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2013-02-01_REVISION - C1981041 (8)
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2013-02-01_REVISION - C1981041 (8)
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Last modified
8/24/2016 5:12:46 PM
Creation date
2/1/2013 2:32:16 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981041
IBM Index Class Name
Revision
Doc Date
2/1/2013
Doc Name
Proposed Decision & Findings
From
DRMS
To
Snowcap Coal Company
Type & Sequence
RN6
Email Name
MPB
SB1
Media Type
D
Archive
No
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applicable state law, will not diminish downstream water rights, and will meet the <br />requirements of Rules 4.05.4 (4.05.4(4)). <br />2. The permanent diversions shall make use of artificial structural controls in order to allow <br />them to remain in dynamic equilibrium with the drainage basin system. The Division <br />approves the use of rip -rap channel lining along various segments of these channels. <br />Channel lining structures and artificial channel roughness structures are proposed for use to <br />control erosion. Artificial structures include a rip -rap transition zone structure in the Coal <br />Creek channel at the location of the former Haul Road 2 crossing, and riprap lining along the <br />South Portal facilities permanent diversion and the Coal Gulch permanent diversion segment. <br />These means were approved by the Division since they are necessary to control erosion, they <br />are stable and will require infrequent maintenance (4.05.4(2)(a)). <br />4. In addition to the permanent diversions mentioned above, a permanent diversion of an <br />ephemeral stream draining less than one square mile has been approved for an unnamed <br />ephemeral tributary to the Colorado River located within the 2 West Portal Disturbance Area. <br />The outside bank closest to the North Portal was built up to prevent the diverted stream from <br />entering the portal. Bedrock lies close to the bottom of the diverted channel and the channel <br />does not require armoring. This decision is based on a finding that the proposed diversion <br />meets the requirements of 4.05.18 and 4.05.4, applicable local, State, and Federal statutes and <br />regulations and that the diversion is designed to safeguard public safety and to minimize <br />adverse impacts to the hydrologic balance (4.05.4(1) and (4)). <br />D. Sedimentation Ponds <br />Information on the surface water sediment control system can be found in Volume 3, Tab 13, page <br />13 -5 of the permit application. A list of sediment control structures, along with references to <br />appropriate exhibits for designs and cross sections, are found in Table 13 -4 of the application. <br />Calculations used to design these structures are given in appendix 13 -2 of the permit application. <br />During operations a total of 12 sediment ponds were designed and built and treated disturbed -area <br />surface water runoff under the existing permit for the Roadside Mines. All ponds have performed <br />well over this period. To date eleven of the twelve ponds have been fully reclaimed. References to <br />designs for these ponds and their locations are found in Tables 13 -5 and 13 -6 of the permit <br />application. <br />With the exception of approved small area exemptions, all surface runoff from disturbed areas was <br />routed through one of these sediment ponds. All but two sediment ponds were designed to contain <br />the runoff and sediment from a 10 -year, 24 -hour precipitation event. Sediment Ponds 41 and 42 <br />were combined to contain the 25 -year, 24 -hour storm event. Sediment ponds 41, 42, 47, 48 and <br />411 required pumps as the principal dewatering mechanism because the surrounding ground <br />elevations were higher than the sediment pond bottom elevations. The emergency spillways were <br />designed to pass the 25 -year, 24 -hour peak flow. The outflow below the spillway was armored <br />with riprap where necessary to control erosion. <br />There is no Sediment Pond 43. Former Ponds 1, 2, 4, 5, 6, 7, 8, 10, 11, and 12 have been <br />reclaimed. Pond 9 the final remaining pond will be reclaimed in 2013. <br />24 <br />
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