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a� M <br /> T <br /> R. <br /> °1Four soil borings were drilled in the area of the fuel <br /> = lines. <br /> ° Soil samples were collected from the bottom and sides <br /> of the fuel storage tank excavation and analyzed for <br /> volatile hydrocarbons, EDB (ethylene dibromide), and <br /> - f <br /> lead. <br /> ° One soil sample was collected from the bottom of the <br /> waste oil tank excavation and analyzed for oil and <br /> grease content and pcbs (polychiorinated biphenols) . <br /> HYDROGEOLOGIC SETTING <br /> The Exxon Service Station site is located in the northern <br /> .' portion of Stockton. The topography in the vicinity of the site <br /> is` relatively low lying and level with only a ve.i•y gentle slope ; <br /> .s to the southwest. The local groundwater table appears to be <br /> very flat. Five Mile Creek, (a slow moving, low volume, channeled <br /> )` creek), flows past the southeast side of the :site and then runs <br /> t <br /> to thesouthwest, emptying into Fourteen Mile Slough. Mosher <br /> # .: Slough is a channeled waterway located a half mile north.of the . <br /> site which flaws in a east to west directf:or. (See. Figure 1) . The <br /> =r } Exxon property lies approximately 12 feet .above mean sea level. <br /> € Depth to groundwater at the site was measured approximately 46 ' <br /> F feet below grade. <br /> s MONITORING WELL INSTALLATION <br /> Two groundwater monitoring wells were installed at the Exxon <br /> Service Station on January 8 and .3, 1986. Thelocations of the <br /> k ' V wells are shown on Figure 2: The wells were drilled to a depth <br /> i <br /> of 70 feet. : This satisfies the San Joaquin Local Health District <br /> guidelines-.which require that monitoring wells extend 20 feet <br /> F l 3 <br />