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SECaR ',vti : s<'L 0!crim <br /> ;N?E RNA-IQNA'L 3017 Kilgore Road.Suite 100 <br /> C I;�CD ?O.'7 3"^O Rancho Cordova,GA 95670 <br /> 91661-0400 TEL <br /> 91861-0430 FAX <br /> April 30, 200 y 10— <br /> Ms. Victoria McCartney <br /> San Joaquin County Environmental Health Division PR z00 <br /> 304 East Weber Avenue, Third Floor ENVIRONMENT HEALTH <br /> Stockton, California 95202 PERMIT/SERVICES <br /> RE: First Quarter 2004 Groundwater Monitoring Report <br /> Former Chevron Service Station 9-0557 <br /> 139 South Center Street <br /> Stockton, California <br /> SECOR Project No.: 77CH.00000.23.0003 <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 first quarter 2004 (1Q2004) <br /> groundwater monitoring event at the above-referenced site. <br /> COMPLETED ACTIVITIES - FIRST QUARTER 2004 <br /> ■ Conducted quarterly groundwater monitoring and sampling; <br /> = Prepared and submitted quarterly groundwater monitoring report, and; .' <br /> • Completed CPT borings and installed monitoring wells. ' <br /> PLANNED ACTIVITIES - SECOND QUARTER 2004 <br /> ■ Conduct quarterly groundwater monitoring and sampling; <br /> ■ Prepare and submit quarterly groundwater monitoring report, and; <br /> ■ Prepare and submit monitoring well installation report. <br /> DISCUSSION <br /> On January 22, 2004, Gettler-Ryan Incorporated (G-R) performed 1Q2004 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 24.81 to 29.67 feet below ground surface (bgs). <br /> Groundwater elevation across the site decreased an average of 0.56 feet from the previous sampling <br /> event. Groundwater flow was reported to the south at an approximate gradient of 0.02 feet 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 /> • <br /> l:lChevron190557tPeriodic Monitodng120041902004 QMR 90557.doc SECOR International incorporated <br />