[CPEO-BIF] Analyzing sewer and utility tunnel pathways for vapor intrusion

[Lenny Siegel <lsiegel@cpeo.org>]

Vapor Intrusion in the Regulatory Community: How ESTCP is Impacting Investigations

SERDP/ESTCP
July 10, 2019

Environmental Screening Levels (ESLs) are concentrations for groundwater, soil, soil gas, and indoor air derived by the San Francisco Bay Regional Water Quality Control Board for over 100 chemicals to allow direct comparison to environmental sample data collected at contaminated sites. The ESLs are developed to help the San Francisco Bay Regional Water Board (RWB) staff protect water quality in the region. In early 2019, the San Francisco Bay Regional Water Quality Control Board released a  User’s Guide that explained how these ESLs are derived and how they should and should not be used.  The User’s Guide provides a regulatory basis for the ESLs, their history and use, a comparison to other available screening levels, the RWB’s approach to site closure evaluations, and other technical documents for use in combination with the ESLs. In Section 5.4.1 (Vapor Conduit Pathway Evaluations: Sewer/Utility Conduit Air), the Guidance recommends usage of the Investigation Protocol developed by Dr. Thomas McHugh from GSI Environmental, Inc. and his team under ESTCP project  ER-201505 until formal regulatory agency guidance is developed.

Although the sewer and utility tunnel pathways are often mentioned in regulatory guidance documents, there is little information detailing the conceptual model or assessment methods….


For the entire article and live links, see
https://www.serdp-estcp.org/Program-Areas/Environmental-Restoration/Contaminated-Groundwater/Emerging-Issues/ER-201505/ER-201505-FR

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Lenny Siegel
Executive Director
Center for Public Environmental Oversight
A project of the Pacific Studies Center
LSiegel@cpeo.org
P.O. Box 998, Mountain View, CA 94042
Voice/Fax: 650-961-8918
http://www.cpeo.org





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