Condit Dam Removal Condit Dam Removal - Access Washington

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Condit Dam Hydroelectric Project Final Supplemental EIS The City of White Salmon’s 14-inch supply line across the reservoir would be affected by dam breaching and removal activities, potentially resulting in a disruption of service to water use customers. Post-Removal Management The proposed action would result in some impacts to the public service providers, although to a lesser extent than the pre-dam removal and dam breaching and removal activities. Impacts related to sediment management and safety could affect staffing as well as response times. Minimal impacts from post-removal management would occur on the water supply utilities if the pre-dam and dam removal impacts are mitigated. 4.12.3 Mitigation Measures PacifiCorp has proposed several mitigation measures for the pre-dam removal, dam removal, and post-removal management activities, including those listed below. The proposed mitigation measures are described further in the Public Safety and Traffic Control Management Plans prepared by (2004) PacifiCorp. • Coordinate with local police, fire and emergency service personnel on potentially hazardous areas, the schedule for blasting and dam breaching, and public notification. Continue this coordination for post-removal management activities. • Coordinate with the Washington State Patrol during dam removal and postremoval management activities affecting state highways. • Implement a traffic control plan during dam removal and post-removal management activities that provides for police, fire and emergency service access to minimize impacts to response times. • In coordination with the City of White Salmon, install a temporary water supply (probably 14-inch HDPE pipe) across the lake with a cable support system before the dam is breached. Install a permanent line after the dam is breached, low enough to be protected from river scour. 4.12.4 Significant Unavoidable Adverse Impacts If mitigation measures noted above are implemented, no significant unavoidable adverse impacts are expected. 4.12-2
Condit Dam Hydroelectric Project Final Supplemental EIS 5.0 REFERENCES Allen, M.B., P.J. Connolly, and K. Martens. 2003. Characterization of flow, temperature, habitat conditions, and fish populations in the Rattlesnake Creek watershed. In Assess current and potential salmonid production in Rattlesnake Creek associated with restoration efforts, 2002 Annual Report, Editor, P.J. Connolly. Contract No. 00005068, Project No. 2001-025-00. Prepared by U.S. Geological Survey. Bair, B., D. Grover, and P. Powers. 2002. Effects of the proposed Condit Dam removal on fish populations and habitat in the White Salmon Wild and Scenic River. U.S Forest Service, March 15, 2002. Bash, J., C. Berman, and S. Bolton. 2001. Effects of turbidity and suspended solids on salmonids. Prepared for the Washington State Department of Transportation, Olympia, Washington by the University of Washington, Center for Streamside Studies, Seattle, Washington. Beschta, R.L. and W.L. Jackson. 1979. The intrusion of fine sediments into a stable gravel bed. Journal of the Fisheries Research Board of Canada 36:204-204. Bisson, P.A., C.M. Crisafulli, B.R. Fransen, R.E. Lucas, and C.P. Hawkins. 2005. Responses of fish to the 1980 eruption of Mount St. Helens. In Ecological responses to the 1980 eruption of Mount St. Helens. Editors, V.H. Dale, F.J. Swanson, C.M. Crisafulli. Springer Science+Business Media, Inc., New York, New York. Blakley, A., B. Leland, and J. Ames (editors). 2000. 2000 salmonid stock inventory, coastal cutthroat trout. Washington Department of Fish and Wildlife, Olympia, Washington. Burgess, W.C., S.B. Blackwell, and R. Abbott. 2005. Underwater acoustic measurements of vibratory pile driving at the Pipeline 5 crossing in the Snohomish River, Everett, Washington. Report 322-2, Greeneridge Sciences, Inc., for URS Corporation (Project 33756899) and the City of Everett, Washington (Project UP 3148), February 3, 2005. Byrne, J. 2005. Phone conversation with Jim Byrne, Fisheries Biologist, Washington Department of Fish and Wildlife, Vancouver, Washington. June 7, 2005. Chapman, D.W., W.S. Platts, and M. Hill. 1990. Evaluation of introduction of anadromous salmonids upstream from Condit Dam in the White Salmon River, Washington. Prepared for PacifiCorp Electric Operations by Don Chapman Consultants, Inc. Boise, Idaho. December 20, 1990. CH2M Hill. 2003. Wetland Delineation and Functional Assessment Report for the Condit Hydroelectric Project Removal, FERC Project No. 2342. Prepared for PacifiCorp. Bellevue, Washington. August 20. 5-1
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Condit Dam Removal Final SEPA Suppl
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March 23, 2007 Dear interested part
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Condit Dam Hydroelectric Project Fi
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Agency and Organization Letters and
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Contents Public Meetings Response P
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Contents Individuals Individuals A-
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