2003-12-15_REVISION - M1998014 (2)

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The permit area is not prone to flooding from adjoining properties or the two nearby Spring Creek and Alkali Creek, both of which are intermdtent drainage channels The predominate drainage course found in the vainRy of the site is the Eagle River, which is north of the permit boundary and flows appro>amately 60 feet below the sae, A review of the Flood Rate Insurance Map for the area indicates, that none of the disturbed areas on the site are prone to flooding by the river. Mining is conducted in a manner that wdl not increase the discharged amount of surface stormwater runoff above hrstonc flows Any storm water runoff entering the site will be captured within the pA area and allowed to evaporate or percolate into the ground In order to maintain the quallry 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 permit A key element of the plan calls for grading the area in a manner that will not allow the discharge of any silt laden storm water from the property m the event of a storm Thus, ehm mating any stormwater discharges from the disturbed areas of the srle. Thus a accomplished by uUl¢ing a 3 foot high dike adjacent to and above the rarer. The dike wdl direct flows to a shallow swats and ultimately to the ewsbng pond area on the property A drainage analysis is presented on the following pages, The analysis indicates that the various stormwater conveyance elements are property s¢ed in the event of a major slol'm event Water rs used on sde when necessary to control dust in the mining area, during crushing operatrons, and on haul roads. Water for dust conUol is obtained From the alorementbned pond Water is also consumed for the operation of the wash plant, The water supply for the consumptive uses rs from ewsting water nghts in the Stremme and Gates Irrgation Ditch located on the property Water is pumped from an ewstng well adjacent to the Eagle Rroer and stored in the e>esting pond Estunated ma>omum annual water requirements follow. • • AC. FT. USE PER YEAR ` i ',~' ~_ t Sand and Gravel Washing 3 66 Dust Control ; _ 6 ~ 164 DEC 11~n~ w<h7 Concrete Produc_tio_n Truck Washing 0 45 Pond Eva oration 3 gg ~~ ~.~on ar Minnrdi anJ C~olopy Domestic 006 _ TOAL 16.55 i.,~.• View of the evsring water storage and sediment pond. Rnv 08n 0107