08/06/2026 CONSERVATION COMMISSION Minutes

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Town of Mashpee Conservation Commission 16 Great Neck Road North Mashpee, MA 02649 NOI 190 Monomoscoy Road,Kevin Cayer. Proposed new single-family dwelling with mitigation plantings. (Representative: Cape & Islands Engineering, Inc.) (cont. 11.23 /2.05 /3.05 /3.19/ 5.07) 43- 3258 Representatives from Cape & Islands Engineering, Inc. appeared on behalf of the applicant, Kevin Cayer, regarding the proposed construction of a new single-family dwelling with mitigation plantings at 190 Monomoscoy Road. Mr. Cayer was also present. The applicant's representative noted that although the matter had been continued several times, this was the third substantive presentation, with prior continuances allowing time for requested documents and revisions. The revised design reduced the size of the house and relocated it outside the 50-foot buffer to bordering vegetated wetlands and the 75-foot buffer to the ACEC. The house was revised to be supported on piers, and the septic design was changed from the previously proposed MicroFAST system to a best available nitrogen-reducing technology. The previously proposed retaining walls for the septic system and driveway were eliminated, and a dewatering basin was added to the plans in the event dewatering became necessary. The landscaping plan was expanded to include native plantings throughout most of the property,with approximately 900 square feet of lawn primarily over the septic system. Disturbed areas within the Town road layout would be restored with native species. Roof runoff would be managed through drywells, and a crushed- stone driveway was proposed. Although the property is within an AE flood zone rather than a velocity zone, the applicant agreed at the Commission's request to construct the house on piers as though it were within a velocity zone and increased the first-floor elevation to 14.5. Mr. Colombo questioned the nitrogen calculations for the revised septic system, noting the difference between the system's approximately 19-milligram-per-liter effluent concentration and the overall site calculation of approximately 7.343 milligrams per liter. The applicant explained that the required calculation evaluates the property as a whole and that the MassDEP-approved concentration for the proposed system is approximately 19 milligrams per liter, compared with approximately 35 milligrams per liter for a conventional Title 5 system. Mr. Colombo also asked whether the two groundwater monitoring wells installed in March had been checked again. The applicant stated that no additional readings had been taken because efforts had focused on revisions requested by the Commission, but that the wells could remain and additional monitoring could be performed. Ms. Pitt asked about groundwater flow. The applicant stated that monitoring-well measurements indicated flow from Great River toward Little River, although conditions farther inland could differ. Ms. Pitt acknowledged that the house had been relocated outside the buffer but remained concerned about installation of a new septic system within a buffer zone. The applicant noted that the proposed system would include nitrogen-reducing technology and UV treatment for pathogens and viruses. Mr. Sahl questioned how the various site components factored into the overall nitrogen calculation. The applicant explained that the approximately 7.343-milligram-per-liter calculation accounted for manageable nitrogen sources associated with the site and did not include naturally occurring nitrogen. The Commission reviewed erosion controls, native plantings, the crushed-stone walking path, limited lawn area and proposed pier foundation. Mr. Colombo asked what would be located beneath the elevated house. The applicant stated that no concrete slab was proposed and that the area would remain permeable, likely using crushed stone or similar material. The applicant agreed that a condition could prohibit a concrete or impervious slab beneath the house. 10