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SECOR www secor com <br /> INTERNATIONAL 3017 Kilgore Road,Swle 100 <br /> COINCORPORATED Rancho Cordova CA 95670 <br /> 916-861 0400 TEL <br /> 916-8610430 FAX <br /> D <br /> January 23, 2004 ECE8 <br /> YED <br /> JA N 2 7 2004 <br /> Ms victoria McCartney ENVIRONMENT HEALTH <br /> San Joaquin County Environmental Health Division PERMIT/SERVICES <br /> 304 East Weber Avenue, Third Floor <br /> o <br /> Stockton, California 95202 <br /> RE Fourth Quarter 2003 Groundwater Monitoring Report <br /> Chevron Service Station 9-1452 <br /> 334 East Main Street dna 1 �O � WtA <br /> Ripon, California <br /> SECOR Project No 77CH 00000 09 0004 C� <br /> I <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 (4Q2003) <br /> groundwater monitoring event at the above-referenced site In addition, this report presents a <br /> summary of batch extraction results <br /> COMPLETED ACTIVITIES --FOURTH QUARTER 2003 <br /> . Conducted quarterly groundwater monitoring and sampling and, <br /> ■ Prepared and submitted quarterly groundwater monitoring report, ra` <br /> ■ Conducted November and December batch extraction, and, <br /> ■ Prepared and submitted November and December batch extraction reports <br /> PLANNED ACTIVITIES — FIRST QUARTER 2004 <br /> 5I <br /> ■ Conduct quarterly groundwater monitoring and sampling, ' <br /> r, <br /> ■ Prepare and submit quarterly groundwater monitoring report, 43� <br /> ■ Perform January, February, and March batch extraction, and, ; 4 <br /> ■ Prepare and submit January, February, and March batch extraction reports :$ 1 <br /> GROUNDWATER MONITORING AND SAMPLING RESULTS <br /> t <br /> On November 11, 2003, Gettler-Ryan Incorporated (G-R) performed 4Q2003 groundwater <br /> monitoring and sampling G-R's groundwater monitoring report is included in Attachment A Depth to <br /> groundwater across the site ranged from 30 41 to 33 90 feet below ground surface (bgs) The <br /> groundwater elevation across the site decreased an average of 1 58 feet from the previous sampling M <br /> event The groundwater flow direction varied at an approximate gradient of 0 01 to 0 02 foot per foot , <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 /> i <br /> t 4Chevron191452IPenodic Monrtonngl2003WQ2003 OMR 91452 doc SECOR Intemakonat Incorporated <br />