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2021-08-09_PERMIT FILE - C1981019A (5)
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2021-08-09_PERMIT FILE - C1981019A (5)
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Last modified
8/25/2023 7:19:26 PM
Creation date
4/26/2022 2:58:21 PM
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Template:
DRMS Permit Index
Permit No
C1981019A
IBM Index Class Name
Permit File
Doc Date
8/9/2021
Doc Name
Volume 1 Rule 4
Section_Exhibit Name
4.01 Through 4.30
Media Type
D
Archive
Yes
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RULE 4 PERFORMANCE STANDARDS <br /> a.. ...:fir tp...: .x .._.f• c ..»c .A..««:r,a!-,- :-a W:<..,�ta:».ss a: .,a.t3a max<a -:r.?::...e,...... ..,. , ...s�a..+..cyr+•...2s.gt+r.w .:..... r,.s w,: <br /> No additional diversions of intermittent or perennial streams are planned or provided for at this <br /> time.. <br /> 4.05.5 Sediment Control Measures <br /> Sediment control measures to be implemented are shown Map 12. These facilities, consisting <br /> primarily of diversion ditches and sedimentation ponds, will be located, constructed and <br /> maintained to avoid erosion and increased contribution of sediment load to runoff. Discussion on <br /> the sediment and drainage control is presented under Section. 2.05.6. The design parameters of the <br /> various sedimentation control 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 Map 12 and 12A. The <br /> design plans and specifications for the sedimentation ponds are described in this section. The <br /> design parameters and detailed sedimentation calculations for the sedimentation ponds are shown <br /> in Exhibit 7, Hydrology Information. The sedimentation pond embankment and emergency <br /> spillway design are also shown in Exhibit 7,Hydrology Information.All sedimentation ponds will <br /> be located as close as practical to the areas to be disturbed. Other methods of sediment control will <br /> be located on the reclaimed areas; these methods include the use of contour furrowing, contour <br /> drainage ditches, chisel plowing and revegetation etc. <br /> This application contains calculations used to determine runoff volumes and flow rates for a <br /> theoretical 10-year, 24-hour precipitation event and subsequent sediment volumes. The <br /> precipitation data were obtained from the NOA Atlas 2, Volume 3 for Colorado; soil types were <br /> obtained from the Soil Conservation Service, and are shown on the Soils - South Map(Map 6)and <br /> the Soils -North Map (Map 5). <br /> The ongoing mining activities within each watershed of the permit area will create constantly <br /> changing hydrologic conditions. The design models are generally based on a static, theoretical <br /> scenario, utilizing SEDCAD+ Version Ill which considers a final reclamation and pit closure <br /> Rule 4 Performance Standards 4-10 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />
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