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SECOR wwwsecorcom <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> S E C ® R INCORPORATED Rancho Cordova CA 95670 <br /> 916-8$1-0400 TEL <br /> 916-881-0430 FAX <br /> April 29, 2005 RECENED <br /> Mr Harlin Knoll MAY 0 3 2005 <br /> San Joaquin County Environmental Health Department ENV{ROFII�ft�T HEALTH <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 PERMIT/SERVICES <br /> RE First Quarter 2005 Groundwater Monitoring Report <br /> Former Chevron Station 9-8632 <br /> 575 W Grant Line Road <br /> Tracy, California <br /> SECOR Project No 77CH 98632 02 <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 results of the first quarter <br /> 2005 (1Q2005) 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 /> • Prepare and submit quarterly groundwater monitoring report <br /> DISCUSSION <br /> On January 31, 2005, Gettler-Ryan Incorporated (G-R) performed 102005 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 5 25 to 7 61 feet below ground surface (bgs) Groundwater <br /> elevation across the site Increased an average of 0 43 feet from the previous sampling event <br /> Groundwater flow was calculated to the northwest at an approximate gradient of 0 007 to 0 009 ft/ft <br /> A summary of total petroleum hydrocarbons as diesel (TPHd), total petroleum hydrocarbons as <br /> gasoline (TPHg), benzene, methyl tertiary butyl ether (MtBE) laboratory analytical data is presented <br /> below <br /> N IFileslProfectslChevronlRetaiA#9-8632(Tracy)IPenodic Monitonng120051102005 QMR 98632 docSECOR International Incorporated <br />