ABSTRACT
A vapor intrusion condition (VIC) occurs when these rapidly evaporating chemicals make their way into indoor air. New Jersey's comprehensive draft Vapor Intrusion Guidance was published in June 2005. Alaska's Evaluation of Vapor Intrusion Pathway at Contaminated Sites was published in September 2005. The Task Group's objective was to define good commercial and customary practice for conducting a VI assessment on a property parcel involved in a real estate transaction. In most cases, however, it is the real estate transaction responsibility to conduct a Tier 1 screening evaluation and possibly a Tier 2 screening evaluation before proceeding to a more costly and time consuming Tier 3 investigation or to Tier 4 mitigation. Vapor intrusion caused by releases of volatile chemicals from contaminated soil and/or groundwater is rapidly emerging as a serious concern with potentially significant impact on thousands of properties across the nation. A VIC occurs when these rapidly evaporating chemicals make their way into indoor air.
