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Analyses in Support of the Development of the PBT Monitoring Strategy

Analyses in Support of the Development of the PBT Monitoring Strategy. Tim Watkins and Stan Durkee EPA / ORD. Purpose. Currently, we are undertaking analyses addressing mercury, dioxin and PCBs to:

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Analyses in Support of the Development of the PBT Monitoring Strategy

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  1. Analyses in Support of the Development of the PBT Monitoring Strategy Tim Watkins and Stan Durkee EPA / ORD PBT Monitoring Strategy Workshop

  2. Purpose • Currently, we are undertaking analyses addressing mercury, dioxin and PCBs to: • Enhance our understanding of current monitoring programs addressing various media and the extent to which partnerships and information-sharing exist; • Assess these PBT monitoring programs against our draft Strategy objectives; and, • Provide insight and information to help refine our draft Strategy objectives. PBT Monitoring Strategy Workshop

  3. Specific Analyses • Assessment of current monitoring programs. • Evaluation of Hg monitoring sites in one network using modeled Hg deposition values. • Investigation of EPA fish tissue study design. • Dioxin modeling exercise. PBT Monitoring Strategy Workshop

  4. A Multimedia Matrix for Monitoring Selected PBTs (An Analytical Tool) PBT Monitoring Strategy Workshop

  5. Initial Focus on Mercury • A lot of interest and activity • Data availability • Major monitoring programs in all media PBT Monitoring Strategy Workshop

  6. Mercury Monitoring • Can national strategy objectives be developed for individual media? • Can national strategy objectives be developed to link multimedia monitoring systems? • To help answer these questions, we are first examining the mercury deposition network (MDN). PBT Monitoring Strategy Workshop

  7. Mercury Deposition Network • A collaborative network sponsored by over 100 state and federal agencies, native American tribes and others. • In 2000, more than 50 sites in operation. • Collects weekly wet-only samples of precipitation at sites worldwide, analyzing total mercury (also methylmercury at 1/3 of the sites). PBT Monitoring Strategy Workshop

  8. Modeling Can Support Monitoring Design • EPA modeled, using RELMAP, the domestic long range transport of U.S. emissions and reported the results in the 1997 Mercury Study Report to Congress. • For this analysis, we have evaluated MDN monitoring sites against our Strategy objectives using the modeled results of Hg wet deposition. • A detailed description follows this presentation. PBT Monitoring Strategy Workshop

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