HUD Requires Vapor Intrusion Screens

The U.S. Department of Housing and Urban Development (HUD) Office of Multifamily Housing has adopted Tier 1 vapor intrusion (VI) screens (the first of four tiers) under ASTM E 2600 as a mandatory component of Phase I environmental site assessments conducted under the agency's MAP (Multifamily Accelerated Processing) Guide. MAP is the procedure used by hundreds of MAP-approved lenders and HUD field offices throughout the country to process loan applications for Federal Housing Administration multifamily mortgage insurance. 

Under the revised policy, "The Phase I ESA must include an initial vapor (a.k.a. gas) intrusion screen to determine if there is a potential for vapors to occur in the subsurface below existing and/or proposed on-site structures from those hazardous substances, petroleum and petroleum products that consist of VOCs, SVOCs and inorganic volatile compounds."