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1 I <br /> ? SECOR www.se <br /> cor•com <br /> OINTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> R INCORPORATED Rancho Cordova,CA 95670 <br /> 91 M61-0400 TEL <br /> OCT 1 2 20.04 916-861-0430 FAX <br /> 8, 2004 <br /> ENVIRONMENT HEALFH <br /> PERMIT/SERVICES <br /> Ms. Victoria McCartney <br /> San Joaquin County Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE: Third Quarter 2004 Groundwater Monitoring <br /> t d g Report i <br /> Chevron Service Station 9-1452 <br /> 1 334 East Main Street <br /> Ripon, California ` <br /> SECOR Project No,: 77CH.00000.23.0006 <br /> Dear Ms. McCartney: <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management <br /> Company (Chevron), has provided this report to summarize the third quarter 2004 (3Q2004) <br /> groundwater monitoring event at the above-referenced site. <br /> I COMPLETED ACTIVITIES–THIRD QUARTER 2004 <br /> ■ Conducted quarterly groundwater monitoring and sampling; <br /> • Prepared and submitted quarterly groundwater monitoring report, and; <br /> ■ Began weekly batch extraction. <br /> PLANNED ACTIVITIES – FOURTH QUARTER 2004 <br /> ■ Conduct quarterly groundwater monitoring and sampling; <br /> ■ Prepare and submit quarterly groundwater monitoring report; <br /> ■ Continue weekly batch extraction; <br /> ■ Prepare and submit assessment work plan; <br /> ■ Prepare and submit well search report, and; <br /> ■ Prepare and submit work plan for feasibility test. <br /> GROUNDWATER MONITORING AND SAMPLING RESULTS <br /> On August 16, 2004, Gettler-Ryan Incorporated (G-R) performed 3Q2004 groundwater monitoring <br /> and sampling. G-R's groundwater monitoring report is included in Attachment A. Depth to <br /> groundwater across the site ranged from 31.82 to 39.18 feet below ground surface (bgs)-The <br /> groundwater elevation across the site decreased an average of 2.65 feet from the previous sampling' <br /> event. The groundwater flow direction was reported to the east at an approximate gradient of 0107 to — <br /> 0.1 feet per foot (ft/ft). A summary of total petroleum hydrocarbons as gasoline (TPHg), benzene, <br /> and methyl tertiary butyl ether(MtBE) laboratory analytical data is listed below. <br /> i:lChev,=014521leriodic Monitoring4200413Q2004 QMR 91452.doc SECOR Intemationai Incorporated <br /> i . <br />