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RULE 4 PERFORMANCE STANDARDS <br /> Pydn 1kR ". ;^" 0,,4k4A.-s:atAiw^Avi.Y4k.r.:•.~44-~x4x .+5k 00.0°#6 *1,V 4".a44'r <br /> Topography South Area. The regraded areas will then have topsoil replaced and be reseeded. All <br /> of this 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. Haul Roads <br /> A and B have been paved with asphalt to control air and water pollution, and ditches and culverts <br /> exist to control runoff.The haul road A and B outslopes are vegetated to control sediment. Portions <br /> of the Haul Road 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 <br /> banks. Protected ditch runouts to the natural drainage are employed to reduce erosion. Small <br /> dugouts are employed as sediment traps. Vegetated areas are utilized as sediment filters. The Haul <br /> Road A is under constant routine maintenance to avoid damage to environmental values. <br /> The construction of both haul road segments A and B was completed in 1977;however,Haul Road <br /> A was widened in 2018 including an upper and lower ditch for long term stability of the fill <br /> materials (please see Exhibit 7 Item 15) . The design for both haul roads had been prepared based <br /> on the anticipated volume of traffic and the weight and speed of vehicles to be used. The Colowyo <br /> Coal haulage fleet used for transport of coal from the primary crusher to the Gossard Loadout <br /> consists of highway trucks, and transport of large mining equipment to and from the Collom Pit. <br /> The haul roads are located on stable terrain to minimize erosion. As shown on the Existing <br /> Structures -North Map(Map 21),the haul road A crosses Taylor Creek, and has been maintained <br /> according to the requirements of 4.03.1(4). The grade and pitch requirements specified in <br /> 4.03.1(3), Design and Construction, are met for both haul roads. <br /> Colowyo will maintain haul roads A and B throughout the life of the mine with repairs including <br /> blading, filling of potholes, and replacement of road surface as necessary. Likewise, watering for <br /> 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 <br /> left in place after completion of mining to retain access into the area to compliment the post mining <br /> land use. <br /> Rule 4 Performance Standards 4-3 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />