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measurements will be confirmed using gasoline and water indicator pastes and a <br /> clear acrylic bailer to visually examine water at the interface. <br /> R <br /> Wells at Concrete Perimeter <br /> At least ea t three wells will be installed just outside the concrete perimeter <br /> ��. to assess the presence of free oil on the water table. The approximate loca- <br /> tions of these wells are shown on Plate 2. These well locations could change <br /> depending upon the results of the probing to locate the concrete perimeter. <br /> These wells should indicate the degree to which oils from the reservoir and the <br /> sump have accumulated in the immediately surrounding groundwater. After <br /> installation and development, the thickness of floating product will be measured <br /> with an interface probe, gasoline and water indicator pastes , and a clear <br /> acrylic bailer. These measurements will be used in conjunction with data from <br /> the first three wells to assess the need for additional perimeter wells and to <br /> guide the location of step-out wells. <br /> Step-out Wells <br /> If free oil is observed in the wells at the slab perimeter, step- <br /> out wells <br /> will be installed at locations where access permits. The thickness of product, <br /> at the perimeter, along with available access, will be used to guide the selec- <br /> tion of step-out spacings. Step-out wells will be placed to define the lateral <br /> and down-gradient extent of floating free oil. <br /> DISSOLVED HYDROCARBONS <br /> Purpose <br /> The purpose of this task hydro- <br /> carbons <br /> a is to assess the concentration of dissolved hydro <br /> carbons just outside the free oil plume, if such a plume is present. A dis- <br /> solved hydrocarbons plume, if present, should extend laterally beyond and <br /> down-gradient of the free oil plume. Accordingly, once the location of the free <br /> a oil plume has been established, three wells will be installed just outside its <br /> boundary. It should be noted that the purpose of these wells is not to find the <br /> limit of the dissolved plume, but only to sample water near the free oil plume <br /> to indicate the extent to which dissolved constituents may have entered the <br /> JED2/H -ll- <br />