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S~iae - 2.04.7 well-drained rnateriak, however, sodium is rapidly leached through the soil profile and does not limit • plant growth. Weathering and leaching of the spoil material will result in increased calcium and magnesium concentrations and reduced SAR with time. This is supported by the high acid-base potentiak (discussed above) which indicate the presence of CaCOt. In addition, provisions for effective control of surface drainage and infiltration in the waste pile design (i.e. underdrainc and diversion channek) will effectively provide Eor free drainage which will prevent any significant accumulations of sodium in the waste pile material profile. No problems are, therefore, anticipated with respect to sodium concentrations in the coal Honing waste materials. '~ Texture (Tex) -Most of the materials are classified az sandy loamy, sandy clay loamy or loamy sands. No problems are, therefore, anticipated with respect to soil texture. In summary, bazed on analysis resulu, potential coal mining waste materials are expected to have neutral to moderately alkaline pH with little or no potential for acid-generation; moderate to coarse texture with limited potenrial for swelling or drainage problems; little or no potential for mobilization of soluble metak; and minor potential, bazed on texture and other factors, for development of saline conditions. Coal Seams -Five economically significant coal horizons have been identified and developed in the mine permit and adjacent areaz. Two of these horizons, containing the D and E coal seams, occur in the Paonia Member of the Mesa Verde Formation, while the re**»~~~~g A, B, and C coal horizoru occur in the Bowie Member of the Mesa Vence Formation. The following sections describe the economicallysignificant coal units in descending order, designated by both seam designation and local designations based on the pritrtary mine on each seam E Horizon (Hawks Nest) - The E coal horizon occurs approximately 150 feet above the baze of the Paonia Member and consisu of two delineated coal seams. The E-1 coal seam is approximately 6 feet thick and is relatively continuous over the mine pertrut area. The E-2 coal seam u relatively continuous but reaches a rriineable thickness of approximately 7 feet only in the Somerset -Hawks Nest Creek area. The E coal seam has been mined at the Hawks Nest Mine by Western Slope Carbon. Estimated coal quality parameters are; Percent azh (E-1 - 4.3, E-2 - 15.1 (includes un- sampled partings at 100%)); Percent volatile matter on a moisture/ash free basis (E-1 - 39.7, E-2 - 41.9); and Percent fixed carbon on a moisture/azh free bazis (E-1 - 60.3, E-2 - 58.1). D Horizon (Oliver) - The D coal horizon occurs immediately above the massive sandstone which caps the Bowie Member and consists of four delineated coal seams, the D-lA, D-1, D-2 and D-3 seams. The D horizon lies approximately 200 feet above the C seam and is laterally continuous. While the D Coal Seams may be relatively thick in certain areas, they are generally no[ persistent over the mine permit area, with the D-lA and D-1 seams generally being un-minable due to variations in thickness and continuity The D-2 coal seam is approximately 10.4 feet chick and the D-3 coal seam reaches an average mineable thickness of approximately 8.8 feet. The D Coal Seam has been mined at the Oliver Mme and OMI u proposing future D seam operations for the Ells Creek Mme. Exploration drilling did not encounter any igneous intrusives in the D horizon but drilling resulu did indicate that the lowermost D- lA seam had been metamorphosed in-place to natural coke. Estimated coal quality parameters are; Percent ash (D-2 - 5.6, D-3 - 11.2 (includes tut-sampled partings at 100%)); Percent volatile matter on a moisture/azh free basis (D-2 - 40.6, D-3 - 42.3); and Percent fixed carbon on a moisture/azh free basis (D-2 - 59.4, D-3 - 57.x. ~C Horizon (Bear) - The C coal horizon occurs approximately 70 to 200 feet above the Rollins Sandstone Member and consists of a single delineated coal seam The C coal seam ranges from approximately 1 to 13 feet in thickness, with an average mineable thickness of approximately 7.8 feet. In the Terror Creek area, the C coal seam is cut by igneous intrusive sills which have replaced much of the coal and metamorphosed the remainder to natural coke. The C coal seam has been mined at the Bear Mute, across the North Fork of the Gunnison River by Bear Coal Company Estimated coal quality parameters are; Percent ash (C - 7.8 (includes un-sampled partings at 100%)); Percent volatile PR04 2.04-17 Revised August 2000