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f <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 /> February 21, 2002 M EC <br /> FEB 2220Q <br /> Mr Michael Infurna ENVICuP'�I F I i �4r__ALTH <br /> San Joaquin County PERMII/bERVICES <br /> Environmental Health Department <br /> 304 E Weber Ave, Third Floor <br /> Stockton, CA 95202 <br /> Subject First 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 first quarter 2002 groundwater monitoring and sampling <br /> activities at the subject site(Figure I) <br /> Site Activities <br /> Activities at the site included monitoring water level elevations, purging and sampling groundwater <br /> from all site wells and resurveying all site wells as per AB 2886 Groundwater samples were <br /> analyzed for total petroleum hydrocarbons as gasoline (TPHg), total petroleum hydrocarbons as diesel <br /> (TPHd), benzene, toluene, ethylbenzene, total xylenes (BTEX), gasoline oxygenate additives, <br /> ethylenedibromide(EDB), and 1,2 dichloroethane(1,2 DCA) <br /> Fieldwork <br /> On February 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 rose an average of 2 35 <br /> feet since last monitored November 7, 2001 Groundwater flowed toward the east-northeast with a <br /> hydraulic gradient of approximately 0 002 ft/ft A potentiometnc surface map generated using the <br /> February 7, 2002 monitoring data is depicted on Figure 2 Groundwater monitoring data are <br /> summarized in Table I Monitoring data sheets are included in Attachment A <br /> Prior to sampling, monitonng wells MW1 through MW3 were purged of a minimum of three well <br /> casing volumes Dunng the purging process, the physical parameters of temperature, pH and electrical <br /> conductivity were measured During the purging of well MW3, a sheen was noted <br /> Woolsey cht%ginr11gm2002 doc <br />