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RULE 2 PERMITS <br /> <br />Rule 2 Permits 2.04-40 Revision Date: 11/1/21 <br /> Revision No.: TR-150 <br />Prospect 1,400 2,200 3,600 <br />Final East Pit 1,200 4,600 5,800 <br />Section 16 Fill 0 900 900 <br />South Connection 0 1,200 1,200 <br />West Pit 2,700 14,300 17,000 <br />Taylor Tributary 2,500 11,500 14,000 <br />West Pit Fill 1,300 5,000 6,300 <br />Permanent Drainage Channels <br />Total 17,300 60,900 78,200 <br /> <br />This rock riprap protection in the channels on steep slopes will pass the intermittent low flows <br />normally found in the area and approximate the original cascading flows while protecting the <br />channel during the infrequent high flows the design event is likely to produce. Given time, <br />vegetation will encroach portions of these channels, debris will accumulate and the stream will <br />again reach a state of dynamic equilibrium. Calculation for rock riprap sizing and gradation are <br />found in Exhibit 7. <br /> <br />Selected References <br /> <br />Bishop, M., Kelly, K., Kimball, D. and G. Quinn 1982 Cumulative hydrologic assessment: Effects <br />of coal mining on the Yampa River basin, Moffat and Routt Counties, Colorado. Report to <br />U.S. Department of Interior Office of Surface Mining and Colorado Department of Natural <br />Resources Mined Land Reclamation Division. KT-81-031 (R). January. <br /> <br />EMRIA Report No. 3-1975. Resource and potential reclamation evaluation: Taylor Creek study <br />site Axial Basin coal field. <br /> <br />Giles, T.F. and R.E. Brogden 1978. Selected hydrologic data, Yampa River basin and parts of the <br />White River basin, Northwestern Colorado and Southcentral Wyoming. USGS Open-file <br />Report 78-23. <br /> <br />Leonard Rice Consulting Water Engineers 1979. Ground water quality Colowyo Coal Mine. <br />October 1979. <br /> <br />NAS 1972. National Academy of Sciences Water Quality Criteria, 1972. U.S. Government <br />Printing Office, Washington, D.C. <br /> <br />Parker, R.S. and J.T. Turk 1981. Water quality characteristics of six small, semiarid watersheds in <br />the Green River coal region of Colorado. USGS Water Resources Investigation 81-19. <br /> <br />Skogerboe, R.K., Lavallee, C.S., Miller, M.M. and D.L. Dick. 1979. Environmental effects of <br />western coal surface mining: Part III - The water quality of Trout Creek, Colorado. USEPA, <br />EPA-600/3-79-008. January.