2020-03-24_PERMIT FILE - C1981019A ‎(5)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 3/24/2020
• Type & Sequence: TR135
• Section_Exhibit Name: 2.04 Information on Environmental Resources
• Media Type: D
• Archive: Yes

RULE 2 PERMITS
West Pit Fill 1,300 5,000 6,300
Permanent Drainage Channels
Total 17,300 60,900 78,200
This rock riprap protection in the channels on steep slopes will pass the intermittent low flows
normally found in the area and approximate the original cascading flows while protecting the
channel during the infrequent high flows the design event is likely to produce. Given time,
vegetation will encroach portions of these channels, debris will accumulate and the stream will
again reach a state of dynamic equilibrium. Calculation for rock riprap sizing and gradation are
found in Exhibit 7.
Selected References
Bishop,M.,Kelly,K.,Kimball,D. and G. Quinn 1982 Cumulative hydrologic assessment: Effects
of coal mining on the Yampa River basin,Moffat and Routt Counties, Colorado. Report to
U.S. Department of Interior Office of Surface Mining and Colorado Department of Natural
Resources Mined Land Reclamation Division. KT-81-031 (R). January.
EMRIA Report No. 3-1975. Resource and potential reclamation evaluation: Taylor Creek study
site Axial Basin coal field.
Giles, T.F. and R.E. Brogden 1978. Selected hydrologic data, Yampa River basin and parts of the
White River basin, Northwestern Colorado and Southcentral Wyoming. USGS Open-file
Report 78-23.
Leonard Rice Consulting Water Engineers 1979. Ground water quality Colowyo Coal Mine.
October 1979.
NAS 1972. National Academy of Sciences Water Quality Criteria, 1972. U.S. Government
Printing Office, Washington, D.C.
Parker, R.S. and J.T. Turk 1981. Water quality characteristics of six small, semiarid watersheds in
the Green River coal region of Colorado. USGS Water Resources Investigation 81-19.
Skogerboe, R.K., Lavallee, C.S., Miller, M.M. and D.L. Dick. 1979. Environmental effects of
western coal surface mining: Part III-The water quality of Trout Creek,Colorado.USEPA,
EPA-600/3-79-008. January.
Shiffler,W.D.and R.A.Rhodes 1981.Hydrologic and erosional characteristics of regraded surface
coal mined land in Colorado. Department of Earth Resources, Colorado State University,
Ft. Collins, CO.
VTN 1975. Environmental impact assessment for the proposed Colowyo Mine, Colowyo Coal
Cbrnpa.uy. Dc.ciir4tr.
Rule 2 Permits 2.04-40 Revision Date: 12/20/19
Revision No.: TR-135