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GoodMiller #2 Pit 112c Permit <br />WATER INFORMATION <br />Surface Water General Discussion <br />EXHIBIT G <br />The surrounding area of the GoodMiller #2 pit is dry rangeland. No active drainages or ditches <br />exist within the permit area. Surface water will be limited to storm water control. <br />Stormwater Management Concepts <br />The general plan for controlling stormwater on site is to prevent undisturbed runoff from entering <br />the pit and direct runoff from the pit slopes to the pit floor and allow it to infiltrate to the <br />groundwater. The entire site drains to the bottom of the pit. Berms and ditches will be maintained <br />during the operation to ensure all water from within the active disturbed area flow into the pit. <br />Existing terrain and the ditch along CR115 limit the inflow of water from outside the site. Water <br />will directed by ditches within the pit to catchments in order to maintain a dry pit floor. <br />The 100 -YR 24 -HR event for this area is 4.56 inches. The stormwater sediment sumps will be at <br />least three feet deep, and the stormwater berms will be at least six feet tall. These will be more <br />than sufficient to contain the 100 -YR 24 -HR event on site. <br />Maintenance of Best Management Practices <br />The BMP's for this operation are the contemporaneous reclamation of the slopes and installation <br />of small catchments within the pit bottom. All catchments will be designed to allow evaporation <br />or infiltration of the water within 72 hours. <br />Stormwater Management Plan Application <br />A Discharge Permit is not required for this site through the Colorado Department of Public Health <br />and Environment because there will be no discharge, since there will be no runoff for the 100 year <br />event. The Stormwater Management Plan is a sub part of this permit and is therefore also not <br />required. <br />GoodMiller #2 Pit Dec 2014 G -1 <br />