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Peabody Sage Creek Mine — Drainage and Sediment Control Plan <br />TABLE 2.05.3 -E2 -12 <br />Postmine Culvert Schedule <br />Culvert No. <br />Design Peak <br />Discharge <br />cfs <br />Design Diameter <br />(inches) <br />Diameter Installed <br />(inches) <br />2A & 2AA <br />2.8 <br />10 <br />30 <br />9A <br />65.3 <br />48 <br />48 & 24 <br />12A <br />1.5 <br />8 <br />30 <br />13A <br />3.0 <br />18 <br />18 <br />15A <br />72 <br />72 <br />29A <br />6.9 <br />30 <br />30 <br />30A <br />7.1 <br />30 <br />30 <br />31A <br />1.3 <br />18 <br />18 <br />32A <br />3.6 <br />24 <br />30 <br />33A <br />1.4 <br />18 <br />18 <br />45A <br />0.3 <br />4 <br />18 <br />47A <br />0.7 <br />24 <br />24 <br />62A <br />0.2 <br />4 <br />24 <br />Al <br />0.9 <br />24 <br />24 <br />A3 <br />5.4 <br />30 <br />30 <br />A4 <br />0.6 <br />12 <br />18 <br />A5 <br />0.5 <br />6 <br />30 <br />A8 <br />0.9 <br />24 <br />24 <br />SC -10 <br />5.2 <br />30 <br />36 <br />SC -11 <br />2.0 <br />12 <br />24 <br />SC -12 <br />12.1 <br />12 <br />24 <br />Table 2.05.3- E2 -13, Permanent Postmine Stock Tanks, lists the 13 stock tanks located in <br />the previously reclaimed surface mine areas. <br />TABLE 2.05.3 -E2 -13 <br />Permanent Postmine Stock Tanks <br />T -3, T -4, T -8, T -16, T -17, T -20, T -26, T -28, T -29, T -30, T -31, T -32, T -33 <br />The locations of permanent stock tanks are shown on Map 2.05.4 M1, Postmine <br />Topography. As -built SEDCAD demonstrations and certified drawings of the stock tanks <br />are presented in Appendix 2.05.3 -E2.I, Stock Tank As -Built Reports. <br />All stock tanks are located in reclaimed areas and are not primary sediment control <br />structures. They relatively small with a storage capacity of not more than two (2) acre -feet <br />and an embankment height no greater than five (5) feet measured from the invert of the <br />spillway to the upstream toe of the embankment. The combined slope of all embankment <br />will be less than 5H:1 V with no slopes greater than 211:1 V. <br />All stock tanks were constructed with a single open channel spillway designed to safely pass <br />a 25 -year, 24 -hour precipitation event. The spillway is configured with a minimum of one <br />TR -01 2.05.3 -E2.24 Revised 04/12 <br />4 <br />