The U.S. Army Corps of Engineers Jacksonville District will accept public comment on the supplemental proposed Finding of No Significant Impact (FONSI) for the design changes to the C-111 South Dade Conveyance Project, S-332B and S-332C pump station replacements. The pump stations will be constructed in Miami-Dade County, approximately 300 feet south of the current temporary pump stations. Comments are due October 30.
The proposed changes in pump station design include:
a. The construction of a long (approximately 3,216 linear feet) discharge channel in lieu of a short (approximately 2,029 linear feet) discharge channel and corresponding increase in footprint size
b. The change in pump composition to three 250 cubic feet per second (cfs) diesel pumps and two 75 cfs electric pumps
The project’s non-Federal sponsor is the South Florida Water Management District.
The 2020 Final General Reevaluation Report (GRR) and Environmental Assessment (EA) (the 2020 Final GRR/EA), which the FONSI is supplementing, evaluated various alternatives that would support the replacement of two temporary pump stations that were constructed under the 1996 project authorization and in response to the 1999 Jeopardy Biological Opinion on the Cape Sable Seaside Sparrow (CSSS).
The recommended plan identified in the 2020 Final GRR/EA was Alternative 3 - Short Concrete Channel; however, based on new seepage modeling conducted since completion of the 2020 Final GRR/EA, the proposed action is being revised, and Alternative 2 - Extended Concrete Channel, has now been chosen as the selected plan. The supplemental FONSI identifies that no additional environmental impacts will occur as a result of this shift that were not already identified in the 2020 Final GRR/EA.
The proposed FONSI is available for review at www.saj.usace.army.mil/C111SouthDade
Please submit public comments to Samuel.H.Hans@usace.army.mil by October 30, 2023.
The C-111 SD Project is located west of the C-111 Canal in southern Miami-Dade County in southeastern Florida and is an integral part of the overall Central and Southern Florida (C&SF) Project.
You can find additional information about the project, including the new documents available for review, on the Jacksonville District website at www.saj.usace.army.mil/C111SouthDade.