Please note that this blog is no longer active.

The work to update MassDEP’s Indoor Air Guidance is complete.  MassDEP’s current information is available online at www.Mass.Gov/dep.

These pages are considered “archived” and are no longer updated or monitored.

April 30, 2015 – Vapor Intrusion Guidance Development Meeting

There was a meeting on the draft Vapor Intrusion Guidance on April 30, 2015, from 9:30 am to 11:00 at MassDEP, One Winter Street, Boston, 2nd floor conference rooms A and B.  Draft guidance document and public comments.

The recording of the VI workgroup meeting can be seen at

New USEPA Guidance on TCE

The new (August 27, 2014) document is titled: “Compilation of Information Relating to Early/Interim Actions at Superfund Sites and the TCE IRIS Assessment.”  USEPA describes the document as follows:  “The compilation was prepared in response to requests from U.S. EPA Regional Offices.   It provides information regarding existing EPA guidance on early or interim actions at Superfund sites.   It also provides current information about the toxicity of TCE.  The information referenced in this document may be used to support Superfund decision making at sites with actual or potential inhalation exposures to TCE.

download:  TCE compilation final.pdf (1 MB, PDF file)

Updated TCE Documents

MassDEP has recently made minor revisions to two TCE-related documents (last updated in March, 2014):

  1. TCE Toxicity Information:  Implications for Chronic and Shorter-Term Exposure – Fact Sheet (August 15, 2014)
  2. EPA Trichloroethylene Toxicity Values and ORS Recommendations Regarding Remediation Targets & Timeframes to Address Potential Developmental Risks (August 15, 2014)

New EPA Region IX TCE Guidance

Now available:

EPA Region 9 Response Action Levels and Recommendations to Address Near-Term Inhalation Exposures to TCE in Air from Subsurface Vapor Intrusion

download:  Region IX July 2014.pdf (6.3 MB PDF document)

EPA Comment Period Extended to 6/24

Draft Final Vapor Intrusion Guidance Documents Available for Public Input

EPA is affording the public with an opportunity to provide input on its draft final vapor intrusion guidance documents (see links below). The public may provide input by June 24, 2013 at (EPA-HQ-RCRA-2002-0033).



Revised TCE Status Update

MassDEP has recently revised the TCE Status Update (originally published in January, 2013):

TCE Status Update
TCE Status Update REVISED 4/18/2013 (PDF):   Revised TCE Fact Sheet – 04-18-2013
TCE Status Update REVISED 4/18/2013 (MS Word): Revised TCE Fact Sheet – 04-18-2013
This update provides a summary of the available toxicity information for TCE, the status of the MassDEP review of this information, and an appropriate approach to assessing disposal sites during this review period.