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. . . . . . . . . . . . . . I. . . . . . . . . . . . . . . . . . . . . . . . . . . . . ,,,, ,"-w..--"'" Engineering Services for Government Infrastructure RFQ No. 07:-03-01 .... ~, ~. 3. Horizontal and vertical alignments will be refined to emphasize comfortable span arrangement, constant structure depth, substructure-pier outside of the canal, bottom of the superstructure above the splash zone (12 feet above Mean High Water) due to the proximity of the Intracoastal Waterway and the environment classification probably being extremely aggressive. Navigation and maintenance barges operating under the structure will also be considered. Refinements/adjustments to the alignment or span arrangements will also consider cost effectiveness. 4. Providing substructure elements that can be constructed with minimal impact to the existing properties (i.e. use of drilled shafts for pier footing and spread footings for the temporary south pedestrian/bike/emergency vehicle approach ramp in order to minimize vibration and settlement/cracks of the existing surrounding buildings and parking). 5. Designs and plans will be reviewed by our experienced construction engineers and former contractor for constructability, phasing, and cost effectiveness, as well as: D Method of Erection due to the proximity of the existing properties. D Crane location D Transportation of girders D Access to the site during construction D Constructability of future vehicular access on the south approach of the bridge. D Staging requirements This is a pedestrian/bike/emergency vehicular bridge that must blend with the existing environment and hence aesthetics is a primary consideration. The tight superstructure curved horizontal alignment requires steel/concrete curved superstructure members; these members will follow the curves of the outside pedestrian face barrier creating a harmonious visual impact. Single or multi-columns will receive architectural treatments such as rustications. Proprietary retaining walls (MSE) walls will be used on the north approach of the bridge. The temporary south pedestrian/bike/emergency vehicular approach ramp connecting to the bridge with special PVC railing and with ADA provisions will also be constructed utilizing special concrete patterns and finishes to enhance the overall aesthetics of the project (See Inset). If box superstructure type is used, utilities, conduits, etc. can be installed inside the boxes, except water and sewer main due to possible pipe rupture. By concealing the utilities they do not negatively impact the aesthetics; also the bridge lighting conduits will be installed inside the box or pedestrian railing barrier. During the initial phase of the pedestrian usage, a possible practical aesthetic enhancement could be a canopy similar to the Williams Island vehicular/pedestrian bridge designed by BHA (See insets). The Marlin Team will design unique elements such as canopy/covered walkway and attractive custom railing with integrated lighting that will be aesthetically pleasing. ~. ~" ~I'l , ...\1 \ \ ~ t\ ! II 'V I :=' ., { ':"- .:.: Design parameters will include: D Structural Form and Geometry: Efficient and Elegant D Transparency and Slenderness: Single Column or Hammerhead Pier with architectural treatments D Integration with surrounding environment D Economical Solutions ~.~~~,