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SAN JOAMAN <br /> &VOWWWMAL MEALYN=61'ff <br /> GROUND ZERO,ANALYSIS, INC. 1 000 E.MAIN$T <br /> 1714 Main Street om <br /> Escalon, California 95320-1927 APPWAd <br /> Telephone: (209)533-9588 A A � � � s <br /> Facsimile- (209)833-9883 O <br /> December 17, 2007 <br /> AW3 <br /> Mr. Michael Infuma =&W dM nd KdhWftoft togo <br /> P! 61W Or <br /> San Joaquin County doYlimn*0M ofsm bwp " <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton, CA 95202 <br /> Subject: Fourth Quarter 2007 Groundwater Sampling Report <br /> Valley Pacific Petroleum Services, Inc. (Woolsey 011, 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 2007 groundwater monitoring and <br /> sampling activities at the subject site (Figure 1). <br /> QUARTERLY GROUNDWATER SAMPLING ACTIVITIES <br /> Activities at the site included monitoring water level elevations, and 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, toluene, <br /> ethylbenzene, total xylenes (BTEX), and gasoline oxygenates. <br /> Fieldwork <br /> On November 7, 2007, monitoring wells NMI 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 decreased by <br /> an average of 0,42 feet since last monitored on August 28, 2007. Groundwater flow was generally <br /> toward the northeast, with components of northerly and northwesterly flow, at a hydraulic gradient <br /> averaging approximately 0.002 Wit A potentiometric surface map created from the November 7, <br /> 2007 monitoring data is depicted on Figure 2. Groundwater elevation data are summarized in Table <br /> 1. Monitoring data sheets are included in Attachment A. <br /> Prior to sampling, monitoring wells MW1 through MW5 were purged of a minimum of three well <br /> casing volumes. During the purging process, temperature, pH and electrical conductivity parameters <br /> GAGROuNMM— V0oL5rv.C1rrRepon5,q�,irzv00-1�4q;u2007.d« <br />