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iii iiiiiiiiiiiu iii <br />fI~~CI~CiJ <br />October 4, 1992 <br />OCT 0 71992 <br />DIVISION OF <br />Harry Ranney MINERALS R GEOLOGY <br />Reclamation Specialist <br />Mined Land Reclamation Division <br />Colorado Dept. of Natural Resources <br />1313 Sherman St. Room 215 <br />Denver CO 80203 <br />RE: Explanation of pond spillway locations at King Coal Mine, <br />Durango. <br />Dear _Mr,_ Ranney1 _ __ <br />After your last inspection at National King Coal mine you asked <br />me to addres~e the reasons for constructing the overflow spillway: <br />on both the east and west sediment ponds at locations different <br />from those shown on the plans. I have reviewed my original design <br />document submitted to MLRD ar,d did not find any reference to a <br />prescribed location for the spillways. The reason for this is <br />that it doesn't matter where they are put as long as they are <br />constructed as shown in the design. <br />The most effective location for the west pond spillway is <br />anywhere along the north embankment. King Coal chose to locate it <br />near the west side of the north embankment. Similarly, the most <br />obvious location for the east pond spillway is along the north or <br />east embankment which is where it is lor_ated. This is adjacent to <br />the field where the overflow water will ultimately spill. <br />The same assessment is true for the low flow outlets. In this <br />case the critir_al consideration is not horizontal but vertical <br />location. They need to be located at elevations adequate to drain <br />the ponds. <br />Upon review I believe that the location of the spillways as <br />constructed are just fine. I apologize for any confusion due to <br />ambiguity in the design. If you have any question please call. <br />Sincerely, <br />~~ <br />Don R. May P.E <br />Projer_t Engineer <br />735 East 7th Ave. <br />Durango CO 81301 <br />385-7504 <br />ropy: National King Ccal <br />