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SECOR wwwsecorcom <br /> INTERNATIONAL <br /> S E C O R INCORPORATED 3017 Kilgore Road,Suite 100 <br /> Rancho Cordova,CA 95670 <br /> 916-861-0400 TEL <br /> 916-861-0430 FAX <br /> July 19, 2005 <br /> Ms, Victoria McCartney <br /> San Joaquin County Environmental Health Department JUL 2 12005 <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 ENVIRONMENT HEALTH r <br /> PERMIT/SERVICES <br /> RE: May 2005 Batch Groundwater Extraction Report S <br /> Chevron Service Station 9-1452 <br /> y,^ <br /> 334 East Main Street vt 4 <br /> Ripon, California <br /> SECOR Project No.: 77CH.91452.05.0370 <br /> Dear Ms. McCartney: <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management <br /> Company (Chevron), presents data for the May 2005 batch groundwater extraction event at the site <br /> referenced above (Figure 1). This work was performed in accordance with SECOR's Work Plan for <br /> Interim Remedial Measures, dated June 26, 2003. This work plan was approved by the San Joaquin <br /> County Environmental Health Division (County) as indicated in their letter dated October 16, 2003 <br /> (Attachment 1). <br /> On May 3, 10, 17, 24, and 31, 2005 Integrated Wastestream Management (IWM), under the <br /> supervision of SECOR, extracted approximately 15,100 gallons of groundwater from well MW-6S <br /> and well MW-8 (Figure 2) using a submersible pump at a pumping rate of approximately 5 gallons <br /> per minute (gpm). Based on the data collected during this event, approximately 0.09 pound of <br /> dissolved methyl tertiary butyl ether (MtBE) was removed from the groundwater. To date, <br /> approximately 3.78 cumulative pounds of dissolved MtBE has been removed from the groundwater. <br /> Extracted groundwater analytical data and MtBE mass removal estimates are presented in Tables 1 <br /> and 2, respectively. Certified analytical reports and chain-of-custody documentation is included in <br /> Attachment 2. Field data sheets for the batch extraction events are included in Attachment 3. <br /> If you have any questions or require additional information, please feel free to contact Brian Carey of <br /> SECOR at(916)861-0400, extension 241 or Darin Rouse of Chevron at(925)842-9655. <br /> Sincerely, <br /> SECOR International Incorporated <br /> s <br /> Bryan Rorie Brian Carey <br /> Staff Scientist Associate Geologist <br /> lAChevron1914521REP0RTS18atch Extraction120051May 2005 Batch Extraction.doc <br />