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January 18, 2018 - [SRRA]: Updated Vapor Intrusion Technical Guidance

From:; on behalf of; SRRA <>
Date & Time: 1/18/2018 3:37:00 PM
Subject [SRRA]: Updated Vapor Intrusion Technical Guidance

[SRRA]: Updated Vapor Intrusion Technical Guidance

The Department announces the availability of the revised Vapor Intrusion Technical Guidance (Version 4.1, January 2018).

The Vapor Intrusion Technical Guidance has been updated from version 4.0 to version 4.1. Revisions to this technical guidance document include, but are not limited to, adding language regarding Indeterminate Vapor Intrusion Pathway status, clarifying the establishment of a classification exception area in a Vapor Intrusion investigation, defining near slab and exterior soil gas samples, as well detailing the step out sampling for vapor concern and immediate environmental concern cases.

This updated technical guidance document and corresponding change log can be found on the SRP Guidance Library (

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