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Mine, located approximately 4 miles to the southeast of the proposed lease area. All estimates of annual and rural 24-hour particulates and gaseous pollutant levels near the proposed lease area are within applicable standards. The nearest Prevention of Significant Deterioration Claee I area ie the Flat Tope Wilderness Area, approximately 10 miles to the south. Additional detailed information on the climate of this area ie contained in the Site Specific Climate and Air quality Analysis, Fish Creek Tract, prepared by Radian Corporation, (1983). Geolow The Foidel Creak Mine is located in the southern end of the Sand Wash Basin structural province. Locally, it is on the eastward dipping limb between the Fieh Creek Anticline on the west and the Twentymile Park Syncline on the east. Numerous en echelon faults trend northwest-southeast with dieplacemente varying from lees than 10 feet to 80 feet. The surface of the proposed lease area ie underlain primarily by the Williams Fork Formation of the Meeaverde Group. The western moat part of section 36 ie underlain by the Lewis Shale. Both formations are Late Cretaceous in age. The Meeaverde Group consists of two formations: The Iles Formation and the Williams Fork Formation. The Williams Fork Formation ie the youngest of two ' formations. It is composed of sandstone, eiltstone, shale, and coal and ie the primary coal producing formation of the Yampa Coal Field that extends generally through the Williams Fork Mountains from the town of Oak Creek to the town of Lay. The Meeaverde Group contains three separate coal groups: the Lower, Middle and Upper Coal groups. The Lover Coal Group ie part of the Ilea Formation that lies conformably beneath the Williams Fork Formation. It fe of such depth that it is not a factor in this lease application. The Middle Coal Group lies within the basal Williams Fork Formation and contains the seam of interest to this application. The Upper Coal Group occurs above the Twentymile Sandstone Member of the Williams Fork Formation and has been mined out by CWCC'e surface operations. The Twentymile Sandstone Member ie a significant marker bed within the Williams Fork Formation. It is a massive, coarsening upward, clean, white sandstone often 100 feet thick. The Twentymile Sandstone trope out within the eastern portion of the proposed lease area and forme a striking cliff. Figure 1 shows a generalized etratigraphic column of the area. Additional information can be found in the Fieh Creek Tract Profile and Site Specific Analysis, 1982 (Bureau of Land Management, 1982, pp. 4-22). 6