %) ( %)Re side n t i a 1Number of Customers 350 430 455 505Per Customer Consumption(kWh) 18,500 18,000 18,000 18,000Subtotal 6,475 7,740 8,190 9,090Small Commercial 1,472 1,620 2.0 1,790 2.0 2,190Large Commercial and IndustrialFisheries 1,000 1,400Sawmill 4,000 6,000Others 1,395 1,540Subtotal 6,395 8,940 2.0 9,870 2.0 12,030Public Buildings and LightingExisting Facilities 846 935 "Swimming Pool 32@.35 1,200Vocational Shop 100@.35 310Harbor Facilities 150Street Lighting 25Subtotal 846 2,620 2.0 2,880 2.0 3,510Total Energy Demand (MWh) 15,188 20,920 22,730 26,820Total Energy Generation (MWh) 18,00' 24,060 26,140 30,840Peak Demand (kW) 4,770 6,100 6,630 7,820

35,00010,000EXHIBIT 930,0008,000~oX&.ICZ• ~wC>-" a:wZw~•:JZZc(25,00020,00015,00010,000DIESELCHESTER LAKECz• ~wC~• WIlL~•:JZZc(',0004,0002,000DIESELCHESTER LAKEPURPLE LAKE"5,000PURPLE LAKE011101_ 1110 1115 2000YEARPEAK LOAD PROJEeTIONSO~------~------r------'------~1980 ll1fi 1110YEAR1995 2000ENERGY DEMAND PROJECTIONSALASKA POWER AUTHORITYMETLAKATlA POWE R AND LIGHTCHESTER LAKE HYDROelECTRIC PROJECTPOWER MARKET FORECAST

PreliminaryESTIMATEHARZA ENGINEERING CO~IPA.NYCBIC..,GO. ILLINOISPURPLE LAKE EXPANSION t·1arch, 1982 3Profec, ______________ Date ________ Pa;e ___ of ___ Pa;es....ITIM QI ill, Unit Prb .....s,ructvre __ S_u_mm_a_r~y_-_l_O.....;;O...:..O.....;.;..kW _________ E.tima'ed by~GJ.;...K",,""-___ Checkeci by ____No.1 IMohi1 i7ation ~ .J2..5. ~? IW.:\tl:ll'" ronnlJ,.tnl'" 111 ... 1 ?n< I Dnwt:ll'" nOll C;P-

PreliminaryESTIMATEHARZA ENGINEERING CO~[PANYCB.ICAGO. ILLINOISExhibit 10"otect__P_ur_p_1_e_L_a_k_e _E_x_pa_n_s_i o_n ____ OOte __ M_a r_c_h_1 9_8_2 ___ Pov e 2 of_...:..3 __ Poges1000 kW GJKStructure...._____ ~ __________ Esti"'ateci by _____ Cltecked by ___ITIM Q .1, u ....... ,.....No.1. r~obilization... t 125 ~OO~2. Water Conductor - -2.1 Penstock - 3~'' 0 ~ JtnM 11l~ 4.70 17 Inoo2.2 Excavation COlTl'l1on AD ~ 12 sn l!:inn2.3 Excavation Rock Trench lir..v 2£;n nn R 17 c;n2.4 Excavation Concr~te 700 Ft 3 " nn.1 bnn12.5 Concret~ Structural 10 cv ?lM nn ?1 l(1nn12.6 Trench Bac!cf; 1 1 ~r;tvel I\n cv 114 nn R InAO12.7 Ruttprflv Valve 3~'' Q! 1 p;tC' h 22 InonI? ~ C'nnnpr1'inn to Trifllr~tiQn L. S. 11\ hnn12 q Valve Ac:r:~~c; M;tnhnlp 1 ead1 2 17 0012 10 Fr;tmp ~ rnvPI" 700 1 bs lqn 1 t11nSubtotal IteTI 2 t h.1 ? ?n~.O Powerhouse- -~. 1 Excava tion, Common~ i.JJ l?Cin 1 h ?s~.2 Excavation, Rock 130 cy 250.00 32 ~OO~.3 Concrete, Substructure 130 cy 1040.00 135 ~OOS.4 Masonry, Concrete Block 410 SF 19.00 7 7903.5 Structural Steel - -a. 5. 1 Columns, Beams, Crane Rail 7000 1 bs 2.30 16 1003.5. ~ Roof Truss· 5000 1 bs 2.30 11 500~.6 Corruga ted Meta 1 Bui 1 ding - -a. 6.1 Remove Existing Wall,~720 SF 19. 00 ' 1 680a. 6. ~ New Wall s 1450 SF ") - - --9.6. ~ New Roof l2!lO ~ 1 30 600,.7 Architectural Treatment 1..5. 20 000a .8 HVAC I S 27 1000~.9 Miscellaneous Metals 7 OOCSubtotal I teTI 3S1301 137GII

t-'re 11m1 naryESTIMATEBARZA ENGINEERING CO!IPANYCBIC£.GO. ILLINOISExhibit 10"rofKt___P_u_r...;.,p_'_e _L_a_k_e_Ex....;p_a_n_s_i o_n ___ Dot._M_a_r_C_h_l_9_8_2 ___ Pag •.__3 __ of_~3 __ Page!...Structur. ___ l...:.O..:;..OO.;:;.....;.k.;,;.W~ ____________ E.ti"'ated by_---.;G;,;;J"""K'--__ Checked by ____ITIMNo.Q==IIy UnIt ftrtaI ~I4.0 Mechanical & E1 ectrical Equipment - - ~I4.1 Turbine & Governor 7 - -4.2 Generator, Excitation J L. S. 1 000 000/4.3 Accessory Electrical Equipment L. S. 100 000 I4.4 Subs tat; on & Transfonner,L. S. 40 000-1Subtota 1 Item 4 $ 1 140 0005.0 Substation Improvenents L. S. 40 000Subtota 1 $ 1 748 490 I ,ItIIIiI1I ,III!II1=§I

EXHIBIT l'..sheet 1 of 7",. ~x ...... ~."\,-, "",.".:-",.\'"flOWER HOUSE+'"-. ~."ALASKA POWER AUTHORITYMETLAKATLA POwER AND LIGHTCHESTER LAKE HYDROELECTRIC PRCE - -TRIANGLE LAKEDEVELOPMENT PLAN

EXHIBIT 11Sheet 2 of 7• y.. ". .CMCref~ cverf/owspillNtJ}£1 ~70t• y'~... 4 •• ... ..1'-0· I/Jid. CxJncref~membr~ne ern I.I/sfac~ Df nxlfil/ d~ S~cf/(')n Thru S,P///WOJSe_It! 111= /0 1 -0 IIALASKA POWER AUTHORITYMETLAKATLA POWER AND LIGHTCHESTER LAKE HYDROELECTRIC PROJECTTRIANGLE LAKEDAM AND SPILLWAY

EXHIBIT 11Sheet 3 of 1'-..... ,f £/. nI. 752 _--'T'a9sJnKl'.~ . .•• ,41J. '"~:~'II' ", ~." h·-'II~' •• ~ '" HI-::: :,' Air v~l/ftt+ ",. ., tif., . ,-L/mJr

EXHIBIT 11Sheet 4 of 7'= /!t, ~ ;.:5~e/ penski~ ______ ~~~r~_~ __________ ~I'": 51 -0 IIALASKA POWfft AUTHOftlTYMETLAKATLA POWER AND LIGHTCHESTER LAKE HYDROELECTRIC PROJECTTRIANGLE LAKEBURIED STEEL PENSTOCKAND ACCESS ROAD

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c:.A II I U I l.I '-ESTIMATEHARZA ENGINEERING CO)[PANYCBIC ..... GO. ILLINOISProtectCHESTER LAKE - Alternative 1 Oa~ March, 1982,Pa;e ___ of '. Po;esStructure_----'501.1ouw!l!!1~a.:...ry~-._2'''"50~0~k.u..W.l..., ...a.E.......l ........... 8 .... 8 .... S

ESTIMATEHARZA ENGINEERING CO!IPANYCJIIC.&.GO. ILLINOISExhibit 12Chester Lake - Alternative 1 Date ~larch 1982 Pa;._.....:2=--_of 4 PageStructur. __ 2S_0_0_k_W_,_E_1_,_8_8_S _________ Estimated by_R_am_D _'__ Checked by....ITIM Q ., Unit Itrb ~No.~1. Mobilization 1 LS $ 485 0002. Cab1ewav Access to Dam Site 1 LS S 1 624 0003, Dam. Soi11way & Intake - -3. 1 Dam & Reservoir Clearing 10 AC 5055.00 5Jl 15503.2 Diversion & Care of Water 1 LS 15 11.003.3 Dam Excavation Rock 1600 cy'i? 00 a3 12003.4 Dr; 11 inQ 6040 LF 1£_25 ~2 1103.5 Drill inq Setuos 320 each220 00 70 40n1.6 GroutinCl 1400 saks 15 75 5n n s r~3.7 Rockbo1 ts 300 LF?4 50 7 I~ sn3.8 Concrete. Mass 5000 cy 434.00 2 17n In(Y'l~ ~ncrete 5truct.tira 1 200 cy 618.00 123 6003,10 Reinforcina Steel 45000 1 bs 1.43 64 3503 11 roii S1:ellaneou s Metals 6000 1 bs 4.60 27 6ClO.--1 12 Rock Anchors 2100 1 bs 4.10 8 610--.113 Tnt::l"'~ Excavation Rock 200 cy 66.00 13 200- ..,~11 14 Tnbkp f,atp f,IJidpc:." i-Inic:.t 1 LS 20 OOC1 1 c; ()lIt'~t r,::It~ r,lIidpc:. ~ Hoist 1 LS 19 0001 1 h Tnt::lllp Trac:.hrilC"llc:. 1 LS 18 OOC-1 17 CQlru-;!tp W"t~Y" C:llnnlv C:vc:.tPm 1 LS 15 SOC-Subtotal Item 3 $ 2 869 02C4. Penstock - -4. 1 Penstock Steel & Couplings 80000 1 bs 2.75 1495 DOC4.2 Penstock Anchor Blocks 240 cy 745. 00 178180C4.3 Penstock Steel Supports 30000 1 bs 4.60 138 100:4.4 Penstock Rock Anchors 6000 1 bs 4.10 24 160(4.5 Penstock Rock Excavation 350 Cy 82.0J 2~ In:-

EST'MATEHARZA ENGINEERING CO~IPANYCBIC.GO. ILLINOISExhibit 12Chester Lake - Alternative 1 '~arch 1982 3 4Prot-:t _____________ Date ________ Poge ___ of ___ Pog.,Structure __ 25_0_0_k_rJ_,_El_._88_5 _________ Eatimoted by Ram D.KT\~Checked by __ _.... ITIM Q ., Unit ...... ~No.5. Powerhouse - -5.1 Clearing 1050 SY ~]O 1 17855.2 Line Dri11ing/Presp1itting 5000 SF 1;.75 33 17505.3 Excavation Rock < 1550 cx -.34.80 51 19405.4 Concrete 665 J:.Y 33J1 00 121 9 14505.5. Fonnwork 9750 SF ~Q.70 1104 13255.6 Reinforcing Steel 133000 1 bs J .43 11

Exhibit 12ESTIMATEBARZA ENGINEERING CO!IPANYCBIC.A.GO. ILLINOISProt-ct ___ C_h_es_t_e_r_L_a _ke_-_A_l-t_e_r_n_a_t_i v_e __ Oat •__M_a_rc..:..,.h_1..;..9.;..82 ___ Pa;. 4 of __ 4 __ PO'i2500 kW, E1. 885 Ram D. KTWStruclur. __________________ Eltimated by _____ Chec:ked by __ _....ITIM Q ...., Unit ".. "-auntNo.7. Mechanical - -I--7.1 Turbine & Governor & Generator 1 LS I$ 1 500 0017.2 Accessory Electrical Equipment 1 LS 240 0017.3 Substation & Transformer~1 LS 110 Oar7.4 Supervisory Controls at Purple Lake &Messenger Cable from PH to Purple Lake 1 LS 62 OOi7.5 Powerhouse Crane 15 Ton 60 001Subtota 1 Item 7 $ 1 972 ~Ol8. Transmlsslon Llne 1 LS $ 70 00II~,:III I!

ESTIMATEHARZA ENGINEERING COMPANYCHICAGO, ILLINOISCHESTER LAKE - Alternative 2 March, 1982 11Project ______________ Date ________ Po;e ___ of ___ Pa;esStructure __ Su_lTITl_a_rY_-_2_S_00_k_W_, _E_l_,_84_S______ E,timGted by_R_a_m _D_'__ Checked by __ K_TW __....ITIM Q......., Unit ..... ,..".,.No.l. Mobilization $ 570 0002. Access to Dam Site 895 0003. Dam, Spillway & Intake 581 0704. Penstock Co055 900"'5. Powerhouse 892 4906. Access to Powerhouse 520 0007. Mechanical & Electrical Equ i J:JTlent 1 972 0008. Transmission Line 70 000Subtotal $6 556 460+ 15% Contingency Allowance On All !tensExcept No. 7 677 540~ 10% Contingency Allowance On Item No. 7 197 000Total Direct Cost $7 431 000Eng; neeri ng 1 130 000Owner's Overhead & Administration 525 000,Total Construction Cost @ January 1982Level $9 086 000I

ESTIMATEHARZA ENGINEERING CO!IPANYC1UC4GO. ILLINOISEx hi b; t i 3Chester Lake - Alternative 2 March 1982 2 4___ Date, ________ Po;e, ___ of ___ PoQ.Structure 2500 kW, E1. 845 Estimated by Ram D. Checked by_K_T_W __ITIM Q ., UnIt".. ,.".""....1. Mobilization 1 LS $ 570 0002. Ai r Lifti ng 1 LS " $ 895 0003. Dam, Spi 11 way & Intake - -"3.1 Dam & Reservoir Clearing , 1 ACS9QO,OO5 9003.2 Diversion & Care of Water 1 LS 32 5003.3 Dam Excavation Rock 500 cy 61 . 00 30 5003.4 Drill ing 11 00 LF 17.50 19 2503.5 Dri 11 i ng Setups 90 each 260.00 23 4003.6 Grouting 400 saks 41.50 16 60C3.7 Rockbo1 ts 300 LF 28.50 8 55C3.8 Concrete, Mass 450 cy 510.00 229 SOC3.9 Concrete, Structural 100 cy 725.00 72 SOC3.10 Reinforcing Steel 24000 1 bs 1.65 39 60C3.11 Miscellaneous Metals 1600 1 bs 5.40 8 64C3.12 Rock Anchors 2100 1 bs 4.80 10 aBC3.13 Intake Excavation Rock 150 cy 77 .00 11 55C3.14 Intake Gate, Guides & Hoist 1 LS 20 ooe3.15 Outlet Gate, Guides & Hoist 1 LS 19 ooe3.16 Intake Trashracks 1 LS 18 Oar3.17 Relocate Water Supply System 1 LS 15 50'Subtotal Item 3 $ 581 07(4. Penstock - -4.1 Penstock Steel & Coup1 i ngs 180000 1 bs 3.2~ $ 585 OO(4.2 Penstock Anchor Blocks 240 Cy 875.0C 210 0014.3 Penstock Steel Supports 300000 1 bs 5.4C 162 0014.4 Penstock Rock Anchors 6000 1 bs 4.EO 28 804.5 Penstock Rock Excavation 350 cv 96.0C ~QQ4.6 Penstock Valve 1 LS 10 LQ.QI~ ,4.7 Penstock Valve House 1 l S 26 ~vr--Subtota 1 I tern 4S 1 1 055 ; 9'=II

ESTIMATEProfectBARZA ENGINEERING CO)IPANYCBIC.GO. ILLINOISChester Lake - Alternative 2 Dat. March 1982txnlDlt 13'0;.__3 __ of __ 4 __ Pa;e,... ITIM Q '1, UftIt .... A.auMS"uctur. __.;;....25~0;....;;0_kW-',:........;;E_'_. ...,;8;...,4_5_________ Estimotecl by Ram D. Checked by KTWNo.5. Powers ta t ion - -5. , Clearing1 nso sy 2 00 $ 2 1005.2 Line Dri11ing/Presp1itting 5000 SF 7 QO 39 5005.3 Excavation Rock 1550 cy4n 50 62 775,5.4 Concrete665 cy~QO MI?S~ 35D5.5 FonnworkQ7S0 SF 12 sn 1121 18755.6 Reinforcing Steel 133000 1 bs1 E;S 121 9 14505.7 Precast Concrete Roof 2420 SF ,? nn ?q 10405.8 Structural Steel Crane Support, IncludingCrane Rail A,;nn , ,",c 1 c;n h 1 Q(1()5.9 HVAC-Plumbing 1 I~ < Innn5. 13 Drains , I~ 1 1 1 !:inn5.15 Roc k Bo lts on Slope1 IS. Q:? InnnSu btota 1 Item 5 $ 892 4906. Access to Powerhouse - -6. 1 Temporary Access to Powerhouse DuringConstruction 1 LS $ 470 0006.2 Permanent Access Walkway 1 LS 50 000Subtotal Item 6 $ 520 000---4=sj ,III

ESTIMATEHARZA ENGINEERING cn:&IPANYClllc .... GO. ILLINOISEx nib i t 1 3Chester Lake - Alternative 2 DaM March 1982Structur._.......::.2.:::.;50::..:0::....:.:k~W..!.., ...,:E:.,:1:....:.---=.8....:...45=--_________ Esrimated by, __4 4Pag.' ___ of ____ PagesR am __ 0 .__ Checked by ___ KTW -....IT 1M Q. '1, Unit .... AatNMNo.7. Mechanical & E1 ec trica 1 Equipment - -7. 1 Turbine & Governor & Generator , lS : $ 1 500 0007.2 Accessory Electrical Equipment7.3 Substation & Transformer ,7.4 Supervisory Controls at Purple Lake &Messenger Cable from PH to Purple Lake1 lS 240 IQQQ.1 LS 110 0001 IS 62 0007.5 Powerhouse Crane 15 Ton , LS 60 000C\llhtnt~' TtI:MT1 7 ¢; 1 Iqn loon8. Transmission Line $ 70 000.-L-I±, I1-II

tXnlDlt 1"+ESTIMATEDARZA ENGINEERING CO~IPANYCBIC.4.GO. ILLINOISProfect CHESTER LAKE - Alternative 3 Oa~ March. 1982...ITIMNo.PaV._ol.-_of 4 Pav·sStructur. __ S...l.lI.wIDllD.lWliiLa.L..,ry,.......:-:....-Ll..uS OwD.L.....Iiok..a.W ..... ...I:E:....l1 ___ 8u.:4z..5.1..-_____ Estimated by Ram 0 Checked by KTWQI III, UNt~ A.ountl. Mobil ization $ 570 00012. I Access to Dam Site 895 00013 IDam. Soillwav & Intake 622 35514 Penstock -

Ex hi bit 1 4ESTIMATEHARZA ENGINEERING CO!IPANYCBIC .... GO. ILLINOISChester Lake - Alternative 3 March 1982 2 4'rofect ______________ Date ________ Pa;e ___ of ___ Pages1500 kW, El. 845 Ram D. KTWStructure _________________ Estimated by _____ Checked by __ _....IT 1M Q...., Unit Prica ..,.,.No.l. Mobilization 1 LS $ 570 0002. Access to Dam Site 1 LS : S 895 0003. Dam, Spillway & Intake3. 1 Dam & Reservoir Clearing, 1 AC p370.00 6 3703.2 Diversion & Care of Water 1 LS 35 1003.3 Dam Excavation Rock 500 cy 66.00 33 DOC3.4 Drill ing 11 00 LF 18.90 20 7903.5 Drilling Setups 90 each 280.00 25 2003.6 Grouting 400 saks 44.75 17 9003.7 Rockbol ts 300 LF 30.75 9 2253.8 Concrete, r~ass 450 cy 550.00 247 5003.9 Concrete, Structural 100 cy 782.00 78 2003.10 Reinforcing Steel 24000 1 bs 1. 78 42 7223.11 Miscellaneous Metals 1600 1 bs 5.80 9 2803.12 Rock Anchors 2100 1 bs 5.20 10 92:-3.13 Intake Excavation Rock 150 cy 83.00 12 4503.14 Intake Gate, Guides & Hoist 1 LS 20 0003.15 Outlet Gate. Guides & Hoist 1 LS 19 0003.16 Intake Trashracks 1 LS 18 0003.17 Relocate Water Supply SYstem 1 LS 16 700Su btota 1 I tern 3 $ Ifi22 i~;~--.l4. P~nstock - - !14.1 Penstock Steel & Couo1inas 137000 lbs 3 SO 1479 5004 fi Ppnc;tork Valvp 1 1

ESTIMATEHARZA ENGINEERING CO~IPA..NYCBIC.£.GO. ILLINOISEx h; b; t 1 4...ITIMNo.Chester Lake - Alternative 3 Do~ March 19823 4Page ___ of ___ PageSlructur._~l 5~0;.;;O--=kW..;..I,:..-=.E~1.:..-;;8...;.4,;;..5 _________ Estimated by_R_am.........;D_· __ Checkecl byQ ., UnIt,.. A.ount5. Powerhouse- - ---5.1 ClearingJtClO t:.v ? nn $ 1 17RO I5.2 Line Dri11ing/Presp1itt1ng 4800 SF7 em 17 IQ?n·5.3 Excavation Rock1460 cyL«4n c;n 59 1130 I5.4 Concrete1il n r:..v _"t90. -.no 1717 IQno5.5 Formwork 7900 SF , ? tin QR 7 !:in IJ5.6 Reinforcing Steel 108000 1 bs , ~c; I, 7P. ?nn5.7 Precast Concrete Roof 1260 SF1? no 1 c; l1?n I5.8 Structural Steel Crane Support, I nc1 ud; n9 ICrane Ra i 1 3100 1 bs 1 c;n .1. I,::;c;n5.9 HVAC-Pl umbi ng 1 LS

ESTIMATEHARZA E:-.··· ... dNEERING CO~IPANYCHICAGO. ILLINOISexhibit 14ProfectStructur •Chester Lake - Alternative 3 March 19824 4Oat. P09.of1500 kW, El. 845 Ram D.Estimated byKTWCheck.d by....ITIM Q ... , Unit PIice ~No.P0ges7. Mechanical & Electrical Equipment - -7.1 Turblne & Governor & Generator 1 LS $1 100 DOC7.2 Accessory El ectrica 1 Equipment 1 LS 200 DOC7.3 Substation & Transformer 1 LS 80 DOC7.4 Supervisory Controls at Purple Lake &Messenger Cable from PH to Purpl e Lake 1 lS 62 ODe7.5 Powerhouse Crane 10 Ton 44 00'Subtota 1 Item 7 $ 1 486 ooe8. Transmission Line 1 LS $ 70 oDer---...I-tiI\rI

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t rONOM, r ANAL YlIS (1'~"' •• H .:11"'>' EXHIBIT 16'NflAl.O" AAft"' n.nun f IIll fUnAl'I'IN NAIf. 0.0;> .. nU(.I'IUN.""I': u.O'uNfl fllfHr( lI·lf~JA"'UIA' 1911l III ru!H:'I 'N, .null Page 7 of 9""H 5('HA ... 0PAH r "At 'I PllNPI"" (HtAIO' '"'Al H,n.Pl' ",,,.Pll DI'SfL HWI'I.Pl'"'D.Pll DIE ~1I_ 'UlAl "WI'I.Pl'H'II.PlIDlfSFl IDULDIFSfl 'DUl C""Ul.nA. OFMANO Of .. INI'I 'N'AG, FNrAI:, ,",,,1:, rNrNI:Y FI ... O FII(D f I no , ,1(0 D •• 0 ... 1'1.14 D ... F 11(1. Cnu P!t(!lEN,I.'H'IIIIFO "01'111 1'0 "II'II&.FO ,rN'IIA.,0 ruSl (nSf rust cnn CO!l' cnSf CDSf CDSf C(,Sfh.'."OR,H("'.H' 'MIIH' ,...., (.. IIH' ,.....,•• 1Il~"'''. '."... 1111 ••• .5•••• '. '!aU'. .... '.'0. ..~. u •. .,.. • 51. Ill • II". 871.'•• n .... 1'. .... 11 • 1 •• 1' • .,.... '. "1'. "• JO. '. ..S. Sll. •••• "". ......1911' 5' .... " 11'.' • ,....... '. n ••. ...... '. '0. ..S. I \I.'. 211. S".".... 511. "0."'.,''''. ."'. In'.5• \u. .S. ft. I ••• S'. 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t.eUHU"IC AHAL nn __INfL,llUN ItA'l- o.ouo FUll fatAlAllON MAlf. ~.02. OIICOUNI RAlfa O.OlUMffEMfNCt UAlf,JANuAal JillAll CUIII IN I 10UOlO. In"AItIO~n~ ___ lll.Il!!JLf.@U1.ItRfD PUff ____________ _EXHIBIT 11Page 6 of 9~_ PUJL 1Jt1!!il _ lOUL __ "II!.r...LL-_HJf!.p'L1-lIIf1fL _"10.rLI"~U.t'LJ IHULL'fAR OEMANO Of MANn fNEA~' f .. fltCY 'N'M~' fNfac, fllfo 'liED fllfDifHEallED iE_EM'IED iENEKAIED ifNEKllEQ COil coa, cuallO"L J!YI!.rJ.1.tlIIl.,u.IlUIfL 'O'~L~If:UL.. JO'~L 'UMU~.fllEO OtM OtM ntM OtM fUEL coaT PAEIENICOlT CDU CO,I COli COli COli !lORIHALASKA POWER AUTHORITYMETLAKATLA POWER AND LIGHTCHESTER LAKE HYDAOEll:C fAlC PROJECTf(~nNnMtrA"IAI V~I~

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EXHIBIT 18,."i ,."1500-r---------------------------------------------,.~_~~--------~..". ,. ,. ..". ..". ,. ,J.1 ,.!J,.".-.."."'" \..,.-­"--ELECTRIC HEAT-r------------~~~----~--------------~---------------~-----t-_~ .... ~..". ..".......".--trtl-"-- FUEL OIL·Y••••••.•••.•.••••.•...•••.•....•..••••••••••••.....••.•.••.•.•••...••...........•.....•.......1000 ;-------~ WOOD S120' CORD------------------ ------ - -~~- ..-_._._._-----_._._._---_._._._._._._._--"-- WOOD 570/ CORD~-500-+------:I0II1981 1985 1990 1995YEAR1/ 2.6% FUEL ESCALATION RATEALASKA POWER AUTHORITYMETLAKLA POWER AND LIGHTCHESTER LAKE HYDROELECTRIC PROJECTECONOMIC COST OF HEATING ENERGY

4CEXHIBIT 19Page , 0 f 4~30~-----r----------~----------~------~~~---------JII~BASE CASE~< EL. 845, i.5.MW \ /~ I /z I / /~ I ~C; ,> ,," ••••z /'/'............ / /:....C // < .....•C; 20r-------~----------~----------~------------~~~~~~··~c: J' "" •• '~ "" •••• Ic: " .';" .~'""'" c··­···········~7····: .",.~..", ,:.................... I ~

PURPLE LAKE, CHESTER LAK:AND DIESEL40EXHIBIT 19Page 2 of 4- 30r------r-----------+-----------+--------~~----------~.I:~~-en~Z"" Uiz/II~~SECASEffi ~ 20r-----,---------~--------~q----------+-------~~/~~~ ~~~ /'~~ EL. 845; 1.5 MW\ ~ •~ \ ~ ......~ ;~ .......u// ..../I/;/. .'// .'// ........ .~ ....10 r-----tv---~~-+-I'-J. ~-·--·-·V""-~-tt.-":::-··~:~··~,j.:"~··-::·'-- ....·~··-·-E-L.-B-B-5-2.~5f----M-W------1~.!.._------,....................:.~I \\....~ .'~ - EL. 845; 2.5 MW~ --o~ ____ ~ __________ ~ __________ ~ __________ ~--------~1982 1985 1990 1995 2000 2005YEAR5% LOANMOST LIKELY SCENARIO OF LOAD GROWTHALASKA POWER AUTHOPITYMETLAKTLA POWER AND LIGHTCHESTER LAKE HYDROELECTRIC PROJECTCOST OF ENERGY GENERATION

40EXHIBIT 19Page 3 oi 4-.J:it:.:::-en~z~uzc~

40EXHIBIT 19Page 4 of 430r------t----------~------------~--------~+-----------J:c~:II:-en~zw(,,)Z0i=ca:wzwc">c"a:wZw'" 0~en0(,,)2010,.y~~••..••EI. 845; 1.5MW:.~2----~1~~~----------~-----------1~~-----------~~----------~2005YEAR5%'13% COMBINED RATEMOST LIKELY SCENARIOOF LOAD GROWTHALASKA POWER AUTHORITYte1ETLAKTLA POWER AND LIGHTCHESTER LAKE HYDROELECTRIC PROJEC-'COST OF ENERGY GENERATIONftURPLE LAKE. CHESTER LAKE.AND DIESEL

EXHIBI1 2CPage' 0' .:30r-----~----------~------------~----------~----~--~BASE CASE..Cl­V.C...20r------t------------------------r---~~----~--------~fEI. ses. 2.5~~ ••.............-..-.-.. .",.. ...... \•••••.••• •••••••• ... ~••• iI.J..........::.----Ei. 845: '.5MW~:..·! ___ ............ 'J••••••••••••••••• ··1 ~, - - -I ~ I'!i , :/ - '- i'- EI. 84S 2.5M"t ,----,I,0r----7~==~-~--_+t_--------+---------~--------~~.~2------'.~8-S-----------,-I9~O-----------,-"~S------------~~oo------.......... --.J20C:YEA~'2"~ REVENUE BONOSLOW SCENARIO OF LOAD GROWTHALASKA POWE~ AUTHORiT,\,M£TLAKTLA POWER ANC LIGHTCHESTER LAKE HYDROELECTRIC PROJECTCOST OF ENE RGY GENE RA ilO~PUFlP~E.. AKe.. CI-4ES"I"El:; LAKEAllie DIESE~

