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HomeMy WebLinkAboutScammon Bay Feasibility StudyAlaska Native Tribal Health Consortium Anchorage, AK Hillside Creek Project, Final Draft Report For Hydroelectric Feasibility Study, Scammon Bay, AK ANTHC 14-C-81313 Rev. 0 September 15, 2014 Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 1 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. Project Report September 15, 2014 Alaska Native Tribal Health Consortium Hydroelectric Feasibility Study, Scammon Bay, AK Distribution Gavin Dixon, ANTHC Larson Hunter, Scammon Bay, City Meera Kohler, AVEC Hillside Creek Project Table of Contents 1.Disclaimer and Limitations of Use ...................................................................................................... 3 2.Project Background ............................................................................................................................. 3 3.Scope of Project ................................................................................................................................... 3 4.Previous Studies................................................................................................................................... 4 4.1 Hillside Creek ................................................................................................................................ 4 4.2 Ekashluak Creek ........................................................................................................................... 4 5.Aquatic Environment ........................................................................................................................... 4 6.Climate ................................................................................................................................................... 5 7.Community Description ....................................................................................................................... 6 8.Consultation .......................................................................................................................................... 8 9.Diesel Electric Generation ................................................................................................................... 8 9.1 Existing Generation Equipment .................................................................................................... 8 9.2 Energy Generation ........................................................................................................................ 9 10.Geology ............................................................................................................................................... 10 11.Hydrology ............................................................................................................................................ 12 12.Preliminary Analysis .......................................................................................................................... 14 13.Proposed General Arrangement ....................................................................................................... 15 13.1 Access ........................................................................................................................................ 15 13.2 Diversion Structure and Intake ................................................................................................... 15 13.3 Water Conveyance ..................................................................................................................... 16 Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 2 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. 13.4 Powerhouse and Turbines .......................................................................................................... 16 13.5 Transmission and Interconnection .............................................................................................. 16 13.6 Controls and Operation ............................................................................................................... 16 13.7 Potable Water Supply Integration ............................................................................................... 16 14.Permitting ............................................................................................................................................ 17 15.Energy Modeling ................................................................................................................................. 17 16.Economics ........................................................................................................................................... 19 16.1 Diesel Fuel Cost .......................................................................................................................... 19 16.2 Economic Evaluation Method ..................................................................................................... 19 17.Cost Estimate ...................................................................................................................................... 21 18.Schedule .............................................................................................................................................. 22 19.Study Results ...................................................................................................................................... 22 20.Conclusion and Recommendations ................................................................................................. 23 21.References .......................................................................................................................................... 24 Appendix A - Field Reports A.1 Hatch Trip Report, 28 July 2014, 6 pages A.2 Aquatic Investigation Report by ABR, August 2014, 12 pages Appendix B - Economics B.1 Proposed Project Cost Estimate, 28 August 2014, 3 pages B.2 Economic Analysis Results, 28 August 2014, 1 page Appendix C - Concept Drawings C.1 H347306-G1, Project Map, 22-Aug-14, 1 page C.2 H347306-C1, Site Map, 22-Aug-14, 1 page C.3 H347306-C2, Diversion and Intake General Arrangement, 22-Aug-14, 1 page C.4 H347306-C3, Powerhouse Site Plan and General Arrangement, Access Road Section, 22-Aug-14, 1 page Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 3 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. 1. Disclaimer and Limitations of Use This report was prepared by Hatch Associates Consultants Inc. (“Hatch”), together with certain other third party consultants (the “Third Party Consultants”), for the sole and exclusive benefit of Alaska Native Tribal Health Consortium (the “Owner”) for the purpose of supporting the Owner in its efforts to determine the hydroelectric feasibility in Scammon Bay (the “Project”). This report is meant to be read as a whole, and sections should not be read or relied upon out of context. The report includes information provided by the Third Party Consultants and by certain other parties. Hatch has not verified such information and disclaims any responsibility or liability in connection with such information. This report contains the expression of the professional opinion of Hatch, based upon information available at the time of preparation . The quality of the information, conclusions and estimates contained herein is consistent with the reasonable standard of care governing our services and as set out in this report, as well as the circumstances and constraints under which this report was prepared. However, this report is a pre-feasibility study and, accordingly, all estimates and projections contained herein are based on limited and incomplete data, and Hatch therefore disclaims any liability arising in whole or in part from the review, use or reliance upon this report. While the work, results, estimates and projections herein may be considered to be generally indicative of the nature and quality of the Project, they are by nature preliminary only and are not definitive. As such, Hatch makes no warranty or representation, and disclaims the same to the Owner or any other party in respect of the report, particularly with regard to any investment decision made on the basis of the Report, and use of the Report by the Client and third parties shall be at their own and sole risk. 2. Project Background Currently, Scammon Bay generates electricity entirely through diesel fueled generators operated by the Alaska Village Electric Cooperative (AVEC). The high cost of diesel fuel in Scammon Bay and the challenges of operating in remote Alaska make electrical generation expensive. The current electrical rate in Scammon Bay is $0.651/kwh. The community is highly motivated to identify alternative forms of electrical generation in order to reduce rates, and reduce the community’s dependence on diesel fuel. 3. Scope of Project The general scope of work for this project is review of previous studies, perform aquatic investigations, prepare conceptual designs and cost estimates for viable hydroelectric alternatives, and update the economics for potential development. The project includes analysis and conceptual designs for the most beneficial and feasible hydroelectric project(s). 1 Residential customer rate as reported by AVEC in May 15, 2014 filing with RCA includes all costs for service. Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 4 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. 4. Previous Studies 4.1 Hillside Creek Previous investigations for a hydro project on the creek that runs through Scammon Bay were documented in reports from 1979 to 1985. A development scheme was initially recommended with a capacity of 100 kW. After further evaluation it was not recommended. Annual electrical demand was 426 MWh compared with present day demand of 1,700 MWh. The following are the most relevant studies: United States Army Corps of Engineers (USACE 1982), "Scammon Bay, Alaska: Small Hydropower Interim Feasibility Study and Environmental Assessment", March 1982. Average stream flow estimated to be 2.5 cfs. Recommended 100 kW project with a benefit to cost (B/C) ratio of 1.2. Wind power could complement the system. Alaska Power Authority, "Financial Analysis for Scammon Bay Hydroelectric Project", DOWL Engineers, September 1984. Approximate physical configuration: Intake elevation 600 feet Powerhouse elevation 112 feet Penstock diameter 12 inches Penstock length 3,500 feet Power 100 kW Annual energy 410 MWh Alaska Power Authority (APA 1985), Findings and Recommendations Scammon Bay, December 5, 1985. This study revised the hydrology estimates and concluded with no recommended alternatives to diesel generation. Demand was 426 MWh in 1984. B/C ratio decreased to 0.74. 4.2 Ekashluak Creek A development scheme for Ekashluak Creek was investigated by Polarconsult with the findings presented in a report in 2003. Alaska Village Electric Cooperative (AVEC 2003), Scammon Bay Feasibility Study, Final Report, March 7, 2003. Report prepared by Polarconsult for development scheme on Ekashluak Creek. Report did not find a feasible project at that location. B/C ratio determined to be 0.5 due to the long transmission line. 5. Aquatic Environment Investigations of fish presence and habitat were made on Towak Creek, Ekashluak Creek, Kawiakpak Creek, and the unnamed (Hillside) creek that runs through the community of Scammon Bay. The aquatic investigations were made by ABR and are detailed in their report included in Appendix A. The table below summarizes the fish species identified and approximate locations found. Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 5 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. Table 1 - Aquatic Investigation Summary Stream Body Fish Species Observed Approximate Upstream Limit of Presence (river feet) Approximate Elevation (ft) Towak Creek Pink Salmon 640 40 Ekashluak Creek Pink Salmon, Dolly Varden 2400 150 Kawiakpak Creek Slimy Sculpin Hillside Creek Dolly Varden 2670 70 The upstream extent of spawning salmon in Ekashluak is at an elevation of about 150' above sea level. For a project on this stream it is assumed that the powerhouse would be located at this elevation. Additional aquatic investigations would be required to verify whether this location is suitable to prevent impacts to spawning salmon. Dolly Varden in Hillside Creek extend up to an apparent fish barrier located at about an elevation of 70' above sea level. It may be possible to permit a powerhouse at a lower elevation by establishing environmental flows. Additional aquatic investigations would be required. 6. Climate The FAA maintains an automated weather/surface observing station (METAR) in Scammon Bay (station ID "PACM"). Raw hourly archive data was obtained (Iowa 2014) and is summarized below for monthly record count, precipitation, temperature, and wind speed. The data was not reviewed and therefore the quality is unknown. Table 2 - Record Count for METAR Station PACM Month Year 1 2 3 4 5 6 7 8 9 10 11 12 Total 2010 0 254 1,295 1,219 1,183 1,239 1,367 1,175 1,215 1,231 1,166 791 12,135 2011 1,449 1,549 1,082 1,640 1,176 1,112 1,517 1,593 1,190 2,256 3,344 1,172 19,080 2012 1,097 1,456 1,554 1,372 954 844 1,361 1,407 1,154 1,537 957 1,414 15,107 2013 1,392 933 1,419 1,305 1,224 1,321 1,373 1,314 1,352 1,326 1,146 1,090 15,195 2014 1,389 1,201 1,167 1,102 1,175 1,135 707 0 0 0 0 0 7,876 Table 3 - Precipitation Total (inches) for METAR Station PACM Month Year 1 2 3 4 5 6 7 8 9 10 11 12 Total 2010 #N/A 0.00 0.00 0.23 0.68 5.36 4.78 5.98 5.47 1.06 0.66 0.01 #N/A 2011 0.22 0.67 0.13 0.51 2.73 2.87 9.88 6.95 4.29 0.98 1.05 0.95 31.23 2012 0.00 0.06 0.00 0.00 0.75 0.62 7.74 10.96 3.75 7.10 0.50 0.64 32.12 2013 0.81 0.40 0.89 0.00 2.79 2.92 2.74 8.16 4.68 5.24 2.29 2.37 33.29 2014 3.12 0.31 0.02 0.48 1.04 1.50 7.41 #N/A #N/A #N/A #N/A #N/A #N/A Avg 1.04 0.29 0.21 0.24 1.60 2.65 6.51 8.01 4.55 3.59 1.13 0.99 32.21 Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 6 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. Table 4 - Average Temperature (deg F) for METAR Station PACM Month Year 1 2 3 4 5 6 7 8 9 10 11 12 2010 #N/A -1 0 20 32 43 51 52 49 33 27 17 2011 16 16 18 18 36 48 48 48 45 31 15 11 2012 -13 12 3 20 26 44 49 50 41 34 17 10 2013 20 1 12 14 30 45 51 54 45 39 26 20 2014 24 17 11 28 38 44 53 #N/A #N/A #N/A #N/A #N/A Avg 12 9 9 20 32 45 51 51 45 34 21 14 Table 5 - Average Wind Speed (mph) for METAR Station PACM Month Year 1 2 3 4 5 6 7 8 9 10 11 12 2010 #N/A 8 10 11 9 14 9 10 12 7 15 16 2011 17 20 16 16 12 14 13 13 7 8 12 12 2012 8 12 9 7 13 9 12 15 13 12 8 12 2013 14 7 11 8 12 11 10 9 9 12 9 0 2014 1 1 8 4 5 11 9 #N/A #N/A #N/A #N/A #N/A Avg 10 10 11 9 10 12 11 12 10 10 11 10 7. Community Description The following information was obtained from the Department of Commerce, Community, and Economic Development, the Division of Community and Regional Affairs, the Community Information for Scammon Bay (DCRA 2014). General Overview 2nd Class City in the Wade Hampton Census Area Current Population 518 (2013 DCCED Certified Estimate) Geography and Climate Location Scammon Bay is on the south bank of the Kun River, one mile from the Bering Sea. It lies to the north of the 2,300-foot Askinuk Mountains on the Yukon-Kuskokwim Delta. Climate The area's climate is maritime. Temperatures range between -25 and 79 °F. Annual precipitation averages 14 inches, with 65 inches of snowfall. Severe easterly winds during the fall and winter limit accessibility. The Bering Sea is ice-free from mid-June through October. Latitude 61.8428 Longitude -165.5817 History and Culture It was known in Eskimo as "Maraayaq," and its residents were called "Maraayarmiut." The nearby bay was named after Capt. Charles Scammon, who served as the marine chief of the Western Union Telegraph Expedition from 1856 to 67. The name came into use when the Scammon Bay Post Office was established in 1951. The city government was incorporated in 1967. Scammon Bay is a Yup'ik Eskimo community that relies on fishing and subsistence activities. Most residents travel 50 miles to the north to the Black River each summer for fish. Economy Commercial Fishing Permit Holders 37 Number of Commercial Fishing Permits Issued 43 Gallon of Heating Fuel $7.40 (July 2014) Gallon of Gasoline $7.40 (July 2014) Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 7 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. Transportation Transportation Scammon Bay is accessible by air and water. A state-owned gravel airstrip and city- owned seaplane base on the Kun River serve air traffic. Barges bring in bulk supplies each summer. Winter trails exist to Hooper Bay (32 mi) and Chevak (25 mi). Snow machines and skiffs are the primary means of local transportation. Housing Total Housing Units 105 Average Household Size 5 Bulk Fuel Facilities Number of Tanks for Heating Oil 1 Number of Tanks for Gasoline 1 Total Heating Oil Tank Capacity (gal) 60,000 Total Gasoline Tank Capacity (gal) 70,000 Fuel is Delivered Spring and Fall - June/July; August/September Fuel is Delivered Barge Water Distribution, Source and Treatment Systems Public Water System ID# AK2270184 Water System Details URL http://dec.alaska.gov:8080/DWW/JSP/WaterSystemDetail.jsp?tinwsys_is_number=303&tinwsys_st _code=AK&wsnumber=AK2270184 Electric Utility Alaska Village Electric Cooperative - AVEC Power Source Diesel generator PCE Eligible Yes Residential Rate $0.68 per kWh, June 2012 PCE reimbursement rate $0.45 per kWh, June 2012 Residential Rate after PCE $0.22 per kWh, Energy ISER Community Data Summary https://akenergygateway.alaska.edu/community-data- summary/1409133/ Schools District Name Lower Yukon School District Operated By REAA Grades Taught P thru 12 Number of Students 210 Number of Teachers 17 Photo 1 - Community of Scammon Bay Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 8 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. 8. Consultation Discussions with ADF&G resulted in a finding of no information available on aquatic species in the smaller streams including no catalogued anadromous waters other than the major rivers. No other resource agencies were consulted in the preparation of this report. Hatch also met with the Scammon Bay Community Council and presented a summary of the feasibility study scope and the results of the preliminary analysis performed to date which indicated that the local creek that runs through the community was the preferred source for hydroelectric development and that it appeared to be economically feasible. The concept of locating the proposed powerhouse to the lowest practical downstream elevation, a site situated on lot 5 of block 12 at an elevation of about 20 feet, was undesirable because of the expected lack flowing water in the creek when it is diverted and bypassed for the purpose of power generation by the hydro project. The lower portion of the creek is utilized for a variety of purposes by the community. 9. Diesel Electric Generation Data on existing diesel electric generation was obtained from the State of Alaska, Alaska Energy Authority Power Cost Equalization Program (AEA PCE) and directly from the electric utility operator AVEC. 9.1 Existing Generation Equipment The existing diesel power plant in Scammon Bay consists of 3 engines and is reported to have antiquated controls and switchgear. Planning for a replacement power plant is currently in progress. Because of the limited hydropower potential and lack of stream flow data, this project should not alter the current replacement diesel plant planning and implementation. AVEC is also analyzing the feasibility of wind generation. It is expected that a hydroelectric facility, with a stable and predictable power output, would supersede wind energy in meeting electric demand. This report includes an additional result parameter that shows the amount of demand that could potentially be met by a wind generator when combined with the hydro project. The table below shows the current diesel plant configuration (June 30, 2014 email from AVEC). Table 6 - Existing Diesel Power Plant Configuration Unit # Manufacturer kW Rating Model 1 Detroit 363 S60K4 1800 2 Cummins 350 K19G2 1200 3 Cummins 499 QSX15 G9 Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 9 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. 9.2 Energy Generation AEA PCE data consists of monthly total energy generated. This data is used to analyze load growth. Annual totals of the historical AEA PCE data is tabulated in the table below. Annual load growth has been about 6% for the past 10 years and about 0% for the last 5 years. Average diesel generation efficiency has been approximately 13.3 kWh/gal. Table 7 - Scammon Bay Electric Demand, PCE 2002 - 2012 Year Calendar Year Fuel Used, gal Generation Efficiency, kWh/gal 2002 1,032,754 80,165 12.9 2003 1,060,794 82,735 12.8 2004 1,186,052 90,076 13.2 2005 1,511,082 109,842 13.8 2006 1,602,974 118,034 13.6 2007 1,696,424 127,463 13.3 2008 1,735,500 132,662 13.1 2009 1,757,544 130,415 13.5 2010 1,697,567 128,377 13.2 2011 1,766,952 132,746 13.3 The detailed diesel electric generation data provided by AVEC consists of 15 minute interval energy totals for the calendar year 2013. This data is used for the modeling of the existing diesel generation combined with the hydroelectric generation. Some data was missing so other portions of the data set were synthesized by copying and scaling to establish a complete annual record for modeling. The 15 minute interval data is tabulated into monthly summaries in the table below. The graph that follows depicts the summarized daily data. Table 8 - Scammon Bay Electric Demand, Monthly Summary, AVEC 2013 Month Average Demand (kW) Peak Demand (kW) Energy (kWh) Jan-2013 218 462 162,494 Feb-2013 220 330 147,981 Mar-2013 206 471 152,998 Apr-2013 198 455 142,458 May-2013 180 416 134,258 Jun-2013 161 341 115,683 Jul-2013 157 264 116,885 Aug-2013 165 260 122,915 Sep-2013 182 278 131,218 Oct-2013 197 299 146,791 Nov-2013 217 316 156,412 Dec-2013 235 334 174,505 Annual 195 1,704,597 Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 10 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. Figure 1 - Chart of Scammon Bay Electric Demand, Daily Summary, AVEC 2013 The chart shows numerous peaks and outages occurring in Scammon Bay in the first half of 2013. The power plant operator reports that the underlying problems were remedied which is apparent as well. 10. Geology The Askinuk Mountains in the vicinity of Scammon Bay appear to consist of granitic rock. The decomposition at the surface is such that the granitic material can be classified as sand to sandy fine gravel interspersed with cobbles. Occasional