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SECOR <br /> vvvvw secor com <br /> INTERNATIONAL_ 3017 Kilgore Road Sete 100 <br /> S E C ® R INCORPORATED Rancho Cordova CA 95670 <br /> 916-861-0400 TEL <br /> . 918-861-0430 FAx <br /> April 29, 2005 <br /> Mr Harlin Knoll "W=It-Mm' ED <br /> San Joaquin County Environmental Health Department MAY 0 4 2005 <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 AONMNT HEALTH <br /> RE First Quarter 2005 Groundwater Monitoring Report <br /> PERMT/SERVICES <br /> Chevron Station 9-3232 <br /> 8660 lower Sacramento Road <br /> Stockton, California <br /> SECOR Project No 77CH 93232 01 <br /> Dear Mr Knoll <br /> SECOR International Incorporated (SECOR), on behalf of ChevronTexaco Environmental <br /> Management Company (EMC), has provided this report to summarize the first quarter 2005 <br /> (1 Q2005)groundwater monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES - FIRST QUARTER 2005 <br /> ■ Conducted quarterly groundwater monitoring and sampling, and, <br /> ■ Prepared and submitted quarterly groundwater monitoring report <br /> PLANNED ACTIVITIES —SECOND QUARTER 2005 <br /> ■ Conduct quarterly groundwater monitoring and sampling, and, <br /> fl <br /> ■ Prepare and submit quarterly groundwater monitoring report <br /> DISCUSSION <br /> a � <br /> On January 6, 2005, Gettler-Ryan Incorporated (G-R) performed 1Q2005 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 38 99 to 46 17 feet below ground surface (bgs) <br /> Groundwater elevation across the site Increased an average of 4 46 feet from the previous sampling <br /> event Groundwater flow varies at an approximate gradient of 0 001 to 0 004 Ten wells were t <br /> sampled during this event A summary of total petroleum hydrocarbons as gasoline (TPHg), <br /> benzene, methyl tertiary butyl ether (MtBE), and tertiary butyl alcohol (TSA) laboratory analytical <br /> data is presented below <br /> N iFileslProjectslChevronlReta+A#9-32321Penodic Monrtonng120050Q05MR 93232 doc SECOR lntemahonal Incorporated <br />