EXHIBIT 20Page 2 of 43 0/BASE CASE _____! 20j:c=:!AIZwt:l>t:l=:wZ!AI~o...enou 10VLo-'~•-~ ~..~,~ f/,'••••••••---..:;-----_-----/If···········••••••V......r- EI. 885; 2.5MW..........• ~4EI. 845; 2.5MW...••:.;,;;,;~/e ••.:.;.,.....-:;,ifjEI. 845; 1.5MWo1982 1985 1190 1995 2000 2005YEAR5% LOANLOW SCENARIO OF LOAD GROWTHALASKA POWER AUTHORITYMETLAKTLA POWER AND LIGHTCHESTER LAKE HYDROELECTRIC PROJECTCOST OF ENERGY GENERATIONPURPLE LAKE, CMESTER LAKEAND DIESEL

40EXHIBIT 20Page 3 of 430r-------r-----------~----------_+------------+_----~----~BASE CASE-.II)~Zu.iUZo 20r-------r------------+------------4-----~~--~------------~~«u.i"Z~ I.>c.:l" u.iZu.iU.o~II)ou10r-----~------------~~---------+------------~----------~rEI 885; 2.SMW;joII'................ ..... -,-l••· -----..."".................. ~~ - \l!:-:.............. .... --J, - - - - _ -" EI. 845; 1.5MW_ - - ""/ EI. 845; 2.5MW 'Io~ ____ ~ ____________ ~ __________ ~ ____________ ~ __________ ~19901982 1985 1995 2005YEAR20005% RATE OF RETURNLOW SCENARIO OF LOAD GROWTHALASKA POWER AUTHORITYMETLAKTLA POWER AND LIGHTCHESTER LAKE HYDROELECTRIC PROJECTCOST OF ENERGY GENERATIONPURPLE LAKE. CHESTER LAKEAND DIESEL

40EXHIBIT 20Page 4 of 430r------t----------~r_----------+_----------~----~----~BASE CASE! 20r-----r---------~--------~--~~--+_------~i=cc:c'" Z'" c:J>c:Jc:cZ '"'"~oI­mo

EXHIBIT 2i4Ur-______ ~--------------------jr--~.----------------------~P~a~9~e-'~O~;~4.//\----J-- _~~ J.',I.,...I ~ DIESEL 2.5 MWI •••• I ;30j----~I~·~··----~------~I------~------~I ........' I;z(liI :J

I•.'I•I .IEXHI BIT 21Page 2 of 430~• ~-CIt...Zto)""Z0i=c(c:z """" CI>CIc:"" ZIoU~0...CIt0U2010/~.I•I.I../J?,,/'''-- DIESEL 2.5_~ TOTAL DIESEL COMPONENT OF BASE CASEIIEL. 885; ~.5 MWAEL. 845: 1.5 MW + 1.0 MW@ PURPLE LAKE..... ......~ ..... ~~..---..: l~~~••••1•...... 4'11 .... I"'""~ ......;.;............ 1..--_---.. -----~~-I-~- ..L-t-- ..... __ --. ~-lE L. 845; 2.5 MWEL. 845; 1.5 MW~-~o19821985 1990 1995 2000 2005YEAR5% LOANMOST LIKELY SCENARIO OF LOAD UROWTHALASKA POWER AUTHORITYMETLAKTLA POWER AND LIGHTCHESTER LAKE HYDROELECTRIC PROJECTCOST OF ENERGY GENERATIONCHESTE~lAKE ONlY

:i./ iIIi/./iII; JI. IEXHIBIT 21Page 3 ot AI' I'\ IJ.i L DIE~ELi.lI2.5 MW~~----~--------~~--------+----------t--------~i : ,V¥CI)-­~Z~(,,)z~ ! // \! I :~ 1./· "-- T~TAL DIESEL COMPONENT OF BASE CASE~ r i i :G 20~------~~----------~------------~------------r-!-----------1~ r ! I Iz~~o~IIIC(,,)III !II : IIiI ;-EL. 885; ~5 MWIIIf......... YE, .....V ' .....r-~-YIIIIIII,IIIL. 845: 1.5 MW ... 1.0 MWVi PURPLE LAKE10 ~---~;~-::,.:--.-.:.::!.:.L-...,.;::_ ... -:,L._ ••_-----:I-------T""\------11 ----'- ..... ...••• I :..." .....I __ .:.r~".nn ...... ~ n.sR7n'n ..............-::.MoIo~~: iI --~ I __------r-I-~ ___ =I------I I II ! I IL ~L. 845; 1.5 MWL IEL. 845; 2.5 MWII•0 i'982 1985 '990 '995 2000 200::YEARIII5% RATE OF RETURNMOST LIKELY SCENARIO OF LOAD GROWTHALASKA POWER AUTHORITYMETLAKTLA POW-ER AND LIGHTCHESTER LAKE HYDROELECTRIC PROJECTCOST OF ENERGY GENERATION

40(7.I•/' TOTAL DIESEL COMPONENT OF BASE CASEII..•I•~ DIESEL 2.5MWEXHIBIT 21Page 4 of 4I3or------r----------~----------~---------+----------~-/- ~..r...../- ••• I/_ ..........- EI. 845; 1.5MlW + 1.OMW • PUFFLE LAKEEI. 885; 2.5MW. ,...... .... .I-. . ..... ........... .Z -. •••••• ~o 2O~------~~~----~~~~~.--------.~.~I.. ~.~.~.~ .. ~.~.~ .. ~.~ ..-.-.----+---~~.~~~~~ K, --~. --=-.....~-E-I."""84-5::::: ---~ .......... ~ i ,. ~-----__ ~ .........,..., ----~Ij,j .......... , ...... - -_ ... -Z 1-..... ,~_--Ij,j....._--~ 4--EI. 845; 1.5MWeno(.)10r------t-----------t----------~----------~----------~~.·~2-----'~9~8~5-----------199~O-----------'-99~5-----------~~-----------2~OO5YEAR5%/13% COMBINED RATEMOST LIKELY SCENARIO OF LOAD GROWTHALASKA POWER AUTHORITYMETLAKTLA POWER AND LIGHTCHESTER LAKE HYDROELECTRIC PROJECTCOST OF ENERGY GENERATIONCHESTER LAKE ONLY

so".'.-'. -.•••• 1 /1••••-+---------...,If-or~·--I, I,I ,Ii 'V~ 01 ESE L 2.5M'I... -.. ----I -{OITAL OIESEL COMP~NENT/ OF BASE CASEEXHIBIT 22Page , of 4~~--~------~--4"~~~~1------~------~Ie. j,- ,,--ii ······1.... ~~ .. ~5 2.5MW. ...... ,. .....~ , .~ .•--------.~.ft._I": .......... .~.: 845: 1.5MW + 1.0MW ~ PURPLE LAKE~ 30r-------~+---~~~~~~--------~1---~~~------~~~~~I~~::........z....o~IIICUt .......I'" '" "~El. 845; 2.SMW'"'" '" ''"' ....., "-----------"..... ,_-......_ ... -I!L- El. 845; 1.5MW20r-----~--~--------------------~----------------------~1019~8~2----~'9~8~5------------'9~9-0-----------1-9~9-5-----------2-0~OO----------~200:VEAR12"10 REVENUE BONOSLOW SCENARIO OF LOAO GROWTHALASKA POWER AUTHOR~T'IMETLAKTLA POWER AND LIGH~CHESTER LAKE HVOROELECTRIC PROJEC;'COST OF ENERGY GENERATIOI\

40EXHIBIT 22Page 2 of 4•I•I,:,-- DIESEL 2.5MW,~ --~------1I----.i-.-- ~ - -~ - - --.-----------1•TOTAL DIESEL COMPONENT OF BASE CASEI•••30~---- 7-n----I•I•I•• /--~6- -_-------+--I•~ ... .....EI. "5; 1.5MW + 1.OMW @ PURPLE LAKEzo~«cr........z">" cr....z....~o~II)ou20..... L EI. 885; 2.5MW•• ••-+-f.--- ••••- ...-;:-- ........... ..............................--~'. • ____ EI. 845; 2.SMW --_____,---...--~ -~~.....------~~~------~I~--~··~·~~ -----+--~--~=--~......... -~...-"'-...._---_...-,II I--110r-----~~----------~------------------- ~ ~ -~EI. "5; 1.5MW~9~8-2------19~8~5-----------1-9~9-0------------~-----------2~0-OO----------~2005YEAR5'1 LOANLOW S :ENARIO OF LOAD GROWTHALASKA POWER AUTHORITYMETLAKTLA POWER ANO LIGHTCHESTER LAKE HYOROELECTRIC PROJECTCOST OF ENE RGY GENE RATIONCHESTER LAKE ONLY

-~!t~-CII~ZwCo)Z0~

40...... ,. 1••••••••••••• f.. r ..,-I.·TOTAL DIESEL CQMPONEN OF BASE CASE-.,,,,:. I--. ... DIESEL 2.5MWr~-EXHIBIT 22Page 4 of 4•tt.&: ..~ "1-'-'~ ----......---~ 11/ .... __' __ --.. Ir- EI. 1N5; 2.5MW .~ t --'~~' ~(.) ./ ',1'---.. ~-~~ 20r-----~~rl~~------~------'--,~.~~.d---~--~~~-~_+-----------~~ V -I-' .--1------~ EI. 1N5; 1.5MW>C-'a:wzw~o~eno(.)10r-----~------------~----------_+------------+_----------~o~ ____ ~ __________ ~ __________ ~ __________ ~ ________ ~1982 1985 1990YEAR1995 2000 20055%/13'% COMBINED RATELOW SCENARIO OF LOAD GROWTHALASKA POWER AUTHORITYMETLAKTLA POWER AND LIGHTCHESTER LAKE HYDROELECTRIC PROJECTCOST OF ENERGY GENERATIONCHESTER LAKE ONLY

FUEL OIL; I-~~T-----------~~--------------~--~~~-------JEXHIBIT 23fit~S ~1r------------~~------~~~~~~~------------:'~~y .~> .,~o ~., •« ~ •~ .~"o ,~z ~1-----------~~~~~~----~~~~------------~~c--WOOD S110ICORD!!"" :t..IC~ 1~1r----------~r--r~~---------------+------------~~·~~~·JQ~ .~.~ .~« .-'..I.-'~ • -' -'~ WOOD SlOt CORD tlz~.-'! '~ir---------------r--------~~~~-----+-------------------J.... ., ..."". . ..""...."". ..,.,.. .. .,.,.. . .."". .~1-----------~--------------~--------------~o~----------~------------~------------J'111 '16ftAR1W5NOTES:11 1981 PRICE LEVEL. ",. INFLATION RATEY 1981 PRICE LEVEL. ",. INFLATION RATE• 2.8% FUEL ESCALATION RATELEGEND-ELECTRIC HEAT1~ REV. BONDS•••••••••••••••••••• 5%/1~ CCWBINED RATE------ K LOAN- - - - K RATE OF RETURNALASKA POWER AUTHORITVMETLAKLA POWER AND LIGHTANNUAL COST OF HEATING ENERGYMOST LIKELY SCENARIO OF LOAD GROWTH

~.-----------~----------------~------------~ IFUEL~'~_EXHIBIT 24tit3000;---------------+---------~~~~~----~~/~--------~................~...........enI-en 25000(,)>t.:lc:z "'""'"t.:lZ 2000~cs:"'" %:~cs:~ZQ "'"inwc:1500~cs::lZ 1000cs:.".. . ."...". ."... . ."...".."....IWOODS120/CORD 11". ".". ".".." .~WOOD S70/CORD 1/500~---------------+-------------------+------------------~NOTES:o;-------------+---------------~--------------~1981 198511 1981 PRICE LEVEL 81 7% INFLATION RATEY 1981 PRICE LEVEL 81 7% INFLATION RATE81 2.6% FUEL ESCALATION RATEYEAR1990 1995LEGEND-ELECTRIC HEAT--- 12% REV. BONDS.................... 5%/13% COMBINED RATE------ 5% LOAN- - - - 5% RATE OF RETURNALASKA POWER AUTHORITYMETLAKLA POWER AND LIGHTANNUAL COST OF HEATING ENERGYLOW SCENARIO OF LOAD GROWTH

[ "%i ~." .. -,._- ... -.L EXHIBIT 25r\>\1:/~",V;-[ '"r/r ~~ ~f'C)/-~.---/'."ALASKA POWER AUTHORITYMETLAKATLA POWER AND LIGHT'---CHESTER LAKE HYDROELECTRIC PROJECT, ../\.. .. ///I/,,ENGINEERING C;::OMPANY·,/--' ( '--I/ I"~- ;oEbEMBgR' ;1981I/"'(~ .. ~'GENERAL MAP

[[,--------------------------------------------------------------------------------aA~n' ,EXHIBIT 26EI~rrPORT CHESTER[.r[[CHESTER LAKE\J ...... 2-15 . .3LE[[Lt -::·· ..-'t[~[_ HARZA ENGINEERING COMPANY JANUARY 1982tJ~/umFI.O· Mun 1"",1' /0" "~,,,. (Af~('r)ALASKA POWER AUTHORITYMETLAKATLA POWER AND LIGHTCHESTER LAKE HYDROELECTRIC PROJECTGENERAL PLAN

~~EXHIBIT2.7....!.II!.IIM:; •• NI>I'm:11tfl(El8IW}900BOO700600500.,. 400zoi=!.II-I!.II300~-~ 'lB2?'jr q,D'v':41 EI.8ffl,O/~, ,. '~~::~~b1!"""""--":'::"'~ --,i~ ~.~r--,.,~" ""~. ,~~~". 0~.,~~~ II... ---'i,, !,"\,, if'

\ \"\\( / II~L/dl,Oll ~Oa0;o'"SCALE ~~_~-"-_~_ 10 20 30 40 50,60 FEET-HARZA COMPANYENGINEE_~R~IN~G~ _ JANUARY 1982________________________(NLLIY)METLAKAER LAKECHESTR AUTHORITYALASKA POWE ER AND LIGHTTLA POWTRIC PROJECTHYDROELECWAYDAM AND SPILLPLAN

EXHIBIT 29[{/~J("N~Itf.1V. a8es.o3'-0'IiI: .., ,Flo"as~\ll. ~.05r_c ....'~;;:~f7chors~FSECTION THR(J INTAKESECTION THRU SF/lurAY~".'rLl.a:....!;;:~~9a:....~Z~....:::l....>0CD~~........10.IZ0~~.... >..J....900890880870860850840830820M...,;cip~' M.'rrI

[---.r-~--------____r ,AIL~i------- '~.''- .,nn I S,.ilMy>td.w~~L,,_,AlMP~"Irlmb-mell.F5.SO~\\\\\I\\\IIIIIIs,.,~r~ndCo.i':ro/ t:rJbicJnr ~[8-8PLANEL Ill![1:JpOfCr.Mr;,; E/.~t~~~~~~':.. I '~" .-1..:...":""':""'::';';',.."-'; 'l;.'.:.-'..!,·cc".:..·.;...•. .:.....c.",. o'~· ':'='.--'--'-'-'-'-'-'-;d., :',r--------.Ic-cI...SCALE 0 10 15~o FEETHARZA ENGINEERING COMPANY JANUARY 1962A-A(£lrctfYC~1 ~quipfT>ffl'noI'fI_")D~'umll, O·M'-""'{w~rlowM1~"(MLUY)ALASKA POWER AUTHORITYMETLAKA TLA POWER AND LIGHTCHESTER LAK~HYDROELECTRIC PROJECTPOWERHOUSEPLAN & SEcnONS

.---------------------.12.5 KV.~¢li"e • ~ ______________ '2~ KV • .3¢ti,"To fVpW LdbH~""'f----------------:llI I i.~ - To' Ale/14k .. fl ..L~SYMBOLSEXHIBIT 31[)Oil Cir",d 6r,~J

Itr!H­l,(-+-••• rtt•q:rr-W4t+~I..,..,~, .L++-J-~ti8~I+~'Eti~i '. "i-1~T+~~=Iii fEI:;::H-t ttH· t;-!-'tt,, -if.-t+, J+[+"~~-.. I+~ p::::r h + IT ,+~'~ilif 1"t ... \' .. -"..,..4 . T -1.,~-t~. 1 "" +t-\~.'+

~-------------------------------------- ,EXHIBIT 33r[r.f,ritl~[[~If~~[E~--__ -_--~~.o~-------.---,-----.----,--.'-- ,._- ---DESCRIPTIONEQUiPMENT CONTRACT DOCUMENTS- --- --------------------.-------- ._-------------~1982 1983 1984 1985_______ . ____ ~_~~,:M;A~~~t\~.O~N-DJ-f M.A_:M J Jf ;~IINl~ J~'~~-~IJ J·A-r~ O!N;D-~-F~~~~~~-~~~r~b1 1 ' '! ,- 1 ! I I! PREPARE I BID' AWARD ! .: I i I ; I " _ 'i ~: I.. - - - ,- -~-'--=i;I~I~,~;-l~----- ., --r------ -+- I I ! ' i I i .-~ -- -----7"-1'- !' 1 I ' -; -r-!f.--l-i___, i I !--:-!-:~7.. i-:-~, _,I!' ~ : ~'H--.L--;~+ f-1--' .~~ - ,- -l-':I+i-II ~;~P~RE ' __ 6.10: ..P-'!i.~ 0 __ ..-"-_L. i, !..L I I ' !! : 1 I ' , "T ~: : t ,-~t rCON S T R U C TI 0 NCO N T RAe T DOC U MEN T S : .... 1 ""'~III1", A ; , I ; 'i: I ,- ~---1, I. i; :! __ ~-I~_liA~tO~'---.--------- -------------- .~-~-J~TT I- ~.: ' : \ ; - 1 .~ :--; ~--:--t ' i !: I ~I :1DAM E X C A V A T ION &. G R 0 UTI N G ,- Sf : C. I I JIiiiIIaD i i--. ___ --?'A M- -~-O~-S-T-R-U-C-TI-O-_~---~~-N_? ~;-~~-~ S~- --.-- -, __ ~r-, f: i '~-:: ;':-T -~rl-H;l; ':' I: :I! IPENSTOCK FABRICATION i : :' : 1 ; , IPENSTOCK INSTALLATION(---------- . -POWERHOUSE EXCAVATION1----- --- --~- ----. -- -- - - - - -.--POWERHOUSE CONCRETE--~-- -~.... --~,

APPENDIX AGEOLOGY OF FOUNDATIONSANDCONSTRUCTION MATERIALS

Ip~AnLareC.neerlwi th e .....hazards",Appendix AGEOLOGY OF FOUNDATIONS AND CONSTRUCTION MATERIALS~ologic investigations of the Chester Lake Project wereJ out during November and early December 1981 in order toand supplement previous studies, to investigate founda­)nditions and construction materials, and to assist ininary layouts and cost estimates.he engineering geology considerations significant to thecal feasibility and cost estimates of the proposed civilures are described below.us Stud ieshe geology of Annette Island has been studied previously:major work being done by the U.S. Geological Survey." the Geologic Map of Annette Island (Berg, 1972).Jment on engineering geology and seismicity of the.blished in 1977 and is entitled "Reconnaissance Engi­Jlogy of the Metlakatla Area, Annette Island, Alaska,Isis on evaluation of earthquakes and other geologicby L. A. Yehle, USGS.Previous geologic studies for the development of hydroelectric genera t ion from Chester Lake were cond ucted by Robert ~~.Retherford Associates, Definite profect Report, Chester Lake ~­droelectric Project (1977). Many 0 the geologic findings presentedin the Deflnite Project Report are confirmed and ex~andedupon in this present study.Geologic Investigations 1981Drilling Program. An exploratory drilling program was conductedduring November and December 1981 (November 9 to December12) by a two man crew using a portable Winkie drill (drillingcontractor Salisbury & Dietz Inc.) under the direction of afield geologist. Geologic logs and water pressure tests of thedrill holes are included as Annex A. The drilling program included560 feet of drilling in 11 holes to determine the thicknessand nature of overburden materials, the quality and ext~ntof weathering of foundation rock and to obtain samples for laboratorytesting. Seven holes were drilled along the proposedChester Lake darn axis, two holes were drilled along the penstockalignment and one hole was drilled at each of two alternativepowerhouse locations (Exhibit A-l). Water pressure testing wasperformed on drill holes in the dam foundation to determinepermeability of the rock for evaluation of seepage control measures.Water pressure tests were also performed to determine theIIA-l

depth of open jointing. for evaluation of anchorage Jrnents.Geologic Mapping. Reconnaissance level geolog.was conducted in the general project area. More de1 logicmapping was conducted at the damsite, along theroute and at the powerhouse. U.S.G.S. topography, t1:10,000 scale, was utilized for plotting geologic:within the general project area. Field sketch mapsfor plotting geologic features at specific structurEthe data were later transferred to surveyed base ~albecame available. Geologic mapping included measurtjointing and foliation to evaluate rock stability.and quality, and the extent and depth of overburdenalso were mapped to provide information for engineeJ ~estimates. Rock samples were collected for petrographic examinationfor use as concrete aggregate during the design phase.It is anticipated that some additional work will be requiredon site at the design stage to field check the plottingof data. This work also will include more detailed mappingthat was not completed during the field period due to snow andice cover.Regional Geology. .Southeastern Alaska is typified by interconnected mountainranges, often partially subnerged, which have undergone severalepisodes of folding, faulting and igneous intrusion resulting inextremely complex geology.Annette Island is typified by rugged mountainous terrain ofmoderately high relief rising to 3600 feet on Tamgas Mountain.The Metlakatla Peninsula is a large area of low relief.The main body of Annette Island is composed of a complexgranitic intrusive called the Annette pluton. The Annette plutonis of Silurian age (+416 million years) and is surrounded bya fringe of predominantly low grade metamorphosed volcanics andsediments ranging in age from Silurian or older to Jurassic.The Metlakatla Peninsula consists of low and medium grade metamorphosedvolcaniclastic and pelitic sediments of Silurian ageor older. These metasediments have been intruded in severalareas by igneous rocks which may be similar in age to those ofthe Annette pluton. Later intrusion of ultramafic dunite andpyroxenite occurred during Cretaceous time.The Annette pluton has undergone hydrothermal alterationand much of the originally low mafic mineral content has beenaltered to chlorite. Foliation is developed to various degreesA-2

in portions of the pluton with border areas being the most affected(Berg, 1972).The project area has undergone several episodes of glaciationduring the Pleistocene Epoch and bedrock is exposed in wanyareas as glacially rounded and smoothed outcrops. The presentgeomorphology results mainly from the Wisconsinan Glaciationwhich developed "Un shaped valleys with steep sides and moregentle val-ley bottoms. Chester Lake is a cirque lake eroded bya small val-ley glacier. The relatively high ele~ation of ChesterLake and the steep profile of Waterfall Creek, which drainsit, indicate that Chester Lake basin i$ prooably a hanging valleywith respect to the larger valley occupied by NicholsPassage and Port Chester.Tectonic Setting. Southeastern Alaska is part of the tectonicallyactive region which rims much of the Pacific Ocean.The region is situated along the western margin of the NorthAmerican Plate close to the contact with the northwesterly movingPacific Plate. Large scale tectonic deformation has takenplace in several episodes since early Paleozoic times with thelast major events occurring during Tertiary time. Lesser activitycontinues to the present time.The regional structural grain is strongly developed in anorthwesterly to northerly direction with most major fault zonesand lineaments paralleling this trend. Many of these largefaults, chiefly the offshore Queen Charlotte-Chichagof-Baranof­Fairweather fault and the more inland Chathan Strait-Lynn Canalfault are major zones of active tectonic activity (Exhibit A-2).The Sandspit fault, possibly a branch of the Queen Charlottefault, lying along the eastern part of the Queen Charlotte Islandsis the closest known active fault to the project site.Movement along these faults is considered to be right lateralstrike-slip with displacements in the order of many miles.Vertical displacements are also believed to have occurred alongthese fault zones but this movement is thought to be subordinateto lateral displacement. To the northwest, along the Gulf ofAlaska and southern interior Alaska, these fault zones probablymerge with the Transition fault and the Chugach-St. Elias fault.Displace-ments in this area are mainly the result of thrustfaulting.The Clarence Strait lineament, which coincides with thewaterway of the same name, is a prominent linear feature expressedtopographically and on air photos and LANDSAT imagery.It is thought to be a fault but its origin is speculative asmuch of its length is covered by water or overburden. If it isa fault, large scale lateral movement along the Clarence StraitA-3

lineanlent seems unlikely and its origin may be that of a rift orgraben (Yehle, 1977).Fa ul ts are common in the reg ion of the proj ect and mos tfaults are thought to be high angle normal or strike-slipfaults. The amount of displacement along these faults is unknownbut major movements are thought to have ended by middleTertiary time.Several thrust faults have been mapped on Gravina and AnnetteIslands and possess similar characteristics. One of thesethrust faults, characterized by a zone of sheared rock about onenile wide, occurs along the contact of the Annette pluton andthe meta-sediments of the Metlakatla Peninsula, immediatelyadjacent to the project site. The thrust faulting is believedto have occurred between late Jurassic and middle Tertiary time.Later normal or strike-slip faulting along the sarne alignment isbelieved to be partly responsible for the shearing and isthought to have occurred during later miJdle Tertiary time.evidence of recent movement has been found in the area and thisfault is not believea to be connected to any major re~ionalfaults along which recent movements are known. . .seismicit~. The project area lies within a broad zone ofearthquake actlvity which includes much of coastal British Colombia,southeastern Alaska and along the Gulf of Alaska.Earthquakes in the region have been instrumentally recordedsince 1899 and include many strong motion events. Relativelylarge magnitude earthquakes will continue to affect the projectarea as they have in the past. Tsunamis and seiches have attimes accompanied large underwater earthquakes.Exhibit A-3 includes an epicenter plot and tabulation ofall earthquakes recorded within a 500 krn radius of the projecthaving magnitudes of 3.0 (Richter) or greater. Most of theseismic activity occurs along the Queen Charlotte and Sandspitfault system which suggests a general relationshi~ between someextensive groups of earthquakes and certain fault zones. Themost recent of the large size earthquakes in this zones was a7.25 magnitude (Richter) event on July 30, 1972 with the epicenterlocated approximately 200 miles northwest of the project(Sitka earthquake).The largest recorded seismic event to occur in the regionwas an B.l magnitude earthquake on August 22, 1949 with theepicenter located 120 miles southwest of Metlakatla probablyalong the Queen Charlotte faul t. tJo shock was reported as be ingfelt on Annette Island but the earthquake was strongly felt a~ccaused some damage in Craig, Prince of Wales Island and otherNoA-4

places. Reports of damage indicate that the maximum intensityof the earthquake was in the range of VII (Modified Mercalliscale). Such an intensity would cause negligible damage to awell designed and constructed structure.A magnitude 7.0 earthquake occurred on May 26, 1929, possiblyalong the Sandspit fault on the east coast of the QueenCharlotte Islands or Hecate Strait. The Sandspit fault is abranch of the active Queen Charlotte fault and may be a majorcontributor to the seismic activity of the Metlakatla area(Yehle, 1977). The earthquake was reported as being felt inKetchikan, but not on Annette Island which is nearer to theepicenter, 285 miles from the project. This earthquake is significantin that it occurred possibly along the active faultclosest to the project.Several earthquakes within 50 miles of the project, havingmagnitudes less than 5.0 (or no magnitude computed) have beenreported (Yehle, 1977). These events are not supported by ExhibitA-3, however, and their locations and magnitudes are inquestion.Historic earthquake records and the regional tectonicframework indicate that earthquakes of similar magnitude andrelative location are likely to occur in the future. Previousstudies (including Yehle, 1977) suggest that the project islocated in an area of moderate to high seismic risk (UniformBuilding Code and u.s. Corps of Engineers, Seismic Zone 2 to 3)and could experience earthquakes in excess of magnitude 6.0.A map showing the distribution of the peak acceleration ofearthquakes based on a 100 year period was produced by Milne andDavenport (1969) and indicates that a peak acceleration of up to0.15g might be expected in the project area.An estimate of peak bedrock acceleration was obtained forthis report using magnitude - distance attenuation curves developedby Schnabel and Seed (1972). These studies were conductedby transposing the largest known regional earthquake along theactive fault closest to the project. In this case a magnitude8.1 event would be located at a distance of 75 miles along theSandpit fault causing a peak bedrock acceleration of 0.07g.Based on the historic record of regional intensities and previousstudies by others this is considered to be low.For the feasibility stage of the project, following preliminarystudies, it is thus considered that a conservative figureof 0.15 g should be assigned for peak seismic acceleration inrock. Further studies, including the determination of the maxi-A-5

mum credible earthquake, are required during design phase toverify this.Project GeologyOverburden Materials. Overburden in the project area isgenerally thin and should not greatly affect the proposed layout.The most common types of overburden are colluvium andtalus caused by mass wasting of rock slopes, although some depositsof glacial origin occur locally.Colluvium is the most widespread overburden type and occurson moderate slopes at the damsite, in the reservoir and alongthe penstock route. It consists of angular sand, gravel andboulders of granitic material ranging in depth from a few inchesto several feet. Clay and silt size material in the colluviumis sparse and this material is relatively free draining.Talus occurs at the base of steep rock slopes, and consistsof moderately weathered angular boulders of granitic material upto five feet diameter with only a small percentage of gravel andfiner fractions. Small accumulations of talus up to about 5feet maximum depth occur at the damsite and along the penstocK··route. Within the reservoir area, especially along the northwesternand southwestern shores of Chester Lake, thicker accu~ulationsof apparently stable talus occur. The thickness of thetalus in these areas was not investigated but it is expectedthat depths exceed 25 feet.A thick accumulation of talus occurs near the base of theexisting water supply line, extending from below sea level up toelevation 200 feet. It extends laterally from the present endof Walden Point Road to about 550 feet south of the presentpowerhouse. Based on data from drill hole PH-3, which encountered16 feet of talus, as well as on areal mapping and changesin vegetation, it is considered that the thickness of this talusincreases greatly to the south of PH-3.OVerburden of glacial origin occurs only in scattered areaswithin the project area. A prominent moraine occurs on thesoutheast shore of Chester Lake and continues up to elevation1400 feet. This deposit consists of large angular blocks andsome finer rubble. A thin deposit of possible glacial till,weathered sand and gravel, occurs along the old penstock routeon a small knoll near elevation 250 feet.Bedrock Geology. Rock Types: Fresh bedrock is well exposedin the proJect area and varies considerably in color fromwhite to green-grey. The rock is medium grained, hard andstrong and possesses a crudely foliated granitic texture. TheA-6

