EPA Study May Boost Case For Strict 'Interior' Vapor Sampling Rules

A newly-released EPA study shows that air sampling for toxic vapor risks near a building's foundation may inaccurately represent the vapor intrusion risk to indoor air, a result that raises doubts about less-invasive monitoring techniques and that the agency says will be incorporated into future guidance documents. Completed by EPA contractors last month, the study will inform forthcoming EPA guidelines detailing vapor intrusion monitoring requirements and could even be applied retroactively to completed or ongoing site assessments if they rely...