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upstream drainage areas. Pond Dot and proposed pond 007 will <br />also be used to store eater from the pit devaterinq <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 eater vill be pumped from <br />these ponds as needed. <br />Zt is our understanding that the ponds were designed to <br />satisfy Colorado Mined 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, vith the inlet <br />at an elevation corresponding to the maximum sediment <br />~i storage or dead storage volume. The principal spillvay, is <br />• intended to. automatically ~dswater the pond to the ~~level of <br />the inlet. To release eater belov the level of the input <br />vould require pumping. <br />As designed, these ponds may allow eater 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 sp111vay inlet with a non- <br />clogging pump whenever a call is made downstream for the <br />eater stored out-of-priority. Discharges will be made in <br />compliance with CMLRD and EPA requirements. <br />25 <br />GEOTMItS. u/r <br />REVISED MARCH 2006 Attachment 2.05.3(3)-16-70 <br />