Petroleum Vapor Intrusion

Produce a technical and regulatory guidance document and an Internet-based training course that describe a multiple-lines-of-evidence approach for evaluating petroleum vapor intrusion. The guidance document and training course will describe the differences between chlorinated and petroleum hydrocarbons, particularly the biodegradation of petroleum hydrocarbon vapors in the vadose zone. A comprehensive practical methodology for evaluating and mitigating sites for petroleum vapor intrusion will be developed.