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Estimating Point Sources for Progress Scenarios: Conference Call Summary

Discusses methodology for estimating point sources for progress scenarios, comparing modeling of point and nonpoint sources, annual precipitation, and trends in WWTP flows and TN loads.

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Estimating Point Sources for Progress Scenarios: Conference Call Summary

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  1. Wastewater Workgroup Conference Call December 6, 2011

  2. Estimating Point Sources for Progress Scenarios • Issues/Concerns: • Comparable modeling of Point and NP sources for progress runs, milestones, Bay Barometer • NPS: estimates are based on 10-year average hydrology • PS: estimates are based on discharge flow data • PS flow discharge data is influenced by weather conditions • Accounting for reductions in recently upgraded facilities where discharge data is not available.

  3. Estimating Point Sources for Progress Scenarios • Actions Requested: • Provide feedback on proposed supplemental indicators • Provide feedback on methodology • Decide on flow averaging period • Decide on TN, TP for upgrade facilities where data is not yet available.

  4. Progress Scenarios – Flow Comparison Are we comparing Apples and Oranges? Qave Nonpoint Sources Qave Point Sources

  5. Precipitation vs Flows/Loads 2001 Prec = 37.43 inches 2007 Precip = 37.62 inches Annual Precipitation CY 2000 - 2010 2007 WWTP Flow = 536.3 mgd TN Load 12.67 M lb 2001 WWTP Flow = 515 mgd TN Load 14.94 M lb WWTP Annual Flows CY 2000 - 2010 General Trend: Dry years => Lower WWTP Flows Wet Years => Higher WWTP Flows

  6. Estimated WWTPs Flow Increase based on Population Growth

  7. Annual Upgraded WWTP Flows Annual TN Load

  8. Annual Upgraded WWTP Flows Annual Flow Weighted TN Concentrations Trend – Concentration decreases showing Progress

  9. Annual Upgraded WWTP Flows Annual Flow Weighted TN Concentrations Trend – Concentration decreases showing Progress

  10. Estimating Point Sources for Progress Scenarios • Proposed supplemental indicators • Use 10-year rolling average to estimate PS Loads • Use Actual TN, TP for facilities operating with upgrades for about a year • Use default TN, TP for facilities where data is not yet available

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