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Section 7 Environmental Effects of the Selected Plan

EAA Storage Reservoirs Revised Draft PIR and EIS February 2006

7-18

7.12.2 Caloosahatchee River and Estuary

The Preferred Alternative will reduce the number of regulatory releases from

Lake Okeechobee to the Caloosahatchee Estuary. High volume releases of water

discharged from Lake Okeechobee to the Gulf of Mexico through the

Caloosahatchee River are very damaging to the estuary. The proposed action

will reduce these discharges by storing excess runoff from Lake Okeechobee in

the proposed reservoir system and releasing the water to the south rather than

the west. This will reduce the levels of non-point source pollutant loading to

basin waters during the wet season, in general, and Lake Okeechobee flood

control discharges in particular. The slightly improved water quality of Lake

Okeechobee will result in a corresponding reduction in pollutant loads to the

Caloosahatchee Estuary. In this way, the Preferred Alternative will provide

some improvement for the submerged aquatic vegetation, oysters, fish, and other

fauna in this estuary. The effect of the proposed reservoir is diluted by the

volume of freshwater from Caloosahatchee basin runoff that will not be affected

by the Preferred Alternative.

7.12.3 St. Lucie River and Southern Indian Lagoon Estuary

The Preferred Alternative will reduce the volume of regulatory releases from

Lake Okeechobee to the St. Lucie Estuary. This will provide significant

improvement for the 922 acres of the St. Lucie Estuary affected by the releases.

This will reduce damage to the submerged aquatic vegetation, oysters, fish, and

other fauna in this estuary.

7.12.4 Everglades Protection Area (EPA)

The volume, timing, and quality of water delivered to the EPA will be greatly

improved by implementation of the proposed action. Significantly more water of

higher quality is planned to be released into the EPA over current conditions.

The proposed storage reservoir will receive water from Lake Okeechobee. That

water may be used for irrigation in the EAA and/or released through STAs to the

EPA. In addition to the anticipated supplementary total phosphorus removal to

be achieved by the ECP STAs, southerly flows from Cell #2 may be directed

through the proposed adjacent STA. If this wetland treatment yields effluent

consistent with the Everglades Forever Act criteria, these reservoir flows may be

routed directly to the EPA, At times when project STA effluent does not comply

with EFA limits, project STA flows may be routed to yet another ECP STA so

that flows to may be treated to required levels. Not only will the flow to the EPA

be increased, but peak flows will be reduced, thereby reducing the impact upon

the EPA ecosystems. Further, the regulation schedule for storage reservoir will

provide a more consistent supply of water to the STAs, thereby allowing them to

be more efficient in reducing contaminant concentrations before release to the

EPA.

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