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i <br />�4 <br /> WATER PROOF WELL BOX <br /> GROUND LEVEL -- <br /> LOCKING WELL CAP I <br /> y <br /> E <br /> e <br /> WELL CASING <br /> 13 or 23 FT. <br /> i <br /> r f r <br /> CEMENT SEAL <br /> s: <br /> r s <br /> i <br /> f r r <br /> 2 FT BENTONITE SEAL <br /> 2 FT. <br /> FILTER PACK <br /> i — <br /> i - <br /> 20 FT, <br /> WELL SCREEN <br /> B❑RING WALL <br /> LVF ..... <br /> NOT TO SCALEEND CAP <br /> FIGURE 4 <br /> PROP❑SED VAPOR EXTRACTION WELL CONSTRUCTION DETAIL <br /> G , <br /> it 1 <br />