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FIGURE 2 - EXTRACTON WELL SCHEMATIC <br /> Extraction Wells EW-2, EW-3, and EW-4 <br /> Well Vault <br /> Surface — <br /> /double containment <br /> Water <br /> Air <br /> 2-ft.bgs -- <br /> Well Boring (12-inch diameter) <br /> Casing (4.5-in. diameter) <br /> Cement Seal <br /> Bentonite Seal ( 1 bucket pellets) <br /> 8-ft.bgs <br /> 10-ft.bgs <br /> Sand Pack <br /> Screen (020 in.) <br /> 25-ft.bgs Pump - 1-5 gpm <br /> Bentonite Seal ( 1 bucket pellets) <br /> 30-ft.bgs <br />