Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Multimedia Exposure Assessment Model Data Needs.
Author Hedden, Kenneth F. ;
CORP Author Environmental Research Lab., Athens, GA.;American Society of Civil Engineers, New York.
Year Published 1982
Report Number EPA-600/D-82-316;
Stock Number PB82-224148
Additional Subjects Environmental surveys ; Meetings ; Mathematical models ; Transport properties ; Air pollution ; Water pollution ; Runoff ; Public health ; Exposure ; Toxic substances ; Path of pollutants
Library Call Number Additional Info Location Last
NTIS  PB82-224148 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 12p
Multimedia exposure assessment models are being developed for the U.S. Environmental Protection Agency. Models are comprised of an atmospheric transport, degradation, dispersion and deposition module; a surface runoff module; and a surface water quality module. The modules are linked to describe the effect of airborne, land based, and water bourne toxic organic pollutants on surface water quality. The data required for the air module include such input parameters as the settling velocity, deposition velocity, washout ratio and Henry's Law constant for the specific chemical being considered as well as the usual meteorological data for the particular area being modeled. The surface runoff module will require data on the various physical watershed characteristics, which are related to topography, soil characteristics, land surface conditions, land use, etc. Individual storm hydrographs will also be required. The surface water quality module will need to simulate equilibrium partitioning of the toxic organic between dissolved, sediment adsorbed, or biomass adsorbed phases. Volitilization, hydrolysis, microbial transformation, photolysis, and oxidation need to be simulated. Environmental characterization of the surface water body would be required as well as the appropriate transformation rate constants and partition coefficients for the chemical being simulated.