NOTICE OF INTENT TO SOLE SOURCE MODIFICATION: REDUCED PERIOD OF PERFORMANCE FOR CENTRAL EVERGLADES PLANNING PROJECT (CEPP) CONTRACT 11B, EVERGLADES AGRICULTURAL AREA (EAA) A-2 RESERVOIR EMBANKMENT AND STRUCTURES, PALM BEACH COUNTY, FL.

Intent to Sole Source – Modification: Reduced Period of Performance for Contract W912EP24C0018

The U.S. Army Corps of Engineers, Jacksonville District intends to modify Contract W912EP24C0018 on a sole source basis to Thalle Construction Co. Inc., 900 NC Highway 86N Hillsborough, North Carolina 27278-8226, under the authority of 10 U.S.C. 3204(a)(1) as implemented by FAR 6.302-1(a)(2)(iii), Only One Responsible Source and no other services will satisfy agency requirements. The purpose of this modification is to reduce the period of performance, by changing the completion date for the majority of the work from 2034 to 2029 for the Reservoir construction and other identified project work.

No reimbursement will be made for any costs associated with providing information in response to this notice. This is not a solicitation for competitive proposals; however, if any interested party believes that they can meet the above requirement, they may submit a capability statement and any relevant documentation to the point of contact(s) listed in this notice. All information furnished must be in writing and must contain sufficient detail to allow SAJ to be able to determine if the interested party can provide the requirement described herein. The submission must be received no later than 24 October 2025.

Contract Project Description:

The work includes clearing, grubbing, de-mucking/removal of overburden, blasting, excavation, and processing of several million cubic yards of earthen material for the construction of 17.75 miles long "D-623" embankment dam. Embankment height will be 38.0 ft above average natural grade in the north, east, and west: and 34.0 ft above average natural grade in the south. Work also includes construction of four multi-barrel, gated outlet-work structures (S-624, S-625, S-626, and S-628), one un-gated overflow spillway section (S-627), as well as one multi-bay, gated inline-spillway (S-629). In addition, the work include rock foundation preparation, installation of a seepage cutoff wall, canal filling, and all incidental related work to prepare approximately 2 miles of foundation for the 17.75 miles-long D-623 embankment dam. Rock foundation preparation and cutoff wall installation for the remaining 15.75 miles will be completed by others.

The work also includes construction of approximately one mile of parallel open channels (canals) as well as a maintenance road with benches between the canals. The northern most canal (C-636 seepage canal) will have a bottom width of 10 feet, 2.5H:1V side slopes, and a depth of 16.5 feet below average natural ground surface. The southernmost canal (C-623 Inflow/Outflow canal) will have a bottom width of 55 feet, 2.5H:1V side slopes, and a depth of 16.5 feet below average natural ground surface. The maintenance road and benches will separate C-623 and C-636 by approximately 65 feet and will have a minimum crest width of 14 feet 4.5 feet above average natural ground surface.

Surface and subsurface water management will be required to control surface and groundwater levels and conduct work in the dry at various locations within the construction limits in accordance with applicable Contract specifications.