Lutes, C.C. “Future Testing: Combining External Soil Gas Concentrations with Indoor ITS to Form a Partial Surrogate to Minimize Indoor Air Sampling” Presented at EPA Workshop on: Indicators, Tracers and Surrogates (ITS) for Chlorinated Vapor Intrusion (CVI) – Pursuing Additional Observations at AEHS East Coast Conference, October 16, 2018.
2. Example Application Strategy – Combining
External (Soil‐gas Concentration) With Indoor ITS
Measurements to Target Sampling
• Objective – can we target sampling efforts to minimize the occupant
disturbance concerns of subslab/indoor sampling?
• Background on the problem – lots of evidence that VI impacts are spotty
across a plume
• Understanding the predictive value of shallow and deep external soil gas in
various release/transport scenarios – using the CSM
• Supplementing a shallow soil gas concentration map with an understanding
of shallow soil types and building characteristics
• Using surrogates and building science to target sampling and validate
inferences
13. Conclusion ‐ External Sampling Plus ITS
• This particular application is an attractive concept
• Needs much more testing, and the sooner the better! Your
observations could add significantly to our understanding