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Home My WebLink AboutAEA Takotna Micro Hydro Investigation 1991-1f1HO 001 . . ~./ - r r I r - • -I LIBRARY COPY DO NOT REMOVE l : 0 .. : • ..... . •, Takotna Micro-Hydro I nvestlgatlon .. ..- Walter J. Hickel, Governor • • • •::,.• • ~··· ,. I ... , . Charlie Bussell, Executive Director .. . ...... I ~ r - Takotna Micro Hydro Investigation Prepared for State of Alaska Walter J. Hickel, Governor Alaska Energy Authority Charlie Bussell, Executive Director 701 East Tudor Road PO Box 190869 Anchorage, AK 99519 (907) 561~7877 November 1991 Prepared under contract No. 2800432 by: Eagle River Engineering Services P.O. Box773294 Eagle River, AK 995n FIGURE 1 2 3 4 5 6 7 8 LIST OF FIGURES PROJECT LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 TAKOTNA AERIAL VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 GOLD CREEK .................................... 11 ESTIMATED AVERAGE MONTHLY FLOWS ................ 14 FLOW DURATION CURVE ............................ 15 PROJECT COMPONENT LOCATIONS . . . . . . . . . . . . . . . . . . . . . 19 DIVERSION SECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 AVERAGE MONTHLY ENERGY PRODUCTION . . . . . . . . . . . . . . 21 TABLE 1 2 3 LIST OF TABLES POTENTIAL ENERGY PRODUCTION . . . . . . . . . . . . . . . . . . . . . 22 POWER PRODUCTION AND FUEL CONSUMPTION SUMMARY ... 24 COST ESTIMATE SUMMARY .......................... 26 EXECUTIVE SUMMARY The U.S. Public Health Service (USPHS) and Takotna Community Association, Inc. have recognized the micro-hydroelectric potential of Gold Creek. This study was initiated by the Alaska Energy Authority (AEA) to explore the feasibility of utilizing this hydroelectric potential as a supplemental power source to the present diesel generation. Gold Creek is ideally located, traversing through the center of Takotna.. Hydrologic analysis, utilizing records from a similar drainage basin, have predicted a widely varying flow range with an estimated average annual flow of 3.8 CFS. The project is considered a low head project with a possible gross head of 50'. Due to the varying flow rates, and low head expected, power production would be 3 kW in Winter low flow months and up to 18 kW during five peak flow months. If all power is utilized, this would result in an estimated annual power production of 67,506 kWH. The project development cost utilizing Little Davis Bacon wages is estimated at $378,434.00. The cost worksheet is listed in Appendix I, and the total cost includes design, contingencies and construction inspection. This cost does not include permitting or cost of construction financing. The Takotna Community Association, Inc., presently provides power utilizing a 50 kW diesel generator in the Summer, an4 switches to an 85 kW generator during high demand Winter months. Electrical demand is not expected to increase significantly in the near future. Micro- Hydroelectric power may be able to allow generator downsizing during Summer operations, with resultant diesel fuel cost savings. The economic feasibility of the Gold Creek micro-hydroelectric project will depend largely on reducing capital costs and possible USPHS participation. -5 - 1.0 PROJECT DESCRIPTION 1.1 LOCATION Takotna (aka Berry Landing, Portage City, Takotna City, Takotna Station and Tocotna) is located on the North bank of the Takotna River, 17 air miles West of McGrath in the Kilbuck- Kuskokwim Mountains. It was founded in 1908 at the farthest point served by stemwheel service. It served as a supply center to gold mining in the area; by 1919 there were several commercial companies, roadhouses, a post office, and by 1923 a radio station and newspaper. Gold mining operations declined in the 40's and by the late SO's only the post office, roadhouse, and U.S. Bureau of Public Roads remained as commercial operations.'!" 1.2 GOVERNMENT Takotna is not incorporated as a municipality under state law. It is within the Unorganized Borough and is therefore also without a regional government. The traditional council represents Takotna's Native population, and is recognized by the federal government as the official tribal governing body of a village. The traditional council is eligible to administer a variety of federal programs, including local health care, employment assistance, social services, and tribal operation. In response to the need to have a representative body which answered for the town's non-native populace as well as Native residents, the Takotna Community Association was formed. The association owns and operates the local electric company. 1.3 TRANSPORTATION Takotna is served by two airports: the local 2,000' x 80' Takotna airport and the Tatalina Air Force Station airport 10 miles southeast of town by road. Scheduled service to the local airport is made by mail planes from McGrath. The gravel strip is terraced into the side of a mountain above town. The gravel airport at Tatalina accommodates aircraft large enough to carry heavy equipment, building materials, vehicles, and household items. Upon approval of the base commander, residents may have such shipments flown in. Fuel is shipped by barge to Sterling Landing on the Kuskokwim River, 24 miles southeast of Takotna by road. Fuel is stored in tanks at the landing and hauled by truck to the community. Residents use private boats for recreation, fishing, and hunting in the Takotna River. There are two miles of community roads as well as an additional 80 miles of out-of-town roads that lead to the Air Force station, Sterling Landing, and existing gold mines. In addition to the -6- road system, there are trapping trails and woodcutting trails, as well as cat trails to McGrath ( 17 miles) and to Ophir mines (30 miles). Takotna is a checkpoint on the 1,049 mile Iditarod Trail used annually be dogsled racers. 1.4 ECONOMY Takotna has a combined cash, subsistence economy. Unlike other communities in the region, Takotna is connected by road to an Air Force Station (Tatalina) which provides job opportunities to local residents. Although the base closed down its White Alice communications system in 1978, and is phasing out many of its operations, it employs 10 (1991) residents from Takotna. On a local basis, community residents are employed by the school, post office, clinic, USPHS washeteria, and cafe and bar. About 80 percent of the people_in Takotna are involved in subsistence activities. Native residents of Takotna are shareholders in MTNT, Ltd.. MTNT, Ltd. is a village corporation formed as the result of the merger of four Kuskokwim River village corporations (McGrath, Nikolai, Takotna, and Telida) which were originally incorporated in accordance with the terms of the Alaska Native Claims Settlement Act (ANCSA). Many of its investments are managed by its two subsidiary corporations, McGrath Light and Power and Vinasale Enterprises, Inc. which have their principal offices in McGrath. 1.! POPULATION The population of the town has fluctuated between 35 and 87 residents over the last ten years. A study accomplished by the Alaska Power Administration showed census figures of 50 residents in 1970 and 1979 with a prediction of zero population growth. 