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Water Resources Technical Committee

Water Resources Technical Committee. Chesapeake Bay Program Overview & Updates July 10, 2008 Tanya T. Spano. OVERVIEW. CBP – General Objectives & Timeline Bay Models – Updates & Applications 2030 Land Use Model Impairments & Nutrient/Sediment Loads 303(d) List of Impaired Waters

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Water Resources Technical Committee

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  1. Water Resources Technical Committee Chesapeake Bay Program Overview & Updates July 10, 2008 Tanya T. Spano

  2. OVERVIEW • CBP – General Objectives & Timeline • Bay Models – Updates & Applications • 2030 Land Use Model • Impairments & Nutrient/Sediment Loads • 303(d) List of Impaired Waters • Load Allocations • Bay TMDL(s) • 2030 Land User Model & Projections WRTC Business Meeting

  3. CBP – General Objectives & Timeline Principles: • Shared Urgency to Restore the Bay • Clear Communication & Common Message • Focus & Accelerate Implementation • Engage the Public About the Implementation Process • Legal Obligations Will Be Met • Improving & Applying the Latest Science • Flexibility of Sub-allocations within the Major Basins • Keep Healthy Waters Healthy Finalize Bay TMDL - by May 2011 WRTC Business Meeting

  4. Bay TMDL – Help Implementation? • Strengthens legal defense of NPDES limits • Provides stability for allocations • Provides opportunity for needed adjustments in 2003 allocations • Direct public dialogue to promote implementation WRTC Business Meeting

  5. Nutrient/Sediment Allocation Processes • 2003 Process • N&P caps to meet tributary & CB4 segment • Decision Rules • Equitable distributions to tributaries & states • Left sub-allocation decisions & Tributary Strategy implementation up to states • Bay TMDL Process • Reflect model updates/new data • Need to reflect/integrate sediment loads/impacts • Regulatory requirements limit discretion • Desire to preserve flexibility/trading & promote implementation • Is a UAA required? WRTC Business Meeting

  6. Bay TMDL Schedule • Define Required Load Caps - 2008 • For Bay • For Tidal Tributaries • For Nitrogen, Phosphorus & Sediment • To achieve attainment based on latest 303(d) lists • Evaluate various management scenarios • Climate Change & 2030 impacts – ‘Will Consider’ • Determine ‘if’ need to adjust cap and/or allocations • Assess if a Bay UAA is required • Agree on State/Tributary Allocations – 2009 • Sub-Allocations to Sources – 2009-2010 • Public Participation – Now through 2011 • Issue Final Bay TMDL – May 2011 WRTC Business Meeting

  7. Bay Models – Updates & Applications • Models • Airshed • Sediment Sheds • Watershed Model • Water Quality Model • Hydrodynamic • Living Resources • Updates/New Data: • Model elements/functions • Input data • BMP efficiencies • Land use / land cover • 2030 Land Use Model • Derived from WSM & other ‘growth/projection’ models • TMDL & Allocation Applications • WSM - STAC comments versus MD’s intentions • WQM – All Forested Baseline, Factor of Safety, & Averaging Period Concerns WRTC Business Meeting

  8. Impairments & Nutrient/Sediment Loads • 303(d) List of Impaired Waters • All derived from agreed upon Bay-specific water quality criteria and Designated Uses • For all tidal states (including DE) • DC – EPA approval expected July 2008 • MD – EPA approval expected August 2008 • CB4 –How to Address less than 100% attainment under a TMDL? • VA – EPA approval expected September 2008 WRTC Business Meeting

  9. Impairments & Nutrient/Sediment Loads • Load Allocations • Changes Required from 2003? • UAA Needed? • Decision Rules • State Allocations vs. sub-allocations to sources • Bay TMDL(s) • Margins of Safety – explicit vs. implicit • Baseline ‘All Forested’ Scenario • Regulatory Requirements for NPDES Permits – WWTP vs. MS4 • Decisions will set precedence for EPA for a major TMDL • Links to Tributary Strategies? • Accelerate implementation? WRTC Business Meeting

  10. 2030 Land User Model & Projections • CBP issued preliminary county-level landuse/population projections • COG staff provided COG region population data • Population projections from states • Developed current/future septic & sewered data • Ad Hoc Technical Steering Committee • Paul DesJardin, Tanya Spano, Norm Goulet • COG staff working with members to compare/verify against existing data & future projections • Concerns raised with WWTP projections & BMP/land use concerns WRTC Business Meeting

  11. 2030 Land User Model & Projections • Next Steps • Continue to review current data with COG members/agencies • Evaluate against other existing projections • Work through Ad Hoc SC to address critical regional issues/resolve major discrepancies • Implement Hybrid approach for WTTP projections • Suggest hybrid approach to CBP • Use most accurate information available from COG and its members • Use CBP calculations/logic where accurate information does not exist • Provide formal comments – Summer/Fall 2008 WRTC Business Meeting

  12. WASTEWATER FLOW PROJECTIONSPreliminary Comparisons WRTC Business Meeting

  13. WASTEWATER FLOW PROJECTIONSPreliminary Comparisons WRTC Business Meeting

  14. Wrap-Up • Information Questions? • Discuss Technical & Policy Issues after presentations • Consider various COG staff recommendations WRTC Business Meeting

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