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OPERATIONS CONFIGURATION <br />Disturbed <br />Table 2 -2a -Runoff curve numbers for urban areas <br />Dirt - including right-of-way <br />Soil Type - Loarr <br />Curve Number <br />Disturbed <br />Table 2 -2a -Runoff curve numbers for urban areas <br />Impervious areas - streets and road; <br />Soil Type - Loarr <br />Curve Number <br />Coal Mine Waste <br />Direct <br />Table 2 -2d -Runoff curve numbers for and and semiarid rangeland: <br />Amount <br />Cover Type - Herbaceous -mixture of grass, weeds and brush <br />Vol A -F <br />Hydrologic Conditior <br />026 <br />Soil Type <br />1 8 <br />Curve Number <br />062 <br />RUN-OFF VOLUME - POND J <br />017 <br />Area Acres Curve # <br />Disturbed 516 <br />74 <br />Disturbed 9.81 <br />87 <br />Disturbed 4.70 <br />70 <br />Disturbed 114 <br />89 <br />Disturbed 020 <br />98 <br />Disturbed 218 <br />81 <br />Coal Waste 1679 <br />90 <br />TOTAL 3998 <br />TOTAL REQUIRED WATER VOLUME - - A -F <br />2.29 <br />SEDIMENT VOLUME - Pond J <br />Use the universal soil loss equation <br />A=RKLSCP <br />R = rainfall factor <br />K = soil erodibility factor - Work soil <br />LS = combined length slope factor 2000'- 5% <br />C = cropping management factor - Figure E <br />P = erosion control practice factor <br />A = sediment, tons/acre/yeas <br />THREE YEAR SEDIMENT VOLUME - ACRE FEET <br />39 98 ACRES - 115 #/CF <br />TOTAL REQUIRED SEDIMENT POND CAPACITY -- Al <br />TR -105 <br />Volume XI, App. B-4 <br />C <br />87 <br />C <br />98 <br />Poor <br />D <br />90 <br />Precip <br />Direct <br />Run-off <br />Amount <br />Run-off <br />Vol A -F <br />18 <br />026 <br />011 <br />1 8 <br />075 <br />062 <br />18 <br />017 <br />007 <br />1.8 <br />0.86 <br />008 <br />18 <br />158 <br />003 <br />1 8 <br />048 <br />009 <br />18 <br />093 <br />130 <br />229 <br />2.29 <br />30.00 <br />037 <br />0.23 <br />1 00 <br />1.00 <br />2.55 <br />0 122 <br />2.41 <br />09/15 <br />