larger structures of more competent granite such as the outcropping near the water tank are found in the project area. The sand surface drains well but is also very susceptible to erosion if any surface flow occurs on bare (unvegetated) slopes. The photo below shows the prominent exposed granite feature near the water tank and the active erosion occurring along the access road. 0 50 100 150 200 250 300 350 400 01/13 02/13 03/13 04/13 05/13 06/13 07/13 08/13 09/13 10/13 11/13 12/13 01/14Power(kW)Date Min/MaxDemand(kW)EstimatedMin/MaxDemand(kW) AverageDemand(kW)EstimatedAverageDemand(kW) Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 11 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. Photo 2 - Surface Geology - Road and Prominent Outcropping Near Water Tank Concerns identified in the USACE reports and the Scammon Bay Hazard Mitigation (CSB 2013) report relate to soil erosion caused by melting permafrost. A relatively warm pipeline could increase the depth of the thawed layer in underlying permafrost creating a potential erosion trench/gully. However, no areas of erosion, linked to melting permafrost, were evident in the aerial photo and the vicinity of the water tank. Disturbance of permafrost, if it is present, can be avoided by routing the pipeline in shallow or partially excavated trench in the presumably permafrost free creek valley where snow drifting occurs. Locally obtained bedding can provide for protective cover. More problematic is erosion associated with exposed soils on moderate to steep slopes. Active erosion of exposed decomposed granite caused by rainfall is clearly evident along roads, ditches, and cut and fill slopes. Successful mitigation efforts employed locally include using revegetation, geotextiles, woven fabrics, or surface overlays consisting of coarse gravel, cobbles, or boulders depending on slope being retained and expected runoff. Aside from erosion potential, the soils in the project vicinity are suitable for the development with locally available sand quality bedding, small boulders and cobbles obtainable by screening and suitable for drainage stabilization, and potential for relatively shallow confining Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 12 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. and stronger bedrock for the intake and powerhouse although boring or excavation at each site is required to verify. 11. Hydrology The sandy characteristic of the decomposed granite likely allows infiltration most snow melt and rainfall. The result is that local creeks should exhibit stable and relatively high base flows and low runoff peaks. Such characteristics are favourable for the proposed run of river hydro development. Snow drifting, which is evident in winter pictures of Scammon Bay, may be a contributing factor to stream flow as well by providing additional water accumulation and reducing heat loss in the winter. Aerial photos show the creek valley remains snow filled well into the summer season. Search of USGS water resources data website2 for historical stations and individual flow measurements did not produce any results for the creeks of interest in Scammon Bay. Nearby sites that were reviewed include Brown's Creek near Bethel and Takikchak River near Newtok both of which had significantly less discharge per square mile than the values reported by the USACE and Polarconsult for the Scammon Bay area. The hydrology values reported by the USACE in 1985 appear reasonable given the soil and snow conditions. The flow measurement in July, documented in the Hatch Trip Report in Appendix A, were taken after a unusually long dry period followed by a short but wet period3. The flow measurements appear to confirm a respectable base flow and well draining soils with a large storage capacity. This type of condition is well suited to run of river hydro projects which lack storage. The figure below compares the monthly hydrology data from the available data sources above. 2 http://nwis.waterdata.usgs.gov/ak/nwis/sw 3 Scammon Bay resident recollection Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 13 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. Figure 2 - Chart of Scammon Bay Hydrology Data, Unit Stream Flow (cfs/sq mi) The values used for this work are the unnamed Scammon (Hillside) Creek flows scaled by the basin area for each location of interest. For the Hillside Creek intake site, the following table shows the estimated average hydrology data used for analysis which is the same as the final revised USACE flow estimate published by the Alaska Power Authority (APA 1985). Table 9 - Monthly Hydrology Data for Modeling Month Model Data (cfs/sq mi) Hillside Creek Intake, cfs (1985 USACE revised numbers) Jan 0.8 0.6 Feb 1.5 1.1 Mar 2.7 2.0 Apr 3.4 2.5 May 6.9 5.0 Jun 8.2 6.0 Jul 5.5 4.0 Aug 2.7 2.0 Sep 4.1 3.0 Oct 4.1 3.0 Nov 2.7 2.0 Dec 1.4 1.0 0 2 4 6 8 10 12 1357911UnitFlow,cfs/sqmiMonth EkashluakCreek UnamedScammon(Hillside)Creek BrownsCreek TakikchakRiver Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 14 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. 12. Preliminary Analysis Alternatives to diesel generation for Scammon Bay, consistent with findings in past reports, consist of hydroelectric and wind energy generation. This report includes analysis of hydroelectric potential. The Ekashluak project, as originally proposed (AVEC 2003), with a powerhouse located at elevation 20', is not considered feasible because of the salmon habitat. For the preliminary analysis, the powerhouse has been located upstream from the mouth to an elevation of 150' feet. For Hillside Creek, it may be possible to permit a powerhouse at a lower elevation by establishing environmental flows but the resulting benefits are not expected to be worth the costs. When combined with community concerns related to local use of Hillside Creek, the lower powerhouse option on Hillside Creek (Hillside - Alt 1) is not recommended but it is included in the preliminary analysis for reference. The table below shows the results of the preliminary analysis. The results are sufficiently conclusive to establish Hillside Creek as the only viable hydro project at this time. The remainder of this report is entirely concerned with Hillside (Proposed) Project. Table 10 - Preliminary Analysis of Regional Hydroelectric Resource Potential Project Hillside (Proposed) Ekashluak Kawiakpak West Ekashluak + Kawiakpak Hillside - Alt 1 Intake Watershed Area (sq mi) 0.73 3.34 2.23 3.07 5.57 0.73 Hydraulic Capacity (cfs) 6.0 28.0 17.0 25.4 N/A 6.0 Intake Elevation (ft) 570 400 450 150 N/A 570 Powerhouse Elevation (ft) 70 150 20 20 N/A 20 Capacity (kW) 190 390 430 170 820 210 Estimated Annual Energy Potential, MWh 740 1,500 1,820 660 3,320 820 Capacity Factor 44% 44% 48% 44% 46% 45% Annual Energy Displaced, MWh 720 1,160 1,280 660 1,490 780 Annual Fuel Displaced (gal) 54,000 87,000 96,000 49,000 112,000 59,000 Annual Benefit ($ thousands) $220 $355 $392 $202 $457 $239 Approximated Cost ($ thousands) $3,100 $17,800 $17,000 $7,200 $21,400 $3,100 Approximated B/C Ratio 1.4 0.4 0.5 0.6 0.4 1.5 Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 15 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. 13. Proposed General Arrangement The proposed conceptual design for the Hillside Creek project has been prepared to facilitate the project modeling and analysis and is described below. The concept design is more accurately depicted in the conceptual drawings and detailed cost estimate in the Appendices. The following table summarizes the basic parameters for the proposed project. Table 11 - Summary of Proposed Project Configuration and Analysis Results Description Value Units Intake Elevation 550 ft Intake Watershed Area 0.73 sq mi Powerhouse Elevation 70 ft Static Head 480 ft Hydraulic Capacity 6.0 cfs Pipeline Length 4300 ft Pipeline Diameter 16 in Dynamic Head 454 ft Transmission Length 0 mi Road Length 4300 ft Min Operational Flow 0.45 cfs Turbine Efficiency 90% Generator Efficiency 94% Transformer Efficiency 97% Net Efficiency 82% Nominal Capacity 188 kW Annual Energy Potential 755,790 kWh Displaced Diesel Energy 646,537 kWh 13.1 Access The concern with the access road is the relatively steep gradient and erosion potential of the soils. As such a geoblock type underlayment is proposed to confine sand like native material and prevent erosion that could compromise the pipeline buried below the surface of the access road. The access road is primarily needed for construction. Once the project is operational access needs are minimal as the intake is designed to be self cleaning. 13.2 Diversion Structure and Intake The primary function of the diversion structure is to impound water for diversion through the intake works. The diversion is a water tight barrier that extends from the flood water elevation down to bedrock across the creek channel. Local materials can be used in the concrete fill that forms the foundation of the structure. The remaining walls would be formed and poured on site except for the spillway which could consist of precast block sections that also incorporate the coanda intake. The intake works consists of a coanda intake, shut off and bypass gates, a domestic water supply priority weir, trash rack, and transition structure. The purpose of the these components is to capture all water available at the intake site, exclude debris from capture and allow debris to be flushed, prioritize captured water into the domestic water conveyance, and finally Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 16 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. divert all remaining water into the penstock conveyance without allowing air to enter, ice to buildup, or accidental debris entry into the conveyance. Once or twice a year flushing of sediment, visual inspection, and maintenance of gates may be all that is required for access and maintenance of the diversion structure and intake works. 13.3 Water Conveyance The function of the penstock is to efficiently convey collected water to the powerhouse and turbine for producing electrical energy. The required size of the penstock is based on the economic modeling. If the diameter is too small then there is excessive energy lost in friction which reduces the energy the turbine is able to convert from the flow of pressurized water. Too large of a penstock and the project cost needlessly rises. The analysis performed for this report was limited to looking at single diameter HDPE pipe for the penstock. Analysis shows a 16" diameter penstock is the most economical but a 14" diameter is suitable as well. A combination of sizes along with steel pipe should be considered if the project goes to design. The 16" diameter is chosen for this work. 13.4 Powerhouse and Turbines The turbine and generator package consists of a custom dual nozzle pelton turbine, induction generator, switchgear and controls panels, hydraulic power unit, turbine inlet valve and structural steel equipment mounting frames. The overall turbine and equipment layout is estimated from similar sized projects. Powerhouse construction consists of a concrete foundation and steel building. The location chosen for the powerhouse site is on land owned by the Askinuk Native Corporation. The site is very constrained and access options are limited but it appears that the proposed site plan will be suitable. 