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| | Research HWIR Human and Ecosystem Site (Generic) Exposure-Risk Assessment Screening Model, EPA Exposure, US EPA |
 | | Both were / are considered important definitions in regulating the disposal of hazardous wastes consistent with reducing risk to human health and the environment; however, since they apply regardless of the concentrations or mobilities of hazardous constituents associated with the solid wastes, the potential for over-regulation is a possibility. |
 | | The conceptual foundation of the technical approach to achieving the HWIR goals is the risk paradigm and the associated relationship between a source of contaminant, its release to and transport through the environment, subsequent contact (i.e., exposure) with human and ecological receptors, and the resulting risk of health effects. |
 | | The assessment of potential human and ecological health risks will be site-based and include, for each site statistically sampled from a national database of WMUs, the simultaneous release of chemicals from the WMU to each environmental medium, the fate and transport of the chemical through a multimedia environment, and the receptor-specific exposures that result. |
| www.epa.gov /nerl/research/1999/html/g5-3.html (1075 words) |
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