Shoshone-Bannock Tribes - Idaho Power

Idaho Power CompanyResponses to CommentsRESPONSE TO COMMENT SBT1-40The data referenced in the comment, as well as the data presented in Technical Report E.2.2-2,were collected within a single year.RESPONSE TO COMMENT SBT1-41This section has been modified in the FLA to more clearly state why comparisons to draftSnake River–Hells Canyon TMDL targets were used in discussing the data relative to statestandards. In addition, the FLA, (with the addition of Table E.2-4) and Technical Report E.2.2-2have been modified to clarify conditions relative to targets in the draft Snake River–Hells Canyon TMDL.RESPONSE TO COMMENT SBT1-42IPC’s analyses and conclusions are consistent with designated uses identified for the HCC in thedraft Snake River–Hells Canyon TMDL.RESPONSE TO COMMENT SBT1-43This comment is simply the tribes’ general characterizations of information in the DLA; noresponse is required.RESPONSE TO COMMENT SBT1-44This comment is simply the tribes’ general characterizations of information in the DLA; noresponse is required.RESPONSE TO COMMENT SBT1-45Degassing of water as it flows through the 60-mile reach of the Snake River immediatelydownstream of Hells Canyon Dam is a more significant factor in decreased TDG levels thandilution by the Salmon River.RESPONSE TO COMMENT SBT1-46IPC appreciates the Shoshone-Bannock Tribes’ support for IPC’s proposals to continuewastewater treatment activities and preferential use of the upper spillgates at Brownlee Dam.However, for the reasons stated above, IPC disagrees with the recommendation of a minimumflow of 1,350 cfs through the Oxbow Bypass.RESPONSE TO COMMENT SBT1-47The draft Snake River–Hells Canyon TMDL identified 1,450 tons of oxygen as IPC’s allocationfor restoring water quality. The draft Snake River–Hells Canyon TMDL correctly identified thatmuch of the degraded oxygen conditions throughout the HCC result from the severely degradedwater quality of inflows into Brownlee Reservoir.Hells Canyon Complex Page 55