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MORRISON-KNUCSSN COMPANY.MC. <br /> November 16, 1979 <br /> Page Two <br /> Regrading of the pad area is also required. The existing pond 4-1 <br /> will require largE nt to r.:eet sed;mkait and 10 year flood storage requi.r-- <br /> ments. <br /> The design of sedimentation pond (Plates 5-1 aand 5-2) at coal mine 5 .requires <br /> new construction of twv ponds and a network of ditches, berms-and swales with <br /> corrugated steel pipe to divert undisturbed area surface runoff from t`�e pad <br /> areas. <br /> Please call if you have any questions. (208) 335-6531, <br /> Sincerely, <br /> Ellery H. Wilson, P.E. <br /> Staff Engineer <br /> Geological Engineer <br /> EHW/gk <br /> Attachrents <br /> cc: Doug Bowman <br /> 41 <br />