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tui Contract NSD509AA EXHIBIT "B" - SCOPE OF WORK WABASSO CAUSEWAY PARK IMPROVEMENTS PROJECT 1. INTRODUCTION: The Wabasso Causeway (CR510) crosses the Indian River Lagoon (IRL) in north Indian River County. The Wabasso Causeway Paris encompasses 2 spoil islands, which were constnicted to support the bridges that make-up the causeway. These islands have eroding shorelines causing siltation in the IRL and causing negative impaets to adjacent seagrass and oyster beds. Constructed in 1970, one of the last causeways placed in the lagoon, the Wabasso Causeway serves as an important public amenity, providing recreational facilities, such as a boat launching ramp, fishing pier, restrooms, picnic pavilions, and other amenities associated with public recreation and waterfront navigation. In 1999, COUNTY initiated a project to improve the causeway through landscaping, improving and stabilizing the boat ramp, redefining the parking area, building permanent restroom facilities, adding a shower, and stabilizing the shoreline with coquina revetment and establishment of stormwater detention swales to reduce runoff. Under Phase I of the project, COUNTY, with a grant from the Florida Inland Navigation District (FIND), have produced a detailed design and received permits for the causeway improvements. Utilizing another grant, from the Florida Department of Transportation (FDOT), COUNTY has installed landscaping enhancements in front of the park areas, along the roadway. Under Phase 11, COUNTY will continue upgrading the amenities on the causeway, installing water and sewer liners, sidewalks, new bathroom building, a shower, additional landscaping, and coquina rock revetments alang the shoreline with storrnwater detention areas landward of the stabilized shoreline. COUNTY has received funding assistance for Phase 1I from FDOT's Highway Beautification Grant Program ($150,000) and FIND's Waterways Assistance Program ($120,000), and is seeking funding assistance from DISTRICT's IRL Program ($100,000). COUNTY is contributing $157,000 towards Phase 11 construction costs. The "St. Johns River Water Management District" name shall be added to the four (4) project signs and two (2) temporary construction signs (with DISTRICT's logo) as a contributing agency. II. WORK DESCRIP'T'ION. DISTRICT's IRL Program has budgeted funding for this project through the Water Management District Trust Fund to be applied towards the shoreline stabilization, revetment work on the east and west islands. COUNTY will install 953 Linear feet of coquina rip -rap revetment along the northern side of the Fast Island with backfill of clean, select sandy fill to capture, detain, percolate and ftIter run-off in three stormwater areas landward of the revetment providing 4,315 cubic feet of dry detention. The west island will include I,139 linear feet of revetment (approximately 869 ft. on the northern, and 270 ft. on the southeastern shores) with sandy backfill for five proposed stormwater detention areas providing 2,433 c.f. of treatment area. 'The vegetative swale detention arcus will create a "greenbelt" along the shoreline, behind the revetment, wherein there is no pedestrian or vehicle access. Limiting access along the Shoreline will further reduce erosion from human activities. Page l of 3