Guidance for Conducting Risk Assessments and Related Risk ...

BJC/OR-55 Guidance for Treatment and Variability and Uncertainty in Ecological Risk
Assessments of Contaminated Sites (formerly ES/ER/TM-228)
This report offers guidance for the analysis and presentation of variability and
uncertainty in ecological risk assessments. This report discusses concepts of
probability in terms of variance and uncertainty, describes how these concepts
differ in ecological risk assessment and human health risk assessment, and
describes probabilistic aspects of specific ecological risk assessment techniques.
BJC/OR-80 Radiological Benchmarks for Screening Contaminants of Potential Concern for
Effects on Aquatic Biota at Oak Ridge National Laboratory, Oak Ridge,
Tennessee (formerly ES/ER/TM-226)
The radiological benchmarks in this report are to be used at the U.S. Department
of Energy’s (DOE) Oak Ridge Reservation (ORR) and at the Portsmouth and
Paducah gaseous diffusion plants as screening values only to show the nature and
extent of contamination and identify the need for additional site-specific
investigation. The screening values presented in this document include internal
and external exposures from parent isotopes and all short-lived daughter
products.
BJC/OR-112 Biota-Sediment Accumulation Factors for Invertebrates: Review and
Recommendations for the Oak Ridge Reservation
This report acquires contaminant uptake data from published and unpublished
literature, develops and presents biota-sediment accumulation factors and
regression equations for estimating chemical concentrations in benthic
invertebrates for use on the ORR, and compares these to contaminant uptake data
for emergent adult insects. The equations and accumulation factors presented in
this report facilitate the estimation of contaminant exposure experienced by
wildlife consuming flying insects on the ORR.
BJC/OR-133 Empirical Models for the Uptake of Inorganic Chemicals from Soil by Plants
This report develops soil-plant contaminant uptake models using published data
from soil contamination in the field and validates the models using measured
concentrations from two contaminated sites. This report provides a means to
estimate concentrations of the inorganic chemicals in aboveground plant
biomass, if only concentrations in soil are measured.
BJC/OR-157 An Investigation of, and Recommendations for, Statistical Comparisons Between
Site and Background, Both With and Without Censoring (DRAFT)
This report provides an evaluation of numerous statistical methods that may be
applied in order to determine whether sites are contaminated. This analysis relies
primarily on statistical considerations and on results of extensive computer
simulations that provide comparisons of the statistical tests under conditions that
are expected to apply when contamination exists and when it does not.
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