ock is composed mainly Of plagioclase, quartz and orthoclasewith lesser amounts of chlorite, muscovite, biotite, hornblendeand disseminated pyrite. The variable percentages of the variousmineral constituents causes the differences in color. outcropsare often surficially weathered causing a darkening incolor compared to fresh exposures. On weathered surfaces therock varies from off-white and light yellow brown to mediumgrey.These rocks are part of the Annette pluton, 'a complex graniticintrusion, which comprises a large part of Annette Island.Rock types, which comprise the Annette.pluton include granite,granodiorite and quartzdiorite. These -changes in compositionappear to result from original zonation within the Annette plutonand contacts between the various rock types are mostly gradational(Berg, 1972). Samples of various rock types within theproject have been collected for petrographic examination duringdesign phase and the exact nomenclature will have to await theseresults. It does not appear that any significant differences inengineering characteristics exist between the various rocktypes.Light grey to green-grey rocks, tentatively identified asgranodiorite, appear to predominate and are exposed at the damsiteand throughout most of the penstock route as well as thepowerhouse location. Several areas of light colored graniticrock are exposed along the penstock route between elevation 750and 650 feet as well as scattered outcrops at lower elevationsalong the water supply line. Scattered outcrops of graniticrock are also exposed along the old penstock route between elevation250 and 350 feet.Foliation •. Foliation, variably developed in the projectarea, is characterized by the subparallel alignment of interstitialchlorite and mica and to a much lesser extent, by the orientationof feldspar laths. In most hand specimens only crudefoliation can be observed by the presence of thin chlorite ribbonsbut in larger outcrops this foliation becomes considerablymore apparent. Foliation is best developed at the damsite andin the powerhouse location. Foliation appears to be less developedalong most of the penstock route but its apparent absencemay be caused by the glacial smoothing of outcrops making foliationless obvious.Several zones of more pronounced foliation, 3 to 8 feet inwidth, are exposed on the abutments of the damsite and exhibit asomewhat gneissic or schistose texture due to a higher percentageof chlorite. These intervals, somewhat more weathered thanthe rock mass, occur as shallow grooves in the generally roundedoutcrops. A greater degree of iron staining and subparallelA-7

intrusions of milky quartz also typify these more pronounced,foliated zones. Chloritic surfaces and joint surfaces in themore foliated zones are often slickensided indicating that someadjustment has taken place along these weaker zones.At the damsite, foliation strikes N25-40E and dips essentiallyvertical with some minor variance to the southeast andnorthwest. At the powerhouse, and to the south, foliationstrikes almost due north and dips 49° to 54° to ~he west.Jointing. Jointing is well developed i~ the projectarea and is extemely variable in both strike and dip. The mostprominent joints are stress-relief joints caused by glacial unloading.These joints develop subparallel to rock slopes andrange in attitude from subhorizontal to moderately dipping. Thestrike and dip of these joints varies considerably depending onthe slopes to which they are related.At the damsite (Exhibit A-4) these shallow downstreamdipping joints are prominently developed on both abutments andare a source of minor ground water seepage. In places, thesejoints have been eroded several feet deep into the abutments.It appears that at least part of the erosion is due to dislodg~·ing of rock blocks by freeze-thaw action.Drill holes at the d~msite indicate that these shallovdipping joints are open and weathered in places but they do notappear to be continuous in this condition for great distancesand are often unweathered and tight. Spacing of these shallowdipping joints varies from 0.5 to 5 feet and appears to be anear surface feature. The occurrence of these joints decreasesconsiderably below ten to fifteen feet depth.Stress-relief jointing is noted also along the penstockroute and much of the gradient along the middle course of WaterfallCreek appears to follow this jointing.A prominent joint set striking between N60W and N80W anddipping 65° to 90° northeast is well developed at the damsiteand along Waterfall Creek. Joints in this set are spaced aboutthree feet but zones of closer spacing to one foot are evidentin some areas downstream of the proposed axis. These joints arechlorite coated and appear relatively tight. The course ofWaterfall Creek appears to be partially controlled by this jointorientation.Other joint sets are difficult to identify because of largedivergence in strike and dip. However, joints striking 1120W toNlOE are common especially along the penstock alignment. Thesejoints exhibit extreme variance in dip but in general dip frOf;\A-8

35 to 90° to the east. In places these joint surfaces are polishedand slickensided, slightly weathered and exhibit a purpleto pink coloration.Joint planes subparallel to foliation are exposed in outcropand in drill core. These joints are best developed inzones of pronounced foliation at the damsite and are oftenslickensided.Most joint surfaces observed in core are chl'prite coatedand tight. Slight weathering and iron staining along joints isa common occurrence within 20 feet of 9round surface and thengenerally decreases. Isolated iron staining and some weatheringoccurs along individual j~ints and along jointed intervalsthrough the entire depth of the holes drilled. Slickensidesoccur on some joint surfaces but are generally restricted tomore closely jointed intervals. Traces of clay along jointsurfaces occur only sporadically along the more highly weatheredjoints, but this is not common. In only one instance was clayrecovered in core. The clay, about 1/4 inch thick in hole RB-3,is light brown and slightly plastic and appears to have been theresult of weathering of chlorite. In highly fractured intervalssand-sized particles occur and appear in part to be the resultof physical disintegration of the rock. Some of this sand sizematerial may also be the result of mechanical breakage duringthe coring operation.Faults. and Shear Zones. Three linear zones of highlyfractured rock occur within the project area and these have beeninterpreted as faults and/or shear zones (Exhibit A-I). Themost prominent of these highly fractured lineal features occurson the northern side of the Chester Lake basin, where a rockscarp 20 to 50 feet high trends N50E from the shore of ChesterLake to the northern ridge of the drainage basin. Rock exposuresalong the scarp are highly fractured and jointed with jointorientations ranging from N40E to N6SE and dipping predominantlyto the southeast at a high angle. Higher than normal concentrationsof chlorite, iron staining and healing by quartz intrusiontypify this area.The scarp enters the western end of the Chester Lake about500 feet northwest of the narrow neck formed by the existingdam. No highly fractured rock similar to the scarp area wasfound along the western shore of Chester Lake, close to theproposed damsite. Based on aerial photos and field mapping, thescarp linear appears to continue across Chester Lake, under thetalus covered lower portion of the deep left abutment and up thesouthwestern side of the basin and through a narrow gap in thesouthern basin area. Closely fractured rock similar to thatexposed along the scarp occurs on both sides of this narrow gap.A-9

Jointing is closely spaced and strikes from NIOE to U30E anddips 75°-90° southeast.A second area of highly fractured rock occurs north andeast of the powerhouse location. This zone has been mapped as afault by the USGS (Berg, 1972). In this area closely fracturedand sheared rock is exposed along stream beds and scatteredoutcrops. The major trend of jointing is N20W to N30W withsteep dips to the northeast. Intrusions of quartz parallel tothe fracture trend and some slickensiding and sh~aring are alsoevident. The area is also characterized by a subparallel jointset striking NS-ISW with a shallow to moderate dip to the southwest.It is not known whether this jOlnt set is related to thezone of fracturing or post glacial stress relief.Drillhole PS-2 was located at the top of the powerhouseslope just north of Waterfall Creek and intersected highlyfractured, moderately weathered and occasionally brecciatedrock. It appears that this drill hole encountered fracturedrock possibly related to the fault zone. No trace of this possiblefault could be found to the south of Waterfall Creek,except for occasional irregular quartz veining, because oflimited outcrops but it continues as a linear feature observed··on aerial photographs and is inferred as a fault by the USGS.-The two faults described above were observed over substantialdistances in many outcrops and were seen to be healed withmineralization. Since the most recent igneous activity isreported to be mid-Tertiary or older, these faults are interpretedto be inactive.A third fault, mapped by the USGS but not observed in thefield is located immediately west of the project site. Thefault, believed to be the result of thrusting as well as highangle or strike-slip movement trends north to northwest andforms the contact between the Metlakatla and Sylburn Peninsulasand mainland Annette Island to the west. The last movementalong this fault is believed to have been during later middleTertiary time and the fault is not considered active (Yehle,1977).Engineering GeologyDamsite. Locations of the seven inclined core holesdrilled along the dam axis are shown on the geologic plan andsection, Exhibits A-4 and A-S. The bedrock at the Chester Lakedamsite will provide an adequate foundation and is technicallyfeasible for a properly designed dam. Core drilling along theproposed dam alignment indicates that the bedrock is of sufficientquality and uniformity. Foliation in the bedrock, steeplyA-lO

dipping and trending approximately parallel to the darn axis,does not adversely affect the site. However, the occurrence ofhorizontal to moderately dipping joints (in a downstream direction)under the darn are unfavorable relative to the stability ofa concrete gravity structure. A considerable number of flatlying joints are seen in the drill cores. Many are iron stainedand/or weathered and a few are clay coated. Engineering studiesshow that if low shear strength is assumed along these jointsunacceptable factors of safety against sliding of a gravity darnwill result. .Layouts of arch-gravity and thin arch darns also were evaluated.The stability of the thin arch darn is dependent on theintegrity of the prominent joint set that essentially parallelsthe canyon walls, which must withstand the arching thrust. ~oconfirm the technical feasibility of the thin arch darn, more detailedfield study of these joints would be required.For this report an arch-gravity dam was selected because thepotential stability problems associated with a gravity or thinarch darn would be mitigated. Further geologic mapping of thecritical joint sets during final design studies may indicate thata thin arch dam would be acceptable. .~eathering of the rock mass is generally restricted to withina few inches of the surface with hard and fresh rock exposed inmost places. Some iron staining, caused by the weathering ofchlorite and disseminated pyrite, occurs close to the surface anaalong joints.Water pressure testing in core holes indicates extreme variationin the permeability of the foundation with permeable zonesdeveloped mainly along joints and to a lesser extent along foliationpartings. Rapid and complete loss of drill water circulationoccurred at some depths in all holes at the dam site, with theexception of holes RB-l and RB-2. These losses often occurredwithin 10 feet of the surface and were caused by open, near surfacejointing. Other losses of circulation occurred as deep as54 feet in hole LB-2 and possibly as deep as 76 feet in LB-l.The deep possible loss in LB-l could not be verified however,because of a previous water loss higher in the hole. Waterpressure test calculations in intervals of lost circulationindicate permeability values of 2.5 x 10-3 cm/sec to 4 x 10- 2cm/sec.Water pressure tests performed in intervals of retainedcirculation indicate the general ~rmeability to be considerablyless, ranging from zero to 5 x 10-3 with 65 percent of the resultslower than 1 x 10- 4 cm/sec.A-II

Footage35%11%19%17%18%SUMMARY TABLE OF WATER PRESSURE TEST RESULTSIN INTERVALS OF RETAINED CIRCULATIOt1Range of Permeabilityzeroless than 1 x 10-5 cm/sec. (very low)between 1 x 10-5 and 1 x 10-4 cm/sec.between 1 x 10-4 and 1 x rO- 3 cm/sec.between 1 x 10-3 and 5 x Ib-3 cm/sec.The apparent ground water levels measured in drill holesvary between 30 and 50 feet below the ground surface. The waterlevels rise into the abutments apparently indicating low per~eabilityof the bedrock mass. The level measured in hole LB-lshows the ground water level to be about 9 feet below the presentcreek level. This depth to ground water is most likelycaused by drawdown from the steep gradient of Waterfall Creekdownstream of the present dam axis. It should be noted, however,that water levels measured in drill holes may not allindicate the phreatic surface and could be indicative of thetightness of the drillhole and its capability of holding water • . .Foundation Preparation: All overburden, includingtal us, colI uv ium and detached rock blocks must be excavated froll'the dam foundation area. This should not entail more than amaximum of 5 feet, in one local area of deeper talus along theleft abutment. Generally less than one or two feet will be required.Excavation into bedrock to re~ove closely fracturedrock under the dam has been estimated at about 10 feet. Dentalexcavation and backfilling with concrete will be required inlocal areas of more deeply eroded and weathered surface jointingand foliation zones.Trimming of rock overhangs will be required on steep rock'slope intervals on both abutments. This is especially relevantfor the prominent rock nose on the right abutment, on the steepslopes into the present river gorge on both abutments and on theupper portion of the left abutment. Excavation of these facesshould include approximately 5 feet of rock, measured horizontallyto ensure the removal of more highly fractured rock whichhas been subjected to stress-relief jointing and freeze-thawaction. Careful control of excavation in these areas will berequired to prevent damage to sound foundation rock and to minimizeprevent damage to sound foundation rock and to minimizeblast vibration in excavation areas close to the existing concreteda~.A-12

Grouting and Drainage: It is anticipated that low pressureconsolidation grouting will be required within the dam foundationarea to seal near surface jointing. For estimating purposes,it is recommended that ten feet deep holes be spaced onten feet centers, covering the entire excavated foundation area.The holes will be oriented to intersect the greatest number ofjoints. Split spacing with additional holes will probably followdepending on grout consumption. Caulking will be requiredto control surface leakage.Construction of a single row grout curtain beneath the damwill be necessary to control seepage and reduce water lossesfrom the reservoir. Curtain holes should be inclined upstream.Holes in the curtain will be fanned in areas of topographicchange to reduce the required footage. For estimating purposesit is recommended that primary holes be spaced at 20 feet centers,secondary holes split-spaced at 10 feet centers and closersplit-spacing at 5 feet or less depending upon grout consumption.The average hole depth is estimated at 40 feet withslightly deeper holes in the valley bottom and somewhat shallowerholes on the abutments. The extent of the proposed groutcurtain is shown on the geologic cross-section, Exhibit A-5.A drainage curtain is considered necessary downstream ofthe grout curtain for the entire width of the dam to reduceseepage pressures and control any water that circumvents thegrout A-2l curtain. It is estimated that drain holes should bespaced on 15 feet centers and average 30 feet in length.Reservoir. No areas of instability were noted along thepresent reservoir slopes. Several areas of steep talus do occurbut, because of the low percentage of fine sized materials,their present stability should not be adversely affected by therise in reservoir level. Except for minor sloughing and shallowslides of surficial material, no instability is expected tooccur within the reservoir area following impoundment.The bedrock within the reservoir area will be adequatelywatertight for the proposed reservoir elevation and seepage isexpected to be minimal. The reservoir rims are massive and massrock permeability is estimated to be low based on water tests atthe damsite. No seepage problems have been reported from theexisting dam and no springs were observed downstream of ChesterLake. The assumed fault zone associated with the scarp which isbelieved to cross Chester Lake might be a possible avenue forleakage. However, based on the current high elevation of ChesterLake and the existence of several small ponds along thescarp alignment, the permeability of this feature is not consideredsignificant.A-13

Penstock Route. T·hroughout most of the penstock route,(Exhibit A-l) rock is exposed at the surface or covered by athin veneer of colluvium less than one or two feet deep. Supportlocations will be finalized during tne design phase inorder to minimize the depth of required overburden excavationfor penstock support foundations.Drillhole PS-l was located at elevation 605 feet along theproposed penstock route. The rock quality of support and thrustblock foundations, as revealed in hole PS-l, is considered typicalof most of the penstock route. This drill h01e and geolog icmapping along the penstock route revealed the presence of stressrelief jointing subparallel to the rock slopes. These jointsare open in places and are subject to freeze-thaw conditions. Arecent minor block slide has occurred along these joints belowstation 800 along the existing pipeline route. It is anticipatedthat rock anchorage will be required at the support andthrust block locations to prevent sliding. Anchorage shouldconsist of grouted rock bolts varying in length from 5 to 15feet with longer bolts in areas of steep adjacent slopes, at theriver crossing and above the powerhouse. With adequate anchorage,the bedrock will provide an acceptable foundation for thepenstock. . .Drill hole PS-2, located at the top of the powerhouse slope(elevation 212 feet), intersected highly fractured, moderatelyweathered and occasionally brecciated rock. Small voids andcaving were encountered at depths of 16.5 and 28.5 feet. Thehole was ter~inated at 35.7 feet. Although core quality improvesat depths greater than 20 feet, it appears that thisdrill hole probably encountered a fractured zone over its entirelength.Several areas above the penstock route in the river gorgedownstream of the dam axis will have to be trimmed to removerock overhands which might represent damaging rockfalls. Caremust be taken during construction of the penstock to preventdamage to the existing water supply line where the two are inclose proximity.Powerhouse Foundation and Slope Area. The proposed powerhouselocation is to be founded in bearock on the shoreline andimmediately north of Waterfall Creek (Exhibit A-l). It is locatedat the base of a steep 45° slope which extends upward forsome 200 feet. Bedrock, tentatively identified as foliatedgranodiorite, is exposed throughout the powerhouse area and formost of the slope area above the powerhouse. The upper portionof the slope is covered by a thin mat of vegetation and minorrubble generally less than two feet in depth. At low tidelevels a dissected debris delta is exposed comprised of reworkedA-14

sand, gravel and boulders up to 6 feet in diameter. It is reportedby local residents to result partly from a catastrophic,debris laden melt water release from Chester Lake in the1930's.Drillhole PH-l (elevation 40 ft.) was drilled toward thesouthern end of the proposed powerhouse and oriented approximatelynormal to the rock slope. The existing rock slope isdeveloped subparallel to but flatter than foliation which dipsat 49° to 54° seawards to the west. Surface wea~hering of therock extends to a depth of about 2.5 feet as revealed in thehole PH-I. Iron staining and local slight weathering alongjoints continues to a depth of 30 feet'but evidence of weatheringis generally absent below 16 feet. ' Fractures, orientedapproximately parallel to the rock slope, were observed in thecore. These fractures may represent openings either along foliationpartings or stress-relief joints. This fracturing isclosely spaced within 5 feet of the surface. Below this depththe occurrence of fracturing decreases greatly. From 5.5 to 57feet in depth in hole PH-l jointing is slight to moderatelydeveloped with an average ROD value of 85%. The proposed locationwill provide an adequate foundation for the powerhouse.Slight artesian flow was encountered in PH-l within 5 feet .of the surface and is probably due to near surface water flowalong open jointing. Water pressure testing of hole PH-l revealslow permeability below 10 feet in depth (K = zero to 4 x10- 5 cm/sec), and indicates that jointing is tight.The excavation for the proposed powerhouse consists of anearly vertical cut, 80 feet long, notched into the steep 45°rock slope. The near-vertical cut behind the powerhouse willundercut foliation along its entire length.Anchorage must be provided to support the slope above thepowerhouse. Anchorage should be oriented to provide the optimumsupport for the foliation planes and other steeply dippingjoints. It is estimated that a pattern of grouted rock bol tsand possibly high strength rock anchors should be provided for awidth of 100 feet and a slope distance of 60 feet above thepowerhouse cut. Rock bolts must be provided to support the nearvertical construction cut at the back of the powerhouse. Drainholes should be provided to reduce seepage pressures behind theconstruction cut.Because of the past occurrence of debris laden meltwaterdischarges from Chester Lake and the possibility of futuredebris and minor rock falls, it is recommended that thepowerhouse be designed to deflect such occurrences.A-15

The area south of Waterfall Creek was investigated foralternative locations for the powerhouse. Previousinvestigations discussed in the Definite Project Report voicedconcern over the stability of the talus slope. Our studiesconfirmed that the area is predominantly covered by talus whichincreases considerably in depth to the south. The depth oftalus and configuration of the underlying rock is unknown,although drillhole PH-3 revealed 16 feet of talus and poorerquality of underlying bedrock than in drillhole PH-l to thenorth. Excavation into the talus slope for a powerhousefoundation would create a major stability problem over aconsiderable area. Exposed rock slopes at a number of placesare steeper than the bedrock foliation"and are thus potentiallyunstable as described in the following discussion of the AccessRoad. Finally there is the unfavorable aspect of the seismicloading affecting stability of talus above the powerhouseexcavation. Construction activity for a penstock line acrossthe talus could also disturb the stability and would present aproblem for penstock foundation.The difficulty in maintaining the integrity of the talusslope both during construction and over the long term, the largequantities of talus excavation involved and the extensive ••measures required to stablize steep underlying rock slopes havebeen the major factors influencing our rejection of any possibl~alternative powerhouse locations south of Waterfall Creek.Access Road. A proposed access road to the powerhousewould extend northward along the shore line near the base of anexisting steep slope for approximately 1600 feet from the presentterminus of Walden Point Road. The road would traverse thebase of a thick talus deposit over some 1000 feet of the southernpart of the route. The slope along the northern 600 feet ofthe route is formed by local talus deposits and intermittentbedrock outcrops. The slope is heavily forested except for therock face behind the existing powerhouse.The existing talus slopes, reposing at 35° to 45°, arepresently generally stable as attested by the many vertical treetrunks. Some local areas exhibit creep as evidenced by benttree trunks. Excavating into the talus slopes to create a benchfor the roadway would create a potential for future slides. Amassive slide in the thick talus deposit would close the roadfor a long period while cleanup proceeded and, in addition,could undermine and rupture the existing water supply pipelinewhich traverses the talus high on the slope.In places where bedrock is exposed along the 600 feet longnorthernmost reach of the proposed road, the configuration ofthe rock slope conforms roughly to the foliation which dipsA-16

about 50° to the west. Mass wasting has undercut foliation overa portion of the rock fate behind the existing powerhouse andlocally at other outcrops where overhanging rock blocks remain.For the most part the existing rock slope appears stable. Excavatinga roadcut into the rock slope would undercut foliationnecessitating extensive stabilization measures similar to thosedescribed above for the powerhouse excavation.For the reasons given it is recommended that the accessroad be constructed as a fill section throughout ~nd that anyborrow operations or any other construction activity, whichwould cut into the existing slopes be ,voided.construction MaterialsThere appear to be no easily exploitable sources of naturalconcrete aggregate in the area of the damsite. Several sizeableaccumulations of large, blocky talus, a glacial moraine and analluvial fan occur around the lake but these areas are inaccessibleexcept by boat or by blasting a haul road. The closest ofthese deposits is a large talus deposit located approximately800 feet north-east of the damsite along the western shore ofChester Lake. Borrowing from this presently stable talus could •cause potential instability during later impounding of the reservoiror seismic loading.The most accessible potential source of aggregate near thedamsite would appear to be to open a bedrock quarry operationlocated on the left abutment several hundred feet upstream ofthe proposed axis. A quarry in this area would require minimalhaul distance to the damsite and would not create instabilityafter reservoir impoundment. Since the quarry site rock is thesame unit as that at the damsite, petrographic examination ofcore samples from the damsite drilling will be carried out as apreliminary check of the acceptability of the rock for concreteaggregate.There are two existing bedrock quarries on Metlakatla Peninsulaalong Airport Road approximately 1.S and 4.0 miles fromthe end of Walden Point Road. Both quarries are in moderatelyfresh, moderately fractured interbedded meta-greywacke and metasiltstone.Neither quarry is in operation at present but materialfrom one or both of these quarries was accepted for filland riprap in the Metlakala boat harbor after appropriate testingby the Corps of Engineers. The Corps of Engineers did notperform concrete aggregate acceptibility tests on this material.Estimated in place rock volumes are large.Metasedimentary rock appearing similar to that in the twoexisting quarries is exposed in a roadcut near the end of WaldenA-17

Point Road. A quarry could be opened in the northern end of thesmall hill adjacent to the roadcut which would reduce greatlythe haul distance to the project site. One unfavorable fact;rof a quarry operation in this location, however, is the closeproximity of the present water treatment plant on top of thehill. A quarry in this area will provide sufficient quantitiesfor the necessary concrete aggregate. Further studies duringdesign phase are required to prove whether sufficient quantitycan be obtained for use as fill and riprap.Bag samples of material representative of the two existingquarries and the roadcut have been collected. These sampleswill be available during design phase for petrographic examinationand appropriate laboratory tests to evaluate the metasedimentaryrock for use as aggregate and riprap.Beach gravels along the southern shore of Port Chester andalluvial gravels in the stream valley extending south from theend of Walden Point Road were noted but were not otherwise investigatedor sampled. Either of these would require ratherextensive sampling and testing if tRey were to be considered asa source of concrete aggregate. Problems of exploitation wouldbe faced at both sources because the beach deposits are subje~t·to daily tidal flooding and the stream deposits are covered byheavy forest vegetation and are probably underlain by a shallow9roun~water table. Therefore, neither of these sources is consideredto be a viable alternative to the potential rock quarrysources at this time.A-18

I~III !II IgoMo~..M--- ~~W77: IEXHIBIT A - 1,---.... , /I II IIIIIIIj,IEXHIBI1 A-4N 120,7000, '\':) / ,( (IIIIIILEGENDTHRUST FAULTUPPER BLOCKSAWTEETH ON\PS-2•DRILLHOLESCAL,_ ,,_400 FEETE o 200 I

EXHIBIT A - 2••. -----..L_.--:~InferredRi,h-enele fault or other 11ne_ent••• • A'Thruat fault; aavteeth on upper platela, b23456791011121314151617Queen Charlotte faultTrana1t1on faultCh1cha,of-laranof faultFairweather faultChu,ach-St. El1a. faultChatna. Strait faultLynn Canal faultChi1kat Il1ver faultDuke River faultTotachunde faultSbakwak Valley faultDeDa11 faultSandap1t faultClarence Strait 11n .... nteoaat lan,e 11n .... ntSitka faultFron Yehle (1977)Scale 0IScale 05050100100150 Ki lorn.etersI150 MilesALASKA POWER AUTHOR ITYMETLAKATLA POWER AND LIGHTCHESTER LAKE HYDROELECTRIC PROJECTHARZA ENGINEERING COMPANYDECEMBER 19B1REGIONAL FAULTS

EXHIBIT A - 3SHEET 1 OF 4• •.........95'. j.... ,i.••• . .../ect Locationc; .............aQ§aiJ,~~'P"a. ·~------------------------~----------~--~--~~~--~~~--.-~~'­.-••••• ," ...'. ~'. )C'. D' •• ~' .. Ill'" IlID·.la' .. 16.12"" .. 1 .... 1 .... u-. ... Id.)1 ;.. . =O~DRAOO~i-:-·'£Lca.-I.;....... .,iA&.A8KA fIOWE .. AUT'HORITYIlETLAKAT1.A ~ .. /lIMO LIGHTDEC8IIIeE" ,.,EPICENTER ~OTS

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I_lI IIIIIIIIII(COOROlll"TE DATAtAI..ASItA STA7E PUo.!'OE ZONE I)STATION I\IOR,HING [ASTINC ElEVATI0f4D ... ~l 120 71 ~ 0.0) ]1)2714.99 'H'l."0.. ...-2 12075'i4.20 llJH1O.H 9"10.891 1201160.0 lIlHH.2 lJ':IO.l2 1207391.2..11)2"').~ IRO .1J 12074'4. Q 1112964.7 'I2L}La I 1207100.11 11)21".9 8H.8L. loA 110?1'J't.J J1 1UH!. 7 847 .4L. 2 1207146.6 1111I1U.1 871.4L8 J 110710!>.J 11'1141.9 907.7+" t.~07~OO( l,ll ~ .1~O'#0CHESTER LAKEEXISTING CONCRETE DAM\ '-- _.~NIUCDlOitrill" ~u'ld Dip ot JoLnt. and.Joint s.tsSt..rik." And Dlp ot rol1~u.lonV.rd..cal !oUatlon,",,11'1 accWIIl.Ilatlon ot' Tahll I.1I.dColluv\\lZII '5 ft .• ax. lIIO.tl~O. S-l ft. Co-po •• d ot' •• nd. 9u.ve1."d boo.Ilchr.. .R8y• Iftclln~ Dr111 !tole1. c.oloqlc _?pL:'I~ ?'I'rt':::.r.-d dl.lrl.n'iKovlII~r and ~c.I"!.r,..: 19.12. ror •• ctlon ... - .... • _ I.xIHblt A-'oEXHIBIT ... -~IIIIIIHARZA ENGINEERING COf.4PANY DECEf.4BER 1981ALASKA POWER AUTHORITY~ETLAKATLA POWER AND LIGHTCHESTER LAKE HYDROELECTRIC PROJECTDAMSITE GEOLOGIC PLAN

-!:' I \ Legeru: EXHIBIT A - 5~"q-o.........~t I1 ~:l ( nor.: :::,.,.:. ~; •;~xhi hi 't A - " _

ANNEX A

HARZA ENGINEERING COMPANYGEOLOGIC LOGForm SG-2September 1978 PROJECT ••••••• c.A.~~.f.1.'!:. ... t.9!-.f.~ ... __ ._1$..19 ·8Hole No ••••• '.~.:J ... ~ ....... _.... Angle (from Horizontatl_ •••• b.Q.~._ ••.•.... Ground Eln.tion •••••• :tSi7ShettNo 2-DIte .JJtZ921?.... 7 •.....•....Feature •• J.f.f.i .. ~~.!. .. !1~.'~... Baring •••••••••••••••• ~~J.1; ............. Rock Elnabon ......... ?~./'" t; ......,...,J. c • .r~ 10,5" q.-Qa. ....:- :.:.? - /'( -Cf r--"0· -."0 ci._.t· -"+--,/:(,~ 7"- S.. ~ .. -- - ' - -0- r -l~ ~ ~, .~£... ; ,. "1 :'r- - r-... V) -~-"4.)- , ..[,~.1)0 ") d,..1" ....... -- - - --;- f-' (t~;O'.~-- 251.3 -8 - --I•I -,r'....';J{r- It,., ~$ -:".) to-3 't;.~-~~r- V- I/S ct..I.,. () -u,/'~ 10.;: ~./ ~; cl.. l ."r-d.~~ +""c.+;11 tis sl.d~.,< ~c.r- 32.0I,-Il-I' .,'- 3'3.0 - / -(,0' (t.t ..,. , .7(l cL.r-.jl. 3 ... k'tI, -- / /,~o e L ',," ~ -J,I, 4 S CI , wi'~,,,10' . -~o·~ )~l" ~. I .. S~&: ...-1- ~" 1' ..... ('C.'I.G.,' .... 1.. 1 ~,ct.~ ty .c:nLC.~, ~ ~ -~ - -V- Of!;)'~I.lc, ...V 3".0 - :5~.q--.$1,.y I()~ 70 lo(/o t4' ....~i'J -iif--< >.t.,~~-~--It ~ K,Zo I. 0,.. ~ ~ }..i~ ~\ .. J~' loss - O"IJ~r R~f"J~~L.c~~• '{AI"~~,C/ ios.: IV,,,,J. ().--:- ~ 'f.'sI--~~ '0· tf s+., .... lIc iel SeN C- Q II;.v;- ~-~ft /") . e '-ft S 4"., -+0 110 .... '0/\\ """,- .r- -:;(I.~ l qtl~--

HARZA ENGINEERING COMPANYGEOLOGIC LOGForm SG-2 / tSeptember 1978 PROJECT •••• C.A.~.~/e.": ... .r./! .•• ~ ..••..• .!.~.rJ· 13Hole No ••• __ .I::..~.;~.-r, ....... -.... Antle (from Horizont.l) ••••• b.Q.':.. ......... Ground Eleyation ••••••• 7..9.?~.1.. ........ .F.-ure ••• '".d.t._~~.!:...Al.!1.... a.rint •• ~.~ ••••••••• ~l.~f .. --..... -.... -... Roctc Eleynion ._ ••••• _.~~.c. ......... .Coordlna_: N •• Z;~Q~k!l.~ •.• t.. o.te Started •••••• -'4I/I.~t) f._............. Overburden Thidc."'-a •••• Q.:.O" •••••••••••E .~ .. _!~. r.1{.~1.._ .. o.te Compl.-d ••• /j./..'I. .1.e ...........•.. Ground-Wner Elevation .~.K'~?·1 ..... .Core SlIM ••• .z:.,;:.~ .. ~ G..,l. •••••• Toul Depth ••••••••• §: :.7. ............... Logpd by ••••••••• .Djl.t~'I-.......... .Grephiclotia-HIcation II'Id Ph.,.., ConditionR .... rkl(S.mple 0 .... Wl1er Leyel ••Drilling Owec1llrirtics etc.)-- /. () ...'7 _... 2$------ -0.0 • 0 "'r '1/4.,' Grl1ti ..Rc.

