Hot off the presses, here’s some interesting analysis on the rapid curtailment of case closures (NFA letters) issued to sites in California by the State Water Resources Control Board’s regional offices since the unofficial/official adoption of the draft Vapor Intrusion Guidance. In 2020, RWQCB issued 70% fewer case closures as compared to the 2017-2019 average. Matt Winefield, MS, MBA, PE Jay Tufano #vaporintrusion

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