Update to Loxahatchee River Coordinating Council L-8 Reservoir Water Quality Flow-way 1 Water Delivery Test G-92 Structure Replacement September 29, 2008

L-8 Reservoir – August 2007

Parameters (Cell 3) Sampling Depth 0.5 m 6.5 m 12.5m Temperature 27.7 23.4 21.9 D.O. 8.83 6.79 4.39 Specific Conductance 2853 2817 2816 pH 8.3 8.1 7.8 TSS <3 TDS 1649 1644 1328 TKN .81 .97 .87 Tot. Kjeldahl N 0.81 0.97 0.87 Nitrate/Nitrite <0.005 0.123 0.130 Ammonia Total Phosphorus 0.006 0.008 0.023 Ortho-Phosphorus 0.002 0.005 Chlorides 442 614 633 Sulfate 165 229 236

0.5 m 6.5 m 12.5m Parameters (Cell 6) Sampling Depth Temperature 27.9 23.4 22.3 D.O. 10 7.36 5.01 Specific Conductance 3801 3809 3835 pH 7.9 7.7 7.6 TSS 5 3 <3 TDS 2275 2247 2317 TKN 1.12 1.07 1.15 Tot. Kjeldahl N 1.0 0.86 0.84 Nitrate/Nitrite 0.118 0.206 0.308 Ammonia <0.005 0.009 Total Phosphorus 0.010 0.018 0.022 Ortho-Phosphorus <0.002 Chlorides 943 895 914 Sulfate 347 329 334

Results Similar to historical for WY 05 – WY 08 Lower concentrations of nutrients in cells than in either L-8 or M-Canal No metals exceeded WQ criteria Class I/III criteria exceeded for: Specific conductance, TDS, Chlorides and Gross Alpha Levels comparable to current cell historical levels – levels of parameters in exceedence are expected to decrease as reservoir is operated

Mixing Zone Boundaries Site Unit n Average Minimum Maximum L8MZBN µS/cm 20 768 489 978 L8MZBS 569 480 695

FLOW-WAY 1 TEST PURPOSE: To test water delivery from the regional water system to the Loxahatchee River Basin using the existing infrastructure TEST DATE - July 1 – July 3, 2008

Grassy Waters Preserve – M Canal Flow-way #1 G-160 Northlake Bridge Control #2 Pump Station G-161 M Canal Widening Grassy Waters Preserve – M Canal

TEST CRITERIA Establish baseline stages/flow rating curves Control GWP releases to limit effect on apple snails Release ~150 cfs at Control 2, 100 cfs at G-161, 100 cfs to NWFLR Maintain appropriate stages at GWP, G-161 and G-160 Ensure coordination with stakeholders Measure water flow at critical locations Obtain water quality samples during test

Calculated Daily average flow (cfs) RESULTS DATE Calculated Daily average flow (cfs) CTRL 2 G-161 G-160 G-92 Lainhart Dam 7/1/08 147 41 73 110 128 7/2/08 91 160 138 200 7/3/08 143 50 206 71 215

Measured Flows DATE Flow Station Ctrl 2 G-161 G-160 E. Perimeter Canal 7/2/08 150 - 100 35 7/3/08 95 80

Measured Avg. Daily Water Levels DATE Stage Elevation (feet NGVD) GWP (G-161 HW) G-161 TW G-160 HW 7/1/08 18.18 16.14 15.03 7/2/08 18.04 17.12 15.13 7/3/08 18.15 17.10 14.98

Conclusions Confirmed that if replacement water is available, structures can be operated to deliver flow Confirmed 150 cfs at control 2, but only 35 cfs at E. perimeter canal G-161 operated to deliver 100 cfs to C-18 Flow to NWFLR exceeded 100 cfs during test period Each structure is critical and operation must be synchronized to achieve results Measured flows agreed with estimated

G-92 Structure Replacement

G-92 Structure Proposed Design & Location New in-kind (single barrel, box culvert) will be installed to maintain flood protection and conveyance Located adjacent to existing structure Existing structure to be demolished

G-92 Structure Background Structure supplies water from the C-18 canal to the Loxahatchee River via the South Indian River Drainage District canal C-14 Erosion and structure deterioration has limited structure capacity Failure of the existing structure became critical during 2004 hurricane season

G-92 Structure Benefits of New Structure Reliability Extended service life Remote operation Public safety Flood protection Water delivery

G-92 Structure Operation New structure will not deviate from existing operational criteria. Remote operation through telemetry

G-92 Structure Replacement Schedule Bid opening scheduled for September 29, 2008 at 2:30 p.m. Construction start – late November to early December 2008 Construction time frame - 300 days