10/23/2025 CONSERVATION COMMISSION Minutes

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Town of Mashpee Conservation Commission 16 Great Neck Road North Mashpee, MA 02649 foundation will use an excavator with a drill head attachment, with debris trucked offsite or placed in roll-off containers. Commission Discussion—252 Shore Drive, Concert Ms. Thornbrugh commended the project team for improved documentation and thoughtful design revisions but raised several environmental and technical concerns. She questioned whether the proposed concrete ADA ramp could be replaced with wood or aluminum to lessen dune disturbance, why two soil borings were positioned within the dune rather than directly under the footprint of the new tent, and whether those borings were exempt under the Wetlands Protection Act or subject to additional restrictions under local bylaws. Engineer Brian Gation explained that concrete was selected for its durability and ability to withstand heavy use, and that the boring locations were chosen to ensure practical access and accurate subsurface data. Because of the existing foundation,borings had to be located adjacent to—but not directly beneath—the current tent to guide final foundation design. It was confirmed that the entire concrete slab will be removed, and Ms. Thornbrugh requested clarification on equipment access width along the northeast side. She asked whether the 16-foot gap between the building and erosion controls was sufficient for an excavator and requested updated plans showing labeled work zone dimensions. Clarification was also sought on the timeline and process for the borings. Ms. Raddatz stated that all borings would be completed within one to two days, would cause minimal disturbance, and that the site would be fully restored immediately afterward. Structural and Engineering Concerns—252 Shore Drive, Concert Several commissioners, including the Chair, raised engineering and safety concerns regarding the lack of detail in the submitted plans. The Commission noted that: • The number of pilings and their precise locations were not shown. • Scour protection, pile depth, and Velocity Zone compliance (Zone VE, Elev. 14) were unclear. • Current drawings only showed surface-level structural grids, not actual footings or piling details. • There was concern that shallow concrete footings could fail under wave action and erosion. Architect Megan Brady acknowledged these omissions and promised that a foundation plan prepared by a structural engineer would be provided. She clarified that the number of pilings and their configuration are determined by the structural grid, and the depth of footings will depend on the results of soil borings. It emphasized flood safety concerns, noting that the proposed tent floor elevation (12.6 ft) lies below the Velocity Zone elevation (14 ft). The Chair expressed concern that in a severe coastal storm, wave scour could 7