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<br />GENERAL <br /> <br />Macar Corporation's O. C. Mine No. 2 is located in Section 16, <br />Township 15 South, Range 86 West of the 6th Principal Meridian, <br />Gunnison County, Colorado. The area is characterized by sparse <br />vegetation, primarily scrub oak, on steep south-facing slopes. <br />The elevation of the mine site is approximately 9,200 feet. <br />HYDROLOGY <br />Precipitation values for .the 10-year, 24-hour and ZS-year, 24- <br />hour storms were taken from "Procedures for Determining Peak <br />Flows in Colorado" and "Urban Hydrology for Small Watersheds", <br />published by the Soil Conservation Service. Runoff values were <br />found in these publications using a Curve Number of 89, which <br />was taken as representative of the area. <br />Discharges used to design the various ditches were calculated <br />using the Peak Discharge (c.f.s. per inch of runoff) values from <br />Figure D-2 (see Appendix) and the runoff values determined pre- <br />viously. Ditch slopes will be modified by use of water bars <br />(cast-in-place concrete, grouted concrete block, grouted stone <br />or treated timbers) or 2 foot high drops to achieve velocities <br />of 5 feet per second or less. Ditch sections are shown in the <br />Appendix and on the endlosed drawing. <br />-1- <br />