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rh ♦ <br /> GROUND ZERO ANALYSIS, INC. `���l I I E F MJ c l FT A� H ' �-�k� <br /> {� 1, <br /> til 7 fi � 1 til il... <br /> 1714 Maui Street <br /> Escalon, camorma 95320-1927 <br /> Telephone (209)838-9888 <br /> Farsmule (209)838-9883 <br /> June 10, 2003 <br /> Mr Michael Infarna <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E Weber Ave , Third Floor <br /> Stockton, CA 95202 <br /> Subject Second Quarter 2003 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 second quarter 2003 groundwater monitoring and <br /> sampling activities at the subject site (Figure 1) <br /> Site Activities <br /> i <br /> Activities at the site included monitoring water level elevations, purging and sampling <br /> groundwater from all site wells Groundwater samples were analyzed for total petroleum <br /> hydrocarbons as gasoline (TPHg), total petroleum hydrocarbons as diesel (TPHd), benzene, <br /> toluene, ethylbenzene, total xylenes (BTEX) and gasoline oxygenate additives <br /> I <br /> Fieldwork <br /> On May 23, 2003, 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 at the site rose an average of <br /> 0 14 feet since last monitored on February 5, 2003 The average hydraulic gradient across the <br /> site was approximately 0 002 ft/ft Groundwater flow was to the northeast A potentiometric <br /> surface map generated using the May 23, 2003 monitoring data is depicted on Figure 2 <br /> Groundwater monitoring data are summarized in Table 1 Monitoring data sheets are included in <br /> Attachment A <br /> 11GZA_FSIVOL 11DATAIGROUNDZE1WOOLSEY CHnQMW200312QM2003 doe <br />