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RULE 4 PERFORMANCE STANDARDS <br /> Colowyo does not anticipate that any water supply or water right of any owner of interest will be <br /> affected by the mining operation. <br /> 4.05.16 Discharge of Water into an Underground Mine <br /> No surface water will be diverted into any underground mine workings. <br /> 4.05.17 Post-mining and Rehabilitation of Sedimentation Ponds, Diversions, <br /> Impoundments, and Treatment Facilities <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 /> 4.05.18 Stream Buffer Zones <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 /> 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 /> Good Springs Creek <br /> Streeter Pond was constructed within 100 feet of Good Springs Creek. During construction <br /> (sometime during the late 1970's) and to date this pond has not created any adverse impacts to <br /> Good Springs Creek. This structure is not anticipated to have any long-term impacts to Good <br /> Springs Creek. <br /> Other 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 guard shack. Colowyo constructed the access road to the mine and the <br /> guard shack at the beginning of the Colowyo Mine. To date the access road and guard shack <br /> have not created any adverse impacts to Good Springs Creek, and these long term structures are <br /> not anticipated to have any long term impacts to Good Springs Creek. <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 /> Rule 4 Performance Standards 4-18 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />