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i <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Alain Street <br /> Escalon, California 95320-1927 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> May 21, 2002 <br /> MAY 2 3 2002 <br /> ENVIR(JNkAENT HEALTH <br /> PERMIT/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 Second 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 second quarter 2002 groundwater monrtonng and sampling <br /> activities at the subject site (Figure 1) <br /> Site Activities <br /> Activities at the site included morntonng water level elevations, and purging and sampling groundwater <br /> from all site wells Groundwater samples were analyzed for total petroleum hydrocarbons as gasoline <br /> (TPHg), total petroleum hydrocarbons as diesel (TPHd), benzene, toluene, ethylbenzene, total xylenes <br /> (BTEC, gasoline oxygenate additives, ethylenednbromlde(EDB), and 1,2-dichloroethane(1,2-DCA) <br /> Fieldwork <br /> On May 7, 2002, monitoring wells MW 1 through MW3 were monitored and sampled 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 fell an average of 0 40 feet since last <br /> monitored February 7, 2002 Groundwater flowed in a east-southeasterly direction with a hydraulic <br /> gradient of approximately 0 002 ft/ft A potentlometnc surface map generated using the May 7, 2002 <br /> monitoring data is depicted on Figure 2 Groundwater monitoring data are summarized in Table 1 <br /> Monitoring data sheets are included in Attachment A <br /> Prior to sampling, monitoring wells MW 1 through MW3 were purged of a nin mum of three well <br /> casing volumes During the purging process, the physical parameters of temperature, pH and electrical <br /> conductivity were measured During the purging of well MW3, a slight sheen was noted <br /> Woolsey cht\gmr\2gm2002 doc <br />