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SECOR www secor conn <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> ® INCORPORATED Rancho Cordova CA 95670 <br /> 916 861 0400 TEL <br /> 916 861 0430 FAx <br /> January 24, 2003 ' <br /> Margaret Lagorio <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> RE Chevron Groundwater Monitoring Report (4Q2002) <br /> Chevron Station 9-8264 <br /> 3775 Tracy Blvd <br /> Tracy, California <br /> SECOR Project No 77CH 00000 00 0020 <br /> Dear Ms Lagorlo <br /> SECOR International Incorporated is providing this report to summarize the recently <br /> completed groundwater-monitoring event at the above referenced site The site Is located at 3775 <br /> Tracy Blvd , in Tracy, California <br /> ACTIVITIES COMPLETED FOURTH QUARTER 2002 <br /> Conducted quarterly groundwater monitoring and sampling Prepared and submitted quarterly <br /> groundwater monitoring report <br /> PROPOSED ACTIVITIES FOR FIRST QUARTER 2003 <br /> Conduct quarterly groundwater monitoring and sampling Prepare and submit quarterly groundwater <br /> monitoring report <br /> DISCUSSION <br /> This groundwater monitoring and sampling event was performed by Gettler-Ryan Incorporated on <br /> October 28, 2002 Four wells were sampled during this event Total petroleum hydrocarbons as <br /> diesel (TPHd) was detected at concentrations of 62 micrograms per liter (pg/I) In the sample <br /> collected from MW-3 and 5,200 pg/I in the sample collected from MW-4 Total petroleum <br /> hydrocarbons as gasoline (TPHg) was detected at concentrations of 95 µg/l In the sample collected <br /> from MW-3 and 42,000 µg11 in the sample collected from MW-4 Benzene was detected at 1 Rg/I in <br /> the sample collected from MW-4 Methyl tertiary-butyl-ether (MtBE) was detected at concentrations <br /> of 550 pg/I in the sample collected from MW-4 and 1,300 µg/I in the sample collected from MW-3 <br /> Depth to water across the site decreased an average of approximately 0 44 feet from the previous <br /> quarter Groundwater flow was to the northeast at a gradient of approximately 0 002 ft/ft, generally <br /> consistent with historical data <br /> • <br /> 1 1Chevron1982644Perrodre Monitorrng120004Q2002 QMR doc SECOR International Incorporated <br />