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E � <br /> q <br /> 4 <br /> Spy <br /> d <br /> kil <br /> Hydrologic Design of Mine <br /> Drainage and Sediment Ponds <br /> Technical Revision <br /> National King Coal Mine <br /> No. C-81-035 <br /> Durango, Colorado <br /> prepared by: <br /> Don R. May P.E. <br /> 735 E 7th Avenue <br /> Durango, CO 81301 <br /> September 1991 <br />