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• <br />• <br />• <br />Sealing of drilled holes exploration drill holes, boreholes, or wells not <br />completed in an aquifer but which could have adverse environmental, <br />health or safety effects shall be sealed by replacing cuttings in the hole and <br />placing a cement plug in the top of the: hole from 10 feet down to within <br />three (3) feet of the ground surface. T'he typical section of a sealed drill <br />hole is shown in Figure 14-3. Piezometers, soil sample holes, and other <br />holes drilled into fill material, alluvial material, or near surface geologic <br />formations where the potential for adverse environmental, health, or safety <br />effect is minimal will be filled with cuttings or soil. Piezometer pipes will <br />be cut off a minimum of one foot below grade and a PVC gap glued on the <br />pipe. <br />If a hole is completed in an aquifer, it will be sealed by placing an approved <br />cement or sealant in the hole from the bottom to within 10 feet of the <br />ground surface. A cement plug will b~; placed in the upper 10 feet. Each <br />hole will be marked for identification. <br />14-3 l <br />(Rev. 3/01/00) <br />