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The FCB is located on Fish Creek approximately 2 miles northwest of the main facility area in Section 23, TSN R87W. It consists of 2 dewatering boreholes, an inactive ventilation shaft, 3 treatment ponds, associated roads, a substation, a utility building, and water treatment equipment. The SW vent facility consists of a vent fan and building, pad area, and associated roads located in Section 36, TSN R87W. The EMD vent facility is located in Section 14, TSN R86W and consists of two ventilation shafts (intake air and return air), and associated buildings. The EMD borehole and treatment pond disturbed areas are located in Section 21, TSN R86W and consist of a few small buildings, water treatment cells and associated structures. The Sandstones substation in Section 20, TSN R86W no longer serves as a power drop to the mine and the nearby North Escape Shaft has no facilities but exists as a completed 3 foot diameter shaft only to be used as an underground emergency extraction point for miners. The FCT facility is located approximately 5 miles northeast of the main portal area in Section 2, TSN R86W, about 7 miles downstream on Fish Creek from the FCB facility. It was originally petmit[ed separately under permit No. C-81-036 but since has been incorporated into the Foidel Creek permit No. C-82-056. It consists of a rail loadout, crushing and screening equipment, conveyors, stockpile areas, and a sediment control system of ditches and one pond. The FCT facility has been since Mine No. 3 (No. C-84-062) completed mining, and is currently inactive as of the writing of this document in March of 1996. The proposed permit expansion area lies on the south end of the regionally significant Sand Wash structural basin. locally significant are the rock units of Twentymile Park Basin which dip 5~ - 30~ toward the central portion of the basin. Notmal faulting has been identified throughout the permit area, striking generally northwest to southeast, with displacement of zero to 85 feet. A reverse fault running in an arcuate line northward through the west central part of the basin shows displacement of 0-80 feet. Smaller lateral faults were encountered in the 9R and lOR gateroads while driving development out into the Eastern Mining District. The near-surface bedrock units are composed of sedimentary rocks of marine and non-marine origin. These sedimentary rocks were formed through the transgression and regression of an epicontinental sea 'and are comprised of sequences of sandstones, siltstones, shales and coal. Four geologic formations exist in the vicinity of the proposed Foidel Creek underground mine. They are, in ascending order, the Mancos Shale, the Iles and Williams Fork Formation of the Mesaverde Group, and the Lewis Shale (see Figures 3 and 4 of this document). These strata were all deposited during the late Cretaceous Period. Generally, the strata dip to the center of the basin at about 7~. Three economically important coal seams, the L.ennoz, Wadge, and Wolf Creek coals, are located within the locally important Middle Coal Group of the Williams Fork Formation. At this time, the Wadge coal seam is the only seam being mined in the Foidel Creek underground mine. The Wadge Coal seam was strip mined in CYCC's adjacent Energy No. 1 and Eckman Park Mines (No. C-81-071). 4