PCE Toxicity Value Review

On February 10, 2012, U.S. EPA published a final Health Assessment for Tetrachloroethylene (Perchloroethylene, or “Perc” or PCE) on the IRIS database (http://cfpub.epa.gov/ncea/iris/index.cfm?fuseaction=iris.showQuickView&substance_nmbr=0106). In the new Health Assessment, EPA provides revised toxicity values for oral exposures (a reference dose [RfD] for non-cancer and a cancer slope factor [CSF] for cancer risk) and for inhalation exposures [...]

Vapor Intrusion Discussion Summary

A summary of the February 9, 2012 discussion about revisions related to the Vapor Intrusion pathway is now available. These are notes from the discussion and not MassDEP’s interpretation. For those who participated in the conversation, please read the notes and comment on anything we may have missed or misinterpreted. For those who missed the meeting, this is [...]

Questions to Ponder for Workgroup Meeting

A list of topics and discussion items for the February 9, 2012 workgroup meeting has been posted on the MCP Reg Reform Blog.

Workgroup Meeting

During the development of the Vapor Intrusion Guidance, MassDEP staff and Workgroup members identified several potential changes to the MCP that could strengthen and streamline the notification, assessment, cleanup & closure of vapor intrusion sites.  A Workgroup meeting has been scheduled to discuss such potential regulation revisions: Thursday, February 9th, 1:00 – 3:00 pm @ [...]

Interim Final VI Guidance Available

The Massachusetts Department of Environmental Protection (MassDEP) is pleased to announce the publication of the “Interim Final Vapor Intrusion Guidance” (WSC#-11-435).  This guidance is provided to parties conducting response actions at disposal sites regulated under the Massachusetts Contingency Plan (MCP), 310 CMR 40.0000, to support the identification, assessment, and mitigation of vapor intrusion and compliance [...]

Next Meeting: 12/20/2011

MassDEP has scheduled a Vapor Intrusion Workgroup Meeting for Tuesday December 20th at 9:30 at 1 Winter Street, 2nd floor. The purpose of the meeting is to:  discuss the comments received on the December 2010 Draft Vapor intrusion Guidance and MassDEP’s responses; discuss the changes made to the December 2010 Draft and provide an overview [...]

July 28th Meeting Postponed

Greetings all! I’m writing to let you know that the July 28th Vapor Intrusion Workgroup meeting  is POSTPONED. I expect to reschedule for early September and will let you know a date as soon as possible. I would like to thank the DEP team for all the work that they did to prepare for this [...]

Comments on Draft Vapor Intrusion Guidance

MassDEP would like to thank you for submitting comments on the Draft Vapor Intrusion Guidance Document (December 2010).  We are currently organizing and reviewing the comments and we intend to compile a written summary of the comments and provide written responses which outlines how best to revise the guidance to address them. We will keep the [...]

VI Comments Are Available

Click on the links (the titles) to the previous 2 posts and scroll down to see comments (24 & counting) received by MassDEP on the draft VI guidance. Comments received via email (or US mail) are also being posted by DEP.

Presentation: VI Guidance Update

On Tuesday, January 11, 2011, Gerard Martin (MassDEP) was the guest speaker at the Licensed Site Professional Association (LSPA) monthly membership meeting. The presentation was titled, “Vapor Intrusion Guidance Update”, and was intended to provide a summary of what’s in the draft guidance document to facilitate the LSPA members’ review and comment. The PowerPoint slides [...]