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SECOR \wtw secor corn <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> nchoS E C O R INCORPORATED 916-861-0400v TLL 95674 <br /> 916-861-0430 FAX <br /> July 30, 2004 <br /> Mr Harlin Knoll <br /> San Joaquin County <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE Second Quarter 2004 Groundwater Monitoring Report <br /> Chevron Service Station 9-2396 <br /> 25651 Highway 99 North <br /> Acampo, California <br /> SECOR Project No 77CH 00000 23 0012 <br /> Dear Mr Knoll <br /> SECOR International Incorporated, (SECOR) on behalf of Chevron Environmental Management <br /> Company (Chevron), has provided this report to summarize the results of the second quarter 2004 <br /> (2Q2004) groundwater monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES - SECOND QUARTER 2004 <br /> ■ Conducted quarterly groundwater monitoring and sampling, and, <br /> ■ Prepared and submitted quarterly groundwater monitoring report <br /> PROPOSED ACTIVITIES - THIRD QUARTER 2004 <br /> ■ Conduct quarterly groundwater monitoring and sampling, <br /> • Prepare and submit quarterly groundwater monitoring report <br /> DISCUSSION <br /> On April 29, 2004, Gettler-Ryan, Incorporated (G-R) performed 2Q2004 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 77 50 to 78 72 feet below ground surface (bgs) Groundwater elevation <br /> across the site increased an average of 0 82 feet from the previous sampling event Groundwater <br /> flow was calculated to the south at an approximate gradient of 0 002 feet per foot (ft/ft) A summary <br /> of total petroleum hydrocarbons as gasoline (TPHg), benzene, and methyl tertiary butyl ether (MtBE) <br /> laboratory analytical data is listed below <br /> I 1Chevron4923961Penodic Monitonng42o0412Q2004 QMR 92396 doc SECOR Intematronal Incorporated <br />