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I. Dischazge of Water into an Underground Mine <br />1. There will not be any discharge of water into an underground mine <br />[4.05.16(2)]. <br />Stream Buffer Zones <br />The Division proposes to approve underground mining activities within <br />100 feet of the North Fork of the Gunnison River, which is a perennial stream <br />with a biological community. This decision is based on a finding that the <br />original stream channel will not be disturbed, water quality and quantity shall <br />not be adversely affected, and appropriate ripazian vegetation will be <br />reestablished. The buffer zone variance is granted for the water intake gallery, <br />sediment pond and associated spillways and ditches, a railroad siding, the <br />railroad loadout facility, alight-use road and a portion of the old Bear No. 1 <br />and 2 Mines site. These facilities are located on the north and south banks of <br />the North Fork of the Gunnison River, Figure 12 in the MCC permit shows <br />the disturbed areas within the buffer zone. The Division approved this <br />variance on August 6, 1981, according to Rule 4.05.18(1). This variance has <br />been amended and clarified as a result of Minor Revision No. 111, approved <br />December 16, 1993. <br />2. The Division approved underground mining, construction of haul/access <br />roads, and installation of a sediment pond (SG-1) and road embankment <br />within 100 feet of Sylvester Gulch. Sylvester Gulch is a stream with a <br />biological community as defined by Rule 4.05.18(3). A map of the Sylvester <br />Gulch Facilities Area, which delineates the area within 100 feet of Sylvester <br />Gulch is incorporated into Exhibit 69 of the permit document. The Division <br />approved this stream buffer zone variance in accordance with Rule 4.05.18(1) <br />based on a finding that the original stream channel will not be disturbed, water <br />quality and quantity will not be adversely affected, and appropriate riparian <br />vegetation will be reestablished. These conditions will be met by the effective <br />use of slope stabilization methods including Best Management Practices, <br />appropriate use of sediment control structures during construction, <br />revegetation, and mechanically stabilized earth (MSE) walls. <br />3. In this permit revision, Mountain Coal Company proposes a buffer beneath <br />the ripazian azea of Raven Creek as stipulated in lease No. COC-67011, of <br />660 feet (1/8 mile) on either side of the creek. This is shown on Map 52. <br />Since there is no mining proposed to the North of Raven Creek, the affected <br />area occurs only to the south of that stream and does not surround it. <br />44 <br />