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Section 6 The Selected Alternative Plan

EAA Storage Reservoirs Revised Draft PIR and EIS February 2006

6-11

Cut-off walls will be installed as part of the levee or embankment construction.

For earthen embankments, the estimated depth of the cut-off wall is 35 feet

along the east, north, west, and STA3/4 sides of the reservoir. A 50-foot deep

cut-off wall will be installed along the Holey Land area.

6.1.8 Bridges

The S-609 box culvert structure will be constructed underneath U.S. Highway

27. This structure will serve as a hydraulic connection between the EAA

reservoir and the North New River Canal. More detail on structure S-609 is

provided in Section A-2.4.2.2.1.2 and Plate C-5 in the Engineering Appendix

(Appendix A).

Bridge relocations/replacements will be required due to channel improvements

in the Miami, North New River, Bolles and Cross Canals. Improvements to the

Miami Canal will necessitate the replacement of 2 bridges. Improvements to the

North New River Canal will necessitate the replacement of 7 bridges.

Improvements to the Bolles Canal will necessitate the replacement of 3 bridges.

Improvements to the Cross Canal will necessitate the replacement of 5 bridges.

6.1.9 Stormwater Treatment Area

Operation of the EAA Storage Reservoir selected plan involves capturing and

storing regulatory releases from Lake Okeechobee and runoff from the

Everglades Agricultural Area and subsequently delivering the stored water for

both water supplies to the Everglades Agricultural Area and to meet hydrologic

targets in the WCAs and Everglades National Park. Although the selected plan

works in concert with STA 3/4, it is anticipated that the additional hydraulic and

phosphorus loading associated with delivering additional water to the WCAs and

Everglades National Park to meet hydrologic targets will occasionally exceed the

treatment capacity of STA 3/4. To ensure that water that is to be delivered to

the WCAs and Everglades National Park meets water quality requirements, a

conceptual STA is included in the EAA Storage Reservoir selected plan.

Approximately 1,495 acres of land already owned by the State of Florida and the

South Florida Water Management District adjacent to and in the southwest

corner of the reservoir have been identified as the likely site for the STA.

Additional analysis will be conducted prior to the Final PIR and during the

detailed engineering and design phase of the project to refine the design, cost,

and operations of this storm water treatment area. Sizing and optimization of

the proposed STA may include converting a portion of Cell 2 to a STA as well.

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Wenger 72944 Spezifikationen Seite 239