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Over the past four months representatives from Indian River County and Boyle Engineering Corporation have been participating in the Environmental Coordination Phase of the Indian River Boulevard North Extension project. A series of 15 meetings have been held with regulatory agency representatives to discuss the project alignment, roadway design, drainage, stormwater/surfacewater management, environmental impacts and mitigation of those impacts. As a result of the meetings, a "conceptual design" has been prepared that will be refined during the Preliminary Design Phase of the project. The design includes the following: Alignment - The alignment prepared during the two lane design (1979-1981) should be maintained (Exhibit 1). Design - The roadway should be a limited access, four lane, rural cross section on fill, with a 25' grassed median and roadside swales. Two twin bridges (one at the Main Canal and one at the North Canal) should be constructed. The average right- of-way width for the typical section would be 2251. Drainage - A drainage study of the upland/wetland basin in the vicinity of the project should be prepared, so that drainage structures to convey off-site runoff can be designed. Of critical importance is the conveyance and discharge of flows that pass to the project site from the Country Club Pointe area, and whether the flows can be discharged to the adjacent impoundment or must be passed on to the Main and North Canals. Stormwater/Surfacewater Management - Stormwater treatment and surface water management should be handled within the swale systems on each side of the roadway. Berms will isolate the system from offsite flows. Discharge will either be to the adjacent impoundment if it is acquired or to the Main and North Canals. The County should pursue the determination of whether there is legal precedent for acquiring impoundment wetlands by eminent domain, if the impoundment will be part of the stormwater/surfacewater management system for the roadway. Mitigation - Mitigation of the 20 acres (approximately) of wetlands impacted by this project will be required by all of the permit and review agencies. The total acreage of mitigation and the specific site have not been established. However the agencies are willing to negotiate this issue prior to receipt of permit applications, and off- site mitigation can be considered. It should be noted that all agency representatives stressed that the optimal site would be the impoundment adjacent to the project. Coordination - The general agency reaction to the project was positive, but they would not "approve" of the project in writing at this time. Continued coordination with agency representatives is essential in order to resolve the mitigation issues. The location of the mitigation site will also impact both the drainage and stormwater/surfacewater management design for the roadway. Coordination with Country Club Pointe, Pelican Island Audubon Society and other interested parties should continue. Recommendation - Upon review and approval of this report by the County it is recommended that the County forward written authorization from the Director of the Public Works Division for Boyle Engineering Corporation to proceed with the Preliminary Design Phase based upon the conceptual design as modified herein. In addition, the County and Boyle Engineering Corporation should review the Scope of Services presented in the Agreement so that the tasks described above related to mitigation, drainage, and coordination can be pursued in parallel with the Preliminary Design Phase. 62 BOOK : J' r,H