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Mining will be conducted in a manner that will not fnaease the tlisCharged amount of surface stonnwater <br />runoff above hlSloriC flows. A drainage analysis is presented on the following pages. The analysis is <br />limAed to the exishng drainage basin Ihat discharges into an existing 24 inch diameter culvert below <br />Interstate 70 and compares the historic stormwater discharge flows with the flows that will result after <br />mining has begun Most of the stone water generated on the site will be captured within the pit area and <br />allowed to evaporate or percolate into the ground <br />In order to maintain the quality of any surface stormwaler, which crosses any exposed ground areas, a <br />Stone Water Management Plan (SWMP), has been prepared. A key element of the plan Calls for the <br />implementation of several structural and non-structural components that will not allow the discharge of <br />any silt laden storm water from the property in the event of a storm The structural compGne,~ts that will <br />be incorporated are Illustrated on ExhlWl C, sheet two herein. ~ .• " '~'r •i~ <br />Rw.03~ON0e 7 <br />The site is not afleded by the potential of Gooding from surrounding properties. The predominate <br />drainage course found in the vicinity of the site Is the Colorado River, that flows adjacent to the southerly <br />Interstate 70 right•of-way. The accompanying Flood Map indicates that the site is not prone to Hooding in <br />the event of a 100 year frequency storm. Stormwater generated on the site is tamed on the ground <br />surface in a "sheet Hov/ fashion to a drainage Swale adjacent to Interstate 70 that is intercepted by two <br />36 inch culverts which discharge Into the Colorado River. <br />