Vapor intrusion

Updated Vapor Intrusion Guidance Now Available

Following two years of effort and collaboration with external partners to update guidance on response actions for vapor intrusion, the Remediation and Redevelopment Program is pleased to announce that the document, Addressing Vapor Intrusion at Remediation and Redevelopment Sites in Wisconsin (PUB-RR-800), is available to the public. (To see the DNR’s responses to comments received during the public comment period for the draft, please visit click this link.)

Page one of updated publication

Addressing Vapor Intrusion at Remediation and Redevelopment Sites in Wisconsin, DNR publication RR-800

The guidance relates to the assessment, remediation and mitigation of the vapor intrusion pathway at contaminated sites in Wisconsin, for both chlorinated and petroleum substances.

Among numerous updates, the new guidance incorporates the changes made to the Wisconsin Administrative Code ch. NR 700 in 2013. It also includes information found in the EPA’s 2015 vapor intrusion guidance documents, and it provides additional details on mitigation, including principles found in the American Association of Radon Scientists and Technologists (AARST) 2017 national standard on vapor mitigation, SCM-SF-2017).

The RR-800 guidance was most recently updated in 2010.

Questions or comments about the new guidance can be addressed to Alyssa Sellwood.

Open House “Q & A” on New Vapor Intrusion Guidance

The Remediation and Redevelopment Program will host a two-hour “Q & A” regarding the agency’s new guidance on vapor intrusion. The open house event will take place on Tuesday, August 29, in Madison, and via teleconference at the same time.

The guidance – RR-800 – is currently available for written public comment through the DNR’s “proposed program guidance” web page; comment on the document will be accepted through September 8, 2017.

Subjects discussed during the “Q & A” session will not take the place of written comments on the document. Rather, the opportunity is meant to help further clarify the material for those who may have questions about the content, with hope of alleviating potential erroneous comments.

Details of the vapor intrusion “Q & A” open house are:

  • Date: Tuesday, August 29
  • Time: 9:00 – 11:00 CST
  • Location: DNR Central Office, Room G-09, 101 S. Webster St., Madison, WI 53707
  • Conference Call Number: 1-855-947-8255, Passcode: 6612745#

Vapor intrusion team leader Alyssa Sellwood and Policy and Technical Resources Section Chief Judy Fassbender will be available to answer questions and clarify issues for participants.

If you plan to attend in person, please notify Alyssa Sellwood by the close of the business day on Monday, August 28, so that building security can be prepared for your arrival.

Issues & Trends Conference Call Scheduled for September 6

Alyssa Sellwood, the Remediation and Redevelopment Program’s vapor intrusion and dry-cleaning team leader, will present our Issues & Trends conference call in September. Alyssa will discuss vapor intrusion sampling, including a discussion of action triggers, mitigation and long-term monitoring.  

Date: Wednesday, September 6
Time: 12:00 p.m. – 1:00 p.m.
Phone number: 1-855-947-8255
Passcode: 6612745#

The conference call will be recorded and available for playback via the Program’s training library for those who are unable to participate during the above time.

No pre-registration is required.  

 

Updated Vapor Intrusion Guidance – RR-800 Public Input Opportunities

The RR Program seeks your input on a significantly revised document titled, RR-800, Addressing Vapor Intrusion at Remediation & Redevelopment Sites in Wisconsin. The revisions to RR-800 include: updates from ITRC’s and USPEA’s vapor guidance; additional details on required deliverables; expectations for outreach; clarification on preemptive mitigation; and a significantly expanded discussion on vapor mitigation (design options, performance verifications, long-term operation and maintenance, and continuing obligations).

The document can be reviewed at http://dnr.wi.gov/news/input/guidance.html and comments can be submitted through September 8, 2017 to the Vapor Intrusion Team Leader, Alyssa Sellwood at Alyssa.Sellwood@wisconsin.gov. In addition, the RR Program will host a question and answer session on Tuesday, August 29th.  Mark your calendars; more details to come.

Issues & Trends: A Preview and Discussion of DNR’s Vapor Intrusion Guidance

Alyssa Sellwood, a Hydrogeologist with the Remediation and Redevelopment Program and the leader of the dry cleaning and vapor intrusion teams, will present the next Issues & Trends training event on Wednesday, August 9, at noon. No pre-registration is required.

Sellwood’s presentation will be an overview of forthcoming additions and modifications to the RR Program’s existing guidance on vapor intrusion – RR 800 Addressing Vapor Intrusion at Remediation and Redevelopment Sites in Wisconsin. We originally published the guidance in 2010, but revisions are necessary as knowledge and understanding of vapor intrusion has grown. The guidance is being readied for public comment and includes such updates as commissioning and inspecting vapor mitigation systems, mitigating vapor risk in new construction, and evaluating and addressing potential vapor risk in large commercial and industrial buildings.

The training session details are:

  • Date: August 9, 2017
  • Time: 12:00 – 1:00 p.m.
  • Join by phone: 1-855-947-8255, passcode 6612745#
  • Questions in advance can be sent to DNRRRComments@wisconsin.gov

New Tools Available for Vapor Intrusion Professionals

The RR Program recently added four, new online tools to our vapor intrusion (VI) prevention web page to assist environmental professionals as they prepare VI assessments or plan for outreach on a site impacted by vapor intrusion.

Three of these tools are located on the Vapor Intrusion for Environmental Professionals website, under the “community outreach” tab, and include:

  1. Vapor Intrusion 101 video uses a hand drawn animation technique to introduce the concept of vapor intrusion. It is intended for use in conjunction with factsheets and personal communication when talking with a property owner who is unfamiliar with vapor intrusion.
  2. The Responsible Neighbor – A Vapor Intrusion Story video shares an important message for consultants, attorneys, and RPs on how good communication with neighbors benefits everyone involved with an environmental cleanup.
  3. RR-067: Vapor Intrusion Investigation – Information Sheet for Neighbors can be given to an off-site property owner when access is needed to investigate vapor intrusion on their property. This factsheet provides an introduction to environmental investigations, identifies the parties involved, and clarifies who the property owner can contact with questions.

The fourth new tool is on the same web page, under the “screening levels” tab:

  1. Quick Look-Up Table for VALs and VRSL Wisconsin’s Vapor Action Levels (VALs) and Vapor Risk Screening Levels (VRSLs) have changed over time due to updates to EPA’s risk calculations and changes in default attenuation factors. History of Changes to VALs, VRSLs and Attenuation Factors for Common VOCs is a quick reference to the historical screening levels and the dates when changes occurred, and is intended to clarify the basis for past decisions at a site.

Questions about these new tools or other issues related to vapor intrusion can be directed to Alyssa Sellwood, the RR Program’s VI specialist.