Solving Water Pollution Problems in the Wakulla Springshed The City of Tallahassee’s Efforts to Reduce Stormwater Pollution Hydrogeology Workshop May 12-13,

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Presentation transcript:

Solving Water Pollution Problems in the Wakulla Springshed The City of Tallahassee’s Efforts to Reduce Stormwater Pollution Hydrogeology Workshop May 12-13, 2005

Water Quality and Stormwater Pollution City of Tallahassee shares the goal of preserving water quality with Leon and Wakulla Counties, FDEP, EPA, Friends of Wakulla Springs and all Stakeholders. City of Tallahassee shares the goal of preserving water quality with Leon and Wakulla Counties, FDEP, EPA, Friends of Wakulla Springs and all Stakeholders. Best accomplished through technically sound planning and goal setting. Best accomplished through technically sound planning and goal setting.

The Reality of Our Working Environment There are many competing needs for a community’s financial resources; fire, police, schools, roads….. There are many competing needs for a community’s financial resources; fire, police, schools, roads….. Managing and improving water quality is an expensive endeavor. Managing and improving water quality is an expensive endeavor. Due diligence must be used to ensure that the limited funding that is available, is effectively applied. Due diligence must be used to ensure that the limited funding that is available, is effectively applied. Failure to do so, actually works against the goal of preserving water quality. Failure to do so, actually works against the goal of preserving water quality.

City of Tallahassee’s – Stormwater Pollution Reduction Planning The objective -- maximize progress with focus on problem magnitude and remediation effectiveness. 140,000 acres modeled 145 discrete catchments

City of Tallahassee’s – Stormwater Pollution Reduction Planning Monitoring sites were used to characterize the pollution in runoff from different land uses.

City of Tallahassee’s – Stormwater Pollution Reduction Planning Typical monitoring site used to collect and measure the pollution in runoff.

TALLAHASSEE STORMWATER Nitrogen values Less than National and Statewide Averages Phosphorus, BOD, and TSS values Higher than National and Statewide Averages for Residential, Recreational and Open Land. Lower or equal to Statewide Averages for Other Land Uses. Metals values Less than National and Statewide Averages except for Pb

City of Tallahassee’s – Stormwater Pollution Reduction Planning Pollutant loading data was applied to the land use map across 140,000 acres. This enables quantification of pollutant loads by watershed.

City of Tallahassee’s – Stormwater Pollution Reduction Planning Pollutant Loading Model was combined with BMP data to develop a Program Cost Model. Done by evaluating actual pond sites and developing cost estimates and removal rates. Yielded cost curves for a variety of alternative program levels.

Target Watersheds Alternative Revenue limitations led to examination of alternative approaches. Identified 20 Target Watersheds with highest loadings.

Target Watersheds Alternative $60 million in investment over approx. 20 years Not a “end-all” solution but - a realistic start for what will be a long term effort. Even this approach presents challenges.

Tallahassee’s SW Utility Fee With W/Q Increase

Impact of $1.70 SW Fee Increase on 20 Largest Customers

Lake Lafayette Nutrient Removal Project Evaluation Continued Application of Conventional Stormwater Management Practices

Capital Cascades Trail Stormwater System Cost - $110 million. Part of City & County Blue Print 2000 Initiative. 15 New Ponds or Wetlands totaling 50 acres. Removes approximately  2000 lbs N / yr  600 lbs P / yr

Cost - $110 million. Part of City & County Blue Print 2000 Initiative. 15 New Ponds or Wetlands totaling 50 acres. Removes approximately  2000 lbs N / yr  600 lbs P / yr

Nutrient Removal Project Evaluation Application of Innovative Stormwater Management

Nutrient Removal with Algal Turf Scrubber Process

Highlights of Local Project Under Consideration Managed Aquatic Plant System Approximate Size = 12 ac. Harvest Cycle of 7 Days. Total Mass P Percent Removal 25 MGD Avg Daily Flow. Removal Considers Warm Season (243 da.) and Cool Season (122 da.) Reduced Performance Period. Compost Assumed to be Most Likely End Product.

Estimated Cost and Performance of Managed Aquatic Plant System ITEMWeems Pond NRF Bench Scale Testing$81,390 Capital Construction Cost$2,484,000 Annual Operation$252,000 Phosphorus Removal (Lbs/Yr)3,560 Annual Compost (Tons /Yr)331

Groundwater Nitrate Loading – Various Sources

Nitrate Loading – Stormwater

Nitrate in Tallahassee Stormwater Compared to Wakulla Springs ( )

Wakulla Springs - Nitrate Concentration vs. Flow Inverse relationship between flow and Nitrate concentration indicates that stormwater is not the likely source of high nitrate levels at Wakulla Springs.

Nitrate Loading – Wastewater Systems

Comparison of Sprayfield Nitrogen Load with Nitrogen Discharge at Wakulla Springs

Nitrate Loading – Septic Tanks

Comparison of Nitrogen Load From Sprayfield with Load from Leon and Wakulla County Septic Tanks

Comparison of Nitrogen Load from Sprayfield and Septic Tanks in Springshed Area

Septic Tanks – How To Manage Problem Perhaps limit proliferation – by ordinance - No central water w/o central sewer.

Questions? Solving Water Pollution Problems in the Wakulla Springshed Hydrogeology Workshop May 12-13, 2005