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- Manuals
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- Languages
- EN
- Last added
- 2023-10-26
Featured DEP manuals
DEP Vapor Intrusion Guidance FAQs Version 3.0
This document provides answers to common questions about vapor intrusion (VI) evaluation under DEP guidance. It covers topics such as crawl space assessment, mercury screening, modeling options, preferential pathways, and future site use. Guidance is based on Technical Guidance Manual (TGM) revisions and includes updates through Version 3.0 (April 2023). Remediators are advised to consult DEP project managers for site-specific uncertainties.
Covers: General · Effect of New Guidance on In-Process Sites · Future Use of Site · Modeling · Off-Site Properties · Preferential Pathways
Latest DEP manuals
DEP Vapor Intrusion Guidance FAQs Version 3.0
User Manual 19 pages · 192 KB · ENFrequently asked questions about vapor intrusion evaluation under DEP guidance, including crawl spaces, mercury, modeling, and preferential pathways.
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Questions answered in DEP manuals
What are the VI evaluation options when there is a crawl space present?
Crawl space sample data should usually be screened against indoor air screening values. If the crawl space is below a concrete slab and the slab is comparable to a slab-on-grade building with no significant openings, then samples can be compared to sub-slab screening values.
Should a building with intermittent access such as a garage be evaluated for VI?
The vapor intrusion guidance applies to "inhabited buildings." A structure used exclusively for storage is not generally regarded as an "inhabited building." The remediator will need to decide whether there is sufficient occupancy to pose a potential VI risk.