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Commission alerted to silt-bag failure at Minutehan Lane; contractors stopped pumping and will remove bag
Summary
Staff reported a dewatering operation at Minutehan Lane where a large filter 'dirtbag' ruptured, releasing muddy silt into a pond and briefly clouding a downstream stream; contractors stopped pumping, will remove the bag, and staff will inspect the site Monday to determine cleanup needs.
Marlborough City conservation staff told the commission Dec. 19 that a silt-control filter bag used in a dewatering operation at Minutehan Lane had bulged and failed overnight, releasing muddy material into an adjacent pond.
According to staff, the dewatering setup included a large filter bag designed to trap silt while allowing cleaner water to discharge. "The bag got bigger, and then it popped," staff said, describing a sudden release that temporarily made the stream opaque. Contractors stopped pumping the same day; staff said they will remove the filter bag and will return Monday to assess how much material must be scraped from the pond.
Staff reported the downstream stream returned mostly clear by afternoon after dilution and cessation of pumping, though some residual silt remained on the pond bottom. Staff said they will not order contractors to clean the stream channel but will focus first on the pond where the bulk of the material accumulated and will determine next steps after inspection.
The commission discussed the incident during other-business reports and encouraged staff follow-up; members were invited to visit the site over the weekend to observe conditions. Staff said they would confirm cleanup plans and expected contractor activity to resume on Monday after removal of the failed bag.
(Reporting note: summary based on transcript remarks during the commission meeting.)
