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Surface Facilities Area <br />• The sedimentation control structures associated with the portal area, Map 24, Surface Facilities, <br />have been constructed in accordance with previously approved permits (CYCC Permit No. 79- <br />]77 and TCC Permit No. C-82-056). These structures include the following: 1) Pond B, 2) <br />Pond C, 3) Pond D, 4) Pond E, 5) Pond F, <br />6) Pond G, 7) Pond T and their associated drainage ditches. <br />Sediment B treats runoff from Tipple 2, Belt Out Back, and adjacent areas. Sediment Pond C <br />treats runoff from the old loadout area and adjacent areas and wash down water from the from the <br />batch loadout. Sediment Pond T treats runoff from the magazine and storage yard area. <br />An aerator was installed in Pond D to promote aerobic conditions throughout the year. There is <br />an existing power line and power box on the west side of the pond. The aerator and power supply <br />will be removed prior to reclamation of the pond. <br />All of the above sedimentation control structures have been addressed under Rule 2.05.6 below <br />with the exception of surface drainage modifications associated with the new coal handling <br />facilities. Drainage from these Facilities will be channeled to Pond D, Pond E, Pond F, and Pond <br />G as shown on Map 24, Surface Facilities. Diversion ditch and culvert designs are included in <br />Exhibit 8, Sediment Control Plan. <br />In order to provide for better drainage from the west ramp of the portal, the system has been <br />modified. The two culverts that carry water from the west ramp will be plugged, and the water <br />will be diverted toward the Wadge sump. These culverts have been deleted from Map 24, but <br />• still exist in the field. Water will course to a small sediment dam which holds a 4" overflow pipe. <br />Once the water reaches the top of the sediment dam, the water will enter the 4" overflow pipe and <br />then drain to the sump. This system will aid in settling out some sediment from the water before <br />it reaches the Wadge sump. From the sump, the water will be pumped up into Ditch D-2. <br />SMALL AREA EXEMPTIONS <br />Twentymile Coal Company has been granted a few small area exemptions within the permit area. <br />Sedimentation control in these areas will be accomplished by a variety of methods, such as <br />vegetative filters, installation of fabric filter fences, rock check dams, gravel filters or berms. <br />Rockdust Tank <br />A small exemption area for sedimentation convol has been granted for the rockdust tank and <br />truck access/unloading area. The total disturbance will be approximately .5 acres. Of that <br />amount, .3 acres will be filled with pit run gravel, which acts as an infiltration screen for any <br />overland flow associated with the rockdust tank and access/unloading area. Estimated peak flow <br />from the area for the 10 year-24 hour event is some 0.04 acre-feet. Runoff from the topsoil pile is <br />controlled by a berm/swale/rock filter system. In addition to the infiltration screen, flow from the <br />tank and unloading area is conveyed by means of swales and berms to a gravel filter. These, in <br />conjunction with existing vegetation will be sufficient to control runoff from the area as observed <br />during previous inspections. <br /> <br />~1t~1Pdt~~ED JUN 2 0 2000 <br />PR 99-OS 2.05-79 3/28/00 <br />