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2020-03-31_PERMIT FILE - C1981019A (6)
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2020-03-31_PERMIT FILE - C1981019A (6)
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Entry Properties
Last modified
5/11/2020 6:39:12 PM
Creation date
5/9/2020 3:16:19 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981019A
IBM Index Class Name
Permit File
Doc Date
3/31/2020
Doc Name
Volume 1 Rule 4
Type & Sequence
TR136
Section_Exhibit Name
4.01 Through 4.30
Media Type
D
Archive
Yes
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RULE 4 PERFORMANCE STANDARDS <br />temporary diversion structures will be seeded and revegetated. Colowyo does not anticipate that <br />there will be any significant excess material resulting from the construction of diversion ditches. <br />None of the proposed diversions will drain into underground mines. <br />No additional diversions of intermittent or perennial streams are planned or provided for at this <br />time. See Mine Plan Map (Map 23), Hydrology South Map (Map 12) and Hydrology - North Map <br />(Map 11). As indicated on these maps, the stream channels of Goodspring Creek will be <br />maintained in its natural positions. <br />4.05.5 Sediment Control Measures <br />Sediment control measures to be implemented are shown on the Hydrology - South Map (Map 12) <br />and the Hydrology - North Map (Map 11). These facilities, consisting primarily of diversion <br />ditches and sedimentation ponds, will be located, constructed and maintained to avoid erosion and <br />increased contribution of sediment load to runoff. Discussion on the sediment and drainage control <br />is presented under Section. 2.05.6. The design parameters of the various sedimentation control <br />measures are found in Exhibit 7, Hydrology Information. <br />As necessary, facilities to control sediment will be installed in areas above or below the planned <br />sites of disturbance. "Upstream" facilities, such as temporary diversion ditches and- check dams <br />up slope from the mining activities, will divert runoff away from the disturbed areas. Temporary <br />diversion ditches below the disturbed area will divert runoff into sediment ponds. The actual <br />mining areas will aid in retaining sediment within the disturbed areas by catching water in pits, <br />small depressions and dozer basins, etc. in active, unreclaimed mine workings. Water leaving the <br />reclaimed areas will drain into contour furrows or other sediment traps, as necessary, before <br />entering the sedimentation pond. <br />Small Area Exemptions from time to time, it may be necessary to have small areas that do not <br />drain to a sediment pond. Alternative sediment control measures will be used for these areas. <br />These will be designed to meet the requirements of Rule 4.05.2.3 and Rule 4.05.5. Exhibit 7, Item <br />14-P (Volume 2C) provides a specific design for a small borrow pit needed to construct the <br />embankment for the Section 28 Sediment pond. <br />4.05.6 Sedimentation Ponds <br />The location of all existing and planned sedimentation ponds are presented on the Hydrology - <br />South Map (Map 12) and the Hydrology - North Map (Map 11). The design plans and <br />specifications for the sedimentation ponds are described in this section. The design parameters and <br />detailed sedimentation calculations for the sedimentation ponds are shown in Exhibit 7, Hydrology <br />Information. The sedimentation pond embankment and emergency spillway design are also shown <br />in Exhibit 7, Hydrology Information. All sedimentation ponds will be located as close as practical <br />to the areas to be disturbed. Other methods of sediment control will be located on the reclaimed <br />areas; these methods include the use of contour furrowing, contour drainage ditches, chisel <br />plowing and revegetation etc. <br />Rule 4 Performance Standards 4-10 Revision Date: 5/25/18 <br />Revision No.: RN -07 <br />
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