Vapor intrusion

ITRC’s Vapor Intrusion Mitigation Technical Resources Now Available

A new, comprehensive series of technical resources covering a variety of vapor intrusion mitigation topics is now available from the Interstate Technology Regulatory Council (ITRC). The resources are included on the Remediation and Redevelopment (RR) Program’s web page of Vapor Intrusion Resources for Environmental Professionals.

ITRC’s technical resources cover a range of topics specific to vapor intrusion mitigation, including:

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Issues & Trends Webinar Dec. 16 – Vapor Intrusion: Screening and Mitigation Decisions, Scope and Timing

The Remediation and Redevelopment Program reminds you that it will present the next Issues & Trends webinar on Wednesday, Dec. 16, 2020, from noon to 1:00 p.m.

The scheduled presentation is Vapor Intrusion: Screening and Mitigation Decisions, Scope and Timing. Speakers will present information from investigations in Wisconsin and elsewhere related to the variability of vapor concentrations, and the factors which control variability.

To sign up for the webinar, visit the RR Program’s Conferences and Training webpage.

Recordings of previous Issues & Trends webinars, including the July 2020 presentation: Vapor Intrusion – New Preferential Pathways, may be found in the RR Program’s Training Library.

Vapor Mitigation System Inspection Log Available

In October 2020, the Remediation and Redevelopment (RR) Program created a Vapor Mitigation System Inspection Log, Form 4400-321. The new form explains the functionality of the vapor mitigation system components and allows installers to include site-specific photos of the system components (e.g., drop points, fans). The form is also designed to assist property owners as they take over responsibility for system inspections after case closure, helping to ensure the long-term care and maintenance of the system.

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Reminder: Issues & Trends Webinar on December 16 – Vapor Intrusion: Screening and Mitigation Decisions, Scope and Timing

The Remediation and Redevelopment Program reminds you that the next webinar in the Issues & Trends series will take place on Wednesday, December 16, from 12:00 p.m. to 1:00 p.m.

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Consultants’ Day 2020 Update: Keynote Speaker; Mediasite Option; Registration Opens Soon

Plans for Consultants’ Day 2020 are in full swing, with an exciting keynote speaker identified for both events and a distance-learning option in place for the May conference.

The first of two Consultants’ Day conferences is scheduled for Wednesday, April 29 in Stevens Point at the Holiday Inn Convention Center. The second event will take place on Wednesday, May 13 in Pewaukee at the Ingleside (formerly the Country Springs). The Remediation and Redevelopment (RR) Program anticipates registration opening soon for both events. That announcement will be promptly shared via the RR Report and shared on the RR Program’s Conference & Training web page.

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Vapor Intrusion: DOD Utility Study, Resources in Spanish and Concerns with TCE

DOD Utility Study

The DNR recently learned about a recent study on vapor migration within utilities. The study, funded by the Department of Defense Environmental Security Technology Certification Program (ESTCP), is titled Sewers and Utility Tunnels as Preferential Pathways for Volatile Organic Compound Migration into Buildings; Risk Factors and Investigation Protocol.

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RR Program Web and IT Updates

The Remediation and Redevelopment (RR) Program has created a new web page for contaminated soil and sediment, and recently completed additional webpage updates.

The new contaminated soil and sediment web page contains guidance and instructions on the soil RCL calculator and information about alternative soil assessments, soil and materials management under Wis. Admin. Code ch. NR 718, historic fill exemptions, contaminated sediments, PCBs in soil, smear zone contamination, and biodegradation as a remedial action.

If you already have Resources for Environmental Professionals bookmarked, a link to the new webpage can be found in the “Related Links” section, as well as at the top of that page for a limited time.

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New Vapor Intrusion Guidance Featured on April Issues & Trends Conference Call

The DNR’s Remediation and Redevelopment Program brings back the Issues & Trends series at noon on April 4 with a conference call regarding the recently published guidance on vapor intrusion.

The guidance, Addressing Vapor Intrusion at Remediation & Redevelopment Sites in Wisconsin, RR-800, was revised in January 2018. During the next Issues & Trends event, vapor intrusion team leader Alyssa Sellwood will walk participants through key updates to RR-800 to familiarize callers with the new document. Alyssa will also discuss several topics related to vapor mitigation in greater detail, including mitigation in new construction and the importance of performance verification.

To join the conference call:

  • Dial 1-855-947-8255
  • Enter passcode 6612 745#
  • On April 4, 2018
  • At 12:00 p.m. CST

There is no cost to participate and no pre-registration is required.

Questions or comments in advance can be sent to DNRRRComments@wisconsin.gov. Handouts or any other materials related to the April 4 conference call will be made available in advance at the RR Program’s Conference and Training web page.

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.