Comprehensive Everglades Restoration Plan (CERP), Indian River Lagoon South, C-23/24 Stormwater Treatment Area

Description of the Project The work includes construction of an approximately 1,300-ft long, 84-in diameter sag culvert passing under the C-24 canal connecting on one end to a future planned reservoir and on the other end to a stormwater treatment area (STA). The sag culvert will be constructed out of HDPE pipe. The section below the planned reservoir embankment will be encased with cast-in-place concrete to meet dam safety requirements per EM 1110-2-2902. The barrel invert elevations are as follows: Reservoir Side (West of C-24 Canal) 15.00-ft-NAVD88, Under C-24 Canal -2.50-ft-NAVD88, and STA Side (East of C-24 Canal) 15.00-ft-NAVD88. The work also includes excavation for foundation, foundation preparation and construction, backfill to pre-existing ground, placement of stone protection, placement of headwalls, gates, buildings, and installation of all power and control equipment for the sag culvert. Specific Project Challenges: The method and sequence of construction for the sag culvert under the existing C-24 canal (barrel invert elevation at -2.50-ft-NAVD88). The C-24 canal must remain operable throughout construction. Existing Florida Power & Light (FPL) service towers are approximately 100-ft from the sag culvert centerline on the STA side (east of the C-24 canal). Experienced personnel will be required to avoid this existing infrastructure. In addition, vehicle traffic access must be maintained for FPL to access the project site and existing infrastructure during construction. The contractor shall provide means and methods/plan for the ongoing maintenance of the 1,300 foot long sag culvert during emergency and non-emergency conditions after construction. Maintenance includes how inspections will be performed (e.g., dewatering, entry/walkthrough methods, remote methods, etc.), how sediment and debris will be removed (e.g., pipeline pigging), and how repairs and future major rehabilitation will be performed, etc. The contractor must be able to provide as-builts of the finished work acceptable to the Government.

Division 02 -	Existing Conditions, Environmental Assessment, Natural Environment Assessment, Water Remediation.
Division 32 -	Exterior Improvements, Wetlands.