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CBP Principals’ Staff Committee Meeting Lancaster, Pa. April 30, 2010

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Bay Water Quality Responses to Simulated Nutrient and Sediment Load Reductions: Findings and Recommendations Presentation VIII-A. CBP Principals’ Staff Committee Meeting Lancaster, Pa. April 30, 2010. Bob Koroncai Lewis Linker USEPA. Presentation Preview.

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Bay Water Quality Responses to Simulated Nutrient and Sediment Load Reductions: Findings and RecommendationsPresentation VIII-A

CBP Principals’ Staff Committee Meeting

Lancaster, Pa.

April 30, 2010

Bob Koroncai

Lewis Linker

USEPA

presentation preview
Presentation Preview
  • Nutrients: Dissolved Oxygen and Chlorophyll ‘a’ Criteria Attainment
    • Past decisions
    • Current model results
    • Next steps toward full attainment: decision
  • Sediment: Clarity and SAV Attainment
    • Current model results
    • Next steps towards full attainment: decision
remember in october 2009 the psc agreed to a basin wide target loads of
Remember, in October 2009 the PSC agreed to a basin-wide target loads of…

15 mpy

Phosphorus

200 mpy

Nitrogen

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PSC Told in October The Recommended Basinwide Loads Will Change Due to…
  • Updated critical period
  • Upgraded watershed model (Phase 5.2 to 5.3)
  • Filter feeder inclusion in the WQ model
  • Atmospheric deposition allocation and impact on ocean load
  • Modified assessment procedures for Bay criteria
  • SAV/clarity target load analysis
  • Trade-offs between N and P
  • Loading reductions needed to meet local Bay segments
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DO Stoplight Plot Summary Information

Violation Count >1% for the ’93-’95 Critical Period

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DO Non-attainment – All Scenarios

Violation counts based on >1% for the ’93-’95 critical period

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Deep-Channel Use Dissolved Oxygen at Current Target Loads

(200 TN, 15 TP+ 15.7 air allocation)

  • Non-attainment in 3 segments (>1%)
    • CB4 (2%)
    • Lower Chester (14%)
    • Eastern Bay (4%)
  • 1 segment at <1%
  • Reaching attainment will require further reductions in nutrient loads from larger Bay watershed
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Deep-Water Use Dissolved Oxygen at Current Target Loads

(200 TN, 15 TP+ 15.7 air allocation)

  • Non-attainment in 2 segments (>1%)
    • Lower Chester River (3%)
    • Magothy (16%)
  • 4 segments at <1%
  • Reaching attainment will require further reductions in nutrient loads from basinwide and local watershed scales
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Open-Water Use Dissolved Oxygen at Current Target Loads

(200 TN, 15 TP+ 15.7 air allocation)

  • Non-attainment in 15 segments (>1%), ex:
    • Pocomoke (25%)
    • Anacostia (16%)
    • Wicomico (15%)
    • Severn (6%)
    • Lower York (3%)
  • 8 segments at <1%
  • Reaching attainment will require further reductions in nutrient loads from local watershed scales
dissolved oxygen chlorophyll where do we go from here
Dissolved oxygen/chlorophyll:where do we go from here?
  • Identify loads to achieve full attainment
    • Identify non-attaining segments
    • For each non-attaining segment:
      • Identify watershed(s) having the most influence on tidal water quality
      • Identify loadings needed to fully attain
      • Understand any other factors contributing to sustained non-attainment (beyond E3)
  • PSC agreement with this approach?
slide12
Clarity/SAV Non-attainment

Violation counts based on >1% for the ’93-’95 critical period

clarity sav where do we go from here
Clarity/SAV:where do we go from here?
  • Confirm assessment procedures fully consistent with states’ WQ standards regulations
  • Identify loads to achieve full attainment
    • Identify non-attaining segments
    • For each non-attaining segment:
      • Diagnosis major contributor(s) to reduce water clarity: nutrient, sediments
      • Identify watershed(s) having the most influence on tidal water quality
      • Identify loadings needed to fully attain
      • Understand any other factors contributing to sustained non-attainment (beyond E3)
  • PSC agreement with this approach?
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When?
  • State/basin nutrient allocations by July 1
  • State/basin sediment allocations by August 15
nutrient and sediment summary
Nutrient and Sediment Summary
  • Need to refine state/basin nutrient allocations by meeting WQS in ‘local’ segments
  • Much sediment attainment achieved with P controls planned
  • Need to commit to extensive review in June (N/P) and July/August (S)
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