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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 tivill be utilized and maintained to control or minimize <br />erosion, siltation, air and water pollution, and damage to public or-private property. The main <br />haul road A for the Colowyo operation is shown on the Existing Structures -North Map <br />(Ivlap. 21) and the Existing Structures -South Map (Map 22). The main haul road A runs <br />from the pit area (traffic crossover) to the Gossard Loadout; the approximate length of this <br />haul road is four miles. The profile for haul road A is shown on the Haul Road "A" Profile <br />(Map 25). <br />The haul road B was formerly the access road from Highway 13 to the haul road A <br />intersection leading to the Gossard Loadout. Colowyo requested a change in the road status <br />by Technical Revision in June, 1992. The status change was made necessary at the request of <br />our customer Tri-State Generation and Transmission Association, Ina (Tri-State) and their <br />intention to transport coal to the Craig Station by truck rather than rail. The haul road B is <br />shown on Existing Structures -North Map (Map 21) and Haul Road "B" Profile (Map 25A). <br />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 <br />"in-pit" roads are maintained by a motor grader and are regularly wetted to minimize dust. <br />Any drainage off the "in-pit" roads will be retained in the pit. or diverted to. the drainage and <br />sediment control structures located on the Hydrology -South Map (Map 12). <br />Various best management practices are utilized- to minimize air and water pollution. The <br />haul roads have been paved with asphalt to control air and water pollution, and ditches and <br />culverts exist to control runoff. The haul road outslopes are vegetated to control sediment. <br />Portions of the haulroad are located in. the vicinity of segments of Taylor creek that are <br />deeply incised, eroded and unstable. Rock lined energy dissipators are employed to reduce <br />erosion on these-steep banks. Protected ditch runouts to the natural drainage are employed to <br />reduce erosion. Small dugouts are employed as sediment traps. Vegetated areas are utilized <br />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 <br />• <br />4.03-1 Revision Date: 5/17/99 <br />Revision No.: MR-53 <br />