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California Regional Water Quality Control Board <br /> Central Valley Region W'. <br /> Robert Schneider,Chair <br /> Alan C.Lloyd Ph.D. Sacramento Main Office Arnold Schwarzenegger <br /> Secretary for , Internet Address: http://www.swreb.ca.gov/rwgcbS Governor <br /> 110-0 Sun Center Drive#200 Rancho Cordova,CA 95670-6114 <br /> Environmental Phone(916)464-3291 Fax(916)464-4797 <br /> Protection <br /> 27 June 2005 <br /> Mr.Robert Gray <br /> Pacific Gas and Electric Company <br /> 375 North Wiget Lane, Suite 200 <br /> Walnut Creek, California 94598 <br /> WELL DESTRUCTION REQUEST,PACIFIC GAS AND ELECTRIC COMPANY, LATHROP <br /> DEHYDRATOR STATION, SAN JOAQUIN COUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board(Regional Board)reviewed the <br /> 30 December 2004 Request for Authorization to Abandon Three Off-Site Ground>vater Monitoring Wells <br /> at PG&E's Lathrop Dehydrator Station Site (Authorization Request)that was prepared by CH2M Hill <br /> on behalf of the Pacific Gas and Electric Company(PG&E) for the Lathrop Dehydrator Station release <br /> site (site),which is west of the intersection of Willow Glenn and Undine Roads, about 6-miles northeast <br /> of Tracy in San Joaquin County. <br /> The Authorization Request contains the rationale to destroy monitoring wells MW-2,MW-3 and MW-4 <br /> at the site. The rationale includes the fact that site equipment and soil source pollution was excavated <br /> and removed from the site in April 2004. MW-2,MW-3 and MW-4 are off-site and the property owner <br /> would like the wells removed. In addition, sampling from MW-2, MW-3 and MW-4 shows that they <br /> never contained total petroleum hydrocarbons, benzene,toluene, ethylberizene or total xylenes above the <br /> water quality objective. MW-1,MW-9 and MW-10 were destroyed as part of the soil excavation work. <br /> Thus, groundwater monitoring at the site will continue as required by Monitoring and Reporting <br /> Program No. 5-01-877 for MW-5,MW-6,MW-7,MW-8,MW-11A and MW-11B. Regional Board <br /> staff concurs with your request.Thus,PG&E may proceed to atrange with San Joaquin County <br /> Environmental Health Department for the permitted destruction of monitoring wells MW-2,MW-3 and <br /> MW-4 at this site. <br /> By 8 August 2005,please submit a schedule to complete the monitoring well destruction and well <br /> installation and submit a results report. If you have any questions regarding this letter or need additional <br /> information, you may contact me at(916) 464-4682 or by email at mserra@waterboards.ca.goy. <br /> LU <br /> MARY SERRA <br /> Private Sites Cleanup Unit <br /> cc: San Joaquin County Environmental Health Department, Stockton <br /> Ms. Diane Sarmiento, CH2M Hill, Oakland <br /> California Environmental Protection Agency <br />