Risk Assessment Barter Island Radar Installation, Alaska.

This document contains the baseline human health risk assessment and the ecological risk assessment ERA for the Barter Island Distant Early Warning DEW Line radar installation. Fourteen sites at the Barter Island radar installation underwent remedial investigations Ris during the summer of 1993. The presence of chemical contamination in the soil, sediments, and surface water at the installation was evaluated and reported in the Barter Island Remedial InvestigationFeasibility Study RlFS United States Air Force Air Force 1994a. The analytical data reported in the RlFS form the basis for the human health and ecological risk assessment. The primary contaminants of concern at the 14 sites are diesel and gasoline from past spills andor leaks. The general location of the Barter Island radar installation is shown in Figure 1-1. The 14 sites investigated and the types of samples collected at each site are presented in Table 1-1. The purpose of the risk assessment is to evaluate the human and ecological health risks that may be associated with chemicals released to the environment at the 14 sites investigated during the RIs. The risk assessment characterizes the probability that measured concentrations of hazardous chemical substances will cause adverse effects in humans or the environment in the absence of remediation. The risk assessment will be used to determine if remediation site cleanup is necessary and also to rank sites for remedial action. Additionally, it will be used as a model for the risk assessment to be performed at the other DEW Line installations Bullen Point, Oliktok Point, Point Lonely, Barrow Point, Wainwright, and Point Lay and the Cape Lisburne radar installation. pg18. JMD