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f <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Mam Street l/ <br /> Escalon, Califorma 95320-1927 <br /> Telephone (209)838-988$ ��iT�� <br /> FaCsImfle (209)838-9883 <br /> E� �y <br /> July 5, 2005 <br /> Mr Michael Infiirna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Second Quarter 2005 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 second quarter 2005 groundwater monitoring and <br /> sampling activities at the subject site (Figure 1) <br /> • <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 MWI, 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 June 13, 2005, water levels were measured in the site monitoring wells Depth to <br /> groundwater in the shallow A Zone wells (MW 1 through MW4) ranged from 49 41 feet below <br /> • the top of casing (btoc) to 50 14 feet btoc Depth to groundwater in the intermediate B Zone <br /> wells (MW5 through MW7) ranged from 48 44 feet btoc to 48 97 feet btoc Depth to <br /> G IGROUNDZE\fiARRYS\Reparts\QMR1200512QM2005a doc <br />