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Mined Land Reclamation <br />Re: Castle Concrete Company <br />Snyder Quarry X77-210 <br />• Peak runoff from the 50-year storm at 79.5 CFS for a two (2) h~~ur duration <br />would produce an estimated volume of 6.6 acre feet of water. If all of this <br />runoff reached the confinement area it would produce a pond approximately one (1) <br />foot in depth with an estimated surface area of 7 acres. Assuming ~j percolation <br />rate of one inch per hour and no evaporation, this runoff would dis,ippear in an <br />estimated 12 hours. This time would probably be reduced some due to evaporation. <br />This pond may temporarily inconvenience the actual mining operation, however, <br />with the retention of 100% of the storm runoff and processing water there will be <br />no affect on any adjacent surface or groundwater system. <br />B. The operation is not expected to affect ground water systems. <br />C. The project water requirements are as included herein. The de~ielopment phase <br />has had essentially no water requirement. The mining phase require; an estimated <br />2,000 to 3,000 gallons of water per day to be used in the processin~I plant and air <br />pollution control system. The reclamation phase will rely entirely on natural <br />• rainfall, no other water will be required. <br />D. The total project water requirements are 2,000 to 3,000 gallons of water <br />daily. This water is purchased from the City of Colorado Springs and obtained from <br />a City fire hydrant in the vicinity of the mine. The water is haul =d to the site <br />in a tank truck owned by the operator. <br />E. The NPDES permit is not required for this mining operation due to the zero <br />discharge nature of the mining operation. <br />-- ,.\ <br />~~ ~ ~ ~' ,~~~ 0 <br />. Roland G. Obering, P.E. R L.S., COLORADO 13226 <br />S-G-2 <br />