Last week, MassDEP released new guidance on how it is assessing exposures to TCE in light of EPA new assessment of TCE risks released in September 2011. The biggest issue is that concerns about fetal exposure have caused MassDEP to tighten the imminent hazard threshold for indoor air exposures to 2 ug/m3. That’s an order of magnitude reduction from the prior standard of 20 ug/m3.
MassDEP has apparently thus far taken the position that it is not planning on reopening closed sites based on the new IH criterion. … More