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• COMPLETION OF AMW-2 <br />Ground-Water Monitor Well AMW-2 Installation <br />1) The boring was advance using 13.6-inch outside diameter hollow-stem auger. <br />2) Six-inch diameter, flush joint, thread-coupled, Schedule-40 PVC pipe was <br />placed to the total depth of the boring inside the hollow stem auger. The <br />bottom 12 feet of pipe consisted of 0.02 inch factory-slotted PVC screen and a <br />2 foot silt trap. <br />3) The annular space around the pipe was backfilled through the hollow-stem <br />auger from the bottom to approximately 3 feet above the screened interval with <br />pea gravel. <br />4) A 3-foot bentonite seal was placed above the sand pack to isolate the zone of <br />interest from infiltration. <br />5) A cement grout was placed from top of the bentonite seal to the ground <br />surface. <br />6) A steel protective cover was installed over the well to protect it from damage. <br />• <br />ABANDONMENT OF OLD AMW-2 <br />Cement grout was pumped down the 4 1/2" casing annulus to the surface. The <br />casing was cut off three (3) feet below the surface, capped, and back filled. The <br />slurry mixture was pumped by dropping the pump hose down the annulus and <br />raising the hose as the space filled to eliminate air pockets and promote settling. <br />• <br />57c 4/93 <br />