Laserfiche WebLink
4.05.5 Sediment Control Measures <br />Sediment control measures to be implemented are shown in Exhibit <br />• 11. These facilities, consisting primarily of collection ditches <br />and a sedimentation pond, will be located, constructed, and <br />maintained to avoid erosion and increased contribution of sedi- <br />ment load to run-off. Discussion on sediment and drainage con- <br />trol is presented in Exhibit 11. <br />If encountered during the underground operation, water will be <br />treated in underground sump areas prior to discharge. Presently, <br />the mine is dry and it is expected to stay dry. <br />The Bear Coal Company plans to disturb only the amount of area <br />necessary for the surface facilities. Although the primary means <br />of sediment control are collection ditches and a sedimentation <br />pond, the Bear Coal Comgany will utilize, as necessary, straw <br />dikes, riprap, check dams, mulches, vegetative sediment filters, <br />dugout ponds, or other measures that reduce overland flow veloci- <br />ty or run-off volume. <br />The access road from the highway at Somerset to the bridge across <br />the North Fork of the Gunnison cannot be drained into a sediment <br />pond. This area, less than 0.5 acres, is classified as a small <br />area exemption. Alternate sediment control measures are used to <br />treat the run-off from this road. Discussion of this small area <br />expemtion is presented in Exhibit 11. <br />• 4.05.6 Sedimentation Ponds <br />The location of the sedimentation pond is shown in Exhibit 11. <br />The design plans and specifications for the sedimentation pond <br />are also presented in Exhibit 11. The sedimentation pond was <br />located as close as practical to the area being disturbed by <br />surface facilities. <br />• 4.05-5 <br />Revised June 29, 1990 <br />