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GROUND ZERO ANALYSIS, INC. <br /> 1714 Mam Street <br /> Fscalon, California 95320-1927 -- <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 - <br /> S E P 2 1 2004 <br /> September 20, 2004 ENVIRONf'1i=N1 hL,,LI ci <br /> PERMTSEFMCES <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 2004 Groundwater Monitoring and Sampling Report ,flfZy <br /> Former Harry's Auto Mart, 1f✓ <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 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 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 MW11) <br /> On August 30, 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 59 04 feet below the <br /> top of casing (btoc) to 63 45 feet btoc MW2 was dry Depth to groundwater in the intermediate <br /> B Zone wells (MW5 through MW7) ranged from 61 64 feet btoc to 62 27 feet btoc Depth to <br /> 11GZA FSIVOL 11DATAIGROUNDZEIHARRYS1ReportslQMR1200413QM2004a doc <br />