This document provides technical information to regulatory personnel from the U.S. Environmental Protection Agency (EPA) and state, tribal, and local agencies for investigating and assessing petroleum vapor intrusion (PVI) at sites where petroleum hydrocarbons (PHCs) have been released from underground storage tanks (USTs). This document is comprised of two parts: Recommendations, which provides a description of EPA’s recommended approach for addressing PVI, and Supporting Technical Information, which provides detailed technical information supporting the recommendations.

• Technical Guide for Addressing Petroleum Vapor Intrusion at Leaking Underground Storage Tank Sites (PDF)(129 pp, 3 MB, June 2015, EPA 510-R-15-001)