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H. Filling for the remaining height to reach approximately 50 feet will continue without undue <br />delay, but will not be done 24 hours per day. <br />I. At times when no one is working to fill the shaft, the shaft edge will be adequately fenced or <br />protected and posted with conspicuous signs prohibiting the entrance of unauthorized persons. <br />6. 16 -foot diameter Elk Creek Intake Shaft, Concrete Cap <br />A_ The first ring beam is approximately 1.5 feet below the shaft collar and the second ring beam <br />is approximately 4.5 feet below the shaft collar. In order to create a substantial concrete plug, <br />the second ring beam will be used as a base. <br />B. During form construction, a pipe or hose will be lowered into the shaft, providing a small <br />amount of compressed air to ventilate and create movement to clear any methane leakage <br />coming from the mine workings. <br />C. Four steel beams, W8 x 24, will be lowered and set in place on top of the second ring beam. <br />These W -beams will be set parallel and approximately 3.5 feet apart. Their length will vary so <br />that they span the shaft opening. See attached drawing for details. <br />D. 3" corrugated steel Q -decking will be set in place over the beams and the perimeter will be <br />foamed in order to contain the concrete, once poured. If personnel are required to enter the <br />shaft to complete work, they shall be tied off at all times to prevent falling. <br />E. A mat of #9 rebar on 6" x 6" spacing will be placed about 4 inches above the Q -decking. <br />F. A second mat of #9 rebar on 6" x 6" spacing will be placed on top of the first ring beam. <br />G. A vent pipe, minimum 2" diameter, HDPE material, shall be set in place prior to pouring any <br />concrete. The vent pipe shall extend a minimum of 15 feet above the final designed grade and <br />shall be secured as necessary to prevent tipping. <br />H. No cutting or welding will be performed directly over the shaft. <br />1. 3000 psi concrete shall be poured in place. A slight grade will be put on the finished concrete <br />to drain water off the plug. <br />J. During construction, the shaft opening will be protected by a substantial barrier as feasible. <br />All personnel working around the shaft collar will utilize harnesses and be tied off to prevent <br />falling. <br />7. 16 -foot diameter Elk Creek Return Shaft, Concrete Cap <br />A. The first ring beam is approximately one foot below the shaft collar and the second ring beam <br />is approximately five feet below the shaft collar. In order to create a substantial concrete plug, <br />the second ring beam will be used as a base. <br />B. During form construction, a pipe or hose will be lowered into the shaft, providing a small <br />amount of compressed air to ventilate and create movement to clear any methane leakage <br />coming from the mine workings. <br />C. Four steel beams, W8 x 24, will be lowered and set in place on top of the second ring beam. <br />These W -beams will be set parallel and approximately 3.5 feet apart. Their length will vary so <br />that they span the shaft opening. See attached drawing for details. <br />D. 3" corrugated steel Q -decking will be set in place over the beams and the perimeter will be <br />foamed in order to contain the concrete, once poured. If personnel are required to enter the <br />shaft to complete work, they shall be tied off at all times to prevent falling. <br />E. A mat of #9 rebar on 6" x 6" spacing will be placed about 4 inches above the Q -decking. <br />F. A second mat of #9 rebar on 6" x 6" spacing will be placed on top of the first ring beam. <br />G. A vent pipe, minimum 2" diameter, HDPE material, shall be set in place prior to pouring any <br />concrete. The vent pipe shall extend a minimum of 15 feet above the final designed grade and <br />shall be secured as necessary to prevent tipping. <br />H. No cutting or welding will be performed directly over the shaft. <br />4 <br />