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URS <br /> October 3, 2002 OCT 0 9 2002 <br /> Ms. Lori Duncan ENVIRUNIVIL- 11 HEALTH <br /> Senior Environmental Health Specialist PERMIT/SERVICES <br /> San Joaquin County Environmental Health Departmer t <br /> 304 East Weber Avenue <br /> Third Floor <br /> Stockton, CA 95202-2708 <br /> Re: Former ARCO Service Station 4493 <br /> 205 North Center Street <br /> Stockton, California 95202 <br /> Dear Ms. Duncan: <br /> URS Corporation Americas, (URS)on behalf of Atlantic Richfield Company(ARCO), has prepared this <br /> letter to provide you with an update on the status of the workplan addendum requested by your office <br /> for the former ARCO service station located at 205 North Center Street in Stockton, California. On <br /> July 5, 2002, URS submitted a workplan to install two shallow,groundwater monitoring wells to further <br /> characterize the groundwater downgradient from the ormer service station. In your letter dated July 5, <br /> 2002, it was requested that a workplan addendum be prepared to install two deep monitoring wells in <br /> addition to the two shallow wells. These deep monitoring wells are to complement the deep <br /> groundwater monitoring wells installed by SECOR International Incorporated in May 2002, which <br /> reported the presence of petroleum hydrocarbons iin the samples collected during the first round of <br /> sampling on June 12, 2002. URS is currently waiting for the receipt of the analytical data from the third <br /> quarter 2002 sampling event conducted on September 20, 2002. These data will allow URS and ARCO <br /> to evaluate two quarters of groundwater data from the newly installed deep monitoring wells prior to <br /> proposing construction specifications for any new deep wells. <br /> URS will receive the analytical data from the third ound of sampling next week, and anticipates the <br /> workplan addendum to be complete by October 18, 2 02. URS has tentatively scheduled the drilling of <br /> the new shallow and deep monitoring wells for Monday, November 4, 2002. <br /> If you have any questions or require additional information,please call me at(916)679-2299. <br /> Sincerely, <br /> URS Corporation Americas <br /> Vernon P.Elarth, R.G. <br /> Project Manager <br /> VPE/ac <br /> cc: Mr. Paul Supple,ARCO <br /> Mr. Marty Hartzell, RWQCB <br /> Mr. George Montross, City of Stockton <br /> URS Corporation <br /> Crown Corporate Center <br /> 2870 Gateway Oaks Drive, Suite 300 <br /> Sacramento, CA 95833 <br /> Tei:916.679.2000 <br /> Fax:916.679.2900 K:U5 BP ARCO%044931Regulatory Correspondence\Ll00302.doc <br />