EPA Region 8: TCE inhalation toxicity values and risk based indoor air concentrations
EPA Region 8 serves Colorado, Montana, North Dakota, South Dakota, Utah, and Wyoming. In January of 2005, they published these guidelines (1.5MB PDF):
The purpose of this document is to provide a synopsis of trichloroethylene (TCE) inhalation toxicity values and provide the corresponding risk-based indoor air concentrations for use in vapor intrusion assessment. Table 1 summarizes the toxicity values and risk-based concentrations. Figure 1 provides a graphic comparison of the ranges of concentrations corresponding to each of the toxicity values.
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