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<br />• blu•face runoff on ttie permit area (disturbed ruins bench) is <br />collected via the drainage channels and hurried pipes into a future <br />suiiment pond. <br />The sediment pond will tia.ve constructed outlets or spillways. <br />They will be constructed of eighteen inch diameter culvert pipe and <br />boxed in with concrete to prevent erosion of the pond enba~ulanent. <br />By regulation, the ruining company must manage water expected <br />in a 'l4-hour storm event predicted to occur once every ten years. The <br />National Oceanic and Atmospheric Precipitation Frequency Atlas of the <br />Western United States -Colorado predicts the 10-year 24-hour <br />precipitation event at the mine sites to be 2.25 inches. <br />SUli-SUkI•'ACE HYD1tOIIJGY <br />• Blue flame Coal Company has not encountered groundwater during <br />the course of normal mining operations for process water. <br />ABU i FFISS <br />The Blue Flame Coal Aline is not in a major groundwater <br />recharge area. According to a document by "Hydro-Search Inc.," this <br />portion of the basin has had very limited groundwater development. Most <br />of tlxe wells in the general area have been completed in the <br />unconsrolidated alluvial gx•avels and terrace or deposits of tlue La Plata <br />- 2 - <br />• <br />