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A non-clogging, dewatering device will be located at a lower <br />elevation on a maximum sediment storage volume. Dewatering will <br />• be achieved as necessary to comply with applicable state laws <br />and regulations. <br />Sediment will be periodically removed from the sedimentation <br />pond. The pond will be cleaned out when water levels are lowest, <br />and the least amount of precipitation is expected. The removed <br />sediment will be disposed of at the Somerset Mine, Elk Creek <br />Facilities, gob disposal area. <br />The detention time for the sedimentation pond has been designed <br />to be a minimum of 24 hours to meet the applicable effluent <br />limitations with respect to total suspended solids. <br />The pond will be constructed so <br />of the settled embankment is at <br />tion of the surface water in the <br />is flowing at design depth. <br />the minimum elevation at the top <br />least one foot above the eleva- <br />pond when the emergency spillway <br />The Bear Coal Company has designed and will construct and main- <br />tain the sedimentation pond to prevent short-circuiting. As a <br />general rule, the inflow to the pond will be at the opposite end <br />from the outflow area. <br />The sedimentation pond embankment will be less than 10 feet in <br />vertical height from the toe of the centerline to the embankment <br />• to the invert~of the spillway. <br />To allow for settling, the constructed height of the sedimenta- <br />tion embankment will be at least 5 percent greater than the <br />designed height. <br />• 4.05-6R <br />Revised June 29, 1990 <br />