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RULE 4 PERFORMANCE STANDARDS <br /> <br />Rule 4 Performance Standards 4-18 Revision Date: 4/9/25 <br /> Revision No.: MR-261 <br /> <br />4.05.16 Discharge of Water into an Underground Mine <br /> <br />No surface water will be diverted into any underground mine workings. <br /> <br />4.05.17 Post-mining and Rehabilitation of Sedimentation Ponds, Diversions, <br />Impoundments, and Treatment Facilities <br /> <br />No treatment facilities are planned. Approved permanent sedimentation ponds, stock ponds, and <br />permanent diversions will be left in place. These structures will be maintained in an appropriate <br />condition before the Permit area is abandoned by repairing any necessary portions, cleaning <br />sediment and debris out, establishing appropriate vegetation and providing soil stabilization. <br /> <br />4.05.18 Stream Buffer Zones <br /> <br />In accordance with Rule 4.05.18, no land within 100 feet, or greater if required by the Division, of <br />a perennial stream, an intermittent stream, or an ephemeral stream with a drainage area greater <br />than one square mile, shall be disturbed by surface and underground coal mining operations unless <br />the Division specifically authorizes surface or underground mining operations closer to, or through <br />such a stream. Additionally, the area not to be disturbed shall be designated a stream buffer zone <br />and marked as specified in Section 4.02.5. <br /> <br />The locations of the disturbances that have occurred within 100’ of a stream buffer zone are <br />described below and are depicted on Map 10C. <br /> <br />Good Springs Creek <br />Several structures have been constructed or previously existed within 100 feet of Goodsprings <br />Creek and they include Colowyo’s access road off of Highway 13 where it crossing Goodsprings <br />Creek and Colowyo’s security building. Colowyo constructed the access road to the mine and <br />the security building at the beginning of the Colowyo Mine. To date the access road and guard <br />shack have not created any adverse impacts to Good Springs Creek, and these long term <br />structures are not anticipated to have any long term impacts to Good Springs Creek. <br /> <br />West Fork of Good Springs Creek <br />The access road to Section 28 Pond off of Highway 13 was not a new disturbance when <br />Colowyo began using it to construct and access the Section 28 Pond. Rather it was premining, <br />pre-existing “ranch” road, that accessed an old ranch home and surrounding valley area. <br />Colowyo made minor upgrades to the road when the Section 28 Pond was constructed. The <br />majority of these upgrades were to allow proper draining through swales across the road. To <br />date the pre-mining ranch road and upgrades have not created any adverse impacts to the West <br />Fork of Good Springs Creek, and it is not anticipated that this road will have any long term <br />impacts either to the West Fork of Good Springs Creek. <br /> <br />Colowyo also has two surface water monitoring and two groundwater monitoring structures <br />(flumes and wells) installed within the stream buffer zone to the West Fork of Goodsprings <br />Creek. This includes LWFGSC, UWFGSC, A-7 and A-8 as presented on Map 10C. All four