09/18/2025 CONSERVATION COMMISSION Minutes

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Town of Mashpee Conservation Commission 16 Great Neck Road North Mashpee, MA 02649 NOI 34 Triton Way, 11771 Calla Lilly, LLC. Proposed Construct of Single-Family home (Representative: Merrill Engineering and Land Surveyors) 43- 3367 • Represented by Tim Santos of MBL Land Surveyors and Engineers with landscape architect, Mark Mazzarelli. • Mr. Santos explained that the property, currently developed with a deteriorated single-family home, decks, driveway, and lawn, lies entirely within 150 feet of the coastal bank and adjacent to Nantucket Sound. Resource areas include the coastal bank itself, velocity and flood zones, and nearby wetlands. • The project proposes tearing down the existing house and constructing a new single-family dwelling with a pool and patio at the rear. All roof runoffs would be directed into dry wells. A new Title V septic system with nitrogen-reducing technology would replace the existing system, lowering nitrogen levels from 12.82 ppm under current conditions to 3.98 ppm under the proposala reduction of more than two-thirds. The septic system would be located more than 100 feet from the coastal bank. • Mr. Santos emphasized that the proposed rear deck would not extend closer to the bank than the current one, remaining 24.3 feet from the top of bank once reconstruction of the approved bank- repair project is complete. Mitigation calculations required 5,620 square feet, and the applicant proposed over 6,100 square feet of native planting. • Mr. Mazzarelli presented the planting plan, noting the challenge of blending native vegetation into the existing conditions. The design incorporated Cape Cod Cooperative Extension guidelines for spacing and species selection, focusing on filling understory areas while retaining existing tupelo and cedar trees. Planned species included serviceberry (Amelanchier), holly, rosebay magnolia, American dogwood, clethra, viburnum, winterberry, and Virginia sweetspire. He explained that the intent was to balance natural and built elements, enhancing stabilization and ecological value. • Commissioners raised concerns about the pool's location, approximately 30 feet from the top of the coastal bank. Mr. Santos noted the pool was set farther back than the existing deck and that the coastal bank restoration, approved earlier in the year, was scheduled to begin in October. He acknowledged that a lawn area was proposed in front of the pool but emphasized that lawn coverage would be reduced compared to the current 4,848 square feet on site. Commissioners suggested considering additional native shrubs instead of lawn to improve stabilization, and Mr. Santos agreed this could be discussed further. • Mr. Colombo sought clarification on pool dimensions, which were confirmed as 320 square feet with a depth of three to four feet for lap swimming. Other commissioners expressed continued unease with the pool's proximity to the erosion area, with one noting erosion had advanced since the last site visit, making the true distance appear less than 24 feet. Mr. Santos clarified that once the bank repair was complete, the measurement would indeed be 24 feet from the reconstructed bank to the deck. • When asked, Mr. Santos reported that lot coverage would be 17.2 percent. A commissioner expressed concern that the site, when viewed from the street, appeared unstable, particularly around the proposed garage area to the left of the house, where the land slopes down toward a neighbor's yard. Mr. Santos explained that no cutting into the bank would occur in that area; instead, the foundation would be dug into the slope with the grade naturally falling away from both the street and the neighboring property.