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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main StreetEscal [� <br /> Telephone <br /> e (209 8 95320-1927 ^ Jf <br /> Telephone (209)838-9888 ((�"L� �C <br /> Facsnnile (209)838-9883 <br /> MAR 2 8 2003 <br /> ENVIRONMENT HEALTH <br /> March 27, 2003 PERMIT/SERVICES <br /> Mr Michael Infurna <br /> San Joaqum County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject First Quarter 2003 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 first quarter 2003 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, purging and sampling <br /> groundwater from site wells and U-Haul well MW7, and disposing of purgewater Samples were <br /> analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, <br /> total xylenes (BTEX), gasoline oxygenate additives, 1,2-dlchloroethane (1,2-DCA), and ethylene <br /> dibromlde (EDB) <br /> FIELDWORK <br /> Groundwater Monitoring and Sampling <br /> On March 18, 2003, water levels in wells MW1 through MW4 and U-Haul well MW7 were <br /> monitored Groundwater elevations were calculated by measuring the depth to groundwater in <br /> each well and subtracting from the respective wellhead elevations Depth to water in the site <br /> wells ranged from 50 50 to 52 19 feet below ground surface (bgs) Groundwater rose an <br /> average of 3 33 feet since last measured on December 18, 2002 The hydraulic gradient at the <br /> 40 site averaged approximately 0 005 feet/foot in a southerly direction <br /> GIGROUNDZEIHARRYS\Reports\QMR1200311QM2003 doc <br />