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NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM <br />STORMWATER POLLUTION PREVENTION PLAN <br />ILL" 1460 <br />• • • •• <br />SEDIMENTATION POND REQUIREMENTS <br />Rainfall Intensity = 0.6" / hour (100 year frequency - <br />2 hour duration) = 1.2" total <br />Area of runoff = 35% <br />65 Ac. x 43,560 S.F./Acre x 1.211/12"/Ft. x 35% x 7.48 <br />Gal/Cu. Ft. = 741,260 Gallons required <br />741,260 gallons x 1.5 factor = 1,111,890 gallons. <br />Proposed sedimentation pond = 2,000,000 gallons <br />