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GROUND ZERO ANALYSIS, INC. ���u <br /> 1714 Main Street MAR 9 N04 <br /> Escalon,Califorma 95320-1927 <br /> Telephone (209)838-9888 ENVIRONMENT HEALI H <br /> Facsunde (209)838-9883 PERMIT/SERVICES <br /> March 8, 2004 <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 2004 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 2004 groundwater monitoring and sampling <br /> P g <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 12, 2004, monitoring wells MW1 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 85 feet since last monitored on November 5, 2003 The average hydraulic gradient <br /> across the site was approximately 0 003 ft/ft Groundwater flow was toward the east and northeast <br /> A potentiometric surface map generated using the February 12, 2004 monitoring data is depicted on <br /> Figure 2 Groundwater monitoring data are summarized in Table 1 Monitoring data sheets are <br /> included in Attachment A <br /> IIGZA_FSIVGL 11DATAIGROUNDZEM00LSEY CHTIQMR1200411QM2004 doc <br />