Shoshone-Bannock Tribes - Idaho Power

Responses to CommentsIdaho Power CompanyRESPONSE TO COMMENT SBT1-31The referenced paragraph states that most of the changes in dissolved oxygen (DO)concentrations occur in Brownlee Reservoir, not that DO is being limited at Brownlee Dam.RESPONSE TO COMMENT SBT1-32This comment is simply the tribes’ general characterizations of information in the DLA; noresponse is required.RESPONSE TO COMMENT SBT1-33See Response to Comment SBT1-29.RESPONSE TO COMMENT SBT1-34No specific studies have been conducted, but IPC has monitored temperature, DO, andconductivity on a 24-hour basis within the bypassed reach.RESPONSE TO COMMENT SBT1-35This comment is simply the tribes’ general characterizations of information in the DLA; noresponse is required.RESPONSE TO COMMENT SBT1-36The total dissolved gas (TDG) levels of 135% of saturation do not persist 60 miles downstream.The DLA states that TDG levels in excess of the 110% of saturation standard persist downstreamto the Salmon River. Degassing of water as it flows through the 60-mile reach of the Snake Riverimmediately downstream of Hells Canyon Dam is a more significant factor in decreased TDGlevels than dilution by the Salmon River.RESPONSE TO COMMENT SBT1-37This comment is simply the tribes’ general characterizations of information in the DLA; noresponse is required.RESPONSE TO COMMENT SBT1-38IPC refers the commenter to Technical Report E.2.2-2 for a more detailed description anddiscussion of algae levels and processes in Brownlee Reservoir.RESPONSE TO COMMENT SBT1-39The comment correctly notes that mercury concentrations in fish fillets were lower than the meaninternational standard of 0.5 µg/g and the U.S. Food and Drug Administration action level of1.0 µg/g.Page 54Hells Canyon Complex