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<br />upstream drainage areas. Pond ooi and proposed pond 007 will <br />also be used to store water from the pit dewatering <br />activities and surface-water runoff control ditches around <br />the mine pits. Water for dust suppression and for use as <br />construction compaction make-up water will be pumped from <br />these ponds as needed. <br />It is our understanding that the ponds were designed to <br />satisfy Colorado M1ned Land Reclamation Division (CMLRD) and <br />the Environmental Protection Agency (EPA) requirements with <br />respect to overall capacity, pollution and sediment control, <br />and flood routing. Each pond has an emergency spillway and a <br />principal spillway of corrugated metal pipe, with the inlet <br />• at an elevation correspondin4 to the maximum sediment <br />storage or dea8 storage volume. The 'principal spillway is <br />intended to automatically dewater the pond to the level of <br />the inlet. To release water below the level of the input <br />,would require pumping. <br />As designed, these ponds may allow water to be stored <br />and potentially used out-of~priority. To prevent impact to <br />downstream users, PCC will commit to dewatering the ponds <br />below the level of the principal spillway inlet with a non- <br />clogging pump whenever a call is made downstream for the <br />water stored out-of-priority. Discharges will be made in <br />compliance with CMLRD and EPA requirements. <br />25 <br />,r ~f <br />u <br />GEOTRANS, INC. <br />REVISED MARCH 2006 Attachment 2.05.6(3)(b)(v)-1-30 <br />