1.6 LAND STATUS In the area immediately surrounding Gold Creek, aka Gold Run Creek, and its tributaries affecting the hydroelectric installation: ANCSA Plat 90-2: Lot 18 State of Alaska, Municipal Land Trustees USS 4105, Lot 3 Takotna Community Association ANCSA Section 14 (c) Tracts Sheet #1 P.L. 92-203 STAT 688: Lot 2 Eep Anderson Lot 4 Pudden Anderson Lot 5 Dave Miller -7- Watershed T34N R36W of Seward Meridian Section 34 excepting above listings Section 33 Section 32 T29S R14E of Kateel River Meridian Section 1, 2, 3 Section 4 T28S R14E of Kateel River Meridian Section 34, 35, 36 T27S R14E of Kateel River Meridian Section 25, 26, 27 T29S R 15E of Kateel River Meridian Section 4, 5, 6 1.7 WATER RIGHTS MTNT, Ltd./Doyon, Ltd. MTNT, Ltd. Federal/State Selected Federal/State Selected MTNT, Ltd./Doyon, Ltd. Doyon, Ltd. Doyon, Ltd. · MTNT, Ltd./Doyon, Ltd. The Takotna Community Association owns the only existing water rights on Gold Creek, LAS 9670. It allocates 2 CFS for a proposed fish hatchery on USS 4105, Lot 3. The USPHS intends to apply for water rights to provide a drinking water supply for Takotna. Estimated water usage is 1,500 GPD. 1.8 GENERAL GEOLOGY Information on local geology is very limited. A survey accomplished by the U.S. Soil Conservation Service describes the drainage basin soil as "McGrath silty loam". USSCS Mapping Unit 173C: McCally flaggy silt loam, 7 -12 percent slopes. The soil is assigned to capability subclass VIle. "The McGrath series consists of well drained soils developed in deep silty loess over bedrock. These soils occur on South-facing slopes of rolling to steep uplands. They have no permafrost. Typically, under a few inches of partially decomposed forest litter, the soils have a thin gray silt loam horizon over a dark brown and dark yellowish brown silt loam horizon about 10 inches thick. The substratum consists of streaked gray and brown silt loam that is more that 3 feet over bedrock." - 8 - PROJECT LOCATION FIGURE l -9- TAKOTNA FIGURE 2 -10- GOLD CREEK FIGURE 3 -11 - There are no engineering soils reports available for the area of powerhouse, dam or penstock route. Local excavator interviews revealed that excavation for the USPHS water line had 0-1' organic, 1' -6' silty loam soil of limited permeability, 6' -10' coarse gravel. The same conditions are assumed for our conceptual estimates. 1.9 HYDROLOGY There are no consistent USGS gaging records for Gold Creek. The USGS established a crest- stage gage on Gold Creek in 1987. Annual peaks have been recorded for four years and individual discharge measurements were taken at five separate dates and are listed in Appendix v. The drainage basin area above the damsite, as determined from the USGS Index of stream flow and water quality records of September JO, 1988, is 6.31 square miles. Records for Gold Creek are insufficient to use as a guide in estimating the flow for hydroelectric purposes. Only estimates of the stream flow based on precipitation and runoff data from nearby watersheds and verified by local observation of stream flow in Gold Creek are available. Correlation studies were made with USGS readings on Ophir Creek approximately 13 miles Northwest of Takotna where rainfall may be expected to be similar to that of Takotna. The average annual flows for the 5 years of record on Ophir Creek was 3.8 CFS from a 6.19 square mile drainage area. As the Gold Creek drainage area is 6.31 square miles, it was felt that a direct correlation could be made for estimating purposes. Ophir Creek has similar upper drainage basin characteristics, however, the lower area has been heavily mined which may have affected discharge readings. A peak discharge reading in 1977 of 360 CFS is suspected of being in error and was removed from our flow duration calculations. Ophir Creek does experience zero flow or total freeze up during December, January, February and March. Gold Creek is noted by local residents as having an estimated Winter low flow of approximately 1.2 CFS under a 4' maximum ice cover. Ophir Creek recorded flows of 0 CFS were adjusted to a minimum of 1.0 CFS for the purpose of establishing monthly flow rates for Gold Creek. Comparative discharge measurements of Gold Creek and Ophir Creek were made on September 21, 1991 with discharge totals of 4. 75 CFS and 3.9 CFS respectively, confirming our estimate of close correlation between discharge records. USGS gaging records for Ophir Creek are listed in Appendix VI. Extremely small stream flow may occur during extended near-zero weather or dry periods. Extremely large flows occur in Spring, when rain speeds snow melt, or after heavy rains during the wet months. The upper watershed is relatively flat, contains tundra mat and peat accumulations in low lying areas, all of which tends to slow the runoff. Estimated monthly flow rates and flow duration curve, as synthesized for Ophir Creek gaging records, are provided in Figures 4 and 5. -12 - Further Study It is recommended that Gold Creek be reliably gaged during the low flow Winter period December • March. -13 - Year 1976 1977 1978 1979 1980 5 Yr. Avg 5Yr. Median Flow U"l -< n:> 0 ~ ~ n:> ~ 0 ..0 n:> ...,., 0 =e (") ...,., 0 Jan Feb 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 2.0 2.0 1.2 1.2 1.2 1.2 12.0 10.0 8.0 6.0 4.0 2.0 Estimated Average Monthly Flows Gold Creek Mar Apr May Jun Jul Aug 1.0 1.8 12.1 6.2 2.2 1.3 1.0 0.7 19.3 6.8 4.5 2.5 1.0 1.0 2.5 8.8 7.2 6.1 1.0 0.9 8.8 8.1 8.8 5.9 2.0 3.0 10.9 14.1 10.5 9.5 1.2 1.5 10.7 8.8 6.6 5.1 1.2 1.3 9.5 8.1 6.4 5.9 Estimated Monthly Flows 0.0~_;.;;,.;.-f--"~ Sep Oct Nov 1.7 3.5 1.2 8.0 1.0 1.0 4.7 3.7 0.5 5.7 2.0 0.7 7.2 4.3 2.1 5.4 2.9 1.0 5.4 2.9 1.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec . Month FIGURE 4 -14- Dec 1.3 1.0 1.0 1.0 2.0 1.3 1.3 jFIGURE 5 GOLD CREEK· FLOW DURATION CURVE! 100 90 0 LI..J 80 0 LI..J LI..J 70 u >< LI..J 60 3: 0 so -...1 I.<- LI..J 40 ::I! ~ 30 I.<- 0 20 0'-e 10 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 20 22 24 26 28 30 32 34 FLOW (CFS) -15 - 2.0 HYDROELECTRIC ALTERNATIVES 2.1 INTRODUCTION Takotna presently receives all of its power production from diesel generation. It is the intent of this study to determine if sufficient power can be produced to beneficially supplement the diesel power production. As this is a micro-hydro project, it had been pre-determined that the hydroelectric power will not replace diesel power generation in Takotna. The reduction of generator requirements, however, would result in increased fuel savings. 2.2 DIVERSION Two potential intake sites were investigated for this project, designated Diversion Site # 1, and Diversion Site #2. As there is a limited gradient available of Gold Creek, it was desirable to maximize head within a practical penstock length. The two diversion sites, selected for this study, represent the two sites allowing the shortest diversion weir section. An energy analysis has determined that Diversion Site #2, gaining an additional13' of head with 660' of additional penstock, would be the most cost effective alternative. The creek gradient reduces considerably above Diversion Site #2 making further head gain impractical. The diversion structure would be designed to provide a water intake, increase operating head, provide small impoundment and allow for protective ice cover. As this is a micro-hydro project, diversion cost must be kept to a minimum. Two alternatives were explored for a diversion structure: A. Sheet pile weir B. Gabion or bin wall structure The sheet pile diversion would consist of a 10' high structure with an overflow spillway section. The crest elevation of the overflow section, 26' width, was set at elevation 145.5', 2 feet below the non-overflow sections, allowing for a spillway capacity of 200 CFS. A sluice gate would be installed to allow draining of the reservoir and intake maintenance. Sheetpile can be driven, possibly utilizing an on-site cable tool well rig or a vibrating driver mounted on a backhoe. Rock backfill would be required on either side of the structure for support and erosion protection. Rock is available from Candle Mountain at approximate cost of $125/yard delivered by truck. The gabion or bin wall structure was proposed by PHS as an intake for their public water supply. This would also~ be adequate for a micro-hydroelectric intake if made fairly impermeable. It is