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I I These elements are pre-cast, prc-tensioned closed sections, and provide torsional resistance as well as a smooth aesthetic appearance. They are also cconomical and lead to accelerated construction procedures, and can be cast as relatively shallow sections. As with the post-tensioned box option, this bridge would make use of reinforced concrete abutments founded on drilled shatls, and the pier would bc a cap on drilled shafts. I As with the previous alternatives, architcctural enhancements can easily be incorporated to provide a more pleasing structure. The pier can be extended to support alcoves, giving the public an unobstructed view of the sights around the structure, and the cap can be cast to any shape desired. This simple, yet functional and attractive structure would not preclude any contractors lacking complex experience from bidding the job, and would rcsult in more competitive construction costs. I I I Boardwalk - The Town Center Park observation deck and boardwalk constitute the second focus of this project. Many of the same techniques, architectural trcatments, materials, and themes used in the bridgc will be carricd over to the boardwalk to provide continuity between the structures and a universal feel throughout the site. Again, it is anticipated that drilled shatls would be used to limit construction noise forced upon the public and limit disturbance to the adjacent environments. The substructure could be concrete, timber, or synthetic material depending upon the demands and look that is desired. I I There are many options for the superstructure of the boardwalk. Again, several materials will be considered, as will how each will match the stmcturc type of the adjacent bridge. Repeating pre-cast arch barrels could be used to blend with the two arch options. A concrete slab structure could be implemented to match the form of eithcr the FUB or post-tcnsioned box alternatives, or a timber superstructure could be implemented to give a more rustic feel and blend with the over hanging Mangrove trees. A concrete surt~\ce will better facilitate strollers, bicycles, and roller blades due to the elimination of joints present betwecn timber planks, whereas a tiberglass (or other material) grating material will allow light through for the sea grass present in the waterway I. Each brings its own benefits to the tablc, and all will be weighed to arrive at the best choice. I I I One focus in the design of the boardwalk will be to rcduce the number of substructure units. This will not only reduce the impacts on the channel, construction time, and matcrial costs, but will result in a less cluttered, open appearance. The goal is to provide the lease intrusive structure possible. To further add to the uniqueness of the boardwalk, the vertical profile can be varied to give pedcstrians a more sensual experience. A sinusoidal profile will not only give variety to thc users of the boardwalk, but will add to the visual appeal of the structure by providing a smooth, flowing form. Thc boardwalk will have an observation deck at the east end adjacent to a recently constructcd park. A gazebo and seating area would fit in well at this location, giving a chance to take in all the sites presented at this location. Planters could also be incorporated to give a softer feel, and a sitting area crcated for travelers to relax during their stroll. I I I Bulkhead wal/- There are existing bulkhead walls on both sides of the waterway that will be impacted by the project. It is anticipated that any modification or replacement of these walls will need to be closely coordinated with the architectural treatments and themes used on the pedestrian bridge and boardwalk. Cast in place reinforced concrete walls supported on piles would be the most likely candidate for these structures, providing a cost effective solution that also possesses flexibility to incorporate a widc range of architectural features. Depending on the final alignment and location of bridge substructure units, appropriate stcps will be taken determine the limits of reconstruction, or if total replacemcnt of these walls is warranted. I I Environmental Permitting Existing environmental conditions at the project site include the presence of: I Coastal mangrovc wetland system. The canal's south shore is dominated by a mangrove shoreline (Harvey Baker Graves Mangrove Preserve) exhibiting: · Approximately 950 fect by 80 feet (1.5 Acres) mangrove forest primarily consisting of red mangrove but includes white and black mangroves. I I