EPA public meeting set for April as Concord oversight committee presses for remediation timeline and neighbor protections

The 29 Main Street Oversight Committee on March 6 confirmed the U.S. Environmental Protection Agency will hold a public meeting on April 2 and urged EPA staff to present not just what has occurred but a clear timeline for what will happen next.

The committee said residents want to see forward-looking schedules and visual aids that illustrate risk trends. "Having maps that show that this footprint is reducing over time would be helpful visually for risk communication," said Sheriff Ray Covesa, the committee chair, urging updated figures that mark wells with vapor-intrusion action levels.

Why it matters: Committee members said the public expects to hear when major remedial steps will occur, what monitoring will remain in perpetuity, and when the site might be considered ready for transfer or redevelopment. Members also asked the EPA presenter (Cara) to briefly address how much public input can still shape remediation choices.

Vapor intrusion and PFAS review: The chair summarized two written comments from a committee reviewer referred to as Pam: one asked that the figures make clear the small set of wells that cross the vapor-intrusion action threshold, and the other relayed a persistent concern from a nearby Acton-based activist, Kim Caston, that the northern edge of the organics plume is "poorly bound." A committee member summarized the EPA view: "EPA's position has always been that it is well bounded, that the data show that," and the panel agreed to review the underlying data before the April meeting.

Holden Basin and construction schedule: The committee said it has received a 100% remedial design for the Holden Basin that shows construction starting next year, with a public meeting anticipated in the fall when the design is released. Chair Ray Covesa said schedule changes resulted from delays in EPA responses to the contractor (Maximus) and cautioned members that the timing slipped by months rather than weeks.

Neighbor concerns about slurry-wall work: During public comment a nearby property owner said long-term residents are worried about traffic, noise and air quality during slurry-wall installation. "We've lived on our property for over 40 years," said Bob Anderson, identifying himself as the closest property owner to the slurry wall, and asking about dust monitors and air monitoring plans.

Committee members described construction methods used for slurry walls — sequential "dig and fill" panels, guide walls and wet slurry methods that reduce dust — and said the team plans to use dust-control measures and monitoring. The group noted panels total 44 in the plan, panels are typically about 3 feet thick, and wall widths are often near 30 inches; breaking into bedrock at depth could be the loudest activity.

Next steps: The committee set a March 6 follow-up meeting to finish water-quality review and plans to press the EPA presenter at the April 2 public meeting to include basic scheduling milestones and an overview of options that remain for remediation and reuse. The oversight group said it will circulate presentation links and documents in advance so members can prepare questions.