expected that ice cover could reach a depth of 4', requiring a minimum pool depth of 8'. The impoundment area for the above described diversion structure is estimated at 14 acre-feet. The crest length of the weir is estimated at 130' for Diversion Site #2 as determined by a cross section survey. From conversations with local contractors it is expected that there is a silty clayey overburden material from 3' -6' from ground surface underlain by well graded gravel to bedrock. Bedrock depth has not been determined, however, excavations to 12' have not revealed bedrock in the immediate area. 2.3 INTAKE WORKS The deepest section of the diversion would be penetrated with a 16 inch wrought iron pipe with the upstream end flared to reduce the velocity of approach and a trash rack welded over the opening. A 16 inch butterfly valve will be installed on the downstream side of the dam. 2.4 PENSTOCK Water power flow would be conducted from the dam to the powerplant via a 16 inch HDPE pipe with butt fused joints. HDPE pipe is preferred due to the low pressure requirements and resistance to freeze damage in the possibility of Winter shutdown. The penstock would be approximately 1,710 feet in length and would follow the North bank of Gold Creek to the powerhouse site on Lot 4105. The penstock will be buried 4' -6' through most of its length and follow a uniform gradient. Access to the penstock route would have to be constructed as part of the penstock trenching. 2.5 POWERHOUSE AND TURBINE The proposed powerhouse site is located on land owned by the Takotna Village Association near the comer of Lot 4, USS 4105. The building was assumed to be an insulated wood frame building on a concrete foundation placed on gravel soil at elevation 100.0. The tail race/draft tube will require excavation to approximate elevation 95.5 to take advantage of the additional head created by a draft tube. This will require an easement onto ANCSA, Lot 18. The powerhouse would be located to provide maximum power, while protecting it from expected high water levels and glaciation. The powerhouse would contain a 20 kW Crossflow type turbine generator unit. Due to the large fluctuations in flow, and therefore net head, the Crossflow is the most practical turbine choice. The generator is to be a synchronous "stand alone" type generator with electronic load control generator and paralleling electrical hookup to the grid system. While synchronous generation is more costly than induction generation, the downsized diesel generator can not be relied upon to provide sufficient reactance to control the induction motor during maximum power output. -17- 2.6 POWER TRANSI\1ISSION All generated power is to be fed into the grid system to supplement diesel generation requirements. The powerhouse site is located 220' from the utility power lines. Transmission line expense is expected to be minimal utilizing overhead or buried service lines. -18 - LOT 16 -19 - DIVERSION 1/2 SEE flCURE 7 ~--147.5- LOT 18 ALT. DIVERSION # 1 u.s.s. 4105 LOT 3 LOT 16 LOT 16 1" = 200' s 14.14'42' ( 35.56 ALASKA ENERGY AUTHORilY GOLD CREEK TAKOTNA. AK HYDROELECTRIC POWER POTENTIAL DRAWN BY: DATE: FIGURE 6 11-12-91 N 0 ,. :' ELEV. 147.5 OVERFLOW SECTION ELEV. 145.5 7 GAGE SHEET PILE / DRIVE SHEET PILE FOR RETAINING WALL ON EACH END OF OVERFLOW SECTION. CAP WITH 3 1/2" ANGLE. CENTERLINE' SECTION 2:1 SLOPE .------r---FILL PLACED ON EACH SIDE OF SHEET PILE IN NON-OVERFLOW SECTION NOTE 1. PLACE ROCK RIPRAP ON DOWNSTREAM SIDE Of OVERFLOW SECTION FOR CHANNEL BED PROTECTION 2. CAP SHEET PILING WITH J 1/2" ANGLE WELDED TO SHEETING. DIVER ION OLD SECTION CREEK ~ IGUR[ l 3.0 PROJECT ENERGY PRODUCTION For this project, a crossflow turbine was considered the best alternative. This is based on the large range of flow through which the turbine must operate and the low net head available at the turbine. The predicted range of lows are 1.2-9.1 CFS with a calculated power production of 2.5 -18 kW. A 16 inch penstock was chosen to allow utilization of the maximum power production during high flow Summer months, and to reduce net head fluctuations. The power available during Winter months is minimal and the system could be shut down during these months if maintenance is a concern. The potential energy production is tabulated as average monthly power in Figure 7, and the power production calculations are detailed in Table 1, based on turbine efficiencies utilizing Ossberger manufacturer's literature. Average Mol1thly Power Producticm (kWh) (kWh) FIGURE 8 -21 - TABLE 1 ·ESTIMATED POTENTIAL ENERGY PRODUCTION Useable! Total Head Turbine Generator Total Design Plant Avg. Monthly Local Value of Flow Head Loss Efficiency Efficiency Efficiency Power (kw) Factor Power (Kwh) Power Energy MONTH (C. F .S.) I (ft) (Pipe) Cost Produced Jan 1.2 47 I 0.34 0.75 0.83 0.62 2.95 0.9 1914.03 0.48 $918.73 Feb 1.2 47 0.34 0.75 0.83 0.62 2.95 0.9 1914.03 0.48 $918.73 Mar 1.2 47 0.34 0.75 0.83 0.62 2.95 0.9 1914.03 0.48 $918.73 Apr 1.3 47 0.40 0.75 0.83 0.62 3.20 0.9 2071.11 0.48 $994.13 May 9.5 50 15.67 0.8 0.83 0.46 18.35 0.9 11891.31 0.48 $5,707.83 Jun 8.1 50 . 11.67 0.8 0.83 0.51 17.47 0.9 11321.24 0.48 $5,434.20 Jul 6.4 50 7.55 0.8 0.83 0.56 15.29 0.9 9907.16 0.48 $4,755.44 Aug 5.9 50 6.49 0.8 0.83 0.58 14.44 0.9 9360.00 0.48 $4,492.80 Sep 5.4 50 5.51 0.8 0.83 0.59 13.52 0.9 8759.96 0.48 $4,204.78 Oct 2.9 50 1.74 0.75 0.83 0.60 7.38 0.9 4783.80 0.48 $2,296.23 Nov 1.0 47 0.24 0.75 0.83 0.62 2.47 0.9 1598.36 0.48 $767.21 Dec 1.3 47 0.40 0.75 0.83 0.62 3.20 0.9 2071.11 0.48 $994.13 AVG 3.8 0.6 8.7 5,625.51 TOTALS ' . . >.;.;,;.• .. 67,506 $32,403 Constants: Pipe Length (ft) 1710 1Turbine Efficiency(%) .75-.80 Pipe 10 (inch) 15.02 Generator Eff. {%) 0.83 Pipe Friction Coeff. (H1 155 -22- 4.0 TAKOTNA POWER REQUIREMEN'I' FORECAST 4.1 EXISTING ELECTRICAL GENERATION The present electrical system consists of diesel power generation operated by the Takotna Community Association. Generating capacity is 2 -50 kW, 1 -85 kW and 1 -30 kW generator. The power is distributed through a local above ground distribution network. The 50 kW capacity is utilized 75% of the time with the 85 kW generator utilized in the high demand months of January through March. Power is billed at a metered rate of 48C per kWH with a 0.3183 PCE adjustment. There is a $30 minimum use charge, but no cost to disconnect or reconnect service. Some residents leave for extended periods of time, turning off their power meters. 4.2 PRESENT REQUIREMENTS (September 1991) Residential customers Commercial customers Public Facilities 17 7 7 High Use Month Peak (January 1991) Low Use Month Peak (June 1991) Annual MWH (1990-1991) Annual MWH (1989-1990) homes small commercial gym, shop, PHS, firehouse, community center, library, street lights 47kW 31 kW 117MWH 155 MWH In addition to the present active meters, there are 13 residential and 3 light commercial meters installed that are connected intermittently. There is a proposed vocational wood shop that would be classified as commercial. Electrical generation reports from APUC were reviewed to determine the average annual power production for the years 1987-1991. Average annual power production, kWH sold and gallons of fuel consumed are summarized in Table 2. From the electrical generation reports, it can be seen that there is excess power generated to provide for peak demands which occur on this small generation system. The largest benefit from a hydro plant would be realized by allowing a downsizing of the diesel generation plant. The village association recently purchased a 30 kW generator which they have not been able to utilize due to peak demands exceeding generator capacity. If a hydro plant could provide for peak loads, then a savings could be realized in making use of the 