13.5 Transmission and Interconnection This project is located within the community with a power pole and distribution line located on the same property as the powerhouse. The cost estimate assumes a transformer is required. 13.6 Controls and Operation The hydro project is expected to operate at maximum output, limited by the water availability at the intake and the maximum capacity, at all times. The hydro operation power would be curtailed when required by the use of an electronic load governor. Standard trips would be incorporated in the switchgear for protection. The concept includes an induction generator because it is assumed that a diesel generator is operating continuously. 13.7 Potable Water Supply Integration The proposed project integrates well with the community's water supply and potable system. Improvements in water system functioning include: Higher water pressure eliminates need for booster pump and improves the filter and backwash systems. Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 17 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. An improved diversion structure and the coanda screen intake will reduce maintenance and improve water supply reliability. The risk of water supply contamination is reduced by having the intake located further from the community. The tailrace water could be utilized as a low pressure raw water supply source. 14. Permitting Permitting will be led by the Alaska Department of Natural Resources (ADNR) water rights application requirements for demonstrating rights to access by the development entity and establishing water use quantities. The project is expected to be non jurisdictional with respect to Federal Energy Regulatory Commission (FERC) licensing. The diversion structure would likely be exempt from ADNR dam safety. The Alaska Department of Fish and Game (ADF&G) provides oversight for protection of aquatic species to ADNR water rights and is also responsible for review of in stream structures and activities. 15. Energy Modeling Energy modeling is done using a daily time step model based on the daily average and peak demand and the monthly discharge in Hillside Creek. Heat demand is not considered in this analysis. The performance and economics of the hydroelectric project are analyzed on the basis of the diesel generation costs that can be avoided if the hydro is constructed. Avoided costs include the reduced fuel consumption and, to a certain extent, non fuel costs. Avoided fuel costs are determined using the price of fuel and the potential displaced diesel electric generation in kilowatt hours (kWh). The displaced fuel is determined from the diesel efficiency and fuel use for the base case of diesel only generation less the diesel efficiency and fuel use for the necessary diesel generation with the allowable hydro generation. Allowable hydro generation is constrained by the minimum diesel loading and the amount of excess power available from the hydro. Modeling assumes a minimum diesel loading of 20% of the rated capacity. If the power from the hydro is 10 kW or higher above daily peak demand then it is assumed that a diesel is not needed. Else, if the hydro power exceeds the daily average demand then a diesel is assumed to run at the minimum loading for 12 hours and the energy displaced by the hydro is curtailed as required for the same period. Finally, if the hydro power is less than the average demand then the hydro output is curtailed for 24 hours as required to maintain the minimum diesel loading. Diesel generation efficiency is based on an assumed efficiency profile based on percent load and is scaled to match an expected future average efficiency 14.0 kWh/gal. The efficiency curve, along with the minimum diesel loading, is also based on a typical manufacturer's rating for a single 350 kW engine. Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 18 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. Avoided non fuel costs are included in the energy model but are found practically inconsequential because there is essentially no entire day where the demand is low enough for the hydro to carry the entire load. For this reason a diesel generator is required to run nearly all year. Since the maintenance on the diesel power plant is almost exclusively determined by the number of hours the unit runs and is practically independent of load there is very little savings attributable to non fuel costs as a result of hydro operation. The modeling uses $15 per hour for non fuel diesel operation costs. The energy that could be potentially met by a wind generator when combined with the hydro project is calculated using the same assumptions and constraints as above. The displaceable diesel generated electric energy for wind generation, in the chart below, is the modeled electrical demand less the total of the curtailed hydro output plus the minimum diesel generator loading. The following chart shows the daily electrical generation with the proposed project combined with diesel electric generation. The wind electric power is the potential electric demand that could be displaced by wind energy without consideration for storage technologies and resource limitations. Figure 3 - Chart of Proposed Project Daily Operational Model Chart, 2013 Demand 0 50 100 150 200 250 300 350 400 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecPower,kWDate(2013) DieselElectricPower HydroElectricPower AverageDemand(kW) MaxDemand(kW) HydroPotential,kW WindElectricPower Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 19 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. 16. Economics Evaluation of the proposed project is made by comparing the net present cost and benefits with the base case of diesel electric generation. A planning horizon of 50 years and a discount rate of 3% is used for the analysis. Uniform inflation is assumed for all costs except for diesel fuel costs which are expected to escalate at a rate of 1.5% greater than inflation. All results are reported in 2014 dollars (inflation excluded). Electric demand is expected to grow at a rate of 2% annually. 16.1 Diesel Fuel Cost The price of diesel fuel for electric generation averaged $3.59 per gallon for FY 2013 (7/1/2012 through 6/30/2013). Inquires with AVEC and a review of filings with the RCA did not result in any updated fuel pricing information. It is estimated that the most current price for delivered fuel in Scammon Bay is about $4 per gallon. The economic modeling for this study uses the current fuel price estimate of $4.00 per gallon escalated by a rate of 1.5% per year (above inflation). 16.2 Economic Evaluation Method The parameters reported in the results table are generation related components of the total annual costs calculated over the planning horizon and adjusted for year of occurrence using the discount rate. Conclusions are shown in two ways: the net present cost of generation and the benefit/cost ratio. The two methods present two different viewpoints on project benefits. 1. The Net Present Cost of Generation (NPC) presents the results from the viewpoint of a consumer to illustrate which of the projects, including the no hydro alternative of diesel only, provides the lowest cost of power. 2. The Benefit/Cost Ratio (B/C) presents the results from the viewpoint of an investor and illustrates whether the benefits of the proposed development are greater than the cost (i.e., B/C >1). The following describes additional detail on the economic parameters. Net Present Cost of Generation - Diesel Electric. The net present cost of electric generation using diesel is the sum of the diesel fuel costs, inflated as indicated, and the generation related O&M costs over the planning horizon. Costs are discounted based on the year of occurrence. This is the base case from which the benefits of the hydro option are determined. Costs not associated with generation, such as distribution system maintenance and administrative services, are not included. Net Present Cost of Generation - Hydroelectric. The net present cost of electric generation with the addition of the hydro. Where the hydro is unable to meet demand the necessary diesel generation expense and associated diesel O&M expense is included in the annual cost. This includes the cost of generating power from the present year on which is entirely diesel only generation until the hydro is commissioned. The cost to construct the hydro and Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 20 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. the O&M cost of the hydro are also included. When the NPC of hydro generation is less than diesel electric generation the proposed project is superior. Present Value of Hydro Development Cost. Used for B/C calculation, the present value of the of the hydro development cost is the cost component in the B/C Ratio. This is the sum of the costs, over the planning horizon, to develop the hydro discounted by the year the costs occur. Only costs to develop and construct the project are included. Present Value of Hydro Benefits. Used for B/C calculation, the present value of the annual cost savings from the hydro is the benefits component in the B/C Ratio. This is the sum of the benefits, over the planning horizon, to develop the hydro discounted by the year the benefits occur. The benefits of the project are defined as the cost of generation using diesel only minus the cost of hydro generation for each year. The cost of hydro generation includes the fixed O&M cost of the hydro, the cost of diesel fuel from required diesel generation needed to meet demand, and the associated diesel O&M cost. Costs to generate power from present day through hydro development are included (benefits are zero until project is commissioned). B/C Ratio. This is the present value of the hydro benefits divided by the present value of the hydro development cost. When greater than 1.0 the proposed project is superior. Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 21 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. 17. Cost Estimate The table below is a summary of the opinion of probable costs for the development and construction of the proposed project. A detailed construction cost estimate is attached with this report. Table 12 - Opinion of Probable Costs Summary Description Labor Hours Labor Cost Equipment Cost Material Cost Mobilization Cost Total Cost Construction Support 1,242 $158,200 $92,877 $251,077 Mobilization $346,880 $346,880 Access Trail 734 $71,183 $119,926 $191,110 Powerhouse 498 $50,380 $69,363 $119,743 Dam and Intake 1,637 $169,121 $100,566 $269,687 Pipeline 1,218 $120,278 $295,318 $415,596 Turbine and Generator 300 $33,300 $450,000 $483,300 Tailrace 72 $6,760 $8,500 $15,260 Transmission 101 $10,007 $6,900 $16,907 Equipment $259,890 $200,000 $459,890 SUBTOTAL, Contractor Direct Costs 5,801 $619,229 $259,890 $1,050,573 $639,757 $2,569,448 SUBTOTAL, Construction Contract $3,608,056 Development Costs $650,000 TOTAL PROJECT $4,258,056 Table 13 - Opinion of Probable Costs by Category Category Cost Direct Labor $619,229 Travel & per Diem $92,877 Equipment $259,890 Materials & Supplies $1,050,573 Shipping $546,880 Indirect $1,038,608 Development Costs $650,000 Total $4,258,056 The cost estimate presumes that the work force will consist of an average of 6 crew members and a supervisor. Three of the crew are expected to be local hire which reduces the housing, meals, and travel costs. Additional labor costs include chartered round trip air service from Anchorage occurring every 2 weeks during construction. The costs for construction equipment and material mobilization to and from Scammon Bay is based on a marine shipping quote from Northland for delivery from Seattle to Scammon Bay. Northland operates a landing craft type vessel capable of delivering construction equipment, up to 50k pounds, 20' long stackable shipping containers up to 20k pounds, and 40' long pipe bundles. Pipeline costs are based on weight with the entire penstock constructed from PE4710 pipe with electro-fusion fittings and thicknesses ranging from SDR 26 to SDR 9. The cost of delivered pipe is based on the total weight and the number of shipping bundles required. Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 22 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. Turbine costs were quoted by Canyon Industries, an American manufacturer. The quote included a complete package consisting of the turbine, generator, controls, and switchgear. Contractor installation is assumed along with additional costs for control integration. 18. Schedule The schedule is based on an assumption that development begins following successful funding through the State of Alaska REF grant program starting with an application for design and permitting in 2014 followed with REF construction funding being awarded in 2017. The basic development schedule is summarized below. Table 14 - Proposed Development Schedule Description Start Finish Permitting and Design Jul-2015 June-2017 Construction Jul-2017 Oct-2017 19. Study Results The results of the analysis shows that the proposed project in combination with diesel generation is superior than diesel generation alone. The following table describes the economic results. Table 15 - Results of Project Modeling and Economic Analysis City of Scammon Bay Annual Electric Demand (2013) 1,704,597 kWh Modeled Annual Fuel Use (2013) 121,897 gals Modeled Annual Fuel Costs, 2014$ $487,586 Hillside Creek Modeled Annual Energy Potential 755,790 kWh Hillside Creek Modeled Annual Displaced Diesel Electric Generation (2013) 646,537 kWh Hillside Creek Modeled Annual Displaced Diesel Fuel (2013) 39,252 gal Hillside Creek Modeled Annual Market Value of Displaced Diesel Electric Fuel (2014$) $157,007 Hillside Creek Modeled Total Construction Cost (2014$) $4,258,056 Diesel Only Hydro + Diesel NPC of Generation $28,810,083 $27,509,600 NPV of Investment, Costs $0 $3,796,282 NPV of Investment, Benefits $0 $5,096,765 B/C Ratio of Investment NA 1.34 Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 23 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. 20. Conclusion and Recommendations Conclusions The Hillside Creek hydroelectric project is a viable addition to electric generation in Scammon Bay that should be investigated further through design and permitting efforts. Future work should include a focus on stream flow data collection, conceptual design improvement, community and other stakeholder consultation, initial permitting actions, land acquisition, potable water system integration, and compatibility and economics with wind generation and diesel heat recovery projects. Project design would follow if it is decided to construct the project. Recommendations The hydrology data is not adequate to recommend a project size for final design and permitting. Collection of stream flow data on Hillside Creek will be required if the project proceeds to design and permitting. It is recommended to install a stream gauge and collect 2 to 3 years of flow data for project design and permitting. Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project Final Draft September 15, 2014 Rev. 0 Page 24 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. 21. References Alaska Energy Authority (AEA PCE), Power Cost Equalization Program, http://www.akenergyauthority.org/programspce.html. Alaska Power Authority (APA 1985), Findings and Recommendations Scammon Bay, December 5, 1985. Alaska Power Authority, "Financial Analysis for Scammon Bay Hydroelectric Project", DOWL Engineers, September 1984. Alaska Village Electric Cooperative (AVEC 2003), Scammon Bay Feasibility Study, Final Report, March 7, 2003. Alaska Village Electric Cooperative (AVEC 2014), PCE Annual Report, May 13, 2014, and PCE Annual Report Supplement, May 15, 2014, Regulatory Commission of Alaska. City of Scammon Bay (CSB 2013), Hazard Mitigation Plan, Draft October 2013, http://commerce.alaska.gov/DNN/Portals/4/Repository/Plans/ScammonBay%20LHMP%2020 13.pdf Department of Commerce, Community, and Economic Development, the Division of Community and Regional Affairs (DCRA 2014), the Community Information for Scammon Bay, August 1, 2014, http://commerce.alaska.gov/cra/DCRAExternal/community/Details/aeb89185-de2a-40f7- ad74-2e0ef5b0628b. Iowa State University of Science and Technology (Iowa 2014), IEM :: Download ASOS/AWOS/METAR Data, August 1, 2014, http://mesonet.agron.iastate.edu/cgi- bin/request/getData.py?ls_baseLayers=Google+Streets&AK_ASOS+Network=AK_ASOS+Ne twork&station=PACM&data=tmpf&data=sped&data=p01i&year1=2010&month1=1&day1=1&y ear2=2014&month2=8&day2=1&tz=GMT&format=tdf&latlon=no&direct=no United States Army Corps of Engineers (USACE 1982), "Scammon Bay, Alaska: Small Hydropower Interim Feasibility Study and Environmental Assessment", March 1982. Daniel Hertrich Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project , Rev. 0 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. Appendix A - Field Reports A.1 Hatch Trip Report, 28 July 2014, 6 pages A.2 Aquatic Investigation Report by ABR, August 2014, 12 pages If you disagree with any information contained herein, please advise immediately H347306-trip report, Rev. 0 Page 1 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. H347306 Trip Report 28 July 2014 Alaska Native Tribal Health Consortium Scammon Bay Hydroelectric Feasibility Study Distribution Those present + Larson Hunter, Scammon Bay Gavin Dixon, ANTHC Summary of Field Work Date: 21-23 July 2014 Location: Askinuk Mountains Scammon Bay, Alaska Present: Daniel Hertrich, Hatch John Seigle, ABR Purpose: Investigate local conditions and aquatic presence in streams 1. Introduction The purpose of the site to Scammon Bay was to investigate local conditions and evaluate the presence, or lack of, of fish in the streams near Scammon Bay to better understand the potential for hydroelectric development. Daniel and John traveled to Scammon Bay on 21 July 2014 via Alaska Airlines out of Anchorage and Grant Aviation out of Bethel (twin engine Navajo). Weather nearly prohibited successful arrival in Scammon Bay due to very strong cross winds. Daniel and John were housed at the new water treatment plant for their stay. On the following day, 22 July 2014, weather was decent and the boat rental was arranged to perform the aquatic investigations at Ekashluak Creek. After returning to Scammon Bay minnow fish traps with bait were set in Hillside Creek. Flow measurements were also taken. The following day, 23 July 2014, traps were pulled from Hillside Creek followed by electro fishing in the vicinity of the proposed powerhouse site. A community council meeting was also being held that day where Daniel was able to present the current understanding of development options and obtain comments and feedback from the council members. Daniel and John departed Scammon Bay that afternoon, 23 July 2014, on a Cessna Caravan and returned to Anchorage that evening. H347306-trip report, Rev. 0 Page 2 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. 2. Weather Local residents indicated that the creeks were very low as of a month ago until a significant amount of rain fell over the past two weeks. For the period of July 1 through July 24 the average temperature was 53 deg F and 7.41 inches of rain fell according the FAA ASOS station PACM1. The chart below shows the temperature, wind speed, and precipitation from July 1 through 24. 3. Aquatic Investigations John performed the aquatic investigations and will file a trip report with the Alaska Department of Fish and Game and make anadromous nominations as required by regulation. The following is a summary aquatic investigation results. Investigations for fish species presence was made on Towak Creek, Ekashluak Creek, Kuwiakpuk (unsure of spelling) Creek, and the unnamed (Hillside) creek that runs through the community of Scammon Bay. Stream Body Fish species observed Estimated upstream limit of presence (river feet) Estimated Elevation (ft) Towak Creek Pink Salmon 670 40 Ekashluak Creek Pink Salmon, Dolly Varden 2400+ 150 Kuwiakpuk Creek Slimy Sculpin unnamed (Hillside) creek Dolly Varden 2680 70 1 http://mesonet.agron.iastate.edu/request/download.phtml?network=AK_ASOS 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 10 20 30 40 50 60 70 01Jul2014 05Jul2014 09Jul2014 13Jul2014 17Jul2014 21Jul2014 25Jul2014 Temperature(degF) WindSpeed(m/s) Precipitation(in) H347306-trip report, Rev. 0 Page 3 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. 4. Flow Measurements The flow in the unnamed (Hillside) Creek was measured three times during the site visit and was determined to be approximately 3.7 cfs on July 22 and 3.8 cfs on July 23. Measurement reports are attached. The following table summarizes the measurements. Date and Time Location Discharge (cfs) 21:40-22-Jul-2014 Hillside Creek fish barrier 3.8 21:54-22-Jul-2014 Hillside Creek fish barrier 3.7 14:32-23-Jul-2014 Hillside Creek fish barrier 3.8 5. Community Council Meeting Daniel provided the council with a summary of the feasibility study scope and the results of the preliminary analysis performed to date which indicated that the local creek that runs through the community was the preferred source for hydroelectric development and that is appeared to be economically feasible. Mr Hertrich also suggested using Hillside Creek and Hillside Hydroelectric Project as names in the study for the unnamed creek that runs through Scammon Bay and the proposed hydroelectric scheme. The concept of locating the proposed powerhouse to the lowest practical downstream elevation, a site situated on lot 5 of block 12 at an elevation of about 20 feet was undesirable because of the expected lack of flow when the creek is bypassed by the hydro project. The lower portion of the creek is utilized a variety of purposes by the community. 