Abstract:In 1997, Oregon enacted rules that define an unacceptable population-level risk as a >10% chance of ≥20% of the total local population receiving an exposure greater than the toxicity reference value. This rule applies to populations of plants and animals not listed as threatened or endangered. An operational procedure was developed to perform such population-level ecological risk assessments. This case study describes how this procedure was used to develop site-specific groundwater remedial action objectives f… Show more
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