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INTRODUCTION <br />• Sediment Pond 004 is an earthen embankment structure constructed by <br />Peabody Coal Company in the mid-1970's as a temporary sediment structure <br />to control runoff and sediment from the disturbed areas of Nucla Mine. <br />In 1986, Sedimentation Pond 004 was redesigned and subsequently approved <br />by CMLRD. The remedial work was completed in November, 1987. Sediment <br />Pond OU4 is located in Section 31 of Township 46 North, Range 15 West, <br />northwest of the town of Nucla (see Exhibit 13-14A). <br />SITE DESCRIPTION <br />LAND USE <br />Sediment Pond 004 has a 6.3-acre watershed that is tributary to Tuttle <br />Draw. This watershed is classified as approximately 100 percent <br />reclaimed. <br />EMBANKMENT <br />• The existing embankment is a homogeneous earth fill compacted in lifts <br />to design specifications. The top width of the embankment is <br />approximately 12-feet wide with upstream and downstream slopes of <br />approximately 3h:ly, respectively. The existing spillway consists of a <br />12-inch diameter drop inlet corrugated metal pipe with a 5/8-inch <br />diameter hole located at the 100 percent sediment storage level. <br />DESIGN ANALYSIS <br />f:FNFDAI <br />Sedimentation Pond 004 was evaluated and constructed to meet or exceed <br />the design and performance requirements of the Colorado Mined Land <br />Reclamation Division while utilizing as much of the existing structure <br />and topography as possible. Sedimentation Pond 004 was constructed to <br />adhere to the following specifications: <br />1. Provide storage for the runoff from the 10-year, 24-hour storm <br />• event without experiencing any discharge through the emergency <br />spillway (0.19 ac-ft.). <br />1 <br />