6. Recommendations Establish the proposed powerhouse site at an elevation of approximately 70' so that it is located above the fish barrier. This will eliminate complications with bypass flow requirements for aquatic species and alleviate concerns bypassing the portion of the creek that runs through the community. Daniel Hertrich Bering Pacific Engineering Flow Measurement Measuredby DanielHertrich Riverbody HillsideCreek NearestCommunity ScammonBay,Alaska LocationDescription Fishbarrierjustaboveculvert Latitude N 61d 50' 27.7" Record of Flow Measurement 7/28/2014 Page 1 of 1 Longitude W 165d 34' 59.1" Date 7/22/2014 Time 9:40 PM Procedure DilutionGagingProcedure InjectionSolutionBatch IS3 Volume dye, Vi 0.04 L Vi in ft^3 0 0014 ft^3Vi in ft^3 0.0014 ft^3 Dye Concentration, Ci 4865000 ppb Stream Temperature 42.6 deg F Sum of C * dt 1791.9 Discharge 3.8 cfs 1600 1800 2000 16.00 18.00 20.00 (ppbsec)Time ConcentrationChart 800 1000 1200 1400 1600 1800 800 10.00 12.00 14.00 16.00 18.00 Concentration*tint(ppbseentration(ppb)Cdt CumulativeConcentration 0 200 400 600 800 1000 0.00 2.00 4.00 6.00 8.00 10.00 CumulativeSumofConcenConcentratCumulative Concentration 00.00 9:38PM 9:39PM 9:40PM 9:41PM 9:42PM 9:43PM 9:44PM 9:45PM 9:46PM 9:47PM CuTime 7/28/2014 Page 1 of 1 Bering Pacific Engineering Flow Measurement Measuredby DanielHertrich Riverbody HillsideCreek NearestCommunity ScammonBay,Alaska LocationDescription Fishbarrierjustaboveculvert Latitude N 61d 50' 27.7" Record of Flow Measurement 7/28/2014 Page 1 of 1 Longitude W 165d 34' 59.1" Date 7/22/2014 Time 9:54 PM Procedure DilutionGagingProcedure InjectionSolutionBatch IS3 Volume dye, Vi 0.02 L Vi in ft^3 0 0007 ft^3Vi in ft^3 0.0007 ft^3 Dye Concentration, Ci 4865000 ppb Stream Temperature 42.6 deg F Sum of C * dt 933.0 Discharge 3.7 cfs 800 900 1000 700 8.00 9.00 t(ppbsec)Time ConcentrationChart 400 500 600 700 800 900 4.00 5.00 6.00 7.00 8.00 fConcentration*tint(ppbncentration(ppb)Cdt CumulativeConcentration 0 100 200 300 400 500 0.00 1.00 2.00 3.00 4.00 9:53PM 9:54PM 9:55PM 9:56PM 9:57PM 9:58PM 9:59PM 10:00 10:01 10:02 CumulativeSumofConceConcentraCumulative Concentration 00.00 9:53PM 9:54PM 9:55PM 9:56PM 9:57PM 9:58PM 9:59PM 10:00 PM 10:01 PM 10:02 PM CTime 7/28/2014 Page 1 of 1 Bering Pacific Engineering Flow Measurement Measuredby DanielHertrich Riverbody HillsideCreek NearestCommunity ScammonBay,Alaska LocationDescription Fishbarrierjustaboveculvert Latitude N 61d 50' 27.7" Record of Flow Measurement 7/28/2014 Page 1 of 1 Longitude W 165d 34' 59.1" Date 7/23/2014 Time 2:32 PM Procedure DilutionGagingProcedure InjectionSolutionBatch IS3 Volume dye, Vi 0.02 L Vi in ft^3 0 0007 ft^3Vi in ft^3 0.0007 ft^3 Dye Concentration, Ci 4865000 ppb Stream Temperature 45 deg F Sum of C * dt 912.3 Discharge 3.8 cfs 800 900 1000 700 8.00 9.00 (ppbsec)Time ConcentrationChart 400 500 600 700 800 900 4.00 5.00 6.00 7.00 8.00 Concentration*tint(ppbseentration(ppb)Cdt CumulativeConcentration 0 100 200 300 400 500 0.00 1.00 2.00 3.00 4.00 CumulativeSumofConcenConcentratCumulative Concentration 00.00 2:31PM 2:32PM 2:33PM 2:34PM 2:35PM 2:36PM 2:37PM 2:38PM 2:39PM CuTime 7/28/2014 Page 1 of 1 ABR, Inc. 1 Scammon Bay Hydroelectric Feasibility Survey ALASKA NATIVE TRIBAL HEALTH CONSORTIUM SCAMMON BAY HYDROELECTRIC FEASIBILITY STUDY SUMMARY OF FIELD WORK Prepared for Hatch Acres 6 Nickerson, Suite 101 Seattle, WA 98109 by John Seigle ABR, Inc.—Environmental Research & Services P.O. Box 240268 Fairbanks, AK 99524 August 2014 ________________________________________________________________________ INTRODUCTION In the spring of 2014 the Alaska Native Tribal Health Consortium (ANTHC) requested a feasibility study to determine the potential for hydroelectric projects near Scammon Bay, Alaska. Hatch prepared an analysis of the potential for hydroelectric projects on several small, high gradient streams in the Askinuk Mountains that flow north into the Kun River and Kongishluk Bay. Hatch requested that ABR, Inc—Environmental Research and Services (ABR) provide assistance in determining whether resident and anadromous fish populations exist in these streams. The objectives of this survey were to 1) assess the likelihood of resident or anadromous fish presence in the streams to be surveyed and 2) perform basic assessments of stream habitat conditions (e.g., gradient, flow). METHODS ABR biologist John Seigle travelled to Scammon Bay during 21–23 July 2014. On 22 July, John Seigle and Dan Hertrich (Hatch) travelled by boat with local hires to 3 streams, each with a general south to north flow regime emanating from the Askinuk Mountains and draining into ABR, Inc. 2 Scammon Bay Hydroelectric Feasibility Survey Scammon Bay. A fourth stream, located in the village of Scammon Bay was also surveyed during 22–23 July. From east to west, starting in Scammon Bay, these streams were Hillside Creek, Towak Creek, Ekashluak Creek, and Kawiakpak Creek (Figure 1). Visual observations of stream conditions and fish presence were made at Towak Creek, Ekashluak Creek, and Kawiakpak Creek. Fish surveys in Hillside Creek included visual observations and the use of minnow traps and a backpack electrofisher. During visual observations of fish presence, the stream corridor was surveyed downstream to upstream to the point at which the last spawning Pink Salmon (Oncorhynchus gorbuscha) was observed. GPS locations were marked for large spawning aggregations and to identify the upstream extent of observed spawning Pink Salmon. A photo log, including photos of spawning Pink salmon, was kept for each surveyed stream. Minnow traps were deployed in Hillside Creek during the evening of 22 July. A total of 9 traps were deployed in the lower creek starting near the creek’s confluence with the Kun River and extending upstream to what community members described as a barrier to upstream fish movement. An additional 2 minnow traps were deployed upstream of this apparent barrier. Minnow traps were baited with salmon roe which had previously been disinfected with a betadine solution. Traps were allowed to fish overnight and were retrieved on 23 July. All captured fish were identified to species, enumerated, and measured for fork length (mm). Fish were then returned live to the stream. Limited electrofishing was conducted upstream of the presumed barrier to upstream fish movement on Hillside Creek. Prior to fishing above the barrier, the electrofisher was tested in a small pool just below the barrier to ensure that the electrofisher settings were sufficient to stun juvenile fish without causing mortality. Once it was determined that the settings were correct, the stream was electrofished above the barrier. As Hillside Creek is primarily a high gradient plunge pool stream, electrofishing took place in a pool by pool basis for a total distance of ~500 feet upstream of the presumed barrier to fish migration. ABR, Inc. 3 Scammon Bay Hydroelectric Feasibility Survey INITIAL FINDINGS TOWAK CREEK The survey team observed Pink Salmon spawning at the mouth of Towak Creek (Table 1, Figure 1). While most spawning was limited to a series of pools near the mouth, several other spawning salmon were observed up to ~640 river feet upstream. There were no obvious barriers to salmon movement upstream from this location. However, the survey team walked an additional ~1,000 feet upstream without observing fish (Plates 1–5). EKASHLUAK CREEK Pink Salmon were observed at numerous locations from the stream mouth to ~2,400 river feet upstream (Figure 1). Though there were no barriers to immediate upstream movement of salmon, the substrate in this area of the stream began to transition from mixed gravel, cobble, and sand to larger boulders and cobble that are less suitable spawning habitats for Pink Salmon. The survey team hiked several hundred feet upstream of the upper-most observed salmon before returning to the boat. Several smaller fish were observed swimming throughout the stream over the observed area. A number of high gradient plunge pools were observed at the upper extent of the surveyed stream. It was thought that fish observed in or near these pools were likely Dolly Varden (Salvelinus malma). The stream itself is well oxygenated, with low conductivity and slightly acidic water (Table 1) (Plates 6–10). KAWIAKPAK CREEK The lower portion of Kawiakpak Creek near the mouth of the stream was high gradient (>5%) and unsuitable for migrating salmon. However, slimy sculpin (Cottus cognatus) were observed. The survey team walked upstream to several pools in search of additional fish species but none were observed (Plates 11–13). HILLSIDE CREEK Hatch had previously determined that the likely most economical project stream was Hillside Creek located in the community of Scammon Bay. Prior to fish sampling, we talked with community members to determine what fish might be present in this high gradient stream and to locate the likely upstream extent of fish migration. The children of the community often ABR, Inc. 4 Scammon Bay Hydroelectric Feasibility Survey fish for Dolly Varden (which they refer to simply as trout) in various plunge pools from the mouth upstream to a series of cascades that presumably act as a barrier to upstream migration for fish. A total of 31 Dolly Varden were captured in the minnow traps downstream of the presumed barrier to fish passage (Table 2). No fish were captured in minnow traps deployed upstream of the barrier. Electrofishing above the presumed barrier similarly captured no fish. Test electrofishing below the barrier was effective (~4 juvenile Dolly Varden surfaced), indicating that voltage settings were adequate to capture fish, had they been present above the barrier (Plates 14–20). SUMMARY The 3 streams surveyed to the west of Scammon Bay are not economically feasible hydroelectric project streams. Still, the results of visual observations in these streams will assist fisheries managers attempting to understand salmonid distribution in the region. ABR will nominate Towak Creek and Ekashluak Creek to the ADFG Anadromous Waters Catalog (AWC). Although survey efforts were minimal in these smaller streams, information gathered here will provide some of the first observations of salmonids in tributaries to the Kun River emanating from the Askinuk Mountains. No Pink Salmon were observed in the lower reaches of Hillside Creek during late July surveys in Scammon Bay. However, Dolly Varden are present throughout the lower reaches of the stream up to a set of barrier falls located at the south end of the village at ~70 feet elevation. Future discussions on hydroelectric facilities on Hillside Creek must consider fish passage and fish habitat issues related to Dolly Varden as required by the State of Alaska under the Anadromous Fish Act (AS 16.05.871) and the Fish Passage Act (AS 16.05.841). ABR, Inc. 5 Scammon Bay Hydroelectric Feasibility Survey Plate 1. Pink Salmon spawning pool in lower Towak Creek near the community of Scammon Bay, AK, July 2014. Plate 2. The outlet of Towak Creek, near the community of Scammon Bay, AK, July 2014. Plate 3. An underwater view of Pink Salmon in a pool in lower Towak Creek, near the community of Scammon Bay, AK, July 2014. Plate 4. Pink Salmon in lower Towak Creek, near Scammon Bay, AK, July 2014. ABR, Inc. 6 Scammon Bay Hydroelectric Feasibility Survey Plate 5. A view of the upstream extent of spawning Pink Salmon observered in Towak Creek, near the community of Scammon Bay, AK, July 2014. Plate 6. Looking upstream from the mouth of Ekashluak Creek near the community of Scammon Bay, AK, July 2014. Plate 7. Looking downstream toward the mouth of Ekashluak Creek near the community of Scammon Bay, AK, July 2014. Plate 8. An underwater view of a large aggregation of spawning pink salmon in Ekashluak Creek near the community of Scammon Bay, AK, July 2014. ABR, Inc. 7 Scammon Bay Hydroelectric Feasibility Survey Plate 9. A large aggregation of spawning pink salmon on Ekashluak Creek near the community of Scammon Bay, AK, July 2014. Plate 10. An upstream view at the upper extent of observed Pink Salmon spawning in Ekashluak Creek near the community of Scammon Bay, AK, July 2014. Plate 11. The outlet of Kawiakpak Creek near the community