The objective of this work is to provide the necessary information to assess the impact of controlling Hg from coal-fired utilities by examining the materials resulting from coal combustion, which are either disposed of or utilized. This will be accomplished by:

• Determining the Hg concentration in coal combustion waste streams, specifically bottom ash, fly ash, flue gas desulfurization sludge and solids (FGDS), and spray dryer solids (SDS)
• Estimating percentage of Hg collected in the coal combustion waste streams based on the Hg in the as-fired coal
• Determining if the Hg in the waste and by-product samples is leachable
• Determining if the Hg in the waste and by-product samples is volatile
• Evaluating the fate of Hg in coal fly ash in the manufacture of Portland cement
• Evaluating the fate of Hg in FGD gypsum in the manufacture of wallboard
• Evaluating the fate of Hg in the coal ash material used to make manufactured aggregate
• Compiling a literature review of Hg chemistry and transformations in ecosystems
• Evaluating the extent that Hg is leached and converted to methyl-mercury in sulfite sludge FGD landfill
• Evaluating the extent that Hg is leached and converted to methyl-mercury in fly ash slurry impoundments

The results will be reported to DOE through a final report.