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SECOR www.secor.com <br /> INTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> S E C 0 R INCORPORATED Rancho Cordova,CA 95670 <br /> 916-061-0400 TEL <br /> 916-061-0430 FAX <br /> October 24, 2005 * L 41 SID f ` f�-'� ✓ <br /> Ms. Victoria McCartney Qut I �r'_�/red <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third FloorF r <br /> Stockton, California 95202 <br /> RE: Third Quarter 2005 Groundwater Monitoring Report <br /> Chevron Service Station 9-1452 ',L�' x '� <br /> 334 East Main Street 0 <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 (EMC), has provided this report to summarize the results of the third quarter 2005 <br /> (3Q2005) groundwater monitoring event at the above-referenced site. <br /> COMPLETED ACTIVITIES—THIRD QUARTER 2005 <br /> Conducted quarterly groundwater monitoring and sampling; <br /> ■ Prepared and submitted quarterly groundwater monitoring report, and; <br /> ■ Prepared and submitted assessment work plan addendum. <br /> PLANNED ACTIVITIES— FOURTH QUARTER 2005 <br /> ■ Conduct quarterly groundwater monitoring and sampling, and; <br /> ■ Prepare and submit quarterly groundwater monitoring report. <br /> GROUNDWATER MONITORING AND SAMPLING RESULTS <br /> On August 30, 2005, Gettler-Ryan Incorporated (G-R) performed 3Q2005 groundwater monitoring <br /> and sampling. G-R's groundwater monitoring report is included in Attachment 1. Depth to <br /> groundwater across the site ranged from 30.80 to 34.20 feet below ground surface (bgs). The <br /> groundwater elevation across the site decreased an average of 1.42 feet from the previous sampling <br /> event. The groundwater flow direction was northwest at an approximate gradient of 0.001 to 0.007 <br /> ft/ft. A summary of total petroleum hydrocarbons as gasoline (TPHg), benzene, and methyl tertiary <br /> butyl ether (MtBE) laboratory analytical data is listed below. TPHg and MtBE concentrations have <br /> decreased significantly in wells MW-6S and MW-8 since May 2004 and August 2004, respectively. <br /> Hydrocarbons concentrations have decreased with time in MW-4 (MtBE), MW-5S (MtBE and TAME), <br /> and MW-6S (MtBE and TAME), and MW-8 (MtBE, TBA, and TAME). <br /> I:4Chev=1914521Periodic thonitoring1200513=05 QMR 91452.doc SECOR International Incorporated <br />