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Mark Justice <br />December 19, 2019 <br />Page 2 <br />The second part of the analysis was to introduce reclaimed water high in Nitrogen and Phosphorus to <br />the wet retention ponds and determine the potential increase in the nutrients being discharged to the <br />Indian River Lagoon. The analysis assumed that the permitted yearly allocation for groundwater <br />withdraw will be replaced by reclaimed water, therefore 58.4 MGY was used as the volume of <br />reclaimed water to be added to the system. The concentrations of Nitrogen and Phosphorus were taken <br />from a monthly monitoring report prepared by FDEP. The complete calculation is included with this <br />report and the results are summarized below. <br />Windsor 412 -acre <br />Development <br />Existing <br />After Removal in <br />Wet Detention <br />Ponds* <br />Adding <br />Reclaimed <br />Water <br />% Increase <br />kg/yr <br />kg/yr <br />kg/yr <br />Total Nitrogen (TN) <br />1250 <br />750 <br />1039 <br />38.5% <br />Total Phosphorus <br />(TP) <br />197 <br />79 <br />203 <br />256.9% <br />*The existing wet detention ponds remove 40% of the total Nitrogen and 60% of the total Phosphorus. <br />The results show that adding reclaimed water to the existing wet ponds will increase the TMDL for <br />nitrogen and phosphorus being discharged to the Indian River Lagoon during storm events. Increasing <br />the Phosphorus and Nitrogen discharges to the Indian River Lagoon can cause algal blooms and <br />negatively impact the growth of seagrass in the lagoon basin and directly conflicts with the goals of <br />the Central Indian River Lagoon Basin Management Action Plan as adopted in February of 2013 by <br />the Florida Department of Environmental Protection. <br />ECONOMIC FEASIBILITY <br />The existing force main used to distribute reclaimed water will need to be extended approximately <br />3,000 linear feet north on State Road Al A to bring the reclaimed water into the appropriate stormwater <br />pond on the Windsor property. In addition, the stormwater pond receiving the reclaimed water will <br />need to be dewatered, isolated, and lined to prevent groundwater contamination. The costs associated <br />with these modifications are significant and do not make the project economically feasible. <br />74 <br />