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SECOR www secor com ® p� L!� �J � to 1;13a1v+Kdgore Road Swte 100 �[ _f;+,} Rancho Cordova,CA 96670 916-861-0400 ILL 916-861-0430 FAx 03 OCT 30 PM 1 32 October 27, 2003 Harlin Knoll San Joaquin County Environmental Health Department 304 East Weber Avenue, Third Floor Stockton, California 95202 RE Third Quarter 2003 Groundwater Monitoring Report Former Chevron Station 9-8632 575 Grant Line Road Tracy, California SECOR Project No 77CH 00000 09 0021 Dear Mr Knoll SECOR International Incorporated (SECOR) Is providing this report to summarize the third quarter groundwater monitoring event at the above referenced site COMPLETED ACTIVITIES - THIRD QUARTER 2003 ■ Conducted quarterly groundwater monitoring and sampling • Prepared and submitted quarterly groundwater monitoring report • Conducted and submitted a transducer study of groundwater influence due to pumping of the City of Tracy Ball Park water supply well PLANNED ACTIVITIES - FOURTH QUARTER 2003 I ■ Conduct quarterly groundwater monitoring and sampling • Prepare and submit quarterly groundwater monitoring report DISCUSSION On July 30, 2003, Gettler-Ryan Incorporated (G-R) performed the third quarter groundwater monitoring and sampling event for 2003 G-R's Groundwater monitoring report Is Included as Attachment 1 Depth to groundwater across the site ranged from 5 98 to 7 89 feet below ground surface (bgs) Groundwater across the site decreased an average of 0 58 feet from the previous sampling event The groundwater flow direction was reported to the northwest at an approximate gradient of 0 005 feet per foot (ft/ft) Eight wells were sampled during this event A summary of e- laboratory data is listed below j 1 4Ch9vron4986321Penodjc Monitonng42003002003 QMR 98632 Rev A doc SECOR Intematlona!Incorporated