2019-04-19_REVISION - C1981019 (6)

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RULE 4 PERFORMANCE STANDARDS Rule 4 Performance Standards 4-24 Revision Date: 4/29/19 Revision No.: MR-201 4.05.17 Post-mining and Rehabilitation of Sedimentation Ponds, Diversions, Impoundments, and Treatment Facilities No treatment facilities are planned. Approved permanent sedimentation ponds, stock ponds, and permanent diversions will be left in place. These structures will be maintained in an appropriate condition before the Permit area is abandoned by repairing any necessary portions, cleaning sediment and debris out, establishing appropriate vegetation and providing soil stabilization. 4.05.18 Stream Buffer Zones In accordance with Rule 4.05.18, no land within 100 feet, or greater if required by the Division, of a perennial stream, an intermittent stream, or an ephemeral stream with a drainage area greater than one square mile, shall be disturbed by surface and underground coal mining operations unless the Division specifically authorizes surface or underground mining operations closer to, or through such a stream. Additionally, the area not to be disturbed shall be designated a stream buffer zone and marked as specified in Section 4.02.5. The locations of the disturbances that have occurred within 100’ of a stream buffer zone are described below and are depicted on Map 10C. Good Springs Creek Two sediment ponds were constructed within 100 feet of Good Springs Creek. The sediment ponds include Streeter Pond and Gulch A Pond. During construction (during the late 1970’s and early 1980’s) and to date these ponds have not created any adverse impacts to Good Springs Creek. These structures are not anticipated to have any long-term impacts to Good Springs Creek. Other structures have been constructed or previously existed within 100 feet of Goodsprings Creek and they include Colowyo’s access road off of Highway 13 where it crossing Goodsprings Creek and Colowyo’s guard shack. Colowyo constructed the access road to the mine and the guard shack at the beginning of the Colowyo Mine. To date the access road and guard shack have not created any adverse impacts to Good Springs Creek, and these long term structures are not anticipated to have any long term impacts to Good Springs Creek. West Fork of Good Springs Creek The access road to Section 28 Pond off of Highway 13 was not a new disturbance when Colowyo began using it to construct and access the Section 28 Pond. Rather it was premining, pre-existing “ranch” road, that accessed an old ranch home and surrounding valley area. Colowyo made minor upgrades to the road when the Section 28 Pond was constructed. The majority of these upgrades were to allow proper draining through swales across the road. To date the pre-mining ranch road and upgrades have not created any adverse impacts to the West Fork of Good Springs Creek, and it is not anticipated that this road will have any long term impacts either to the West Fork of Good Springs Creek. Colowyo also has two surface water monitoring and two groundwater monitoring structures (flumes and wells) installed within the stream buffer zone to the West Fork of Goodsprings