flow-way was off-line for half of WY2010 due to Compartment C construction activities. A major earthwork project was completed in the southern portion of STA-5 Cell 1A in early 2009 to fill in a west-to-east oriented slough and improve flow distribution and performance in this cell. Approximately 80–100 acres of the slough were filled with ~400,000 cubic yards of material obtained form a borrow area immediately to the west of the treatment cell. Conversion from emergent to submerged aquatic vegetation (SAV) has been completed in STA-1W Cell 3 (WY2009), is continuing in STA-3/4 Cell 1B, and has been initiated in STA-2 Cell 2. Large-scale bulrush planting was conducted in WY2009–2010. Planted areas included STA-5 Cells 1A and 1B; STA-1E Cells 5, 6, and 7; STA-1W Cells 5A and 5B: and STA 3/4 Cell 1A.
Observed Benefits: Since 1994, the Everglades Construction Project (ECP) STAs have retained more than1,400 metric tons (mt) of total phosphorus (TP) that would have otherwise entered the Everglades Protection Area, reducing TP loads by 60–86 percent.
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 a retention/detention zone, replacement of the Taylor Slough Bridge, and removal of 4.75 miles of spoil mounds along lower C-111. Two construction projects were recently completed and transferred to the sponsor; the S-331 Command and Control Center and the southern retention/detention center. Construction contracts were initiated in 2008 to complete earthwork for the detention flowway linking the B and C pump station detention areas. This extension expands the effective area being used to build a hydrologic barrier between Everglades National Park (ENP) and the L-31N Canal to reduce seepage losses from ENP. A construction contract to extend the S-332B North detention area and contain discharges from the 8.5 square mile area (SMA) STA component of the modify water delivering (MWD) project is anticipated in 2012.
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.