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SECOR vwvw.secor.com <br /> INTERNATIONAL 3017 Kitgore Road,Suite 10D <br /> S ECOR INCORPORATED Rancho Cordova,CA 95670 <br /> 916-861-0400 TEL <br /> 916-861-0430 FAX <br /> May 12, 2006 <br /> Ms. Lori Duncan RECEWD <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor Mpy 15 2006 <br /> Stockton, California 95202 ENVIRONMENt NEWN <br /> RE: First Quarter 2006 Quarterly Progress Report <br /> Commingled Plume Site #35 01-A `L <br /> Chevron Service Station # 9-4275 (tJ� C� 5 <br /> 2905 West Benjamin Holt Drive C " <br /> {l� <br /> �1" <br /> Stockton, California <br /> ARCO Service Station # 2133 C� <br /> 2908 West Benjamin Holt Drive <br /> Stockton, California <br /> SECOR Project No.: 77BP.52133.05.0003 <br /> Dear Ms. Duncan: <br /> SECOR International Incorporated (SECOR) is providing this report to summarize the first <br /> quarter 2006 (1 Q06) groundwater monitoring event and the 1 Q06 remedial activities at the <br /> above referenced commingled plume site (Figures 1 and 2). <br /> COMPLETED ACTIVITIES — First Quarter 2006 <br /> • Performed coordinated quarterly groundwater monitoring and sampling. <br /> • Prepared and submitted quarterly groundwater monitoring report. <br /> • Operated and maintained air sparge (AS) systems (ARCO). <br /> • Installed three monitoring wells (MW-1 R, MW-2R and MW-3R) (Chevron) and <br /> advanced four soil borings (AS-8 through AS-11) (ARCO). <br /> PLANNED ACTIVITIES — Second Quarter 2006 <br /> • Perform coordinated quarterly groundwater monitoring and sampling. <br /> • Prepare and submit quarterly groundwater monitoring report. <br /> • Operate and maintain AS system (ARCO). <br /> • Install four monitoring wells (MW-5R, MW-7R, MW-9R and MW-10) (Chevron). <br /> GROUNDWATER MONITORING DISCUSSION <br /> On March 20, 21 and 22, 2006, SECOR conducted 1Q06 groundwater monitoring and <br /> sampling for Chevron service station 9-4275 and ARCO service station 2133. Five <br /> 1AChevron1942751REP0RTSIQ M R1200611Q06.doc <br />