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DRAFT Vapor Intrusion (VI) Investigations and Short-term Trichloroethene (TCE) Toxicity (Implementation Memo No. 22)

Publication number Date Published
18-09-047November 2018
VIEW NOW: DRAFT Vapor Intrusion (VI) Investigations and Short-term Trichloroethene (TCE) Toxicity (Implementation Memo No. 22) (Number of pages: 33) (Publication Size: 249KB)
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Author(s) Ed Jones (Hazardous Waste and Toxics Reduction) and Mark Gordon (Toxics Cleanup Program)
Description This memo applies to any cleanup site where trichloroethene (TCE) is a subsurface contaminant of concern and a vapor intrusion (VI) pathway is being evaluated. Trichloroethene is a chemical also known as trichloroethylene or TCE.

In 2009, the Washington State Department of Ecology published Draft Vapor Intrusion Guidance, publication no. 09-09-047. This memo supplements the draft 2009 VI guidance. While much of the draft guidance is applicable to sites where TCE VI is a possibility, this memo addresses several issues that were not previously considered. This includes: 1) response speed, 2) focus on women of childbearing age, and 3) type of public outreach.

The memo also provides Method B and C indoor air action levels, as well as soil gas and groundwater screening levels to help evaluate whether there is the potential for short-term TCE risks to occur.

REVISION NOTE: This memo was published as a draft for public comment on November 21, 2018. Comments were accepted on the draft through Monday, January 7, 2019.
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Contact Policy & Technical Support Unit, Toxics Cleanup Program at 360-407-7170
Keywords air contamination, trichloroethylene (TCE), Vapor Intrusion (VI), volatile organic compounds (VOC), soil contamination, groundwater contamination, indoor air quality, Subsurface vapor, Vapro Intrusion pathways, trichloroethene (TCE)
WEB PAGE Vapor Intrusion

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

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

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

Updated Process for Initially Assessing the Potential for Petroleum Vapor Intrusion (Implementation Memorandum #14)

Model Toxics Control Act Regulation and Statute: MTCA Cleanup Regulation Chapter 173-340 WAC, Model Toxics Control Act Chapter 70.105D RCW, Uniform Environmental Covenants Act Chapter 64.70 RCW