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GROUND ZERO ANALYSIS,INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-9883 <br /> i <br /> September 24, 2007 • n � �r HIM <br /> Mr. Michael Infurna S E P 2 5 2007 <br /> San Joaquin County <br /> Environmental Health Department ENVIRONPv Bi I HEALTH <br /> 304 E. Weber Ave., Third Floor PERMIT/,SERVICES <br /> Stockton, CA 95202 <br /> Subject: Third Quarter 2007 Groundwater 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 2007 groundwater monitoring and sampling <br /> activities at the subject site (Figure 1). I <br /> I QUARTERLY GROUNDWATER SAMPLING ACTIVITIES <br /> r <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 i <br /> On August 28, 2007, 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 decreased by <br /> an average of 1.38 feet.since last monitored on May 8, 2007. ,Groundwater flow was generally <br /> toward the northeast, with components of northerly and northwesterly flow, at a hydraulic gradient i <br /> averaging approximately 0.003 ft/ft. A potentiometric surface map created from the August 28, <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 />+� G:\GROUNDZE\WOOLSEY.CHT\QMR\2007\3QM2007.doc <br /> 1 � <br />