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SECOR www Secorcorn <br /> ® INTERNATiONAL 3017 Kilgore Road Suite 100 <br /> INCORPORATED Rancho Cordova CA 95670 <br /> . 916 861 0400 TEL <br /> 916 861 0430 Kax Z-" <br /> 'v <br /> :3 <br /> January 24, 2003 r <br /> SIDa=ir <br /> Harlin Knoll <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 East Weber Avenue, Third Floor �P ENS N�ES <br /> Stockton, CA 95202 EN�ppE M}SE��1G Y <br /> RE Chevron Groundwater Monitoring Report (4Q2002) <br /> Chevron Station 9-8632 <br /> 575 Grant Line Road „ 7 <br /> Tracy, Californiag <br /> SECOR Project No 77CH 00000 00 0021 <br /> Dear Mr Knoll <br /> SECOR International Incorporated Is <br /> p providing this report to summarize the recently <br /> completed groundwater-monitoring event at the above referenced site The site is located at 575 <br /> Grant Line Road, In Tracy, California <br /> ACTIVITIES COMPLETED FOURTH QUARTER 2002 <br /> r� <br /> r�,s <br /> Conducted quarterly groundwater monitoring and sampling Prepared and submitted quarterly 5 <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 /> A <br /> This groundwater monitoring and sampling event was performed by Gettler-Ryan Incorporated on ; <br /> October 31, 2002 Groundwater samples were collected from eight wells during this event Total f <br /> petroleum hydrocarbons as diesel (TPHd) were detected at concentrations of 120 micrograms per , <br /> liter (pg/l) in the sample collected from MW-3, 220 µg/l in the sample collected from MW-5, and 130 <br /> µg/l In the sample collected from MW-7 Total petroleum hydrocarbons as gasoline (TPHg) were <br /> detected at concentrations of 880 µg/1 in the sample collected from MW-3 and 690 pg/I in the sample <br /> collected from MW-7 Benzene was detected at concentrations of 18 µg/I in the sample collected A, <br /> from MW-3, 3 µg11 in the sample collected from MW-4, and 23 µg/l in the sample collected from MW- <br /> 7 Methyl tertiary-butyl-ether (MtBE) was detected at concentrations ranging from 7 µg/I in the <br /> sample collected from MW-6A to 250 pg/l in the sample collected from MW-2 Depth to water in the <br /> monitoring wells decreased by an average of 0 09 feet from the previous quarter Groundwater flow <br /> was to the northwest at 0 005 ft/ft, consistent with previous monitoring events <br /> H � <br /> i <br /> I lChevron1986321Penodfc Monrtonng1200214=02 QMR doc SECOR International Incorporated <br />