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S r" <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon,California 95320-1927 <br /> Telephone (209)838-9888 <br /> FacsWule (209)838-9883 � } <br /> February 19,2004 <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 Fourth Quarter 2003 Groundwater Monitoring and Sampling Report <br /> Souza II, LLC, 612 West 11th Street, Tracy, California <br /> Site Code 0001283 <br /> Dear Ms McCartney <br /> This letter report presents the results of the fourth quarter 2003 groundwater monitoring and sampling <br /> activities at the subject site(Figure 1) <br /> Activities included monitoring depth to water in wells MW 1 through MW3, purging and sampling wells <br /> MWI through MW3, and analyzing the samples for gasoline constituents including oxygenated additives <br /> FIELD WORK <br /> Groundwater Monitoring <br /> An experienced Ground Zero technician measured the depth to groundwater in each site well on December 16, <br /> 2003 The depth to groundwater ranged from 11 51 to 12 02 feet below the tops of the well casings (btoc) <br /> The potentiometric surface rose an average of 0 75 feet between October 1, 2003 and December 16, 2003 <br /> Groundwater flowed to the north at a calculated gradient of 0 005 feet per foot, or approximately 26 feet per <br /> mile A potentiometric surface map for December 16, 2003 is presented on Figure 2 Groundwater J <br /> monitoring 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 December 16, 2003 The <br /> wells were purged of at least three well casing volumes of water using a centrifugal pump prior to sampling <br /> The field technician measured the physical parameters of temperature, pH, and electrical conductivity during <br /> the purging process Purged groundwater was contained in appropriately labeled DOT-approved 55-gallon <br /> drums, which are stored onsite pending disposal <br /> After groundwater parameters had stabilized and water levels had recovered to at least 80% of pre-purged <br /> G 1GROUNDZE15ouzalReportsl4QMR_2003 doc <br />