12/11/2025 CONSERVATION COMMISSION Minutes (2)

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Town of Mashpee Conservation Commission 16 Great Neck Road North Mashpee, MA 02649 replaced with a surface-level distribution approach using perforated piping over crushed stone within the crawl space area(eliminating subsurface leaching due to proximity to the abutter's septic). The septic tank location was also adjusted to avoid conflict with the front steps. The plan added details for securing a shed with helical piles or diamond piers to address concerns about flotation during coastal storms. Architect Timothy Luff(Architect Associates, Inc.) explained the floodplain-related design approach, stating the structure is proposed on piers (rather than a foundation) and is being designed to meet more stringent V-zone-style construction methodology, even if an A-zone approach could otherwise apply, in response to Commission feedback and flood-resiliency concerns. Commission discussion focused heavily on flood behavior and the adequacy of the peer review's modeling. One commissioner expressed strong dissatisfaction with the "bathtub model"methodology used, stating it does not address channelization dynamics and does not alleviate concerns about flow concentration between closely spaced structures. Other commissioners emphasized that the peer review was completed at the Commission's request by an approved reviewer and should not be held against the applicant, while acknowledging the limitations inherent in conducting complex hydrologic analyses for a single-family residential project. Additional Commission concerns and clarifications included potential grade/topography changes and whether the project would increase elevation in a way that could direct water toward abutters. The applicant clarified that a proposed increase is limited and controlled by a six-inch granite curb, with revisions pulling the curb line back approximately one foot from the rear property line and maintaining existing grade between the curb and the boundary to preserve drainage pathways. The Commission also discussed stone size for the gravel areas; the applicant indicated proposed stone would be approximately 3/4-inch to 1-inch, and Commissioners suggested gravel sizing could be incorporated as a condition to improve stability and resistance to movement during flooding. The Commission briefly revisited the waiver discussion, with one commissioner noting the need for a "compelling need" showing for certain waiver criteria (distinguishing the need to elevate the structure versus doubling the structure size). Counsel reiterated the applicant's position on waiver applicability under the legacy regulation framework, and the Chair noted the floodplain is considered a resource area for Commission purposes. It was indicated that the applicant has appeared multiple times, submitted the requested reports, and revised address Commission concerns. A recommended condition was raised that the construction supervisor provide regular(weekly) progress/maintenance reports during construction due to tight site conditions along the road. MOTION: To close an issue at 28 Wilsons Grove with the following conditions: 1. Stones no smaller than 3/4 inch be used 2. Construction Supervisor follow-up with staff on a weekly basis for a construction report throughout the demolition and final phase of the project Motion by: Richard Sahl Seconded by: Sandi Godfrey Vote: Motion carries. Aye: Paul Colombo, Sandi Godfrey, Richard Sahl, Seana Pitt Nay: Sarah Thornbrugh 4