Quantitative leak testing for soil gas wells using a commercially available helium tracer shroud

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In this paper we present design considerations, use, procedures and validation data for a commercially available Helium tracer soil gas sampling shroud that can be rented from an internationally accredited environmental testing laboratory with soil gas measurement capabilities. Soil Gas Sampling using the Helium shroud technique described in Appendix C, page 57, CA DTSC Soil Gas Advisory Document (March 2010) is employed to ensure valid soil gas samples are collected. Sampling soil gas wells under Helium enriched atmosphere provides a quantifiable way to ensure there has been no breakthrough of air down the probe/well or through leaks in the sampling train. Well and sample train integrity is confirmed by field and laboratory analysis of purge and sample streams for the Helium tracer.

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