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RS&H is providing design services to widen I-95 from SR 44 to I-4 by adding fifth and sixth lanes within the existing median. The existing pavement will be milled and resurfaced, and the interchange at SR 421 will be reconstructed. The length of the project totals 10.4 miles.
In order to treat the additional impervious area, the team provided wetland stormwater management systems in the median wetlands. These systems and outfall structures were designed to retain the biological and hydrologic features of the existing wetlands, thus reducing the actual impact to the wetlands.
The team also designed dry retention ponds in the interchange infield areas and the existing abandoned rest areas along I-95. The recovery analysis for the dry retention ponds was completed with the use of PONDS version 3.2. The dry retention ponds and median wetland areas virtually eliminated the need for expensive off-site ponds, proving to be the least expensive alternative with fewer impacts to the wetlands and surrounding environment.
All stormwater management facilities ultimately discharge to Spruce Creek or the Tomoka River, both of which are classified as Outstanding Florida Waters by the Department of Environmental Protection. The additional treatment volume requirements for these basins were included when modeling the stormwater management facilities with ICPR.
The existing cross drains and box culverts throughout the project were extended to accommodate the additional travel lanes and to be compliant with clear zone criteria. The existing and proposed drainage patterns within the project area do not separate on-site runoff from off-site runoff. Therefore, the cross-drains and culverts were integrated into the ICPR model used to design the stormwater management facilities.
An Individual Environmental Resource Permit was obtained from St. Johns River Water Management District and an Individual Section 404 Wetlands Permit was obtained from the U.S. Army Corps of Engineers.
Volusia County, Florida
Florida Department of Transportation, District Five