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GROUND ZERO ANALYSIS, INC. <br /> • 1714 Main Street <br /> Escalon,California 95320-1927 <br /> Telephone (209)838-9888 <br /> Facsunile (209)838-9883 v <br /> SES' — 7 2005 <br /> September 2, 2005 <br /> ENV PONMENT NEMC$ <br /> PER ,n'T/SERVINGS <br /> Mr Michael Infiarna <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E Weber Ave , Third Floor <br /> Stockton, CA 95202 <br /> Subject Third 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 third 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 oxygenates and additives <br /> Fieldwork <br /> On August 24, 2005, monitoring wells MW 1 through MWS 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 fell by an <br /> average of 1 58 feet since last monitored on June 1, 2005 Groundwater flow was toward the <br /> northeast at a hydraulic gradient of approximately 0 005 ft/ft A potentiometric surface map created <br /> from the August 24, 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 MWl through MW5 were purged of a minimum of three well <br /> casing volumes During the purging process, temperature, pH and electrical conductivity <br /> . parameters were measured <br /> G 1GROUNDZEIWOOLSEY CH1IQMR12005\3QM2005 doc <br />