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SECOR www secorcom <br /> ® INTERNATIONAL 3475 West Shaw Ave Suite 104 <br /> WCORPORATED Fresno CA 93711 <br /> a <br /> 559-271-5108 FAx S <br /> July 28, 2005 <br /> i <br /> JUL 2 9 2005 <br /> T <br /> Ms Vick! McCartney ENVIRONMENT HEALTH <br /> San Joaquin County/ Environmental Health Department PERMIT/SERVICES <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202-2708 ` ` l d <br /> RE Second Quarter 2005 Groundwater Monitoring Report <br /> Chevron Station 9-2033 M <br /> 508 West Charter Way <br /> Stockton, California <br /> SECOR Protect No 77CH 92033 05 <br /> Dear Ms McCartney <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental .� <br /> Management Company (EMC) has provided this report to summarize results of the second �. <br /> quarter 2005 (2Q2005) groundwater monitoring event at the above-referenced site <br /> • <br /> COMPLETED ACTIVITIES - SECOND QUARTER 2005 <br /> • Conducted quarterly groundwater monitoring and sampling, <br /> ■ Prepared and submitted quarterly groundwater monitoring report and <br /> ■ Prepared and submitted work plan for additional site assessment <br /> PLANNED ACTIVITIES - THIRD QUARTER 2005 <br /> 1 <br /> • Conduct quarterly groundwater monitoring and sampling, <br /> • Prepare and submit quarterly groundwater monitoring report, and, <br /> ■ Initiate additional site assessment activities and complete field activities for site ; <br /> conceptual model <br /> F+ <br /> DISCUSSION <br /> On May 9, 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 71 to -10 68 feet below sea level - <br /> Groundwater elevation across the site decreased an average of 2 95 feet from the previous <br /> sampling event Groundwater flow was calculated to the southeast at an approximate q <br /> gradient of 0 02 A summary of total petroleum hydrocarbons as diesel (TPHd) and as <br /> igasoline (TPHg), benzene, and methyl tertiary butyl ether (MtBE) laboratory <br /> N IFiles4ProjectslChevronlRetatA#9-20331Penodic Monttonng1200512Q2005 QMR 92033 dao <br />