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DTSC, Water Board outline ‘path to closure’ findings: robust conceptual models, early scoping speed closure
Summary
CalEPA practitioners told workshop attendees that case studies show scoping meetings, robust conceptual site models, site-specific data coverage, and source removal accelerate closure of vapor-intrusion sites; alternate endpoints and stewardship were identified as common outcomes.
Department of Toxic Substances Control and State Water Board staff described a range of site outcomes and practical steps that have helped move vapor-intrusion sites to closure since the agencies issued supplemental guidance in 2023. Ben Stanfill of DTSC summarized the CalEPA "path to closure" review, which surveyed case managers and project managers on sites that had reached closure or entered long-term stewardship after the guidance. He said closure can take multiple forms: unrestricted "no further action," media-specific closures (for example, soil closed while groundwater remains under management),…
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