EAC Consulting, Inc. - Laserfiche WebLink

Home Browse Search

D-33 RFQ 20-10-01 Professional Engineering and Architectural Services for Pedestrian Bridge with Park Elements Across A1A at 174th St. CCNA D PEDESTRIAN BRIDGE RAILINGS One of the major objectives for this project is to avoid the use of a fence or cage over Collins Avenue - which is common in many pedestrian bridges in Florida. We propose to use landscaping and a buffered area so that pedestrians are not walking adjacent to the roadways below. This will allow for a more natural and open bridge design. The proposed conceptual glass railings are aesthetically pleasing and provide clear visibility from both above and below the bridge. A maintenance concern due to the salt derived from the proximity to the beach, however, may need to be evaluated. During the preliminary design phase, we will evaluate this alternative along with other options and strategies that would not require the cleaning and maintenance associated with glass. ELEVATORS The proposed elevators will be designed and positioned in strategic locations that will not impact pedestrian circulation near and under the new pedestrian bridge. We will recommend the use of highly resistant materials to minimize maintenance in the future. We have recently designed several pedestrian bridges with elevators, and are acquainted with all the features required to extend longevity and reduce life cycle costs. AESTHETIC BRIDGE LIGHTING The aesthetic lighting will enhance the appearance of the pedestrian bridge at night, and will provide a safer and more comfortable crossing. We will propose the use of low maintenance Light Emitting Diode (LED) lighting that is well integrated with the architecture of the bridge. The use of lighting fixtures that change colors for special events could be added to the project at minimal cost. We will provide indirect lighting and conceal the location of conduits and electrical connections. We will also provide cut-off luminaries to not impact the adjacent residential buildings surrounding the crossing, and follow Florida Fish and Wildlife Conservation Commission (FWC) guidelines for the use of turtle-friendly fixtures. ENVIRONMENTAL APPROACH The environmental approach for the project will center on identification of protected resources and potential contamination issues for consideration in the construction of the pedestrian overpass located at the Collins Avenue (A1A) and 174th Street intersection. This concept design recommends an open and elevated bridge park over the south side of the intersection, traversing east and west, to accommodate for vehicular improvements at the surface level and to bring pedestrians to an elevated plane for an enhanced crossing experience reflected as an extension of the Samson Oceanfront Park. Smart-Sciences will identify protected resources and potential contamination issues and will work with the design team to minimize and avoid impacts to the greatest extent practicable. Smart-Sciences conducted preliminary research for the study area. Based on GIS and ETDM reviews, Smart-Sciences has identified the following environmental considerations and their potential effects: Contamination: Few potential hazardous materials sites were identified within the vicinity of the proposed pedestrian bridge - including FDEP storage tank contamination monitoring sites and petroleum contamination monitoring sites. Potential Effects: A Contamination Screening Evaluation Report will be prepared. This will be important for dewatering, areas of earthwork, and placement of exfiltration trench. Wetlands/Surface Waters: No wetlands or surface waters are present at the landing areas of the proposed pedestrian bridge or along the corridor. No wetland permitting with the County, State or USACE is required. Potential Effects: None Wildlife and Habitat: The proposed pedestrian bridge lies within the US Fish and Wildlife Service consultation areas of the American Crocodile, Florida bonneted bat, piping plover, and the manatee. Several trees are located in the landing areas of the proposed pedestrian bridge. Potential Effects: A Listed Species Technical Memorandum will be prepared. If endangered or threatened species involvement is identified, a biological assessment for formal consultation will be prepared. There are numerous street trees and structures within the proposed project location that could be suitable for roosting by the Florida bonneted bat. A roosting or acoustical survey may be required. There is no in-water work proposed, therefore, there are no anticipated impacts to manatees and American crocodiles. There is also no work proposed in habitat for the piping plover, therefore no anticipated impacts are expected. Trees: If trees are proposed for removal or relocation a tree removal permit will be required from Miami-Dade County. Bonneted Bat Sea Turtles