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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Esealon, California 95320-1927 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> October 23, 2002 <br /> Ms Margaret Lagorio <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> i <br /> i <br /> i <br /> Subject Third Quarter Groundwater Monitoring and Sampling Report <br /> Souza 11, LLC, 612 West 11' Street, Tracy, California <br /> Site Code 0001283 <br /> Dear Ms Lagorio <br /> This letter report presents the results of the third quarter 2002 groundwater monitoring and <br /> sampling activities at the subject site (Figure 1) <br /> Activities included monitoring depth to water in wells MW1 through MW3, purging and <br /> sampling wells MWI through MW3, and analyzing the samples for petroleum hydrocarbon <br /> constituents <br /> FIELD WORK <br /> Groundwater Monitoring <br /> An experienced Ground Zero technician measured the depth to groundwater in each site well on <br /> September 6, 2002 Depth to groundwater ranged from 11 79 to 12 31 feet below ground surface r <br /> (bgs) The potentiometric surface fell an average of 0 78 feet since last monitored on June 11, <br /> 2002 Groundwater flowed to the north at a calculated gradient of 0 0043, or approximately 23 <br /> feet per mile A potentiometric surface map for September 6, 2002 is presented on Figure 2 <br /> Groundwater monitoring data are summarized in Table 1 Field notes are included in Attachment <br /> B <br /> GIData1GROUNDZEISouzalReportsl3QMR__2002 doe <br />