The ITRC TPH Risk Evaluation at Petroleum-Contaminated Sites guidance builds on long-standing and current research, and presents the current science for evaluating TPH risk at petroleum-contaminated sites.

This ITRC petroleum vapor intrusion (PVI) guidance document provides an 8-step process for the effective assessment and management of vapor intrusion at sites contaminated with petroleum hydrocarbons. The guidance presents a method of screening petroleum-contaminated sites for potential vapor intrusion and tools and strategies that offer the most efficient means of evaluating the vapor intrusion pathway at these sites.  Two checklists are also included as attachments to use in conjunction with the eight-step process to organize and document decisions; one for a single site and one for multiple sites.

Describes applicable approaches for evaluating the vapor intrusion pathway in six typical scenarios.

Evaluation of state practices for establishing and implementing closure criteria for bioventing, vapor extraction, and natural attenuation of petroleum hydrocarbons and chlorinated solvents.