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<br />The current (second) permit renewal process was initiated by the <br />Division's 270-day letter to CYCC informing them that a renewal <br />application was due by June 14, 1992 to guarantee the right to <br />successive renewal. CYCC submitted a complete renewal application <br />on June 14, 1992. The Division notified the appropriate agencies <br />on June 26, 1992 and forwarded preliminary adequacy questions to <br />CYCC on August 18, 1992. CYCC responses were received November <br />18, 1992. These responses were reviewed and on January 19, 1993 <br />the Division made the decision to renew a valid existing permit. <br />Description of the Environment <br />The CYCC operations currently permitted under permit # C-81-071 <br />are located 20 to 25 miles southwest of Steamboat Springs in <br />Routt County, Colorado. The proposed permit area varies in <br />elevation from 6,600 feet in the eastern portion of the area <br />along Foidel Creek to over 8,200' in the southwestern part of the <br />proposed permit area. The topography is dominated by long gentle <br />slopes formed by uplifted strata of mainly Cretaceous age strata, <br />with prominent cliffs occurring where massive sandstone units out <br />crop. Flatter topography resulting from alluvial deposition is <br />evident in the valleys of Fish Creek, Foidel Creek and Middle <br />Creek, which are the major drainages in the permit area. <br />The proposed permit area lies on the south end of the regionally <br />significant Sand Wash structural basin. Locally significant are <br />the rock units of the Twentymile Park Basin, which dip 5°-30° <br />toward the center of the basin. Normal faulting has been <br />identified throughout the permit area, trending northwest to <br />southeast, with displacement of zero to 85 feet. A reverse fault <br />trending northward through the west central part of the basin <br />displays displacement of 0-80 feet. <br />The geology of the area is composed of sedimentary rocks of <br />marine and non-marine origin. These sedimentary rocks were <br />formed through the transgression and regression of an <br />epicontinental sea during the Cretaceous Period and are comprised <br />of sequences of sandstones, eiltstones, shales and coal. <br />Four geologic formations exist in the vicinity of the proposed <br />permit area. They are, in ascending order, the Mancos Shale, the <br />Iles and Williams Fork Formations of the Mesaverde Group, and the <br />Lewis Shale (Figures 1 and 2). These strata were all deposited <br />during the late Cretaceous Period. The strata dip to the center <br />of the basin, at approximately 7 degrees. <br />Rock units and thicknesses from oldest to youngest are: <br />1. Trout Creek Sandstone (50-100') - fine grained, massive <br />sandstone; <br />5 <br />