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DF,SMCN <br /> General <br /> The sedimentation and L-ainage control struct:=es have been designed and <br /> const=ted Li accordance with Colorado Mined Land I.Reclmation Board requirements <br /> and with Office of Surface Ydr.e regulations (Federal Register, March 1979) <br /> General design criteria that apply to all sedimm ation ponds, dams <br /> and appurtenant marks,ie spi.11..-ays and cutlet marks; are described herein. <br /> Pond capacities have been determi ed by storage of the entire sed wnnt <br /> volume generated over 3--year period and the ent-ire ruu.-ioff volum generated by <br /> a 10-year 24-1-our design story. (Type II, SCS) <br /> Emergency spillways have been designed to permit- 100 per cent peak discharge <br /> of a 25-year 24=Hour design Type II Storm (SCS) . <br /> All outlet works will be 6 inch diameter gated corrugated r.�tal pipe that <br /> are located above the maxims sedir --nt storage pool. <br /> arIx ^�-nt fill sectiorLs are to be constracr_ed to a density tY'at is 95 <br /> per cent of the standard proctor density within 2 per cent of the cpti= <br /> mist-Lire content i_r acco;dmce w/A.ST%! D-698. Subgrade soils n3ast be stripped <br /> and cleared prior to fill placenent. ' Native soils or, stem slope must be. benched <br /> before fill plaYeme:it. Fill r;.st be placed in horLzorta1 1 ifts riot less than <br /> S inches or in excess of 10 inches corpacted thi_c -es;��. Rock particles large,: <br /> t-kui 6 inches L,-,st be removed or broken u? before placev -nt and c,:�.)acted, veg- <br /> etated or ripraped as required. <br /> All discharge ;points for spillways and outlet work rra.1.st be protected by 1 to <br /> 2 feet t1h ck riprap layer. The sized riprap uust rdrge -c 3 inches to 12 inches <br /> in di=,eter. Riprar) sand Ledding 1 foot truck shall be placed prior to rock f it l <br /> emergency spillways sI''.a_Ll be crost=Lcted of aalv2:n!-- —.d steel, 16 "a�e t h ck- <br /> - c <br /> ness or ecual. Galvanized steel or e i-: ! a-,toff collars 4' by 4' shall be placed <br /> on 15' centers. <br /> -4-4 6 <br />