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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 /> January 23, 2006 JAS? 2 3 2006 <br /> ENVIRONN,ENT HEALTH <br /> Mr Harlin Knoll PERMIT/SERVICES <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE Fourth Quarter 2005 Groundwater Monitoring Report <br /> Chevron Service 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 Chevron Environmental <br /> Management Company (EMC), has provided this report to summarize the fourth quarter <br /> 2005 (4Q2005) groundwater monitoring event at the above-referenced site The site is <br /> currently a Chevron Service Station located at 8660 Lower Sacramento Road, Stockton, <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 the 4Q2005 groundwater <br /> monitoring and sampling event at the above referenced site (Attachment A) Before <br /> sampling, the depth to groundwater was measured in all of the wells These depths were <br /> used to calculate groundwater elevations Groundwater elevations across the site ranged <br /> from -29 45 to -29 96 feet below mean sea level (msl) Groundwater elevation across the <br /> site decreased an average of 4 21 feet from the previous sampling event Groundwater <br /> flow was calculated to the southeast at an approximate gradient of 0 002 to 0 003 A <br /> • summary of total petroleum hydrocarbons as gasoline (TPHg), benzene, methyl tertiary <br /> r <br /> I/1FileslProjectslChovronlRetaiA#9-32321Penodic Monttorrng1200514QMR0514Q05 QMR doc <br /> } R <br /> 1T3� <br /> �I <br />