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• ) INTRODUCTION <br />Sedimentation Pond 005 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 005 was redesigned and subsequently approved <br />by CMLRD. The remedial work was completed in August, 1987. <br />Sedimentation Pond 005 is located in Section 36 of Township 47 North, <br />Range 16 West, northwest of the town of Nucla (see Exhibit 13-15A). <br />SITE DESCRIPTION <br />LAND USE <br />Sedimentation Pond 005 has a 31-acre watershed that is tributary to <br />Tuttle Draw. This watershed is classified as approximately 58 percent <br />reclaimed and 42 percent undisturbed, upland sagebrush-grass. <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 an <br />18-inch diameter drop inlet corrugated metal pipe with a 1-incfi diameter <br />hole located at the 100 percent sediment storage level. <br />DESIGN ANALYSIS <br />GENERAL <br />Sedimentation Pond 005 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 005 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 (1.13 ac-ft.) <br />1 <br />