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' 6.0 DESTROYING SOIL BORINGS GEOMATRIX <br /> ' Soil borings that are not completed as monitoring wells will be destroyed by filling the holes <br /> with a neat cement grout, cement/sand grout, or cement/bentonite grout. A high-solids <br /> bentonite grout may be used if appropriate. Geomatrix field staff will calculate the borehole <br /> ' volume and compare it to the volume of grout used to evaluate whether bridging has occurred. <br /> These calculations and the actual volume emplaced will be noted on the BORING LOG. The <br /> ' grout will be placed in continuous lifts from the bottom of the boring to a depth of 20 feet <br /> above the water table. The grout will be emplaced by pumping it through the hollow stem <br /> augers, drill pipe, tremie pipe, or flexible hose initially lowered to the bottom of the borings <br /> and raised incrementally as placement proceeds. If hollow stem augers are used, the augers <br /> should be raised incrementally as grout emplacement proceeds. Augers will not be raised in <br /> increments greater than 20 feet or greater than allowed by borehole stability. Borings that are <br /> ' terminated above the water table and not greater than 20 feet deep may be destroyed by <br /> ' continuous lifts originating at the ground surface. The grout will be pumped or poured until a <br /> return of fresh grout is visible at the surface. Additional grout may need to be added to the <br /> soil boring if significant settlement has occurred after the grout has set. <br /> ' Attachments: Daily Field Record <br /> Boring Log <br /> Well Log <br /> DRILLING AND DESTRUCTION OF SOIL BORINGS ?age 5 or 5 <br /> SISC'.?ROTO-DD.I'::T REVISION DATE: MARCH 1996 DD-O <br />