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t <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 /> August 27, 2002 <br /> A G G 2 8 2002 <br /> ENVIROMENT HEALTH <br /> PERIMIT/SERVICES <br /> Mr Michael Infurna <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E Weber Ave , Third Floor <br /> Stockton, CA 95202 <br /> Subject Third Quarter 2002 Groundwater Monitoring and Sampling 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 third 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, 1,2 dichloroethane (1,2- <br /> DCA), ethylene dibromide (EDB) and dissolved lead <br /> Fieldwork <br /> On August 7, 2002, monitoring wells MW1 through MW3 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 1 52 <br /> feet since last monitored May 7, 2002 Groundwater flowed in an easterly direction with a <br /> hydraulic gradient of approximately 0 002 ft/ft A potentiometric surface map generated using the <br /> August 7, 2002 monitoring data is depicted on Figure 2 Groundwater monitoring data are <br /> summarized in Table 1 Monitoring data sheets are included in Attachment A <br /> I1GZA_FSISYS011Data1GROUNDZEIWOOLSEY CHTIQMR1200213QM2002 doc <br />