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SECOR <br /> I NTERNATI ONAI <br /> S C Q R INCORPORATE'? 3017 Kilgore Road,Suite 100 <br /> Rancho Cordova.CA 95670 <br /> 91 .861-0400 rpt <br /> L J U V n P, <br /> 1 3 <br /> 916-861-0430 nx <br /> October 27, 2003 <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 2003 Groundwater Monitoring Report <br /> Former Chevron Service Station 9-0557 <br /> 139 South Center Street <br /> Stockton, California <br /> SECOR Project No.: 77CH.00000.09.0002 <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 2003 (302003) <br /> groundwater monitoring event at the above-referenced site. <br /> COMPLETED ACTIVITIES- THIRD QUARTER 2003 <br /> • • Conducted quarterly groundwater monitoring and sampling; <br /> • Prepared and submitted quarterly groundwater monitoring report, and; <br /> ■ Submitted feasibility test summary report. <br /> PLANNED ACTIVITIES - FOURTH QUARTER 2003 <br /> ■ Conduct quarterly groundwater monitoring and sampling; <br /> • Prepare and submit quarterly groundwater monitoring report, and; <br /> • Install monitoring wells. <br /> DISCUSSION <br /> On July 8, 2003, Gettler-Ryan Incorporated (G-R) performed 302003 groundwater monitoring and <br /> sampling. G-R's groundwater monitoring report is included as Attachment A. Depth to groundwater <br /> across the site ranged from 24.12 to 24.63 feet below ground surface (bgs)- Groundwater elevation <br /> across the site decreased an average of 0.4 feet from the previous sampling event. Groundwater <br /> flow was reported to the east/southeast at an approximate gradient of 0.001 to 0.01 foot per feet <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. <br /> l:lChevroM905571Periodic Monitoring120031302003 OMR 90557 Rev A.doc SECOR International Incorporated <br />