Consider Central Tendency Risk Results and Alternative Land Reuse Scenarios Before Soil Remediation. Julie C. Cozzie, ABB Environmental Services, Inc., 2120 Washington Blvd, Suite 300, Arlington, VA 22204
A Focused Risk Assessment (FRA) was conducted to assess whether or not contamination in the surface soil at a Navy installation posed potential health risks to individuals under the proposed land reuse scenario - mixed residential/commercial in the absence of remediation. The FRA was conducted in a phased approach - if the future reasonable maximum exposure (RME) residential scenario resulted in unacceptable risks, then the risks under a central tendency (CT) scenario (a combination of average and 50 or 90 percentile exposure parameters) were evaluated. Recreational and industrial land use scenarios also were evaluated as potential land reuse alternatives. This two-phase FRA was intended to assist decision makers in evaluating land reuse alternatives and determining the need for further remedial actions (including no further action). The FRA consisted of five components: data evaluation, identification of chemicals of potential concern (CPCs), exposure assessment, toxicity assessment, and risk characterization including an uncertainty analysis. Collectively, these components were used to identify site-related contaminants, estimate the potential magnitude of exposure and the resulting risk, propose remedial alternatives, and estimate remediation costs. Analytical results from thirty-three surface soil samples were screened against USEPA and State screening values. Inorganics were screened against background levels. Benzo(a)pyrene, dibenz(a,h)anthracene and arsenic w . . . . . . . [RiskWorld Note: Submitted abstract incomplete]