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2012 Biennial Assessment of Ohio River water Quality Conditions

305b report. 2012 Biennial Assessment of Ohio River water Quality Conditions. Draft assessments provided to states’ 305b Coordinators by year-end. Use the most current data possible. All data used in assessments not yet available. BacT, fish tissue & biological assessments.

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2012 Biennial Assessment of Ohio River water Quality Conditions

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  1. 305b report 2012 Biennial Assessment of Ohio River water Quality Conditions

  2. Draft assessments provided to states’ 305b Coordinators by year-end. • Use the most current data possible. • All data used in assessments not yet available. • BacT, fish tissue & biological assessments. • TEC signs off on assessments at Feb meeting. • Draft report completed for June TEC mtg. Schedule

  3. Conflicting data sets involving: • Iron water violations of AL criteria vs. biological assessments using fish index. • Mercury water violations vs. fish tissue violations. • TEC action at last meeting directing staff to utilize weight of evidence approach in 2012 assessment. Using Weight of Evidence Approach

  4. Iron Criteria Violations Indicate impairment

  5. Aquatic Life Use Indicates No Impairment

  6. Water Quality Violations: Total Hg

  7. 2010 Methylmercury Fish Tissue Data

  8. QUESTIONS?

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