2004-02-04_REVISION - M1998014 - Laserfiche WebLink

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The permit area rs not prone to flooding from adjoining properties or the two nearby Spring Creek and Alkali Creek, both of which are inlermdfenl drainage channels The predominate drainage course found in the vicinity of the site is the Eagle River, which is north of the permit boundary and flows appro>amately 60 feet below the site A review of the Flood Rate Insurance Map for the area ~ndreates That none of the disturbed areas on the sde are prone to flooding by the river Mining rs conducted in a manner that will not increase the discharged amount of surface stormwater runoff above historic flows. Any storm water runoff entering the site wdl be captured within the pd area and allowed to evaporate or percolate into the ground In order to maintain the quafrry of any surface storm water, which crosses any e~osed ground areas, a Storm Water Management Plan (SWMP), has been prepared The Colorado Department of Public Health and Environment has issued a perms A key element of the plan calls for grading the area in a manner that wdl not allow the discharge of any Srlt laden storm water from the property in the event 01 a storm Thus, elRninating any stormwater discharges from the disturbed areas of the site This is accomplished by duecung Bows towards one e>osbng and one future pond areas on the property. A drainage analysis rs presented on the following pages. The analysis indicates that the varqus stormwater conveyance elements are property s¢ed m the event of a mafor storm event. Water is used on site when necessary to control dust in the mining area. during crushing operations, and on haul roads. Water for dust control rs obtained from the aforementbned pond Water rs also consumed for the operatbn of the wash plant Water a pumped from a well adjacent to the Eagle River and srored in the e>as6ng pond According to the Ruling o/ fhe Reforee and Decree of the Court, which can be found at the end of this exhibit, eshmated manmum annual water requirements for the Gypsum Ranch are Rev Otfn urCJ Oin: r0a 01;?7'04 • • USE AC. FT. PER YEAR Sand and Gravel Washing 5 052 _ Dust Control 6 520 Concrete Production 11 048 Truck Washing 0654 Pond Evaporation 1.3 383 Domestic 0.026 TOTAL 37 523