30 kW plant versus a 50 kW plant during low use months. Diesel generation will be required as a back up even if hydroelectric power is provided. -23- Power Produced and Fuel Consumption TABLE2 Time I kWh kWh Sold Fuel kWh/ Fuel Cost Period 1 Generated Consumption GAL. (gal.) 1987-88 137262 17540 $1.20 1988-89 140367 18320 $1.17 1989-90 155532 19274 $1.31 1990-91 177211 20480 $1.24 Jun.91 13043 12202 1510 8.64 $1.47 May.90 13589 12490 1620 8.39 $1.20 Apr.91 15570 13391 1270 12.26 $1.20 Mar.91 15779 17073 1640 9.62 $1.20 Feb.91 18056 15911 1760 10.26 $1.20 Jan.91 18670 16824 1710 10.921 $1.20 Nov.90 24840 21286 2140 11.61 $1.20 Oct90 5195 2050 7.69 $1.20 Sep.90 19275 14874 2050 9.40 $1.20 Aug.90 12528 12212 1110 11.29 $1.26 Jul.90 11024 10021 1510 7.30 $1.26 Jun.90 9141 7810 1580 5.79 $1.34 May.90 15924 12118 1870 8.52 $1.34 Apr.90 14838 12269 1430 10.38 $1.34 Mar.90 17779 15433 1620 10.97 $1.34 Feb.90 22319 17074 2050 10.89 $1.34 Jan.,90 19048 16697 2120 8.98 $1.34 Dec.89 15828 14295 1270 12.46 $1.34 Nov.89 19859 17292 1690 11.75 $1.34 Sep.89 13009 12185 1270 10.24 $1.34 Aug.89 15447 9970 1194 12.94 $1.17 Jul.89 11313 8620 1700 6.65 $1.17 Jun.89 12074 9285 1040 11.61 $1.17 May.89 11921 11879 1220 9.77 $1.17 Apr.89 15176 9954 1450 10.47 $1.17 Mar.89 18053 17245 1670 10.81 $1.17 Feb.89 13127 12624 1560 8.41 $1.17 Dec, as 19678 18619 1650 11.93 $1.17 Nov.87 15890 15675 1450 10.96 $1.20 Oct.87 14623 10852 1400 10.45 $1.20 Sep.87 13689 10778 1440 9.51 $1.20 Aug.87 10137 9840 1370 7.40 $1.20 Jul.87 11182 7723, 1140 9.81 $1.30 Avg .Fuel Consumption = 9.94 -24- 4.3 ENERGY COSTS The village association purchases diesel fuel which is barged to Sterling Landing, trucked to Takotna, and stored in fuel tanks near the generator plant. Previous fuel costs were $1.20 per gallon. Present fuel costs are $1.47 per gallon. 4.4 HIS.TORICAL TRENDS A. Population Growth. It is expected that the population will remain at an average of 50 residents. B. Planned Construction. The additional kW demand and annual MWH consumption from planned public facility construction (vocational wood shop) will cause an increase in present monthly requirements as estimated below: kW 1.5-2 MWH (Unknown) C. Industrial Development. There is no planned industrial development. -25 - 5.0 COST ESTIMATES Construction cost estimate for the hydroelectric generation system described earlier have been prepared. Current bid prices were used as a data base where possible to estimate the physical construction costs. Design engineering costs and construction management costs were competed as a percentage of the construction estimate. Construction management percentage was based on rates utilized for similar projects. Annual operating costs were based on the generating capability of the facility. It should be noted that legal; land acquisition; and administrative costs, other than construction management were not included in the cost estimates and other computations summarized in Table 3. With an increase of fossil fuel prices, the primary benefit in hydroelectric energy is the fuel cost savings. The main economic benefit of this project would be the fuel savings derived from downsizing the diesel generator. If a downsizing of 20 kW were realized, then based on an average fuel consumption of 9.9 kWH/gallon, the fuel savings would amount to 7,300 gallons over the five month high power production period, or $10,700.00 per period based on $1.47 per gallon fuel cost. Additional benefit would be obtained over the remaining nine months by utilizing the hydroelectric energy, however, it is doubtful that this energy can be relied upon to allow diesel generator downsizing. It is estimated that the project has a design life of 30 -50 years and a maintenance cost of $2,000.00 per year. Personnel now employed to monitor the diesel plant could perform routine maintenance tasks and hydro plant adjustments. TABLE3 COST ESTIMATE SUMMARY COST ITEM AMOUNT 1. Acess road $2,400 2. Penstock $42,423 3. Diversion $169,695 4. Intake Structure $9,504 5. Powerhouse $8,680 6. Turbine and Controls $41,500 7. Mech. & Elect. $3,120 8. Transmission Line $3,000 Direct Construction Cost $280,322 Engineering and Construction Management (15%} $42,048 Contingencies (20%) $56,064 Total Project Cost = $378,434 -26- 6.0 RECOMMENDATIONS This report indicates that Gold Creek is a potential micro-hydro power source, however, the potential is limited by the extreme flow fluctuation of the creek. The scope of work for this report does not include a determination of economic feasibility. Due to the limited average power available, the project may not be cost effective unless a means of reducing capital cost is found. The diversion or weir is a large cost item. This may be reduced by alternative damming methods utilizing on-site materials or by the participation of USPHS. Takotna has a need for a new water intake source which could be the hydroelectric penstock. In this case the USPHS may be able to underwrite a portion of the cost to extend the penstock in return for utilizing the penstock as a water source. USPHS could also provide design engineering for intake/penstock portions of the project. A simplified but less efficient turbine may be substituted for the estimated turbine unit. The labor cost could decrease if Little Davis-Bacon wages were not utilized for some portions of the project. -27- APPENDIX I COST F.STI.MA TE WORKSHEET Access Road -utilizing native materials 16 hours (TD20) SUBTOTAL Dmn Clean site 8 hours (TD20) 10 hours Laborer Remove debris 10 hours Dumptruck Drive piling -87 sections 130 hours Backhoe w/ Vibrator 260 hours Laborer (2 @ 130 hrs) Sheet Piling material -7 gauge Hypalon Liner (30 mil) Rock Riprap 1, 100 yd 3 x $110/yd Cap Steel SUBTOTAL Intake Works 16" Butterfly Valve & Fittings Steel Sluice Gate SUBTOTAL Penstock 24 hours Laborer 8 hours Welder 408 hours Laborer (6@ 68 hrs) 70 hours Backhoe 5 hours (TD20) Penstock material cost $10.03/ft pipe in Takotna Fusion Machine (1 month rental) Miscellaneous Fittings SUBTOTAL AI-1 X $150.00 X $150.00 X $27.00 X $50.00 X $90.00 X $27.00 X $27.00 X $32.00 X $27.00 X $90.00 X $150.00 -- - = - - -- = - - = ------- ~ 2,400.00 $ 2,400.00 1,200.00 270.00 500.00 11,700.00 7,020.00 31,705.00 3,700.00 110,000.00 1,200.00 $169,695.00 3,100.00 2,000.00 3,500.00 648.00 256.00 $ 9,504.00 11,016.00 6,300.00 750.00 17,157.00 4,400.00 2.800.0Q $ 42,423.00 Pgw~rhQYS 10 hours Backhoe X $90.00 -900.00 20 hours Concrete Forming X $29.00 = 580.00 (Foundation & Tailrace Concrete 1 Oyd -2,350.00 12 X 12 Wooden insulated structure -4,500.00 2 H Beams 8' -350.00 Turbine & controls = 28,000.00 Electrical connections & switch gear = 13,500.00 Powerline intertie & turbine set up 56 hours Electrician X $35.00 -1,960.00 Transmission line 720' X $15.00/ft -3,000.00 Mobilization time 16 hours Electrician X $35.00 -560.00 Per diem 6 days X $100.00 -600.00 SUBTOTAL $ 56,300.00 GRAND TOTAL $280,322.00 AI-2 Category Ditch Digger Cement Masons Equip. Operator Welder Electrician APPENniX II LABOR RATES -LITTLE DAVIS BACON $/Hr Raw Rate $27.00 $29.00 $31.00 $32.00 $35.00 Overtime Rate $40.50 $43.50 $46.50 $48.00 $52.50 Overhead & Profit Per Day* $ 81.00 $ 87.00 $93.00 $ 96.00 $105.00 Average $/Pay assumes 60 hr week and over time, Little Bacon-Davis wages. $/Day $396.00 $425.33 $454.67 $46.).33 $513.33 *Additional 30% of straight time pay to account for overhead costs and profit. Overhead includes bond, property damage liability insurance, unemployment insurance contribution, social security and other taxes. All-1 APPENDIX ill TAKOTNA COMMUNITY ASSOCIATION, INC. RENTAL RATES (1991) ACTUAL CONSTRUCTION COSTS Labor Backhoe with operator Forklift 10 yd Dump 10 yd Rock Flatbed Mixer Pickup TD-20 $10-15/hr $90/hr $50/hr $50/hr $125/yd to damsite $50/hr $50/day $100/day $150/day Alii-1 APPENDIX IV COST COMPARISON -STORE PRICES Eggs, dozen "Real Fresh" Milk, sm. box Lays potato chips, 11 oz Pennzoil Motor Oil, qt Heet, 12 oz Com Flakes, 24 oz Bumble Bee Tuna, 61h oz Best Foods Mayonnaise, 48 oz Hunts Ketchup, 40 oz Hunts Barbeque Sauce, 18 oz Cold Pop, 12 oz can Takotna $2.00 $1.98 $4.28 $4.59 $3.19 $4.39 $1.55 $6.78 $5.29 $3.97 $1.50 AVERAGE COST DIFFERENTIAL AIV-1 Anchorage $1.59 $0.33 $3.85 $1.29 $0.99 $2.99 $0.99 $4.09 $2.39 $1.65 $0.52 Differential 125% 600% 111% 355% 322% 146% 156% 165% 221% 240% 288% 248% APPENDIXV USGS GOLD CREEK GAGING RECORDS AV - 1 r.Ole :JA.