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SECOR <br /> fN TEl7NF T,?0Fs!A'_ 3017 Kilgore Road,Suite 100 <br /> �'CORnOi2/.-_D Rancho Cordova,CA 95670 <br /> 916-861-0400 TEL <br /> 916-861-0430 FAx <br /> January 23, 2003 <br /> Ms. Victoria McCartneyr� <br /> San Joaquin County Environmental Health Division [J J � <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 JAN 2 7 2004 <br /> RE: Fourth Quarter 2003 Groundwater Monitoring Report ENVIRONMENT HEALTH <br /> Former Chevron Service Station 9-0557 PERMITISER VICES <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 fourth quarter 2003 (402003) <br /> groundwater monitoring event at the above-referenced site. <br /> COMPLETED ACTIVITIES - FOURTH QUARTER 2003 <br /> • Conducted quarterly groundwater monitoring and sampling; <br /> • Prepared and submitted quarterly groundwater monitoring report, and; <br /> ■ Submitted addendum to work plan for monitoring well installation. <br /> PLANNED ACTIVITIES - FIRST QUARTER 2004 <br /> • Conduct quarterly groundwater monitoring and sampling; <br /> ■ Prepare and submit quarterly groundwater monitoring report, and; <br /> ■ Install monitoring wells. <br /> DISCUSSION <br /> On October 17, 2003, Gettler-Ryan Incorporated (G-R) performed 4Q2003 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 25.30 to 26.67 feet below ground surface (bgs). <br /> Groundwater elevation across the site decreased an average of 1.12 feet from the previous sampling <br /> event. Groundwater flow was reported to the east/southeast at an approximate gradient of 0.001 to <br /> 0.004 foot 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:lChevron1905571Periodlc Monitoring120031402003 QMR 90557.doc SECOR Intemational Incorporated <br />