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The coal stockpile dam is an existing structure and is <br />located slightly west of the truck dump station. The <br />sediment volume and 10 -year, 24-hour inflow <br />calculations are presented in Exhibit 8 Protection of the <br />Hydrologic Balance. The sediment volume is 0.16 <br />acre-feet and the 10 -year, 24-hour inflow is 0.19 acre- <br />feet. The total volume required is 0.16 acre-feet + 0.19 <br />acre-feet = 0.35 acre-feet. <br />The runoff/sedimentation storage areas will be de - <br />watered with a pump. The de -watering will be after a <br />runoff detention time of 24 hours, and will be done in <br />such a manner as to minimize disturbance to the <br />surrounding areas. <br />The ponds will be removed following usage with the <br />approval of the DRMS. They will be adequately <br />backfilled and riprapped. Currently plans are to <br />remove the dam, backfill the pond, and restore natural <br />drainage. <br />(C) See Exhibit 8 <br />(D) There has been no past underground mining in the <br />area of either pond. <br />(E) No response required. <br />(i) Design Plans <br />The maps, plans and cross sections for the loadout and <br />stockpile ponds were prepared by or under the direction of and <br />certified by Matthew Sakurada, P.E., a qualified professional <br />engineer with engineering experience in the design and <br />construction of sedimentation ponds, excess spoil and <br />underground development waste facilities. <br />RN -07 2.05-19 02/18 <br />