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GROUND ZERO ANALYSIS, INC. R EC EN E D <br /> 1714 Main Street J U L 2 4 ZUUb <br /> Escalon,California 95320-1927 <br /> Telephone: (209)838-9888 ENVIRONMENT HEALTH <br /> Facsimile: (209)838-9883 PERMIT/SERVICES <br /> July 20, 2006 <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 2006 Groundwater Monitoring and Sampling Report <br /> Former Harry's Auto Mart, <br /> 2662 N. Wilson Way, Stockton, CA (Site Code: 1.306) <br /> Dear Mr. Infurna: <br /> This letter report presents the results of the second quarter 2006 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 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 June 5, 2006, water levels were measured in the site monitoring wells. Depth to groundwater <br /> in the shallow A Zone wells (MW 1 through MW4) ranged from 41.97 feet below the top of <br /> casing (btoc) to 42.61 feet btoc. Depth to groundwater in the intermediate B Zone wells (MW5 <br /> through MW7) ranged from 40.90 feet btoc to 41.51 feet btoc. Depth to groundwater in C Zone <br /> well MW1D was 42.74 feet btoc. Since previously measured on March 13, 2006, water levels <br /> rose an average of 3.47 feet in the A Zone wells, 3.41 feet in the B Zone wells, and 3.41 feet in <br /> G:\GROUNDZE\HARRYS\Rcports\QMR\2006\2QM2006.doc <br />