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y. <br /> .ya <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main,Street A� z. <br /> Escalon, California 95320-1927 <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-9883 <br /> March 19, 2002 <br /> Ms. Margaret Lagorio j <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Verification Groundwater Sampling Report <br /> Former Valley Volkswagen, 647 E. Miner Ave., Stockton, CA (Figure 1) <br /> Site Code: 1187 <br /> Dear Ms. Lagorio: <br /> Ground Zero Analysis, Inc. (Ground Zero) is submitting this groundwater sampling report for the <br /> above referenced site on behalf of Mr, JayFriedman. This report documents the most recent <br /> p <br /> groundwater quality data for the site. This verification sampling event was performed as directed by <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) in <br /> correspondence dated September 14, 2001. Subsequent phone conversations with Regional Water <br /> Quality Control Board (RWQCB) and PHS/EHD indicated that two additional monitoring and <br /> sampling events were required prior to considering the site for closure. <br /> SITE ACTIVITIES <br /> Activities at the site included monitoring water Ievel elevations and purging and sampling groundwater <br /> from both site monitoring wells (Figure 2). Groundwater samples were analyzed for total petroleum <br /> hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, total xylenes (BTEX), gasoline <br /> oxygenate additives, ethylene dibromide (EDB) and 1,2 dichloroethane (1,2 DCA). In addition, the <br /> monitoring well locations and elevations were professionally surveyed as required by A132886 and <br /> drummed purge water was transported offsite for disposal. <br /> FIELDWORK <br /> Groundwater Monitoring and Sampling <br /> On March 11, 2002, depth to water was measured in monitoring wells MW1 and MW2. Groundwater <br /> elevations were calculated by measuring the depth to groundwater in each well and subtracting from <br /> the respective wellhead elevation. Groundwater at the site rose an average of 0.09 feet since last <br /> monitored on October 26, 2001. Groundwater elevation data are summarized in Table 1. <br /> G:\Data\GROUNDZE\VALLEYVW\QNMkIQM2002.doc <br />