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GROUND ZERO ANALYSIS9 INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> i f <br /> March 15, 2001 <br /> Mr Mnchael Infurna <br /> San Joaquin County Public Health Services, <br /> Environmental Health Division <br /> 304 E Weber Ave, Third Floor <br /> Stockton, CA 95202 <br /> Subject First Quarter 2001 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 2001 groundwater monitoring and sampling <br /> activities at the subject site(Figure 1) <br /> STTE ACTTVnUS <br /> Activities at the site included monitoring water level elevations and purging and sampling groundwater <br /> from 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, 1,2 dichloroethane(1,2 DCA), and ethylene dlbromide (EDB) <br /> FIELDWORK <br /> Groundwater Monitoring and Sampling <br /> On February 27, 2001 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 rose an average of 0 91 <br /> feet since last monitored on November 3, 2000 Groundwater flow was in a northwesterly direction <br /> • with a hydraulic gradient of approximately 0 013 ft/ft A potentiometnc surface map generated using <br /> --isey chtlgmr11gm2001 doc <br />