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Ames Nutrient Reduction Strategy for Watershed Land Use Practices

Explore the implementation of the Iowa Nutrient Reduction Strategy in Ames, focusing on the City's water pollution control facility, infrastructure investments, and the use of urban and rural Best Management Practices (BMPs) to reduce nutrients. The feasibility study suggests a two-pronged solution involving technology conversion at the facility and investment in BMPs for long-term nutrient reduction benefits.

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Ames Nutrient Reduction Strategy for Watershed Land Use Practices

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  1. Watershed Land Use Practices as a part of the Iowa Nutrient Reduction Strategy Response for the City of Ames John Dunn, Director

  2. About the Ames Water Pollution Control Facility • 20 MGD Trickling Filter/Solids Contact Facility • Built in 1989 • 29+ Years of Perfect Permit Compliance

  3. Iowa NRS Goals 45% Reduction in Nutrients Leaving the State Point Sources: Biological Nutrient Removal (BNR) 75% Phosphorus Reduction 67% Nitrogen Reduction Phosphorus Ames Current Performance: 19% Phosphorus Reduction36% Nitrogen Reduction Nitrogen

  4. Infrastructure Investments Media Inside

  5. “Is There a Reasonable Nonpoint Source Component to our Facility’s Strategy?”

  6. Conclusions of Feasibility Study Wholesale technology replacement was only practical course of action. Not practical for nonpoint practices to entirely offset the need for WPCF reductions. The City has, and should continue, to pursue land use BMPs that provide nutrient reduction as ancillary benefits.

  7. Two-Pronged Solution • Undertake Phased Construction of Technology Conversion at WPCF • Three phases over 20 years • Replaces existing infrastructure based on anticipated remaining useful life • Ultimately will meet goals of Iowa NRS (75% TP and 67% TN reductions)

  8. Two-Pronged Solution • Undertake Phased Construction of Technology Conversion at WPCF • Three phases over 20 years • Replaces existing infrastructure based on anticipated remaining useful life • Ultimately will meet goals of Iowa NRS (75% TP and 66% TN reductions) • Invest in Urban and Rural BMP’s • Locations that benefit sewer rate payers • Quantifiable nutrient reduction • Ancillary benefits

  9. Overall Project Cost & Rate Impacts • $39.9 million in capital work over 20 years • $4 million in watershed BMP’s over 20 years • Net sewer rate impact:15-20%

  10. John R, Dunn, PE, MBA Director, Ames Water & Pollution Control Department 515-239-5150 jdunn@cityofames.org

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