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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 <br /> Telephone (20)) 38-9 8L-� E 0 <br /> Facsnntle (204 838-48833 <br /> O C I 1 9 2005 <br /> October 18, 2005 <br /> ENVIROW;ENT HEALTH <br /> PERMIT/SERVICES <br /> Mr Michael Infurna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Third Quarter 2005 Groundwater Sampling and Well Destruction 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 third quarter 2005 corrective action activities at the <br /> subject site (Figure 1) <br /> SITE ACTIVITIES <br /> Activities at the site included monitoring water level elevations, purging and sampling groundwater, <br /> and destroying the inactive domestic well located adjacent to the site All samples were analyzed <br /> for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, total xylenes <br /> (BTEX), gasoline oxygenate additives, 1,2-dichloroethane (1,2-DCA), and ethylene dibromide <br /> (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 August 29, 2005, 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 81 feet below <br /> the top of casing (btoc) to 58 51 feet btoc Depth to groundwater in the intermediate B Zone <br /> G 1GROUNDZEIHARRYS\ReportslQMR1200513QM2005a doe <br />