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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> ESC00", Cahforma 95320-1927 <br /> Telephone (209)838-9888 <br /> FacsmWe (209)838-9883 DE2003 <br /> C 2 2 <br /> ENVIRONMENT <br /> H <br /> December 19, 2003 <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 Fourth Quarter 2003 Groundwater Monitoring and Sampling Report <br /> Valley Pacific Petroleum Services, Inc (Woolsey 411, 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 fourth quarter 2003 groundwater monitoring and <br /> sampling activities at the subject site (Figure 1) <br /> Site Activities <br /> Activities at the site included monitoring water level elevations, purging and sampIing 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 November 5, 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 elevations at the site fell an <br /> average of 1 05 feet since last monitored on August 13, 2003 The average hydraulic gradient <br /> across the site was approximately 0 002 — 0 003 ft/ft Groundwater flow was toward the east and <br /> northeast A potentlometrlc surface map generated using the November 5, 2003 monitoring data is <br /> depicted on Figure 2 Groundwater monitoring data are summarized in Table 1 Monitoring data <br /> sheets are included in Attachment A <br /> 1SGZA_FSIVOL_11DATAIGROUNDZEIWOOLSEY CH nQMR1200314QM2003 doc <br />