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I NUBBIN SLOUGH WETLAND RESTORATION HIGHLIGHTS: I • Wetland restoration and mitigation ■ Water quality management,planning, • Remediation and removal of and implementation 50,000 CY of material • Nuisance and exotic species removal ■ Construction oversight The Nubbin Slough Wetland Restoration and Dairy IFarm Remediation project is located east of Lake Okee- chobee in South Florida. The Nubbin Slough site con- 1;': . tains a large stormwater treatment area; 435 acres of his- torical wetlands and pastureland; and the former New- , corners Dairy Farm. ," 'tAi t ?� i 0 � 'yi;rr • i A` I 'LI P`)] if. , it tr t. '•H-�T'?ns ECT was authorized by the South Florida \Vater Man- s . r I. agement District to complete the Nubbin Slough restora- �'.'' ;,` t'x.w- .' -'-:, R;iris , 1s tion. The primary objective of the project was to restore .;:-,r,;; ,,4 ,,,,, `o�, u� rr .r t top,r wetlands within the project area and restore the former w; I fi 4T'�1� 4 ,`�l Yl� n..r. dairy farm area to mimic pre-development natural condi- W.;." �' '=:rte-�-1 ;r-4. .: r', tions. A secondary objective was to maximize water Istorage and phosphorus uptake by plants within the re- ; ,; J ;-,7 ' stored wetlands. ,-9(.1,5..G.,,;;: . - 1 The design resulted in restoration of nine wetland sys- tems. as well as remediation of the dairy farm site by removing structures and regrading. Increased storage -e • — Ivolume resulted in longer stormwater detention times f'i' `e" and capture of 310 kilograms (kg) of phosphorus per :.r; 1 • '" year. The design of the former dairy farm area created a - e site that mimicked pre-development natural conditions. In addition, existing "onsite" phosphorus would be re- . --- tained within the former dairy farm site by creating an • I earthen cap over the top of former treatment ponds. Stormwater best management practices were im- plemented to capture approximately 79 kg of phosphorus per year. ECT carried out the following: • Baseline survey. I • Construction of a series of ditch plugs within grassy swales to increase the retention ca- pacity of the individual wetlands. • Remediation of the dairy farm structures and foundations and removal of nearly I 50,000 cubic yards (CY) of fill material. • Fill and grading of treatment ponds, cooling ponds and ditches with engineered fill ac- cording to Natural Resource Conservation Service Conservation Practice Standards. I • Maintenance of buffer zone to settle out phosphorus, reducing load to surface waters. • Construction of ditch plugs to create retention/detention within the dairy farm area. • Re-vegetation of regraded areas and ditch plugs with beneficial grasses. s LV/ PROJECT PROFILEt. `., �:..>� Y 1FTPDISCBII.\EIWATERWROFO.FSFLISFWAID-NUBBLY DOCX-030311