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The site is not affected by the potential of flooding from surrounding properties The predominate <br />drainage course found In the vicinity of the site is the Colorado Rwer, that flows adjacent to the southerly <br />Interstate 70 right-of-way The accompanying Flood Map indicates that the site is not prone to flooding in <br />the event of a 10D year frequency storm Stortnwater generated on the site is carried on the ground <br />surface in a "sheet flow" fashion to a drainage Swale adjacent to Interstate 70 that Is intercepted by a 38 <br />inch culvert which discharges into the Colorado Rver <br />Since the sand and gravel resource is located below ilia ground water elevation, pumping of the ground <br />water is necessary. Pumping will occur continually during resource extraction, It is antiapated that the <br />pumping rate will be In the range of 800 gallons per minute. Ground water will be pumped to the existing <br />drainage swale adjacent to Interstate 70 and ultimately discharged into the Colorado River. Discharge <br />and Well Permits will be obtained Irom the State of Colorado prior to exposing or pumping the ground <br />water <br />Mirong will be conducted m a manner that wdl not increase the discharged amount of surface stormwater <br />runoff above historic flows. Any storm water runoff entering the site will be captured wdhin the pit area <br />and allowed to evaporate or percolate into the ground. This Is accomplished by grading the site In e <br />fashion that will direct all stormwater flows to the excavated area Thus, eliminating any stormwater <br />discharges from the disturbed areas of the site In order to maintain the quality of any surface stormwater, <br />which crosses any exposed ground areas, a Storm Water Management Plan (SWMP), wdl be prepared, A <br />key element of the plan calls for grading the area in a manner that will not allow the discharge of any silt <br />laden storm water from the property In ilia event of a stone <br />