Case Studies Demonstrating Impact of Cal-EPA Draft Supplemental Vapor Intrusion Guidelines

​The summary below provides real world case studies of how the Cal-EPA Draft Supplemental Vapor Intrusion Guidelines (DSVIG) are being used as de facto regulations (without environmental benefit) and killing projects throughout the state. Winefield & Associates, Inc. urges Cal-EPA to adopt the attenuation factors (AFs) recently developed by the Department of Toxic Substances Control (DTSC). DTSC has developed AFs from a California-specific database that are much more representative of vapor intrusion potential than AFs now in the DSVIG. DTSC’s work has been scientifically peer reviewed through the same process required for Cal-EPA regulations (Health and Safety Code §57004). DTSC’s AFs are now the best available science for statewide vapor intrusion guidance.

For more information about the DTSC AF evaluation, click here: https://dtsc.ca.gov/vapor-intrusion/.

​To share additional examples of how the DSVIG is thwarting site revitalizations, please email that information to Matt Winefield at [email protected].     ​

DSVIG Case Studies
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