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SECOR www.secorcom <br /> INTERNATIONAL 3017 Kilgore Road,Suite 400 <br /> S E C O R INCORPORATED Rancho Cordova,CA 95670 <br /> 946-861-0400 TEL <br /> 916-861-0430 FAx <br /> January 30, 2005 <br /> AN 2 s zoos <br /> Ms. Victoria McCartney ENVIRONMENT HEALTH <br /> San Joaquin County Environmental Health Department PER AI r/SERVICES <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE: Fourth Quarter 2005 Groundwater Monitoring Report ,yy <br /> Chevron Service Station 9-1452 <br /> 334 East Main Street L G aG r�'M <br /> Ripon, California r .301 <br /> SECOR Project No.: 77CH.91452.07.0370 61-11 <br /> V <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 fourth quarter 2005 <br /> (4Q2005) groundwater monitoring event at the above-referenced site. <br /> COMPLETED ACTIVITIES — FOURTH QUARTER 2005 <br /> ■ Conducted quarterly groundwater monitoring and sampling, and; <br /> ■ Prepared and submitted quarterly groundwater monitoring report. <br /> PLANNED ACTIVITIES— FIRST QUARTER 2006 <br /> • Conduct quarterly groundwater monitoring and sampling, and; <br /> • Prepare and submit quarterly groundwater monitoring report. <br /> GROUNDWATER MONITORING AND SAMPLING RESULTS <br /> On November 28, 2005, Gettler-Ryan Incorporated (G-R) performed 4Q2005 groundwater <br /> monitoring and sampling. G-R's groundwater monitoring report is included in Attachment 1. Depth to <br /> groundwater across the site ranged from 30.65 to 34.05 feet below ground surface (bgs). The <br /> groundwater elevation across the site decreased an average of 0.18 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 MW4 (MtBE), MW-5S (MtBE and TAME), <br /> and MW-6S (MtBE and TAME), and MW-8 (MtBE, TBA, and TAME). <br /> 1,,lChevronO14521Periodic MonitoringW0514Q2005 QMR 91452.doc SECOR intemational Incorporated <br />