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I I I I I I I I I I I I I I I I I I I (3) Fish and Wildlife: Fossil Creek Reservoir is not presently a production fishery, but is a very excellent area for water fowl. The extensive shoreline provides refuge for vast numbers of ducks, geese and other fowl. (4) Recreation: The use of the reservoir area for recreation has been recently increasing, including boating, camping and water skiing. (5) Water quality control: The facility does not contribute to the degradation of water quality, and substantially improves water quality on the river by receiving effluent from sewage treatment plants. (6) Drainage: The reservoir is on Fossil Creek and does not return water to the natural stream. It receives runoff from approximately twenty-eight square miles of drainage basin. b. Geologic investigations. The dam foundation is based on Pierre Shale which varies from dense shales to medium sandstones. No known active faults are adjacent. Extensive soils tests have been performed on the overburden of sandy clays, clays, and clay sands. The preliminary report dated April 1981, prepared by BRUNS Incorporated includes soils reports completed by Empire Laboratories of both the spillway area and potential borrow area. In addition, in 1975, the existing embankment and foundation areas were drilled and tested. A copy of that report in included as Appendix "B" to this report. c. Design. improvements references: The design criteria used to establish the proposed to this reservoir were taken from the following 1. Design of Small Dams; Bureau of Reclamation 2. Colorado State Engineer's Office 3. Generally accepted practices in the profession. The normal high water line of the reservoir was established at 35.5 feet gage rod, as measured from the highest point in the invert of the outlet works to restore the high water line to the original decreed depth. This decree allows for storage of 13,597 acre-feet of water. The spillway of the structure was designed for the Probable Maximum Precipitation Inflow Design Flood. This was established -15- .