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The permit area is not prone to flooding from adjoining properties or the two nearby Spring Creek and Alkali <br />Creek, both of which are intermittent drainage channels. The predominate drainage course found in the vicinity <br />of the site is the Eagle River, which is north of the permit boundary and flows approbmately 60 feet below the <br />site. A review of the Flood Rate Insurance Map for the area indicates, that none of the disturbed areas on the <br />site are prone to flooding by the river. <br />Mining is conducted in a manner that will not increase the discharged amount of surtace stormwater runoff <br />above historic flows. Any storm water runoff entering the sRe will be captured within the pit area and allowed to <br />evaporate or percolate into the ground. In order to maintain the quality of any surtace storm water, which <br />crosses any e>~osed ground areas, a Storm Water Management Plan (SWMP), has been prepared. The <br />Colorado Department of Public Health and Environment has issued a permit. A key element of the plan calls <br />for grading the area in a manner that will not allow the discharge of any silt laden storm water from the property <br />in the event of a storm. Thus, eliminating any stormwater discharges from the disturbed areas ofthe site. This is <br />accomplished by utilizing a 3 foot high dike adjacent to and above the river. The dike will direct flows to a <br />shallow swale and ultimately to the ebsting pond area on the property. A drainage analysis is presented on the <br />following pages. The analysis indicates that the various stormwater conveyance elements are property s¢ed in <br />the event of a major storm event. <br />Water is used on site when necessary to control dust in the mining area, during crushing operations, and on <br />haul roads. Water for dust control is obtained from the aforementioned pond. Water is also consumed for the <br />operation of the wash plant. The water supply for the consumptive uses is from ebsting water rights in the <br />Stremme and Gates Irrigation Ditch located on the property. Water is pumped from an erasting well adjacentto <br />the Eagle River and stored in the ebsting pond. Estimated ma>amum annual water requirements follow: <br />~ <br />USE ~ ~. <br />AC. FT. <br />PER YEAR <br />Sand and Gravel Washin 3.66 <br />Dust Control 6.54 <br />Concrete Production 1.84 <br />Truck Washin 0.45 <br />Pond Eva oration 3.98 <br />Domestic 0.06 <br />TOAL 16.55 <br />RECEIVED <br />DEC 2 22003 <br />Ci~rision of Minerals and Geology <br />Rev. 08/10/03 <br />