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The predominant drainage course found in the vicinity is the Kannah Creek, which is approximately 800 <br />feet north of the permit boundary and flows approximatety 160 feet below the site because of the creek <br />location, none of the disturbed areas on the site are within the flood plain. <br />The site is somewhat affected by the potential of flooding from properties from the east. An intermittent <br />drainage channel crosses the property entering near the center of the east property line and flows across <br />the site to the northwest property corner and ultimately to Kannah Creek. A drainage analysis is <br />presented on the following pages. The analysis indicates that the various stormwater conveyance <br />elements are property sized in the event of a major storm event. <br />Mining will be conducted in a manner that will not increase the discharged amount of surface stormwater <br />runoff above historic flows. Any stone water runoff entering the site will be captured within the pit area <br />and allowed to evaporate or percolate into the ground. In the event that any stortnwater remains in the <br />retention areas for more than 72 hours, the water will be pumped to the historic drainage channels. In <br />order to maintain the quality of any surface stormwater, which crosses any exposed ground areas, a <br />Stone Water Management Plan (SWMP), will be prepared. A key element of the plan calls for grading the <br />area in a manner that will not allow the discharge of any silt laden storm water from the property in the <br />event of a stone. Thus, eliminating any stormwater discharges from the disturbed areas of the site. This <br />is accomplished by utilizing a 4.5 foot high dike that surrounds the property. The dike will direct storm <br />water flows to sediment ponds <br />Water will be used on site when necessary to control dust in the mining area, during crushing operations, <br />and on haul roads. Water for dust control will be obtained from a tap on the existing water main located <br />north of Kannah Creek. Depending on climatic conditions, about 4,200 gallons of water per day will be <br />used for dust control during mining periods. <br />Rev. 05f18/04 <br />