Residual Risk Data Quality Issues. D. A. Amaral, EC/R Incorporated, 1129 Weaver Dairy Road, Chapel Hill, NC 27514; M. G. Dusetzina, US EPA/OAQPS (MD-15), Research Triangle Park, NC 27711; and S. A. Walata, EC/R Incorporated, 1129 Weaver Dairy Road, Chapel Hill, NC 27514
Section 112(f) of the Clean Air Act Amendments (CAAA) requires EPA to promulgate, within 8 years after promulgation of MACT standards for hazardous air pollutants, standards to protect public health and the environment. The first MACT standard was promulgated in 1993, and EPA must determine if additional controls are required for each source category under MACT. The MACT standard development process is focused on identifying the best available control technology to reduce emissions of hazardous air pollutants at sources. The residual risk assessments will require speciated hazardous air pollutant emissions data for sources within individual facilities in each source category, as well as data on the release parameters for each source, to support site-specific dispersion modeling and multi-pathway risk analyses. This paper describes our experience identifying the requisite input data for residual risk assessment across several source categories. We review the quality, for purposes of residual risk assessment, of information found in sources such as the Toxics Release Inventory (TRI), National Toxics Inventory (NTI), Aerometric Information Retrieval System (AIRS), Background Information Documents (BIDs) and dockets to support the MACT rules, and State air permits. The implications of the status of input data for the analysis of uncertainty and variability in the risk assessments are discussed.
Funded by the U.S. EPA under Contract 68-D6-60065.
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