Legacy P. Task 1: Search and Review of Existing Information. Task 2: Evaluation of Existing Information

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1 Legacy P Task 1: Search and Review of Existing Information Task 2: Evaluation of Existing Information Task 3: Additional Data Acquisition or Legacy P Abatement Plan Definition Phosphorus within the watershed that is present as the result of anthropogenic activities and has transport potential to Lake Okeechobee

2 Sources and Location of Legacy P? SOILS / UPLANDS Fertilizer Ag Res Feed / Manure Beef Dairy BioSolids Septic Fields WETLANDS Fertilizer Feed / Manure Septic / BioSolids DITCHES / STREAMS Fertilizer Feed / Manure Septic / BioSolids CONTAINMENTS (low mobility) Waste Ponds Septic Tanks Landfills

3 Forms of Legacy P Native / Antecedent Impacted by Legacy P SOILS / UPLANDS Soluble P (PO 4 / Organic) Organic P Fixed P (Embedded) Adsorbed or Bonded P WETLANDS Soluble P (PO 4 / Organic) Adsorbed or Bonded P Organic P Fixed P (Embedded) DITCHES / STREAMS Relative Amount Adsorbed or Bonded P Organic P Fixed P (Embedded) Soluble P (PO 4 / Organic)

4 Transport Processes FRESH ORGANIC P YIELD PLANT P ROOT P HARVEST FERTILIZER P MINERALIZATION ORGANIC HUMUS P MINERALIZATION IMMOBILIZATION STABLE INORGANIC P MINERALIZATION SEDIM ENT SEDIM ENT LABILE P UPTAKE ADSORPTION/ DESORPTION ACTIVE INORGANIC P RUNOFF SEDIM ENT PERCOLATION 75% MINERALIZATION SEDIM ENT ORGANIC P (Animal Waste) SEDIM ENT 25% MINERALIZATION

5 Transport Processes SOILS / UPLANDS WETLANDS STREAMS RUNOFF TO LAKE A E Interflow H2O / Plants Detritus H2O / Plants OKEECHOBEE Bh Parent Sediment C Deep Seepage

6 Quantification of Legacy P Estimated Legacy P by Land Use and Soil Layer Based On Field Research and Soil Testing Landuse Legacy P Horizon A E and Below (kg/ha) (kg/ha) Native Areas 0 0 Isolated Wetlands in Pastures Impacted Sloughs Semi-Improved Beef Pasture Improved Beef Pasture Hayland Dairy Dry Cow Pastures Dairy Sprayfields Dairy Intensive Lactating Pastures Dairy High Intensive Holding Pastures Abandoned Dairy Intensive Vegetables Citrus Overall Dairy - Active Overall Dairy - Abandoned Sod 0 20 Ornamentals Sugarcane 0 0 Poultry Isolated Wetlands in Dairy Pastures

7 Quantification of Legacy P Estimated Urban Legacy P Levels Urban Sewage and Fertilization Assumptions for Legacy P Waste Load 265kg/person/day P in Waste Load % P Load kg/person/day Landuse People Time of P Septic Runoff P Legacy P Category Density Accumation Fertilizer Load A horizon Lower Horizon* (# / ha) (yrs) (kg/ha/yr) (kg/ha/yr) (kg/ha/yr) (kg/ha) (kg/ha) Low Density Medium Density High Density Industrial Commerical Recreational

8 Quantification of Legacy P

9 Distribution of Legacy P

10 Distribution of Legacy P Total of Legacy P by Region for the "A" Horizon

11 Distribution of Legacy P Total of Legacy P by Region for the E" Horizon and Below

12 Distribution of Legacy P Total of Legacy P by Land Use for the A" Horizon

13 Distribution of Legacy P Total of Legacy P by Land Use for the E" Horizon and Below

14 Distribution of Legacy P Estimated Relative Legacy P for Hydrologic Reaches Based on Stream Sediment Studies and Land Use Characteristics of Accumulative Contributing Areas

15 Tasks 1&2. Summary & Conclusions Legacy P in Watershed = 190,000 mt At current P discharge levels it would take about 380 years to wash out the existing Legacy P Knowledge base for transport and abatement strategies is Quite Good

16 Task 3 Report Outline INTRODUCTION DEFINITION OF LEGACY P BACKGROUND OF LEGACY P OVERALL ABATEMENT STRATEGY AND ASSUMPTIONS LEGACY AND OTHER P SOURCES PHOSPHORUS CONTROL PRACTICES In-Field Agricultural BMPs In-Field Soil Amendments Edge-of-Field/Farm (EOF) Treatment Technologies Residential and Urban Facilities or Point Sources Regional In-Stream Treatment Technologies ESTIMATED IMPLEMENTATION LEVELS AND COSTS TO ACHIEVE TMDL TARGETS UNCERTAINTIES IMPLEMENTATION SCHEDULE REFERENCES

17 Overall Abatement Strategy & Assumptions First meet tributary TMDLs, then meet Lake Okeechobee TMDL TMDL Assumptions Lake Okeechobee = 40 ppb P Northern Basins = 113 ppb P Lake Istokpoga Basin = 55 ppb P Upper Kissimmee Basin = 55 ppb P

18 Surface Water Inflows, TP Concentrations, Loading Rates, and TMDL Targets for Lake Okeechobee Tributary Basins ( )

19 Develop Delivery Factors for Legacy P Assign Mobility Factors Apply and Check against Observed Data

20 Assumed Relative P Mobility Factors for Legacy P, Runoff Factors, and Estimated Native and Other Anthropogenic P Loads.

21 P Loads from Soil Based Legacy P for Various Land Uses

22 P Control Practices In-Field Field practices that address the legacy P and its mobility within the soil/plant environment. Edge-of-Field/Farm (EOF) Practices that treat and/or retain runoff as it is leaving a field or farm. Residential Practices applied within residential areas. Urban Practices applied within transportation/urban/commercial/industrial areas Facilities Practices used in non soil-based areas that potentially discharge P into runoff, such as industrial sites, packing houses, old land fills, etc. Regional Practices that treat and/or retain stream flows within the tributary system where multiple upstream landowners drain to the system.

23 Estimated Additional Wetland Based Regional Treatment Required to Meet Lake Okeechobee TMDL with and without Meeting Tributary TMDLs Estimated Additional Regional Chemical Treatment Required to Meet Lake Okeechobee TMDL with and without Meeting Tributary TMDLs

24 Estimated Additional Wetland Based Regional Treatment Required to Meet Lake Okeechobee TMDL with and without Meeting Tributary TMDLs Annual $1.1B $0.38B $0.55B $0.09B Capital $10B $3.4B $5.0B $.83B Estimated Additional Regional Chemical Treatment Required to Meet Lake Okeechobee TMDL with and without Meeting Tributary TMDLs

25 Estimated Additional Wetland Based Regional Treatment Required to Meet Lake Okeechobee TMDL with and without Meeting Tributary TMDLs Annual $1.1B $0.38B $0.55B $0.09B Capital $10B $3.4B $5.0B $.83B Estimated Additional Regional Chemical Treatment Required to Meet Lake Okeechobee TMDL with and without Meeting Tributary TMDLs Annual $0.34B $0.11B $0.17B $0.09B Capital $3.1B $1.0B $1.5B $.83B

26 Q & A