Public Comment Form

Commenting open: November 18, 2021 09:35AM PT - December 20, 2021 11:59PM PT.

Draft Guidance for Evaluating Vapor Intrusion in Washington State (2021)


You are invited to review and comment on Ecology's Draft Guidance for Evaluating Vapor Intrusion in Washington State


The updated version incorporates numerous policy and technical changes that have occurred since the guidance was first issued in October 2009. It includes recommendations on:

  • Necessary data to collect;
  • Considerations for public involvement;
  • Options for implementing mitigation actions; and
  • Direction for completing the VI portion of the cleanup.



The guidance also includes information from four vapor intrusion Implementation Memos issued by Ecology over the past five years. Three of the memos have been updated and transformed into Appendices in the new guidance. The fourth, which consisted of a series of frequently asked questions, has been incorporated directly into the text of the document.


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