Harza Englneerl~gForm SG-IsCompanyREPORT OF WATER PRESSURE TESTINGPROJECT C nO t~y- /.4. ~~ 1$~-~""' .3 XI~ ....IV .N C IV ...""' IV til 0'1 I0 ..... IVTest .t::, ... - .~ til E of .... E c:0 e ........ ~~ ~ ...... 0.- IV (,j e· .... ........No. From To ~ ... IV Start Ene IV ""' 0'1 til ,~ IV Loss ... ::::I NetIV ....~ 0'1 + ..... I-C'" ......... ..... E U 0...0fft. IV.... til~::::I I t.l .... - -0 .... (pSl)oJ CJ ~ U (gpm)

.1HARZA ENGINEERING COMPANY GEOLOGIC LOG Sheet No. ,;,' ~Form SG-2IDlte •• ~~(.~7.ti~September 1978PROJECT •••• ~!1.!.i.t!*..r:..J.9.t:~ ...... !.l1.'-;.aHole No •••• /:..4.~.J ........... -.... Angle (from HorizonUiIl •••••• i.a..~ ....... .~ng ••••••••••••••••••••,.7:••••••••••••••" •••••••••••••••••••••• ~e SUI~ ••••••••• .L!.{jfJ.1[~ ••••••••••••Feature •• ~.~1.:t:.~~.~...........~~inatel:..1 iCore Sizn •••• ~-'If.. .. J...~J1.g;; ___ ToUI Depth ••-•••••• ..s.'-~.7......._.. __._._E •••••••• ?~ ••••••••••• o.te Completed •••••• jJJ."t./.1.~ •••••••• _._.GrlP.dcLot~fJ j a..ifiQtion Md Physical CondItionJ~WI -~'20(.P--A c\".lo'.I~II- ~~ t='o\:4t-J. 6~d:Gr,l. (~ G-bo~~)~ V 4$~ 2- cU.,~ ~,...-clI-I~ ~o ,LI.a..$Ii~kr- ~o· cl~.~~1/~. ~.~: ...-~ / ~. d..( ...~ lI~. 5 -'r .", ~id,I~,..1- S\~tP- ,..,. 10' c~( ...tl-I-,/ 1(0 S u: .. ~"I"~/ If,;,'" TO'. Ct. ...w '-Ta;... ·"'I-I---' 30' cL..r.,~V, ,'/0· ,t..( .....I-I,.t-il o' ~I..~I-C.~I-~ ~ 'TO' ~IaT~ct. ....~ .:. !'5:i.~ ~t .."",I- $/0- ,...cl. .-.-P-,~-'cI l7o~ icJ., ....~ ~ ~. ~\...,-.l- I ......... ~~. ~ ,t-" 10' "1 ......,/ ~ .-,... r-- ~ JIJ" ~.-'-r-~~" ~ c:.~\_.,/J,'I-V ~s' je\..I ....r-"'P-- V ~.~i~~I- ,- ~ ..r- I; CIJ· CJ,.C-..s'llI, C. SV.,.Ground EI ... tion .. u.u1;ic~"'!u""""Rock EI."etion ••••••••••• ••••••••••••••Overburden Thick ........ ~!.? ......._..Ground-Weter EI."lti,; •• __ •••••• _ •••• __ •Logg.d by ------{J.~-.-.. :t-.. --.---... -.-t at.II at.R ..... rksQc5 II: (Simple DIUI, Wlter unll,Ia: j 0 II: Drilling ~rlCUriltics ttc.)cJ,- - I~ -~0~ -~- ---~~I~"-.. - ------~ - ----~WL J1-M If 1"/17 ~-- - -o~I~ -b: -I~- ---/..OISS .-(2 O.s'

HARZA ENGINEERING COMPANYForm SG-2September 1978GEOLOGIC LOGSheet No . • 1.-::.1 __Dlrte .J.L.;~.~.'}PROJECT .--c.!r..~_?x:_t.f.!._!.~ _____ 1J..'l.?::!$.._Hoi. No ••_______ £_~.;_?. _____.._.. __ Angl. (from HorizonUl" .-_.__ bo._~ ________ Ground EI"ltion •••••'!l!..'L ..._...._._FelltUnt .(.:;£.i_fA.t.d••_I:.I!.!J____ ••• Barinl .-.-...----.---,~.:;.~J.~--.--...--.-. Rack EI.v.tion ••••••• ~~ ••••••_•••_Coordil\l1lll: N ••.I+l.P_!;_?'fi..'... om Started •••••--•• .Lt.;,.t.'i~I.......__... Overburden Thickneu ••••• 0.\.0. •.••••••••E •• ~ .. Jli ..:r~...J•••_ om CompteUd •••-_//-lll/-rl.. ___•.__••. Ground-Wet ... EI"ltion '";JI..Z?~...':f•• __._.Cor. SiZ81 ... 1_.~2 ... tt.B.G.J.._._. __ Totlll o.pth --____•• ___ 6.a.~~--------_---- Logged by ____• __ .~JA... t:O:¥_-•.•. -••-.11:-.2 -5Ie!..... -GrephicLogOuIiflcltion end PhysiClI CondidanRemarkl(SIImpt. D_, Waur Lev.ls,Drillinl et.,-=-riniCi etc.'~0.3Ī-2 l­I­l­I-li~l­I­i-~ l­i­i-Z.Zq,J -iOO~ lV • ../~. luti'j e ~, - .- -- - - ---- - - ---""6 l-I­....i-)1-l­I­i-'2 I-...l­i..!'.[ I-i­l­i-;~ I- If..·.'­IĪ-'1-i...... 11'1,:")_i..f. ~~ ... ,;.'-.O.O-7,~ C'O~\'1 ~c~.~~ t>1e.C.-

- --~.~Hole No. ~g- 3Location krt. t. t /~. tREPORT OF WATER PRESSURE TESTINGPROJECT as -I.e".- 'kf~ /.5'(9-£ -.Angle (from Vertical) 50 0 Ground Elevat~o:i(10 2,]s..tl M ~rf/,~ ~ ) Bearing 2. 3.2 0 Rock ElevationCoordinates: N Date Started II {3.. Zy!. Water depth dur~ng test D~E Date Completed II '/1 /'t'J Logged by D If fn':j......Depth -., Meter III I1l -PressureI........ Ili 1IlC"o I1l Ili, .... s 'f ~ ....Ili .1"\1 C III Test .J:. .... - • Ili III e of .... e c 0 E .....,~'O \.0 ., ., Co- lli (j E .... \.0 ....No. From To 'Z., Ili Start Ene tV ........ I1l Ili LossC"tIl' - ::l ., tV ....+ I Net-c ..... .,:;;- .... E I1l 0"- - u . ft. o . Q"..QIll ... til~ u, I .... ~ .lj ~ ~I ... ..J u- (psi)QJ(gpm)E-•'0 c Rate'I1l >-m. E- c..5 ~~ 52 I'" .4 1,5 C.~,"." -• ~,j\.0--un~ts~ c, 12..0 r 5.G- ,'1D 17 12.. i(S' 12, I ),/0-'1r ,', '" ..( (,,,~ - L'rl'

"',HARZA ENGINEERING COMPANYForm SG-2September 1978GEOLOGIC LOGPROJECT •• £1..~.-6Jt: .. I.~.!:"':-. ...... !.J..f..f..:{]' •..Sheet No. J/.s..Date .///.iiZ.rr...Hole No· •••••• t..8.:z.. f.. /G.7 ... Angle (from Horizontal) .•• o.£.q.: ......... Ground Ele.,8tion ••••••• ~lL':! ......... .FeatUre •• '".~.f.t... ~ .........,.s.... Baring .••·••••••••••.?l~.................. Rock Ele.,8tion .••••••••• S.~.-:t! •..•.•.••Coordinltel: N •••••••••••••••••••••• o.te Started ••;•••'if.;.!L............... o.erburden Thick". • ••••••• ad,i .........E •••••••••••••••••••••• o.te Compllrtftl ••••'!/.I.J/..7.L.............. Ground-Water Ele.,ltion ••••••••••••••••.•Core Sizes ••••• k!t:! ..... l&.Q'J...... Total Depth •••••••••• A:Q .• Q............... Logged by ••••••••••••• P.JA~£':.!:t ........~~Grephic,~c:_ Log,9 fi1 'tf.'tf. Remarks1; Q, >- • oil¥ Q.. aS'.. a .. ifiCltion and Physical Condition c:I a:: (Sample Data, Watar Le.,el.,~.Ie! c:I i a , ! a:: Drilling ~recuriltics etc.)"'- '! a: c3:J c (J(, ,.FoI~-I-.d1./ ~ .:,,~. G~I~"l+" eel" .~~"4 \sl~\..+'..., F-=ac +" .,..J, -~-~ ~ ~

Form SG-2Sept.mber 1978PROJECT •• £U.!.S.i:tr. .. t.C!..!.'..IJ.. .... i.$.i.'7. .. :tiHoi. No ••••••• f.t3.:?: .........._.... Angl. {from Ho,itonuU ••••••• 45?: ....•.•••• Ground EI.vftion •••••••'[l1..'t. ..........F.ature .fe&... ~.t. .... ~~~ ... a..ring •••••••••••••••• Z.~.'2~ .........!... Rock EI.vltion •••••• Si.t!.!t .............Coordina.: N •••••••••••••••••••••• Data Sun.d ••••••••••• U 'II 111............ Overburden Thick ...........Q..~•••••••••E ••••••••• ZCor. Sitn ••_• ..rI1.~............... e.u Compl.ted ••••••• I! j}lT.~ ..•. _....... Ground-Wlter EI.vation ••••••••••••••••••£.Q..).. •••• Totll Depth •••••••••••• -'.O.:.Q ••••••••••••• Loggld by •••••••••••• ..1Jl~.;,£!'!.Y. •• _ •...GraphicJc_ Lot1fl1fl Ramarks'j is jr • Qa-iflcation and fIt1YJica1 Condition(Slmpl. DIU. W ..., L.vels.,;! I JIII:S = Drilling a.rlCtllrinics etc.)"'- 'f! a:i cu~r ... f".,JJ "'·It\fo\~W 6~d:""~4 (Q.\ Q 1,.,,,.'I- -~V t,o' ~',. "!V·:s "'1. \.. \-''1 ~ fOe -' ...Nf.c(t~ ·0 ; I, t,#. ,\"I---I-"":' .,r ~ ~ -~ / ;..,; .. .- ;" , ~~\ls.;..; " ·~I- "- ""-(\,.1,:

HARZA ENGINEERING COMPANYForm SG-2September 1978GEOLOGIC LOGPROJECT ••••• ~i!!~.i.~ .. f.q.f.~ .._.... L.J.1:J::~.Sheet No . . ;j~ ..Olte •••••• __ ._ •.Hole No •••• I:.P-.::!iJ"'C"""""" Angle (from Horizontal) ••••• b~.~ .......... Ground ElevRion •••••• ~~.~~~ •• _•• _••••_Fe.wre ••!:.dt.. ~ ... IrJ(.!L._ "rin, .•••••••••••••• .Qj~~7.:••••••••••••• Roc:tc Elevltion •••••••••• ~~ •• __ ••• __ _Coordin._: N •• .l.".l.~.~l9..9.·.1••. OI1e Stlrted -•••••••••!;JJ.'If.Ti....•••....• Overburden Thicknes • •••••••• ~:R ........E •• ~j.l~~.1.CJJ~ .• , •••. DIU Completed •••••• !!/.~!/.fL...........Ground-W.ter Elevltion •••• 1.1.~~., ••••••••Core Siz ....... ~.~~ ••••• c.5..Q:j. ... ToUl Depth ••••••••••• .5k..l: ............. Logged by _ ••• __ • __ ._P.!A::fl!y... ______ _Grlphicc_ Log.g oS• Q,:10 •~Q..,-1.7 •~~ .1.5If ~~~..S.7 -b "--~~~/"". ~ 10.0--- --~~~I--c'- ~ .,."Iop~a .. iflcetlon end PhysiClI ConditionRemerkl(SImple DIU!, WlUr uvel.,Drilling O\I!rlC1ariltica etc.)- -/0010 11,0 'os~ ~ 2.7_I..J:. ~ a /C." 1 fie; ,:1. :-·f _CQsed. '_-.. -100% ~ ~ ton ~ So,. -'-~1 ,,/fJl1 i~

Harza Englneerlng Companyform SG-IsREPORT OF WATER PRESSURE TESTINGPROJECT C~ € .,.f~.,.. t~K ...Date 12./9/7]i. ...I ." .,Hole NO.~. __-=~____ ~ _____Loeatlon /.~f-f&u.t b '\ j,f'pCoordinates: : ~~~~z:.~oJDepth -, 0 .... -- il)Test ~ - 'il)Angle (from Vertieal)_ ..... -....;::..:.,.'_Bearing~ ~ 7 'Date Started JZ )ifr 'Date Completed 111,1/.,;....,

:;HARZA ENGINEERING COMPANYForm SG-2Septlmber 1978GEOLOGIC LOGPROJECT •••• h.{l!~.:&.c..~~.g:~ ...... ~llJ::!1Sheet No. I/.£.Date •• U/..!/.rL.HoII No •••••!:~-:t....... 1! ... 2 .... Angle (from Horizontal) •••••••• 9.:~.: ....... Ground EII •.uon •••••• .1.~.~~f..........FI8tUrt •• J:..ft.f.f..~ ..... dl!.!.s.. Baring •••••••••••••••• Qf?.OZ ......."...... Rock Elevation •••••••••• ~ •••••••••••COOrdi .... : N ' •••••••••••••••••••••• Date Stamd •••••••••• !!,(.~~ 'AI ........... Overburden Thick,.. ••••••• 9~.9 ....... _.E ••••••••••• ?:; •••.•.• Date Completed •••• JILI..I/..l!........... Ground-Wet. Elevation iT-•• ~ ••••••••••Corl Sias •••• J.~l .... ~.~j.... T01aI Depth ••••••••••• $~!~............. Logged by ••••••••• _ ••• flD..r.r.!.Y-..... .Grtphictc_ LogaI.2 -5 aI R.nwks; i~ ~ II:JaI aII:1AoI- Drilling aw.c.rilticll1C.)·S a:cJ ~i j J a..HIc.tion Md Physical Condition Q (Sempll 0 ... Water L ... II.a c1/ ~ Sl,~~I..Po-,iqo ell-. ';;J,~-f~d G,~~dcQrI~- I---" -~S J, 9A -t/y Froc Iv ,.~J

HARZA ENGINEERING COMPANYForm SG-2Septlmber 1978GEOLOGIC LOGPROJECT -----(t!..~-Y..f!:._J..!.k.:~ ______ t_Jl_f::!lSheet No . .$L£_Date __ a/..!/.tL_Hoi. No •• ---!:~--:t-------K---;r---Future __ J:._ft_f.i_~ _____ C!7.!'s. Baring .---~-----------Q}?-olZ------------- Rock EllYmon •_________ ~ __________ CoordiMtel: N .______________________ Date Started __________ ~I..!,-~Y.. 'AI___________ Oy.rburden Thicknen _______ Q~_9 _________Angl. (fro,,! Horizontal) ________ ~~_: _______ Ground EIIYation _______ 7..~_~·_f _________ _E ----------"7:;------- Dati Compllted -____ /1.!L~I_-l~-----------Ground-Water EIeYation iT---2'.----------Corl Sizes _____ +-!f:l ____ '...Q.t;J ____ ToUl! Depth ___________ :s~;J: _____________ Logged by ---__________ .!ILt_r.!::!_'f-_____ _Grephicc_ LogI tc.2 -5 itc Remarlu; ~ c:) II: (Sempl. 0 .., Water LIyeI.,fJ j a..ification Ind Phyuc.1 Condition.. Q..J! Q..,- I.:I II:'! Drilling a.racuriltiClI1C.)II::J C cJ~- J-1/ ~ Sl.~'t...,- V I4'v ~i-, ~Jr~-f~d G 'aA'I~ dcOf"l~-~ ~ ..esh';/..f/y Froc -fv ;-~eI

HARZA ENGINEERING COMPANYGEOLOGIC LOGForm SG-2September 1978 PROJECT •• {;.Y..~.te.r: .. i:9..f! .... !.~.t"'-.:.~ ...Sheet No, drDita •• a-J..i~:r..'.HoII No •••••••• t:.~::/............... Angle (from Horizontal) •••••• ,.a.~......... Ground EII"ation ••••••••• ~:t~.:r ....... .Fe..,'1 .J=!'.:f:t •• ~.f.. ... b.~.'.-"".Baring ••••••••••••••• QL?;;;............. Rock EII"ation •••••••• ~.~ •••••••••••CoordiNlw: N •••••••••••••••••••••• Date Star1ed •••••••• L~;;.!.t{./-1:! ........... O'Ierburden Thick.,.. •••••••• a .... Q ••••••••E ••••••••••• ?:, ....... Date CompttUd ••• .l!.I.tp./.tL........... Ground-Water EI..,ation ••••••••••••••••••Core Siz ...... ..IM. ..... ~.wQl ... Total Depth •••••••••• Z.2.:.$: •••••••••••••• Logged by •••••••••••• ..ad}.I.E~.y. ..... .Gr.phicc_ Log.2 -Sl~ atRlfMl'kIra..ific:ation .,dj 1Phy_'.. ¥= ConditionQQ.a a:: (Sempte Dtta, W.~r LI"el.,.II! I, !a""- :Ia:: Drilling ONIrtctariatia Itc.).. '! a:: d:.J a c cJ.. ~/I~-/.Ie1 r;~dIGr'+J G.~ Q t:..,,~ 3.7(ort I.s:.r~~ ~_~_I'1 ~- ) sI.w..u. ~ dll'4 +- I, .... ~;.., 0-\ ("0.-;.. ISoil. ,..r., I... . a..1~1i\ C1. ~ 1- @? ~klV -«Z.S-T CJ, '12.S--~I- -'""..~ -- -- -~ -~ -..... -... -..... -~~ -~ ..... ~ I- ~ -I ,-'""" r- -~ . -r-.... -- -..... ---- -- -- -- -~ -~

HARZA ENGINEERING COMPANYForm SG-2September 1978liEOLUlilC LUliPROJECT ••_C.~.~t':._~_f......_.._LJ.7.J..:;(l..Sheet No . • 7'.1..£0 .... !?.,aLCI..Hoi. No •• ---t..#..-7..-----L,----;r---.. - An .... (from Horizontal) •• ____ ~t)_~ ______ ._. Ground EI.wl'tion ••• -.-••• 1..'1.J...:t ....... .F • .,,. .A~.fd ___ ~.'S,. __ .a./..i~ .. Baring •• --••••••••••• Q~z.:.7. .... -...... -. Rock Eln8tion ••••••• -?~~ ............ .Coordi,...: N ._ •• _ •• ___ ••••••• __ ._. o.u s-ted ••••••••• l/~I-/r./.IJ.. ........•• cmrburden ThickMil ••••••• Q".9 ••••••••••E •••••••••••••••••••••• o.te Completed •• _._.U 'L~/I.t ...... _..... Grouncl-W ...... Elnl'tion ••••••••••••••••••ear. $i_ ._...I.tt-J!. ..... -a~.) ... - ToUi Depth •••••••••• ?I..$: ••••••••••••••• Logged by •• __ ••• _ •• .D.~.l.E~.y. ........ .G,.phicJLog ~i ~RlftWkaQa-iflcation .. d PhyMal CondItion(Sempl. 0 .., W.ur LeW.II,IC£ Drilling O\8rec111rinica etc.)cJ&.1-Iii0.Ie!w- 'e a:f J 1c,FoI(lI~~ Grr:;tvII 0 c;.. ,~1.dto",,:.f~·- · wi, , --I·S/'f "·lIy f' ro. ~ .f~/ ~l ,L.~. t1 S l1o-hd ".0-77. o. ~ ~ -.. n·f!,,! Jl ,c.,c# p-I -0 ~-~~~~" -- -- '-So- .""'41ta. . -~ -- -~. o~.- / Fe ,t~I"-.J $1.''-1:- /~oC' ....'..",/ CJ( ct.10"'.~ ~C- ~ -

Harza Englneerlng Companyform SG-IsHole No. L.. t3 -ILocation ifff &...1 A-,./J 7J",,~~Coordinates: N------E _____ _DepthREPORT OF WATER PRESSURE TESTINGPROJECT Ck2S&f- kf. 137tt-Q-Rock Elevation S~~ .Water depth during test • 7SLogged by /J, A! ~¥-..... '" Q)0- Q)~ ......c;:;-TestNo. From To"'Q)OO0' '" Q)Lft.=c'"Ill.... Ul.... IIIm. E-StartMeterAngle (from Vertical) 3Q~Bear ing ____..lo..O..}/(•. ~ S' [C;,oC)"3 .~o "J.n...7. ( "to , c:"t10.-'''' , t. :: ~14.1s" Ii: .1.SI1:.Z5 Z ff)D1, , 4 ( £. .O-g-, .O~; '!" ~ 5"~ -'. , ! ': ~,I,/1 In/v;Ground Elevatio:18',,'1PressureIRate'~----'------r-----'r-----1", >-c Q)ofc 0e. ....e .... '"w...;LosS-:l '"Net.:J .....+ I c..; Q,.Q- -(gpml0 ....u w (psi)units2,702. 73SQ?W1.' 7101050so'3 QZoLa27.1.1.. ::... --7. ''1 Cf· 7~\ Z.QYCf·7ro {( ~"2, !i/1. ~ '" I ~ ,cr S- , 2.DC{ 20 S.S 411- 12. 'r' X fo-'llIi. T 10.35, 3.L~ qo{0.3 S I ~.(.£.. t~L~' !olo Zs. 7 ~o ~o.7 2..7'- 10-'1',ra.UL' '~.~ l.31- 1./0 I~t37 (0 .z.~ , 1 .. 97 2.010 z~ I'Z . ( S \ t .~7 7-0 IIt 1~ l~.'O , I ~.s ,"0 S,O ~3.7 Z.Z)'/o·4'1I1II\Jepth tCl grou:;d",ate:- .__ feet X O.433= __ psi Gage + Column - Frictlon :"oss=:--let ?re55~:-* C:=l..l1'1!1 press·..lre = (depth to middle of tested interval £!. depth to groundwater, ·.... hl::.eve:- 10,5~a':"~~r) X (D.433)-':-:Jr.ve!":;10n facto!'"s; :=u,ft.X 7.48=gallons2kg/cm X l4.22=psimeters X 3.28=feet liters X O.264=gallons

:1a~ ""a ....... '"! ...... t;.t;. .. _ •• ..,Form 5G-:sREPORT OF WATER PRESSURE TESTINGPROJF..CT Ci4!sl-lr ~ fA 13Z9-ilJa te ;;. ;-, If?)Hole No. L 8-1 Angle (from Verucal) .30 0 Ground E I € vat iO:1._---'l!'-'c{L..!i,~ . .!!.,f__Rock Eleva1:ion $'~.Location).,f{ /3tw t A) " (R, -v) Bearing N I Z ~Coordinates: N l20~ ;oo.r Date Started I'/157ftE I!: ~".'i' Date Completed II/"L'flDepth ;..l Meter en taI---"T--..... '0 .... ~ ......--.......---l en ~I c:Ill.... .9 "1 ~ al ....Test .!: ;:. - • en Ii;..l~_ ,oj~ c,.-... ..., ....... ,ojNo. From To O';..l ~ Start Enci ~.''''! ~::: c: ;..l ,oj ~ .... 1 tol Ii-"I ~t.. ~ .... e-~ ~ u 1 'e:....Water depth during test ____ __Logged by/) J1 ,rr-i 'tPressureRate'~--~--~--~~-~ofc:c:Ii..... oLoss- :;,.- ;..l+ ....o' ..!.. uNet.....(gpm)u(psi)ur.l ts~~~~~--~--~-~~-+----+-~~~~~~~~--~--d~~---+~~~I ~ t.f 10 '-I.b c.O //·0 I S,(j' r ~ 2. L ~ 0 III £,(,X/O-z........~IIII >­Il.I ;..le .•......::; .Q...Qz. ;, l'f,"f IC." 7"1.0 /0~ 8 1/)._. ~ . ~.5' 'l"(( q. ~ JO11. Z. 7.0 10)? 7 7.0 10'7. (.. ~o,o 47·S. .~ Il., if

HARZA ENGINEERING COMPANYForm SG-2September 1978GEOLOGIC LOGPROJECT ___ C.A-!l~/..4..C __ 4K~ _______ !..!.f.7. ___ BoShftt No. ?.L:: _Date __ f?-.l.71!HoII No •• -----f..-t5it~------;r------ An~e (from Horizontal) _______ f'-:f __________Rock Elewation •_________ ~ _________ _Fe8tUrl _"'_-r_f.-{__ J:,!Y:_~ _____ 4~!_~ __ a.lring .--------------L:~~-~-l-----------Coordinlta: N ______________________ o.te StIIrted __________ iJ.J.Jjl _fL _______Owerburd .... Thicknesl ________ tt!g _________E ___________ /",,; ________ Date Completed • _____ iJl'.!..] _'-1.. _______ _Core SiZH _____ .z:d~ _____ ~a) ____ Tout Depth __ • ____ • _____ ~.'iL ____________ _Ground Ellvation • _______ tr.c._ ~ _. _. ___ ._Ground-Water EIIWation _. ______ • ________ _Logged by ____________ !J~J1i7:._~_\f.---..-20~~~ o.bo~).22. ~ f- ~\.Io .... -LfGrephicrI 1 CluaifiCltion and "'vlic.1 Condition - I 01:_ Lot i~ ~.2 -5Remarkl'; Q. Cl) ~ (Semple Dna, Wattr Levlll,J!O• • I •1 a: 0&'-I-Drilling ChIIrlCt8ri sties etc.)'e -~c3:J < cJ[( ,.- '0· c:.~lo~~~ .....'+...~1~c.Ic.-~;1t.od-f - S/1 ~ ./.('f +;0 C +u .,.J: -Fo~d f4e1 G,t::aAA..O d(c;ol+~ -~ -~ -r-~ / ~. c~IG" ~ ~ ~!/ Iu< .... C~IcW'i~ft'4AO~10'-~.(14" .. -~ ~ is\· ...-~\., -fd ... I~.,-11 1 0~~1;- SL...-""" -~"'·('(Q·r.~-0r- 30>1='I~~ -.. ~\ ..... -r- ~ ~. cl.t--. -~ Zt'f.1~(. O. 2.1. I-- --- -~-"- -- I~- .--- -r- -~ -r- -~ -r- -~ -~ -~ -r- -Col-

n""ML"" t: ... u, ... t:CM' ... U ... vmr"''''' U~VL.VU''''' L.VUForm SG-2Sept.mber 1978Hoi. No._ ••• ~&.:I..,g-... KF.8tUr. _k.f!f.f. .. .&~ ..... LtV.~PROJECT __ c..!..~_~t~r: __ I.~!..i .. __.(m.:!J____.~'-l r'U~. '6-Date --J.0?iJ'.•.. 7"' ••• Angl. (from HorizonQII ___ ••••• ~.$:.: ..... _. Ground EI •• 8tion ___ •• $.~7_~_ ..• _._. ___ .Baring •• -•••••••••_•• LlS.~~.r ........-- Rock EI •• 8tion •• _•••••• ~~.- ••••••••CoordiMu.: N •• .I+z..Q.7,."'.1~_. OR. SUrted ._••••• _•• JJ.j/.l~.r/ ......_.. O¥erburden Thick". • ••_•••• 9.~.f.)_._. ____.E _.~4..!.i~+~'~.l ___. Dau Compfmd ••••••• £l.j.LJ./-Y.( •••••••••• Ground-W.t.r EI ••• 1iong ... t>.r.:t.? •••••••Cor. Sizn •••••• J;.tr/. ....'-Ba.J... Tow Depth •••••••••••• k.9.1~ .••_.._.••••• Logged by •••••••••••••••,.tL.&.¥.......c_.2 ii1; Q,Je!IU-Gr.phicLota-ifiC8tion and Phylical ConditionR.rMru(Sempf. D.a. W.ter L ••• I.,Drilling CNrec:terirtic. etc. I- 0'-z _ I,~ -~~~/..f~ 3.r/00'0 Lo SS@ / S -.- - ---..~"-.. -----..~, "-~- 1,0-~'t--r-'0 _ 9.1~I-- 24-.51. ':.t.i.?nJ«/;/~- ..- - -~()L CJSS ZAr- -~,,~~...-'f/ ....- - -16 - --.s\~l~ !recc.~c.. \1'1· 12..~,------..-- ..'1--~~ (1,5-j~----~--~~~----------------------------------~~~~~------------------- ..- -

