The Charles River Dam removal project was a focal point, described as an ecological restoration limited project. This classification, while not meeting all criteria for straightforward ecological restoration, aligns with regulatory guidelines for safety and environmental enhancement. The project includes the removal of the spillway and fish ladder while leaving the earth and berm structure intact. The 16-acre impoundment upstream will transition to wetland resources, a process crucial for restoring natural sediment transport and improving groundwater supply.

The procedure involves lowering the Charles River impoundment through gate openings, followed by constructing a coffer dam downstream to maintain a dry work area. The plan is designed to ensure controlled water flow and capture debris. The sediment management strategy avoids mechanical dredging, instead seeking a 401 water quality certification to dredge approximately 11,500 cubic yards of sediment.

Commission members inquired about sediment and turbidity management, acknowledging temporary changes in water quality without coinciding with sensitive ecological periods. The sediment samples tested revealed acceptable levels of metals and petroleum byproducts, mitigating concerns about downstream contamination. The project is scheduled for construction in 2026, emphasizing summer months to accommodate ecological considerations.

Another topic was the Chapter 91 program discussion, focusing on the dam removal’s regulatory requirements. Representatives sought an exemption from permitting due to the unlicensed spillway, while a sediment monitoring program addresses downstream sediment accumulation concerns. The town plans to monitor sediment movement actively. Public engagement in the Chapter 91 process is encouraged, with materials available online for transparency.

Concerns from residents included sediment’s potential impact on property and river flow alterations. The commission reassured that sediment release would be gradual, monitored closely to prevent adverse effects. The project is expected to improve flood control by eliminating dam failure risks and enhancing the riverfront’s pollution filtration capacity.

The meeting also covered other environmental projects, including tree removal on Pine Street. Homeowner Andrew Dee proposed removing dead and diseased trees, with the commission highlighting the importance of preserving tree cover. Discussions involved potential replanting, with Dee open to collaboration on revegetating the area and addressing invasive species.

The Commission reviewed a septic system replacement on Indian Ridge Road, necessitated by a failed Title V system. The project involves removing existing trees, with the commission deeming it an acceptable trade-off for improved environmental benefits. The conversation also touched on a notice of intent for 216 to 218 South Main Street, addressing stormwater and wetland issues for a proposed residential development.

Additionally, a proposal for repurposing a parking lot on Morenci Street was discussed. The plan includes installing a stone diaphragm to control runoff, reducing impervious area and screening dumpsters. The commission moved to issue an order of conditions.