Central Everglades Planning Project (CEPP) Contract 11B, EAA A-2 Reservoir Embankment and Outlet Works

The work includes clearing, grubbing, demucking, blasting, excavation and processing of several million cubic yards of earthen material for the construction of a 17.3 miles-long embankment dam. Embankment height will be 38.0 ft above average natural grade in the north, east, and west: and 34.0 ft above natural grade in the south. Work will also include construction of four (4) multi-barrel, gated outlet-work structures, as well as one (1) multi-bay, gated inline-spillway. In addition, the work will include foundation preparation, installation of a seepage cutoff wall, canal backfilling, and all incidental related work to prepare approximately 8.0 miles of foundation for the 17.3 miles-long embankment dam. The approximate toe to toe width of the foundation is 260 feet in the north, east, and west; and 235 feet in the south. Last, the work will include construction of approximately 1.0 miles of parallel open channels (canals) as well as a maintenance road with benches between the canals. The northern most canal (seepage canal) will have a bottom width of 10 feet, 2.5H:1V side slopes, and an approximate depth of 16.5 feet below natural ground surface. The southernmost canal (Inflow/Outflow canal) will have a bottom width of 55 feet, 2.5H:1V side slopes, and an approximate depth of 16.5 feet below natural ground surface. The maintenance road and benches will separate the seepage and Inflow/Outflow Canals by approximately 65 feet and will have a minimum crest width of 14 feet approximately 4.5 feet above natural ground surface. Dewatering will be required to control the groundwater and conduct work in the dry in accordance with contract specifications. The work will be performed in a remote area of Palm Beach County, Florida approximately 13 miles south of South Bay and 30 miles northwest of Fort Lauderdale. Government furnished access is north of the SFWMD’s A-1 FEB off U.S. Hwy 27 and is shared with both SFWMD and USACE construction contractors. The work will require significant surface and groundwater management for the duration of construction to ensure proper foundation preparation occurs per project specifications. USACE will obtain the appropriate Comprehensive Everglades Restoration Plan Regulation Act (CERPRA) permit from the Florida Department of Environmental Protection (FDEP), however the construction contractor will be responsible for obtaining additional permits from the FDEP and the SFWMD for water use authorization and stormwater discharge during construction. Work will require the blasting, excavation, and processing of several million cubic yards of material to be used as embankment fill. Embankment dam internal drainage features will have very specific criteria and may require importing material from off-site. Full interior of embankment dam will be covered with soil cement. Muck pockets across the site can be expected to vary from several inches up to five (5) feet or greater with an average in the range of one to two (1 – 2) feet. The work will also require construction of a cutoff wall that will vary in total length (35 – 60 ft) and tip elevation (-25 to -50 ft below ground surface). Gated outlet work structures as well as the gated inline spillway structure will require construction of cofferdams and significant dewatering to maintain a dry working surface on the cofferdams interior for construction of these mass concrete structures. Further, additional construction contracts for other components of the EAA A-2 Reservoir are ongoing or may be issued during the performance period of this contract that require further coordination with the USACE, the SFWMD, and all applicable contractors. The contractor must be able to provide as-builts of the finished work acceptable to the Government.

Division 31 -	Earthwork, Erosion and Sedimentation Controls.
Division 33 -	Utilities, Storm Drainage Utilities, Ponds and Reservoirs.
Division 35 -	Waterway and Marine Construction, Shoreline Protection, Waterway Construction and Equipment.