1 / 10

Connecticut Remediation Standard Regulations: Volatilization Criteria

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)

knox-craig
Download Presentation

Connecticut Remediation Standard Regulations: Volatilization Criteria

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Connecticut Remediation Standard Regulations:Volatilization Criteria

  2. 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 22a-133k-3(c)(1)&(2)

  3. 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 ACMEInc. MW1 MW2 MW3s+d MW4 Basement Basement UST Vertical Flow GW flow direction Not to Scale

  4. 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) 22a-133k-3(c)(1)&(3)(A)&(3)(B)&(5)(A)&(5)(B)

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

  6. 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 22a-133k-3(c)(3)(B)

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

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

  9. 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 22a-133k-3(f)(3)

  10. Volatilization Criteria Q & A

More Related