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• GROUND ZERO ANALYSIS, INC. <br /> 1714 Mam Street <br /> Escalon, California 95324-1927 <br /> Telephone (209) 838-9888 <br /> Facsimile (209) 838-9883 <br /> January 24, 2003 <br /> Ms Margaret Lagorto <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Fourth Quarter Groundwater Monitoring and Sampling Report <br /> Souza II, LLC, 612 West I I' Street, Tracy, California <br /> Site Code 0001283 <br /> Dear Ms Lagorio <br /> This letter report presents the results of the fourth 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 MW1 through MW3, and analyzing the samples for petroleum hydrocarbon <br /> constituents <br /> FIELD WORK <br /> Purgewater Disposal <br /> On October 11, 2002, American Valley Waste Oil removed and transported approximately 250 <br /> gallons of purgewater and rinsate generated from previous site activities to Seaport Environmental <br /> located in Redwood City, California for disposal Documentation is included in Attachment A <br /> Groundwater Monitoring <br /> An experienced Ground Zero technician measured the depth to groundwater in each site well on <br /> December 3, 2002 Depth to groundwater ranged from 11 28 to 11 80 feet below the tops of the <br /> G\Data\GROUNDZE\SouzalReportsl4QMR 2002 doc <br />