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<br />. <br /> <br />. <br /> <br />WATER QUALITY <br /> <br />Regional Water Quality Control Board- Colorado River Basin Region <br /> <br />Pacific Gas & Electric Topock Gas Compressor Station <br /> <br />Included in the Board folder, as an informational item, is a copy ofa Draft Cleanup and Abatement <br />Order, requiring PG&E to take necessary action to cleanup a hexavalent chromium groundwater plume <br />migrating towards the Colorado River from PG&E's Topock Gas Compressor station located 15 miles <br />southeast of Needles, California. <br /> <br />Between 1951 and 1985, PG&E used an anti-scaling chemical agent containing hexavalent <br />chromium in its cooling towers. Until the mid-sixties, cooling tower blow down was discharged into <br />a nearby ephemeral stream bed that discharged into the Colorado River. In late 1970, cooling tower <br />blow down was discharged to on-site earthen evaporation basins. Subsequently, triple lined basins were <br />constructed to accept the cooling tower blow down. Hexavalent chromium has been detected in various <br />monitoring wells around the compressor site and, on March 19,2003, was detected in a new well <br />located within 300 feet of the Colorado River. <br /> <br />PG&E has been ordered to: <br /> <br />. Within 60 days of issuance of the Order, to submit a feasibility study that describes the <br />available alternatives for remediation and identify the preferred alternative. <br />. 30 days after approval of the feasibility study, PG&E shall submit a remedial action work plan <br />for the preferred altemative. <br />. Within 45 days, PG&E shall initiate site cleanup as detailed in the approved workplan. <br /> <br /> <br />10 <br />