Condit Dam Removal Condit Dam Removal - Access Washington

Condit Dam Hydroelectric Project
Final Supplemental EIS
The issues identified by Ecology that required additional assessment as part of the SEPA process
are:
Local Permits
• Whether or not Klickitat County and Skamania County must issue permits, such as a
land use Conditional Use Permit, to allow concrete disposal outside of the shoreline
near the dam site.
Geology, Soils, and Sediment
• Increased erosion, sedimentation and turbidity in the White Salmon River from dam
breaching and removal, cofferdam removal, woody debris removal, and sediment
management.
Water Resources
• Impacts to water quality in the White Salmon River from concrete and explosives
residue contamination that may result from the construction of the drain tunnel or
from dam breaching and removal of the dam.
• Impacts to groundwater quality from leachate from disposal of concrete and other
construction debris.
• Increased turbidity in stormwater runoff resulting from construction of access roads
and disposal of dam hardware, woody debris, concrete, and cofferdam.
• Increased turbidity in Northwestern Lake or the White Salmon River as a result of
reinforcing Northwestern Lake Bridge and reconstructing the Mt. Adams Orchard
diversion.
• Impacts to water quality from fuel or oil spills from equipment or storage areas during
removal of the cofferdam, woody debris, or sediment.
Aquatic Resources
• Effects on fish (such as vibration from pile driving and spills from equipment) in
Northwestern Lake as a result of reinforcing Northwestern Lake Bridge and installing
the temporary water supply pipeline.
• Impacts to salmonids from increased turbidity, pH, or spills/leaks from mechanical
equipment in the reservoir or river.
• Impacts to salmonids from blasting during cofferdam and woody debris removal.
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