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RULE 4 PERFORMANCE STANDARDS <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 a <br />perennial stream, an intermittent stream, or an ephemeral stream with a drainage area greater than one <br />square mile, shall be disturbed by surface and underground coal mining operations unless the Division <br />specifically authorizes surface or underground mining operations closer to, or through such a stream. <br />Additionally, the area not to be disturbed shall be designated a stream buffer zone and marked as <br />specified in Section 4.02.5. <br />The locations of the disturbances that have occurred within 100' of a stream buffer zone are described <br />below and are depicted on Map IOC. <br />Good Springs Creek <br />Two sediment ponds were constructed within 100 feet of Good Springs Creek. The sediment ponds <br />include Streeter Pond and Gulch A Pond. During construction (during the late 1970's and early 1980's) <br />and to date these ponds have not created any adverse impacts to Good Springs Creek. These structures <br />are not anticpated to have any long term impacts to Good Springs Creek. <br />Other structures have been constructed or previously existed within 100 feet of Goodsprings Creek and <br />they include Colowyo's access road off of Highway 13 where it crossing Goodsprings Creek and <br />Colowyo's guard shack. Colowyo constructed the access road to the mine and the guard shack at the <br />beginning of the Colowyo Mine. To date the access road and guard shack have not created any adverse <br />impacts to Good Springs Creek, and these long term structures are not anticpated to have any long term <br />impacts to Good Springs Creek. <br />West Fork of Good Springs Creek <br />The access road to Secton 28 Pond off of Highway 13 was not a new disturbance when Colowyo began <br />using it to construct and access the Section 28 Pond. Rather it was premining, pre-existing "ranch" road, <br />that accessed an old ranch home and surrounding valley area. Colowyo made minor upgrades to the road <br />when the Sectoin 28 Pond was constructed. The majority of these upgrades were to allow proper draining <br />through swales across the road. To date the pre -mining ranch road and upgrades have not created any <br />adverse impacts to the West Fork of Good Springs Creek, and it is not anticipated that this road will have <br />any long term impacts either to the West Fork of Good Springs Creek. <br />Colowyo also has two surface water monitoring and two groundwater monitoring structures (flumes and <br />wells) installed within the stream buffer zone to the West Fork of Goodsprings Creek. This includes <br />LWFGSC, UWFGSC, A-7 and A-8 as presented on Map IOC. All four monitoring structures have not <br />and will not create any adverse impacts to the West Fork of Goodsprings Creek. <br />Taylor Creek <br />Colowyo constructed the mine access road within the stream buffer zone and the paved haul road to the <br />Gossard Loadout which crosses Taylor Creek. During construction (late 1970's to early 1980's) and to <br />date, the access road and haul road have not created any adverse impacts to Taylor Creek. These long <br />term structures are also not anticpated to have any long term impacts to Taylor Creek. <br />Two sediment ponds were constructed within the stream buffer zone on Taylor Creek. The West Pit Pond <br />embankment lies within 100' of Taylor Creek, and the West Taylor Pond was construted at the base of the <br />West Taylor Fill and makes up part of Taylor Creek. During construction and to date these strutucres <br />have not created any adverse impacts to Taylor Creek, and both structures are also not anticpated to have <br />any long term impacts to Taylor Creek. <br />Rule 4 Performance Standards 4-22 Revision Date: 8/28/17 <br />Revision No.: TR -115 <br />