··Jndllox of ac...-flow end -t•r·~llty rec:ords to Sept...oer 30, 1988 • Southwest Alaska··Continued Ia • approximately; C · Crest stage; 0 · Daily] Drainage area ~treamflow Water gual i t:z:: Station locatioo (square Continuous Partial Water identification Name Latitude Long1 tuac-mites~ record record Chemical temperature Sediment Biological 15303600 Kuskokwim River at 62•57 1 10" 155°35'11" a11700 1963·73 1950; 66· 1967·68; McGrath 68; 71·73 70·72. 15303660 Gold Creek at Talcotna 62.59'20" 156°04 1 08 11 6.31 1987· c 6Z5755155362SOO Takotna River near 62•57 1 55 11 155°36'25" 1956·57 McGrath 15303700 Tatalina River near 62°53'06" 155°56'22" 76.9 1987· 1986 c Takotna 614605156354000 Stony River near 61°46 1 05" 156°35'40" 1956·57 Stooy River 614040157095000 Holitna River near 61°40 1 40" 157.09'50" 1956·57 Sleetmute )>' 15304000 Kuskokwim River at 61°52'16" 158"06'03" a31100 1951· 1951; 55·56; 1957·67; 1966· 72.; 1975· < Crooked Creek 57·67 D; 19n·79 75· 68·72; 74· N 613415159302000 Aniak River at Aniak 61·~·15 11 159°30'20" 1956-57 15304200 li:isaral ik River 60°21 1 10" 159.55'0011 265 1979·87 near Akiak 15304293 Browns Creek near 60°48 1 20" 161.49'22" 4.79 1986· 1985 c 1987 Bethel 15304296 Browns Creek tribu· 60•47 1 33 11 161°49'4011 0.28 1985·86 c tary near Bethel 15304298 Browns Creek at Bethel 60•47'5611 161°46'25" 10.5 1986 1986· c 15304300 luskokw1111 River 60•47•30" 161°45'00" 1955; 71 at Bethel United States Department of the Interior GEOLOGICAL SURVEY wat•~ ~aoureee Division 4230 University Drive, Suite 201 tlell Huffman 3 Mil .. Hill Takotna, Alaska 99675 Dear He. Huffman, ANCHORAGB, ALASKA 99508-4614 March 19, 1991 " The u.s. Geological survey has collected very little data on Gold Creek near Takotna. A ereat-stage gage was eetabliehed in 1987 about 450 feet upstream from the bridge at Takotna. Peak diechargea lollow: Sept. 6, 1987 May 17, 1988 May 1, 19U 42 cubic feet per eecond 46 cubic feet per ~econd 47 cubic feet per 1econd A few current-meter meaeurementa have been made, but they would be of little uae in determinin9 mean flowe. IUJL/ewa AV -3 Yater Resoure~s Division Anchorage field Offlc• 1219 Orca Street Anchorage, Alaaka 99581 U.S. PublJ.c: Hfrc1lth Sf!t·vJ.ce 7.22 l.ole<!il: 8th 9tt·oet 165 A11dwnuy~ • Al.•.u:~ka 99513 Attn1 Tim Ed\JardG l.h'?.>Jr Mr. [ d1..1ards April 26, 1991 A•. n:•t•wnted. plf;!.·,~t find 1 I sted br-lnw a sttu•n•u·y of discharge me,.suntmant.s '"H.I i'lnrnu'l peaks fot· (>u•· cr·e$t--~l:ng11 gage on Gold Crctek at ·rakotna {Nn. :tn30:JG61). B·-05··07 !;-17-::313 !;·-U -69 S··0t!··91 S-23-98 B Adnfctll ~ SnO\Jnlf 1 t J Ohcharge ( ft L1) 12 43 22 3G 2& Annual Pcuake !2.tt! 9-86-87 6-11-SIJ 6-tl-89 9-05-89 5-19-23-tt 8-26-91 :1 JUschargf ('ft /w) 42 46 .a 47 8 4& J 64 (Provieional) B 29 (Provl•1onal) lf you h~ve any questionca, plea11t1 ·fed free to oall me at 71S-71tt. SinCII'ely, ~~.~ Bruce a. Bigelow Fitld Office Chief AV - 4 IJN11'f:J) STA'l'£8 Station No: lSlO~ ltEt'ARTMf;NT OF THE I N'I'fl:l OR GEOLOGICAL SURVEY Water Resources Division Uescri ption Prepared: §.:J :-.fi.Z By: K,JJ ..... J#!.w.ca8kj. Revised: ~=~1:21 Cy: Jt,_Jio~t!i.uYb.t.Q.o fJ!scription of Ga';'ing St~t iNt '10 G2ld Ct.eek at Takotna. AK tPrepare des.:Tiptiou in acc.:u:d~ncf.' with outline on back or f'orl 9-7.77. Plot ~rOt;!! section tc• scale. US'e f·orm 9-213A or 9-213£ for cros.s section. U!e BeconrJ pa·~e r.,f thi::; fc.rm fc,r ~~:etch if room is available, otherwhe use FoliR 9-213C or 9-213fl. lnitinl ttnd date-all sheets.) ~U.Qn.--Lat 6ZC'59'20", long 156°04'08", in SE l/4 SE l/41 S~. 34, T. 34 N .. R. 36 W., on right b~mJ:, !JliO fl UF'~treall fro11 aoutb. From TaJ':otna Airport, dl'ive 10 mi downhill to bridge in Takotna. Uditaro\1 ll-1) f;_~t.~bJi$}\m~IJ.t .... ~ Cre:tt~st.a9e gage uas installed May 20, J987 by B. Bigelow anr.t J. McKechnie. l2to.inii~ .. ~a. --6. 31 sq mi. f:g.u..i.Pm.~u.t. --Standard 2-jn. by 4 ft. gal vanizt-d pipe with breakaway base lc•catP.d on ri·;Jht bank abi)Ut 10 fl below city trater intake. erest gage pin it~ 1.41 ft, gage datum. Elevation of gage is 400 ft above National Geodetic V~;-1 tical Uatum of 1929, fro• topographic: -~p. ~l.e.r..t:n<e,.JtiJSl .. .b..e.o . .;h.mf.!rK~. --R~l-1 t Baae' T(•P of head of PK nail set in down!ltr~&m, atre.:Jmt1ard he":!' of 12'' dia. cpru<:e tree, 0. S tt above ground, on l'eft b:mk. 25 ft drJwnsheam fro111, and in line with, sh•Jreward face of blue pump hc.use. Elev. 10.B94 ft, 9~9e datu• Rfl"2 Tc.'P of h~ad of PK nail ~et in dowustrea• face or 7" birch tree. 0.5 ft above ground, 10 ft shoreward fro• lert bank and directly o'='ross strea11 from CSG. EJev. 9.27 ft, gage datu• RM-3 top of 3/8" lag bolt set in downstrea11, strea•ward face of 12" dia. $pruce tree o. 5 feet above 9rrJund on left bank, 25 ft downstream frc,m and in line ~ith shoreward face of blue puep bous~. Elev. 11.35 ft, gage datua (flagged) I RH-4 top of 3/8" lag b(llt sP.t in downstream face of 7" birch ttef' 0.5 f'!et ab(,•Je 9round, lO ft shoreward froa left bank and directly acros:'l stre.~m fro111 CHG. Eltv. 9. 57 gage datum \flagged) AV - 5 .. • I .. kJlinnel.ond contr.21 ..... The channel bed conr,istJ of gnvel and cobble vlth steep vegetated banks (grass and willows). Ch~nnel meanders ao1evhat in the area of th('! g.,ge. Th~ :l trer..m be-nds to the left SO ft above gage, to the right directly below the gage and back to the left SO ft below the gage. Control is a gravel and cobble riffle 10 ft below gage at bend. and is probably subject tc.1 minor shiflin•i,J. lll.GhUSCJl~i.Yr~mtnt.l. --Measure01f.nts for a1 1 but extreme stagel can be made by wadinq in the vicinity of t.he ga91?. Extreme stages 111ay be measured from the bridge 500 ft downstream, or by indirect surveys. Floods.-- Point of zero flov.-- Winter flov.--Severe ice conditions during winter aonthl. Regulation and diversion.·~ None. Accuracy.--Open water record should be fair/good. Spring breakup peakl will be poor. Cooperation.--Station is operated and mai.ntained in cooperation witb the Alaska Department of Transportation and Public Facilities. AV -6 \ ' I ~ \ .. ~ --.......... -~·· ..,...-. ., .... ... It I !t i l f l .J f J I t I t ~ ~ *t ~~ 1 ~ .. I J ] 1 I tt ·t J h JJ 'b .it J - !If I~ o Jlltl ~ Q ) ..,, J • I I J• .,.. c! J It ll ' 'I . ~ .. ) .., ~~ !1 ..... I) ·~ J" ~1 If '&! 0'- .. " ... ,;. ~~ I .t . -- '~ I () ~~ i: . ' 1 1 1~ I ~1 Ill -.. _j ~ PB J • ~ ,.. ' -I \0 • ...... N t1 ~ 'I ~f~ }~ l'i lU ,n A~ ~ ,, j l I ~ ~ I • I 11 + ~ l J • ' \t. -~~ ~ ., .. '-1 .. "' ~ q u •• \ .. ~ ~ ~ "'~N• '~· ... N .... .. \ ... \) ~ . • . .:~ ·~ . '1 c!O ~ "' t lo 0 ' ~ ,.. I'C\ tl ' ~., \i ..., 1\') til ~ • " ... t:t ... ' ~ ' ~ ~ .. ~ ~ N ti .. ' ' ~ ~ ~ .. " ..,.. ~ ~ "' .. \) ~ ~ " " J -1 ~' 1 .•' ll )\l ~ it·. "·i 1J ~. 'I Q~ ~J I; ': ., • \Q •• ~ I ... "' '" ~ . .. "'> .. \o l I I ~ ·-,~ 4: .t. "' ~ ' ........ "' . ~ • .... N ... . ' '=· ~ ~- ' ·~ "' w ~ .. , ..s . .. , .... '~ 1.;; ..... .; ~ ;·3 ,., -r • :1! I \n .., AV - 8 - . "'z ~0 ov; ~~ _,Qt. ~~ o._ Viu -LIJ >--OrQ IIC :'.) . Q,.W'\ I ~ . • . J 1 • ( APPENDIX VI USGS OPHIR CREEK GAGING RECORDS AVI - 1 YUKON Al.