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, a HUD Phase I ESA must include an initial vapor 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.
HUD is one of two Federal lending agencies that that prescribe additional mandatory requirements to a Phase I ESA. The Small Business Administration also has additional enviornmental review requirements for participation in its lending programs.
SBA Environmental Review / RSRA / Phase I Environmental Site Assessment Requirements
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