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10/24/96 page 4 <br />SANBORN CREEK MINE <br />COAL WASTE BANK DESIGN <br />2.0-INCH 10 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 /> cfs min. cf\AcFt Acres <br /> <br />1 0.063 750 1021 cf 2.85 <br />2 0.363 725 972 cf 0.25 <br />3 1.962 735 6190 cf 4.18 <br />4 0.030 750 493 cf 1.38 <br />5 0.363 725 972 cf 0.25 <br />6 1.980 735 6534 cf 5.17 <br />7 3.942 735 12724 cf 9.35 <br />10 0.014 750 233 Cf 0.65 <br /> <br /> <br />