1. New Emphasis on Sediment Quality Objectives Water Board, SCCWRP, SFEI RMP Annual Meeting 2007

2. Water Board Policy Development 1989 Legislature amended Water Code –Sec 13392.6 Sediment Quality Objectives –“reasonable protection of beneficial uses” November Water Board hearing Chemistry - Biology – Toxicity Process driven by Scientific Steering Comm

3. Conceptual Framework Direct Effects Severity of Effect Potential for Chemically Mediated Effect Station Assessment BenthosToxicityChemistryToxicity Three lines of evidence (LOE) needed to assess direct effects of sediment contamination

4. Toxicity Line of Evidence

5. Benthic Community LOE - Steps Compile Data –Standardize taxonomy –Calculate abundance and other metrics Calculate Benthic Indices –Benthic Response Index (BRI) –Index of Biotic Integrity (IBI) –Relative Benthic Index (RBI) –River Invertebrate Prediction and Classification System (RIVPACS) Combine Index Scores

7. Benthic Community LOE - Steps Compile Data –Standardize taxonomy –Calculate abundance and other metrics Calculate Benthic Indices –Benthic Response Index (BRI) –Index of Biotic Integrity (IBI) –Relative Benthic Index (RBI) –River Invertebrate Prediction and Classification System (RIVPACS) Combine Index Scores

8. Chemistry Line of Evidence

9. Sediment Quality Lines of Evidence RESPONSE CHEMISTRY (Exposure) TOXICITY (Toxicity) BENTHOS (Disturbance) Equivalent to reference or control condition (1) Minimal Exposure NontoxicReference Slight change of uncertain statistical significance (2) Low Exposure Low Toxicity Low Disturbance Reliable difference generally regarded as significant (3) Moderate Exposure Moderate Toxicity Moderate Disturbance Highly reliable response of high magnitude (4) High Exposure High Toxicity High Disturbance

10. Direct Effects Station Assessment Unimpacted Likely Unimpacted Possibly Impacted Likely Impacted Clearly Impacted Inconclusive Six assessment categories 64 LOE Combinations 6 Assessment Categories MLOE Integration Framework

11. MLOE Conceptual Framework Direct Effects Severity of Effect Potential for Chemically Mediated Effect Station Assessment BenthosToxicityChemistryToxicity

12. Severity of Effect NontoxicLow ToxicityModerate Toxicity High Toxicity ReferenceUnaffected Low Effect Low Disturbance UnaffectedLow Effect Moderate Disturbance Moderate Effect High Disturbance Moderate Effect High Effect Benthos Toxicity

13. Potential Effects are Chemically Mediated NontoxicLow ToxicityModerate Toxicity High Toxicity Minimal Exposure Minimal Potential Low Potential Moderate Potential Low Exposure Minimal Potential Low Potential Moderate Potential Moderate Exposure Low Potential Moderate Potential High Exposure Moderate Potential High Potential Chemistry Toxicity

14. MLOE Conceptual Framework Direct Effects Severity of Effect Potential for Chemically Mediated Effect Station Assessment BenthosToxicityChemistryToxicity

15. Station Categories Unimpacted - no significant adverse impacts. Likely Unimpacted - some uncertainty from small disagreement among the LOE. Possibly Impacted - Small impacts or LOE disagreement cause substantial uncertainty. Likely Impacted - Evidence persuasive, some disagreement among LOE. Clearly Impacted - clear and severe adverse impacts Inconclusive - Large disagreement among the LOE

16. Station Assessment UnaffectedLow EffectModerate Effect High Effect Minimal Potential Unimpacted Likely Unimpacted or Inconclusive Low Potential Unimpacted Likely Unimpacted Possibly Impacted Moderate Potential Likely Unimpacted Possibly Impacted or Inconclusive Likely Impacted High Potential Likely Unimpacted or Inconclusive Likely Impacted Clearly Impacted Potential that Effects are Chemically Mediated Severity of Effect

17. Sec 305 (b) Report Test

18. Common Approach in Regions RegionToxicityBenthosChemistry NorthEohaustoriusRBI CA LRM CSI SFBEohaustorius RBI, IBI, RIVPACS, BRI CA LRM CSI SouthEohaustorius RBI, IBI, RIVPACS, BRI CA LRM CSI Common Tools: Eohaustorius, RBI, CA LRM & CSI

19. Results

22. LOE Responses (% Area) RegionResponseBenthosToxicityChemistry NorthAffected27171 SFBAffected388524 SouthAffected232843 Affected: Moderate or High response

23. Chemistry:Toxicity Relationships

24. Effect of Tool Differences on % Area Estimates RegionResponseToolsBenthosMLOE NorthAffectedAll2718 NorthAffectedCommon2718 SFBAffectedAll3896 SFBAffectedCommon85100 SouthAffectedAll2338 SouthAffectedCommon3640 Affected Benthos: Moderate or High response Affected MLOE: Possibly, Likely, or Clearly Impacted

25. RMP Response Implement Sediment Triad Regional Consensus on Indices Assessment of Toxicity Causes

26. Sediment Chemistry Classification Steps Compile Data –Calculate sums, estimate nondetects Calculate Chemistry Indicators (SQGs) –Chem-Tox: CA LRM (maximum probability of toxicity) –Chem-Benthos: CSI (weighted mean score) Combine Indicator Scores to Determine Chemistry LOE Category

27. Toxicity Classification Steps Compile Data –Normalize to control response –Statistical significance tests Apply Toxicity Classification Criteria –Amphipod survival (Eohaustorius estuarius) Determine Toxicity LOE Category

30. Statewide Condition

31. California Regions North 139 km 2 11% n = 27 SFB 1020 km 2 79% n = 40 South 135 km 2, 10% n = 314 Total = 1295 km 2

32. North 139 km 2 San Francisco Bay 1020 km 2 Unimpacted Likely Unimpacted Possibly Impacted Likely Impacted Clearly Impacted Inconclusive South 135 km 2 Regional Condition