Innovation in Environmental Solutions

9 Human Health Risk Assessment Mitigating Petroleum Vapor Intrusion in Rocky Mountain Community Petroleum Vapors Threaten Residential Community Near Refinery Gasoline was measured at increasing thickness in several monitoring locations within a residential community adjacent to a refinery in the Rocky Mountains. It was determined that the source of the gasoline was associated with the failed floor of a massive storage tank. In response, the state regulatory agency and its technical expert requested that our client expedite the investigation of the vapor intrusion pathway and proceed with mitigation measures as needed to ensure protection of the nearby residential community. Project at a Glance • Petroleum vapors threaten Rocky Mountain residential community • Failed floor of storage tank blamed • Team exampled soil vapor analytics to narrow list of volatile constituents • Found that background sources complicated evaluation of the vapor intrusion pathway in nearby residences. • Found that source of constituents within 11 residences were attributed to background sources and not from client refinery site. • Innovative approach eliminated costly mitigation and investigation