The publication Guidance: Wisconsin Vapor Quick Look-Up Table Indoor Air Vapor Action Levels and Vapor Risk Screening Levels (RR-0136) is now updated and available on the DNR website. The U.S. EPA updated toxicity information for 1,1-dichloroethylene (1,1-DCE) in November 2024 by changing from U.S. EPA’s Integrated Risk Information System (IRIS) chronic inhalation reference concentration (RfC) to the Agency for Toxic Substances and Disease Registry (ATSDR) RfC for this chemical. The update decreased the VALs and VRSLs for 1,1-DCE.    

The purpose of this look-up table is to list volatile organic compounds frequently encountered at cleanup sites in Wisconsin. Consultants should compare vapor data for open sites to the updated table for potential additional actions. Vapor data for chemicals not listed on RR-0136 should accessed via the U.S. Environmental Protection Agency Vapor Intrusion Screening Level (VISL) Calculator; instructions on using VISL are included in RR-0136.    

Additional documents and guidance from the Remediation and Redevelopment Program may be found using the search tools available on the publications and forms webpage. 

Questions regarding this document may be submitted to Jennifer Borski at Jennifer.Borski@wisconsin.gov.