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<br />The cumulative hydrologic assessment indicates that the mining operation has
<br />been designed to prevent material damage to the hydrologic balance of the
<br />ground water outside the permit area.
<br />References Cited
<br />Bass, N.M.; Eby, J.B.; and Campbell, M.r., 1955, Geology and Mineral fuels
<br />of parts of Routt and Moffat Counties, Colorado: Bulletin 1027-D,
<br />U.S.G.S., Plate 19.
<br />Boettcher, A.J., 1972, Ground-water Occurrence in Northern and Central
<br />Parts of Western Colorado, Colorado Water Conservation Board, Water
<br />Resources Circular 15.
<br />Brogden, R.E. and Giles, T.F., 1977, Reconnaissance of Ground-water
<br />Resources in a Part of the Yampa River Basin between Craig and
<br />Steamboat Springs, Moffat and Routt counties, Colorado, U.S.
<br />Geological Survey, Water Resources Investigation 77-4.
<br />McWhorter, D.B.; Rowe, J.W.; Van Liew, M.W.; Chander, R.L.; Skogerboe,
<br />R.K., Sunada, D.K.; and Skogerboe, G.V., 1979, Surface and Subsurface
<br />Water Quality Hydrology in Surface Mined Watersheds, U.S.E.P.A., EPA
<br />Pub. 600/7-790-193a.
<br />U.S. Bureau of Land Management, 1976, Environmental Impact Statement,
<br />Northwest Colorado Coal: Volume I, Regional Analysis and Vol. Site
<br />Specific Analysis, U.S. B.L.M., Department of the Interior
<br />U.S. Environmental Protection Agency, 1976, Quality Criteria for Water:
<br />U.S. Environmental Protection Agency, Washington, D.C., 20460, 256 pp.
<br />Warner, James W.; and Dale, Robert H., 1982, Digital-Transport Model Study
<br />of the Potential Effects of Coal-Resource Development on the
<br />Ground-Water System in the Yampa River Basin, Moffat and Routt
<br />Counties, Colorado: U.S. Geological Survey Water-Resources
<br />Investigation 81-15, 70 p.
<br />X. Climatological Information and Air Resources - Rules 2.04.8,
<br />Climatological data for Steamboat Springs and Hayden is provided on pages
<br />II.H-1 and II.H-2 of the application. Although Hayden is only 11 miles from
<br />the site, Steamboat precipitation means are probably closer to conditions at
<br />Grassy Gap, since the mine elevation is 7,400 to 8,000 feet, as compared to
<br />6,400 feet at Hayden and 6,700 feet at Steamboat Springs. Annual
<br />precipitation at Steamboat is 23.47 inches, with over 50% falling as snow from
<br />November through April.
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