~21./(,!"10 f-.'zNIf..IfHARZA ENGINEERING COMPANYForm SG-2September 1978PROJECT ••••GEOLOGIC LOGc;:..f.~).t.(!i':. . .I.{l.I.:..tj ................. .Hole ,., ..•••• 5..$.:; ........ -.r .••... Angle (from Horizontal) •••••• ~Q.: ........ .Fe..,re .Rjf;Jli . .M.~t. .. L:rl.!.S... Buring •••••••••••••••• Qj.~.:r ........... .Coordinatn: N •• .Jr.~~?.o'.!.t(~.~. Date Started ••••••••• 11./.~9.L~! .......... .E • .;1:All~+~!-!i ... Om Completed •••• .lll?-.LLTL .......... .Core Siz" •••••• r. ... ~l ...... ~ .. J .. Total Depth ••••••••••• '-9.~.Q ......•....••.Graptlicc_ Log..,.Sheet No. 1/::'.Date. Llj'ZI. fl.Ground Elevation ••••••• .!l.CL ........ .Rock Elevation ••••••• .s-~.~ ........... .Overburden Thicknesl •••••• Q~.O ..•..•..•.Ground-Water Elevation •••• JJ.£·.t ... .Logged by •••••••••• .iJ.~6J..£i:~Y-....... ..2 -S • .a ¥ ..,. Remarlu~ClaIIiflcation and PhysiCilI Conditiono.1 Q. g-o.Q.Ie!~ a I I! C.. o.t" =(Semple Data, Water Levell,"'-] '! Iic3 =Drilling Q\arK1ltriltiCi etc.).." J.- 0.0-'0.0 t;,1'd+«f /6", ,.oJ,o~;_/' ~ .... eL.. rJ.-I- - ".~ 1r~~'~t. 1"~ I "'~d'l.. I 60 ~~; ... 7"/~ J li/,d"qit.. r ~,.II~I +. "~ lIS c U~-~0.- 0~Q~ -fo:J I. 0-0.- /.' - I 7o~ ~.~ \a~ .. ca-r •. ~o"'i.+·iJt... ~",.,I,....J by ~,.--... c~.fra. +.~ s 0 -I c'I.,.+. --'-0I~-~G~1. S-lri"'f"~. "/~'fIO} 1of'L)r.rlI.I.~ -~ t::.A /~;-~c ¥ "";",,,, 0;.+;.J, .. C- Sls+o , ... "- -- q,1 t- '0' $_t4." S~ ~ft.",·'1 ""I F~ S-Io,;" .'.~oj"e --~-~o· .!>I~i .. · Q 4tot, ) -11 ~ ~Sy IJ,/P) ,; (,a. flf'\-..~~/r't (/tit ~ fl.,,, . ~ .. ~c~f.t ...~-t~f~Y.;" . ~ -IV)()..-- .'lo' I"" ~\. 6.0-/2.c. .,/ {J~ ~~'"- 1-4',,"11..,. It_' ~y Gt'l"1. IJ~.II ;".1".........-I1: ;J6>'O /I. I 40 .c. t ICO +'G'""""" L 7e'" Ckl~ -~};(,.~... -/ bQ" ..-~'"~ r-c:a". r ... !lot!.f .(' r/Q c. ~J( , ~d (S.()-~.3 ,. - . -to- Y fi

"~I I Q'REPORT OF WATER PRESSURE TESTINGPROJECT CJ§t~r fa f~ (!tj9-iJHole No. Lt?_IAL.J. r 0Angle (from Vertical) _..!../...::!")~_ Ground Eleva tl.O:'l ll'l7, L.IBearing I TSo Rock Elevacion 5~LocationJ.~t l5~t .1­~ ..e...Ie- .......::.I ..0.-'"unltsr.!..7S ",",1-' .-.... . .... '. ~59 .-~ r4.7t.f., '"' '/"7, L..z.".7~10luI~'0I~..10IQ10It:cDept.h to g:=-ound· ..·ate:=- .__ feet X O.433= __ psi Gage + Column - Frictlon Loss=Net ?:ess,,::* C::Jl'.lMr. oressure -= (depth to mlddle of tested interval ££ depth to groundwater, .... hl::-:e·/erSMa 11 e r) X (0.433)":onverSlon factors: ::u;ft.X 7.48=qallonsmeters X 3.28=feet2kg/em X l4.22~psillters X O.264=gallons

--... ........ ----. .-.- r'nu..Jc \,., I .. J......-;:!!' :.-:! ..... ",'"... ~ ......... , .. ~ f" ... ~ ... _......... ~ .. '=""-' .. " ... _",I;-!'....Hoi. No ..},- ;{'.d:-. .$.•..•........_•..•F •.wr. A(.'ft.b..!f ... A-..l-'.~ ..•~rdin.tII. N ••••••••••••••••••••••E ••••••••• r .. ~;.t\ •••••Cor. Sizes ••__ ~Xi±!.---LBlJI-)-...•~ 0 /""Angl. (from Horizontal) ••••••• ~.9 ........... Ground EI.Yltion ••.•••••• 1.?L~ .........a..ring ••••••••••••••••• o,.,;?~~ ........ __ ... Roctc Elewetion m ..... S~ ......... ..on. StII"ed •••••••••• H/~~9.. .fl....._..... Owerburden Thicknesl •••••••• aI.Q •.•... _.Det. Completed .•_•• a~.I:.{ .Cl.._....._.._Ground-Weter EI.w.1jon 1r••,.•.••••..•....Toul D.pth •••_••••••• ~.Q.Q ......••..•.• Lowed by ••_•••__.JJ".a_'-c.':.':.Y-•••••••••Grlpnic .!!lIf.1:_ L~lIf..j oS RemlrklI ¥• a- > • .a Claaiflation .nd PtlyliCiI Condition Q (Slmpl. DItII, Wltllr L.w.II,S'.. ~ :. . a:~~ I 0~Q] !ia: Drilling ~rlCUriltiCi etc.)"'- .. ·Sa: 8:J a cu"" ~liA.f.

). "~~ ~~ -~1 ~,. --c~11lV ". s,.cJL~ 3(..0 -~-)Form SG-2s.ptember 1978Hole No," ••• -'!-.~::.~.l .....PROJECT •••• cj!:.~:ifY... .. /.~.t.~ ....... {J.27.::Pr .. ,. ... Angle (from Horizontall ••••••• ~.9.: ......... Ground Ele .. tion •••••••• i.?L~ ........ .F •.tur. J:!$.h:L.~ ...•• 4}!J.'i.. Buring ' ••••••••••••• .r~1.~.~~.............Coordin.w: N •••••••••••••••••••••• 0.1:. Started •••••••••• a/.~Rock Elftftion •••••••• ~.~.~ •••••••••••••rI........... Owerburden Thick". • •••••• Q •.• 9.. ••••••••••E ••••••••••• r ......... Date Compleud ••••--'I/....,U. '1:1............ Ground-W.ter El.ydon •••• r ............Cor. Sizn ••••..J.h.~.... r..J!.~j... ToU! Depth ••••••••••• i2·.Q.............. Logged by •••••••••••• lJdLI.r.!.'I- .........1 i; Q.i!!Gr.phicLotI~¥ ~ Retnllrklj 0I I J a..ification .... d Physical Condition c3 a: Q (S.mpI. Dm, W.ter Llnl.,c"'- ·S a:a: Drilling ~rKUriltiCi .tc.)~ r.1:a+~ G~d~"",~. (E1. • bD"f') -. r~,-~- -- zz., / '0 I='cS ..... -~ -/ ~; -t0ol--~o'-~ -~/1 ,,' Cll.w Q"'~~ Ii ftal r~\... . -I~ -~ .reI. ~ -~~ ~ -"" ... ~ ..... \:)~ 100'0 H; Okfi .. e ! 7't~I '0' O~, ;:~~I';'"~~ cIa., -I- I ~ ~~'-T~.--~ 1: ~L.I .... ~ ~I.I.I'- A~ II/zir' _~~s !tL. -~/ 75' Cl..f ,a,," -~~ IsI.sl"k. -t-/ \'n ~. c I..,to--.;32.1 •I..:' )1·SLtC. -l-I ,d eft..Tl 10.-..... , . ~ .... ~ ~ -. C Q~ -~~ -~~ ~I-1'· Ii' L. /..."IcJ~~ -0 0~ -......-

HARZA ENGINEERING COMPANYForm SG-2September 1978GEOLOGIC LOGPROJECT •••• c.!..~.f.~r. .. k~.k..~ ...... (.1 .. 1..2::.(lSheet No. Il.~.Dm .J)../J./ILHole No ••••• .l..8.:.?-. .,r ....... A": ••• Angle (from HorizonUl) •••••••• Z!-?~ ••••••• Ground E11Y.uon •••••••• n~~! ........ .Futun ••• R.~~~:I:. .. .J)~.t..../:tV.\ a.ring •••••••••••••••• ~!.r.;.............. Rock El .. ation •••••••• ~.~ •••••••••••••Coordin.-: N .7.l~]"..l~!~~.... Ode Started ••••••••• fll.~JiXL.......... Oftrburden Thick ........ 12·.9.. .•••••••.•E •• ~~l}];.~,.!'!J. .. ~ ..... DatI Completed ••••• iL/.?tl:lL........... Ground-Wit., El .. lItion ••••• ~.~L~ ...... .Core $ius •••• ..J:ff.!-••• ~Qtll.... Totlll Depth ••••••••••• ft,.O ... O.............. Logged by ••••••••• i2db£C1.Y. •...•.•....- --2.-~~-.J i• CL1e!.... -33 -'f - 3."- , - -~GraphicLogf .. )·1 · ~:oJ ~0.0 - 'O.C f="o\'a·ht&6~ad\Q""+4'L.:'i\..~ -flt.ed '~. __ I'L.. ,\lfGy ) Mctiq 't'Cl ~".~ f

Ha~za ~~glneerlng ~omFdny?"ocn 5G- I SREPORT OF WATER PRESSURE TESTINGPROJECT cA~sJ.u: l~fe 1399-13•Hole No. R/! -.l Angle (from Vertical) .rO Ground Elevation,Location CIR It ~ I- &...t A:_l'~,~L) Bearing OIL Rocl< Eleva1:10n ~J:ICoordinates: N lIZO! 1J..c/1l. ~ Date Started IJ/2onl Water depth during test :!:30E.3: 13Z:!",Z Date Completed ' II / l./ /'r / Logged by r),;1,"~ 'C.- - Depth J.J Meter til "1:1 -Pressure.... t:JI0 .... 111tIl~ 'tl C Rate· "1:1 >-"1:1 ....S ~111 ..... .NC t:J J.JTest ~>- • 111 en e of ..... e C0 e ....J.J~'tl \.oJ.JJ.J 0..- 111 (., e. ..... \.0-From To Start Ene: 111 ......... "1:1 111 o-en ........ _.:I ~No. 0' J.J 111 Loss Net ...."1:1 0- +I~ ~cCJ.J J.J ..... .... E U- - - ....,Lft.111 ... til "1:1:1 , til ....." .t1~, u0 .....(psi)..l 111 3 (,), (gpm) \.0E-o «m. c... --E-o 'cl.r111:S-f 2.4 14 / /., I. D'I I. I '\ I O . .6q /0In 1./ ~ 01 1 0.0 10 3.2.- - /3. 'l. C,Q2 J 3 ~ Z2.tl '£.t.. LO .1.0 2. 0·0 fa f(~ 7L£L LO 2. (j"O U !'·7 - Z'.7 O.D!L 2..1.~ 32J lQ."- j~./ Jt..Cf I'S10 /t'fj ~)(! I'! t) v J..I 0 L,,

HARZA ENGINEERING COMPANYForm SG-2Septlmber 1978GEOLOGIC LOGPROJECT •••• C.I..~.-t.~r: .. t.~.k!t ......{.l.. 1..1..:(fSheet No ..!/..3...Den .J)..,l;]IL.HoII No •••• ~.8.:.?"!j" ...... A •••• Angle Ifrom Horizontat) •••••••• ZQ.~ ....... Ground EIIy8tion ••••••• :!.~~~! ........ .FI.u.re ••• j •• ~~~:I:. .. .J)M'.t..LtV.~ ..,ing .................. ~!.r.;.............. Rock EIIY~ion •••••••• ~.~ •••••••••••••CoordiMtel: N .?:.z~],..~.~L~ .... Dati StItUd ••••••••• LLL~~iX1 ..•..••..... CMrburden Thick.,. ••• ' •• ~'.9.. ............ .E •• :-!rl}J:~,.!'f,#f. .• ~ •••• Date Completed ••••• 1L/.?t.l.fL ........... Ground-W~" EllYnion ••••• ~.~L' ...... .Corl Siza •••• .J:r.r;!-••• J-QW •••• ToUi Depth ............ J..;_~·.J.O ............... Logged by ••••••••• ~,t!J£~.y. .......... .I.f ~~~~, ~~.......!-c_.2 51; Q..Ie!"'-J.q~.S--/0 -..--2_-~r-/1.1 ~r­~~i-...~(,i-ii­I­/ i" " ..... tl.., .. ~f.i,,"/qJIII,7oJ~~t.lo.r,. ~",

Harza E~g:~eeri~gFor:n SG-Is~omFa~yREPORT OF WATER PRESSURE TESTINGPROJECT CA~S~,. ia.fe 1399-8•Hole No. PI! -.l Angle (from Vertical) .10 Ground Elevation,R I &.t A: o CJLocation It~ .f._~I~I~I.) Bearing '/2.. Rock Eleva~ion J;}Coord~ na tes: N I) 2 0 7, t{C(I.I. u Date Started "/2oRJ Water depth during test :t.5 0E .3 I 13Z t1,Q.Z Date Completed f 1//2.1/.,1 Logged by tJ, If, ,..~ '(.,- - Depth ~ Meter til ~-Pressure.... IlJ til 0'1I0- 4~c c; .....Test ,.c>- • Q) til E of ....-E c 0 E ....... ~", 1.1 ...... 0..- Q)E. ....'"...No. From To 0' ... Q) Start Ene: Q) ........ ~0'1 til ,Q) Loss... :::I Net:J ...~ '0'1 + -. Icc~ ... ;;-UIl...:l- E'" t1 - -~I 0 ....Q) ... tilLft.~ U1 I WJ .... (gpm) c.; (psi).... Q)1.1m. E-o•~E-o ---unitsI 2.4 ~4' /J.' J Dil I,~ I O.O'J ID/, I ~ Ll"L .01 1 0,0 /0 3.~ - /3. "L C 07_ / 3 ~ 2'.4 G 1.0 1.0 2. 0·0 If) 1r.7I. ~ 1.0 2.. ~ .. O lAJ ~,7 - Z',7 o l'lif 2 /~ .~2.1 I{),L I~, I Ii.. ? ( ,~lQ I-fj ~)(i~ 0 If J.-I 0 L ,,.LPl .iI 2.'2.7S" 2 !".~~" .f'~ZS! JlJ. tt I" '1.S- z..~ 'f I!~ 0 7~ ? 7.0 .! 7.0 2. o.c 10 12.,~-" .,. a ~2 0 2- O.C LO 3"L. o CJ. .,7:1 ,...~ J( It) IS 5' ~.9,1/o-Jb 3S.'1 SI IS.' 7.~S , J.~ I J,.l(~ If) ~ "rIC.g,B 19.Q('.f 101'1.t:t LS '75' I ,.o~ Ie:> 1/,:) I3.S ~ 1. 1 )10-3'A1..(1.C( Sf. L." '.0 '.0 1.. 0.0 I~ 2r.,S'9.S T...~ 2- 0.0 ~o I/. S 4/.S 0.07 4'9.'1 60 £0.& LCf z..~ 2- 0.0 20 Jr.!,~.37 3,3' 1 0.0 ~o I I, r 51. ~ 0,0 ,~epth tC'l g:-ound· .. at.e=._ feet. X O.433-__ psi Gage + Column - Fr~ction Loss=:~et ?ress·..;.re• ':;::l'..:r.:i pressure = (depth to middle of tested interval £E. depth to groundwater, ·.. r.:::-:e':er .=sr.1al:er) X (C.433)"::x',ve~SLJn fa~,:o;s; ::u,ft.x 7.48z gallons2 .kg/em X 14.22aps~meters X 3.28=feet llters X O.264=gallons

0HARZA ENGINEERING COMPANYForm SG-2September 1978GEOLOGIC LOGPROJECT ••• c;!~?~.t::. .. ~~j~ ...... !.~?.r.=1$Hole No •••• LE.~!. .......... J.-.... Angle (from Horizontal) ••••••• Zg.~ ........ Ground Elevftion •••••••• ~~~.~ •••••••••Fe8tUre .K''iJt.~t. .... !T~./~ •• Baring ••• ~ •••••••••••• Q.9.~.;' ............ Roctc Elevation .•••••• ~ •••••••••••••Coordi~:N ••• ~?.9..7".~.'E~.~ .. [)Me StIImd ••••••••••• tLi,¥~Tf .......... Overburden Thick ......... Q... 9. ••.......•E ••• ~ .. J.l_2.~.!1!:_~._ Date Completed ••••••• .!I.ii-..7.;...ft......... Ground-Wet. EI .. ftion ~ ••• Il~Ll .... .Core SiUl •••• .,J;.M. ... L.8.l4.1 •.• ToUl Depth ••••••••••• ~ ... 9. .••..•..••.••• logged by •• _ •••••••• (Z!a~E~¥-....... .GrepflicLogi l/lj l/l.1 i; Q,f a..iftation end Ptlysicel Condition1c3 Q,Ie!JI"'-•I 0c:i c3Remarlu(Sample D8ta. We.r Lavell.J .. a: Drilling Chareeteristic:s dC.):S cJ- / ,.. ' f:

Harza Engl~eer~ngform SG-IsComFanjHole NO. __..;..R~B_·_Z~___Location II; 1+ ' .... rAt ,~Coordinates: N ,, 2.07 , '''(.2E .3 1~1.'4~{"-REPORT OF WATER PRESSURE TESTINGPROJECT cl1~J-I.. ~ k f4. Iff'! ."Sr.ee: ~,: I::late----Angle (from Vertical) ZlJo Ground Elevation_~j?~~_O_.~I ___Bearing ________ O~/u~~a--~---Rock Eleva~ion 5~Date started ____ ~/~4~/~Z~~~!~r~/-- Water depth durlng test Dry, .Date Completed JI /lS' 1 TIr- , Logged by f), ./I ~'/.-.....Depth ... Meter til ",.- Pressure..... .~10 ..... ~tII~S ~ " C Rate' ", >-~ ..... ... (II .N C !;; Test .1:. ... - • (II til E of ... E C 0 e ....",'"... ~" ... 0..- ~ . c.. E . .- ;::I' .- ...-No. From To ~ ... (II Start Ene: (II ........ ", ~ Loss C'tII'... Net~ .-", 0'1 + ..... 1Uc...Q-C'" ... ' ..... ..... E~ .... tilLft.- - 0 ",;::1 I tW ..." ~ ~Iu...(psi)...l ~(gpm) ...3 WIE-o «m. E- c... --: ~ ·.lr.l tsI #, 7 n,J 11, '.7 .ZH, /.JB /0"1~ '1.t.!, /.~7 '01.1r IJ,,~2, I,~ 7 10 3 7 2.s 1/. "L .s.7xIO'4'2 12.. 'I 2.3 10.6 ~ ·~I ~ .VI( I l'l.o"\ 10? .

( ,HARZA ENGINEERING COMPANYForm SG-2September 1978GEOLOGIC LOGPROJECT ••••• !:..!..

Form SG-2September 1978PROJECT ___ t:.~:t..~'!: __ b.t.~ _______ !_~_"t:r_:g..,.,-.. " ·.v. 'r--=-.-~"''''Om _I.U.z/.~J.(JHoi. No •• ",.-J~-~-:j-_-~-----L:..-------An .. (from Horizontal) _______ ?Q~ _________ Ground EI •• won _____ ~~~~ ___________ _Rock Ele..uon • ________ ~_"'f?. __________ _Fe8tUrt _!-_L~j._t___ ~_t-.. __ ~_~~ ____ Baring •_______________ RfXJ~O--------------CoordiMUl: N' ______________________ 0.. Shrtld ---------I/lre'-'- _f/____________ Owerburden Thick,.. ________ ~t9. ________E .p---------Tl'---'(,----- o.te Completed _____ I.LI_~J. _1~_____________ Ground-Wftlt' Elftl1ion ----------.-------Core Sizes _____*:i.tI.'-----.a:.G.;----- To~ o."th ___________ ~ .._Q. ______________ Logged by _____________ Ii.!jJ_·_~!"!?+-------GraphicJc_ Log#.,2 -S#. RIftWIu¥..:J c U1; ~rI 1 a-ification and Physical Condition a:Q(Simple Oltt, W.ter Lnell,J! I",,-1 '! a:a: Drilling Q\ar..:t.riltics etc.)~ ~.

HARZA ENGINEERING COMPANYForm SG-2September 1978GEOLOGIC LOGPROJECT •• _ ••• k.6.tf.~.~.~. __ !...c...& .. _Hole No __ .~_ •• f.~_:~ ... ____ ._ .. _._ .. _ Angle (from Horizontal) ._ ••• _ ••• 7.9_~ •••••••Fenure .J:. '!'!ll.i.~.t.K. __ .. ___ .. __ .. Burin ... ______ • ___ ••• _._{-j_~_;..;-.. _. ___ .. __Coordinates: N •• ~_kR7+~?~ ... ~.-- Dete Stamd .-•••••••• t? ... 4:f,.l~ ... -.--...E -A"-'19.£ 7 k'~i--.--- o.te Completed ••__ ••_a..Jj _1:1. ____••••_.Cote Sizes •___ Z ___ ~_._ .. C_Q_t.__ Tota Depth •••••••••_.l$.. ... ___...•.••.•_._.. Ll.9.1-8Ground Eleyetion " __ '-?_!~"'~""""""R~ Elewn~ ._._~'!!!!~._.........._..Ow.burden Thickneu ___._•• Q~.Q •••• _•.•_Ground-Wnw Elewa1ion _.e.~t .. :'~_: ..~ by • _____ • ___ ~~_~c.;_~_ ••.•••..•c_.2 -5I!Il0l-Gr.pflicLogRemarkl(Slimple Dfta, Weur Leyell,Drillin .. ~rKtariltiClI1C.)C~----~--~~~----------------------------------~~~--~~~~------~----~I ,P,.., r tV 1'""'0 s..atP a f _l­

Harza E~gl~eerlngForm 'sG-Is:::a:.eI-'_REPORT OF WATER PRESSURE TESTINGPROJECT ('k~v,k r~!-Iole No.f~-ILocation pcwS t.,tAngle (from Vertical) ZO°Bearing ______ ~/.2~/ O~r_------__Ground Elevation---'=O~~w~~L~ __ __Rock Eleva't:ion ~ ~,Coordinates: N 1.2.07.3 I 1·7. , Date Started IZJ, /rz Water depth dUfjrin? 1-~st ~ryE 3 lSI 7sC/.' Date Completed Illt Irl Logged by A., ~~ I I"" -J --I- - PressureDepth ... Meter Ul I1l -~ .... S )Cj ~ QJ.Test ,;:,""'- 'QJ Ul E of .... E I::No. From To S'... QJ Start Ene: QJ ........ I1l QJ O"rtlLossI... ·N-I:: QJ 0 e ....:::l+" -' ... t:; ....I Net- 0 '-.l o...Q.... (pSi).... QJ UlO"0- QJ-I::'"..... E I1l 0"QJ....X ft.rtl ... 11l:1 '- I -oJ c.J .... QJ 3 U(gpm) '" ~~Iu loco-- m. Eo- 1units'0 I:: Rate' I1l >-... ~'O loco ...... 0..- QJ :., e. .... ..--- Eo- .. u.. -----I ?'tI IS ID. {., if. 01 , .'2. I 2.&.1 '0f~, I~f f{ 0 C.1.1 7.'11 I 279 '("j, ,) 0:-~ 3 t ~ q.~1 /l. If ( ~.lO fO 32. S ~.L 7.ll'a~. .I1IJIji I;I~epth trl g!'ound;.-ate!' .___ feet X O.433= ___ psi Gage + Column - Frlctlon Loss=~'e:. ?ress·..;,r.:=• :cL.lr..n pressure -= (depth to mlddle of tested interv.ll £!. depth to groundwater, w:-1l::;e':er ~s::-:a::er) X (0.';33)-":c::-,ver:51:Jn facto~s;:u.ft.x 7.48=gallonsmeters X 3.28=feet2kg/cm X 14.22=pSlliters X O.264=gallons

Ha~za E~g~~ee~lng Companyform SG-IsREPORT OF WATER PRESSURE TESTINGPROJECTa@5/~r kfe /5?~-tSS:-:ee::Lo: IJa te /Z/u--:;;-Hole No.ff-2.Location ~(A:" -luI' I( .Coord~nates: N~. "ZE '3. I ~.;; I' 9 ,I•-'I-Angle (from ZO OVertical}~~~ __Bearing 123 CIDate Started (2../£ IT!Date Completed.....Depth ... Meter til ~ -/ iJ!/YII..... iii I:Jl0"0 ..... ::.Jo 1t:Jl'0 C Rate'~ >.~ ..... ..J .. QJ.... .t'\jC QJ ....C0 E .~e .... ........:::I ,oJ QJ ....Net~ 0" + ..... I-C,oJ ,oJ ...... ..... e u c....QQJ _ Ul~:::I I "'-l .... - -(gpm) " ~ ~Iu0 .....(psi)..J QJ 3 U.1run~tsTest .t::.""- 'QJ Ul e of ... e,oJ~'O .. ,oJ ,oJ 0.- QJ (,jNo. From To ;r,oJ QJ Start Ene. QJ ......... ~ QJ Loss O"Ul'~ft.Ground Elevation 2. Il.S'Rock Elevat:ion S'eut ~Water depth during test _________ _Logged byPressure/J.1t tw:;im. e- e- .. c... -----1 3.l. 2DJf 17,' /. c,y ZIt) j S.?' 107.10 1.5,00 I s.9 I&J/3.00 Ir. 71 / ~ll/ /f..J 1(. { /2,:;- 2.0 ~. '{,(IO·'L 2. 1.'1 37.~ I~.r. 2.m:>

·c"At1~A tNYINttt1INy \,;UMP'AN TForm 5G-2September 1978uCULUUl1.. LUuPROJECT •••• (!.~.~.!.~t:"...jP...!.li ....... .!3.i.'1..8..:>neet NO .• -:-:'.~.Detl.:-Y..)/.t! ••Hole No ••" •• ~.-.~ ••••••••••••••••• Angle (from Horizontal) •••••••?

HARZA ENGINEERING COMPANYForm SG-2Sept.mber 1978GEOLOGIC LOGPROJECT ••• cj~~/:.~~ .. ~.~.t~ .....!.';'7.9..:/3.Hoi. Nto ••• r...~:t. ............._.... Angl. (from Horizonwl ••••••••••••••••••••• 70°Feature •• f.~.':}.~~: .!................~n, ...."........... l.1f.l.: ..............~ StIrttd ••••••••• i.;t'ItCJr.l. •••••••••••••Coordirwta: N' •.l~~£1~lJJJ1....E .J..~1~',1~~

or:n SG-:sREPORT OF WATER PRESSURE TESTINGPROJECT CAf!.J~V" /4 t., 13~t;-B ojHole No. t E -I Angle (from Vertical) 20 Ground Ele:vatio:i '?'~. 3Locatlon .SO S'. t.f, ~.I'·:Ii)"""I--m. Eo< '.lnlts~'f V.~O t Z.~L /0~S3 /I 1." I l.Jrf (0II·ZY 13.C;S" I Z.71 I~ 2 f ~,S" J/.7 SX/o·"2- \ 2. 'f 1..."- ISo,," '#~~ j,,-. ," \ 0 . .3 10.'.Iq '\5'0 I 0,11 {Q(",10 fD s~ 1 0.4'( L~c.. ~~ (7 0'. o 'It( 20 ..7. 'I CJ 7, ,1: I b.2~ /0) '-, 7., 'i 1o· L"Ie.> ~,I- /~ I J.sxru~.~ 2"'" 4'~ 'S.'-.. '. ......1")( I,lh L ... ~ '7.7 ~.7(J 'f.,c u ~. ! IS- Lc~ . t. \ .., q·10, S.c. IS' /-,roo \1 c.4 7 1 ,1.4{,'" 7.0 12. '- 'U/D-'12..q 0 7.70 I '1.~ 307.7 () 12. I I ~.4 ~Q12... \ II. S ( '1,g, -'fQ / '-f 1- ~,::; ~~ ,2..,!q ~. (., I 0.7 1.

