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• INTRODUCTION <br />Sedimentation Pond 002 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. Sedimentation Pond 002 is located in Section 31 of Township 47 <br />North, Range 15 West, Northwest of the town of Nucla, Colorado (see <br />Exhibit 13-4). <br />INSPECTION <br />On July 8, 1986, engineers from Peabody's Compliance Engineering <br />Department inspected Sediment Pond No. 002. 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. 002 was inadequate and there <br />was no nonclogging, dewatering device. It is Peabody's intention to <br />• repair these deficiencies in accordance with the remedial compliance <br />plan contained in this report. <br />SITE DESCRIPTION <br />LAND USE <br />Sediment Pond No. 002 has a 7.69-acre watershed that is tributary to <br />Tuttle Draw. This watershed is classified as approximately 96 percent <br />reclaimed and 4 percent undisturbed juniper-grassland. <br />EMBANKMENT <br />The existing embankment is a homogeneous earth fill. The top width of <br />the embankment approximately ten feet wide with upstream and downstream <br />slopes of approximately 2H:1V, respectively. The existing spillway <br />consists of an 11-foot wide, trapezoidal channel. <br />• 1 <br />