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7-11/Stockton 3 <br /> June 1929 <br /> screen. Two monitoring wells will be located off site to the <br /> - north and to the northwest on the property located at 9160 <br /> Thornton Road. One well cluster will be located off site to the <br /> east, on the south side of Waudman Avenue downgradient from the <br /> underground tanks. The second well cluster will be installed on <br /> site near the underground tanks. The well clusters will be in- <br /> stalled to determine the vertical extent of the contaminant plume <br /> at the s 'te, and downgradient of the site. In addition, they <br /> will be useful in determining vertical hydraulic gradients and <br /> conductivities. Proposed well locations are shown on Figure 2. <br /> The proposed monitoring well B1, shown on the attached well <br /> location map (Figure 2) , will be drilled first. Subsequently, it <br /> will be developed and sampled for hydrocarbon cr,ntamination. <br /> Based on the results from this sampling, proposed monitoring well <br /> W B2 may be relocated within the same property boundaries. If such <br /> activities become necessary, Southland along with the appropriate <br /> regulatory agencies will be notified of the new well location <br /> prior to installation. <br /> ` BACKGROUND <br /> In April 1986, the Southland Corporation retained GTI to <br /> conduct a subsurface investigation of a suspected gasoline <br /> release at the 7-Eleven site at 9110 Thornton Road in the City of <br /> i5. <br /> Stockton. Subsequent to the initial investigation, which found <br /> subsurface contamination, both a groundwater and recovery/ <br /> treatment system and a soil-vent system were installed. These <br /> systems are currently in operation to recover and treat the <br /> -- dissolved- and free-product petroleum hydrocarbon phases in the <br /> groundwater and the adsorbed phase in the soils at the site. <br /> �J l:xn�xinti:�rt:k <br /> TrCl�Xui.ncl.Nc <br />