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SECOR ] <br /> .' WWW.SeC6r COfrl <br /> S O INTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> INCORPORATED Rancho Cordova,CA 85670 <br /> I k <br /> 916-861-0400 TE <br /> 916-861-0430 FAX <br /> i <br /> October 22;2004 <br /> nL <br /> a � LL <br /> Mr. Jeffrey Wong NOV 1 9 2004 <br /> San Joaquin County f <br /> Environmental Health Division ENVIRONWIEN-f 11EALTN <br /> 304 East Weber Avenue, Third Floor PERMIT/SERVICES <br /> Stockton, California 95202 <br /> i <br /> RE: Third Quarter 2004 Groundwater Monitoring Report <br /> Chevron Service Station 9-6258 <br /> :. 2409 East Main Street i <br /> Stockton, California <br /> SECOR Project No.: 77CH.00000.23.0023 <br /> i <br /> Dear Mr. Wong: <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management <br /> Company (Chevron), has provided this report to summarize the results of the third quarter 2004 <br /> (3Q2004)groundwater monitoring event at the above-referenced site. I <br /> COMPLETED ACTIVITIES -THIRD QUARTER 2004 i <br /> 13 ■ Conducted quarterly groundwater monitoring and sampling, and; <br /> i Prepared and submitted quarterly groundwater monitoring report. <br /> PLANNED ACTIVITIES— FOURTH QUARTER 2004 <br /> =S ' <br /> ■ Conduct quarterly groundwater monitoring and sampling, and; <br /> :i <br /> ■ Prepare and submit quarterly groundwater monitoring report, and; <br /> ■ Prepare and submit a monitoring well destruction work plan. <br /> DISCUSSION <br /> On July 21, 2004, Gettler-Ryan, Incorporated (G-R) performed 3Q2004 groundwater monitoring and <br /> sampling. G-R's groundwater monitoring report is included in Attachment A. Depth to groundwater <br /> across the site ranged from 54.94 to 55.86 feet below ground surface (bgs). Groundwater elevation t <br /> r across the site decreased an average of 1.05 feet from the previous sampling event. Groundwater <br /> flow was calculated to the southwest at an approximate gradient of 0.001 to 0.003 feet per foot (ftlft). <br /> A summary of total petroleum hydrocarbons as gasoline (TPHg), benzene, and methyl tertiary butyl <br /> ether(MtBE);laboratory results are listed below. <br /> r <br /> I:LChevron1962581Periodic Monitoring12004UQ2004 QMR 96258.doc SECOR Intemational Incorporated <br /> E. . <br />