The primary discussion centered around Lake Shirley’s recent treatment to control invasive species like fan wart. This rise in phosphorus is significant as it exceeds the 20 micrograms per liter threshold more frequently than in previous years, posing potential risks for algal blooms. In contrast, nitrogen levels remained stable. The treatment effectively reduced the presence of fan wart, a threat to biodiversity, but also impacted native species more than anticipated due to unforeseen hydraulic conditions affecting herbicide application.

During the meeting, Wendy Gendron outlined the lake management activities, including an annual report noting a 5.8-foot drawdown achieved to manage aquatic plants, with no reported fish kills. Concerns were raised about a downstream gauge that has been non-operational for years, complicating lake management efforts. The commission discussed the necessity of recalibrating the gauge to ensure effective monitoring. Algal sampling showed an increase in phytoplankton density, although levels remained below the state advisory threshold.

The ecological survey revealed a reduction in plant richness, with a significant decline in bio volume and plant density from 2024 to 2025. Despite these challenges, there was optimism about the recovery of native plant species like robins pondweed. The treatment successfully limited fan wart to two observation locations out of 66, highlighting a successful suppression of this invasive plant. The ongoing lake management plan will continue monitoring fan wart and may include algicides due to elevated phosphorus levels.

In another discussion, the commission reviewed a proposed septic system installation on Flynn Road, near Lake Shirley. The project, presented by Chris McKenzie, involved replacing a failed system with a new treatment unit and pump chamber. The system’s location, just outside the 30-foot no-disturbance zone and within the 50-foot buffer zone, raised concerns. Richard stressed the need for a formal letter confirming exhaustive exploration of all potential locations for the leach field, given the commission’s precedent against approving systems so close to the buffer zones.

The meeting also addressed tree removal and planting near wetlands, particularly concerning infested ash trees. The commission discussed minimizing disturbance during removal and the potential for understory shrubs as replacements. Discussions acknowledged the importance of maintaining a canopy for wetland stabilization, with flexibility in replacement locations considered for erosion control.

In a separate topic, the commission debated fee structure revisions. This proposal aims to modernize the fee schedule and streamline the process for future changes.

The commission also prepared for upcoming events, including the MAC convention and Earth Day activities. Plans for Earth Day included potential volunteer opportunities, clean-up initiatives, and collaborations with local organizations. The conversation recognized the short notice for planning significant events but emphasized starting small to build momentum for future efforts.

As the meeting concluded, updates on stormwater initiatives were highlighted. An upcoming public information session will discuss a proposed stormwater utility to establish a separate fund for maintenance, reflecting new MS4 permit regulations. The utility would apply to all residents, with fees based on impermeable surfaces for commercial properties.