2008-09-16_PERMIT FILE - C1982056A (4)

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Railroad Spur Extension Area -This SAE covers 2.75 acres and is located west of Pinnacle Peak, adjacent to the railroad embankment. A portion of this SAE area 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 area 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. Storage and Training Area (Trudv's Corner - TROS-45) - An area located east of Pinnacle Peak and northeast of Pond A previously disturbed and used in conjunction with historic surface mining activities (Trudy's Corner), is currently utilized as a materials storage and training area. This area encompasses approximately 0.78 acres. Drainage from this area flows to the west to an existing drainage ditch along the Pond A access road, then approximately 0.15 miles through the vegetated ditch and awell-established vegetative filter to Pond A. An SAE demonstration documenting the effectiveness of this drainage configuration for the Storage and Training Area is provided in Exhibit 8U. Pond B Access Pad -This SAE covers about 0.3 acres adjacent to Pond B. The area is gently sloping, with heavy vegetative cover on adjacent areas bordering Foidel Creek, acting as a filter to prevent sediment contributions to the stream. CYCC constructed a berm and rock filter to further control and treat the anticipated 0.01 acre-feet of runoff, generated by the 10-year, 24-hour event. Tipple No. 2 Loadout Tunnel -The Tipple Loadout Tunnel SAE consists of small disturbed area surrounding the tunnel on the east side as identified on Permit Renewal Map 5 (Roads, Powerlines and Facilities). The surrounding area is well-vegetated and rock/gravel filter dams have been installed in the ditches along the railroad track. This SAE was approved by the CMLRD on June 23, 1988 with MR 88-27. Runoff from from a 10-year, 24-hour event for this 0.10 acre exemption area would be negligible. Scoria Storage Area (TR05-45) - A portion of the former Haul Road A northwest of Pond C is used as a storage area for the scoria and gravel materials used in maintaining mine roads. The Scoria Storage area covers approximately 0.87 • acres. The surface of this area is graded so that most minor drainage is naturally contained. Runoff from any significant storm event drains to the south and east, where an existing berm routes runoff flows to a sump and collection ditch designed to treat the runoff from a 10-year, 24-hour storm event. From this ASC, the ditch directs drainage flows through awell-established vegetative filter to Foidel Creek. The SAE demonstration for the Scoria Storage Area is provided in Exhibit 8U. Haulroad C Topsoil Pile -The Haulroad C Topsoil Stockpile SAE covers approximately 0.3 acres between the haukoad and Foidel Creek, and is located across from Pond C. Runoff from the area is approximately 0.01 acre-feet for the 10-year, 24-hour event, with runoff flows to be controlled and filtered by a berm, rock filters, and the established vegetative cover. Overland Belt West -This SAE covers approximately 0.5 acres between the haulroad embankment and railroad tracks west of the Haulroad C rail crossing. Runoff from this relatively flat area would be very limited, with estimated runoff for the 10-year, 24-hour event of 0.03 acre-feet. Any limited drainage flows would be treated by a rock filter. Pond D East Area -The Pond D East Area SAE covers 0.7 acres adjacent to the emergency spillway, overland conveyor, and haulroad. Runoff from this area flows along the haulroad and collects between the haulroad and the Pond D embankment, immediately to the east of the culvert, which conveys Pond D discharge to Foidel Creek. The area is vegetated, and a sump and rock filter treat the anticipated 0.04 acre -feet of runoff from the 10-year, 24-hour design storm event. Pond D West Area -This SAE covers 0.7 acres between the haulroad and pond embankment discharge point, along with a portion of the overland belt. CYCC constructed a rock filter to treat any of the anticipated 0.04 acre-feet, 10- year, 24-hour runoff from the area. • 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. TR08-65 2.05-81 08/20/08