The following LSPA practice tip was introduced at the June 2026 Membership Meeting, which was held via Zoom on Wednesday, June 10, 2026, from 3:45-5:00 PM.

Practice Tip  
In MassDEP’s Vapor Intrusion Guidance: Site Assessment, Mitigation, and Closure (Policy #WSC-16-435, Section 3.7), MassDEP recommends that for sampling to demonstrate that an active or passive mitigation system is no longer required to mitigate the vapor intrusion pathway, the vent pipe should be capped or the valve to the vent piping closed during the sampling event. For an active system, the vent or valve needs to be closed prior to sampling as well. Based on discussions with MassDEP, it is recommended that the vent/valve for an active system be closed at least seven days prior to sampling, consistent with the recommendation for deactivation of the system that is in the guidance.

A MassDEP BWSC Advisory Committee meeting was held on February 15, 2024. This webpage has slides and video from the meeting. Some highlights are below.

In this video, Brian Roden, BWSC Audits and Enforcement Coordinator, provides a summary of the 2024 MCP Amendments for AEPMMs addressing Vapor Intrusion.

LSPA's December 2021 Member Newsletter has been published! Table of Contents is listed below. Please log in to your account and visit Member Materials to view the full newsletter.

In this Issue....

• LSPA Blog
• MassDEP Audit Checklists Filed on LSPA Website
• 31 Out of 32 Risk Characterization-Related NOAFs Received NONs
• Review of FY 2020 NOAFs Related to NAPL
• Review of Vapor Intrusion Notice of Audit Findings, FY 2019 - FY 2020
• FY 2020 NOAFs Citing Response Action Performance Standard (RAPS)

MassDEP Finalizes Vapor Intrusion Guidance

As of Monday, October 17, 2016, MassDEP's Vapor Intrusion guidance document is final.  

LSPA Seeks Comments from Members on MassDEP's Draft Vapor Intrusion Guidance

MassDEP's draft guidance document on vapor intrusion has been published here. 

LSPA Submits Comments to MassDEP on Public Review Draft, Vapor Intrusion Guidance 

The LSPA sent a cover letter and matrix of comments to MassDEP on its October 2014 Public Review Draft of Vapor Intrusion Guidance, Policy #WSC-14-435.

LSPA Submits Comments to MassDEP on Public Review Draft, Vapor Intrusion Guidance 

The LSPA sent a cover letter and matrix of comments to MassDEP on its October 2014 Public Review Draft of Vapor Intrusion Guidance, Policy #WSC-14-435.

MassDEP's Vapor Intrusion Draft Guidance

The public review draft of the Vapor Intrusion Guidance is now posted here.  MassDEP will be holding a pre-comment stakeholder discussion of this draft on December 11, 2014, MassDEP, One Winter Street, Boston, 2nd floor, from 9:30 am to noon.  Written comments on this public review draft should be submitted to [email protected] by February 2, 2015.