HARZA ENGINEERING COMPANY GEOLOGIC LOG Sheet No.1ii..Date !.~........Form SG-2September 1978PROJECT •• c.~.~.-&..~.!.~~ ........ .!.~.f.7...:tfHole No ••• ;;;-..f.H::L............... Angle (from Horizontal) ••••••••• :t£~ ..... .Fe.wr • •• f9.~l:l:!I ... :e............ Bearing •••• - •••••••••• O.l~'7',r ........... .Coordinatlt: N •••••••••••••••••••••• om. Started •••.•••••• L+/.$t.$L ....... .E •••••••• Tt •..•'\.•.•••• o.t. Campletad .•••••• L.~/.!J.I.:(j ....••.•.Core Sizes ••• 7.J±~ .... J.Jj~.) ....... Total Depth •••••••••,s..l..• Q ••••••••••••••••Ground Elevation ••••••• ~'!.'.? .......... .Rode Elevation .•••••• .?~~ ........... .Owerburden Thick".. ••••••• Q:.Z ••••••• _.Ground-Water Eleyati~ rl~' JJf. r.f: U 1'. rLogged by •••••••••• {.(~.t;J.~fut .•••.••••2c~2.2 I-1:_.2 -SGraphicLot- ..'I ~f ; .. a..ification end Physical Conditian'!Q • •:I i a.... - 'e:J IA cI-, ,'2~~l- .' iJD· tJ..t ...r.~ati i atR..".rklc" a::Q (Sample Data, Water Leyel.,I Ca:: Drilling Q\arac:teriltics etc.)a:cJc!--~ I~ -~ ~ -~- ----~2 ,(-- ~. IJ"~ c\../o".,~41·cL.lo~.0- 2'/.S - / ,~ t~·,L.I"l-~.~0--,.. to.....10"*" 7~: 15 ~"7$,.\ S,-,,..p,~ ~.s" V. p.III"27.0 -.30,0 C(Ol.(.." ~c.(. 4(.".."~f Q1L 1.1, ...-..~ ~ j J..;.. 7S· j ts ~. pol., ~~"'1. S sf.de, vI PU""'@ ,..·H. .,.\JoooO- '/ ~ZS' ~~~.'I ~ sc,:h. 0 { ,f~, 70 - 7~ ~ S'C "'~.,.,.... Q.,.'\.~ ~o' (j'rp,s" I.e k·f{. 1f.." lifo sJ ~ rO('OS"-J. '-'-~ ,."..,. v. .f ~ f~.bl'7 ...... +~d. S"l,~"-tf~ro l \, "~) ,,' ¥,r-P'~. ~.,- 30.0·tf ~,/- -::-- , -.,.-.. /-.. ' I, L..~. a:,itr~~1.I~t- / fso· ! ........ ~-, .- ..~., , (,l .~l. .'~\~/. t-~ ~" ....~y ~. c.11.., to\ ~ 0.-' (0'41- ~..4~ ~ "..a c~.~~~~~~? "·cl..~r" •.l:J 0 ~""l ....~ :'1;"1... -- ~ ~CI-Cl "'" V, -" -So.w-rl.30.0 'Jt3 .•- - -- ------~ N -eI~ -~- - ------~I- Jq.b -10'1'P'f~

)2IHARZA ENGINEERING COMPANYForm SG-2GEOLOGIC LOGSeptember 1978 PROJECT ••• {;/~~.f:~r: .. lfi../.$ ..... {s..r..'? .. :..~ ...Sheet No. ~:..3 ..Olte ./.LL· ••••••Hole ,.,.••• ~/~I.L:.C ......._...._.... Angle (from Horizontal) ••••••••• ~~ •••••• Ground Ele.~on •••••• ~.t7. ............Feature •• .r.~.~ __ "':.Y.i!:.>.~~!.. ••••••••••• Bearing •••••••••••••• ;~r~;;........ ....... Rock Ele.ation •••••• ~.~ ••••••••••••Coordinltes: N .1~1..9.1,.Cf.l.1~1 ••••• o.te StlirtH ••••••• I.~ .. ~.fl. ............ Ow_burden Thicknesl ••••• ~~? ••..... ~ •..E •• ~.I.(J.q~~~i.J: ... Date Completed ••• .!.l".i.~f+.'r.L......._... Ground-Wlter Ele.atlon .$LAr.i.~i!!=.C-.Core Sizes •••••_.Z'..d.c•..••. U~). Totlll Depth ••••••_••• D~9.. ........._ ..•._ L.o9ged by ••••••• ~Ad"':t:!~ .....---.....it.Ie!GrlphicLog ~i ~R .... 1ua..iflation IfId Phyaial Condition c:J a: Q (Semple DIta, War Le.ell,I CIa: Drilling OirllCt8riltica etc..)f j iI"'- '! a!:J i c cJi~- f, ~~. ~~0.0 - .$7. 0 Fo/I.fJ 6'~OA ~o~f'I+qr.s.t.: ... , ~ -~ N?.... 0 fiLs+.l_ . V...na~' • ,~- C;~ +~ ~""'Illf 'i"V Q~- ..;:::. ,.... I" ~ ...... +'!'- foN'.f~.~s.~;tQ of.;..../. 'i ~ ~...,\.."\{-",~- Il.c (.- ~~t. ... \~ ~~ -I"'~"""""~ . -~ I- ~'5I ...,.. ~(. i,,~(" 1'!;.~-lI.01 ~~ -~4 ~ ~S ...... ~ ... --::..~~~ 0+ _I-..., 110· rl)c..t +~ z..s ~< 'i f'a. .....~.~,", I . f.lu. '" !fe" .....J. , , ...... ,;.., .~ E' Ie.., ,.)~~ .......~ ~. \lO ti 'IoCQ(...ro. +~ SI •ortL.. .. ~~.el{~. -.-i. ?

Harza E~glneerlng~or:nSG-!S:ompanyREPORT OF WATER PRESSURE TESTINGPROJECT (fter/.!l~ k.t.e J~79-lJ::::-.ee':. /:;: /~ / ~ --:-;::,:iaee I t:-/ ! I "3'/Hole No. ,Pd-/Angle (from Vertical) ~Sf) Ground Elevation 31. 7Location ?t1A.~t JIovr~ Bearing 07SaRock Elevacion l?7Coordinates: N I.Z-0Z.!.' Z Z Date Started Il./q/?/ Water depth dunng testSI!4r+' .. lIc:!E 3,/lO , S~Z·~ Date Completed /zIIIJTl Logged by ,-:Q,.I/, ~::;;-.....Depth ..., Meter

.HARZA ENGINEERING COMPANYGEOLOGIC lOGForm 5G-2 j,Sept.mber 1978PROJECT •• _r;A!_~!!.r: ______ l!_t.4: .•.•.• !'5.f.1.:B5hHt No.3!';O,te It , ..... ...... ~ ...... .Hoi. No ••'"A.f.Ii::I........••..•---.. Angl. (from Horizontal) ••••••• ~~.~ •••••••• Ground EI •• 8tion ••••••••• ~.!J ..........Feewr • ••• 'h~~._t:{....... r.~_ ........ a.aring ............QZ~Z.. 7. ...........- Rock EI •• nion ...... ~."!.u .... u .... Coordinates: N •••••••••••••••••••••• Oat. Suned ••••••••••• ~1.,.]1.IT.L....... o..rburdtn Thickn •••••••• 9:~ ..........E r ......... n ,. .•..... Oat. Completed ••••••• !.~~.!~.r!......... Ground-Wner EI •• a1ion .sL..dr.t~JiAr.Cor. Sizes ......... C? ..... I-Ii".~.Juu ToUi D.pth ........... r?',Z.9. ...... u.uu logged by uu.~A-.·.~.Y-uu ....... ..-~JLog ....I ....f ! 1 a-iflcation Ind Physical CondItion a: Q (SlImp' D_. Wattr L ••• I ••j aGraphic.1 i; ~115 I.- ... '! a:~ C cJRemarksa: Drilling OWte'tlrirtiCi etc.)~ 1'0· ,-S'~ ~!;~ ~h--~ /0-~'(~\oJ- ".o~~ ~ f~ ~. ~ ~~0 ~ -C.. /' ~'!I ~(O)tt:",...".I-~ ~ -. .V (,0' IllL ? 5\.;,4~ •-- -I-,,-S~~-- ..,. ~1. Clewly ~ .. ~ "ft. s-rf: 0 S~-~/ It~ Ct. ('"- 6,./:(, jll'Cf.. #r:.::. II ,/ /e";'P I"'C~. 61y:::.;> ~~z..~/"C.3' t>''';~ ",-' 10~- ~.,- -.

HARZA ENGINEERING COMPANYForm SG-2September 1978410-2 '-l-2.u~ ~~1..Cllly- ~ 30" ~~3 L-""'" t'I..rr"·(\·'1~I~.... 1...- ~'f. rr,.C("yGEOLOGIC LOGPROJECT ••• c.I!.f:.

HARZA ENGINEERING COMPANYForm SG-2Septlmber 1978GEOLOGIC LOGPROJECT •••••• CI!£~.f.~y. .. .J...9..R.-e ...... !.X.f:!.·8Sheet No. ~1 ..O.u .ff-/-:!!.t!.Holl No •••••!'.ti..-.l..........._.... Angll (from Horizontal) ••••••• l9.~ ........ Ground EI.,ation ••••• ~ L 7 ..............FI8tUrl •• Z'!lfJ$.. .... S.t~;Z.~........ Baring .~.~•••••••• ~;~/-f;. ............... Roc:tc EI.,8tion •••••••• fkJ.7 ..............CoordinateS: N '~~~fr"7..~~ ... om Stamd ••••••• I.?./.$"".~I. ........... .E .:;t./.~ .. ~.f/~~.:.l .... D8t1 Completed ••••• ~?:/.M.jzt ........••••.o..,burdan Thick".. • •••• ! fo. ·.?r ........ .Ground-Wat., EI."tion .~g~.'7..~.:'l~ ... .Corl Sizn ••• ..J:. •• )! •••• 1R.t?J. •••••• ToUl Depth •••••••••• f.!.'! ............... . Logged by ••••••••• h.l.~~tf.~X .......... .GraphicLotQaaiftC8tion ..,d Ptlyaial ConditionR.marlo(Sampl. Datil, Wltar La,.I.,Drilling Char.ct.rinica Itc..)0.0 - 1'.0 '!. 74/".s! ,..-cf co ,/llel tJ f$()4dlQ{fS(£~d'tH'I+~ !"lOe/of ~t'I.Mt/. IN: o~C~k-f~H -I-s b~~ 1> I.e. Cs ~ 0V. \,.WA *"'- ~ l-t \.. ~ c:"I' 4 eftS y /07 aM C IV)MAH-f."'" S(_'~'* /Jrll. ·r.!.ftt 1IlJII. ~o ~ Irlt.". 0." M (-11 ~()j IM~"

Harza ~nglneerlng?orm SG-IsCcrnpa~yREPORT OF WATER PRESSURE TESTINGPROJECT Cks.-I-el' tl'J f/e /?7'J-e.3:-.ee': I ~.; /J a ': e ----;;; j Til0."Hole No. PH -3 Angle (from Vertical) 20 c Ground Elevation 3/.7Location 10 /u~ .s 19ff Bearing2. 'SCJRock Eleva~ion 1'.7Date Started Il/lj-/17 Water depth durlng test-=~.::-.:.~_I ,.Date Completed IL/~/?I Logged byr- .....j), f ;-V'~ \ I-.....Depth .., Meter \11 ", -Pressure.... Q) \110"I0 ..... Q)o ;

HARZA ENGINEERING COMPANYForm SG-2September 1978GEOLOGIC LOGSh .. t No . .3.l!_Date .if./.!.!.,i 2!Hole No •• ___ tt.L-_l _________________ Angle (from Horizontal) •______ ?9_~_________ Ground Elevation ----___ 31:.( ______ . ____ _Feature _:!i-t.i".$.. __ ~L~j? _'!_________ _ Se.nng .---------:::-?::.~F:.r.:..-r;,-__ _________ Rock Elevation . _________ !.~~!. _____._______Coordinatn: N ______________________ Date Started --______ 8_1_.4_'(1 _____________ Overburden Thicknes. ------~~:~---t:-----E ----------Z-!.?------- Date Completed ____ .Lij_€-_IIL ___________ Ground-Water Elev?on f.!Z'_(,-~!,d: _____ _Core Sizes ___ z:_ti2_____ d()J ____ Tot. Depth ----------~,/f_---------------- Logged by _______ /!.. ./1 .. f.r::_y. ________ ...Graphicc_.Log.2I at.,9 oS>- ¥ at. Remarks:; Q. • -! CI .. ification and PtlYliCilI Condition Q:.0~"!QS'..0 a: (Sample Data, Water Levell,- ..:I ! a I ! a: Drilling "'aracteriltiCI etc.)~- ·S cic3~ ;;; 4( c.SL/O.l -t-~ / I.({ o,.l.urIs"~ -(I.... t- I ~" ,;.-Z~ Itt d(oY' -j.,«.,-t:t clo.'1~Y /&4.+1. .5 t..-..~,-'II.Z-It/,r CJ.~ ... ~f"- ~~-t- /, (S 51, ""'" "ft..-:1. 7r.·~~O4If:'. s-tQ .....-r- /0° ~tL.. 1='«./ ji.-? ~'ft. r--_~ 10"c.~I~ ~I'f"I. 'to- 1/ ~~~r!;'" ....I~ -~ ~ ..~~ 20 luslb{~ CQ~ I ... cs -~I Sree

· .APPENDIX BFINANCIAL ANALYSES -COST OF ENERGY GENERATIONCOMPUTATIONS

APPENDIX BTABLE OF CONTENTSLoadExhibit Expansion Capacity/ Growth FinancingPage No. Plan Res. El. Scenario AlternativeCost of Generation from Entire MP&L System---I B-19-1 Base Case All/- Most Likely N/A2 B-19-2 Preferred 2.5/885 Most Likely 12% Rev. Bonds3 B-19-3 Preferred 2.5/885 Most Likely 5% Loan4 B-19-4 Preferred 2.5/885 Most Likely 5% Rate of Ret.5 B-19-5 Preferred 2.5/885 Most Likely 5%/13% Combined6 B-19-6 Preferred 2.5/845 Most Likely 12% Rev. BOPlds7 B-19-7 Preferred 2.5/845 Most Likely 5% Loan8 B-19-8 Preferred 2.5/845 Most Likely 5% Rate of Ret.9 B-19-9 Preferred 2.5/845 Most Likely 5%/13% Combined10 B-19-10 Preferred L 5/84511 Most Likely 12% ?ev. Bonds11 B-19-11 Preferred 1.5/845 Most Likely 5% i...oan12 B-19-12 Preferred L 5/845 Most Likely 5% Rate of Ret.13 B-19-13 Preferred L 5/845 Most Likely 5%/13% Combined14 B-20-1 Base Case All/- Low N/A15 B-20-2 Preferred 2.5/885 Low 12% Rev. Bonds16 B-20-3 Preferred 2.5/885 Low 5% Loan17 B-20-4 Preferred 2.5/885 Low 5% Rate of Ret.18 B-20-5 Preferred 2.5/885 Low 5%/13% Combined19 B-20-6 Preferred 2.5/845 Low 12% Rev. Bonds20 B-20-7 Preferred 2.5/845 Low 5% Loan21 B-20-8 Preferred 2.5/845 Low 5% Rate of Ret.22 B-20-9 Preferred 2.5/845 Low 5%/13% Combined23 B-20-10 Preferred L 5/84511 Low 12% Rev. Bonds24 B-20-11 Preferred 1.5/845 Low 5% Loan25 B-20-12 Preferred 1.5/845 Low 5% Rate of Ret.26 B-20-13 Preferred 1.5/845 Low 5%/13% Combined-i-

APPENDIX BTABLE OF CONTENTS (Cont'd)Exhibit ExpansionPage No. PlanCapacity/Res. El.LoadGrowthScenario~ of Generation from Chester Lake onlyllFinancingAlternative27282930313233343536373839404142434445464748495051525354B-21-1B-21-lAB-21-2B-21-3B-21-4B-21-5B-21-6B-21-7B-21-8B-21-9B-21-10B-21-11B-21-12B-21-13B-22-1B-22-lAB-22-2B-22-3B-22-4B-22-5B-22-6B-22-7B-22-8B-22-9B-22-10B-22-11B-22-12B-22-13Base CaseBase CasePreferredPreferredPreferredPreferredPreferredPreferredPreferredPreferredPreferredPreferredPreferredPreferredBase CaseBase CasePreferredPreferredPreferredPreferredPreferredPreferredPreferredPreferredPreferredPreferredPreferredPreferredAll/-2.5/-2.5/8852.5/8852.5/8852.5/8852.5/8452.5/8452.5/8451. 5/845111.5/8451. 5/8451.5/8451.5/845All/-2.5/-2.5/8852.5/8852.5/8852.5/8852.5/8452.5/8452.5/8452.5/8451. 5/845111.5/8451.5/8451.5/845Most LikelyMost LikelyMost LikelyMost LikelyMost LikelyMost LikelyMost LikelyMost LikelyMost LikelyMost LikelyMost LikelyMost LikelyMost LikelyMost LikelyLowLowLowLowLowLowLowLowLowLowLowLowLowLowN/AN/A12 % Rev. Bonds5% Loan5% Rate of Ret.5%/13% Combined12% Rev. Bonds5% Loan .5% Rate of ~et.5%/13% Combined12 % Re v • Bo nd s5% Loan5% Rate of Ret.5%/13% CombinedN/AN/A12 % Rev. Bonds5% Loan5% Rate of Ret.5%/13% Combined12% Rev. Bonds5% Loan5% Rate of Ret.5%/13% Combined12% Rev. Bonds5% Loan5% Rate of Ret.5%/13% Combined1/ Including 1.0 MW addition at purple Lake.I/ For Base Case, diesel units only.-ii-

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Form SG-2Septlmber 1978 PROJECT •••• ~I.~.?t.'(t. .. ~f.t;. ...... (lf7..-.e ..•• , •••• 0 ••• ~".ro.Dati -"f/.2.iI()Hoi. No"ni...a':~h .... C .•... '-... ' Angl. (from Horizon'-" ••••••• ZQ.~ ......... Ground EI'YI'tion •••••••• ~,?9.:L ....... .F.nun .tr.q.~.I..J:IfI~h ... tcx,;, ... Burin, .•••••••••••••• 'ta.jj~.............. Rock Elnnion ••••••••••••• ~~._._ •••• _Coordinn.: N •••••••_••_••••••••••• o.u SUned ••••••••• Ij*.f.~Jr'1 ........... Owerburden Thidc". ......._•• Q ... Q ••••••••E •••••••••_.,':;._)•••• o.u Completed ••••'/I.I__ ~.J.'XL ...... _... Ground-Wnw EleYetion ••••••••••••••••••COri $lin ._ •• -IA:-f..n.UI.~ no. Totll Depth ... n ___ ... '-~~.O ........... uo Logged by __ .... nnn • .JJ..Jl£i..!.'1u .... .~Jtl-j tI-IGrlphicLot.-l-iRemerklf J 1 CInIifIadon Iftd Phytica. Condition Q (Sampl. D_, Wlttr Ley.,s,j ~ Drillin, CbarlC1arifticll1C.)ccJJcf 0"'- 'e cCII70 r:;, /la -I i'd Gr(J 11C cf, 0" l-f~V (d ws •.:.. (~, if&'~)-v~ ~ d,'..".. ,~~~ f4';o~; ... -~'' pa" dU. c!. lor ..-I-~. !=»\.c:;. cl..\,,~ s .....·....-I""~ i2 -I 71' ';:)- ~~t.,~ '" bo:l -~I~+\ -/ Co' ~loor. [it'5" ~".-V ,-r... - -~ Z3,o-,l"-1'-,'- k ~Il~I ~ f&~ta;-· I- I ,t)" (t.-. I.". -d.I ....~Afr(13)\ G-w 1...-- -~ I '0· ~I." -~\. .......... ".J3 z~ 31.0- -./ ~ . ~\o~!o"A-\0.\.... , --S3.G - .-0.0-~ 'f" ·1. eA"&' - lIet"" ~Dt>:\1 ... t.f'~ -~-~f1'4 ~.c~, -,... ~ .. ~.S~I~ . ~- .. r.,..~~ ~ 0...,~ -~ -OQ ;4 104-4'-':':- ~J 0 -~1:'".;~- --:5S.0~-I--I("".I- --j

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EXH 1 BI T B-21Page 1a of 13FINANCIAL ANALYSISDIESEL - 2.5 MWMOST LIKELY SCENARIODieselEnergy Fixed o & M FuelYear Generated Cost Cost CostMWH $ x 10 3 $ x 10 3 $ x 10 31982 a a a a1983 a a a a1984 a a a a1985 6788 295 267 8811986 7045 295 297 10031987 7314 295 329 11411988 7582 295 365 12961989 7856 295 405 14721990 8128 295 448 16691991 8472 295 500 19071992 8802 295 556 21721993 9147 295 617 24731994 9491 295 686 28121995 9600 295 742 31181996 9600 295 794 34171997 9600 295 850 37451998 9600 295 909 41091999 9600 295 973 44992000 9600 295 1042 49312001 9600 295 1114 54042002 9600 295 1193 57822003 9600 295 1276 61872004 9600 295 1366 6621200S 9600 1141 1461 7084TotalCost$ x 10 3aaa144315951765195621722412270230233385379341554506489053085767626868137270775882829686Cost ofEner9.lCents/kWhaa021.322.624.125.827.629.731.934.337.040.043.346.950.955.360.165.371. 075.780.886.3100.9-28-

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EXHIBIT B· 22Page 1a of 13FINANCIAL ANALYSISDIESEL - 2.5 MWLOW SCENARIODieselEnergy Fixed o & M Fuel Total Cost ofYear Generated Cost Cost Cost Cost Energ~MWH $ x 10 3 $ x 10 3 $ x 10 3 $ x 10 3 Cents/kwh1982 0 0 0 0 0 01983 0 0 0 0 0 01984 0 0 0 0 0 01985 4650 295 183 603 1081 23.21986 4720 295 199 672 1166 24.71987 4790 295 215 747 1257 26.21988 4870 295 234 832 1361 27.91989 4940 295 255 925 1475 29.91990 5010 295 276 1029 1600 31. 91991 5180 295 306 1166 1767 34.11992 5350 295 338 1320 1953 36.5;993 5520 295 372 1492 2159 39.21994 5700 295 412 1689 2396 42.01995 5870 295 454 1906 2655 45.21996 6030 295 499 2146 2940 48.81997 6200 295 549 2419 3263 52.61998 6370 295 603 2726 3624 56.91999 6532 295 662 3061 4018 61.52000 6698 295 727 3440 4462 66·62001 6698 295 777 3770 4842 72.220C2 6698 295 832 4034 5161 77.02003 6698 295 890 4317 5502 82.12004 6698 295 953 4620 5867. 87.62005 6698 295 1019 4942 7103 106.0-42-

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I '".tMetlakatla In~ianCommunityAlaska 11 Annette ~Finding of No Significant ImpactChester Lake Hydroelectric ProjectApproved by:M~ SEP 1 S 19l1li~ .~Assistant Administrator - ElectricRural Electrification AdministrationU. S. Department of Agriculture\ .

.,Environmenta' Assessmenton theChester Lake Hydroelectric Project2.S MW FacilityForFinancial Assistance to theMetlakatla Indian CommunityAlaska 11 AnnetteByRura' Electrification AdministrationEnvironmenta' and EnergyRequirements DivisionEnvironmental Services BranchSeptenber, 1980

, \TABLE OF r.ONTFNT'1-SUMMAA~ _. __ . PAGEA. Introductiq~ 1B. Project Descript10n 1C. Federa' and State Actions 2D. Alternatives '-E. Findings 3II. PURPOSE AND NEED FOR ACTION 3(A. Existing GenerationB. Proj ected NeedIII. ALTERNATIVES 4A. No Action 4B. Diesel Turbine 4C. Wind Enerqy 4D. Purcnase Power 5E. Alternative Hydroelectric Sites 5IV. AFFECTED ENVIRONMENT 5V. ENVIRONMENTAL CONSEOUENCES 5A. Air Impacts 5B. water Impacts 6C. Land Impacts 61- Prime Aqricultural land 62. Floodplains 73. Wetlands 7D. Flora and Fauna IMPacts 8E. Noise and Aesthetics 8F. Socioeconomic Impacts 86. Historical - Archeological I~acts 9H. Unavoidable Adverse Effects 9I. Relationships between Locil Short-Term9Use of Min's Environnent and theMaintenance and Enhancement of Long-TermP .. oductivityJ. I .... ev ... sible or Irretrievable Commitments 10of ResourcesVI. COORDINATION 10VII. LIST OF PREPARERS 11Appendix A - Letter~Appendix B - MIC's BERof Comment..33. .

