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4 ` J <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Maus Street <br /> Escalon,California 45320-1927 <br /> Telephone (209)838-9888 <br /> Facsunde (209)838-9883 <br /> January 6, 2005 <br /> ENVIR��M SSRI SES H <br /> Mr Michael Infurna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Fourth Quarter 2004 Groundwater Monitoring and Sampling Report <br /> Former Harry's Auto Mart, <br /> 2662 N Wilson Way, Stockton, CA (Site Code 1306) <br /> Dear Mr Infurna <br /> This letter report presents the results of the fourth quarter 2004 groundwater monitoring and <br /> • sampling activities at the subject site (Figure 1) <br /> SITE ACTIVITIES <br /> Activities at the site included monitoring water level elevations and purging and sampling <br /> groundwater All samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), <br /> benzene, toluene, ethylbenzene, total xylenes (BTEX), gasoline oxygenate additives, 1,2- <br /> dichloroethane (1,2-DCA), and ethylene dibromide (EDB) <br /> FIELDWORK <br /> Groundwater Monitoring <br /> Based upon the observation at the adjacent U-Haul site that potentiometric surface elevation and <br /> groundwater flow varies with completion depth, the wells at the site have informally been divided <br /> into three zones of completion a shallow or "A Zone" represented by wells MW1, MW2, MW3 <br /> and MW4, an intermediate zone ("B Zone") represented by wells MW5, MW6 and MW7, and a <br /> deeper "C Zone" represented by MW1D <br /> On December 20, 2004, water levels were measured in the site monitoring wells Depth to <br /> groundwater in the shallow A Zone wells (MW1 through MW4) ranged from 57 33 feet below <br /> the top of casing (btoc) to 58 08 feet btoc Depth to groundwater in the intermediate B Zone <br /> wells (MW5 through MW7) ranged from 56 28 feet btoc to 56 75 feet btoc Depth to <br /> 0 1GROUNDZEIHARRY51Reports\QMR000414QM2004a doc <br />