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California igional Water Quality C7& of Board - <br /> Central Valley Region <br /> Katherine Hart, Chair <br /> Linda S.Adams E l� Arnold <br /> Secretary for 11020 Sun Center Drive#200, Rancho Cordova, California 9567 fry— ILChhyvarzenegger <br /> Phone(916)464-3291 •FAX(916)464-4645 t'=�1J Govemor <br /> Environmental http://www.waterboards.ca.gov/centralvalley <br /> Protection MAR 1 8 2010 <br /> 17 March 2010 ENVIRONMENT HEALTH <br /> Denis Brown Sergio Morescalchi StephaniXWkQ9RVICE3 <br /> Shell Oil Products US Atlantic Richfield Company Chevron Environmental Management <br /> 20945 S. Wilmington Ave. P.O. Box 1257 6111 Bollinger Cyn. Rd., Rm. 3652 <br /> Carson, CA 90810 San Ramon, CA 94583 San Ramon, CA 94583 <br /> LEAD AGENCY STATUS AND DIRECTIVES FOR UNAUTHORIZED RELEASE CASES <br /> NOS. 390268 13906571390876, AT 440(TEXACO- SHELL)/441 (ARCO)/508(CHEVRON) <br /> W. CHARTER WAY, STOCKTON, SAN JOAQUIN COUNTY <br /> In letters dated 4 March 2010, the San Joaquin County Environmental Health Department referred the <br /> lead agency for the above three cases to the Regional Water Quality Control Board (Regional Water <br /> Board). Upon review of the technical data contained in our files and on the State's GeoTracker <br /> database system, as well as all recent correspondence, significant impacts remain in soil and <br /> groundwater beneath your sites, and continue to be elevated well in excess of both human health and <br /> safety and water quality criteria established to ensure protection of same. As such, additional remedial <br /> efforts clearly need to be conducted. In addition, a review of your commingled plume application is <br /> currently being conducted by State Water Resources Control Board (State Water Board) Underground <br /> Storage Tanks Cleanup Fund staff. In that the State Water Board's commingled plume application <br /> process may take several months to finalize and approve, and the identified contamination that you are <br /> responsible for continues to significantly impact waters of the state and threaten human health and <br /> safety, corrective action work at your site is not to stop. The ARCO remediation system will continue <br /> operations. <br /> Therefore, you are to: <br /> 1. Continue monitoring all wells semi-annually per State Water Board Resolution No. 2009-0042, until <br /> directed otherwise by staff. You are to monitor during the second and fourth quarter of each year, <br /> with reports due the 30th day of the month following the reporting quarter. <br /> 2. Under the commingled plume regulations, a single point of contact and case management is <br /> established. If you have established said contact(s), you are to provide, via email, with said <br /> commingled plume spokespersons/contacts for both correspondence and environmental consultant <br /> interactions. Please supply the requested information by 1 May 2010 <br /> Your next monitoring report is due 30 July 2010. Pending staff receipt of the monitoring report (hard <br /> copy and GeoTracker), the data will be reviewed for additional direction and directives. I recommend <br /> that you and your consultant meet with Regional Water Board staff as soon as possible to discuss the <br /> most appropriate direction to both minimize your costs and to proceed with timely remediation of the <br /> problem. <br /> California Environmental Protection Agency <br /> 01 Recycled Paper <br />