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Committee hears technical explanation for oxygen variability and isolated shutdowns at RNG plant
Summary
Staff explained that oxygen variability in landfill gas stems from many wells (200–220), cover integrity, broken pipes, and occasional animal damage; a reported 20 hours of shutdown was cumulative across isolated events rather than one continuous outage, officials said.
During technical Q&A, a committee member asked what determines oxygen concentration in landfill gas. "There's a large number of wells in the landfill... at least 200, 220 wells," Greg Comperta replied, explaining that each well is a potential point of oxygen ingress from loose hoses, leaking components or ground intrusion through cover.
Comperta said operators continuously adjust well suction and that settling, pipe breaks, or even animal damage ("I've seen deer chew out of them") can cause temporary oxygen intrusion that is corrected with maintenance. He added that recent added cover to portions of the landfill likely helped reduce oxygen levels.
On the reported 20-hour operational shutdown, a committee member noted that 20 hours is almost a full day. Comperta clarified the 20 hours were cumulative across multiple, isolated events over the month rather than a single continuous outage, and that June overall was "a pretty good month."
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