A modeling effort was conducted for the two bio-retention basins constructed based on their as-built conditions. Using the as-built conditions, the estimated Total Phosphorous removed per year is 5.40 pounds for both basins. Modeling of the reduction for the basins, as constructed, showed a 49% reduction in Total Phosphorous.
Total Phosphorous (TP)
Total 15-yr Service Life TP Reduction (lbs)
Cost per Pounds of TP Removed
The initial SLAMM modeling effort estimated the cost for Total Phosphorous removed would be $1,000 per pound. The updated modeling in June 2014 showed a potential cost per pound of Total Phosphorous removed to be $1823.18. The actual cost per pound of Phosphorous removed, based on the as-built conditions, is estimated to be $1536.79 per pound.