Multimedia Environmental Pollutant Assessment System,

McDonald JP, Gelston GM (1998) Description of the multimedia environmental pollutant assessment system (MEPAS, version 3.2), with application to a hypothetical soil contamination scenario. J Soil Contam 7(3) 283-300... 

Remedial Action Priority and Multimedia Environmental Pollutant Assessment Systems... 

The Remedial Action Priority System (RAPS) and Multimedia Environmental Pollutant Assessment System (MEPAS) are different names for an objective exposure pathway evaluation system developed by Pacific Northwest Laboratory to rank chemical and radioactive releases according to their potential human health impacts. Constituent migration and impact are simulated using air, groundwater, overland, surface water, and exposure components based on standard assessment principles and techniques. A shell allows interactive description of the environmental problem to be evaluated, defines required data in the form of problem-specific worksheets, and allows data input. The assessment methodology uses an extensive constituent database as a consistent source of chemical, physical, and health-related parameters. 

Pacific Northwest Laboratory has developed health impact assessment systems, the Remedial Action Priority System (RAPS) and the Multimedia Environmental Pollutant Assessment System (MEPAS), for the U.S. Department of Energy (DOE) to evaluate the relative importance of environmental problems. RAPS, which was developed first, applies to releases from inactive waste sites. MEPAS, the most recent version of the system, allows consideration of releases from both active and inactive sites. MEPAS differs from RAPS mainly in terms of the types of emission options. Although MEPAS retains the documented framework of RAPS (1), several enhancements have been added to the transport and exposure components (2). 

Hoopes, B. L. Walter, M. B. Supplemental Mathematical Formulations The Multimedia Environmental Pollutant Assessment System (MEPAS) PNL-7201, Pacific Northwest Laboratory, Richland,... 

Droppo, J. G. Jr. Strenge, D. L. Buck, J. W. Hoopes. B. L. Brockhaus, R. D. Walter, M. B. Whelan, G. Multimedia Environmental Pollutant Assessment System (MEPAS) Application Guidance Volume 1 - User s Guide PNL-7216, Pacific Northwest Laboratory, Richland, Washington, 1989. 

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