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NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM <br />( NPIIDRS )) <br />STORMWATER POLLUTION PREVENTION PLAN <br />FRENCH CAMP LANDFILL <br />CI'T'Y OF STOCKTON <br />Sedimentation Pond Requirements <br />Assumptions: <br />Rainfall Intensity = 1"/hour O .Ev1114• <br />Durations 2 hours.or 2" <br />Area of runoff = 65 Acres or 2,831,400 S.F. <br />Coefficient of runoff = 25 <br />2,831,400 S.F. x 2" / 12" psf x 25% x 7.48 gal/cu. ft = <br />882,453 gallons required. <br />882,453 gallons x 1.5 factor = 1,323,6719 gallons <br />Proposed sedimentation pond size = 2.5 million gallons <br />Prepared by: <br />John Fukumoto <br />R.C.E. 26987 <br />