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ONSECOR www secor Corn S E C ® R INTERNATIONAL INCORPORATED 3017 Kilgore Road,Suite 100 Rancho Cordova CA 95670 916 e61-0400 TEL 10 916 661-0430 FAX October 13, 2003 Mike Infurna San Joaquin County Environmental Health Division OCT 15 2003 304 East Weber Avenue, Third Floor Stockton, California 95202 ENVIRONMENT HEALTH RE Chevron Groundwater Monitoring Report(302003) PERMIT/SERVICES Chevron Station 9-1848 1257 West Yosemite Avenue Manteca, California SECOR Project No 77CH 00000 09 0006 Dear Mr Infurna SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management Company, is providing this report to summarize the recently completed groundwater monitoring event at the above referenced site The site is an active service station located at 1257 West Yosemite Avenue, Manteca, California COMPLETED ACTIVITIES -THIRD QUARTER 2003 ■ Conducted quarterly groundwater monitoring and sampling ■ Prepared and submitted quarterly groundwater monitoring report ■ Prepared and submitted a tracer leak detection test work plan PLANNED ACTIVITIES — FOURTH QUARTER 2003 • Conduct quarterly groundwater monitoring and sampling ■ Prepare and submit quarterly groundwater monitoring report • Conduct tracer leak detection test DISCUSSION The quarterly monitoring and sampling was performed by Gettler-Ryan, Inc (G-R) This groundwater monitoring and sampling event was performed on July 3, 2003 G-R's groundwater monitoring report is included as Attachment A Depth to groundwater across the site was approximately 19 feet below ground surface Groundwater elevation across the site decreased an average of 4 19 feet from the previous sampling event Groundwater flow was to the northeast at an approximate gradient of 0 001 ft/ft A summary of laboratory results are listed below I 11Chevron1918481Penodic Mondonng12003=2403 91848 REV A doc SECOR International Incorporated