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Y <br /> GROUND ZERO ANALYSIS, INC. p4i1gkCj1ApE1,d[Ai HEAL110 <br /> . <br /> p. r;Y17 SERVICE <br /> 1714 Main Street <br /> Escalon, California 95320-1927 03 APR 23 PM �'• <br /> Telephone (209)838-9888 <br /> Facsimile (209) 838-9883 <br /> April 22, 2003 <br /> 1 <br /> Ms Vicki McCartney <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject First Quarter 2003 Groundwater Monitoring and Sampling Report <br /> Souza II, LLC, 612 West I Ith Street, Tracy, California <br /> Site Code 0001283 <br /> Dear Ms McCartney <br /> This letter report presents the results of the first quarter 2003 groundwater monitoring and sampling activities <br /> at the subject site (Figure 1) <br /> Activities included monitoring depth to water in wells MWl through MW3, purging and sampling wells MWl <br /> through MW3, and analyzing the samples for petroleum hydrocarbon constituents and gasoline additives <br /> FIELD WORK <br /> Groundwater Monitoring <br /> An experienced Ground Zero technician measured the depth to groundwater in each site well on March 5, <br /> 2003 The depth to groundwater ranged from 10 82 to 11 33 feet below the tops of the well casings (btoc) <br /> The potentiometnc surface rose an average of 0 46 feet since last monitored on December 3, 2002 <br /> Groundwater flowed to the north at a calculated gradient of 0 0049 feet per foot, or approximately 26 feet per <br /> mile A potentiometnc surface map for March 5, 2003 is presented on Figure 2 Groundwater monitoring <br /> data are summarized in Table 1 Field notes are included in Attachment A <br /> Groundwater Sampling <br /> An experienced Ground Zero technician purged and sampled the site wells on March 5, 2003 The wells were <br /> purged of at least three well casing volumes of water using a centrifugal pump prior to sampling The field <br /> technician measured the physical parameters of temperature, pH, and electrical conductivity during the <br /> purging process Purged groundwater was contained in appropriately labeled DOT-approved 55-gallon <br /> drums, which are stored onsite pending disposal <br /> G 1GROUNDZE1SouzalReportsllQMR_2003 doc <br />