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long l.\ke improvement project <br />Desi2H Characteristics <br />cm’ PARK WET DFTENTION BA5IN/’V^"ETLA>T) <br />Total excavation 10,000 cubic yards <br />Ncrmal water elevation (permanent pool) <br />Surface area at elevation at 945.5 and 944,5 <br />V'olume from elevation 935.5 to 945.5 <br />and 936 to 944.5 <br />Average depth <br />Maximum depth <br />Shelve slope <br />Side slope <br />Residence time <br />Phosphorus removal rate <br />Phosphorus removal efficiency <br />Basin 1 g4$in_^ <br />(overall yardage for boLh basins) <br />945.5 <br />0.5 acres acres <br />2.7 acre-feet <br />5.4 feet <br />10.0 feet <br />10:1 <br />1.3 acre feet <br />3.7 feet <br />S.5 feet <br />10:1 <br />3:1 3:1 <br />5.1 days (overall residence time for both basins) <br />39 Ibs/yr. (overall removal for both basins) <br />19% (overall removal for both basins) <br />T.rmg Lake Alum Treatment <br />.■Mum = Aluminum sulfate <br />Total lake area <br />Lake area treated <br />Minimum lake depth treated <br />Maximum dose to maintain <br />environmentally saie pH of 6.0 <br />Design dose <br />(A 12(504)3* 14H:0 <br />271 acres <br />220 acres <br />4 feet <br />280.000 gallons of alum <br />(aoorox. 610 pounds of aluminum/acre) <br />125.000 gallons of alum <br />(approx. 270 pounds of aluminum/acre)