04/16/2026 SEWER COMMISSION Minutes

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Town of Mashpee Sewer Commission t 16 Great Neck Road North Mashpee, MA 02649 New Business • GHD Update Marc Drainville of GHD provided an update on wastewater projects, including Phase 1 completion status, Phase 2 construction progress, and preliminary Phase 3 planning. Phase 1 Status Phase 1, including subphase IA, is fully operational and available for connections. Connection notices have been issued, and approximately 80% of properties have connected, including 239 single-family homes. Additional connections include 29 permitted properties and 18 intent-to- connect notices, with 10 properties remaining in non-compliance. System flows have reached approximately 60,000 gallons per day, allowing initiation of final performance testing of the treatment facility, anticipated to begin at the end of the month and run for approximately 30 days. Wastewater is fully being treated through the facility, and disposal is occurring through the system's beds rather than being hauled. Phase 2 Construction Progress Phase 2 contracts are underway, with substantial completion anticipated in the mid-to-late portion of the following year. • Contract 1 (Treatment Facility): Work has focused on the administrative building, identified as the critical path item. Construction of the foundation, walls, and roof structure is complete, with interior slab work and electrical installation underway. Occupancy is projected for late in the year. • Contract 2 (Pump Stations): Site clearing is ongoing, and installation of wet wells had begun using driven sheeting to control excavation. • Contracts 3-6 (Linear/Piping Work): Installation of the collection system is progressing. A GIS tracking system was being developed to monitor completed and active work areas, with traffic updates provided weekly with a three-week look-ahead. Work was active in multiple areas, including near Town Hall and along Cotuit Road, with completed segments logged in real time. Contractors have encountered higher-than-expected groundwater levels in some areas, requiring adjustments. No scheduling issues have been reported for above-ground plant construction. Phase 3 Planning and Future Work Mr. Drainville presented preliminary planning for Phase 3, emphasizing that all layouts are conceptual and subject to change. Phase 3 is designed to address approximately 30% of the nitrogen reduction goal for Waquoit Bay and could serve up to 1,050 parcels, with an estimated project cost of approximately S250 million based on State Revolving Fund limits. Planning includes: • A mixed system of gravity and low-pressure sewer, with five proposed pumping stations • A proposed treatment plant site near John's Pond on Town-owned land • A potential recharge site near Moody Pond, currently under evaluation