The United States Air Force (Air Force) has prepared this Remedial Investigation/Feasibility Study (RI/FS) report as part of the Installation Restoration Program (IRP) to present results of RI/FS activities at six sites at the Wainwright radar installation. The IRP provides for investigating, quantifying, and remediating environmental contamination from past waste management activities at Air Force installations throughout the United States. The IRP is a four-phase program that approximates the remedial investigation (RI) and corrective action program used by the U.S. Environmental Protection Agency (EPA) for addressing contaminated sites that may pose a risk to human health or the environment. The Air Force initiated IRP activities at the Wainwright radar installation in 1980 in response to the Department of Defense's (DOD's) commitment to identify past waste disposal sites and eliminate hazards to public health. The initial Phase I assessment in 1980 conducted by the Air Force concluded that past waste management activities at the installation may have resulted in adverse environmental impacts at several sites (CH2M Hill 1981). Phase 1 activities included a detailed review of pertinent installation records from both government and civilian contractors, contracts with various government and private agencies for documents relevant to the program, and onsite visits during July and August 1981. The onsite visits included interviews with key station employees, ground tours of station facilities, and plane overflights.

This document contains the baseline human health risk assessment and the ecological risk assessment (ERA) for the Wainwright Distant Early Warning (DEW) Line radar installation. Six sites at the Wainwright 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 Wainwright Remedial Investigation/Feasibility Study (RI/FS) (U.S. Air Force 1996). The analytical data reported in the RI/FS form the basis for the human health and ecological risk assessments. The primary chemicals of concern (COCs) at the six sites are diesel and gasoline from past spills and/or leaks. The general location of the Wainwright radar installation is shown in Figure 1-1. The six 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 six sites investigated during the RI. 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, if so, to rank sites for remedial action.

This report presents the findings of Remedial Investigations and Feasibility Studies at sites located at the Point Lonely radar installation in northern Alaska. The sites were characterized based on sampling and analyses conducted during Remedial Investigation activities performed during August and September 1993. This report was prepared by lOF Technology Incorporated.

This Decision Document discusses the selection of no further action as the recommended action for four sites located at the Wainwright radar installation. The United States Air Force (Air Force) completed a Remedial Investigation/Feasibility Study and a Risk Assessment for the six sites located at the Wainwright installation (U.S. Air Force 1996a, b). Based on the findings of these activities, four sites are recommended for no further action. Each recommendation for no further action is based on one or more of the following criteria: (1) The findings of the Remedial Investigation/Feasibility Study demonstrate that chemical constituents are not present or occur at low concentrations; (2) There is no unacceptable risk to potential human or ecological receptors posed by chemical constituents detected at the site; and (3) The Air Force was unable to identify a source of suspected contamination during the Remedial Investigation/Feasibility Study process.

This document contains the baseline human health risk assessment and the ecological risk assessment (ERA) for the Wainwright Distant Early Warning (DEW) Line radar installation. Six sites at the Wainwright 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 Wainwright Remedial Investigation/Feasibility Study (RI/FS) (U.S. Air Force 1996). The analytical data reported in the RI/FS form the basis for the human health and ecological risk assessments. The primary chemicals of concern (COCs) at the six sites are diesel and gasoline from past spills and/or leaks. The general location of the Wainwright radar installation is shown in Figure 1-1. The six 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 six sites investigated during the RI. 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, if so, to rank sites for remedial action.