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Fish Creek Ventilation Borehole - An SAE exists at the Fish Creek Ventilation Borehole. A vegetative filter will provide sediment control for the 0.6 acre azea of disturbance. Until the vegetation becomes reestablished, however, • the 0.06 acre-feet of runoff from the 10-yeaz, 24-hour event will flow to the collection ditch around the Fish Creek Borehole ponds, where it will be controlled and treated by the gravel filters in the ditch. This SAE is shown on Map 26, Fish Creek Borehole Area Facilities and Access Pond. Former CYCC Office Buildine Facilities Area ('1'R-05-461 Sediment control for the CYCC Office Building facilities azea (includes building, parking areas, and associated roads) was previously addressed under Permit C-81-071. As a historic disturbance within the present Pemut Area, TCC maintains and is responsible for fmal reclamation of this azea. Soil materials for fmal reclamation of this azea aze stockpiled as indicated by Map 29, Reclamation. Given that the calculated 10-yeaz, 24-hour storm runoff for the CYCC Office Building facilities azea is only approximately 0.01 af, drainage and sediment control requirements for this azea aze limited. Drainage and sediment control for this azea aze effectively addressed by a Small Area Exemption, as shown on Map 24, Surface Facilities, and the following Alternative Sediment Control components; 1) Asphalt-surfacing of the pazking areas; 2)A well- established vegetative filter on the down-gradient outslope; and 3) Roadside drainage ditches and the associated rock check dams on both sides of the access road connecting the facilities area with Haulroad C. Sandstones Power Substation -Sediment Control for this area (less than one acre) will consist of a perimeter containment berm/temporary diversion ditch and gravel filter(s) sufficient to treat the estimated 0.06 acre-feet of runoff from the 10-year, 24-hour event. The location of this SAE is shown on Map 39 (Substation and Powerline Location). This SAE was expanded slightly in Fall 1993 to allow the drilling of a replacement borehole into the mine, which was in turn, used for drilling of a water supply/monitoring well underground (FCM No. 2). The expansion of the SAE entails extension of the berm to the west to encompass the very limited (approximately 50 x . 50 feet) of additional disturbance. Any topsoil stripped will be windrowed/temporarily stockpiled adjacent to the pad. Following completion of the well work, a portion of the expanded azea may be reclaimed, with remaining topsoil being added to the existing topsoil stockpile. The topsoil and reclaimed azea will be seeded and stabilized using the pastureland see mixture. Railroad Snur Extension Area -This SAE covers 2.75 acres and is located west of Pinnacle Peak, adjacent to the raih-oad embankment. A portion of this SAE azea is a seeded topsoil stockpile. All water drains to the south and is filtered through a silt fence located west of the rail spur extension. The azea below the silt fence is vegetated and serves as a vegetative filter. Peak flow from this small area is approximately 4.4 cfs, as previously approved in the original submittal under the C-81-071 permit. Warehouse/Shoo Area -This SAE covers approximately 5.88 acres and is located on anorth-facing slope below the shops. Water (approximately 0.15 acre-feet from the 10-yeaz, 24-hour event) drains through established vegetation, gathers along the railroad track embankment and runs along Ditch F-2 toward the culvert under the light-use road adjacent to Pond F. The water collects in a natwal depression on the upper end of the culvert before flowing through the culvert. Once through the culvert, drainage flows down the north side of Pond F and the light- use road/railroad embaril~nent. The area is vegetated and serves as a vegetative filter to inhibit and filter flows. A rock check dam, previously established in this azea, acts as a Final filter and flow control for drainage before it leaves the azea. Stoker Coal Loadout - The Stoker Coal Loadout, which covers 1.8 acres, is located north of the Old Equipment Parking Lot and adjacent to the railroad tracks. Sediment control in the area consists of a berm and rock filter located on the west side of the bench, and a rock filter on the north side of the railroad track. These control any potential surface runoff from the bench area. Warehouse Area No. 2 -This SAE consists of approximately 1.5 acres located between the Stoker Pad and the WazehouselShop SAE's. There is little or no drainage from the flat, graveled area, and any flow from the area would be controlled and treated by either the Stoker Pad silt fence or the wazehouse exemption rock check dam. MROS-194 2.05-80 07/2/05