A proposed rule to add vapor intrusion to the Environmental Protection Agency's hazard-ranking system could come as early as December, lawyer Christopher Roe said in a webinar. "The big issue that remains is whether [the EPA] will reconsider its limitation of the use of [petroleum vapor intrusion] guidance and its practical approach to petroleum contamination at [underground storage tank] sites, as opposed to refineries and other locations with significant petroleum in the subsurface," Roe said.

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