of Scammon Bay, AK, July 2014. Plate 12. A downstream view of the high gradient outlet of Kawiakpak Creek near the community of Scammon Bay, AK, July 2014. ABR, Inc. 8 Scammon Bay Hydroelectric Feasibility Survey Plate 13. An upstream view of the outlet of Kawiakpak Creek near the community of Scammon Bay, AK, July 2014. Plate 14. Looking downstream towards the Kun River from Hillside Creek (left) in the community of Scammon Bay, AK, July 2014. Plate 15. Looking downstream at the lower portion of Hillside Creek in the community of Scammon Bay, AK, July 2014. Plate 16. Looking upstream at a presumed barrier to fish migration on Hillside Creek in the community of Scammon Bay, AK, July 2014. ABR, Inc. 9 Scammon Bay Hydroelectric Feasibility Survey Plate 17. Measuring Dolly Varden caught in minnow traps in Hillside Creek in the community of Scammon Bay, AK, July 2014. Plate 18. Collecting minnow traps at the lower extent of fishing on Hillside Creek in the community of Scammon Bay, AK, July 2014. Plate 19. Electrofishing above the presumed barrier to fish passage on Hillside Creek in the community of Scammon Bay, AK, July 2014. Plate 20. Dan Hertrich of Hatch performing dye test to measure stream discharge in Hillside Creek in the community of Scammon Bay, AK, July 2014. ABR, Inc. 10 Scammon Bay Hydroelectric Feasibility Survey Table 1. Locations and general information for streams surveyed during the hydroelectric feasibility study near Scammon Bay, AK,July 2014. Towak Creek Ekashluak Creek Kawiakpak Creek Hillside Creek Date 7/22/2014 7/22/2014 7/22/2014 7/23/2014 Latitude 61.82227456 61.8253964 61.828301 61.84312228 Longitude -165.8750811 -165.9047288 -165.921218 -165.5853319 Fishing method VOa VOa VOa VO, MT, EFaSpecies Observed Pink Salmon Pink Salmon, Dolly Varden Sculpin Dolly Varden Flow (cfs) — 10c — 3.8 Temperature (°C) — 8.2 — 7 DOb (%, mg/L) — 103.6, 12.18 — 105.3, 12.79 Conductivity (µS/cm) — 25.8 — 20.1 pH — 6.33 — 6.3 Grade (%) 1–2 1–5 2–5 2–5 a VO = Visual Observation, MT = Minnow Trap, EF = Electrofish b DO = Dissolved Oxygen cHatch believes that the sampling device may have underestimated flow slightly on Ekashluak Creek. ABR, Inc. 11 Scammon Bay Hydroelectric Feasibility Survey Table 2. Location of sampling survey results for fish sampling in Hillside Creek in Scammon Bay, AK, July 2014. Trap Latitude Longitude Time In Time Out Time Fished Number of Fish Fish lengths (mm)a1 61.840764 -165.581109 7/22/2014 21:33 7/23/2014 10:40 13:07 3 103, 99, 154 2 61.841009 -165.583018 7/22/2014 21:45 7/23/2014 10:44 12:59 2 150, 164 3 61.841232 -165.582953 7/22/2014 21:52 – – – – 4 61.841613 -165.583473 7/22/2014 21:59 7/23/2014 10:57 12:58 3 171, 147, 130 5 61.84201 -165.584597 7/22/2014 22:11 7/23/2014 11:07 12:56 12 147, 122, 124, 121, 187, 120, 154, 125, 86, 123, 87, 82 6 61.842458 -165.584982 7/22/2014 22:20 7/23/2014 11:21 13:01 8 134, 114, 112, 149, 134, 125, 127, 109 7 61.842445 -165.584967 7/22/2014 22:27 7/23/2014 11:20 12:53 0 – 8 61.843122 -165.585332 7/22/2014 22:33 7/23/2014 11:27 12:54 3 131, 102, 104 9 61.843122 -165.585332 7/22/2014 22:33 7/23/2014 11:30 12:57 0 – 10 61.840344 -165.583459 7/22/2014 22:55 7/23/2014 10:32 11:37 0 – 11 61.84034 -165.58339 7/22/2014 23:01 7/23/2014 10:32 11:31 0 – a Only Dolly Varden were observed in Hillside Creek ####################SCAMMONBAY¤SeeDetailInset¤SeeDetailInset00.511.5Miles0 0.5 1 1.5 2KilometersMapMapViewViewALASKAALASKABarrowBarrowChukchiSeaGulf ofAlaskaBeringSeaFairbanksFairbanksBethelBethelAnchorageAnchorageUpstream observed Pink Salmon spawningPink Salmon spawning poolObserved sculpin##Minnow TrapElectrofish StartElectrofish End####################TwinHillsCreek0 2,000 4,000 Feet01,5003,000FeetFigure 1.Study area for theScammon Bay Feasibility StudyScammon_Bay_Fish_14-223.mxd20 August 2014Map prepared by:ABR Inc.–Environmental Research & ServicesService Layer Credits: Copyright:© 2013 National Geographic Society, i-cubed: Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project , Rev. 0 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. Appendix B - Economics B.1 Proposed Project Cost Estimate, 15 September 2014, 3 pages B.2 Economic Analysis Results, 15 September 2014, 1 page ProposedProjectCostEstimateScammonBayHydroelectricFeasibilityStudyTotal# units Labor HoursLaborRateLabor Cost Unit Cost Equip Cost Unit Unit Cost Materials Cost Area per UnitShip Unit CostShip Cost Item CostConstructionSupportProcurement,Submittals 1 1 wks 60 $125 $7,500$7,500SWPP 1 1 wks 60 $125 $7,500$7,500Survey 2 1 wks 120 $150 $18,000$18,000Planning 1 1 wks 60 $125 $7,500$7,500OfficeSupport 12 0.5 wks 357 $125 $44,652$44,652Asbuiltandcloseout 2 1 wks 120 $125 $15,000$15,000Mechanic 2.6 0.3 mos 179 $125 $22,326$22,326Housingandmeals 250 ManDays$300 $75,016 $75,016Contractorpassengertravel 18 trips 286 $125 $35,722$1,000 $17,861 $53,583MobilizationPipe 7 cont$19,200 $134,400 $134,400Building 4 cont$14,080 $56,320 $56,320Concrete(20kcontainerlimit) 5 cont$11,520 $57,600 $57,600Dam,piping,misc 1 cont$14,080 $14,080 $14,080MiscEquipment 3 cont$14,080 $42,240 $42,240Transformer,WireandElectrical 1 cont$14,080 $14,080 $14,080Turbine,Generator,andSwitchgear 1 cont$14,080 $14,080 $14,080Tailrace 1 cont$14,080 $14,080 $14,080AccessTrail4300ftclearingandoverburdenremoval 2.4 acres 47 $90 $4,264$4,264geogrid 7644 0.05 manhr 382 $90 $34,400 sqyds $10 $76,444 $110,844Minorculverts 3 24 $90 $2,160 ea $1,200 $3,600 $5,760GradeandFill 1274 133 $90 $12,013 cyd $25 $31,852 $43,865fuel 1085gal $7.40 $8,030 $8,030Super 1 147 $125 $18,346$18,346Powerhouseclearing 480 0.06 manhr 26 $90 $2,380 sqft$2,380excavation,disposal,andfill 142 0.5 manhr 71 $90 $6,400 cyd$6,400PowerhousePlanArea 320 sqftPremixconcrete 29 15.2 manhr 442 $102 $44,872 cyd $691 $20,050 $64,922Subgradeinsulation 360sqft $1.6 $563 $563Metalbuildingshell 320sqft $100 $32,000 $32,000architectural 320sqft $50 $16,000 $16,000electrical,mechanical 320sqft $40 $12,800 $12,800doors 320sqft $25 $8,000 $8,000foreman 1 0.3 crewhr 80 $125 $10,000$10,000Labor 3 0.8 manhr 240 $90 $21,600$21,600Specialty 1 0.3 manhr 80 $125 $10,000$10,000MobilizationItem Production per UnitLabor Equipment Material9/15/2014Page1 ProposedProjectCostEstimateScammonBayHydroelectricFeasibilityStudyTotal# units Labor HoursLaborRateLabor Cost Unit Cost Equip Cost Unit Unit Cost Materials Cost Area per UnitShip Unit CostShip Cost Item CostMobilizationItem Production per UnitLabor Equipment MaterialDamandIntakeDamConcrete 37 30.5 manhr 1128 $102 $114,501 cyd $691 $25,581 $140,082Intake(Coanda)Screen 32 1.5 manhr 48 $90 $4,320 sqft $400 $12,800 $17,120Precastvaults 4 4 manhr 16 $90 $1,440 lf $610 $2,438 $3,878ShutoffGate/Valve 2 32 $90 $2,880 ea $5,500 $11,000 $13,880AirVent 1 40 $90 $3,600 ea $3,500 $3,500 $7,100TrashRack 1 48 $90 $4,320 ea $3,000 $3,000 $7,320Super 219 $125 $27,330$27,330Insulation 384 0.047 manhr 18 $125 $2,250 sqft $35 $13,440 $15,690Fuel 1128gal $7.40 $8,346 $8,346Power,Controls,andCommunicationcontrols 1 16 manhr 16 $125 $2,000 ea $7,500 $7,500 $9,500powerline,communications 4320 0.02 manhr 72 $90 $6,480 ft $3.00 $12,960 $19,440Pipeline4320ftHDPE 4300 0.125 manhr 538 $90 $48,375 ft $38 $163,218 $211,593TraceandCommwiring 4320 0.01 manhr 43 $90 $3,888 ft $6 $25,920 $29,808Drainpipe 4320 0.015 manhr 65 $90 $5,832 ft $2 $8,640 $14,472Electrofusionfittings 108 1 manhr 108 $90 $9,720 ea $700 $75,600 $85,320Steel 20 0.8 manhr 16 $90 $1,440 ft $50 $1,000 $2,440flangekits 3 8 manhr 24 $90 $2,160 ea $1,500 $4,500 $6,660drains/airreliefs 3 8 manhr 24 $90 $2,160 ea $500 $1,500 $3,660anchors/thrustblocks 4 24 manhr 96 $90 $8,640 ea $1,200 $4,800 $13,440Super 152 $125 $19,031$19,031Specialty 152 $125 $19,031$19,031fuel 1370gal $7.40 $10,140 $10,140TurbineandGeneratorTurbineandGenerator 1ea $325,000 $325,000 $325,000ControlsIntegration 1ea $50,000 $50,000 $50,000switchgear 1ea $50,000 $50,000 $50,000transformer 1ea $25,000 $25,000 $25,000Labor 1 120 hrs 120 $90 $10,800$10,800Super 0.5 120 hrs 60 $125 $7,500$7,500specialty 1 120 hrs 120 $125 $15,000$15,000Tailraceturbinebypass 1 32 $90 $2,880 ea $7,500 $7,500 $10,38024"tailracechannel 20ft $50 $1,000 $1,000Super 1 0.4 hrs 8 $125 $1,000$1,000Labor 4 0.4 hrs 32 $90 $2,880$2,8809/15/2014Page2 ProposedProjectCostEstimateScammonBayHydroelectricFeasibilityStudyTotal# units Labor HoursLaborRateLabor Cost Unit Cost Equip Cost Unit Unit Cost Materials Cost Area per UnitShip Unit CostShip Cost Item CostMobilizationItem Production per UnitLabor Equipment MaterialTransmissiontransmissionline 0.02miwire 300 0.12 36 $90 $3,240 ft $3.00 $900 $4,140misc 1 40 $90 $3,600 ea $6,000 $6,000 $9,600Super 1 25 $125 $3,167$3,167Equipmentelectrofusionmachine 1 1 ea $4,000 $4,000$4,0004wheelers 2 1 ea $9,000 $18,000$18,0001.5yardmobilemixer 1 1 ea $45,000 $45,000 400 $65 $26,000 $71,000smallgenerator 2 1 ea $2,000 $4,000$4,000largegenerator 1 1 ea $7,500 $7,500$7,500smallloader 1 4.0 mo $5,500 $21,887 300 $70 $42,000 $63,887Enddump 1 4.0 mo $6,500 $25,866 200 $110 $44,000 $69,866Excavator 2 4.0 mo $12,000 $95,505 200 $110 $88,000 $183,505rockhammer 1 4.0 mo $2,500 $9,948$9,948aircompressor 1 4.0 mo $800 $3,184$3,184miscellaneoustools 1 1 ea $25,000 $25,000$25,000SUBTOTAL,ContractorDirectCosts 5,801 $619,229 $259,890 $1,050,573 $639,757 $2,569,448ContractorIndirectsWeatherdelay(%ofLaborandEquip) 10%$87,912Overallcontingency 25%$642,362contractorprofit 10%$256,945bonding 2.0%$51,389SUBTOTAL,ConstructionContract$3,608,056DevelopmentCostsStreamGaugingandPermitting 4.2%$150,000GeotechnicalandSurveying 4.2%$150,000Engineering 6.2%$225,000inspectionandtesting 2.1%$75,000owneradmin 1.4%$50,000TOTALPROJECT$4,258,0569/15/2014Page3 EconomicAnalysisResultsScammonBayHydroelectricFeasibilityStudySUM50 $60,390,587 $66,960,587 $47,775,088 $6,570,000 $54,345,088 $4,258,056 $689,805 $59,292,949NPV50 $25,429,192 $28,810,083 $19,963,830 $3,380,891 $23,344,721 $3,796,282 $368,598 $27,509,600TotalDiesel+HydroElectricGenerationDieselOnlyElectricGeneration9/15/2014Page1Year FuelPrice DemandDieselFuelUsed DieselFuelCost TotalDieselCost DieselFuelUsed,gal DieselFuelCost DieselO&M TotalDieselCost HydroCost HydroO&MHydro+DieselCostWindElectricEnergyPotential2014 4.00 1,704,597 121,897 487,586 618,986 121,897 $487,586 131,400 $618,986 $0 $0 $618,986 1,702,91720154061 738 689123 890502 993634 393123 890$502 993131 400$634 393$75 000$0$709 3931 737 00920154.061,738,689123,890502,993634,393123,890$502,993131,400$634,393$75,000$0$709,3931,737,0092016 4.12 1,773,463 125,923 518,916 650,316 125,923 $518,916 131,400 $650,316 $337,500 $0 $987,816 1,771,7832017 4.18 1,808,932 127,997 535,374 666,774 127,997 $535,374 131,400 $666,774 $3,845,556 $0 $4,512,330 1,807,2522018 4.25 1,845,111 130,112 552,385 683,785 90,179 $382,849 131,400 $514,249 $85,161 $599,410 587,75120194311 882 013132 270569 968701 36892 157$397 118131 400$528 518$42 581$571 099617 55720194.311,882,013132,270569,968701,36892,157$397,118131,400$528,518$42,581$571,099617,5572020 4.37 1,919,653 134,470 588,143 719,543 94,175 $411,902 131,400 $543,302 $12,774 $556,076 647,9582021 4.44 1,958,047 136,715 606,931 738,331 96,234 $427,219 131,400 $558,619 $12,774 $571,393 678,9672022 4.51 1,997,207 139,005 626,352 757,752 98,333 $443,088 131,400 $574,488 $12,774 $587,262 710,597$$$$2023 4.57 2,037,152 141,340 646,428 777,828 100,475 $459,529 131,400 $590,929 $12,774 $603,703 742,8592024 4.64 