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3.2 Remedial Action Objectives <br /> RAOs describe what the remedial alternatives need to achieve to protect human health and the <br /> environment. RAOs specify the contaminants and media of interest, exposure pathways, and <br /> receptors of concern and are based on the remediation goals. Remediation goals are developed <br /> based on chemical-specific applicable or relevant and appropriate requirements (ARARs), when <br /> available, and site-specific risk-related factors. <br /> The following RAOs have been developed for soil and sediment at Site 47: <br /> • Minimize exposure of future industrial/commercial occupants to arsenic and PAHs in <br /> shallow soil (0 to 2 feet bgs) at concentrations exceeding the remediation goals (Table <br /> 5); <br /> • Minimize exposure of ecological receptors to arsenic in shallow soil (0 to 2 feet bgs) <br /> at concentrations exceeding the remediation goal (Table 5); and <br /> • Minimize exposure of ecological receptors to total DDT in surface sediment(top 1.5 feet <br /> bgs)within and soil (top 3 feet bgs) adjacent to the southern drainage channel at <br /> concentrations exceeding the remediation goal (Table 5). <br /> The remediation goals for this Site 47 RAP are presented in Table 5. The remediation goals are <br /> consistent with the risk-based SLs described in Section 3.1; however, the remediation goal for <br /> arsenic in soil is the BTV because the BTV exceeds the human health risk-based SL. <br /> Site 47 RAP for Soil 10 October 2023 <br />