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MD <br /> GROUND ZERO ANALYSIS, INC. <br /> IAA?N ?nn5 <br /> 1714 Maui Street ENVIRONMENT HEALTHFscalon,California 95320-1927 PERMIT/SERVICES <br /> (269)838-9888 <br /> Facsirnde (209)838-9883 <br /> March 1, 2005 <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 First Quarter 2005 Groundwater Monitoring and Sampling Report <br /> Valley Pacific Petroleum Services, Inc (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 2005 groundwater monitoring and sampling <br /> activities at the subject site (Figure 1) <br /> Site Activities <br /> Activities at the site included monitoring water level elevations, purging and sampling groundwater <br /> from all site wells Groundwater samples were analyzed for total petroleum hydrocarbons as <br /> gasoline (TPHg), total petroleum hydrocarbons as diesel (TPHd), benzene, toluene, ethylbenzene, <br /> total xylenes (BTEX), and gasoline oxygenate additives <br /> Fieldwork <br /> On February 9, 2005, monitoring wells MWl through MW5 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 elevations at the site rose an -' <br /> average of 1 75 feet since last monitored on November 23, 2004 The average hydraulic gradient <br /> across the site was approximately 0 002-0 004 ft/ft Groundwater flow was toward the north, but <br /> with components of northwest and northeast flow A potentiometric surface map created from the <br /> February 9, 2005 monitoring data is depicted on Figure 2 Groundwater elevation data are <br /> summarized in Table 1 Monitoring data sheets are included in Attachment A <br /> Prior to sampling, monitoring wells MW 1 through MW5 were purged of a minimum of three well <br /> 10) casing volumes During the purging process, temperature, pH and electrical conductivity <br /> parameters were measured <br /> G IGROUNDzE1WOOLSEY CHTIQMR1200511QM2005 doc <br />