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Draft Indian River County Lagoon Management Plan Outline April 2019 Nutrient reductions observed at the Osprey Marsh system are approximately 12,000 pounds per year of TN and 2,400 pounds per year of TP. 3.2 STORMWATER The Stormwater Division has developed projects designed to Reduce the pollutant load into the IRL. Specifically, nutrients such as nitrogen and phosphorus are targeted for reduction to meet the TMDL. These •rojects also Reduce total solids that can carry nutrients and other contaminants. 3.2.1 Egret Marsh Stormwater Park and Wildlife Sanctuary Egret Marsh uses algae to remove nutrients from approximately 10 mgd of canal sto water. The algae are harvested and not released to the lagoon. After treatment by the algae, the filtered sto ater flows through a large polishing pond and shallow marsh and returns to the canals and flows through the ain Relief Canal, eventually emptying into the lagoon. Egret Marsh removes an average of 13,200 pounds pery-ar of TN and 3,000 pounds per year of TP. 3.2.2 Osprey Acres Flowway and Nature Preserve The flowway continues to filter water from Osprey Marsh along with unfi ered water from the South Relief Canal. Filtering occurs through a system of treatment cells using aquatic plants o remove nutrients and then to a serpentine flowway for final polishing, eventually released further down the ca9 I and to the lagoon. The estimated pollution removal from Osprey Acres is 3,000 pounds per year of TN and 300 pounds per year of TP. 3.2.3 PC Main Screening System The PC Main screening system removes freshwater plants .nd trash from the Main Relief Canal before the canal empties into the lagoon. Ten screens are used to remove -lI floating and submerged pollutants to the diameter of a paperclip wire (1/16 inch) and is run on approximatel 15 horsepower. Pollution removed on average includes 1,800 pounds pe year of TN, 500 pounds per year of and 874,000 pounds of trash, plants, and other debris. 3.2.4 System Maintenance The Road & Bridge Division provides mainte . nce throughout the county in support of a healthy IRL. This maintenance includes a street sweeping program that sweeps a total of 422 miles per cycle, usually 6 cycles per year.9 The division also conducts a ditch cle.•nin program,which includes 860,138 linear feet of ditches that are cleaned and maintained about 4 times ,per year. Data on these maintenance activities are included in the Stormwater Division annual report. 3.3 CONSERVATION LAN The primary purpose and object! of the County Parks' Conservation Lands Program is to protect, Revitalize, and sustain endangered ecosyste and associated rare and endangered species in Indian River County. Secondary objectives include passive blic recreation, preservation of open space, groundwater quality protection, flood protection, protection of hi orical and cultural resources, and general preservation of "quality of life." 3.3.1 Jones' Pier C nservation Area The Jones' Pier Conservation Area is part of the rich history of late 19th century/early 20th century settlement in Indian River County. In 1889, Seaborn Jones and his family homesteaded 160 acres on Orchid Island. Mr. Jones and his neighbors built the "Orchid -Narrows Road" which is now known as Jungle Trail (listed in 2003 on the National Register of Historic Places). The 16 -acre conservation area that was purchased by the County in 2011 is part of this original homestead. The County acquired the site from the Jones' family with assistance from the Florida Communities Trust. As part of the purchase, the County committed to implementing a management plan for the site TETRA TECH 11