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SECOR www.secor.com <br /> INTERNATIONAL <br /> S E C O R INCORPORATED Ran Kilgore Road,Suite 100 <br /> Rancho Cordova,CA 95670 <br /> 916-861-0400 rEL <br /> 916-861-0430 Fax <br /> September 27, 2005 20CS SEP 29 PN 1: 08 <br /> Ms. Victoria McCartney E lA L'I Fi.U-1 e t,k T 7-1L NT <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE: June 2005 Batch Groundwater Extraction Report <br /> Chevron Service Station 9-1452 <br /> 334 East Main Street <br /> Ripon, California <br /> S�COR 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 June 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 ,lune 26, 2003. This work plan was approved by the San Joaquin <br /> County Environmental Health Department (SJCEHD) as indicated in their letter dated October 16, <br /> 2003 (Attachment 1). <br /> On June 7, 14, 21, and 28, 2005, Integrated Wastestream Management (IWM), under the <br /> supervision of SECOR, extracted approximately 12,200 gallons of groundwater from wells 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 0.03 pound of <br /> dissolved methyl tertiary butyl ether (MtBE) was removed from the groundwater. To date, <br /> approximately 3.81 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 are 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 /> Bryan Rorie Brian Carey <br /> Staff Scientist Associate Geologist <br /> I:IChevronM4521REP0RTSIBatch Extraction120051June 2005 Batch Extraction.doc <br />