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TAB~:I ~i <br />ITEM UNITS SEDIMENTATION PONDS <br />` PONDNAME <br />WATERSHED AREA PROSPECT ? WEST PIT <br />PRE-MINING Acre 905 1379 <br />POST-MINING <br />Disturbed Acre 698 1 i 83 <br />Undisturbed Acre 183 220 <br />Total Acre 881 1403 <br />PRECIPITATION <br />10 Yr. 24 Hr. Inches 1.8 1.8 <br />25 Yr. 24 Hr. Inches 2.3 2.3 <br />Runoff Curve Number CN 63 63 <br />Runoff Volume 10 Yr. Acre-Feet 4,5 7.0 <br />Sediment Yield Volume 10 Yr. Acre-Feet 0.2 0.4 <br />Total Volume Acre-Feet 4.7 7.4 <br />Stora a Volume Below <br />Emer enc S illwa Acre-Feet 6.5 12.1 <br />POND ELEVATIONS <br />Bottom of Pond <br />Gate Valve <br />Prince I S illwa Elevation <br />Elevation <br />Elevation 6726 <br />6732 <br />6742 6821 <br />gg2g <br />6837 <br />Emer enc S illwa Elevation 6743 6838 <br />To of Embankment Elevation 6745 6840 <br />HEIGHTS <br />Bottom of Pond to Gate Valve <br />Gate Valve to Princi al S ilp Iwa Feet <br />Feet g <br />10 7 <br />g <br />Prins al S illway to Emergenc~S illwa Feet 1 1 <br />Emer ency Spillway to Top of Embankment <br /> <br />Total Feet <br /> <br />Feet 2 <br /> <br />19 <br />2 <br />i 9 <br />PRINCIPAL SPILLWAY <br />T e - Corru sled Metal Pie Corru sled Metal Pi e <br />Diameter inches 12 i8 <br />EMERGENCY SPILLWAY <br />De th <br />Len th <br />25 Yr. H.W.L. Feet <br />Feet <br />Elevation 15 <br />15 <br />6743.7 20 <br />60 <br />6839.0 <br />Freeboard at 25 Yr. H.W.L. Feet 1.3 1.0 <br />