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~}<~~~A~",!\~jh~.\j~b~\~~~t\~"::~~~' f' *>i'AB:'~W;P'-,,-i#iJ%'olt'k,~d:~ '"' CITY OF SUNNY ISLES BEACH 'i'~'" ,;;," . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - ba --'" Bermello Ajamil & Partners, Inc, Professional General Engineering Consultant for the North Bay Road Pedestrian and Emergency Vehicle Bridge, and the Town Center Park Observation Deck and Boardwalk Miami-Dade County This geometry would sustain vehicles at very low design speeds, but provide adequate clearance for emergency vehicles, Understanding that the City would prefer an at-grade crossing we would recommend that the vertical alignment maintain the minimum grades required for storm water drainage, The canal across which the proposed bridge will span is part of a Florida Outstanding Water Body, As a result, direct storm water runoff to the canal without water quality treatment will not be accepted by the Miami-Dade County Department of Environmental Resources Management, the Florida Department of Environmental and the United States Army Corp of Engineers, The design event that must be addressed is a 5 year storm, The storm water collected on the bridge will be diverted to the north and south embankment of the bridge where the following options may be considered: . Exfiltration trench system to meet water quality requirements and disposal via drainage well. . Storm water treatment unit such as Stormceptor or CDS to address water quality with a gravity outfall to the canal. Typically percolation rates are very poor in the City of Sunny Isles therefore requiring excessive exfiltration trench lengths, As a result, we would recommend option 2 above which will result in a more economical drainage solution, Bridge Structure In order to connect North Bay Road from 174th Street to 172nd Street, the construc- tion of a new bridge spanning over a finger canal is required, The canal is located between the Winston Towers on the north side and the Porto Bellagio and Avila South Condos on the south side, The Intracoastal Waterway is located on the west end of the canal. The bridge shall primarily be used to serve pedestrians, bicycles and emergency vehicles, The bridge shall also be wide enough to accommodate two (2) 13'-0" vehicular lanes, two (2) 7'-0" shoulders and traffic railings, The two vehicular lanes would allow traffic to continue on North Bay Road in the future, Due to right-of-way constraints and existing roadway alignment, the bridge geometry shall be complicated with a reverse curved alignment and heavy skew. In order to maintain the existing roadway grade at the bridge landfall and provide the required vertical clearance above the canal, the bridge superstructure depth needs to be minimized as much as possible. From past experience, a vertical clearance of 2'-0" above the design high water elevation and 6'-0" above the normal high water elevation is required as a minimum, The bridge length shall be shortened by extending the existing retaining wall along the north side of Porto Bellagio Condos located on the southwest corner of the canal. The canal width is www.bermelloajamil.com 4