06/11/2026 CONSERVATION COMMISSION Minutes

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Town of Mashpee Conservation Commission 16 Great Neck Road North Mashpee, MA 02649 NOI 45 Nehoiden Road, Richard Gorbaty & Jennifer Adelman. Proposed additions to an existing single- family home. (Representative: Webby Engineering Associates, Inc.) (coast. 5.07) 43- 3421 Joe Webby of Webby Engineering appeared on behalf of the applicants, accompanied by the project contractor. Mr. Webby stated that the proposal involves several modest additions to an existing single- family dwelling located within Land Subject to Coastal Storm Flowage. Mr. Webby reviewed the additional materials submitted in response to comments raised at the previous hearing. He reported that building plans had been provided, the location of the existing septic tank had been confirmed, calculations for the proposed dry wells during a 25-year storm event had been submitted, and it had been confinned that the property is not located within a Zone II aquifer protection area. Nitrogen loading calculations were also provided. In addition, Mr. Webby stated that the applicants were willing to preserve and relocate the existing arborvitaes elsewhere on the property. Discussion focused extensively on future flooding projections and the location of the existing septic system. It was noted that review of the MORIS Data Viewer indicated that the property could experience approximately 2.5 to 3 feet of inundation by 2050, including flooding in the area of the existing septic tank. Concern was expressed regarding the long-term viability of the septic system under those projected conditions and the fact that portions of the proposed addition would be located adjacent to the tank. Questions were raised regarding the structural supports proposed near the septic system. Mr. Webby explained that the Board of Health had reviewed the design and was comfortable with the proposed cantilevered addition,provided that access to the septic tank covers remained available for maintenance and pumping. He stated that the sonotube supports would be installed beside the tank rather than directly over it and that some footings had been designed to extend deeper in accordance with Board of Health recommendations. Discussion also occurred regarding the age of the septic system, with uncertainty expressed as to whether portions of the system dated to the original construction of the home. It was noted that, if replacement were eventually required, the existing tank could be decommissioned and a new system installed elsewhere on the property. The Commission also discussed the extent of the proposed additions and whether all new construction would remain within the footprint of existing structures. It was clarified that some portions of the project would replace existing deck areas, while at least one proposed addition would extend beyond the existing footprint. The applicant stated that other deck areas would be removed and that the overall amount of structural coverage would remain generally comparable. It was further noted that the project would require relief from the Zoning Board of Appeals related to lot coverage. A lengthy discussion followed regarding Regulation 25 and coastal resiliency requirements. Concern was expressed that, although the proposed structure would be elevated above base flood elevation and designed to allow floodwaters to pass beneath it, no emergency response or resiliency plan had been presented addressing the existing septic system under the future flooding scenarios identified through the MORIS Data Viewer. It was noted that the projected inundation maps indicate the septic system area could be underwater by 2050 and that the Commission's recently adopted coastal resiliency regulations require consideration of future flood impacts when reviewing projects within vulnerable coastal areas. 12