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SECOR www secor com <br /> INTERNATIONAL 3475 West Shaw Ave Suite 104 <br /> S E C ® R INCORPORATED Fresno CA 93711 <br /> 559-271-2650 TEL <br /> 559-271-5108 FAX <br /> s <br /> January 18, 2006 <br /> Mr Harlin Knoll JA V <br /> San Joaquin County Environmental Health Department ENVIRO 44 9 2006 <br /> 304 East Weber Avenue, Third Floor r RM/j Fwfj"A <br /> Stockton, California 95202 A3E�o A 11 <br /> RE Fourth Quarter 2005 Groundwater Monitoring Report <br /> Chevron Service 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 Chevron Environmental <br /> Management Company (EMC), has provided this report to summarize the results of the <br /> fourth quarter 2005 (4Q2005) groundwater monitoring event at the above-referenced site <br /> . The site is currently a Chevron service station located at 3775 Tracy Boulevard, Tracy, <br /> California <br /> COMPLETED ACTIVITIES — FOURTH QUARTER 2005 <br /> ■ Conducted quarterly groundwater monitoring and sampling, and, <br /> ■ Prepared and submitted quarterly groundwater monitoring report <br /> PLANNED ACTIVITIES — FIRST QUARTER 2006 <br /> ■ Conduct quarterly groundwater monitoring and sampling, <br /> ■ Prepare and submit quarterly groundwater monitoring report, and, <br /> ■ Meet with regulatory personnel to discuss future site activities <br /> DISCUSSION <br /> On October 26, 2005, Gettler-Ryan Incorporated (G-R) performed 4Q2005 groundwater <br /> monitoring and sampling (Attachment A) Groundwater elevation across the site ranged <br /> from 7 78 to 8 12 feet above mean sea level (msl) and increased an average of one foot <br /> from the previous sampling event The potential for groundwater flow was calculated to the <br /> northeast at an approximate gradient of 0 002 to 0 004 feet A summary of total petroleum <br /> hydrocarbons as diesel (TPHd), total petroleum hydrocarbons as gasoline (TPHg), <br /> benzene, and methyl tertiary butyl ether (MtBE) laboratory analytical data are presented <br /> below <br /> N IFileslProjectslChevronlRetarll#9-8264IPerrodre M0rntonn91200514QMR05WQ2005 QMR doc <br />