\SKA "SS6Sl35 OPHIR CREEK NEAR TAKOTNA LOCATION.··Lat 63"08'42", lone lS6"H'lS",.tn SEltSWlt sec.H, T.27 S., R.l2 E., Hydrologic Unit 19030006, on fi(ht bank l5 !t (7.6 m) downstream from road crossine between airstrip and old town of Ophir, 500 ft (150m) upstream from mouth, and ZO mi (3Z km} northwest of Takotna. DRAINAGE AREA.·-6.19 mi 2 (16.03 ka 1 ). PERIOD OF RECORD.··Aueust 1975 to September 1980 (discontinued). GAGE.··Watar·staae recorder. Altitude of eaae is sao ft (177m), from topoaraphic map. REMARKS.··Records poor durinl period of no aaae·heiaht record prior to May 13, fair theTeafteT. AVERAGE DISCHARGE.··S years, 3.71 ft 1 /s (0,105 m1 /s), 8.1~ in/yr (207 m./yr), 2,690 acre·ft/yr (3.32 hm 1 /yr). EXTREMES FOR PERIOD OF RECORD.··Maxiaua discharae, about 360 ft 1 /s (10.2 m1 /s) May 18, 1977, 111e heiaht, •. 70ft (1.433 m), from ratins curve extended above 13 ft 1 /s (0.4 m3 /s) on basis of slope-conveyance study; no flow at tiaes durins most winter months. EXTREMES FOR CURRENT YEAR.··Maxiaua discharae, 57 ft 1 /s (1.63 a 3 /s) June 7, JaJe hei,ht, 2.67 ft (0.11• a) froa ratin1 curve extended as explained above; minimum daily, about O.S ft 1 /s (0.14 ml s) Jan. 17 to Apr. 11. DISCHARGE, IN CUSIC FEET PEA ~ECOHOo ~ATEA YEAR OCTOBER 1979 TO SEPTE148[A t9eo MEAN VALUES OAY 1 2 J • s 6 7 " 9 10 11 12 l3 lit lS 14 17 18 19 20 21 22 23 24 2S 26 27 28 Z9 30 31 TOUL 14E&N HU MIN CFSM IN. .e-FT OCT s.e s.s s.s s.s s.o ~o.s s.s 11 9,0 6.S s.s s.o •• s •.o •.o 2.9 2.7 2.6 2.5 2.4 Z.3 Zo3 Z.2 2.2 2.1 Z.1 U9,S 4.te 11 2.1 •• e • 78 257 NOV 2.1 2.1 2.1 z.1 2.1 2.3 Zo7 J.6 6.0 s.s •• o 3.2 2.8 2 •• 2.2 2.0 1.9 1.7 l.S 1.4 1.4 1.3 1.3 1.2 1.2 1.2 lol l•l 1.0 ••• 65.5 2.1t 6,0 1.0 ,JS .39 130 CAL YA 1•19 TOTAL 1J7e.JO WTA Yk 1910 TOTAL 1939,20 OEC t.o ,90 .90 .90 ,90 .eo .ao .eo .eo .ao .eo .70 .70 .70 .70 ,70 • 70 .70 .70 .70 .70 • 70 ,70 .70 .70 ,70 .70 .60 o60 .60 .60 23.00 .74 1.0 .60 .u ••• •• JAN .60 o60 .too .60 .60 .60 .60 .60 .60 .60 .60 ,60 .60 .60 .60 .60 .so .so .so .so .so .so .so .so .so .so • so .so .so .so .so 17.10 .ss ••• .so .09 .to lit .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so 14.50 .so .so .so .oa .09 Z9 MEAN 3.78 MAX 20 MEAN S,JO MAl lt2 .so .Sil .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so 1S.SO .so .so .so .oa ,09 31 !oliN oOO 141N .so APR .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .so .60 .60 .70 .ao 1.0 l.S z.s 7.0 11 lit 1S 16 79.70 Z.66 16 .so •• 3 ,48 1S8 CFS14 ,61 CfSI'I ,86 AVI 2 MAY 17 1e 18 18 17 16 1S 14 1• l3 6.5 6.1 s.e s.e S.6 S.6 s •• s.e 6.1 6.S 8.7 JJS.o to.e II S.4 t.7S z.o1 661t JUN l1 1Z 11 12 9.e 21 4Z 20 16 14 15 lit 12 11 10 9.8 9.3 e.1 a.• 19 17 12 11 9,8 12 14 u 16 1S 13 42J.e 14.1 42 8,1t 2.2e 2.SS eto1 JUl. 12 11 11 1Z 12 12 11 11 10 10 13 lit 12 11 11 ll 12 11 9,e 9,3 8.7 8.2 7.6 7,4 7.2 7.2 11 11 10 9.6 9,3 32S.J lO.S lit 7.2 1.70 }.95 61tS IN e.ze IN 1}.65 AC•'T Z730 lC-FT JeSO AUG 7.4 7,6 9,3 11 11 10 9,6 9.0 8.7 8.7 11 12 lit l3 u 12 11 10 9.6 9.0 8.7 8.2 7.9 7.6 7,6 7.6 293.1 9.45 lit 7.2 1.SJ 1. 76 S81 SEP a.• a.z 7.9 7.6 1.4 s.a 6.1 6.1 s.a s.a zu.z 7,Zit 8.1t s.a 1.17 1. 31 ltll · ~' YUKQ:,i .\L\SKA 155oS:3S OPHIR CREEK ~EAR TAKOTNA LOC.HION.-·Lat 63°08'~Z", long 156.31'15", in SE'>Sl~'l sec.!~, T.Z7 S., R.ll E., Hydrologic Unit 19030006, on right bJnk ZS ft (i.6 ~)downstream from road crossing between airstrip and old town of Ophir, 500ft (150 •l upstream from mouth, and 20 mi (3Z kml northwest of Takotna. DRAINAGE ARE.\.··6.19 mi 1 (16.03 km:). PERIOD OF RECORD.··August 1975 to current year. GAGE.··Water·stage recorder. Altitude of gage is 580ft (177m), from topographic map. REHARKS. ··Records poor. EXTRE~tES FOR PERIOD OF RECORD. ··Maximum discharge, about 360 fj 1 /s (10.2 m3 /t) May 18, 1977, gage height, 4.70 ft (1.~33 m), from rating curve extended above 10 ft 1 /s (0.3 m /s}, on basis of slope•conveyance study; no flow at times during most winter months. EXTREMES FOR CURRENT YEAR.··Maximum discharge recorded, Z3 ft 3 /s (0.65 •'Is) July 11, 111e height, Z.14 ft (0.652 m), from rating curve extended as explained above, but may have been lt•ater durina period of no JIJe• height record in Hay; no flow Jan. 11 to Apr. 20. OISCHARG£, 1'1 CUBIC F'EET PE!l! SECONI), WATEil! YEAR OCT08Eit 1978 fO S[IIIT!MIII!llt 1979 ,.f':AN VllUI"S 04'1' I 2 3 4 .. , 7 Ill ~ }f) II It' 13 14 IS I flo 17 18 lq "" 26 27 2l' ?.q 30 31 TOTAl M(lN NU MIN Cf5M .... AC·fT ocr J.o 3.n 3.o 2.5 2.5 1.0 ... , l.',O 2.0 ('.O 2.0 2.0 1.5 I.S 1.5 1.'5 l.'!i 1.'5 1.'5 I.S 1.o l.o 1.(1 J,(l 1 ,(1 t.o 57.0 1.84 3.o t.n .3o .34 113 NOV ,'10 .90 ,qo ,90 .eo .eo .eo .1'10 .70 .70 .70 .70 .60 .60 .60 .60 .so .sn .so .so .40 ,41) ,40 • 30 .30 17.80 .59 .90 • 30 .to .ll 35 CAl YR 1978 TOTll 97},411 vTR YR 1979 TOTaL 1240,90 DEC .30 .30 • 30 .30 .30 ,30 .3o .20 .20 .zo .20 .20 .20 .20 .20 ... o .20 .20 .20 .20 .• 10 .to .10 .10 oiO .10 .to .10 .u .10 .to 5.ao .19 .30 .10 .113 ,OJ 12 Jl1'4 .10 .to .10 .10 .10 .to dO .10 .10 .10 .~o .oo .oo .oo .oo .on .on .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo t.oo. • 0 J;! .ttl .oo .oos .01 2.0 "'!iN 2.66 "'EAN ),40 .oo ,on .oo .oo .oo .oo .on .oo .oo .oo ,on .oo .no .oo .on .oo .oo .no ,nl! ,on .oo .on .oo .on .oo .no .oo .on .oo .noo .oo .on .oon .oo .oo !OU 3,. MaJ. 20 NOTE.··No gage•heigbt record. Oct. 1 to May 31. .oo .on .oo .oo .oo .oo ,1)1) .on ,Oil .on .no ,(II) .nil .Oil ,no .on .oo .no .Oil .oo .no .nn .oo oliO .oo ,I! II .no .no .oo .oo .oo .oo .olin .oo .no .OliO .on .oo ' AP!l! .oo .oo .oo .oo .oo .oo .oo • oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .tO .20 .so ,10 1.o I. '5 1!.0 s.o 7,0 e.o i!'6.00 .87 s.o .oo ol4 ol6 '52 crs .. ,43 crs ... ss AVI 3 MAY 9,0 10 10 10 10 10 10 10 lO 10 s.o A.o e.o s.o e.o 11.0 11.0 s.o e.o s.o 7.! 7.5 7.5 7.5 7.'5 7.'5 2,4.0 8.61 10 7.'5 t.4o 1.62 '534 IN 5.&4 IN 7o46 II II 9,1 8.4 7.9 243.1 8o10 11 6.1 •• 31 1.46 48:! 7,1o 1.2 6. 7 . 6.9 7.9 20 18 14 l2 II 6.3 6.1 '5.8 '·" S.f!t '5.4 272.4 S,7ct 20 5,4 1.42 1.64 540 ac-n t9JO AC•'l 24'-0 AUG 5.2 5.0 4,1 4,6 4.6 5.8 5.11 6.1 6.'5 6.7 6.7 6.5 6.7 6.7 6.7 6.'5 1711.1 5,75 6.9 4.6 .~tJ 1.07 353 StP !>.1 Sol 5.6 '5.6 5.6 5.2 5.2 5.6 &.1 5.8 170.7 5.69 6.3 s.o .92 1.03 339 YU ~ON ALAS 1:A lSl 1556SZ3S OPHIR CREE[ NEAR TAKOTNA LOCATION.··Lat 63.08'42", lonr 1S6°3l'H", in SE~sw•, sec.l4, T.Z7 s., R.tz E., Hydrotoric Unit 19030006, on right bank 2S ft (7.6 111) downstream fro• N&4 crossins between airstrip and ol4 town of Ophir, SOO ft (150 •l upstrea111 fro111 111outh, and 20 1111 (3% km) northwest of Takotna. DRAINAGE AREA. ·-6.19 11i 1 (16.03 kll\1). PERIDD OF RECORD.··Ausust 1975 to current year. GAGE.··Water•state recorder. Altitude of 1ace is 580 ft (177 111), fro• topo1raphic •ap. REMARKS.··Reeords poor. Several observations of water temperature were made durin1 the year. EXTREMES FOR PERIOD OF RECORD.··Maximu• discharae, about 360 ft'ls (10.2 •'Is) May l&, 1977, l&le hei&ht, 4.70 ft (1.433 m), fro• ratint curve extended above 10 ft'/s (0.3 •'Is), on basis of slope-conveyance study; no flow at ti•es durint most vinter 111onths. EXTREMES FOR CURRENT YEAR.··Maximu• discharse, 54 !t 1 /s (1.53 111 1 /s} June 30, 1a1e heiaht, 2.30 ft {0.701 111), fro• ratinr curve extended above 10 ft 1 /s (0.3 a 1 /s); no flo~ Dec. 20 to Apr. 19. DAY 1 2 3 4 5 6 7 I 9 10 ll l2 JJ 14 15 16 If II 19 20 21 22 n 24 25 26 27 u 29 30 31 TOTAL HUN Hill Hilt CI"SM IN. AC•tT OCT 5.2 4,1 5.4 5.2 5.2 5.2 s.o ... !1 ... o J.S ),5 3.5 3.0 3.o J.o z.s z.s 2.0 z.o 1.1 ••• I .6 1.6 1 ... 1.4 1.2 lll.o 3.65 6,7 1.2 .59 .61 224 ·CAL YA 1977 TOTAL WTR YA 1971 TOTAL DISCHARGE, IN CUIIC I"EET PEA SECOND• WATER YEAR OCTOBER 1977 TO S[PT[HI[A 1971 !<!UN VALU£5 NOll 1.1 1 •• 1.0 .90 ,90 .eo • eo .70 .70 .70 .70 .60 .60 .60 .so .so ... o ... o ... o .30 .3o .30 o30 o30 ,30 ,zo ·20 .20 ·20 .zo l6ol!O .s .. 