08/06/2026 CONSERVATION COMMISSION Minutes

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Town of Mashpee Conservation Commission 16 Great Neck Road North Mashpee, MA 02649 and stated that the work was believed to qualify for an exemption applicable to maintenance within the existing paved footprint. Parking would be reduced from 46 to 41 spaces. The Commission reviewed existing and proposed drainage conditions. The existing parking lot experiences flooding, with excess runoff ultimately flowing toward the beach or surrounding areas. Under the proposed design, runoff would be directed through the bioretention and underground infiltration systems, with larger storm events overflowing toward the forested area west of the project rather than directly toward the beach or pond. The Commission also reviewed long-term maintenance of the drainage system. Mr. Houle explained that pretreatment measures would reduce sediment entering the system and that accumulated sediment could be removed through the proposed manhole and manifold system. Ms. Laurent stated that DPW would maintain the system under its operation and maintenance program for Town drainage infrastructure. The limit of work, erosion controls, overflow outlet and associated site improvements were reviewed. Compost filter tubes were proposed for erosion control. The overflow apron was designed to minimize additional buffer-zone disturbance and avoid encroachment toward an isolated wetland. Accessibility improvements included relocation of the existing accessibility mat,handicapped parking and walkway improvements and an accessible route to the pavilion area. The Commission questioned whether the plans submitted for permitting would become the plans of record, as they were marked for progress review and not for construction. Mr. Houle explained that the submitted plans constituted the permit set and that final construction documents would provide additional bidding and construction details without changing the permitted design or impact areas. A final construction set would be submitted before work began. The Commission discussed the limited separation between the underground infiltration system and seasonal high groundwater, including groundwater mounding, and questioned system performance during larger and back-to-back storms. Mr. Houle acknowledged the challenging groundwater conditions but stated that larger storm events had been modeled and that the proposed system represented a significant improvement over existing conditions. Construction was anticipated to begin in the fall, with final paving and completion potentially extending into the spring. Ms. Laurent stated that large excavations would not be left open during significant storms and that work would be scheduled around forecast conditions. The site would be closed during construction. Potential dewatering was also discussed. Mr. Houle stated that dewatering would be addressed with the contractor if groundwater was encountered, with discharge directed toward the western area rather than the beach. The Commission discussed requiring dewatering details and submission of the final construction plans to Conservation staff as conditions of approval. The Commission also questioned whether the fill required to raise the parking lot could create unintended impacts. Mr. Houle stated that he did not anticipate adverse impacts and noted that the existing parking lot experienced substantial ponding with little stormwater treatment. He stated that the proposed improvements would provide an overall benefit to the area. No comments were received from the audience or online participants. MOTION: Close and issue an Order of Conditions for 35 Lake Avenue (Attaquin Park), Town of Mashpee, with conditions that final construction plans be submitted showing final details and that dewatering details be provided to Conservation staff. Motion by: Richard Sahl Seconded by: Seana Pitt Vote: Vote passed unanimously by roll call vote (Steve Cook, Paul Colombo, Richard Sahl, Seana Pitt) 7