Condit Dam Removal Condit Dam Removal - Access Washington

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Condit Dam Hydroelectric Project Final Supplemental EIS Air Quality There are unlikely to be any significant unavoidable adverse impacts from demolition of the Condit Dam if the mitigation measures are implemented fully and in a timely fashion. Noise Several residences (i.e., sensitive noise receptors) are located adjacent to the dam, the concrete disposal site, and the roads along which trucks and construction equipment would travel during the proposed action. Intermittently, construction noise levels at these residences would significantly exceed the modeled noise levels. The noise levels at these sensitive receptors due to construction activities do not exceed state or local noise standards due to exemptions for construction in the Klickitat County, Skamania County, and State of Washington noise regulations. However, construction noise impacts to adjacent residential properties would be significant due to the duration and intensity of noise that would be received. Therefore, construction noise impacts to adjacent residential properties are considered a short-term significant unavoidable adverse impact for the proposed action. Land Use/Critical Areas If the PacifiCorp Sediment Assessment and Management, Bank Stabilization, and Canyon and Woody Debris Management Plans (PacifiCorp 2004) are implemented, no long-term unavoidable significant adverse impacts to land use/critical areas are anticipated. There would be short-term unavoidable impacts to sites along or near the reservoir that would be used for work areas, construction staging or for disposal, and from the access roads that would be built in several locations. Aesthetics and Scenic Resources Short-term significant unavoidable adverse impacts to views along the reservoir would occur until revegetation occurs and the free flowing river is reestablished. One overall significant long-term change to aesthetics and scenic resources would remain and would be unavoidable. That would be the change from a lake view to a view of a stream corridor. However, depending on one’s perception, this may or may not be a significant impact. Public Safety If the proposed mitigation measures for public safety are implemented, no significant unavoidable impacts are expected. Public Services If the Public Safety and Traffic Control Management Plans prepared by PacifiCorp (2004) are implemented, no significant unavoidable adverse impacts are expected. 1.6.4 Secondary and Cumulative Effects Secondary or indirect effects are those that are caused by the proposed project that are later in time or farther removed in distance than direct impacts, but which are still reasonably foreseeable. Examples are changes in land use and economic vitality (including rate of new development, growth related to improved or changed access and travel conditions, pressure to more intensively develop existing areas, and population changes), and related effects on water quality and natural resources. 1-11
Condit Dam Hydroelectric Project Final Supplemental EIS Cumulative effects are impacts on the environment that result from the incremental consequences of a project when added to other past or reasonably foreseeable future actions (regardless of who would take the future action). The cumulative effects may be undetectable when viewed individually, but add to other disturbances and eventually lead to a measurable change. Examples are changes to land use, the loss of wetland areas, the elimination of wildlife habitats, changes in traffic and transportation, or increased noise levels. The removal of Condit Dam would have direct impacts on a number of elements of the environment during the pre-dam, dam breaching and removal, and post-removal management. Secondary and cumulative effects would primarily be limited to aquatic resources, transportation, and land use. Aquatic Resources The primary consideration for cumulative effects on aquatic resources is concern whether anadromous salmonid stocks that are already depressed by the effects of dams and reservoirs on the Columbia River and other influences will have the ability to recover from additional impacts of the sediment released from Northwestern Lake from the breaching of Condit Dam. The mitigation proposed to protect the fall Chinook salmon is trapping and hatchery rearing one yearclass appears to address the concern for that species. Another species of potential concern is the Columbia River chum salmon. It is probably not feasible to trap them for hatchery rearing, and it may not be possible to restore suitability in the following year to their spawning gravel unless storm flows in the White Salmon River are particularly favorable. However, long-term effects are viewed as beneficial. Transportation The proposed project would create approximately 25 full-time jobs and an estimated 200 vehicle trips per day from the dam removal site. With the majority of trips being located on-site (removal of debris to areas a few thousand feet upstream of the dam), the small increase in trips on local roads associated with the proposed project is not anticipated to create traffic congestion or a diminution of the level of service (LOS) at any affected intersection. Other approved projects in the area are not anticipated to have overlapping construction and/or demolition periods. It is anticipated that construction/demolition vehicles for these overlapping projects traveling into or out of Washington State would be via State Route (SR) 14 and not result in cumulative impacts on SR 141 or Powerhouse Road. Land Use/Critical Areas The change from a dam and lake to a free-flowing stream will likely change the long term land use characteristics around the stream. Future land use will be controlled by the comprehensive plan and zoning designations of the respective counties. 1-12
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Appendix A Memorandum of Agreement
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Appendix C Supplemental Aquatic Res
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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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