Remedial investigations (RI) conducted on hazardous waste sites should determine (1) the nature and extent of contamination that exists and (2) the extent to which some level of cleanup must be performed to be protective of human health and the environment. The typical RI includes the collection and chemical analyses of site media, including surface and subsurface soils, surface and groundwater, sediment, and biota (plant and animal species). In some instances, air monitoring may be conducted to determine airborne concentrations of contaminants. An integral component of the RI is the development of the Human Health Baseline Risk Assessment. The risk...

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