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Draft Guidance for Evaluating Soil Vapor Intrusion in Washington State: Investigation and Remedial Action

Publication number Date Published
09-09-047April 2018
VIEW NOW Draft Guidance for Evaluating Soil Vapor Intrusion in Washington State: Investigation and Remedial Action (Number of pages: 109) (Publication Size: 3518KB)
Note: For more information see related web content below. You may print this publication by clicking on the PDF link above.

Table B-1: Link to revised (April 2015) Excel Spreadsheet for Vapor Intrusion Screening Levels
(1 pages) (395KB)

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Author(s) Pete Kmet
Description This draft document provides guidance on how to evaluate and respond to the vapor intrusion exposure pathway pursuant to the Model Toxics Control Act (MTCA) Cleanup Regulation, chapter 173-340 WAC.

In February 2016, this publication was revised with only one change from the October 2009 version: Table B-1 is outdated and should not be used. A link was provided to the 2015 spreadsheet.

In April 2018, links to the spreadsheet were changed to reflect Ecology's new website. You can access the Microsoft Excel spreadsheet containing updated screening levels through our webpage at:

You can also access the Excel spreadsheet through the Vapor Intrusion Overview webpage link below.
The mission of the Department of Ecology is to protect, preserve, and enhance Washington’s environment. To help us meet that goal, please consider the environment before you print or request a copy.

ADA Accessibility
The Department of Ecology is committed to providing people with disabilities access to information and services by meeting or exceeding the requirements of the Americans with Disabilities Act (ADA), Section 504 and 508 of the Rehabilitation Act, and Washington State Policy #188.
Visit Ecology’s website for more information.
Contact Policy & Technical Support Unit at 360-407-7170
Keywords screening levels, volatilization, vapor intrusion, mitigation, ground water
WEB PAGE Draft Vapor Intrusion Guidance Website

Implementation Memorandum No. 22: Vapor Intrusion (VI) Investigations and Short-Term Trichloroethene (TCE) Toxicity

Implementation Memorandum No. 21: Frequently Asked Questions (FAQs) Regarding Vapor Intrusion (VI) and Ecology's 2009 Draft VI Guidance

Implementation Memorandum No. 18: Petroleum Vapor Intrusion (VI): Updated Screening Levels, Cleanup Levels, and Assessing PVI Threats to Future Buildings

Implementation Memorandum No. 14: Updated Process for Initially Assessing the Potential for Petroleum Vapor Intrusion