Vapor Intrusion Survey

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Remediation

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.

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88-91. Does your agency have written guidance for vapor intrusion mitigation systems that remediate:

88. Radon
89. Methane
90. Volatile organic compounds
91. Petroleum-related hydrocarbons


92. Does your agency generally require subslab depressurization systems (aka 'radon' systems) to mitigate vapor intrusion?

93-99. Does your agency have experience with other vapor intrusion mitigation systems?

93. Passive sealing
94. Positive house pressure
95. Subslab pressurization systems
96. Indoor air treatment
97. Measures to increase natural ventilation
98. Heating recovery ventilation technology
99. Adjustments to existing HVAC systems


100. Please list any other abatement strategies.

101. Does your state/region have any special licensing/registration requirements for contractors that install vapor mitigation systems?

102. Does your agency review design plans for vapor mitigation systems?

103-105. Does your agency require:

103. Off-gas testing
104. Permitting
105. Treatment of vapor mitigation system off-gas


106. Does your agency require post-mitigation testing to confirm that mitigation systems are working?

107. Does your state have experience with or require institutional controls (e.g., deed notices) for vapor intrusion mitigation systems?

108. Does your state require a vapor mitigation system to operate for a specified period of time?

109. How does your state handle risk communication and public perception?
  • Lets Responsible Parties handle it

  • Agency is directly involved

  • Other (explain below)


  • 110. Other modes of handling risk communication and public perception.

    111. Does your agency encourage the formation of community advisory groups at sites with known or potential vapor intrusion issues?



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