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MassDEP inspection finds gaps in vapor‑intrusion mitigation; proposes stricter operating‑regimen requirements
Summary
MassDEP presented 2025 inspections of active exposure pathway mitigation (APM) systems and found many sites lacked clear operating regimens, monitoring, or functioning instruments. Staff proposed requiring demonstrable correlation between extraction vacuum, sub‑slab pressure fields and indoor air, plus telemetry and defined vacuum ranges.
John Fitzgerald, who led a recent inspection initiative, told the advisory committee MassDEP inspected 16 APM sites in calendar year 2025 (a small subset of systems statewide) and found widespread deficiencies in documentation, monitoring and records.
Fitzgerald said department staff performed pressure and flow measurements, telemetry checks, indoor‑air and soil‑gas sampling, and reviews of design demonstrations. He said no imminent hazards were identified but the audits showed that six of 15 permanent‑solution sites had no operating regimen or O&M requirements, and six of…
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