Tag Archives: TCE

About those calls from MassDEP…

TCE_moleculesLast month, we wrote about MassDEP’s trichloroethylene (TCE) site reevaluation initiative. MassDEP has begun the process of screening sites previously closed under the MCP to look for sites where TCE might exceed the new groundwater concentration standard of 5 μg/L.   At yesterday’s meeting of the Waste Site Cleanup Advisory Committee, MassDEP provided an update on this initiative.

MassDEP has not yet begun contacting owners of closed sites.  … More

If MassDEP calls…

TCE_moleculesAt a recent meeting of the Massachusetts Department of Environmental Protection’s Waste Site Cleanup Advisory Committee, MassDEP announced that it will soon begin the process of contacting owners of previously closed sites where the available data suggest that trichloroethylene (TCE) levels may be problematic. Back in June of 2014, MassDEP promulgated rules updating its standards to reflect the most recent USEPA toxicity values. MassDEP updated its imminent hazard standards for TCE exposure in indoor air and simultaneously updated its MCP Method 1 soil and groundwater standards and reportable concentrations to reflect the new values.… More

MassDEP Tightens TCE Indoor Air Regulation: The $64,000 Question? What About Closed Sites?

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