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t <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon,California 95320-1927 <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-9883 <br /> July 10, 2007 JUL, I P 2007 <br /> HEAL <br /> Mr. Michael Infurna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Second Quarter 2007 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 2007 corrective. action activities at the <br /> 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 MW 1, 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 19, 2007, 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 46.42 feet below i <br /> the top of casing (btoc) to 47.17 feet btoc. ,Depth to groundwater in the intermediate B Zone <br /> wells (MW5 through MW7) ranged from 45.42 feet btoc to 45.93 feet btoc. Depth to <br /> G:\GROUNDZE\HARRYS\Reports\QMR\2007\2QM2007.doc <br /> i\ 1 <br />