Guidance for Superfund (RAGS) Part F (Supplemental Guidance for Inhalation Risk

The attached table summarizes exposure factors which may be used as default values in human health risk assessments for California hazardous waste sites and permitted facilities. The recommended values were obtained primarily from USEPA and Cal-EPA DTSC guidance documents, and references for each of the exposure factors are provided. The values shown should generally be used to calculate reasonable maximum exposure (RME) estimates for residential, industrial, and construction worker receptors. Site-specific data may warrant deviation from these values. For any cases in which site specific alternate values are used, appropriate justification and documentation should be included in the risk assessment report. While inhalation rates are provided in the attached table, US EPA’s Risk Assessmen