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SJRWMD Stormwater Management Projects Cost -Sharing Application Form 2005-2006 B-6. Provide a detailed project description. Identify the type and amount of pollutant load reduction that will be achieved by the project (e.g., tons/year). What is the cost per unit of pollutant removed? Include approximate dimensions and capacities, if applicable. (Show how estimates are derived.) The Stormwater Park is intended to provide significant reduction of critical pollutants from the Lateral D canal, which contributes almost one-half of the total flow of the Main Canal network in East Indian River County. The Main Canal discharges surface runoff from agricultural and urban areas directly to the Indian River Lagoon (an Estuary of National Significance). The Aral Turf Scrubber and its attendant settling, polishing, and wetland ponds are proposed to reduce pollutant loads to the Main Canal by approximately 1.66 tons/yr total phosphorus (TP), 7.31 tons total nitrogen (TN), and 60.9 tons total suspended solids (TSS). With respect to Main Canal loads, these improvements represent a 12% reduction in TP, 9% reduction in TN, and 10% reduction in TSS. Sizing results for the 10 MGD, Egret Marsh ATS include dimensions of 347 ft width and 575 ft length to provide, as an annual average,TP removal of 80 m2/yr , and TN removal of 578 mYyr. In addition, the ATS is expected 1) to provide 15% reduction in color, a parameter important to the protection of submerged grass beds and 2) to increase dissolved oxygen, vital to the health of biota within receiving waters. Sizing and performance assessment of the ATS was conducted by the application of the ATS Design Model (ATSDEM) as developed and calibrated through contracted work with the SFWMD. The model is based on Monod growth kinetics in a format similar to that used for heterotrophic based waste treatment systems, such as activated sludge. A bench -scale study conducted at the Egret Marsh Site indicates that this model is appropriate for performance projections of an Egret Marsh ATS. TSS and particulate -P removal is expected to be provided by the Primary Settling Pond, which will have a detention time of 1-2 days. The Effluent Polishing Pond will permit modulation of pH levels of the ATS effluent (which is increased during photosynthesis)J., to about 7.4 upon discharge, similar to that of the targeted receiving water body (Lateral C Canal). Cost per unit pollutant removed is based on a 50 year present worth basis, and are expected to be within the ranges provided in analysis conducted for "ATS Present Worth Cost and By -Product Market Analysis- Mn 2005, SFWN D Contract 13933". The ranges for a 10 MGD faciility are pro- jected at $40470/1b -P, $7-$13/lb-N and $0.85-$1.60/lb-TSS removed. Final design is underway. EVALUATION FACTORS related to question B-6: Detail project methodologies. Identify the type and amount of pollutants that will be removed by the project (e.g., tons/year). Will the project be cost-effective? 0-20 points. Scoring is based on rater's assessment of the effectiveness of the project at achieving the stated pollutant load reductions. A-5