included removal of the phosphorus-rich accrued layer that includes highly flocculent material, removal of tussock material, ground leveling to reduce flow constriction or short-circuiting, and rice planting to stabilize the soils. In early WY2008, a major submerged aquatic vegetation (SAV) inoculation effort was conducted using SAV harvested from STA-2 Cell 3 and deposited into STA-1W Cells 2B and 3.
Observed Benefits: Since 1994, the ECP STAs have retained over 900 mt of total phosphorus (TP) that would have otherwise entered into the Everglades Protection Area, reducing TP loads by 70 percent and phosphorus concentrations from an overall annual flow-weighted mean (FWM) TP of 145 parts per billion (ppb) down to 45 ppb.
Start Date: Authorized in 1994, Everglades Forever Act
Current Estimated Completion Date: Not available
Original Estimated Cost: $825M
Current Estimated Cost: $836.2M
Status: Currently, two interim pump stations and one permanent pump station have been completed, along with construction of three detention areas, replacement of the Taylor Slough Bridge, and removal of 4.75 miles of spoil mounds along lower C-111.
A land exchange of approximately 1,000 acres between Everglades National Park and the SFWMD was approved by Congress and executed in 2005. The project management plan (PMP) is being updated to detail and refinements in the design and accompanying costs and schedule. A supplemental Project Cooperation Agreement (PCA) to address the 50/50 cost share is forthcoming.
Construction of the earthwork for the retention/detention area is scheduled to be complete by September 2008. Construction on the S-331 command and control facility (cost shared with the Mod Waters project) is scheduled to be complete in March 2009. A construction contract to extend the S-332B north detention area and contain discharges from the 8.5 Square Mile Area STA component of the Mod Waters project is expected in 2010.
Observed Benefits: Not yet fully implemented. Distribution of flows has improved downstream of the Taylor Slough bridge replacement and C-111 spoil mounds removal areas.