2009-08-13_PERMIT FILE - C1981019A

Home Browse Search

RULE 4 PERFORMANCE S 4.03 Roads The following sections deal with roads defined per Rule 1.04 (111). 4.03.1 Haul Roads Haul roads at the Colowyo operation will be utilized and maintained to control or minimize erosion, siltation, air and water pollution, and damage to public or- private property. The main haul road A for the Colowyo operation is shown on the Existing Structures - North Map (Map. 21) and the Existing Structures - South Map (Map 22). The main haul road A runs from the pit area (traffic crossover) to the Gossard Loadout; the approximate length of this haul road is four miles. The profile for haul road A is shown on the Haul Road "A" Profile (Map 25). The haul road B was formerly the access road from Highway 13 to the haul road A intersection leading to the Gossard Loadout. Colowyo requested a change in the road status by Technical Revision in June, 1992. The status change was made necessary at the request of our customer Tri -State Generation and Transmission Association, Inc. (Tri- State) and their intention to transport coal to the Craig Station by truck rather than rail. The haul road B is shown on Existing Structures - North Map (Map 21) and Haul Road "B" Profile (Map 25A). The approximate length of the road is 1.4 miles. The roads used in the actual mining area constantly change as the operation progresses. The "in -pit" roads are maintained by a motor grader and are regularly wetted to minimize dust. Any drainage off the "in -pit" roads will be retained in the pit or diverted to the drainage and sediment control structures located on the Hydrology - South Map (Map 12). Due to the nature of the South Taylor Pit Expansion, Colowyo will construct and maintain a haul road that will be located within the Disturbance Boundary and partially outside the active mining boundary. The South Taylor Haul Road's location can be found on Map 23 — Mine Plan South Area with its design details being located on Map 25C — South Taylor Haul Road. Please refer to Permit Volume Twelve, Section 4.03.1 — Haul Roads for text related to this haul road. Reclamation of the South Taylor Haul Road to AOC will be addressed as required by Rule 4.03.1(7) and will take place after Colowyo has determined that the road will no longer be needed for operations, reclamation or monitoring, presumably during reclamation of the final pit area. Various best management practices are utilized- to minimize air and water pollution. With the exception of the new South Taylor Haul Road, which will be surfaced with rock or crushed gravel as needed, the haul roads A and B have been paved with asphalt to control air and water pollution, and ditches and culverts exist to control runoff. The haul road A and B outslopes are vegetated to control sediment. Portions of the haulroad A are located in the vicinity of segments of Taylor creek that are deeply incised, eroded and unstable. Rock lined energy dissipators are employed to reduce erosion on these -steep banks. Protected ditch runouts to the natural drainage are employed to reduce erosion. Small dugouts are employed as sediment traps. Vegetated areas are utilized as sediment filters. The haul road A is under constant routine maintenance to avoid damage to environmental values. The construction of the haul road segments A and B was completed in 1977. The design for the haul roads had been prepared based on the anticipated volume of traffic and the weight and speed of vehicles to be used. The Colowyo Coal haulage fleet used for transport of coal from the primary crusher to the Gossard Loadout consists of highway trucks. The haul roads are located on stable terrain to minimize erosion. As shown on the Existing Structures - North Map (Map 21), the haul road A crosses Taylor Creek, and has been maintained according to the requirements of 4.03.1(4). The grade and pitch requirements specified in 4.03.1(3), Design and Construction, are met for both haul roads. Rule 4 Performance Standards 4.03 -1 Revision Date: 7/27/09 Revision No.: TR -76