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2011-07-22_REVISION - C1981019
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2011-07-22_REVISION - C1981019
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Last modified
8/24/2016 4:35:57 PM
Creation date
7/25/2011 11:17:31 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
REVISION
Doc Date
7/22/2011
Doc Name
3rd Adequacy Review Letter
From
DRMS
To
Colowyo Coal Company
Type & Sequence
PR3
Email Name
DIH
JHB
RDZ
TAK
MLT
Media Type
D
Archive
No
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Colowyo, 01981 -019, PR3 adequacy No. 3 24 July 22, 2011 <br />portion of Elk Draw with Bear Draw appears more appropriate. <br />The response is adequate. <br />3. Please explain the rationale for construction of stations 0+00 to 32 +00 of Bear Draw as a <br />permanent ditch. Making this reach temporary appears more appropriate. <br />The response is adequate. <br />4. The drainage areas for Tributary 3 and Upper Badger Draw (upper end above Deer Draw, <br />Section 30 +00) appear to be incomplete on Map 41 B. Please review and produce a revised <br />Map 41 B with complete drainage areas. <br />The response is inadequate. Ilse di ai loge ;vea for Tributar} 3 still appears to be incomplete on <br />Nlap 4111. Please recisc Map 41 B or pi % (to till ther discussion on this bruin and its relation to <br />haul i"cid drainuce- <br />5. A topographic drainage (no name) between Lower Badger and Little Collom is apparent in the <br />southwest quarter of Section 25. Concentrated flows will likely result, and erosion problems <br />could develop. Please review and revise as necessary. <br />Iha re.pon.c is .idalu.im. <br />Rule 4.05.4 Stream Channel Diversions /Relocations <br />1. More information is required for channel LCW, which is proposed as a vegetated channel in the <br />SEDCAD run. How will vegetation be established? What other means will be used to prevent <br />erosion per Rule 4.05.4(2)(a)? Also, see Rule 4.05.7 below. <br />l'he response remains inadequate. <br />Rule 4.05.5 Sediment Control Measures <br />The application is adequate with regard to this Rule. <br />Rule 4.05.6 Sedimentation Ponds <br />1. Detailed design information was provided for both the in -pit sump and the sediment pond <br />below the Little Collom X pit. Should worst -case sediment modeling be re-run due to mine <br />plan changes, please ensure that the designs are modified, if necessary, for these two structures. <br />The response appears to be adequate, but the designs are related to issues discussed below. <br />No additional respousc was required. <br />
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