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• WESTERN SLOPE FLAGSTONE <br /> QUARRY NO. 2 <br /> STORM WATER MANAGEMENT PLAN <br /> A. SITE DESCRIPTION <br /> Western Slope Flagstone Quarry No. 2 is located North of the crest of a ridge separating <br /> Rapid Creek drainage basin and the Colorado River drainage basin. The site slopes <br /> Northerly at approximately 6.5%. Run-off from the site would be transported into a <br /> normally dry wash which flows in a Northerly direction passing under Interstate 70 <br /> Highway and into the Colorado River. Run-off occurs only during periods of snow melt <br /> and high intensity rainfall. <br /> INGRESS/EGRESS for the site is along existing roads which originates from the old 6 & <br /> 24 paved highway bed which lies South of and parallel to 1-70's East bound lane. The <br /> • road then passes through property owned by Powderhom Coal and Rudy Fontanari, the <br /> applicant, along and crossing the same dry wash which would transport any run-off from <br /> the mining site. Most sections of the haullaccess road which could be subject to erosion <br /> from the storm water run-off have been diverted by water bars and erosion control berms <br /> into detention basins or check dams to detain or retain storm water run-off. Periodic <br /> maintenance of the access road will be performed throughout the life of the quarry to <br /> keep the storm water control devices functional. <br /> B. REDUCTION OF POLLUTANTS <br /> The mining plan calls for extraction of rip/rap over a 20 year period. All mining activity, <br /> extracted materials, equipment maintenance and fueling will be inside the perimeter of <br /> diversion ditches. The diversion ditches will carry all storm water generated on site to a <br /> retention pond. The retention pond will be constructed from overburden and topsoil from <br /> Phase 1. The retention pond embankments will be sloped at a maximum 3:1 slope and <br /> • reseeded with rangeland grasses to prevent or minimize wind and rain erosion. Potential <br />