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Vapor Intrusion Regulation Update: Status and Impact of 2020 Supplemental Guidance

Date: Tuesday, December 15, 2020
Time: All Day

Vapor Intrusion is the migration of chemical vapors from the subsurface into commercial and residential buildings. Vapors can migrate through soil and into buildings through cracks in foundations, basements, crawl spaces and sewers. In February 2020, the Department of Toxic Substances Control, the San Francisco Bay Regional Water Quality Control Board, and the State Water Resources Control Board issued in draft form Supplemental Guidance: Screening and Evaluating Vapor Intrusion which recommends a consistent approach when screening buildings for subsurface vapor risk to occupants and describes a framework for deciding when cleanup and/or mitigation is needed.

The regulated community expected regulators to finalize the long-awaited Guidance, but that may be delayed now that recent studies performed by the DTSC have emerged showing that the Supplemental Vapor Intrusion Guidance may have gone too far in its estimation of risk. The delay may provide some relief to site owners due to concerns that the attenuation factors prescribed in the Guidance were too conservative and would have made it impossible to achieve closure for sites with soil vapor contamination.

You are invited to attend a Zoom webinar on December 15 as Viviana Heger, Of Counsel at Meyers Nave, and Environmental Scientists Jeffrey Dagdigian and Mark Shifflett of Waterstone Environmental, Inc. explore key vapor intrusion issues, including:

  • History and legal framework related to vapor intrusion
  • Uncertain future of the February 2020 Draft Supplemental Guidance
  • Screening Levels to evaluate potential site risks during due diligence and brownfield redevelopments, and delays in site closure
  • Recent DTSC “California” VI study aimed at evaluating California-specific attenuation factors
  • Legal concerns, including litigation and the enforceability of agency directives in the absence of binding regulations

Date: Tuesday, December 15
Time12:00 - 1:00 PM
Virtual PresentationThe webinar will be provided on the Zoom platform. You will receive an email with log-on instructions after completing your registration.
Cost: Complimentary
RSVP: Please click here to register by 5:00 PM on December 14.

MCLE: This webinar has been approved for one hour of MCLE credit by the State Bar of California. Meyers Nave, a Professional Law Corporation, is a MCLE licensed provider. PN #10416.
QUESTIONS: Please contact Stephanie Hill at 800.464.3559 or shill@meyersnave.com