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�r�r1 <br /> GEOMATRIX <br /> 6.0 DESTROYING SOIL, BORINGS <br /> Soil borings that are not completed as monitoring wells will be destroyed by filling the <br /> ., holes with a neat cement grout, cement/sand grout, or cement/bentonite.grout. A high- <br /> solids bentonite grout may be used in the.saturated zone. Geomatrix field staff will <br /> calculate borehole volume and cornpare it to the volume of grout used to evaluate. whether <br /> r bridging has occurred. These calculations and-the actual volume emplaced will be noted on <br /> + the boring log. The grout will-be placed in one continuous pour before its initial set from <br /> the bottom of the boring to ground surface. The grout will be emplaced by pumping <br /> througha. tremie pipe or flexible hose initially lowered to the bottom of the borings and <br /> raised incrementally as placement proceeds. If hollow stem augers were used for drilling, <br /> --the augers should be raised in.incrementally as emplacement proceeds. Augers will not be <br /> raised in increments greater than 20 feet or as greater than allowed.by borehole stability. <br /> Bonng s that are terminated above the water table and not greater than 20-feet deep may be <br /> abandoned by a continuous grout pour originating at the ground surface. The-grout will be <br /> pumped until a return of fresh grout is visible at the surface. <br /> �x <br /> DRILLING AND DESTRUC'T'ION OF SOIL BORINGS <br /> S/SC\GEOMATIMPRO REVISION DATE: NOVEMBER 1992 Page 6 of 6 <br />