I. SUM~RYA. Introduct ionThis Environmental Assessment (EA) is being performed in ACcordancewith the Rural Electrification Administration (REA) Bulletin 20-21:320-21,Part I, Section IV. 8.REA'Bulletin 20-21:320-21 and the Council onEnvironmental Ouality Regulations implement the procedural provisions oft~e National Environmental Policy Act (NEPA) of 1969. This EA is prepftred•to Meet the reouirements of NEPA, other appl1cable'rules Ind regulations,Executive Orders, and Secretary's MemorandUM on Land Use (No. 1827,Revised) .The ~tlakatla Indian Community (~IC) submitted to REA I Borrower'sEnvironmental Report (BER) prepared in accordance with REA draft guidelinesfor such reports. The REA has reviewed and analyzed this report and hasused it for preparation of this EA.contained in Appendix B.8. Project DescriptionThe REA hereby adopts Mle's BER asThe proposed Chester Lake hyrdoelectric project will be located on thewest-central shore of Annette Isllnd in southeastern Alaskl. AnnetteIsland is one of the large groups of coastal 1sllnds in the AlexanderArchipelago. The prOpOsed project is loclted on Waterfall Creek and is inthe viCinity of the city of Metlakatla. The proposed project consists ofthe following:1. Rockfill Dam: A rockf1ll dam would be constructed a Short distancedownstre. from an existing dam.The new dam would be SO feet in heightand .ould rl1se the normal pool level of the reservoir from elevation 858to elevation 893.Reservoir surface area .ould increase from 72 acres to14, Icres. Useable storage of the reservoir ~uld be 4290 acre-feet.1

, ,2. Spillway: The spillway will be a side channel unqated structureet:!.ated in bedrock ~~ .~~f1:~:~~ ::~!~~~y tc ,ass 1~00 cfs disharQe withl.q feet freeboard.3. Waterwals: A steel penstock 2800 feet in len~th and 24 inches indi~ete~ .auld convey water from the reservoir to the powerho~se attidewater. A second steel pipe 24 inches in diameter will extend throughthe dam with a remote controlled vllve on the downstream side {or emergencywater drlwdown and to provide water for occlsional aesthetic purgoses.4. Powerhouse: A powerhouse containing one 2500 tw turbine-generatorwould be located at tidewater below the dam. It .auld operate at a maxim~head of 870 feet with a mean effective head of 850 feet. The project isexpected to produce an averlge of 10.729.~00 kwh of useable energy peryea~.5. Transmission: ADproximltely 0.2 miles of 12.47 kV line will beconstructed to connect the plant into the existing transmission system.The transmission line would parallel existin9 access road and tie into theexistinq 7.2/12.5 kV loop-line from Purple Lake to Metlakatla.e. Federal and State ActionsFederal and state actions that may be required for the proposed project. .include: U. S. A""y Corps of Engineers Section 404 Ind Section 10permits.D. AlternativesAlternatives lVailable to REA include: 1. Approval of the proposedoroject and 'inanc111 assistance; 2. loproval 0' the project withconditions and 'inlnc111 Issistlnce; Ind 3. no Iction.The MIe hiS investiglted the 'ollow1ng Ilternatives: 1. no action;2. const~uct1on 0' diesel turbines; 3. wind enerqy; •• purchase power; Ind5. alternative hydroele,~ric sites.2

, JE. F;ndincs•water, and lan~resources in the affected arel. This project will have nosignificant effect on floodplains. wetlandS. prime 199ricultura' lands.threatened or endangered species. or known hfstorica' and Ircheolo~icalsites. Therefore. REA hiS reached a Finding of No Signiftcant I.pact.II. PURPOSE AND NEED FOR ACTIONA. Existinq SenerationI,The HIC currently owns and operates the Quarry diesel·electric plantand the PurDle Lake Hydroelectric Pllnt. The Quarry plant is locatedapp~oximately three miles south of ~takatla and consists of two 2160 hpFairbanks-Morse engines with 1ft installed clpacity of 3000 KW.The PurDleLake plant is located approximately four miles southeast of Metaicatla andconsists of three 1765 hp horizontal, Francis tyee turbines with aninstailed capacity of 3000 kw.MIC's distribution system co"tainsapproximately 32 miles of line serving 410 residenti •. " and 40 small and 15large commercial customers.8. Project NeedTo provide reliable power to future residential. commercia'. Indindustrial consumers. MIC has an estimate requirement for capacity andenergy of 9150 tw by 1981. and In energy capability of 33.3 _ill ion kwh(REA. April. 1977 Power Requirements Study). Existing firm capacity isroughly 4500 tw.projected needs.The proposed project will usist !lUC in Meting theseThe action of REA in the form of financial usistance toMIC will enable MIC to construct the proposed project Ind Meet theprojected need.This action is necessary to insure the efficient andreltable provision of electric power to MIC's consumers.3

, IIII. AlTERN~TIVESA • No At t 1 0 roIf no actfon was taken on MIC's request for financial assistance, theprooosed Chester Lake ~ydroelectricwould result in the failure of ~ICproject would not be constructed. Thisto meet the oresent power needs of itsconsumers and to deny sevice to new lPDlicants. The impact of thisalternative would result in economic disruption to the Metakatla IndianComrunity.It may also result in the need to construct more expensive,diesel turbines and/or purchase more expensive power from the KetchikanPublic Utf1ities System.B. Diesel Turbine~oreThe use of diesel turbines to meet the power needs of MIC would costthan the delivered cost of power from the proposed oroject. This isbecause of the increased cost of replacement diesel fuel, which continuesto escalate.Additionally, the Fuel Use Act of 1978 also places certainrestrictions on the use of petroleum in new power plants and generallydiscouraQes its use in new power plants. The environmental imoact of thisalternative .auld result in mere effects than with the proDOsed project.Possible oil spills, and increase air and noise pollution would result.C. Wind EnergyThis alternative is econom1cal with an average annual wind velocity of30 mph, a nearly steady wind magnitude and direction, and within atopographical area in which boundary-layer effects are ~inimal.overall wind speed, Siting areas, and an electrical ~ridFavorablecapable of usinginterruptible power are not available to MIC for this alternative.Environmental impacts with this alternative would not be significant exceptfor possible noise impacts associated with windmill desiqn of rotaryblades, terra\n effects, and weather conditions....4

D. Purchase Power~~: ~'~e~ft~.;ue ;"y~~t;gated a DOss1ble transmis~1n" linp tip.in tothe Ketchikan Public Utilities System. Ketchikan ~enerates over 16 Dercentof their pOwer with diesel turbines and would result in service to MIC withthis costly power.-This alternative NDu1d result in construction oftransmission line with probable insignificant environmental i~acts, butincreased cost of power over and above those costs associates with theproposed project.E. Alternative Hydroelectric SiteOne alternative site was investi~ated< ,for the proposed hydrelectricproject. Trianq1e Lake located approximately six miles northeast ofMetakatla would be a feasible site. The lake has enough surface area,elevation and flow (70 cfs) to support an estimation 2100 kw of primepower. Environmental i~pacts associated with this site include increasedtransmission line routing (9 miles vs. 0.2 miles), and geologic andhydroelectric enqineerinq complexities. These factors would contribute toincreased construction time, and costs of power.IV.AFFECTED ENVI~O""ENTSee section 2, pages 7 throu~h 73 of Mle's 8ER contained in Appendix B.V. ENVIRONMENTAL CONSEOUENCESA. Air ImpactsDuring the construction phase of the prOject, air impacts would resultfrom fugitive dust tmissions during construction activity and vehicularmovements. SIoke will also result from the burning of debris andvegetation removed during cleaning activities. These impacts will be ofshort duration and relatively inSignificant. Operation of the facilitywill result in no impact on air resources.5

, .B. Water ImpactsOurina construction of the prODOsed project, increased turbidity ands;ltation will occur in Waterfall Creek due to dam, spillway, and waterwayconstructionlcfivfties. Some erosion and sedimentation will also occurduring clearing, scrapin~,and compaction activities. All exposed Ireaswill be property revegetated with native plant species IS soon ISpracticable to reduce erosion and water quality i~lcts. Since'.construction activity will not effect the existing d .., potable waterintake structure or the stored water no chanqe in botable .. ter qualitywill occur. The above construction related impacts Ire considered to beminimal and of short duration.Operational impacts on water resources and aquatic habitat will beMinima' since the project will be built on an existing d. location thushavin~a minor fncrease in exist1nq fmpacts to the area. These fmpactsfnclude dfssolved oxyqen depletion, loss of habitat, surface levelfluctuatfons, and downstream scouring. However, these impacts have beendetermined to haye a .'n'.al t.pact since no fish specfes or ffsh nurseriesare present in the existing lake and downstre. area.c. Land I.pacts1. Prfme Agrfcultural LandThe proposed project .auld rafse the no".al pool ellYation from rouqhly858 feet to 893 and subsequently inundate IPprox1.ately 72 teres of land.The surface .11 of thl lake .auld roughly double. The land 1s currentlycovered with sparse Alpine vegetation Ind IPprox1.ate1y five acres offorlstld lands lDuld be iMPacted.Correspondence with the SoilConservation Service (SCS) (Appendix A) 1ndicates that -i.pacts anpotentill rlnge and forest land also appears minima1.-The SCS has Ilso. .

, .concluded that the ·potential for aqr1culture (farm land) 15 very minimal.·T"e D~,l. ~!S therefore determined that t"'4s !''''''~-+ w411 have"" affect onprime farmland, ranqeland, or forestland.2. !1Eodpl"lms - .The Army Corps~fEngineers (The CorDs)has indicated that they do nothave enouqh infor.at1on to delineate the extent of floodplains in theproject area (Appendix A). The Corps also state t~at since the anewstructure will provide .are control of the flow, the t~reatof downstream

• lO. Flora and Fauna ImpactsThe increase size of the like ~~~~ ~::4l~ ~r. the ~oss of approximately70 acres of vegetation and wildlife habitat. Vegetative cover in tne Ireasw~ere construction Ictivity will take pllce will also be lost. The project.ay result in hlbitat - suitlble for the survi~ll of fish thlt mlY betrlnsplant into the lite. Currently, there are no fish in the like.AQultic invertibrltes could increase in density after the llke .. fills, WIne1nvertfbrates existin~ downstream mlY be lost due to the nature of stream, ,flow IS regullted by the operltion of the completed project.Correspondence from the IJSFWS indicltes concurrence with REA's requestfor I dete~ination thlt the proposed project is not likely to affectlisted or proposed to be listed, threltened or endanQered species (AppendixA).The REA therefore finds that the proposed Chester Lake Hydroelectricproject will not affect listed or proposed to be Hsted, threltened orendlngered species.E. Noise Ind AestheticsNo si~nificant noise i~lCts will occur as a result Of projectactivities.The continuous presence of the waterfall at Chester Lake wtl1 be lost.The proposed project does incorporate provistons for releasing water tocreate an instant waterf.ll for tribal eeremonies. or for other aestheticpurposes.F. Socfoecon~ic IMpaetsNo adverse iMPact to housing. services. or infrastructure in the cityof Metlakatla ~llresult. Local lerchants will experience inereasedbusiness end amplO}ment durinq and after construction...8

, .G. Historical - Archeological ImpactsCorrespondence from the .A.~~:~I State ~isto!"-cc !»reservation Officerindicates that provided the old powerhouse is not destroyed orsubstantially ~odifiedby the proposed construction, they -do not feel t~eproposed construction will wapact any properties listed on, or eligible forlisting on the National Reqister of Historic Places· (Appendix A).Arc~eologicalsurvey was also performed in April 1979 by the University ofAlaska. ~e survey did not ~ve.l any cultural features that .arrant any

'. .J. Irreversible or Irretrievable Commitments of ResourcesDuring consti· .. .:!~Cl":. !a:c:-. :~!r',1Y. and material inputs ~" hac~itte~irreversably. Seventy acres of land will be inundated as aresult of dllii·c6nstruction. This land is sparse Alpine veqetation andcontlins five acres-of NOoded land.VI.COORDINATIONThe MIC hiS contacted the following agencies:~llskaDepartment of Natural ResourcesU. S. Fish Ind Wildlife Service4.U. S. Army Corps of EngineersSoil Conservation ServiceC~ents received from these agencies are contained in Appendix A.. .10\ ,!

. . ..VII.A. REA:LIST OF PREPARERS-Jo~ephBinder - B. S. Chemical Enqineering; Director, Environmental and- Energy Requirements Division.Directs and isiresponsible for administering the EERD.staff functions related~oDesignatesthe environment and energy reauirelentactivities required by the REA and its borrowers.Charles Crowley - Diploma, Marine Engineering; Chief, Environmental

APPENDIX AComent Letters

.-. _ ..SOIlConserv.l.on~rvir.Profession.1 Center - Suite 1292221 E.st Northern Lights !ou1ev.rdAnchor.ge, AK 995"" (~I'I"~ ""'._I .June 18, 1980.,l.~Ms. H.ncy StephensContract AdministratorNetlakatla Power and LilhtP.O. Box 346Metlakatla, Alaska 99926Dear ~b.Stephens:The available resourc~ data is soneWhat li.ited for the ar.a of your ~roposedChester Lake Project. However. t have exa.ined what the Soil ConservationService has, and have discussed the proposal with both theForest Service and Bureau of Indian Affairs personnel. As a result. Ihave co.e to the conclusion that the potential for a,riculture (fara land)is very .inimal. I~act on potential ranle and forest land also appears.int.al.ke have returned the plan a.p for the works of illprovnent under separatecover. Please feel free to calIon our alency in the future.:;;-;;i /iuA1Iurton L. ell !!ord ~Stat6 Resource Conservationist

- -United States Department of the InteriorFISH·."ND WILDLIFE SERV1CE10J I E. Tl,;DOR RD.ANCHORAGE. ALASKA 99503(90,,276-3800Mr. Charle. PhilpottKana,er. Western Area-IleetricDistributiou Systems Divi.ionlural Electrificatiou Admini.trationWa.hiDltoD. D.C.17 JUN i980Dear Mr. Philpott:This responds to your raque.t for tDfor.atioo re&ardtDa the occurrenceof proposed or listed threatened or eDdanlerad specie. which .., be. affected by the propo.ed Che.ter Lake Hydroelectric Project on ADDette1alaod io .outheastero Ala.ka.Ia.ed 00 the bast iIltorutioo curr_tly ."ailabl. co ua. 110 propo.ed orli.ted threatened or aDdanaered sp.cie •• for which the Fish aDd WildlifeS.rvice bas re.ponsibility. are pre.ent ill the proj.ct area. I CAn.therefore. coocur with your decarainatioo of "will DOt affect".. .lev 1Dforution iodicatiDa the pre.eDce of CDrreatly 11ated threat_ador _daDlered .p.cie. admini.tered by the Fi.h aDd Wildlife Servic. orthe l1atinl of Dev .p.ci •• wbich .., b. aff.cted b7 the propo.ed projectwill require recooaideratioD of JOUr d.c~oat1oD.Ve appreciate your coocena for _aDlared wildlife. '1.... COlLtact usif you hav. qu •• tiona or if va caD " of luth.r ... i.taoce./*11Kftal'1. /)lC:: /n. / I-t--iLaGfCiif Ar .. Director•••

. ..r· ..I., S. H ..... OND, GOVERNORChip Dennerlein, D1rect~rDEPARDIL'T OF 5ATtJRAL RESOURCES "g Wlrehou" Or .• SUite 210June 16, 19801130-13DIVISION ", ~A"ICSAnchorage, Ala .. 8i501274-4675Raney StephensContract Admini.tratorMetlakatla Uaht and PoverP. O. lox 346Metlakatla, Atuka 99926,This letter i. in re.pon.e to your reque.t for our comaent. re.ardingimpact of the Che.ter Lake Hydroelactric ,roject on cultural ra.ources.We .re avare of th. exi.tance of a h,droelectric powerhou.e built in1928 and used until 1956 which t. located at the ba.e of the vaterfallon Waterfall Creek. We further under.tood you to tall u. over thetelephone the old powerhou.e would not ba de.tro,ed or .ub.tantially.edified by the ,ropo.ed con.truction. Provided tho.e condition. are.. t we do not fael tha ,ro,o.ed con.truction viII iapact any ,ropertiesli.ted on or eliaibla for li.tin; on tha Ra~ional ..,i.ter of Hi.toricPlace.. We feal thus due to the .iailar a~tivitia., hydroelectricproduction, of tha older and new .tructure.. In the event tha ,ropo.edconstruction viII phy.ically altar the 1928 .tructure, fadaral regulat1on~36 CTI 100, raquire a deter.iDation of aliaibility for inclusion on theNational lali.ter of Hi.toric Place. and .ubsequent con.ultation withthis office. At that ti. a deteniDatiOD of effect OD the structure bythe ,ropo.ed action would be.. to be .. de aDd ~tilation ,rocedure.dev.loped to Id.n1a1ze Sapact.. U ,OU haft aDY further que.tion.re.ardin. this '1.... contact us.Sincerely,..... _/~(J~ ... ,j)~ ,/lib-----11111,,1 S. "ableState B1.toric Pre.ervation OfficerEnclo.ure./ev1'-"

United States Depanment of the Interior-. .- ~.FISH AND WILDLIFE SERVjCE.0. I E. TUDOR RD .ANCHORAGE. ~LASKA 9950)(907) 27b-3800I • JUN 1980Metlakatla Power. LightP. O. Box 346Metlakatla, Alaska 99926Dear Sfrs:This letter is a ~sponse to your request dated May 22, 1980, for aU. S. Fish and Wildlife Service determination on the presence of wetlandsin the Chester Lake area of Annette Island. On June 18. 1980, one ofour biologists visited the art. and found the min~ wetlands involvedin the Chester Lake watershed to be inSignificant.We found the entire watershed to be domin.ted by bedrock. The outletstream cascades down a bedrock face .nd enters the salt waters ofPort Chester at an angle of about 800. No intertid.l fish habitat isp~s.nt. Adjacent to the Min tributary of the lake is a shallow bodyof Wlter about 1/4 acre in size. The associated prilMry production inthis area is minilMl and we Judge this wet area to be insignificant ••-, ,. .\ ,.'

NPAD1-PL-FP".L.' ~oanf." ..••-.....O':Ita. Jancy St.ph.nsMetlakatla Pov.r and 1.1lhtP.o. Iol( 346Metlakatla, Aluka 99926Dear Ma. St.ph.a:DEPARTMENT OF THE ARMYALAaKA oe.-rRICT. CORN OP'IIHOINIlER.".0 .• _700 •• NC..o_.U .• U .... "'030 JUN 19804. '.' ....--In r.apona. to your l.tt.r of 22 Nay 1980, va aub1l1t the follow1nl~nta:a. Ev.ry au'.u baa a flood plain, 1acNe".r, •• do DOt uv. anoulhinformation to d.lin.at. th •• ~t of thoa. 1D 10ur proj.ct ar.a. Sincethe new atructur. will provide .ar. cODtrol of the flow, the thr.at ofcIDwD. tr.alll f1oocU.n1 vi11 b. ~aduced.b. A Dal)art_nt of the AI'IIY ,.twit vUl 1». r.qu1r.d b.for. th1aproject car. i). ccmatruct.d. 'lb. dr.dplla for the tailrac. aDd theconatruction of the portion of the outfall lin. that would be below the.an biah vater1ine (13.7 MLLW), of Port Ch.at.r, ~equ1r. Corpa of Enain.enauthorization purauant to Section 10 of the l1".r and Harbor Act of 1899.Th. dam in Waterfall C~eek and the portioaa of the poverboU8e fill and theacc.a. road f1l1 that would 1». 1».1_ the hip Ude Una (18.7 MLLW), ofPo~t Cheat.r, require Corpa of .a1Da.~a a.thoriutiOll purauallt to Section 404of the Clean Wat.r Act of 1977.1 Iaa'ft iacloa.d a puplllat aplaillina theDepart1leftt of the J.nrJ 'ertl1t 'roar- aaill1at.r.d by the Corpa of Inain.er.ed a blank para1t application. AdcHtioul patwit iDforaation .y be obtain.dby cOIlt.acUq our laaw.atory 'UDCtiOU Iraacb at 279-4123.If you Uv. any further queationa, '1 .... do DOt h.aitat. to contact1Ir. Muon D. Vacla, of ., nood Plain llaua_nt lection, at 752-3246 •, ...• iDeer.1y,2 IDcloM atat.d• :.~ ............. I

. ~.•,- It:tir -e".' .. : ""-",. "1-'Ic.... +&a.-.. -..+-Io

f ~r;' ,•Jp'---•1&1CDi. cI·CDCDCQ.CD...I0%U-z•.'a.ANNETTE ISLAND ALASKAo t ..1c.A~1 • M'LEICClllfTCQtr-·-----· -- . ------.-- -' ____ .'._0'-T'ERYALS • 100 'T.

ALASKA POWER AUTHORITYCHESTER LAKE HYDROELECTRIC PROJECTSummary of Public MeetingFebruary 18, 1982Metlakatla, AlaskaOn Thursday evening, February 18, 1982 at 7:00 p.m. a publicmeeting was held in the Metlakatla Indian Community council chambers tohear reports and discussion on the Chester Lake Hydroelectric Project.Twenty-three people attended (list attached). The Metlakatla IndianCommunity Council and Met'akatla Power and Light Board conducted themeeting. Other agencies represented included the Alaska PowerAuthority, Rural Electrification Administration, Bureau of IndianAffairs, and Harza Engineering Company. Harza conducted the updatedstudy of the Chester Lake Project for the Alaska Power Authority andcommunity of Metlakatla.Brent Petrie of the Alaska Power Authority gave a brief history ofthe Chester Lake Project from:..1. Its use as a power and water supply.2. The recommended development of Chester Lake by R.W. Retherford andAssociates in a 1977 definite project report.3. Exemption from licensing by FERC, and4. An appropriation by the 1981 Alaska Legislature for engineerin9feasibility studies.He explained that the report to be discussed tonight was the resultof the 1981 appropriation and was required to determine the economics ofthe project before any state funds could be allocated for construction.Richard Meagher of Harza Engineering Company presented a summary ofthe geotechnical work that was underway at Chester Lake in November andDecember 1981 and went on to present information on the following:1. Electric Load Forecasts - Although the overall electric energydemand is expected to grow, some reduction in residential electricenergy consumption ;s expected in response to conservation measuresin the area of electric space heating. Three different forecastswere prepared in response to various economic factors (timberprocessing, fish processing, harbor development, etc.).2. Capacity Needs - When the existing Purple Lake hydro plant reachescapacity or is low on water, the remaining capacity need is met bydiesel generators. This may be for a short period to meet peakdemands when the mill is operating or may be for longer periodswhen Purple Lake water supply is depleted.3. Economic Evaluation - Several plans were presented based upon theircost in present day dollars over a 50 year planning period.

The "base case" situation of existing Purple Lake hydro and newdiesel woul~ cost $55.7 million in Januarv 1982 dollars. The ChesterLake plan plus existing hydro and diesel as needed would cost $35.5million. A Triangle Lake plan with existing hydro and diesel as neededwould cost $43.8 million. These are economic costs over a 50 yearperiod and not construction costs.Mr. Meagher then explained the detailed aspects of the Chester LakeProject, including geology, environmental, access and costconsiderations. There was considerable discussion about access andcosts of the project. Mr. Solomon Guthrie asked whether or not a roadwas necessary for construction. Mr. Meagher said the plan included aroad but that the project could be served by a barge. A footpath couldreplace a road for maintenance. Mr. David Horton of BIA mentionedpossibilities of road development with future timber sales and that wassomething that would need discussion.Mr. Meagher explained that the present concept for powerhouselocation was different from the 1977 report because poor foundationconditions and steep talus slopes required moving the powerhouselocation to more stable area near the mouth of Chester Creek. Mr. JackBooth asked what the cost difference was of this location over theother. Mr. Meagher said the main difference in construction cost wasthe cost of the access. Total cost estimate for the entire project is$13.9 million in January 1982 dollars of which the access road is about$1.5 million. Mr. Booth was concerned that the present cost estimatewas so high and indicated that Harza staff once said the project couldbe constructed for $5.48 million. Mr. Meagher said that if Harza staffactually said that they were out of place since no studies had yet beendone. He said they may have said some sort of project could be builtfor $5.48 million, but it certainly would not be the 2.5 MW storageproject they had investigated.Al Yost of REA asked if there was a 1985 on-line construction costestimate. Mr. Meagher said this would be discussed in the cost ofenergy analysis. The cost estimate to bring the project on-line in 1985was about $16.8 million.Solomon Atkinson asked how much higher the storage dam would bethan the present water supply dam and would there be any debrisproblems. Mr. Meagher replied the storage dam would be forty feethigher than the existing dam and there were provisions for clearing thebrush around the reservoir before filling.There was aeneral discussion of the differences in the R.W.Retherford report and the Harza report. It was pointed out that theelements of the Harza estimate were very comparable to other' costs thatwere being bid on nearby projects near Ketchikan and Wrangell. Mr. BoboDean pointed out that the differences between the Harza estimate andRetherford estimate were more than just the access road and inflationsince 1977. Mr. Petrie said that earlier estimates may have been toolow. The Harza study also has the benefit of more field data on thesite conditions.2

Solomon Atkinson asked about the possibility of locating thepowerhouse where originally planned in the Retherford study.Mr. Meagher and Mr. Petrie pOinted out that the loose rock in the areawas very steep and that cutting into the toe of the slope could make itunstable. Mr. Meagher said in the view of his company it would not beprudent to locate the powerhouse below the talus slope where it would bedamaged in an earthquake. It was his opinion that to excavate andstabilize the area may cost more than the present project configuration.Mayor Nelson pOinted out that the existing dam is in need of repairand the community may have to spend a large sum on the dam just tomaintain its water supply.Dave Horton of the Bureau of Indian Affairs thought the access roadcosts might be too high and suggested contact with the BIA Highwayengineering group in Juneau. This was agreed to be do"e.Mr. Dean asked Mr. Yost of REA if there were any changes proposedby REA that would affect the REA loan program. Mr. Yost replied, yes,that interest rates for generation facilities were proposed to be raisedto 12 - 14%.Solomon Guthrie asked about the possibility of Purple Lakereservoir expansion. Mr. Meagher responded that it was examined andthat only a very small amount of additional energy would bp. availablebut at significant cost. Harza did not feel additional reservoircapacity was justifiable but that additional capacity in the powerhousecould be more favorable possibility.Jack Booth asked if costs could be reduced by reducing theinstalled capacity at Chester Lake and building a smaller dam. Pros andcons of this were discussed at length. A storage dam would regulate thewater for use during high electricity damand and or low water flowperiods. A run-of-the river project would provide less dependableenergy, when the water was available the plant would provide energy andwhen it was not available then the capacity needs would have to comefrom diesel. Purple Lake might provide regulation for a Chester Lakerun-of-the river project.Mayor Nelson asked where costs could be cut. Mr. Meagher suggestedfirst looking at the access road, if its inconvenience during operationwas acceptable; Secondly, a lower dam and run-of-the river projectcould be considered; after that, shavin~ back on the installed capacitywould be possible. However, reducing capacity would eliminate theability to generate if surplus water was available and could be a badtradeoff since the other option was diesel. The equipment costs of thehydro plant are not as significant as the civil works items. Reducingthe dam height and access road would probably be the most significantcost savings but reducing the dam height would affect opprat;on. Thecosts might be reduced by about S3 million by eliminating an access roadand building a lower dam with access by helicopter rather than bycab1eway. Mr. Meagher emphasized that despite these cost cuttingmeasures that the costs would still be greater than the 55.48 million. .3

which had been requested from REA. Mayor Nelson said that fina~cing wasthe main concern of the community.Mr. Yost of REA said it would be difficult to locate aggregate forconcrete on Annette Island and wondered if a rockfill dam could beconstructed at less cost. Mr. Meagher pointed out that the volume ofmaterial in a rockfill dam would be more than in a concrete structureand significant amounts of concrete would still be needed for thespillway and outlet works. In a concrete structure the spillway wouldbe incorporated into the dam and the volume of material would be less.There may not be a major difference either way, but there are feweruncertainties with the concrete structure. Mayor Nelson pointed outthat the aggregate would probably be shipped in from British Columbia asit is in Ketchikan. Mr. Meagher was aware of this and considered it inthe cost estimate.Mr. Jack Booth asked what happened to the idea of a rockfill damwith a metal face. Mr. Meagher replied that Harza believed it would beimpractical from a maintenance standpoint, since the amount of drawdownin the reservoir would be controlled by the need to maintain storage forthe community water supply. It would not be easily possible to drawdown the reservoir to make the periodic inspections required of themetal facing. Mr. Booth asked if it would be more economical to installa 1000 KW plant rather than a 2500 KW plant. Mr. Meagher said hethought not since the site was cabable of 2500 KW and to add 1500 KW ata later date in the near future would tend to increase overall costs.Equipment would have to be ordered twice and contractors would have tomobilize twice.Mayor Nelson wondered if we should go back to the drawing board andsee what could be done for $8-9 million. John Leask said he did notthink so and felt that money should be found to build what was needed.Mr. Petrie explained how APA used the economic analysis to recommend themost economic project. He suggested that based on the Council's,Boards, and Mayor's comments that they should have the engineer analyzesome other project arrangements and then select the most economicalarrangement. To date we have concentrated on one project arrangement atChester Lake and APA could look at other possibilities, report back tothe community and then recommend and select the most desirable option.Mayor Nelson said he was concerned with the end cost to the consumer andthought the selection should consider that costoFinancing terms would bea concern of the community.Mr. Dean summarized that several financing options are underconsideration by the Legislature and it would be important forMetlakatla to make its concerns known to their legislators and theGovernor. John Leask asked if APA could loan money to the community forproject construction. Mr. Petrie replied that APA could not under thecurrent grant program and that the Legislature would have to authorize aloan.Mr. Petrie reported that APA staff had reviewed t~e report and thatbased on economics, the report showed Chester Lake to be superior todiesel generation. Their calculations showed that the project would4

meet the five percent rate of return test for fundino under currentlegislation. This project appeared to be competitive with dieselgeneration from the day of start up in 1985, which is not always thecase with other projects where the crossover with diesel alternativesmay be two to five years after start up.Solomon Atkinson said he did not see how Metlakatla could afford towait any longer since costs would go up. He recommended proceeding withChester Lake and trying to get favorable financing terms from either theState or REA, and asked Mr. Yost of REA for his opinion. Mr. Yost saidhe was surprised at the cost increases since the 1977 report, but thatthey seemed in line with today1s costs a~d those costs would increasethis coming year. Jack Booth said that smaller project options shouldbe examined. Mr. Yost said smaller projects may produce less usableenergy and that should also be considered in the financial analysis.Solomon Guthrie said he agreed with Solomon Atkinson and thouohtwork should proceed with some cost cutting measures included. As anexample he said the road might be included at a later date.Mr. Booth asked about the rate of return on the project cost. ~r.Petrie explained that the five percent rate of return was a paper test.The actual cost charged under current law would be a postage stamp ratebased on the costs of operating all APA projects. If the State builtthe Chester Lake project, its operating and maintenance costs would bepooled with the costs of other projects and a single postage stamp rate' .would be charged for all energy sold from those projects. Mayor Nelsonasked if one project was losing money and another was making money wouldrates on all projects be raised to cover the money loser~. Mr. Yostoffered an example of the Solomon Gulch project near Valdez where O&Mcosts are 1.3t/Kwh and a hypothe~ciJ Ch~ter Lake project with O&Mcosts of say 4.0/Kwh. Their O&~would be~$ totalled then divided bythe total energy produced. The resulting cost might be 2.0t/Kwh andtherefore the low rates might be increased as more expensive projectsare added to the pool.Mr. Dean pointed out that the payback of only O&M costs would bethe situation only if the State owned the project at Metlakatla andthose arrangements would have to be negotiated. ~e asked how operationwould be handled. Mr. Petrie replied that O&M would likely becontracted back to the local utility and APA did not envision placingits own O&M personnel in Metlakatla. APA may have some of their ownoperators at larger projects, but Chester Lake would be operated byremote control from Metlakatla Power & Light. Mr. Dean asked if theState had to be the sole owner or could they be a joint owner. Mr.Petrie replied that he thought a joint ownership arrangement waspossible where distinct parts of the project were owned or liened byseparate financial backers. Mr. Dean wondered if the State andcommunity could own undivided interests in the facility. Mr. Petriesaid he would have to research that issue. Mr. Dean said if that waspossible, then Metlakatl ~nd APA might set up a local operatingauthority that would ex~ on paper to own and operate the project.5

