The U.S. Environmental Protection Agency's (EPA) lead attainment strategy for air is being expanded to address geographic areas with the potential for multimedia, multipathway exposures to lead.
Geographic Information Systems (GIS) technology is used to coordinate information from various databases to identify areas of potential concern.
The data retrieval and decision processes used in identifying priority sources from each medium and in evaluating identified areas of concern are described in this paper.
Only EPA databases with reliable locational information were used to facilitate accurate mapping and allow correlation with other data sources.
The sources of lead loadings to air, water, and soils were mapped using either latitude and longitude or zip code, or county centroids for data lacking longitudinal and latitudinal coordinates (such as the drinking water data).
A multimedia cluster of lead sources was identified at the county level, since all the facility data in the five databases could be mapped to this level.
An impact factor and weighting system was devised to combine the information on the number of facilities and their relative size in developing a ranking of the multimedia lead clusters of concern in each region.
The counties with the highest number of points were considered clusters of highest concern for multimedia lead sources.
Two separate lists of the clusters were developed according to a point system. (...)
Mots-clés Pascal : Etats Unis, Amérique du Nord, Amérique, Pollution, Métal lourd, Plomb, Inventaire source pollution, Gestion environnement
Mots-clés Pascal anglais : United States, North America, America, Pollution, Heavy metal, Lead, Pollution source inventory, Environmental management
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0138196
Code Inist : 001D16E. Création : 21/07/1998.