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RULE 4 PERFORMANCE STANDARDS <br />and ditches and recontouring the road to the approved AOC as shown on Map 19 — Postmining <br />Topography South Area. The regraded areas will then have topsoil replaced and be reseeded. All of this <br />disturbed runoff will drain to either a sediment pond or an approved SAE, as appropriate. <br />Various best management practices are utilized- to minimize air and water pollution. With the exception <br />of the new South Taylor Haul Road, which will be surfaced with rock or crushed gravel as needed, the <br />haul roads A and B have been paved with asphalt to control air and water pollution, and ditches and <br />culverts exist to control runoff. The haul road A and B outslopes are vegetated to control sediment. <br />Portions of the haulroad A are located in. the vicinity of segments of Taylor creek that are deeply incised, <br />eroded and unstable. Rock lined energy dissipators are employed to reduce erosion on these -steep banks. <br />Protected ditch runouts to the natural drainage are employed to reduce erosion. Small dugouts are <br />employed as sediment traps. Vegetated areas are utilized as sediment filters. The haul road A is under <br />constant routine maintenance to avoid damage to environmental values. <br />The construction of both haul road segments A and B was completed in 1977. The design for the haul <br />roads had been prepared based on the anticipated volume of traffic and the weight and speed of vehicles <br />to be used. The Colowyo Coal haulage fleet used for transport of coal from the primary crusher to the <br />Gossard 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 haul roads A, B and the new South Taylor Haul Road throughout the life of the <br />mine with repairs including blading, filling of potholes, and replacement of road surface as necessary. <br />Likewise, watering for dust control will 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 4-3 Revision Date: 8/28/17 <br />Revision No.: TR -115 <br />