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I <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon,California 95320-1927 <br /> Telephone:(209)838-9888 <br /> racsirn le:(209)838-9883 <br /> a <br /> August 14,2007 <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 2007 Groundwater Sampling Report <br /> Valley Pacific.Petroleum Services,Inc. (Woolsey Oil,hic.),Cardlock Facility <br /> 1501 W. Charter)N'ay, Stockton,CA(Site Code 5081"75) <br /> Dear-Mr. hif irna: <br /> This letter report presents the results of the seco >quart <br /> 2007 �ouadwatermonitoringng and <br /> sampling activities at.the subJeefsite (Figure 1).. <br /> F <br /> QUARTERLY GROUNDWATER SAIMPLING ACTIVITIES <br /> Activities at the site included monitorilg 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($TEX), and gasoline oxygenates.. <br /> Fieldwork <br /> On May 8, 2007,monitoring wells MW1 through MW5 were'moiutored and sampled Groundwater <br /> elevations were calculated by measuring the depth to groundwater,in,each well and subtracting from <br /> the respective wellhead elevation,. Groundwater elevations at the site fell by an average of.0.01 feet <br /> since Last monitored on.February 22, 2007. Groundwater flow was .generally toward the northeast, <br /> with . components of northerly and northwesterly. `flow; at a hydraulic gradient averaging <br /> approximately 0.002 ft/ft. A potentiometric surface"map created from the May 8, 2007 monitoring <br /> data is depicted on Figure 2. .Groundwater elevation data are summarized in.Table 1. .Monitming <br /> data sheets are included in Attachment A. <br /> GaGROUNDZE;WOOLSEY.CH7lQMRt2007LQM2007.doc er <br />