Subslab depressurization (or radon) systems are the most widely used technology for VI mitigation. Most of the respondents do not have written guidance on the installation of a subslab depressurization system, and very few have licensing programs for system installers. Greater than 67% of the respondents require post-mitigation confirmation sampling. Only 19% of the respondents specify how long the remediation systems should operate. A few respondents require off-gas testing of the mitigation systems, with very few requiring permits to operate the systems.
Click on each question to view results.88-91. Does your agency have written guidance for vapor intrusion mitigation systems that remediate:
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