Projects:
Mercury
Report to the U.S. EPA
Client: Tetra Tech EMI - Dallas, TX - EPA Region 6
Location: U.S. EPA Region 6
Period: 2000-2001
Under commission from the U.S. EPA, Lakes Environmental developed a method to properly partition elemental mercury, divalent mercury (Hg++), and methyl mercury (MHg). Previously, the mercury soil and waterbody partitioning model in the U.S. EPA Human Health Risk Assessment Protocol would deviate from observed values. After extensive literature reviews and analytical mass balances an updated mercury model was suggested by Lakes Environmental, which was subsequently incorporated into the national risk assessment protocol.
This study was part of a larger analysis of multi-pathway site-specific human health risk assessment. Data Quality Objectives for this work were to analyze the current state of the science and basis for EPA method and policy regarding analytical testing, speciation issues, risk characterization, and fate and transport modeling of emissions of problematic metals such as mercury, nickel, and chromium.
As part of this study extensive knowledge was gained on the sensitivity and technical basis for EPA assumptions, which govern numerically indirect risk characterization of emissions containing metals and semi-volatile compounds.
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