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Independent peer review: Smith’s Creek odors traced to fugitive landfill gas and sulfate‑rich sludge; mitigation judged effective
Summary
Civil & Environmental Consultants told commissioners that 2023–24 odors at the Smith’s Creek Landfill resulted from temporary shortcomings in the gas‑collection system combined with concentrated sulfate‑rich Domtar paper‑mill sludge in cell eight. CEC found mitigation prompt and effective, concluded septage application was not the primary cause, and recommended tighter special‑waste approval and gas‑collection improvements.
An independent peer review presented April 2 concluded that the hydrogen‑sulfide odors detected in the Smith’s Creek landfill area in late 2023 and early 2024 were the result of fugitive landfill gas compounded by a concentrated deposit of sulfate‑rich Domtar paper‑mill sludge in cell eight.
"The odors were produced by an insufficiency in the gas extraction system," Mike Bodwin of Civil and Environmental Consultants (CEC) told the Board. He said the insufficiency was temporary, that mitigation steps were implemented quickly, and that monitoring shows a marked reduction in hydrogen‑sulfide emissions after…
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