2,077,895 143,722 667,183 798,583 102,660 $476,563 131,400 $607,963 $12,774 $620,737 775,7672025 4.71 2,119,453 146,152 688,640 820,040 104,888 $494,210 131,400 $625,610 $12,774 $638,384 809,3332026 4.78 2,161,842 148,682 711,069 842,469 107,162 $512,498 131,400 $643,898 $12,774 $656,672 846,372,,,,,,,,,,,,2027 4.85 2,205,078 151,282 734,354 865,754 109,481 $531,446 131,400 $662,846 $12,774 $675,620 885,1912028 4.93 2,249,180 153,933 758,434 889,834 111,848 $551,076 131,400 $682,476 $12,774 $695,250 924,7852029 5.00 2,294,164 156,638 783,336 914,736 114,261 $571,411 131,400 $702,811 $12,774 $715,586 965,1722030 5.08 2,340,047 159,397 809,089 940,489 116,723$592,478 131,400$723,878$12,774$736,652 1,006,36720305.082,340,047159,397809,089940,489116,723$592,478131,400$723,878$12,774$736,6521,006,3672031 5.15 2,386,848 162,211 835,723 967,123 119,234 $614,302 131,400 $745,702 $12,774 $758,476 1,048,3852032 5.23 2,434,585 165,081 863,268 994,668 121,795 $636,910 131,400 $768,310 $12,774 $781,084 1,091,2442033 5.31 2,483,276 168,008 891,756 1,023,156 124,407 $660,330 131,400 $791,730 $12,774 $804,504 1,134,96020345392 532 942170 995921 2201 052 620127 072$684 591131 400$815 991$12 774$828 7651 179 55020345.392,532,942170,995921,2201,052,620127,072$684,591131,400$815,991$12,774$828,7651,179,5502035 5.47 2,583,601 174,100 952,021 1,083,421 129,917 $710,416 131,400 $841,816 $12,774 $854,590 1,226,9452036 5.55 2,635,273 177,323 984,189 1,115,589 132,935 $737,821 131,400 $869,221 $12,774 $881,995 1,277,0392037 5.63 2,687,978 180,610 1,017,470 1,148,870 136,013 $766,228 131,400 $897,628 $12,774 $910,403 1,328,13520385722 741 738183 9631 051 9041 183 304139 152$795 674131 400$927 074$12 774$939 8481 380 25320385.722,741,738183,9631,051,9041,183,304139,152$795,674131,400$927,074$12,774$939,8481,380,2532039 5.80 2,796,573 187,383 1,087,532 1,218,932 142,355 $826,195 131,400 $957,595 $12,774 $970,370 1,433,4132040 5.89 2,852,504 190,872 1,124,394 1,255,794 145,621 $857,831 131,400 $989,231 $12,774 $1,002,005 1,487,6362041 5.98 2,909,554 194,430 1,162,535 1,293,935 148,953 $890,619 131,400 $1,022,019 $12,774 $1,034,794 1,542,944$$$$2042 6.07 2,967,745 198,059 1,201,999 1,333,399 152,351 $924,603 131,400 $1,056,003 $12,774 $1,068,778 1,599,3582043 6.16 3,027,100 201,838 1,243,309 1,374,709 155,963 $960,722 131,400 $1,092,122 $12,774 $1,104,896 1,658,2322044 6.25 3,087,642 205,721 1,286,231 1,417,631 159,699 $998,490 131,400 $1,129,890 $12,774 $1,142,664 1,718,7542045 6.35 3,149,395 209,680 1,330,654 1,462,054 163,510 $1,037,649 131,400 $1,169,049 $12,774 $1,181,823 1,780,488,,,,,,,,$, ,,$, ,$,$, ,,,2046 6.44 3,212,383 213,720 1,376,631 1,508,031 167,396 $1,078,249 131,400 $1,209,649 $12,774 $1,222,423 1,843,4562047 6.54 3,276,631 217,839 1,424,215 1,555,615 171,361 $1,120,341 131,400 $1,251,741 $12,774 $1,264,515 1,907,6832048 6.64 3,342,163 222,042 1,473,464 1,604,864 175,404 $1,163,980 131,400 $1,295,380 $12,774 $1,308,154 1,973,1952049 6.74 3,409,006 226,328 1,524,436 1,655,836 179,529$1,209,221 131,400$1,340,621$12,774$1,353,395 2,040,01720496.743,409,006226,3281,524,4361,655,836179,529$1,209,221131,400$1,340,621$12,774$1,353,3952,040,0172050 6.84 3,477,187 230,734 1,577,423 1,708,823 183,803 $1,256,577 131,400 $1,387,977 $12,774 $1,400,751 2,108,1972051 6.94 3,546,730 235,228 1,632,269 1,763,669 188,162 $1,305,676 131,400 $1,437,076 $12,774 $1,449,850 2,177,7412052 7.04 3,617,665 239,811 1,689,038 1,820,438 192,609 $1,356,579 131,400 $1,487,979 $12,774 $1,500,753 2,248,67520537153 690 018244 4871 747 7991 879 199197 144$1 409 351131 400$1 540 751$12 774$1 553 5262 321 02820537.153,690,018244,4871,747,7991,879,199197,144$1,409,351131,400$1,540,751$12,774$1,553,5262,321,0282054 7.26 3,763,819 249,256 1,808,620 1,940,020 201,770 $1,464,060 131,400 $1,595,460 $12,774 $1,608,234 2,394,8292055 7.36 3,839,095 254,121 1,871,580 2,002,980 206,492 $1,520,794 131,400 $1,652,194 $12,774 $1,664,968 2,470,1052056 7.48 3,915,877 259,093 1,936,822 2,068,222 211,360 $1,579,997 131,400 $1,711,397 $12,774 $1,724,172 2,546,88720577593 994 194264 1652 004 3552 135 755216 325$1 641 374131 400$1 772 774$12 774$1 785 5482 625 20520577.593,994,194264,1652,004,3552,135,755216,325$1,641,374131,400$1,772,774$12,774$1,785,5482,625,2052058 7.70 4,074,078 269,338 2,074,259 2,205,659 221,390 $1,705,000 131,400 $1,836,400 $12,774 $1,849,175 2,705,0892059 7.82 4,155,560 274,614 2,146,618 2,278,018 226,556 $1,770,958 131,400 $1,902,358 $12,774 $1,915,133 2,786,5702060 7.93 4,238,671 279,996 2,221,519 2,352,919 231,826 $1,839,331 131,400 $1,970,731 $12,774 $1,983,506 2,869,681$$$$2061 8.05 4,323,444 285,476 2,298,971 2,430,371 237,222 $1,910,378 131,400 $2,041,778 $12,774 $2,054,552 2,954,4552062 8.17 4,409,913 291,062 2,379,113 2,510,513 242,734 $1,984,089 131,400 $2,115,489 $12,774 $2,128,263 3,040,9242063 8.30 4,498,112 296,759 2,462,068 2,593,468 248,357 $2,060,496 131,400 $2,191,896 $12,774 $2,204,670 3,129,1229/15/2014Page1 Alaska Native Tribal Health Consortium - Hydroelectric Feasibility Study, Scammon Bay, AK Hillside Creek Project , Rev. 0 © Hatch 2014 All rights reserved, including all rights relating to the use of this document or its contents. Appendix C - Concept Drawings C.1 H347306-G1, Project Map, 15 September 2014, 1 page C.2 H347306-C1, Site Map, 15 September 2014, 1 page C.3 H347306-C2, Diversion and Intake General Arrangement, 15 September 2014, 1 page C.4 H347306-C3, Powerhouse Site Plan and General Arrangement, Access Road Section, 15 September 2014, 1 page 500250750POWERHOUSEINTAKEPENSTOCK AND ACCESS TRAILSEC 10T20N, R90WSEC 3T20N, R90WSEC 9T20N, R90WSEC 4T20N, R90WSEC 15T20N, R90WSEC 10T20N, R90WSEC 16T20N, R90WSEC 9T20N, R90WSCAMMON BAY,PROJECT LOCATIONPROJECT MAPHILLSIDE CREEKWEST CREEKEKASHLUAK CREEKKAWIAKPAK CREEKHILLSIDE CREEK HYDROELECTRIC PROJECTDescriptionThe Hillside Hydro is a proposed run of river hydroelectricproject with a peak capacity of 200kW. The project woulddivert up to 6 cfs from Hillside Creek to a powerhouselocated in Scammon Bay for electric generation.Project DeveloperCity of Scammon BayPO Box 90Scammon Bay, Alaska, 99662(907) 558-5529Contracting AgentAlaska Native Tribal Health ConsortiumDivision of Environmental Health and Engineering3900 Ambassador Drive, Suite 301Anchorage, AK 99508LocationThe project is located near community of Scammon Bay, in theWade-Hampton census area (unorganized borough) of the Stateof Alaska and is within the USGS quadrangle Hooper Bay D-2,and located within section 9 and 10 of township 20 north, range90 west of the Seward Meridian.The approximate location of the proposed intake is 61°49.9' N,165°35.7' W, 550 feet elevation and powerhouse is 61°50.5' N,165°35.1' W, 70 feet elevation.Affected WatersHillside Creek (not in ADF&Gcatalog)Intake watershed area = 0.73square milesAverage Monthly Flows, cfs(Hydrology Data):Month Flow (cfs)January 0.6February 1.1March 2April 2.5May 5June 6July 4August 2September 3October 3November 2December 1Project Scheme Details (2014)Annual Energy Potential 760,000 kWhAnnual Demand Displaced 650,000 kWhAnnual Diesel Fuel Savings 40,000 galHydraulic Capacity 6 cfsStatic Head 480 ftInstalled Capacity 190 kWPenstock, 16" diameter 4,300 ftVICINITY MAPSCALE: 1" = 2 MILEPROJECT MAPSCALE: 1" = 1000'1 INCH1 INCH0.50.250.25SOURCE DATAUSGS MAP: Enhanced digital raster graphic from 1977 USGS quad map Hooper Bay D-2, publishedby Beartooth Mapping, Inc.COMMUNITY MAPPING AND ORTHOPHOTO: Property boundaries, roads, buildings, detailedcommunity area contours, and aerial orthophoto obtained from State of Alaska, Department ofCommerce, Community, and Economic Development, Division of Community and Regional Affairs,Scammon Bay community map. This map was prepared by Coastal Villages Region Fund (CVRF)in cooperation with the Alaska Department of Commerce, Community, and Economic Development(Commerce) using funding from Commerce, CVRF, Alaska Coastal Management Program, AlaskaVillage Electric Cooperative Inc., and funding from the Initiative for Accelerated InfrastructureDevelopment (IAID). The IAID is supported by grants from the Denali Commission, USDA RuralDevelopment, Alaska Department of Transportation and Public Facilities and Commerce. CoastalVillages Region Fund contracted with Global Positioning Services Incorporated in May of 2007 toprepare the map.HYDROLOGY DATA: Average monthly discharge data for Hillside Creek obtained from AlaskaPower Authority Findings and Recommendations Scammon Bay December 5, 1985 report usingthe Department of Army Corps of Engineers September 18, 1984 Memorandum revised dischargedata.USGS MAP 500250750POWERHOUSEINTAKEPENSTOCK AND ACCESS TRAILSEC 10T20N, R90WIC 958 Askinuk CorporationSEC 3T20N, R90WIC 958 Askinuk CorporationSEC 9T20N, R90WIC 958 Askinuk CorporationSEC 4T20N, R90WIC 958 Askinuk CorporationSEC 15T20N, R90WSEC 10, T20N, R90W, IC 958 Askinuk CorporationSEC 16T20N, R90WSEC 9, T20N, R90W, IC 958 Askinuk CorporationWATERSHED AREA= 0.73 SQ MIKUN RIVERHILLSIDE CREEKQUARRY SITEQUARRY SITELANDFILLHILLSIDE CREEK HYDROELECTRIC PROJECTDRAWINGSH347306 - G1 PROJECT MAPH347306 - C1 SITE MAPH347306 - C2 DIVERSION AND INTAKE GENERAL ARRANGEMENTH347306 - C3 POWERHOUSE GENERAL ARRANGEMENTSITE MAPSCALE: 1" = 1500'1 INCH1 INCH0.50.250.25SOURCE DATAUSGS MAP: Enhanced digital raster graphic from 1977 USGS quad map Hooper Bay D-2, publishedby Beartooth Mapping, Inc.COMMUNITY MAPPING AND ORTHOPHOTO: Property boundaries, roads, buildings, detailedcommunity area contours, and aerial orthophoto obtained from State of Alaska, Department ofCommerce, Community, and Economic Development, Division of Community and Regional Affairs,Scammon Bay community map. This map was prepared by Coastal Villages Region Fund (CVRF)in cooperation with the Alaska Department of Commerce, Community, and Economic Development(Commerce) using funding from Commerce, CVRF, Alaska Coastal Management Program, AlaskaVillage Electric Cooperative Inc., and funding from the Initiative for Accelerated InfrastructureDevelopment (IAID). The IAID is supported by grants from the Denali Commission, USDA RuralDevelopment, Alaska Department of Transportation and Public Facilities and Commerce. CoastalVillages Region Fund contracted with Global Positioning Services Incorporated in May of 2007 toprepare the map.HYDROLOGY DATA: Average monthly discharge data for Hillside Creek obtained from AlaskaPower Authority Findings and Recommendations Scammon Bay December 5, 1985 report usingthe Department of Army Corps of Engineers September 18, 1984 Memorandum revised dischargedata. 60 10 0 11 0 12 0 13 0 140 150 160 1 7 0 1 8 0 19 0 90 100 110 120 130 140 150 160 170 APPROXIMATE LOCATIONOF NEW WATERTREATMENT PLANTPROPOSED POWERHOUSE AND TAILRACEPROPOSED ACCESS TRAILPENSTOCKUPPER LIMIT OF FISH PRESENCEEXISTING WATER INTAKEWATER STORAGE TANKHILLSIDE CREEKLOT 4, USS 4099SURFACE ESTATE ASKINUK CORPORATION(DOC 2012-000409-0, BETHEL REC DISTRICT)MARKER TAPE#10 BARE COPPER WITH HDPEPENSTOCKPER OSHA REQ6"1'BEDDINGSELECT FILLACCESS TRAIL3'1'16'20'16'GENERATORSWITCHGEARMAN DOORLOADING DOORPAD / ROADPELTON TURBINETAILRACEPENSTOCKVALVEPOWERHOUSE GENERAL ARRANGEMENTSCALE: 1" = 5'1 INCH1 INCH0.50.250.25ACCESS TRAILSCALE: NTSPENSTOCK AND TRAIL SECTIONSCALE: 3/8" = 1'POWERHOUSE SITE PLANSCALE: 1" = 150' 1225 East International Airport Rd., Suite 110 Anchorage, AK, USA 99518 Tel +1 (907) 561 2800 Fax +1 (907) 561 2802