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Phil Gruenberg, Executive Officer

Proposed IID/SDCWA Transfer. CRWQCB-R7 Staff Concerns 5/13/2002. Phil Gruenberg, Executive Officer California Regional Water Quality Control Board - Colorado River Basin. Salton Sea Beneficial Uses*. Warm water ecosystem Vegetation, fish, wildlife, invertebrates Wildlife habitat

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Phil Gruenberg, Executive Officer

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  1. Proposed IID/SDCWA Transfer CRWQCB-R7 Staff Concerns 5/13/2002 Phil Gruenberg, Executive Officer California Regional Water Quality Control Board - Colorado River Basin

  2. Salton Sea Beneficial Uses* • Warm water ecosystem • Vegetation, fish, wildlife, invertebrates • Wildlife habitat • Water contact recreation • Non-contact water recreation • Preservation of rare, threatened, endangered species * Water Quality Control Plan for the Colorado River Basin, CRWQCB-R7, 1994. (Salton Sea was designated as a sump for agricultural drainage in 1924)

  3. New and Alamo Rivers, IV Drains BUs* Warm water ecosystem Wildlife habitat Rare, threatened, endangered species Recreational activities (I & II) Freshwater Replenishment * Water Quality Control Plan for the Colorado River Basin, CRWQCB-R7, 1994. (New and Alamo Rivers also include industrial supply and hydropower generation as potential uses, respectively)

  4. Potential WQ Impacts of Transfer • Salton Sea salinity

  5. Salinity Impacts • Aquatic life • Salton Sea Restoration Project • Impacts contingent on selection of specific water conservation measures

  6. Conservation Measures and BMPs

  7. Potential WQ Impacts of Transfer • Selenium

  8. Selenium Impacts • Fish consumption advisory • Wildlife threat • Exceedance of Water Quality Standards • Impact contingent on water conservation measures

  9. 0 0 5 5 10 10 15 15 20 20 25 25 30 30 Selenium (ppb) Salton Sea (midpoint)* ????? WQO New River (outlet)** Alamo River (outlet)** IV Drains* Current levels Potential increase * CRWQCB-R7 Trend Monitoring Data ** CRWQCB-R7 Exhibit No. 4

  10. Ag Return Flows

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