Draft Study Plan Vol 1 (PDF) - Alaska Power and Telephone Company

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DRAFT DOCUMENT GWh HCMP HL&P ILP IPEC IRA KWh MBF mg/L MHW MLLW NMFS NOAA MWh NRCS NSRAA ppm TLP TMDL TWC USACE USEPA USF&WS USGS gigawatt-hour (1,000 megawatt-hours) Haines Coastal Management Plan Haines Light & Power Company Integrated Licensing Process Inside Passage Electric Cooperative Indian Reorganization Act (Federally recognized Tribal entities) kilowatt-hour (1,000 watt-hours) Million Board Feet milligrams per liter mean high water Mean Lower Low Water National Marine fisheries Service National Oceanographic and Atmospheric Administration megawatt-hour (1,000 kilowatt-hours) National Resource Conservation Service Northern Southeast Regional Aquaculture Association parts per million Traditional Licensing Process total maximum daily load Takshanuk Watershed Council U.S. Army Corps of Engineers U.S. Environmental Protection Agency U.S. Fish & Wildlife Service U.S. Geological Survey
DRAFT DOCUMENT CONNELLY LAKE HYDROELECTRIC PROJECT P-14229 DRAFT STUDY PLAN 1.0 INTRODUCTION The proposed Connelly Lake Hydroelectric Project (Project) will be located in Southeast Alaska, approximately 14 miles northwest of the City of Haines and 10 miles southwest of the City of Skagway, as shown in Figure 1. Connelly Lake (formerly known as Upper Chilkoot Lake) is a 90 acre alpine lake that drains into the Chilkoot River. The project will be on state and private land, including the Haines State Forest and Chilkat Bald Eagle Preserve. 1 2.0 PROJECT DESIGN Four different project designs are currently being considered, listed below. Field studies including economic and geotechnical analysis will influence the choice of the final design. The project designs being considered are as follows (a more complete description can be found in the Preliminary Application Document (PAD): Alternative 1 – No dam, siphon intake, surface penstock, upstream powerhouse location. This alternative, shown in Figure 3, would be a project similar in design to Goat Lake Hydro (GLH) existing Goat Lake and Black Bear Lake Hydroelectric Projects. The active storage would be limited to that available from the existing lake with a siphon intake. Due to the limited storage, the project would not be able to serve either Haines or cruise ship loads with 100% reliability. Access Road The existing access road (RS 2477) would be rebuilt along the west side of Chilkoot Lake and above the lake. This road would be a built for long term use with a better surface and appurtenances, i.e. culverts, bridges, than a logging road. A section of new access road about 1/4 mile long would be constructed to connect the existing road to the powerhouse, including a bridge across the Chilkoot River. The Chilkoot River in that area is quite dynamic, and the road design would need to allow for channel migration, probably by including multiple bridge spans. Dam The existing lake storage would be utilized through construction of a siphon intake, rather than use a dam. The active storage would be limited to the 1,250 acre-feet available with a drawdown of 20 feet (from the existing lake level at El 2278 to El 2258). Work at the lake would be limited to excavation of a 1,500-foot-long drawdown trench for the siphon pipe through a saddle in the ground at the south end of the lake, installation of the intake screen structure in the lake and the siphon pipe in the trench, installation of 1 Chilkat Bald Eagle Preserve is managed by DNR Parks and Outdoor Recreation. Draft Study Plan – June 2012 p. 1 Connelly Lake Hydroelectric Project
Page 1 and 2: June 6, 2012 To All Agencies and Ot
Page 3 and 4: All Agencies and Other Interested P
Page 5 and 6: DRAFT DOCUMENT CONNELLY LAKE HYDROE
Page 7: DRAFT DOCUMENT Figure 12: New bridg
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Page 21 and 22: DRAFT DOCUMENT Chilkoot River Valle
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Page 27 and 28: DRAFT DOCUMENT The logging road is
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Page 31 and 32: DRAFT DOCUMENT locations are summar
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Page 35 and 36: DRAFT DOCUMENT Impacts to Avian Spe
Page 37 and 38: DRAFT DOCUMENT The USF&WS, 18 help
Page 39 and 40: DRAFT DOCUMENT As seen in Figures 1
Page 41 and 42: DRAFT DOCUMENT The Steller sea lion
Page 43 and 44: DRAFT DOCUMENT Land Use The Project
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Page 49 and 50: DRAFT DOCUMENT review potential pro
Page 51 and 52: DRAFT DOCUMENT These studies will i
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Page 55 and 56: DRAFT DOCUMENT 7. Wildlife Habitat
Page 57: APPENDIX A 11 x 17 PROJECT DIAGRAMS
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MONTHLY FLOW DURATION CURVES (PRELI
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Connelly Lake Hydro Fisheries Repor
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LIST OF TABLES Table 1. Comparison
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B Powerhouse A Chilkoot Lake C Powe
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Figure 2. Project vicinity, feature
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The area within the Chilkoot River
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Dolly Varden was 3 fish, but ranged
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Connelly Lake Chilkoot River Figure
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Connelly Lake Chilkoot River Figure
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The mainstem of the Chilkoot river
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However, we did not catch Coho Salm
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APPENDIX I FIELD SURVEY PHOTOGRAPHS
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Juvenile Dolly Varden captured in R
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Beaver pond complex Site of helipad
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Beaver pond complex Downstream view
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Reeves Creek Lower end of Reeves Cr
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Power Creek Mouth of Power Creek Le
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New Chilkoot River side slough Upst
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New Chilkoot River side slough View
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Helipads Helipad #1 on road north o
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Helipads Helipad #3 on west bank of
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Appendix II Fisheries data for the
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148 59.38892995 ‐135.6527002 78 3
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APPENDIX D 2012 SEISMIC REFRACTION
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geophones will be those that have r
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8410 154 th Avenue NE Redmond, Wash
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Alaska Power & Telephone | April 18
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Notes 1. The locations of all featu
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APPENDIX F WATER QUALITY SAMPLING R
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Case Narrative Analytica Alaska Inc
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Workorder (SDG): Project: Client: D
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APPENDIX G STREAM GAGING CONNELLY L
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APPENDIX H CONNELLY LAKE, OUTLET ST
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The main (glacial) inlet stream to
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Trap catches in the lower section o
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Outlet to Glory Hole, looking upstr
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Culvert crossing at the tributary t
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Slough below stream #12. 28
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View of Bear Creek looking downstre
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Stream above stream # 13 flowing ac
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