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WAW <br /> GEOMATAIX <br /> r <br /> Alternatively, well casing materials that have been steam-cleaned and sealed in individual <br /> airtight plastic bags by the factory can be used. <br /> Decontamination rinsate will be collected and stored for future disposal by the client in <br /> accordance with legal requirements. <br /> r <br /> 4.0 WELL DESTRUCTION <br /> aw <br /> Destruction of wells will be completed in accordance with applicable state and local <br /> 6 <br /> -0 requirements. If required, permits for destruction will be obtained from the appropriate <br /> regulatory agency. As part of destruction design and implementation, care will be taken to <br /> a' seal groundwater pathways between multiple aquifers, and limit surface water infiltration <br /> through the destroyed borehole. <br /> If possible, the well casing will be removed from the borehole. For shallow wells, and if <br /> the well has been completed in the uppermost aquifer, the casing may be pulled from the <br /> borehole before auger entry. Alternatively, and if the well has been completed below the <br /> uppermost aquifer, the annular fill may be drilled out with hollow-stem augers and the <br /> casing removed from the borehole through the augers. If the well casing is PVC or other <br /> Y.r <br /> similar material and cannot be removed as described above, it may be removed by drilling <br /> out the casing and annular fill using a tricone or drag bit and a rotary drilling method. The <br /> borehole will be redrilled to the same or slightly larger diameter than the original borehole. <br /> The redrilled borehole will be plumb and adequately centered, and all the well casing will <br /> be removed. The borehole will be filled with a neat cement, cement/sand or <br /> cement/bentonite grout. A high-solids bentonite grout may be used in the saturated zone. <br /> The grout will be placed in one continuous pour before its initial set from the bottom of the <br /> boring to the ground surface. The grout will be emplaced by pumping through a tremie <br /> pipe or flexible hose which is initially lowered to the bottom of the borehole. and raised <br /> aaw incrementally as emplacement proceeds. The augers should be raised incrementally as <br /> emplacement proceeds, but not to exceed increments of 20 feet or greater than allowed by <br /> am <br /> INSTALLATION AND DESTRUCTION OF WELLS <br /> MS4MGEOMATRX.PRO REVISION DATE:NOVEMBER 1992 Page 7 of 8 <br /> r <br />