Connecticut Remediation Standard Regulations Volatilization Criteria Volatilization Criteria

Volatilization Criteria Applicability ¨ Volatilization Criteria applies to groundwater within 15 feet of the

Risk from vapor intrusion only pertains when groundwater is polluted with VOCs at the

Demonstrating Compliance with Volatilization Criteria ¨ GW Volatilization Criteria (Primary Compliance) ¨ SV Volatilization

Soil Vapor Volatilization Criteria ¨Soil vapor samples must be collected beneath a building to

Mitigation ¨ Remediation of groundwater for volatilization is not required if measures acceptable to

No Building ¨If no building exists, Volatilization Criteria do not apply – Requires: ¨Environmental

Indoor Air Data ¨ Commissioner approval ¨ Long-term monitoring ¨ May include environmental measures

Applying the Volatilization Criteria (applies to both groundwater and soil vapor) ¨ all samples

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Connecticut Remediation Standard Regulations: Volatilization Criteria

Volatilization Criteria Applicability ¨ Volatilization Criteria applies to groundwater within 15 feet of the ground surface (or within 15 feet beneath the lowest level of a building) ¨ There is no horizontal component to the applicability 22 a-133 k-3(c)(1)&(2)

Risk from vapor intrusion only pertains when groundwater is polluted with VOCs at the water table – Standard wells (with representative screens bisecting the water table) are required to demonstrate compliance ACME Inc. MW 1 MW 2 MW 3 s+d MW 4 Basement UST Verti GW flow direction Not to Scale cal F low Basement

Demonstrating Compliance with Volatilization Criteria ¨ GW Volatilization Criteria (Primary Compliance) ¨ SV Volatilization Criteria (Alternative Compliance) ¨ Undertake mitigation (Exemption) ¨ No building can be constructed (Exception) ¨ Conduct indoor air monitoring (Exemption) 22 a-133 k-3(c)(1)&(3)(A)&(3)(B)&(5)(A)&(5)(B)

Soil Vapor Volatilization Criteria ¨Soil vapor samples must be collected beneath a building to be compared to the Soil Vapor Volatilization Criteria ¨Soil vapor samples collected outside the footprint of the building cannot be used to demonstrate compliance 22 a-133 k-3(c)(3)(A)

Mitigation ¨ Remediation of groundwater for volatilization is not required if measures acceptable to the Commissioner are taken to prevent the migration of vapors into any overlying building 22 a-133 k-3(c)(3)(B)

No Building ¨If no building exists, Volatilization Criteria do not apply – Requires: ¨Environmental Land Use Restriction or ¨Commissioner approval 22 a-133 k-3(c)(5)(A)

Indoor Air Data ¨ Commissioner approval ¨ Long-term monitoring ¨ May include environmental measures 22 a-133 k-3(c)(5)(B)

Applying the Volatilization Criteria (applies to both groundwater and soil vapor) ¨ all samples <= to the applicable criteria ¨ 95% UCL no longer an option: ¨ Not protective – did not evaluate building structure and air handling practices ¨ No institutional controls were required to ensure conditions wouldn’t change 22 a-133 k-3(f)(3)

Volatilization Criteria Q&A