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�4ROUND ZERO ANALYSIS INC. <br /> 1714 Main Street <br /> Escalon, Cahforma 95320-1927 MCEVED <br /> Telephone (209)838-9888 <br /> Facsmule (209)838-9883 <br /> FEB 2 1 2003 <br /> Feb ENVIRONMENT HEALTH <br /> February 20, 2003 PERMITISERMES <br /> Mr Mlchaellnfurna <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E Weber Ave , Third Floor <br /> Stockton, CA 95202 <br /> Subject First Quarter 2003 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 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 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 February 5, 2003, monitoring wells MW1 through MW5 were monitored and sampled <br /> Groundwater elevations were calculated by measuring the depth to groundwater in each well <br /> and subtracting from the respective wellhead elevation Groundwater at the site rose an <br /> average of 1 64 feet since last monitored on November 11, 2002 The average hydraulic <br /> gradient across the site was approximately 0 002 ft/ft Groundwater flow was to the northeast <br /> A potentiometric surface map generated using the February 5, 2003 monitoring data is depicted <br /> on Figure 2 Groundwater monitoring data are summarized in Table 1 Monitoring data <br /> sheets are included in Attachment A <br /> 11GZA FSIvoL IIDATAIGROUNDZEIWOOLSEY CHTIQMR1200311QM2003 doe <br />