For the purpose of making Current Human Exposure under Control Environmental Indicator (EI) determinations with respect to vapor intrusion, EPA generally recommends the use of 10-5 levels for carcinogens (incremental individual lifetime cancer risk), and a Hazard Quotient (HQ) of 1 for non-cancer risks. (For occupational settings, see question #465).
For more information, see http://www.epa.gov/epawaste/hazard/correctiveaction/eis/index.htm.
What are the applicable criteria to use in determining whether the human health environmental indicator has been met for the vapor intrusion pathway?
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