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July 2015 Soil Gas Advisory - What's New?

Waterstone will conduct your subsurface investigation in accordance with the most current regulatory guidances. For active soil gas surveys, this means using the latest and greatest Advisory on Active Soil Gas Investigations published in July 2015. What do these changes mean for you? Because the agencies have chosen to eliminate purge test sampling, at least two fewer unnecessary samples will need to be collected and analyzed during each investigation. Also, decommissioning procedures for soil gas wells were modified to emulate the California Well Standards (Bulletin 74-90) requirements, reducing further a potential conduit for contamination migration. Budgetary costs for these and other Advisory modifications should be evaluated when performing soil gas surveys.

"Jointly revised by DTSC, Los Angeles Regional Water Quality Control Board (LARWQCB), and San Francisco Regional Water Quality Control Board, this updated Advisory provides technically consistent approaches for collecting and analyzing soil gas samples. Data obtained from soil gas investigations can be used to identify the spatial distribution of volatile contamination at a site and assist in the evaluation of vapor intrusion."

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