2016-12-05_HYDROLOGY - C1981035 - Laserfiche WebLink

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Storm Water Management Plan (SWMP), September 2012 GCC Energy – King Coal & King II Mines 3 stormwater discharge Outfall 3 and the drainage system to Hay Gulch. Coal processing and industrial activities occur in Areas B, C and D. Drainage from undisturbed areas is routed around the surface facilities and activities occurring in Areas B, C and D. These drainage areas and systems are further described below. Area A: Drainage Area A consists of the southern portion of the facility, and is primarily used for drainage and access to the facility. This area is shown in detail on Figure 2 in Attachment B. The 225,000 cubic foot sediment pond is the northern-most feature of this area. A one- acre topsoil stockpile, which has been re-seeded and stabilized, is located south of the pond, on the east side of the road. The sediment pond collects all on-site drainage from industrial operations within the mine’s boundaries. If the pond ever reaches capacity, it is equipped with two emergency outlet pipes which allow water to discharge from the upper surface of the pond, via Outfall 003. The outlet from the pond is lined with geotextile fabric and armored with riprap. The outlet settlement trap drains into the convergence area of the eastern and western boundary clearwater ditches, which follows a natural drainage on the east side of the road into Hay Gulch. Area B: Offices and Employee Parking Office and storage trailers, the scale house and truck scales, employee restrooms, employee parking, and a septic system are located in Area B. The area is defined by the truck loop, which is the access to load coal into semi-trucks. This area is shown in detail on Figure 3 in Attachment B. Drainage from this area is directed to a culvert which crosses under the south side of the loop road, and drains into the sediment pond. Drainage from the road on the west side is directed to a culvert which crosses the road near the southwest corner of the loop, and then into the culvert on the south side and into the sedimentation pond. Area C: Coal Processing The facility’s coal processing activities occur within the area designated Area C. This area is shown in detail on Figure 4 in Attachment B. Coal processing activities include: coal crushing/screening, coal transport via conveyor belts, and coal storage piles. Drainage in this area is directed via drainage ditches and grading to three drop inlets which drain directly into the sediment pond, or into a culvert that crosses under the road and into a ditch that crosses through Area B and into the sediment pond. Area D: Material Storage and Maintenance Fuel, lubricants, additives, and parts are stored within Area D. This area is shown in detail on Figure 5 in Attachment B.