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Section 5 Formulation of Alternative Plans

EAA Storage Reservoirs Revised Draft PIR and EIS February 2006

5-26

5.3.11.3 Littoral Shelves

Littoral shelves are shallow-water areas around the shorelines of the seepage

canals where sunlight usually penetrates to the bottom. Aquatic vegetation,

such as emergent and submergent plants, can grow in these areas. Not only

would littoral shelves and their associated vegetation provide excellent aquatic

habitat for fish and other aquatic organisms, they would also provide water

quality improvements due to the removal of nutrients by the vegetation, and

increase recreational opportunities, such as fishing. The littoral shelves would

be constructed by scraping down the peat layer.

5.3.11.4 Stormwater Treatment Area (STA)

Operation of the EAA Storage Reservoir project involves capturing and storing

regulatory releases from Lake Okeechobee and runoff from the Everglades

Agricultural Area and subsequently delivering the stored water for to the

Everglades Agricultural Area and to meet hydrologic targets in the Water

Conservation Areas (WCAs) and Everglades National Park (ENP). Although the

alternative plans work 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

as an additional on-site management measure. 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 STA. The

optimization of the proposed STA may include utilizing a portion of Cell 2 of the

reservoir for water quality treatment.

5.3.12 Costs of Alternative Plans and Components

Construction cost estimates for the various alternatives were made in the Micro-

Computer Aided Cost Estimating System software (MCACES) version 5.31. The

basis of the cost estimates was the scope of work provided by the engineering

technical lead. The scope of work provided a layout of the plan features, a

description of the major feature’s special considerations, quantity calculations,

and specific reference to particular structures. Cost estimates for culvert

spillways, culvert structures, and pump plants were produced in cost models

from quantities provided. The final alternate costs were produced in spreadsheet

format by extending the unit cost produced in MCACES by quantities provided

in Table 5-9. Additional costs for water quality monitoring, recreation features,

and operations and maintenance of recreation features have been developed and

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