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4 <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> F f[D) <br /> nD <br /> December 3, 2002 DEC 0 2002 <br /> EN <br /> Mr Michael Infurna <br /> P� <br /> ERMITISEHVICES <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E Weber Ave , Third Floor <br /> Stockton, CA 95202 <br /> Subject Fourth Quarter 2002 Groundwater Monitoring and Samphng Report <br /> Woolsey Oil, Inc Cardlock Facility <br /> 1501 W Charter Way, Stockton, CA (site code 508175) <br /> Dear Mr Infurna <br /> This letter report presents the results of the fourth quarter 2002 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 from all site wells Groundwater samples were analyzed for total petroleum <br /> hydrocarbons as gasoline (TPHg), total petroleum hydrocarbons as diesel (TPHd), benzene, <br /> toluene, ethylbenzene, total xylenes (BTEX), gasoline oxygenate additives, ethylene dibromide <br /> (EDB) and 1,2 dichloroethane (1,2-DCA) <br /> Fieldwork <br /> On November 11, 2002, monitoring wells MW1 through MW5 were monitored and sampled <br /> Groundwater elevations were calculated by measuring the depth to groundwater in each well and <br /> subtracting from the respective wellhead elevation Groundwater at the site fell an average of 0 42 <br /> feet since last monitored on August 20, 2002 An apparent groundwater depression was evident <br /> near well MW3 The average hydraulic gradient across the site was approximately 0 005 ft/ft with <br /> flow converging on the apparent groundwater depression A potentiometric surface map generated <br /> using the November 11, 2002 monitoring data is depicted on Figure 2 Groundwater monitoring <br /> data are summarized in Table 1 Monitoring data sheets are included in Attachment A <br /> \IGZA FSISYS011Data1GROUNDZEIWOOLSEY CHTIQMR12002WQM2002 doc <br />