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SEP 2 6 2003 <br /> GROUND ZERO ANALYSIS, INC. <br /> ENVIRONMENT HEALTH <br /> 1714 Maui Street <br /> ICES <br /> Escalon, California 95324-1927 <br /> Telephone (209)838-9888 <br /> Faesumle (209)838-9883 <br /> September 25, 2003 <br /> Mr Michael In_ urns <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E Weber Ave , Third Floor <br /> Stockton, CA 95202 <br /> Subject Third 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 third quarter 2003 groundwater monitoring and sampling <br /> activitics 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 August 13, 2003, monitoring wells MWI 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 fell an average of 1 39 <br /> feet since last monitored on May 23, 2003 The average hydraulic gradient across the site was <br /> approximately 0 002 ft/ft Groundwater flow was to the northeast A potentiometric surface map <br /> generated using the August 13, 2003 monitoring data is depicted on Figure 2 Groundwater <br /> monitoring data are summarized in Table 1 Monitoring data sheets are included in Attachment A <br /> Prior to sampling, monitoring wells MWI through MW5 were purged a minimum of three well <br /> casing volumes During the purging process, temperature, pH and electrical conductivity <br /> parameters were measured <br /> • Samples were collected after parameter stabilization, and appropriate water level recovery Purge <br /> G IGROUNDZEIWOOLSEY CHTIQMR1200313QM2003 doc <br />