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INTRODUCTION <br /> Sediment 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 the Nucla <br /> Mine. Sediment Pond 005 is located in Section 36 of Township 47 North, <br /> Range 16 West, Northwest of the town of Nucla, Colorado (see Exhibit <br /> 13-4) . <br /> INSPECTION <br /> On July 8, 1986, engineers from Peabody's Compliance Engineering <br /> Department inspected Sediment Pond No. 005. The purpose of this <br /> inspection was to assess the safety and general condition of the <br /> structure with respect to the regulations of the Colorado Mined Land <br /> Reclamation Division (CMLRD). As a result of this inspection, it was <br /> determined that the storage capacity of No. 005 was inadequate. It is <br /> Peabody's intention to repair these deficiencies in accordance with the <br /> remedial compliance plan contained in this report. <br /> SITE DESCRIPTION <br /> LAND USE <br /> Sediment Pond No. 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 . The top width of <br /> the embankment is a minimum 12 feet wide with upstream and downstream <br /> slopes of approximately 2H:1V, respectively. The existing spillway <br /> consists of an 12-foot wide, trapezoidal channel . <br /> 1 <br />