Overview of the Chesapeake Bay Prioritized Organic Toxics of Concern List Rich Eskin Greg Allen Chesapeake Bay Program Toxics Subcommittee.

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Presentation transcript:

Overview of the Chesapeake Bay Prioritized Organic Toxics of Concern List Rich Eskin Greg Allen Chesapeake Bay Program Toxics Subcommittee

Organic Toxics of Concern IC Meeting Prioritized Organic Toxics of Concern Previous list published as an Appendix in Toxics 2000 New analysis uses a scoring approach so that the TSC could determine which were of greatest concern STAC sponsored peer review workshop conducted May 2006

Organic Toxics of Concern IC Meeting Prioritized Organic Toxics of Concern Provide guidance to the TSC regarding pollutants to focus on As a source of information for others to use in their priority assessments A complete risk assessment of chemical contaminants in the Chesapeake Bay or its tributaries A definitive list of all chemicals that may impact the Chesapeake Bay or its watershed Prioritization of chemicals for regulatory consideration Intended uses:Not intended as:

Organic Toxics of Concern IC Meeting Prioritized Organics of Concern - Peer Review Team Susan Glassmeyer, PhD, EPA National Exposure Lab, Cincinnati, OH Gary Mills, PhD, Savannah River Ecology Lab, Aiken, SC Cliff Rice, USDA BARC, Beltsville, MD Samuel Rotenberg, PhD, EPA Region 3 Waste and Chemical Management Division, Philadelphia, PA

Organic Toxics of Concern IC Meeting Prioritized Organic Toxics of Concern Organics only Metals were not amenable to the method due to different properties of persistence, bioaccumulation, and toxicity A separate analysis will be needed for metals when EPA finalizes new guidance on risk assessment methodology

Organic Toxics of Concern IC Meeting Prioritized Organics of Concern - Classes Not Included Metals Agricultural pesticides and degradates – atrazine Polybrominated diphenyl ethers (PBDEs) Pharmaceutical and personal care products

Organic Toxics of Concern IC Meeting Prioritized Organic Toxics of Concern Method uses the following categories of information: –PBT-adjusted load estimates –Environmental presence –Presence above eco-thresholds –Programatic concerns (303d lists, fish consumption advisories) Scoring bins determined for each category

Organic Toxics of Concern IC Meeting Prioritized Organic Toxics of Concern - Results By Class PCB PAH Organophosphate pesticides – chlorpyrifos, malathion Organochlorine pesticides – DDT, chlordane, dieldrin, aldrin, DDE, endosulfans Other priority pollutants - dichlorobenzene

Organic Toxics of Concern IC Meeting Prioritized Organic Toxics of Concern - Results

Organic Toxics of Concern IC Meeting Prioritized Organics of Concern Decision for IC Questions and concerns ? Approval for intended uses ?