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Section 5 Formulation of Alternative Plans

EAA Storage Reservoirs Revised Draft PIR and EIS February 2006

5-24

5.3.11 Additional On-Site Management Measures

The following environmental management measures have been developed to

provide an increase in spatial extent of natural areas adjacent to or within the

EAA storage reservoirs or to ensure that the project will not adversely affect

downstream natural areas. Since the final alternative will be selected based

upon system-wide benefits, these measures were developed (description, cost,

benefits, etc.) to fit any configuration of storage formulated. These

environmental management measures are separable elements that provide

primarily “local” benefits although they would also contribute to the spatial

extent and functional value of various Everglades natural resources. These

management measures include:

• Seepage management buffers – areas that would “catch” seepage waters

and keep seepage waters from surrounding lands.

• Aquatic deep water refugia – a place that is kept wet during dry down

that mobile organisms could use and that would keep a healthy “stock”

population (this measure is not intended to add any additional cost to the

project).

• Littoral zones – areas around the seepage canals where during high

water, vegetation would provide valuable habitat for aquatic species, as

well as absorb some of the nutrients.

• Stormwater treatment area (STA) – a water quality treatment area

associated with the reservoir to provide treatment of the additional

quantity of water to be delivered to the Everglades. The STA could be

designed to operate in conjunction with STA 3/4 or as a stand-alone

treatment cell. This draft PIR does not include any real estate,

engineering, design or construction costs for the proposed stormwater

treatment area, which will be included at a Planning level cost estimate in

the Final PIR. Current rough order of magnitude costs for the proposed

STA include an estimated real estate cost of $8,176,000 and cost estimates

for construction ranging from $57,800,000 to in excess of $150,000,000,

based on comparative costs of similar construction.

5.3.11.1 Seepage Management Buffers

In an effort to help manage seepage from the EAA Storage Reservoirs, it is

recommended that a seepage buffer 200 feet wide be created along the eastern,

northern and western exterior levees of the storage reservoirs to improve the

function of the seepage canals, and potentially provide a secondary benefit as

wildlife habitat. The seepage management buffer will contain a mosaic of

naturally vegetated wetland and terrestrial habitats, which offer the optimum

habitat for a high diversity of species. The buffer will include a 50-foot wide

bench and maintenance area along the toe of the levee to allow for equipment

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