Posted on December 12, 2012 by Richard Sherman
The regulation of vapor intrusion is becoming more prevalent on both the federal and state level. In addition, although not strictly required as part of a Phase I ESA under ASTM 05 and AAI, many consultants take the position that this issue must be addressed at this first level of environmental due diligence.
One of the troubling issues at the state level is whether background concentrations should be taken into account in the establishment of indoor air quality standards. Many household products and building materials contain or release VOCs. However, not all states take background concentrations into account in the regulation of vapor intrusion.
EPA is expected to release its own vapor intrusion guidelines shortly. EPA appears to acknowledge the importance of background data in the process of formulating its guidelines. It remains to be seen whether such guidelines will impose stricter standards than those on the state level.