Now Available – Guidance: Wisconsin Vapor Quick Look-Up Table and History of Changes to Vapor Action Levels (VAL), Vapor Risk Screening Levels (VRSL) and Attenuation Factors (AF) for Common Volatile Organic Compounds (VOC) in Wisconsin

The publications Guidance: Wisconsin Vapor Quick Look-Up Table (RR-0136) and Guidance: History of Changes to Vapor Action Levels, Vapor Risk Screening Levels and Attenuation Factors for Common Volatile Organic Compounds (VOC) in Wisconsin (RR-0137) are now posted and available online.

The Guidance: Wisconsin Vapor Quick Look-Up Table (RR-0136) includes indoor air vapor action levels (VALs) and vapor risk screening levels (VRSLs) for volatile organic compounds frequently encountered at remediation sites. Important updates to note with the latest version include:

  • Inhalation toxicity data (VALs and VSRLs) for trans-1,2-dichloroethylene (trans-1,2-DCE)
  • Highlighted VALs and sub-slab VSRLs for tetrachloroethylene (PCE) and trichloroethylene (TCE)
  • Revised instructions to reflect updates to the U.S. EPA Vapor Intrusion Screening Level (VISL) calculator since 2017

The Guidance: History of Changes to Vapor Action Levels, Vapor Risk Screening Levels and Attenuation Factors for Common Volatile Organic Compound helps users understand the basis for past decisions at sites and is provided as a reference of historical values.

Both updated documents and additional information regarding vapor intrusion are available on the Vapor Intrusion for Environmental Professionals web page.

Site-specific questions regarding vapor intrusion should be directed to the assigned DNR project manager. General questions can be directed to the contacts listed on the DNR’s Vapor Intrusion Resources for Environmental Professionals web page. Additional documents and guidance from the Remediation and Redevelopment Program may be found using the search tools available on the publications and forms webpage.

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