sample techniques for evaluating materials and structures...
TRANSCRIPT
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Sample techniques for evaluating materials and structures for potential
VOC contamination
Gavin Armstrong [email protected]
Ohio EPA Division of Environmental Response and Revitalization
Site Investigation Field Unit
Ohio Brownfield Conference 2014
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Conceptual Site Models for the Vapor Intrusion Pathway are vital to the overall successful evaluation
of both real and potential contaminant exposures.
We could (and probably should) talk about this the rest of the afternoon…
CSM Examples
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By definition; Vapor intrusion is defined as vapor-phase migration of volatile organic compounds or volatile inorganic compounds into occupied buildings from underlying contaminated groundwater or soil. (http://www.epa.gov/ada/gw/vapor.html)
Conceptual Site Models demonstrate this….
BUT WHAT IF?
The vapor-phase source of contamination is from the building and/or materials in the building itself…
?
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Obvious signs of stained flooring/concrete
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Purpose for evaluating the building itself
Approx. 80,000 ft2 manufacturing facility
Various manufacturing activities from before WWII to now
Solvent usage for decades – one of the largest users of TCE in the country
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Primary area used for manufacturing
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Two additional side rooms
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2 SVE Systems installed in the building
Main manufacturing room
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Secondary/side finishing room
Both systems positioned in areas of known solvent use.
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Sub-Slab Vapor Ports 22 Locations throughout building
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Indoor Air Sample Locations 7 Indoor + 1 Ambient
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Concrete Chip & Vapor Dome Screening Locations 16 Locations
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Concrete Chip & Vapor Dome Sample Screening Process
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Flux Chambers
Look Familiar? Similar Principles
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~ Conceptual Sample Pattern ~ Qualitative & Quantitative Concrete Evaluation
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7 ~ 8 hour stabilization period Direct read instrumentation
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Thermal temp gun used to record temp of concrete
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Sampled concrete chips Concrete weighed to approx. 100g and placed into 4oz. septa top jars Vapor Domes sampled into Tedlar Bags for real-time analysis in mobile lab
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Additional building materials sampled
Insulation
Drilling concrete dust
Accumulated “crud” under
floor tile and near machinery
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Initial results of Concrete Evaluation/Analysis
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CONCLUSIONS * Additional Fixed-based Lab Results Needed * Fixed-base v. Mobile Lab v. Hand-held Screening Comparison * Additional Evaluation of Concrete Chips @ Various Temps * Sample Concrete/Material with a “control” Compound