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The North Decline dewatering pipe drill was constructed as shown on <br />Figure 14 -8. Design for alternative sediment control utilized is presented <br />in Appendix 14 -6 beginning on page 14 -6 -74. Available topsoil was <br />salvaged. The drill pad development was virtually all cut. Therefore, a <br />temporary spoil pile with a capacity of approximately 2,000 cubic yards <br />was required. Topsoil and spoil were placed in stockpiles located at the <br />North Decline reclaimed is the area shown on Figure 14 -8. Topsoil from <br />the footprint of the spoil pile was placed in the topsoil stockpile. The drill <br />pad was be reclaimed as soon as the dewatering pipe was operational. <br />The reclaimed area along with the area disturbed in the North Decline was <br />seeded and mulched according to the reclamation plan presented above <br />in this tab section. <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 <br />and placing a cement plug in the top of the hole from 10 feet down to <br />within three (3) feet of the ground surface. The typical section of a sealed <br />drill hole is shown in Figure 14 -3. Piezometers, soil sample holes, and <br />other holes drilled into fill material, alluvial material, or near surface <br />geologic formations where the potential for adverse environmental, health, <br />or safety effect is minimal will be filled with cuttings or soil. Piezometer <br />pipes will be cut off a minimum of one foot below grade and a PVC gap <br />glued on the pipe. <br />If a hole is completed in an aquifer, it will be sealed by placing an <br />approved cement or sealant in the hole from the bottom to within 10 feet <br />of the ground surface. A cement plug will be placed in the upper 10 feet. <br />Each hole will be marked for identification. <br />TR -63 14 -31 (Rev. 11/12) <br />