1.1 .zt .o. ... .31 11'.M,40 1011.11 O£C .20 .zo .zo .zo .20 .zo ,zo .zo .10 .to .10 ·10 .10 .to .to • 10 .to ,J 0 .10 .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo 2· 70 .oaT .zo .oo .o I .02 s ... .JAN .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo • oo .oo .oo .oo .oo .oo .-oo .ooo .oo .oo .ooo .oo .oo M[AN 4.81 MUM 2.10 1"£8 .oo .oo ,00 .oo .oo .oo .oo .eo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .ooo .oo .oo .ooo .oo .eo MAX l!75 HU 31 .oo .oo .oo .oo .oo • oo .oo .oo .oo .oo • oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .ooo .oo .oo .ooo .oo .oo MIN .00 MIN ,QO APR .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .oo .to .to • to .to ,JQ .to .to .to .ao .to .to .20 t.30 .043 .zo .oo • 007 .ot 2.6 CI"SM .11 CI"SM •"5 .zo .zo o20 o30 ,JO .30 .40 .so .60 ,90 1.1 3.0 4.S 6.0 to 1.0 6.5 s.5 4,6 4,2 ],4 z.e z,4 2.0 t.l lo6 lo!l 1.3 1.3 1.l lol 71.70 2oS4 10 .20 .... ,47 1!56 1.6 1.9 2.2 2.1 2.1 2.1 2.1 2.1 1,9 t.9 2.1 2.1 2.!5 S.l 22 9,6 7.2 7.0 7.5 6.1 .... 22 22 19 I !I 13 . 12 10 IS 31 262,1 1.16 31 ••• • ... z lo!SI !Szt JIA. II 16 ll 10 ••• 7.5 1.2 7.5 ToO 6,4 5.1 S.6 s.o 5.0 5.0 s.o 4,6 .... ... 6 4,6 ... 4 <>o4 4oZ 9.6 11 7,1 6,T !5.1 s.o 4,1 4,6 220.3 T.U II ... 2 loiS t.3Z 437 IN 10.55 IN 6.1!5 •e-rr 3410 AC•F'T 2030 NOTE.··No Ja1e·hei1ht re~ord O~t. 14 to May ll. AVI 4 AUG So !I Sol s.o 4,6 4,4 ..... 4o4 4,4 4o2 4.2 <>.z 4.6 4.6 .... ... 6 !SoO s.o s.o 5.6 9.4 11 ll 9,9 e.s 7.2 6.7 6ol 5.6 Sol s.o s.o 119.0 6.10 11 4o2 ·'' 1.14 31!5 S,3 !S.J s.o s.o S.3 s.o .... ... 6 6.1 6.7 6 ... ••• '5.6 s.o s.o 5,3 s.o ito I ... 6 ilo,4 lol 3.1 l.l J.o 3o0 lllol 4,63 •• 1 3.0 .7'!1 .u 275 211 YUKON ALASICA 15565235 OPHIR CREEl NEAR TAJCOTNA LOCAT!ON.··Lat u•oa'42", lonc 156.31'15", in Sl!'sSWII se.c.H, T.Z7 S., R.H e., Hydrololi<: Unit 19030006, on rtcht bank 25 ft (7.6 •l dovnstreaa froa road crossint between airstrip and old town of Ophir, soo ft (150 a) upstreaa fro• aouth, and ZO ai (32 t.l northwest of Takotna. DRAINAGE AR!A.••6.19 a12 (16.03 ka2), WATER·DISCHARGE RECORDS PERIOD OP RECORD.·•Ausust 1975 to <:urrent year. GAGE,··Water•stal• recorder. Altitude of 1•1• is sao ft (177 a), fro• topo1raphlc aap. REMARlCS.··Re<:ords poor except those between 2 and 5 ft 1 /s (0.06 and 0.14 •'Is), which are flir. EXTREMES FOR PERIOD OF RECORD.•·Maxiaua dischar1e, about l60'ff 11s (10.2 al/s) M1y 11, 1977, &Ill hel1ht, 4,70 ft (1.433 a), froa ratlnl .curve extendld abova 10 ft 1 /s {O.l • /s); on basis of. slop•·conveyanc• study; no flow at tiaes durinl aost winter aonths. EXTREMES FOR CURR!MT YEAR.••Maxiaua discharse, about 360 ft 1 /s (10.2 a'/s) May 11, 1111 helsht, 4.70 ft (1,433 a), fro• r1tln1 curve extend•d 1bov1 10 ft 1 /s (0.3 •'Is) on basil of slopl•conveyance study; co flow at tiaes durins winter aonths. DAY 1 2 , " s 6 T I 9 10 u lZ 1l 14 IS 16 17 11 19 20 21 22 2l 24 2!1 26 2f 21 29 30 ,. TOTAL MUN MAX MIN CUM IN• AC•rT OCT t.o ••• ••• t.o .90 .90 .to ... ••• oiO .TO .70 .?O .70 .TO .60 .u o60 •• o ... o60 o60 .so .so .so .so .so .so .so .so .so 2lo:JO o69 loO ·.so •ll . • u 42 OISCHARGit IN eullC r!!T 'IR S!CQNQ, ~Af!R V!AR OCTOICR ltTI TO JIPT!MIER 11Tf II(AN 'IALU!S NOV • 40 ·"'0 •• o ••• .ao •• o •• o ••• ••• •• o • n .:Jo .:Jo olO .n .n .:~o ,,. . ,. olO olO olO olO .n .30 ,,. olO .20 ·20 .zo '·" .32 o40 • to .os .06 111 Ot:C .20 .20 ,ii!O o20 .20 .20 .20 o20 .20 .21 .20 .20 .to ,zo ••• .10 .so ... .10 ••• ... .so .10 .to .to .to ... .10 ••• olO ... •• so ol!l .20 ••• .01 .u 1.9 JAN ... .u oiO .10 .10 .to ,,, .10 .ao .u ••• .to .10 .10 .10 .to .to .ao .to .ao ••• .u • u • 10 .ao .10 .os .os .os .os .os 2.1!1 .092 .to .os • o:r .o:r Sof .os .os • os • os .0!1 .os .os .os .os .os .oo ,oo .oo • 00" .oo .oo • oo ... .oo .to .oo ... .oo • oo .oo .oo • oo • oo .so .011 .os .oo .ou .oo loO ••• .oo .oo .oo .oo .oo ••• • oo .oo ••• .oo .oo .oo ... .oo • oo ... ••• .oo .oo ... .oo ... ... ••• • oo ... .oo .oo ... .oo ... .ooo .oo .oo .ooo .oo .oo .as .as .os .10 .to .10 .u ••• .to .to .20 ,zo .20 .20 .21 .20 .,. .:Jo ,40 ••• .so .To ••• 1.2 loS 1.1 2·:1 2.9 loS a,s u.zs ,71 .. , ,os .u ••• •• s.a T.o ••• 10 lJ If 16 u 9.6 .. ., .. , IS 2!1 il!4 10 ••• .. us Ill ,, 21 II 2T 20 21 .. n 20 IS Jl 11 9!1:1.6 30.1 us s.a •••• SoU .... ••• '·' '·' T,6 6,T Tol 1',6 1.2 6.9 6.3 6,7 11 •• o T.t 6,!J 6.1 S.l 6.1 T,6 9,6 .,,. 6of S.l s.z ••• ••• .. , ••• 3.7 loS 200.4 6.61 10 :J.S .... 1o20 391' ..u.. l,S ,., :J.S ••• •• 1 lo7 loS l.S :J,Z '·' 2.6 2.S t~• ••• 4,6 14 12 6.1 ••• ••• ,,, l.7 J,S :J.l 2.9 2.1 tn.2 4ol0 14 2.S .To .10 264 CAL YR 1976 TOT~ ll3o41 MEAN 2.21 MAl 2S MIN ,10 CrSN ,JO IN 4,19 AC•'T 1610 wfR YR l9Tf TOT~ 1661,00 MIAN 4oSS MAl t7S MIN .00 crSN o74 IN 9,9T AC_,T :1290 NOTE,··No c•a•·hetaht record Oct. 1 to Apr. 2l. AVI 5 Alii :J.S ,,, ,,, '·' '·' , .. z.• t.6 2.S ,,. 2.4 2.3 , .. lo!l 2.:J 2·2 2.S 2oS , .. 2·• 2·:1 2·2 2.0 2.0 J,9 1.9 1.9 lo9 lol ••• l• T 74.:1 2.•o J,S J,T ~Jt .. , .. , I• T 1.1' lo6 1.6 1.6 z.t ,,, 3,T 3.5 3al loS ••• s.z s.z 9,3 14 • •• 9,8 14 21 21 17 It 11 12 10 ••• '·' l.t 7,Z 2:16,4 T,ll n ••• 1.27 1,42 469 'I'UI:ON ALASKA %27 1SS65Z35 OPHIR CRE£1: NEAR TAI:OT~A··Continued DISCHARGt:t IN CUBIC rtt:t PER SECONDo WATER Y[AA OCTOBt:R 197S TO SEPT[M8U t•76 OlEAN Vli..UES on OCT NOY DEC JAN n:e "'U APR MAY JUH JUl. AUG Sf II> I s.o 1.5 .60 .20 .I 0 .to ,20 12 6.0 2.1 1.6 1.1 2 "'·' t.S .eo ,i!Q ·' 0 .tO .30 zo 6.0 2.2 lo6 I, I 3 4.6 loS .60 ·20 ol 0 ,JO .so 25 6.0 2.S loS ••• .. ... 2 loS .so .zo .l 0 • to ••• 22 7,0 l.T lo4 t.l 5 4,0 J,S • so .20 .10 .• t 0 ,70 .. '·' lo5 loZ J,6 6 ... o t.o .so .20 .to .!0 ,70 16 12 2.9 lol 1.6 T ... o loG .so .20 ,I 0 .to ,TO 14 IS 2.9 I • 3 loS • 4,0 J,Q .so .20 .I 0 .to • 70 13 14 ,,, I ,4 1.6 ' 4,0 J,Q ... o .zo .to .to .eo I) 11 2.1 lo .. 1.6 10 4,0 t.o • 40 .20 .10 .10 .eo ll 9,6 z.s ).3 1.9 11 4,0 t.o ... o .zo .10 .10 ••• ... T,o ,,, 1.3 Zol 12 4,0 ), 0 ,40 • zo • I 0 • 10 .To 1'5 '5.3 2.l t.z , .. tl 3.5 1.0 ... o .20 .to .to • 70 IS ... 6 2.1 lol 1.6 14 3.5 J,O olD .20 ,J 0 ,JO • 70 ll t.,o 2.2 lo4 1.6 IS 3.5 loO olO .20 .to .tO • 70 ll 3,7 z.z ),4 lo 9 16 3.5 1.0 olO .20 ,I 0 .u .. ,, 11 ... o 2ol lol I • ll 11 3.5 1.0 .30 .20 .10 olO ••• 10 4,4 ),9 lol lo6 Ill 3.0 o90 • 30 .zo .to .to .90 10 ••• 1.9 lo'5 1.5 19 l.O .90 .Jo .zo .to .10 t.o 9o0 6o4 1.9 '·" t.s 20 ),0 .90 ,JO .20 olO ·' 0 lot 9,0 S,6 ••• lo2 t.6 21 l.o o90 ,JO .zo .10 .to 1.2 ••• '5.0 l.6 I ,J 1.6 22 3.0 ,90 ,JO .zo .to oiO t. 4 ••• 4,4 t.s lol to6 u 3,0 ,90 .30 .20 .10 .to t.7 ••• "·' t.'5 1.4 1.3 24 2.'5 ,90 .:to .zo .t 0 .to 2.0 ••• 4,0 ),4 ··" t.l 25 z.s .eo ,30 .zo .to olO 2.'5 9,0 3,7 '·" 1.3 ••• 26 2.5 ,eo .]0 .20 .10 olO 3.0 9,1 3.3 l,4 a.s t.o 27 2.0 .eo .30 ,J 0 .10 .to ],'5 9.0 2.9 t.J t.l to II Zl z.o ••• .30 .to .10 .to s.o 9,0 2.6 t. 3 t.l t.o 29 2.0 .70 ,JO .to .t 0 .10 7.0 ••• 2.'5 1.6 • •• t.o 30 1.'5 ,70 ,30 .t 0 .10 9,0 T.o 2.3 z.t 2.1 t.o lt t.s .30 .t 0 .10 7,0 lo9 t.t TOTAl. 102.6 30.1>0 tl.70 5,10 2.90 3.10 50.60 :115, o 114,, 66.t 44,1> .. , .. M!AN 3.31 toOt .31 ,JI .10 ••• t,6t I Z,l 6.14 2.13 .... , t.n MU 5.0 1.5 ••• .zo .to ••• t.o 25 15 3.1 Zol z.t MIN t.s ,70 ,30 .to .to .10 .zo T,O 2.3 t.l t .t ••• Cf'SM .53 ·16 .06 oOJ .oz .oz .21 t.•s ,99 ,Jio .23 ,zs IN, o6Z .tl .oT ,OJ .oz .oz .:to z.zs t .tt ,40 .n .21 AC•f'T 204 60 2l ll s.e 6.1 100 n• 366 Ill .. 9t IITA TR 1976 TOTAl. 922.60 M[AN z.sz "'AX Z5 MI .. • t 0 Cf'SM o4l JN s.'54 AC•"T 1130 NOTE. • ·No ••••·heieht record Oct. s to June 9. WAT!R•QUALlTY RECORDS PERIOD OF RECORD.