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0/0 <br /> SECOR vw�secoreorRoad Suite 140 <br /> com <br /> INTERNATIONAL <br /> Rancho Cordova CA 95674 <br /> Kilg <br /> E C ® R INCORPORATED Ran <br /> 916-861-0400 TEL <br /> 916-061-0430 FAX <br /> October 15, 2004 nn <br /> Dgr-,- �}���V <br /> Mr Michael Infurna <br /> San Joaquin County Environmental Health Division GOT1 <br /> 304 East Weber Avenue,Third Floor HEAUH <br /> Stockton, California 95202 EN\I4RUNWEM <br /> RE Third Quarter 2004 Groundwater Monitoring Report <br /> P�RMI�ISERVIU�S <br /> Chevron Service Station 9-1848 <br /> 1257 West Yosemite Avenue <br /> Manteca, California <br /> SECOR Project No 77CH 00000 23 0008 <br /> Dear Mr Infurna <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management <br /> Company (Chevron), has provided this report to summarize results of the third quarter 2004 <br /> (3Q2004) groundwater monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES -THIRD QUARTER 2004 <br /> ■ Conducted quarterly groundwater monitoring and sampling, and, <br /> ■ Prepared and submitted quarterly groundwater monitoring report <br /> PLANNED ACTIVITIES— FOURTH QUARTER 2004 <br /> ■ Conduct quarterly groundwater monitoring and sampling, <br /> ■ Prepare and submit quarterly groundwater monitoring report, and, <br /> ■ Prepare and submit a work plan for leak detection test <br /> DISCUSSION <br /> On August July 21, 2004, Gettler-Ryan Incorporated (G-R) performed 302004 groundwater <br /> monitoring and sampling G-R's groundwater monitoring report is included as Attachment A Depth <br /> to groundwater across the site was approximately 22 68 feet below ground surface (bgs) <br /> Groundwater elevation across the site decreased an average of 4 19 feet from the previous sampling <br /> event Groundwater flow was to the northeast at an approximate gradient of 0 007 feet per foot A <br /> summary of total petroleum hydrocarbons as gasoline (TPHg), benzene, and methyl tertiary butyl <br /> ether(MtBE) laboratory analytical data is listed below <br /> i <br /> 1%Chevron1918481Penodic Mon itoring120041302004 91848 doc SECOR Intemational Incorporated <br />