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,". . (j1l2~9~ . . WATER QUALITY Colorado River Basin Salinity Control Program Hexavalent Chromium & PG&E Topock Gas Compressor Station At the March Board meeting, the Board was informed about the PG&E hexavalent chromium issue and potential contamination of the Colorado River. During the meeting, MWD provided a presentation on the PG&E site, as well as, presented data on the level of chromium concentrations in the observation wells near the River. As you recall, the California Department of Toxic Substance Control (DTSC) is the lead agency in charge of the remediation efforts, DTSC has established a Consultative Work Group (CWG) to facilitate participation of the stakeholders in the corrective action process, and through such participation, integrate applicable federal and state regulatory authorities and requirements, and assist DTSC in making appropriate decisions toward the effective and expedited remediation of the hazards and waste release, A copy of the CWG charter is in the Board folder. Representatives of the Board staff attended the CWG meeting on March 18, at the DTSC office in Cypress, The meeting focused on the construction of a passive physical barrier and remediation methods, MWD provided a presentation on different methods for developing a physical barrier, PG&E provided presentations on physical harriers and different remediation methods (e.g., in-situ treatment, groundwater extraction and treatment, permeable reactive barrier, and phylo-remediation). Also, PG&E provided a presentation on the status of interim Measures I and 2, PG&E will send the criteria for remediation to the Technical Committee for review and discussions, The next CWG meeting is scheduled for April 15, 2004, at Topock site, A Special News clip was released by MWD regarding the efforts by PG&E to keep the Chromium VI from contaminating the Colorado River, Also, the Arizona Department of Environmental Quality and the Yuma County Board of Supervisors have raised concerns about the possible risk to the quality of the Colorado River water, Both agencies have written letters to the Regional Administrator of Region 9 of the U,S, Environmental Protection Agency (EPA) to urge EPA to review the efforts of PG&E to address the issues and control the contamination in order to avoid any potential risk to the health and safety of residents along the Colorado River. Copies of MWD's News Clips and the letters to EPA from the Arizona parties are included in the Board's handout materials, , ~_~~7:?_~ - rL.1!I . SJerald R ' rman Executive Director - 7 ,