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a co:nbined storagI :a;i•t': i is}' 1 I .3? 3:re-feet, of which 0.64 acre-feet is <br /> for storage of runoff Fran a lu-year, 24-hour storm, 0.56 acre-feet is <br /> for sediment storage, and 0. 12 acre-feet is excess storage capacity. <br /> Both ponds are designed to have 6-inch CMP principal spillways and 36 <br /> inch CMP emergency spillways capable of passing the peak Flow from a <br /> 25-year, 24-hour stir a. <br /> Once the two-year coal processing is completed, an additional pond will <br /> be constructed. Once this pond is completed, the h��r to �, ponds will no <br /> longer be needed and kill eventual CA <br /> 0_A p cess ' <br /> waste 'The third pon is designed to have a capacity o acre-feet, <br /> o which 1 .25 acre-feet is for sediment storage, 1 .60 acre-feet is for <br /> storage of the runoff from a 10-year, 24-hour storm, and 0.29 acre-Feet <br /> is for excess storage capacity. The pond is designed to have a 6 inch <br /> Ci4P principal spillway and a 36 inch DIP emergency spillway capable of <br /> passing the peak flow from a 10-year, 24-hour storn. <br /> All three of the sediment ponds are designed with principal spillways <br /> located at the top of the runoff store-je. level . ;.05.6 requires <br /> that pond designs provide for a "non-clogging dewatering device or <br /> conduit spillway to remove water storage resulting from inflow". In <br /> order to maintain storage for runoff From a 10-year, 24-hour <br /> precipitation event, tijo� ;principal dewatering device must be. located <br /> directly above the maximum sediment storage level . Therefore, the <br /> following stipulation is necessary: <br /> Stipulation No. 3 <br /> WITHIN 30 DAYS OF PERr4IT ISSUANCE, THE PERMITTEE MUST REVISE THE <br /> SEDIMENT CONTROL PLANS FOR THE THREE PROPOSEU SEDIMENT PONDS AT TH" <br /> SITE OF THE NEW COAL PROCESSING HASTE E43ANKMENT. THE PLANS MUST b <br /> BE REVISED TO INCLUDE A NON-CLUGGING, GATED DEWATERING DEVICE Y, <br /> - LOCATED DIRECTLY ABOVE THE MAXIMUM STJI?AGE I_r'/rl_ 7F EACH POND. <br /> Control - General <br /> Sediment Co <br /> Rule 4.05.6(7) requires that a certification from a registered �� C <br /> professional engineer, certifying that the sediment ponds have been `. <br /> constructed as designed, be submitted to the Division. The applicant hasS <br /> not submitted the required certification. Therefore, the following <br /> stipulation is necessary: <br /> Stipulation No. 4 t <br /> WITHIN SIX 'MONTHS OF PkRMIT ISSUANCE, THE PERMITTEE SHALL SUI3MI <br /> THE DIVISION CERTIFICATION FROM A REGISTERED PROFESSIONAL EN(3I14EER, <br /> ITTLST'NG THAT fHE ScJI'•1t:,1f Pi)iJi)S I' S='iTl.f ;;JNSTRUCTl:U HAVE SEEN <br /> BUILT AS DESIGNED. CERTIFiCATIUN OF THOSE PONDS YET TO BE <br /> CONSTRUCTED MUST BE SUBMITTED i••1f,1EJiATELf FOLLOWING CONSTRUCT10i <br /> . � !4 G <br />