February 2017 Vapor Intrusion Update Oakland County Bar Association
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Transcript of February 2017 Vapor Intrusion Update Oakland County Bar Association
![Page 1: February 2017 Vapor Intrusion Update Oakland County Bar Association](https://reader031.fdocuments.us/reader031/viewer/2022030401/58e5795e1a28abbf5d8b4e51/html5/thumbnails/1.jpg)
Vapor Intrusion (VI)
What is it and why should I care?
February 23, 2017
Farmington Hills, MI | Windsor, ON | Toronto, ON
Matthew Schroeder, PE and Jeffrey Bolin, CHMM
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What is Vapor Intrusion?
Vapor Intrusion (VI)Conceptual Site
Model
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Why Should We Care?
Text
10 years ago VI was not typically evaluated in RIs
Now VI concerns are often a driver for investigations and
remediations Included in ASTM Phase I standard
Recently added to Superfund scoring*
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Why Should We Care?
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Why Should We Care?
My site is closed!• We all heard MDEQ say “A deal is a deal”
but…
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Why Should We Care?
VI is regulated differently depending on location, and the guidance is changing rapidly
• USEPA guidance (2015)
• State guidance (Michigan, Ohio, Indiana, and Illinois all revised/issued guidance within the last year)
• California, Massachusetts incorporating new science quickly (maybe before proven?)
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Why Should We Care?
VI is regulated differently depending on location, and the guidance is changing rapidly
• Inconsistency across jurisdictions on what data is needed and what criteria apply
• Very conservative assumptions used to calculate screening levels
• Difficult to off-ramp once you exceed a screening level
Soil and groundwater?Sub-slab vapor?Indoor air?Models?Attenuation factors?OSHA criteria?
Criteria
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Michigan’s Draft Rules (VI)
• Issued in June 2016, revised in October 2016
• Tiered approach to VI assessments• Tier 1 – Initial Screening Levels• Tier 2 – Generic Criteria (incorporate soil type, depth to groundwater)• Tier 3A – Generic Criteria (Use Facility-Specific Land Use & Building Specifications)• Tier 3B – Site Specific Data
• Vapor Intrusion Calculator Tool (under development)
• Generally tries to avoid Indoor Air Testing
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Michigan’s Draft Rules (VI)
Note “Facility” Designation
Conceptual Site Model
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The Perfect Storm
TCE and Vapor Intrusion
• TCE short-term exposure limits
• Reliability of science doesn’t seem to matter
• Response actions required within days
• Michigan using Department of Health and Human Services to circumvent process and force evacuations until response actions conducted
Image from NBC
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How do I determine if VI is an issue at my site?
• Soil and groundwater data
• Subsurface soil gas
• Sub-slab soil gas
• Indoor air
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What’s on the horizon (or closer)?
• Overcoming sampling variability• Passive, long duration indoor air sampling• Large volume sub-slab sampling
• Isotope analyses to differentiate sources
• Handheld GC to identify sources to indoor air
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Takeaways
• Vapor intrusion assessment is changing rapidly, in the science, regulations, and public awareness
• More so than ever before, vapor intrusion is the driver for remediation/mitigation actions
• Vapor intrusion concerns can kill deals, cause evacuations, and lead to litigation liability
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Questions?