Terrestrial eco-risk -- Details and compromises in exposure assessment and risk characterization at Rocky Mountain Arsenal
Conference
·
OSTI ID:37419
- Enserch Environmental Corp., Denver, CO (United States)
- Rocky Mountain Arsenal, Commerce City, CO (United States)
The soil and biota databases used to assess terrestrial eco-risk at Rocky Mountain Arsenal reflect considerable spatial variability in soil and biota tissue concentrations. The variability in soil concentrations reflects variability in historical uses of the 27-square mile site, in concentrations of the 14 contaminants of concern (COCS) in soil, and in the distribution of soil borings and surficial soil samples. The spatial variability in tissue concentrations results especially from collection of samples from locations that were biased toward areas associated with high COC concentrations or thought to be uncontaminated and from biota mobility. This variability plus the considerable uncertainty in associating biota tissue concentrations with their exposure soil concentrations resulted in considerable discussion and the development of an innovative and effective protocol for, using interpolated soil concentrations to estimate tissue concentrations that were compared to toxicity reference values for tissue and dose concentrations. Specific examples and the opportunity for discussion of the Endangerment Assessment Technical Subcommittee members` uncharted journey through literature surveys, parameter quantification, statistical nuances, exposure area soil concentration estimation, and development of a proportionality constant (e.g., a site-specific biomagnification factor) to link soil and tissue concentrations will be presented.
- OSTI ID:
- 37419
- Report Number(s):
- CONF-9410273--
- Country of Publication:
- United States
- Language:
- English
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