Mr. Atkinson felt Metlakatla should present a request package totheir legislators very quickly. Mayor Nelson summarized the consensusof the meeting so far appeared to favor going to Juneau and urging grantfunding for this project. Mr. Dean pOinted out that if the State ownedthe project or a part of the project then there would need to benegotiations on ownership and use of lands. Mr. Atkinson said alloptions should be examined and that Metlakatla should try to securefavorable financing from REA since the terms were different than Statefinancing.Mr. Dave Horton of the Bureau of Indian Affairs asked if once ratesare set for the O&M payback can they be changed at later date.Mr. Petrie said yes, the rates are subject to annual review. The O&Mcost will generally rise with inflation as labor costs go up. Theaddition of new projects to the State power pool with different O&~rates would also require adjustment.Mayor Nelson asked Mr. Yost if REA would have any problem withjoint own~rship of a project which might involve Metlakatla, the State,and REA funding. He said joint projects had been financed by REAbefore. At the present time the APA is not an eligible REA borrower asis Metlakatla. Mr. Dean said this is an issue that would have to beaddressed during joint ownership negotiation. Mr. Dean requested aletter from APA which identified the dollar amount that would be neededfor construction. Mr. Petrie said APA could provide such a letter annthat funds needed to meet oblioations on the Chester Lake storaceproject would be about $16.8 million ~or a 1985 on-line date. -Mr. Booth asked if APA could compute the retail power rates with acombined Chester Lake, Purple Lake, diesel system. Mr. Petrie said hedidn't think APA could without knowing a lot more about the distributionsystem. Their cost of energy projections project generation costs onlyand the distribution costs have to be added on to that. Oistributioncosts in Metlakatla are now 2.5¢ - 3¢/Kwh. If distribution plans do notchange significantly that cost could be added to the computed systemgeneration cost to get a good idea of the retail rate.The issue of ownership came up again. Mr. Petrie said it would behelpful if Mr. Dean could prepare a letter for the community to send toAPA with a list of questions where written responses would be helpfulfor all involved. An appropriate time to address those would be afterthe Legislature and Governor had acted on the budget so the fundingcircumstances would be more clear.Al Yost noted that the schedule allowed ten months betweenbeginning of design and mobilization for construction and wondered if aJanuary 1983 mobilization date could still be met if design did notstart until July 1982. Mr. Meagher replied that it would be very tightand a January date could probably not be met but that the documentscould still be prepared to make effective use of the 1983 constructionseason using a March mobilization date.Solomon Guthrie asked another question about rates. Mr. Meaghersaid there would likely be an increase in rates but the magnitude was6

dependent upon the financing scheme that was available to fund theproject. With REA financing the rates would be quite higher thanpresent cost, but with State financing the project would be State owned.Solomon Atkinson asked that an exhibit be included which showed theescalated costs. Mr. Petrie and Mr. Meagher said that could be done.Mr. Petrie asked questions on the use of wood heat in the communityand what was planned for the new housing units that would be installedin the near future. Mr. Guthrie said that wood stoves were installed inmost of the new units in addition to electric heat. Mayor Nelson saidheating alternatives other than electricity may need to be examined ifthe financing terms greatly increased energy costs. Mr. Petrie askedabout insulation in the new housing stock. Mr. Guthrie rep1ied that a1lnew homes were well insulated. Mayor Nelson added that all home wa1lswere of 2x4 construction and he on1y knew of one home in town with sixinch walls.The meeting adjourned about midnight.7

CHESTER LAKE PROJECTAttendence: 6th Session of the Council of 1982February 18, 1982NAMELeandro A. Guthrie, Sr.Frank R. HaywardMelbourne A. BoothPat Wi 11 i amsJack BoothRobert K.Henson, Sr.Solomon Guthrie. Sr.Richard MeagherSolomon D. AtkinsonBrent N. PetrieCasey Nelson, Sr.H. Bobo DeanRosebelle G. NelsonReggie AtkinsonBob RidleyWarren G. DorlandA 11 an K. YostRonald NilanGordon S. ThompsonRussell HaywardGreg ArgelDave HortonLou RiggsREPRESENTINGCouncilmanCouncilmanCouncilmanCouncilmanCouncilmanCouncilmanCouncilmanHarza Engineering Co.CouncilmanAlaska Power Authority-AnchorageMayorAttorney, MetlakatlaSecretaryMP & L Board of DirectorsMP & L Board of DirectorsMP & L ManagerR.E.A. - AnchorageM.I.C. StaffM.I.C. StaffMP & L Board of DirectorsBIA Field RepresentativeBIA Forester - JuneauCouncil manR.E.A. - Seattle

.-;:~::.\ United Slates({tAj;' Department~. of Agrlcu:tureRuralElectrificationAdministrationWastllngronDC202501 19::P.o. Box 72)4-Bellevue, WashingtonFebruary 24, 198298007Mr. Brent Petrie, Project ManagerAlaska Power Authority334 West 5th AvenueAnchorage, AlasJca 99501Dear Brent,JAs you requested, I am providing you with comments on the Chester Lake feasibilitystudy. Although II&llY of these collUllents were brought out by others during our meetingwith the Metlakatla Indian Council, they are being repeated in this letter becauseI feel that they should be addressed in the final version of the Chester Lake report.My cOllUllents are as follows I1. Reference is _de to RE'A Type 408 construction on page V-12 of the repon.I have checked with the REA Distribution Standards Branch and they are not aware ofany such construction standard. We have concluded that the nUllber (804) lI&y have beentransposed to (408) since the REA Form 804 contains construction drawings for 7.2/12.5kVdistribution line structures.2. During our February 18th meeting, _ny questions were raised regarding theissue of available financing alternatives. Although a verbal explanation was givenon this topic during our meeting, it is my opinion that such an explanation shouldhave been included &8 part of the report. In addition, it would have been interestingto see the results of a sensitivity test for each financing sch .. e on the bus bar costs.Results shown as costs per KWH would have added to the clarity of the report.J. Severa.l questions were raised concerning how ¥holewe power rates would bedetermined if the entire project were built with State grant fUDda.For exaaple, oneperson wanted to know if the residence of Metlakatla would ever find theaaelvessubsidizing the operating costs of other projects in the State of Alaska under theproposed rate fonaula. A brief explanation of this proposed rate formula wouldresolve aany such questions.4. From an operatioD&l. standpoint, it is ay opinion that it would be better to~..a.ve two g.n ....... tors of equal size rather than one large generator a.t Chest.r Lak.. Inthe .vent that one gen.rator ahould break down, the co_unity would be able to continueusing the other UD1 t •5. It is ., opinion that the site selected for the location of the powerhousewas the best. However, in order to rule out oth.r s1te locations, perhaps a costverses benefit analysis should be done with the powerhouse located at a site closerto the Walden Point ROad. Are there any alternate routes for the propos.d road thatwould lower the cost of the p;-oject '? Would BIA funds be available for this road ifthe road were to be used as a logging road in the near future'? Would barge constructiorbe ~ore economical?

United StatesDepartmentof AgricultureRuralE lectnflcatlonAdministrationWashingtonD.C20250Mr. Brent Petrie, Project ManagerFebruary 24, 19826. A fairly good analysis vas included in Chapter lIon historical demandsand historical energy consumption levels. However, I am afraid that the impacton energy usage vill be greater if, for example, the retail cost of electricitydoubles. It is my understanding that the retail cost of electric energy vill goup substantially if funding for this project from the State does not materializeor if REA does not provide a dificiency loan (at 5t) for the reyised estimate.If that were to ever happen, I believe that the per consumer energy usage atMetlakatla vould approach the Ketchikan per consumer energy usage level. Thismeans that the present cons~ptien lev~l in the low scenario is too high. If theaverage energy usage were to drop to the Ketchikan levels, it would probably bebetter to build the Chester Lake project in stages as the Purple Lake project vasdone. In other vords, consideration should be given t.w.rm building the dam andthe penstock to accommodate a 3 MVA poverhouse. However, instead of installinga 3 MVA unit nov, perhaps a 1.5 MVA unit should be installed vith provisions forinstalling another 1.5 MVA unit at a later date vhen the demands necessitate it.-I hope these comments ~reof some value to you.~1h~ " C, ~)') 1Louis E. RiggsREA Field Engineer, Alaska

Cl~~,-,-Lc.'_(.·(~··-,.;:.el 2-March 2, 1982~r. Brent PetrieAlaska Power AuthorityJJ4 West 5th AvenueAnchorage,Alaska 99501r...' - I ,On February 18, 1982, a lIeeting _s held in Metla.katla, Alaska withrepresentatives of Harza. Engineerinl. Alaska. Power Authority, REA and theMetlakatla Indian Council. The purpose of this meet1n& _s to review anddiscuss the draft feasibility report on Chester Lake prepared by HarzaEngineering Co~ny. The following comments are submitted in conjunctionwith that meetingl1. The Energy Forecasts prepared under three different scenarios, low,most likely and high, appear satisfactory and we would concur with theestiDBted projections under the ~iost L1lcely Energy ForeCAst condition. However,it should 'be kept in .ind that if Chester lAke is constructed, retail ratesin the future will surely increase which could lead to reduced consumptio~'in the community. In addition, in discussions with the ~Ayor, ~~. Casey Nelson,an energy conservation program is to 'be conaidered 'by the cOllUllW1ity whichcould further result in reduced energy deman A.2. The cost estimates included as part of the report estimate constructioncosts of the project at January 1982 price levels. It did not expand the coststo include price escalation 'be;)lond that date or include interest duringconstruction. We would recolllllend that the final report include the total costof construction, including LX, through the on line date of January 1985.J. Considerable discussions occurred. during the meeting concerning variousf'1nancing arrangmenta including 100% REA financing, 100% APA f1nancing and apossibility of joint financing 'between REA and APA. It would seell the reportshould include a section indicating the total project costa based on at leastthree different financing alternatives and at least three different interestlevels, such as 5~, ~ and 12%.4. The report included an economic e'Valuation which compared. the costs of eachalternative power project over the project life of tbat project using parametersestabl1ahed. ~. APA. Although we have no problem with this, we would a1.&o 11keto see & coat of pORr analya1a tor Mch ca.e which' would 1nd.icate the overallbus bar coat of energy auUJR1ni 'Various interest za tes.5. ~r1ng the .eting on Feb%uary lB, there were alao discussions concerninghow the wholesale power zate would 'be developed. for Chester Iake assuming APAfinances the entire project. '!berefore, the tinal report should consider anadditional section describing the wholesale power rate derivation undercurrent legislation.

2 -' APA6. Alao during the meeting, there 18S considerable discuss10n regardingposs1ble .ed1t1cat10ns to the proposed project in an attempt to lower theconstruct10n costs. Ite. discussed included. butwere not lim1ted tOI loweringthe height of th8 propoeed concrete daa, adding only one 1.5 MW un1t andincr.sing the capac1ty of Purp~e lAke. Although we have no object10ns toanalyzing other a.ltemat1ves, we do not th1nk 1t would be economically prudentin the long term to alter the Cheater Lake Project as 1t currently 1& proposedby Barza Engineering.7. On September 15, 1980, REA prepared. an ihvUonHntal A .... s .. nt for theproposed project and r.ched a F1nding of No S1«n1f1cant lIlpact. 'lbe proposed.project at that t1ae viaua11Hd a rock f1l1 da. would. be conat.%'\lcted. belowthe existing Chester take dam. Harsa currently proposes to construct an~8 ~RP~ h1gh concrete arch-grav1ty daa across Waterfall ereek. V11l theproPosed. change 112 dam construct10n affect the or1g1m.l FONSI reached. by REAin September 1980?8. Quest10ns regarding ownersh1p of the Chester lake Project were alaobrought up during the course of the .. eting. It .. y or _y not be appropriateto d1scuss th1s 1tem in the final report.9. Page v-6 of the draft report 1nd1cates a re1.nforced concrete faCing fora rock-f1l1 dam 1s another ch01ce although repair to the con:rete faCing requ1resreserv01r draw-down. Before th1s alternat1ve 18 completely rluled out, 1twould seem appropriate to ind1cate how frequent this would have to be done andhow long the concrete facing would last before _jor maintenance was necessary.10. Based. on discuss10ns w1th Mr. Charles Ph1lpott, foanager Western Area -Electr1c, on March 2, 1982, we understand that add 1 t10nal comments w111 beforthcom1ng trom ~.Thank you for the opportun1ty to cOlDlllent on the feas1b1lity report. WebeHeve the joint .. eting with the Metlakatla Indan Council 18S veryinformat1ve and well worth the t1me and effort.lJ.lt.~.Y. j.~Allan K. JOIStOperat10ns Field Representat1veREA

Harza Engineering Ccmpa.nyAttention: Yr. Gene Kocinian150 South Wacker DriveChicago, Illinois 60606Dear Mr. Kocinian:UNITED STATESDEPARTMENT OF THE INTERIORBUREAU OF INDIAN AFFAIRSJuneau Area OfficeP. O. Box 3·8000Juneau, Alaska 99802March 16, 1982HARZA ENCINE£RlNG co .~ate Received~,: .:=.d To.::1:·,,;1 !Jr fUing b,~:.)~1 HI1::~arC •. L;~,::1:~Jl.J/;9/f~The Bureau of Indian Affairs, Roads Section, reviewed the Walden Pointroad file and found three or four field surveys were canp1eted between1967 and 1970. The contilDl1ng centerline to the powerhouse was verysteep, difficult and questionable, due to tallis slide paths.Enclosed you will find xeroxed copies of field pictures; a typical cutsection; earthwork canputations (of the latest field survey); engineersesti.nB.te (tased on 1968 costs) and general mp showing road constructedto date.Gene, if you recall, I said our last rwte would require the followingideas in addition to the enclosed engineers estin:a.te:1. 1,800 lineal feet retaining wall2. 1,800 lineal feet of waterline relocation3. 1,800 lineal feet of rock excavation4. UDknown - tallis slide path controlAt this time tbe BIA, Roads Section, would e1imdnate items 200 (3); 310(3); 317 (1); aDd 317 (3). Paving roads in Alaska is expensive as anor1&1D&l first cost, rut this cost is multiplied lIII.IlY tiDes when mint~nance starts and the remote carml1ni ties just do not have the necessarytraffic camt to support this coostruction.

2My staff estilrates the BIA route would exceed 1.75 million dollars attodays ooostruction costs.If we can be of furtber service, please call the Roads Section at:586-7386.Sincerely,~.c c..f' ~.-tf(...1-e .. ,,/~, (i:~', )QUef, Roads Sectioncc:S. E. AgencyChief. DiVision of. Special ServicesQUe!. BranCh of Econcmi.c Devel()J;:ll:ent

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CHESTER\LAKE-BEGINNING OF\,\I 12+00END OF PROJECT61+50.../~PPROVED

STATEof ALASKA M£MIJIlANIJI. :ff(,.......~ ,-'-~ ... ~('RECEIVEDTO:rBrent Petri e,~1aska Power Authority/George Matz, Program AnalystFROM:Division of Budget and ManagementOffice of the GovernorDATE:FilE NO,TELEPHONE NO:SUlUfCT,March 16, 1982···t261~--- .ALAt:'v~ !)"'lJ'~_" - •. l '-.~:. AL'~.'" 1 •••'t, , 1Chester Lake Feasibility StudyThank you for sending a draft report of the Chester Lake Hydroelectric Projectfeas i bi 1 i ty study. You previously requested that Budget and Managementprovide comments on draft reports to provide greater assurance that the finalcopy will have no Significant deficiencies relative to the review process.The purDose of this memo is to provide such comments. However, this memoshould not be considered as the review required by Budget and Management.Generally speaking, the draft feasibil Hy study provides the type ofinformation that is required. However, there are some areas which should beimproved to assure compliance. These are:IIIBaseline DataA. Although the Triangle Lake Project is not the preferred alternative,some of the data is too general for a feasibility study. No averageannual runoff data is provided and it is not clear that TriangleLake would receive the same precipitation (because of rain shadows)as Purple Lake. Also the environmental data is cursory. Statementsregarding minimal stream flow to protect fisheries, location ofeagle nests, other habitat consideration and possible archacologicalsites need to be supported with data.B. The feasibility report does not mention whether stream gages havebeen installed in the outlet of Chester Lake. Although it seemsreasonable to use Purple Lake data to estimate runoff for ChesterLake, actual data would be desirable.Energy DemandA. The demand projections and net energy balance provide goodinformation to support demand projections. One factor brought outis the influence of federal spending (BIA funded hatchery and HUOfunded housing) on the development, and energy demand, ofMetlakatla. Although federal spending estimates always have anelement of uncertainty, the likelihood of federal funds may be morecertain than portrayed by the draft feasibility study.

Diesel Generation System1.II.Investment CostsA. Generation1. Assumptionsa. Economic life of diesel generatorsb. Installation costs (Skw)c. Inflation rated. Reserve margin2. Annual cost dataa. Peak demand - kwb. First year capacityc. Expanded capacity - kwd. Expanded capacity - (SOOO)e. Replaced capacity - kwf. Replaced capacity - ($000)g. Total capacity - kwh. Total costs - (SOOO)B. Transmission and Oistribution1. Assumptions ..a. Number of miles of transmission line categorized by type ofterrain and with and without road access.b. Cost per mile of transmission line (including poles, fixtures,overhead conductors and devices) for each category.2. Annual cost dataa. Right of way acquisitionb. Transmission line installationc. Substations .d. Distribution system upgrade, if applicablee. Total costsOperation and Maintenance CostsA. Generation1. Assumptionsa. Inflation rateb. Ffxed costs - $/kwc. Variable costs - t/kWh2. Annua 1. cost dataa. Fixed costs - (SOOO)b. Variable costs - (SOOO)c. Total costs - (SOOO)B. Transmission and Distribution1. Assumptionsa. Inflation rateb. Cost variances due to terrain and access2. Annual cost dataa. Fixed costs - ($000)b. Variable costs - (SOOO)c. Total costs - (SOOO)

III. Fuel CostsA. Assumptions1. Assumpt ions2. Base price for fuel oil3. Fuel escalation rate4. Efficiency - kwh per gallon of fuel oilB. Annual cost data1. Diesel net generation - MWh2. Fuel oil used - gallons3. Price of fuel oil - $/gal.4. Fuel Cost - ($000),"

Hydroelectric ProjectI. Investment CostsA. Generation1. Assumptionsa. Economic life of projectb. Construction start-up datec. Construction completion dated. Inflation rate during construction2. Construction costsa. Nominal costs for each year of construction3. Other generation systemsa. In addition to the hydroelectric project, other generationsystems may be needed to meet demand or reserve requirements.The investment costs for supplemental generation systems shouldbe presented separately under the respective system.B. Transmission and Distribution1. Assumptionsa. Number of miles of transmission lines categorized by type ofterrain and with and without road access.b. Cost per mile of transmission line (including poles, fixture~,overhead conductors and devices) for each category.2. Annual cost dataa. Right of way acquisitionb. Transmission line installationc. Substationsd. Distribution system upgrade, if applicablee. Total costsII.Operation and Maintenance CostsA. Generation1. Assumptionsa. Inflation rateb. Fixed costs - $/kwc. Variable "to.sts - ¢/kWh2. Annual cost dataa. Fixed costs - (SOOO)b. Variable costs - (SOOO)c. Total costs - (SOOO)3. O&M ccrsts for other generation systems, needed to supplement thehydroelectric project, s~ould be presented separately under therespective systems.B. Transmission and Distribution1. Assumptionsa. Inflation rateb. Cost variances due to terrain and access2. Annual cost dataa. Fi xed costs - (SOOO)b. Variable costs - (SOOO)c. Total costs - (SOOO)

II 1. Fue 1 Cos tsA. Assumptions1. A hydroelectric project may need supplemental generation to meetpeak and/or energy demar.d. If the supplemental generation systemuses fuel, the fuel costs are to be included in total costs.Fuel costs include the following:a. Fuel consumption needed to meet thE difference between annualenergy demand and average annual energy generated from thehydroelectric project.b. Fuel consumption needed to meet the difference between seasonalenergy demand and seasonal variations in the capacity of thehydroelectric project excluding differences described in (a).B. Annual cost data1. If fuel costs are incurred, the costs should be presentedunder the respective generation system.IV.Reserve CapacityA. Assumptions1. If the hydroelectric project is the largest generating unit for aservice area, reserve capacity equal to the lessor of peak demandor the projects installed capacity is generally needed to assurefirm power. (Interuptable rates can reduce the amount of reservecapacity that is needed). Consequently, the capital, operation an~maintenance, and fuel costs of the reserve capacity are to beincluded in total cost estimates.B. Annual cost data1. The costs for reserve capacity are to be included under thegeneration system that ;s to be used for this purpose ...

Mr. George MatzMay 18, 1982Page 2IV.VA.While there would be some-short term job potential inweatherization we feel lifestyle changes are a more significantfactor in heating energy utilization and, therefore, we do not planto have the consultant estimate the number of short term jobs.Economic EvaluationA. We will prepare a summary sheet of costs and assumptions forthe final report in a manner similar to the example.B. Chester Lake would still be used as a water supply as it hasfor many years. Since the project would not provide a newwater source nor affect the aIM costs of the existing systemor an alternate system and since cost was a consideration inour contract with the consultant, we did not conduct furtherevaluation of the water supply at Chester Lake.C. A major refurbishing of the Purple Lake plant was scheduledfor the year 2011 of the economic analysis. This is explainlQon page IV-2 of the draft report and is reflected in higherfixed costs for Purple Lake hydro beginning in year 2011 ofthe economic analysis.D. The transmission system from this project is only one-halfmile long and may last more than the twenty year period ofanalysis. Your suggestion is well taken and will beconsidered in the final report. You might also note that wereplaced the reserve diesels every twenty years in thepreferred plan. This would tend to artificially increase thecalculated cost of the preferred plan. In actuality reservediesels should outlast diesels that are used for continuousgeneration.We did not make the normal draft distribution of this report sinceMetlakatla has already applied for and received an exemption fromthe Federal Energy Regulatory Commission licensing for this projectand has obtained the necessary permits to construct the project.The Corps of Engineers 404 permit required extensive agencycoordination prior to issuance. The significant difference fromthe 1977 feasibility report and this report is in the powerhouselocation and cost estimate. However, these changes did not resultin significant differences in environmental concerns or impacts.The state library and agencies will receive a library copy of thefinal report.VB. We conducted a public meeting in Metlakatla on February 18, 1982which twenty three people attended. As a result of that meeting wedirected the consultant to examine the effects of road access

Mr. George MatzMay 18, 1982Page 3elimination on cost and to analyze a low dam run-of-the riverconcept and compare it to the storage project. These analyses willbe included in the final report.Thank you for your comments on the draft report. They have beenhelpful in preparing a thorough and complete final report.BNP:mlj

MEMORANDUMTO:Brer.t PetrieAlaska Power Authority334 West Sth AvenueAnchorage, AX 99S01DATE: April 22, 1982PHONE: (907) 886-6661jFROM:Warren B. Dorland,Metlakatla Power &Lake Feasibility St~~1Thank you for your diligent personal assistance for the Alaska Power Authority inmoving the Chester Lake Hydroelectric Project Feasibility Study along to it'snear completion: This study being a sta~utory requirement of the State of Alaskaprior to it's financial contribution andcarticipation in the implementation ofthe Project Design and/or Construction. A consensus summary of comments emergingat the Metlakatla governing bodies meeting held February 18, 1982 was that:1. The project as recommended by Harza was desirable and satisfactorytechnically.2. That a financially ~rec do~m Project should be inclded in theFeasibility Study final fOrLl as funds might not be available forthe Project at an estimated cost of approximately 16 milliondollars. (U. S. )3. That alternatives studied for recommendation by Harza, the selecteeen~ineers, should incluce smaller ca?acity Chester Lake storage anda run-of-the-river type ProJect...Contract No. CC08-2269, dated October 21, 1981, between the Alaska Power Authorityand Harza Engineering Company for the Feasibility Study with the appendix B-1,Scope of services, in CC 08-2269 amendment, number two seems adequate in scope forthe Feasibility Study's purpose. And the scope contains sufficient specifics.Comments by all parties on the Draft Study are addressed.1. Metlakatla Governing Bodies & Officers2. R. E. A. Officials3. Metlakatla Power & Light Board & Management4. Other interested persons.S. Diyision of Budget & Management, Office of the GovenorWe in Metlakatla are anxiously anticipating the final version of the FeasibilityStudy, due out May IS, 1982.

MEMORANDUMState of AlaskaTO:Mr. George MatzProgram AnalystDivision of Budget andManagementDATE: May 18, 1982FILE NO:FROM:Brent petrie#Project ManagerTELEPHONE NO:SUBJECT:Chester LakeFeasibll ity StudyThank you for your comments of March 16, 1982. In response to yourmemo we have the following. The numbering corresponds to those of yourmemo:IA.lB.II.BASELINE DATA - You are correct that the data on Triangle Lakeis much more general than that for Chester Lake or Purple Lake.The lake and watershed were visited by project engineers andgeologists, and was examined from the air by hydrologists andfishery specialists. Even under the most favorableenvironmental and hydrologiC conditions this alternative providesmore costly energy than Chester Lake and was therefore screened outas not as desirable as Chester Lake.There are no stream gages at the outlet of Chester Lake, but thereis a water supply line to the village of Metlakatla and the lakehas been used for hydropower in the past. Since Purple Lake is sonear Chester Lake, and has a similar orientation, and since someidea of flow is available from the water supply operation atChester Lake, I do not believe a gage at Chester Lake would providea significant improvement in the reliability of the extrapolateddata in this case.Energy DemandA. AgreedBand C. We are also aware of the apparent sensitivity of demandto rates in Metlakatla from our review of the draft report. Wealso feel the end use showing the largest response to rate changesis electric space heating. We have instructed the consultant toaddress this issue in the final report with special attention toalternative space heating modes.III. AlternativesA. Conservation was considered by reducing the per customer demandin the load forecast. Items one and three will be considered inthe final report. Since much of the housing stock in Metlakatla isrelatively new and, from testimony at the public meeting, is alsowell insulated, we feel most of the conservation measures inMetlakatla will result from changes in energy use habits inresponse to rates rather than structural or insulation additions.

APPENDIX E

APPENDIX ECHESTER LAKE PROJECT - DATA(2.5 MW - El. 885)I.II.Capital CostsA. Generat ion1. Assumptionsa.b.Economic Life of ProjectConstruction Start-up Datec. Construction Completion Dated. Interest During Constructione. Base Year for Estimates2. Construction Costsa. Yearb. Capacity Additionc. Capital Cost-Generation Only3. Other Generation ComponentsB. Transmission and Substations1. Assumptionsa. Lengthb. Cost per milec. Base Year for Estimates2. Facility Additions and Cost Dataa. Year Constructedb. Right of Way Acquisitionc. Transmission Line Installationd. Substation and Transformere. Total Capital CostsOperation and Maintenance CostsA. Generation1. Assumptionsa. Base Year for Estimatesb.c.Fixed CostsVariable Costs2. Annual Cost Dataa. Yearb. Fixed Costsc. Variable Costsd. Total CostsB. Transmission and Substation50 yearsJanuary, 1983January, 1985See FinancingPlansJanuary, 19821985 on-line2,500 kWS12,902,000lJSee main report0.5 milesS190,000lJJanuary, 19821984NoneS95,000lJS143,0001/S238,0001/1982S26/kWSO/kWh1985S65,000S65,000Included above!/ Including contingencies, engineering and owner's cost.

APPENDIX E (Cont'd)CHESTER LAKE PROJECT - DATA(2.5 MW - El. 885)III. Fuel CostsA. Assumptions1. Diesel Fuel Cost2. Cost per kWhIV.B. Annual CostsReserve Capacity$1. OS/gal.$O.09/kWhSee main reportSee main report

- 2 -B. Metlakatla has demonstrated sensitivity to price increases inelectricity. Assuming that the marginal costs and price foradditional capacity will be higher than existing costs and price,more thorough analysis of price elasticity should be included in thefeas i bi 1 i ty study. The draft study seems to acknowi edge pri ceelasticity by projecting a slight decrease is per customerconsumption but the rationale needs further development.C. The effects of electric space heating deserves more detailedevaluation. Does residential e1ectric space heating result inhigher peak loads requiring more reserve capacity and/or dieselgeneration? How can these peak loads be reduced? The recentdependence on wood stoves to partially meet space heating needs ismentioned but how can wood stove be used to reduce peak demand andelectric costs? Should other strategies, such as demand metering.firewood harvesting or conservation be part of a comprehensive powerplan? Also, if larger buildings convert to electric space heating.what will be the impact on peak demand?III AlternativesIVA. The potential for energy conservation was not considered. Althoughlocal options for energy conservation are not often a significantfactor in the electric demand of rural villages, Metlakatla is anunusual case because of its extensive use of electricity for spaceheati ng. The opportuni ti es and economi cs of energy conservati onshould be discussed as part of the base case or as a separatealternative. (Perhaps energy conservation would be a more viablealternative than the Triangle Lake Project.) This would requiresome estimate of the heat retention of the existing housing stockand the magnitude of reductions that can be economically achieved.The potential for using heat pumps should also be discussed as partof an energy conservation plan. Significant questions which shouldbe addressed includes;1. Can energy conservation make a Significant contribution toMetlakatla energy needs?2. Will conservation practices create short term job opportunitiesfor the residents of Metlakatla?3. Does reduction in energy demand, via conservation, affect thetiming as to when the Chester Lake project should beconstructed?Economic EvaluationA. The economic evaluation may include all costs but some costs andassumptions are not explicit. Attached are examples of what costsand assumptions should be mentioned in the feasibility study.

- 3 -vB. Under the preferred plan, it appears as if Chester Lake would stillbe used as Metlakatla water supply. Would any additional benefitsaccrue because of this? If so, these benefits should be estimatedand treated as offsets to the cost of the Chester Lake Project.C. It appears that the economic analysis assumes that Purple Lake willcontinue to operate throughout the 50 year life of the Chester LakeProject. Doesn't this exceed the economic life of the Purple LakeProject? What refurbishing costs are needed to extend the economiclife of the Purple Lake Project?~.,AD. APA criteria assumes that the economic life of a transmission line.",.J>~is 20 years. Are replacement costs for the transmission line --~included? Perhaps it would be more realistic to assume that thetransmission line will last the life of the project with replacement ... /costs included under Operation and Maintenance costs. ~ ~.E. APA regulations require that the present costs analysis extend over ~ ,,11Reviewthe economic life of the project. Since the base case includes . 1'1': Jdiesil generation, which has a 20 year economic life, the present ,-~ ~costs for a 20 year period should be included in the economic Ii' p: ~ .analysis.~ IA. The distribution list for the draft study did not include allinterested state or federal agencies. These agencies should also begiven the opportunity for review.B. A public meeting is required for reconnaissance studies. Since thereconnaissance study for Chester Lake is rather dated and completedbefore this requirement, it would be desirable to conduct a publicmeeting in Metlakatla on the draft study. The final report shouldinclude relevant comments.Thank you for the opportunity to comment on the draft feasibility study.Hopefully, these preliminary comments will result on a more comprehensive andacceptable final version. As previously stated, the questions brought out inthis memo should not be interpretated as Budget and Management review of thefeasibility study.r

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