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. GROUND ZERO ,ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> October 23, 2002 <br /> Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Third Quarter 2002 Groundwater Monitoring and Sampling Report <br /> Former M&K Market, 8960 West Walnut Grove Rd, Thornton, California <br /> Dear Mr Knoll <br /> Tlus letter report presents the results of the third quarter 2002 groundwater monitoring and sampling <br /> activities at the subject site(Figure 1) <br /> SITE ACTIVYT ES <br /> Activities at the site included monitoring water level elevations, purging and sampling groundwater <br /> monitoring wells, and analyzing groundwater samples for benzene, toluene, ethylbenzene, total xylenes <br /> (BTEC, 1,2-dichloroethane (1,2-DCA), ethylene dibronude (EDB), and oxygenated gasoline <br /> additives <br /> FIELDWORK <br /> Groundwater Monitoring and Sampling <br /> An experienced field technician monitored and sampled wells MW1 through MW4 on September 4, <br /> 2002 Groundwater elevations were calculated by measuring the depth to groundwater in each well <br /> and subtracting the measured value from the respective wellhead elevation The depth to water in the <br /> wells ranged from 6 63 feet below ground surface (bgs) in well MW4 to 7 98 feet bgs in well MW3 <br /> • Groundwater generally flowed toward the southwest with an average gradient of 0 002, or <br /> approximately 11 feet per mile The groundwater surface rose an average of 0 39 feet between March <br /> GIDaWGROUNDZE1Bamyard-ManserlReportslQMR\3QM2002 doc <br />