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10/24/96 page 4 <br />SANBORN CREEK MINE <br />• COAL WASTE BANK DESIGN <br />2.4-INCH 25 YEAR, 24 HOUR STORM EVENT <br />- ------------------------------------------ <br />HYDROGRAPH SUMMARY <br /> PEAK TIME VOLUME <br />HYD RUNOFF OF OF Contrib <br />NUM RATE PEAK HYDRO Area <br /> <br />------ cfs <br />----------- min. <br />------- cf\AcFt <br />------------ Acres <br />--------- <br />------ <br />1 ----------- <br />0.311 ------- <br />735 -------- <br />2125 ---- <br />cf --------- <br />2.85 <br />2 0.476 725 1281 cf 0.25 <br />3 2.825 735 8927 cf 4.18 <br />4 0.151 730 1029 cf 1.38 <br />5 0.476 725 1282 cf 0.25 <br />6 2.937 735 9669 cf 5.17 <br />7 5.762 735 18596 cf 9.35 <br />10 0.070 735 485 Cf 0.65 <br /> <br /> <br />