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GROUND ZERO .ANALYSIS, INC. JIJry 2 9 2005 <br /> • 1714 Main StreetQA14FJVj�Ej� <br /> Escalun,California 9532x1927 ENWPERAAiT/SI:RVtCES <br /> Telephone (209)838-9888 <br /> Facsande (209)838-9883 <br /> June 28, 2005 <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 Second 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 second quarter 2005 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 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 June 1, 2005, monitoring wells MWl 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 53 feet since last monitored on February 9, 2005 The average hydraulic gradient <br /> across the site was approximately 0 003 ft/ft Groundwater flow was toward the northeast A <br /> potentiometric surface map created from the June 1, 2005 monitoring data is depicted on Figure 2 <br /> Groundwater elevation data are summarized in Table 1 Monitoring data sheets are included in <br /> Attachment A <br /> Prior to sampling, monitoring wells MW 1 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 1GROUNDZEMOOLSEY CtMQMR12005UQM2005 doe <br />