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Mercury MapsMercury Maps is a tool that relates changes in mercury air deposition rates to changes in mercury fish tissue concentrations, on a national scale. The tool uses a reduced form of widely-accepted complex mercury fate and transport models as applied to watersheds in which air deposition is the sole significant source. The Mercury Maps model concludes that for long-term equilibrium conditions, the ratio of current to future air deposition rates will equal the ratio of current to future fish tissue concentrations. Mercury Maps can be used to to identify those waterbodies expected to attain state water quality standards as a result of air deposition reductions, or to perform Total Maximum Daily Load (TMDL) analyses for individual or multiple watersheds. Fact Sheet Overview Slides
Peer Reviewed Final Report - Mercury Maps: A Quantitative Spatial Link Between Air Deposition and Fish Tissue (PDF, 1.6mb, 61 pages) (September 2001) A report detailing the derivation of the Mercury Maps model as well as the selection and use of mercury source data layers. Peer-reviewed by EPA scientists, the report incorporates their comments and includes a response-to-comments document in the Appendix.
LinksBASINS: Better
Assessment Integrating Point and Nonpoint Sources National Listing of Fish
Advisories (NLFA): Fish
Tissue Human Health Water Quality Criterion for Methylmercury For more information on Mercury Maps, contact: Paul Cocca at US EPA, 1200 Pennsylvania Ave., NW (4305), Washington, DC 20460; e-mail: cocca.paul@epa.gov.
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Wastewater Management | Drinking Water | Wetlands, Oceans, and Watersheds |
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