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B. Description of Property ' 1. Area. Centennial Materials, Inc. (CMI) has leased ],828 acres of land from the Winkler Cattle Company. Through their Douglas County UBSR permit application, CMI is currently requesting permission to use 591 acres of the lease area for mining and mining ' setbacks. Of the UBSR azea, approximately 442 acres is proposed for mining over the life of the operation. Notably, the maximum amount of disturbance at any one time will ' only be 60 acres. This 60 acres includes all excavation and processing areas. 2. Ground cover. The current ground cover consists of a variety of grasses, forbs, and ' shrubs. The following is a list of species identified by the United States Department of Agriculture Soil Conservation Service (SCS): ' Grasses Blue Grama, Red Three Awn, Westem Wheatgrass, Prairie Junegrass, Sedges, Little Bluestem, Bluegrass, Cheatgrass, Needle and Thread, and Sleepy Grass. Forbs and shrubs Snakeweed, Fringed Sage, Pussy Toes, Hairy Goldstar, Cactus, Wormwood Sage, ' Louisiana Sage, Westem Yarrow, Oyster Plant, and Musk Thistle. ' The SCS has identified the soil on the property as a Fondis clay loam (FoB). The SCS states that areas with this soil typically have one to three percent slopes. They also note that runoff from this soil is medium, and erosion potential is slight to moderate. ' The topography of the upland area gently slopes (about 2%to 3%) to the northeast. The grade of the topography is expected to be similar to that of the rhyolite deposit and the ' underlying Dawson Formation (sandstone and shale). 3. All drainageways. On the east side of the property, where the crushed stone quarrying ' will occur, several small drainageways drain the upland azea to Cherry Creek. On the west side, where the cut stone quarrying will occur, several small drainageways similarly connect the upland area with Willow Creek. Willow Creek flows into Cherry Creek about two miles north of Castle Rock Quarry. A small portion of W illow Creek passes through the west side of the UBSR permit azea. Significantly, the creek does not pass through the actual mining area itself. The mine access road will cross Willow Creek (see Figure A), as discussed later in this report. 4. General project descriprlon. CMI plans to mine a portion of a rhyolite deposit (geologically named the Wall Mountain Tuff) located 2 %: miles southeast of Castle ' Rock. They will call this site Castle Rock Quarry. The Castle Rock Quarry ryholite deposit will replace their current rhyolite deposit (known as the Ditmar Quarry), located adjacent to the Town of Castle Rock. The applicant proposes to commence mining of the ' Castle Rock Quarry rhyolite deposit in the spring of 1996. 1 i 1