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u <br /> Mal <br /> 3 <br /> 7-11/stockton <br /> April 1989 <br /> on the property located at 91.60 Thornton Road. One well nest <br /> he property located on <br /> will he located off site to the east on the <br /> the still ide °: PFWaus <br /> ,d ,,-"""Xvenu+ downgradient,; rami' he <br /> an <br /> . ,r ragkr3st <br /> uergrouna"tanks: The second well nest will be installed on <br /> site near the underground tanks. The well nests will be <br /> installed to determine the vetical,>extet►t of the c�intaminant� <br /> plus °''a `the s3' e, and �iosangradierlt..'f the"site.' In addition, <br /> they will be useful in determining vertical hydraulic gradients. <br /> Proposed well locations are shown on Figure z. <br /> go <br /> The proposed monitoring well B1, shown on the attached well <br /> location map (Figure 2) , will be drilled first. Subsequently, it <br /> rocarbon contamination. <br /> will be developed and sampled for hyd <br /> Based on the results from this sampling proposed monitoring well <br /> B2 may be relocated within the same property boundar:ies• xh <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 /> -Eleven s:�te at 9110 Thornton Road in the City of <br /> release at the 7 <br /> Stockton. Subsequent to the initial investigation, which found <br /> both a groundwater a recovery/treatment <br /> subsurface contamination, <br /> nstalled. These systems are <br /> system and a soil-vent system were i <br /> currently in operation to recover and trhe eat <br /> free-product petroleum hydrocarbon phasesinthegroundwaterand <br /> the adsorbed phase in the soils at the site. <br /> t ' <br /> LL GRoL1N[)%V'%TEH <br /> .;' 'f F.CiIkOEI?G5'.INC. <br /> 4 <br />