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r <br /> SECOR www secor com <br /> INTERNATIONAL 3475 West ShawAve Suite 904 <br /> S E C ® R INCORPORATED Fresno CA 93711 <br /> 559-271-2650 TEL <br /> 559-271-5108 FAX <br /> July 18, 2005 <br /> Mr Harlin Knoll JUL 1 9 2005 <br /> San Joaquin County Environmental Health Department ENVIRONMENT HEALTH <br /> 304 East Weber Avenue, Third Floor PERMIT/SERVICES <br /> Stockton, California 95202 <br /> RE Second 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 Chevron Environmental <br /> Management Company (EMC), has provided this report to summarize the results of the <br /> second quarter 2005 (2Q2005) groundwater monitoring event at the above-referenced site <br /> . COMPLETED ACTIVITIES —SECOND QUARTER 2005 <br /> Conducted quarterly groundwater monitoring and sampling, and, <br /> 13 Prepared and submitted quarterly groundwater monitoring report <br /> PLANNED ACTIVITIES —THIRD QUARTER 2005 <br /> • Conduct quarterly groundwater monitoring and sampling, and, <br /> ■ Prepare and submit quarterly groundwater monitoring report <br /> E <br /> DISCUSSION <br /> On April 28, 2005, Gettler-Ryan Incorporated (G-R) performed 2Q2005 groundwater <br /> monitoring and sampling G-R's groundwater monitoring report is included in Attachment A <br /> Groundwater elevation across the site ranged from 8 24 to 8 68 feet above mean sea level <br /> (msl) Groundwater elevation across the site decreased an average of 0 07 feet from the <br /> previous sampling event Groundwater flow was calculated to the northeast at an <br /> approximate gradient from 0 002 to 0 003 A summary of total petroleum hydrocarbons as <br /> diesel (TPHd), total petroleum hydrocarbons as gasoline (TPHg), benzene, and methyl <br /> tertiary butyl ether (MtBE) laboratory analytical data is presented below <br /> • <br /> N 1PtieslProjects4ChevronlRetaiA#9-82641Penodic Monitonng4200512Q2005 QMR doc <br />