··Water year 1976. VU(R OU.I.tTT DAUt WAT(A T[AA OCTOIEA 1975 TO StPT(~· ltT6 SPE• erne INS UN• CON• COI.Oit T Ati!OIJS DUCT• Alii tii>I.AT• fUR• 81CAA• CARlON DIS• ANC[ PM T[MP[D• Tf:MP(R• tMVII-liD• IIQtj4f[ DJOUOI: TJIC CMAIIGI !MtCAO• UIJII[ ATUII[ COIAI.T ITT IHCOJ) !COli OAT[ !Cf'SI MHOS I lUll ITS I ID[G Cl IOU Cl UNITS I IJTUI 1140/LI 1..01\.1 JUN Jo ••• 0911 t.s 170 ?.6 15.0 ,.o •• 6 96 ,,. .M. 2•··· ZOO I z.z lOS ••• 9,5 tS J stP to z liT t.T Z! ••• 1100 \ t.t 350 .. , 2.5 \ \ AVI 6 ZZ6 YUKON ALASXA 15565235 OPHIR CREEl NEAR !AIOTHA LOCATION. ··Lat 63'08'42", lone 156"31'15", in SE'I:Slf!r sec:.l4, T.27 S,, R.l2 E., Hydro1ocic: Unit 19030006, on ri1ht bank ZS ft (7.6 m) down$tream from road crosslne between airstrip and old town of Ophir, 500 ft (150 a) upstre .. from mouth, and 20 ml (lZ l<a) northwest of Takotna. DRAINAGE AREA.··6.19 ai 1 (16.03 1<•2 ). lfATER·DISCHARGE RECORDS rERIOD OF kECORD.··AUIUSt 1975 to current year. GAGE.··lfater•state recorder. Altitude of aaae is 580 ft (177 a), froa topocraphic: ••P· REMARXS.··Records fair Aueust and Septeaber 1975. Records poor durinc 1976 water year except those for June 10 to Aug. Z2, vhieh are fair. EXTREMES FOR CURREN! PERIOD.··AIIIIIIt to Septeaber 1g1s: Marimu• discharce durinc Pfriod, 11 tt'ls (0.51 •'Is) Sept. 19, gage hei2ht, 1.75 ft (0,533 m), from ratint curve extended above 10ft /1 (0.3 • /1); aini•u•, 2.5 ft 1 /s (0.071 ml/s) Aua. 23, 24, raee hei;ht, l.Z7 ft (0.317 •l. Water year 1976: Maximum aaae height, 3.59 ft (1.094 •l probably in May, fro• hiah·water •ark, backwater fro• ice, discharae not deterained; mini•u• daily diseharae, about 0,1 ft 1 /J (0,005 •tis) Jan. 27 to Mar. 31. DAY AUG SEP 1 4.0 3. 5 2 4.0 3.5 3 4.5 3. 5 4 4.5 3.7 s 4.5 4.8 6 4.0 9.6 7 4.0 lS 8 4.0 11 DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST AND SEPTEMBER 1975 MEAN VALUES DA~ AUG SEP DA'l AUG SEP 9 3. 7 g,z 17 2.6 1.2 10 3. 5 10 18 2.1 14 11 3.3 11 19 2.!1 16 lZ 3.3 9. 9 20 Z.l u u 3.1 8. s 21 2.6 13 14 2.9 1. z 22 z. 6 11 15 2.9 6.7 23 2.5 9.6 16 2.9 6.1 24 2.1 1.2 AUGUST TOTAL 103.4 MEAN 3.34 MAX 4.5 MIN 2.5 CFSM .u IN. .62 AC·I'T 205 SEPTEMBER TOTAL ZS6.S MEAN 1.55 MAX 16 MIN 3.5 CFSM 1. 31 I H. 1.$4 AC·FT I AVI 7 DA'l AUG SEP 2S 5.1 7.5 Z6 3.5 6.7 27 3.3 6.1 Zl 3.1 7.0 n 2.!1 6., 30 J.l 5.6 31 3.5 SOli APPENDIXVll U.S. PUBLIC HEALm SERVICE LETTER \ AVII - 1 DEPARTMENT OF HEALTH & HUMAN SERVICES Public Health Service Refer to: A-OEH&E (DSF) Eagle River Engineering Services 11940 Business Blvd. Eagle River, Alaska 99577 ATTENTION: Mr. Lou Patera Dear Mr. Patera: Alaska Area Native Health Service Office of: Enviro11111ent.al llealt.h and En&ineerins 222 W. 8th Avenue, 165 Anchorar,e, Alaska 99513-7561 September 30, 1991 As per our meeting on September 27, 1991, I am sending you a copy of the T<tkotna survey which was performed on July 23-24, 1991. During this survey, after finding control poi~ts, we basically followed the trail that. runs near the stream bed. At periodic distances we would "take a shot" of the stream in order to find th~ elevation of the stream bed. The survey goes a!'proximat€Ly ?.,100 feet upstream from the existing water treatment pla~t (WIF). During this distance there was only approximately seventy-six <,76) feet of rise from the original stream bed elevation located at a point in front of the WTP. The WTP is located approximately 300 feet away from the stream on the side of a hill and is approximately 75 feet above the stream bed. The difference in elevation bet•tleen the WTP and the point which the survey stopped is one (1) foot. In order for this system to be a gravity flow system, we were hoping to get a minimum of 15 feet of elevation between the stream and the WTP in a much shorter distance. Assuming that the slope is cuntinttous, the total length of 12 inch penstock line necessary in order to obtain the desired results would be approximately 2,500 feet. Due to the cost of installing a 12 inch penstock line (approximately $134/foot installed) for the above mentioned distance, it has been deemed too expensive for the Public Heulth Service (PHS) to further pursue this type of system in order to satisfy our vlater intake concerns. At this point, the design of the \·later int;aka system has foll(Jlvcd an alternate path from the original gravity flot-1 desi.gn. If the Alaska Energy Authority (AEA) is able to subsidize the difference in cost from our project to a full hydro-generation project then we will again further purs·ue the gravity flew design. If the AEA is not able to subsidi?.e the 1ifference in cost, then the PHS has no choice but to continue to design an alternate watf:!r intake system. If you have any further questions or desire ~my additional information in order to complete your econo~nic feasibility study, please contact me at (907) 271-4700 extension 141. Sincerely, - / ~ ..4:::. ,.--.~. -~ T~mothy ~~dwards Design Engineer Enclosure cc: OEH&E, l\nc.hor.:tge -Robert iH lson;L.=n1renc<":! Lockyer/ Scott llath(~ws AVII -2 APPENDIXVIIT TAKOTNA POWER RECORDS - AVIII - 1 AfUC ELECTRIC UTILITY PCB FORJI UTILITY NAME IaJsotna CogJmmity laftOC!e UtlHtfea Information should be complete4 to ooinoi4e with ~epo~ting year. If the utility is on a Fiscal Y•ar, please usa th• hlankc to denote the correct ~ontb an4 year nat dvei9nated on thia form. CURRENT KWH KWH GALLONS PRIC8 OF HONTH YR. GENERA'l'EP I.QJd2. COHSYMBD fUlL/CAL JULY 1990 11024 10021 15)0 1.2&• AUG 1990 12528 12212 JllO ).26 - SEPT 1990 19275 14874 2050 1 2A U(;T 1990 157Sg 15195 20'Q 1.20 NOV 1990 24840 21286 2140 -'·20 DEC 1990 N/A 15732 2110 1 .;zo ' JAN 1991 18§70 16824 1710 1.20 FEB 1991 18056 15911 1760 l 20 MAR 1991 15179 1707] IMQ 1.2Q APR 1991 15570 13391 127" 1.20 MAY 1991 13589 12490 1§20 1,20 w JUNB 1991 13043 122Ql uno I 1.47 . TOTAL 177211 2Q480 AVIII - 2 , I . ~' 1 ' .. ., . c: ' APUC ELECTRIC UTILITY PCE FORM UTILITY NAMB '!'tkotna ConmynitX Asaogietioo Utllltig UTILIT1 ADDRESS e.o. Box 86 • Takotna, AK 99675 • TELEPHONE NUMBER •'~90~£w)~29~Bc-~22~1wl------------------------- MONTH JULY 1909 AUG 1989 SEPT 1989. OCT 1989 NOV 1989 DEC 1989 JAN 1990 FEB 1990 HARt:H 1990 A.t!K l.!:UIU HAY 1990 JUNE 1990 TOTAL KWII GENERATED 11313 15447 13009 N/A 19859· 15828 19Q48 223]9 17179 111J338 15924 9141 ... tool SOLD 0610 9970 12185 11969 17292 14295 16697 1207. 15433 12269 ] 2118 2810 l5553Z AVIII - 3 · . C::UN'tENT GALLONS PRICE OF CONSUMED FUEL/GAL ---- 1700 1.165 llgj l.lfi5 u:zo 1.34 1480 ·' .;y 1690 L34 127fl 1.J4 2)20 1 34 2050 1.]4 • 1620 1 ,. IA:Jlt , ,. 1870 1.34 15M 1.34 l9224 HECEIVEO APUC ELECTRIC UTILITY PCE FORM A.P.U.C. 1989 AUG 21 NO I: IS UTILITY NA.r.1E TakQtrll Community AISaociation .Oti1fties UTILITY ADDRESS ...~P~:..~•u..Or..e.1 ~8Q~X~S~.~oo~6:..-_ .......... _______ _ Takotna. AK 99675 TELEPHONE NUMBER ....~N:ue:.al..&.l....g.B'w.Jf...,.fio.llmwa"""p----------- CURRENT KWII J{WH GALLONS PRICE OF MONTH GENERATED SOLD CONSUMED FUEL/GAL JULY 1988 N/A 6461 1';100 1 • .20 AUG 1988 l-1/A 9279 1550 1. 20 SEPT 1988 I::ILA 116~~ 1300 1.20 1250 1. 20 OCT 1988 NLA-16~42 600 1.16.5 -NOV 1988 N{A ·15777 •1650 1.16.5 D!C 1988 J ~fila 18§12 .1~~0 1.16.5 JAn 1989 1::1/A 15687 2080 1.16.5 FEB 1989 1JlZ2 ~~fia~ 1560 1.16.~ MARCH 1989 l8Q53 J.72!J!i 1670 1.16.5 APRIL 1989 15176 9954 1450 1.16.5 MAY 1989 11921 1187~ ·1220 1.16.5 JUNE 1989 12074 g;·es 1040 1.16.5 t TOTAL 150367 18320 AVIII - 4 A.P.U.C. ELECTRIC UTILITY PCE FORM UTILITY NAME Tr1 k '' fna Cc,.nwu:11 ;1y As.socig t,"cn llr,·ut,-eJ CURRENT KWH KWH GALLONS PRIC'£ OF MONTH GENERATED SOLD CONStJm;D FU§LLGAL JULY 1987 ll£5:2.. 1 7 ;k.3. ll =t.~' ll·3{} AUG 1987 l0l3'1 ~f.!::/.Q lJ. 'J.Q L.uJ. SEPT 1987 C3l,: ~ q_ l Q Z1 S: l'-140 l . J:.fl OCT 1987 l =1. ~, ;l 3 l Q 'i. l:i l::. l:;/.00 L 7-Q NOV 1987 lSf'1o l~-I.J..·2S l !::/. ;£ ,., l' ]-Q DEC 1987 /\/ L .. A l Lf ~o~-l f. QQ. I::L/2 {J! LA . JAN 1988 l:t~a~ l ~.5-Q l· bQ FEB 1988 lv ld. 13b'i(r l ··-{'~' J. bQ I ,J .. MARCH 1988. AI /.A /.3 3 7.3 1 7.!2-o I. bD I APRIL 1988 ~/ £1t I Jot.ftl.e 13'-fO /. J-0 HAY 1988 AJ /4 11.3 & l'b7D I. bQ JUNE 1988 .!l' tA q L: i:Q lJ..3.c. J, J-{2 TOTAL AVIII - 5