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INTRODUCTION <br />Sedimentation 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 the Nucla <br />Mine. Sedimentation Pond 004 is located in Section 31 of Township 46 <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. 004. The purpose of this <br />inspection was to assess the safety and general condition of the structure <br />with respect to the regulations of the Colorado Mined Land Reclamation <br />Division (CMLRD). Asa result of this inspection, it was determined that <br />the storage capacity of No. 004 was inadequate and there was no <br />nonclogging, dewatering device. It is Peabody's intention to repair these <br />• deficiencies in accordance with the remedial compliance plan contained in <br />this report. <br />SITE DESCRIPTION <br />LAND USE <br />Sediment Pond No. 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. 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 />~~ <br />1 <br />