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Study Conclusions <br />By 2020. residential land use will.increase <br />to 80% of upland area - 983acres (56% of <br />sub-watershed): 314 acres appropriate for <br />Infiltration <br />Average annual TP in Stubbs Bay will ' <br />increase from 57 to 62 ug/L under 2020 <br />conditions <br />In-lake Improvement Options <br />Hypolimnetic aeration <br />Artificial de-stratIfication (i e mixing) <br />Copper Sulfate <br />Chemical treatment of anoxic sediments <br />AJum p<us lime <br />4;:?'Fernc chlonde. with A without aeration ,, <br />Calcium carbonate (spent lime) <br />Calcium nitrate (i.e. RlPLbX) <br />■X <br />Aluminum Sulfate (alum) <br />Reduces alkalinity and pH (must be >6.0) ’’■) <br />Would require 2 doses over a.25 year .0 <br />period <br />Sedimentation reduces effectiverwss (2 ( <br />cm) ^ <br />Estimated capital cost • $341,000 (1 dose) <br />Annualized cost estimate • $36,000 (2 . ^ <br />Annualized cost/decrease in TP ($/li0/L) -jm <br />$2,800 .