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SECOR www secorcom <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> S E C ® R INCORPORATED Rancho Cordova,CA 98670 ` <br /> 916 861 0400 TEL <br /> 916 861 0430 Fnx <br /> January 21, 2003 <br /> Harlin Knoll JAN 2 2 2003 <br /> San Joaquin County <br /> Environmental Health Department ENVIr�uNMENT HEALTH <br /> 304 East Weber Avenue, Third Floor PERMIT/SERVICES <br /> Stockton, CA 95202 <br /> RE Chevron Groundwater Monitoring Report (4Q2002) <br /> Chevron Station 9-3232 <br /> 8660 Lower Sacramento Road <br /> Stockton, California <br /> SECOR Project No 770H 00000 00 0012 <br /> Dear Mr Knoll <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 8660 <br /> Lower Sacramento Road, in Stockton, California y <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 Inc on October 24, <br /> 2002 Groundwater samples were collected from ten wells during this event , Total petroleum <br /> hydrocarbons as gasoline (TPHg) was detected in samples collected from five of the ten wells, at <br /> concentrations ranging from 170 micrograms per liter (µg11) in the sample from MW-1 to 8,700 µg11 in <br /> the sample from MW-4D Benzene was detected In samples collected from three of the ten wells, at <br /> concentrations of 290 µg/l in the samples from MW-1, 18 µg11 in the sample from MW-3, and 670 µg11 <br /> in the sample from MW-4D Methyl tertiary-butyl-ether (MtBE) was detected In samples collected <br /> from two of the ten wells, at concentrations of 6 µg/l in the sample from MW-3 and 2 µg/I in the <br /> sample from MW-4D Depth to water across the site increased by an average of approximately 1 73 <br /> feet from the previous quarter The groundwater flow direction was to the southeast at 0 003 to <br /> 0 006 ft/ft, consistent with the previous monitoring event <br /> Y <br /> kF <br /> 'C3 <br /> , <br /> r; 1 <br /> 1 <br /> 14Chevront932321Penodre Monrtonng12000402002 QMR doc SECOR International Incorporated 6 <br /> .r <br /> l 1 <br />