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SECOR vwwv secor com <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> E C ® R INCORPORATED Rancho Cordova CA 95670 <br /> 916-861-0400 TEL <br /> 916-861-0430 FAX <br /> April 29, 2005 RECIEWED <br /> Mr Harlin Knoll <br /> MAY 0 4 2005 <br /> San Joaquin County Environmental Health Department E"RONMENT HEALTH <br /> 304 East Weber Avenue, Third Floor PERWISEN CIES <br /> Stockton, California 95202 <br /> RE First Quarter 2005 Groundwater Monitoring Report <br /> Chevron Station 9-8264 <br /> 3775 Tracy Boulevard <br /> Tracy, California <br /> SECOR Project No 77CH 98264 00 <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 l <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 24, 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 9 07 to 10 67 feet below ground surface (bgs) <br /> Groundwater elevation across the site increased an average of 0 11 feet from the previous sampling <br /> event Groundwater flow was calculated to the southeast at an approximate gradient from 0 002 to # <br /> 0 004 A summary of total petroleum hydrocarbons as diesel (TPHd), total petroleum hydrocarbons <br /> as gasoline (TPHg), benzene, and methyl tertiary butyl ether (MtBE) laboratory analytical data Is <br /> presented below <br /> • <br /> N 4FrleslProfectslChevronlRetadl#9-62641Penodre Monftonngl200511 Q2005 QMR 98264 doc SECOR Intematronat Incorporated <br />