Laserfiche WebLink
RULE 4 PERFORMANCE STANDARDS <br />4.03 Roads <br />The following sections deal with roads defined per Rule 1.04 (111). <br />4.03.1 Haul Roads <br />Haul roads at the Colowyo operation will be utilized and maintained to control or minimize erosion, <br />siltation, air and water pollution, and damage to public or-private property. The main haul road A for the <br />Colowyo operation is shown on the Existing Structures - North Map (Map. 21) and the Existing <br />Structures - South Map (Map 22). The main haul road A runs from the pit area (traffic crossover) to the <br />Gossard Loadout; the approximate length of this haul road is four miles. The profile for haul road A is <br />shown on the Haul Road "A" Profile (Map 25). <br />The haul road B was formerly the access road from Highway 13 to the haul road A intersection leading to <br />the Gossard Loadout. Colowyo requested a change in the road status by Technical Revision in June, 1992. <br />The status change was made necessary at the request of our customer Tri-State Generation and <br />Transmission Association, Inc. (Tri-State) and their intention to transport coal to the Craig Station by <br />truck rather than rail. The haul road B is shown on Existing Structures - North Map (Map 21) and Haul <br />Road "B" Profile (Map 25A). The approximate length of the road is 1.4 miles. <br />The roads used in the actual mining area constantly change as the operation progresses. The "in-pit" roads <br />are maintained by a motor grader and are regularly wetted to minimize dust. Any drainage off the "in-pit" <br />roads will be retained in the pit or diverted to the drainage and sediment control structures located on the <br />Hydrology - South Map (Map 12). <br />Various best management practices are utilized- to minimize air and water pollution. The haul roads have <br />been paved with asphalt to control air and water pollution, and ditches and culverts exist to control runoff. <br />The haul road outslopes are vegetated to control sediment. Portions of the haulroad are located in. the <br />vicinity of segments of Taylor creek that are deeply incised, eroded and unstable. Rock lined energy <br />dissipators are employed to reduce erosion on these-steep banks. Protected ditch runouts to the natural <br />drainage are employed to reduce erosion. Small dugouts are employed as sediment traps. Vegetated areas <br />are utilized as sediment filters. The haul road is under constant routine maintenance to avoid damage to <br />environmental values. <br />The construction of both haul road segments was completed in 1977. The design for the haul roads had <br />been prepared based on the anticipated volume of traffic and the weight and speed of vehicles to be used. <br />The Colowyo Coal haulage fleet used for transport of coal from the primary crusher to the Gossard <br />Loadout consists of highway trucks. <br />The haul roads are located on stable terrain to minimize erosion. As shown on the Existing Structures - <br />North Map (Map 21), the haul road A crosses Taylor Creek, and has been maintained according to the <br />requirements of 4.03.1(4). The grade and pitch requirements specified in 4.03.1(3), Design and <br />Construction, are met for both haul roads. <br />Colowyo will maintain the haul roads throughout the life of the mine with repairs including blading, <br />filling of potholes, and replacement of road surface as necessary. Likewise, watering for dust control will <br />be implemented as necessary. <br />Section 2.05.5 discusses the changes to be made to the main haul road, a portion of which will be left in <br />place after completion of mining to retain access into the area to compliment the post mining land use. <br />Rule 4 Performance Standards 4.03-1 Revision Date: 6/23/08 <br />Revision No.: MR-91