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GROUND ZERO ANALYSIS, INC. sr LL <br /> 1714 Main Street �rt <br /> Escalon,California 95320-19276 <br /> Telephone (209)838-9888 11 <br /> Facsumle (209)838-9883 <br /> �AY <br /> May 7, 2004 EN��RON SER�IICES H <br /> PERM1 l <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 2004 Groundwater Monitoring and Sampling Report <br /> Souza II, LLC, 612 West I lth Street, Tracy, California <br /> Site Code 0001283 <br /> Dear Ms McCartney <br /> This letter report presents the results of the first quarter 2004 groundwater monitoring and sampling <br /> activities at the subject site (Figure 1) <br /> Activities included monitoring depth to water in wells MW1 through MW3, purging and sampling wells <br /> MW 1 through MW3, and analyzing the samples for gasoline constituents including oxygenated additives In <br /> addition to routine groundwater monitoring, additional subsurface investigation was conducted at the request <br /> of the San Joaquin County Environmental Health Department (EHD) A summary report of the additional <br /> subsurface investigation was submitted under separate cover <br /> FIELD WORK <br /> Groundwater Monitoring <br /> An experienced Ground Zero technician measured the depth to groundwater in each site well on March 30, <br /> 2004 The depth to groundwater ranged from 10 90 to 1141 feet below the tops of the well casings (btoc) <br /> The potentiometric surface rose an average of 0 61 feet between December 16, 2003 and March 30, 2004 <br /> Groundwater flowed to the north at a calculated gradient of 0 005 feet per foot, or approximately 27 feet per <br /> mile A potentiometric surface map for March 30, 2004 is presented on Figure 2 Groundwater monitoring <br /> data are summarized in Table I Field notes are included in Attachment A <br /> Groundwater Sampling <br /> An experienced Ground Zero technician purged and sampled the site wells on March 30, 2004 The wells <br /> were purged of at least three well casing volumes of water using a centrifugal pump prior to sampling The <br /> field 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 /> G 1GROUNDZEISouzalReportslQMR1200411QMR 2004 doe <br />