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e <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> JAN 2a Nuj <br /> Escalon, California 95320-1927 <br /> Telephone (209)838-9888 E{�VIRONMI�� I;�ALTH <br /> Facsimile (209)838-9883 PERMIT/SERVICES <br /> January 27, 2003 <br /> Mr Michael Infuma <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Fourth Quarter 2002 Groundwater Monitoring and Sampling Report <br /> Former Harry's Auto Mart , 2662 N Wilson Way, Stockton, CA(Site Code 1306) <br /> Dear Mr Infiirna <br /> This letter report presents the results of the fourth quarter 2002 groundwater monitonng and sampling <br /> activities at the subject site(Figure 1) <br /> i <br /> SITE ACTIVITIES <br /> Activities at the site included monitoring water level elevations, and purging and sampling groundwater <br /> from site wells and U-Haul well MW7 Samples were analyzed for total petroleum hydrocarbons as <br /> gasoline (TPHg), benzene, toluene, ethylbenzene, total xylenes (BTEX), gasoline oxygenate additives, <br /> 1,2-dichloroethane(1,2-DCA), and ethylene dibromide(EDB) <br /> FIELDWORK <br /> Groundwater Monitoring and Sampling <br /> On December 18, 2002, water levels in wells MW 1 through MW4 and U-Haul well MW7 were <br /> monitored Groundwater elevations were calculated by measuring the depth to groundwater in each <br /> well and subtracting from the respective wellhead elevations Depth to water in the site wells ranged <br /> from 53 84 to 55 54 feet below ground surface (bgs) Groundwater rose an average of 5 14 feet since <br /> last measured on September 18, 2002 The calculated hydraulic gradient at the site was approximately <br /> 0 007 ft/ft or 37 ft/mile Apparent flow was in a southerly direction A potentiometnc surface map <br /> generated using the December 18, 2002 monitonng data is shown on Figure 2 Groundwater <br /> monitoring data are summarized in Table 1 Momtonng data sheets are included in Attachment A <br /> • <br /> 11GZA_FSISYSA11Data1GROUNDZEIHARRY6aeportslQMR1200214QM2002 doe <br />