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SAND BACKFILL <br /> * PVC THREADED PLUG <br /> ! i <br /> i <br /> 3"-INCH PVC SECTION <br /> 3"-INCH PVC PLUG <br /> 3-INCH PVC"r COUPLING <br /> GROUND SURFACE <br /> CONCRETE SLAB „ <br /> 4 4 <br /> PROTECTIVE COVER AT GRADE <br /> CEMENT SEAL <br /> r <br /> BENTONITE PELLET SEAL(3- <br /> 3-INCH BLANK PVC CASING-FLUSH THREADED SCHEDULE 40 <br /> HOLLOW STEM AUGER BOREHOLE(8-INCH) <br /> 3-INCH SLOTTED PVC CASING--FLUSH <br /> THREADED SCHEDULE 40 <br /> CLEAN IMPORTED SAND <br /> PVC BOTTOM PLUG <br /> NOT TO SCALE <br /> Figure 1. Section View of Typical Preliminary Vapor'Well <br /> Construction . <br />