Sewer director outlines $36M plant upgrades and Sandwich Road force main; committee weighs costs and environmental questions

The Wareham Finance Committee on June 1 heard a detailed briefing from the town sewer director, Scott (director, Sewer Department), on recent $36 million plant upgrades, plans for a new high‑density polyethylene (HDPE) force main along Sandwich Road and preliminary modeling that shows a Narrows outfall could achieve significant nitrogen reductions at substantially lower cost than prior outfall concepts.

Scott told the committee the recently contracted headworks and clarifier package includes two new clarifiers with about two million gallons per day of treatment capacity, a new sodium‑hydroxide pH system replacing a problematic soda ash arrangement, and a redundant headworks screen to reduce rags and debris. “We have something that’s going to last,” Scott said, describing the upgrades as reducing daily operational failures and clarifying that the work is intended to serve future growth as well as current needs.

On the force main, Scott said he halted a $6 million balloon‑liner plan because the lining technology was unlikely to be durable for the town’s projected service life. Instead, engineers proposed a fused HDPE pipe under Sandwich Road sized for future flows and fitted with stubs for future tie‑ins. Scott said that approach produces a single structurally sound contiguous line that should last decades.

Scott also described modeling by an outside institute that suggests locating the treated‑effluent outfall near the Narrows could provide substantial nitrogen reduction because of depth and flushing characteristics there, potentially accomplishing CWMP (Comprehensive Wastewater Management Plan) goals years earlier and at a fraction of the cost of previously studied alternatives. He said the Narrows option reduces the need for a far‑off outfall (which earlier estimates put at tens to hundreds of millions of dollars).

Committee members focused on financing and impacts. Under current assumptions, debt service for the work would be paid from the sewer enterprise fund and sewer users; one member argued the whole town benefits and should share some costs. Scott noted potential grant funding and said regional partners (for example, nearby towns with available capacity) could augment plant flows, lowering unit treatment costs. He estimated the Sandwich Road main could be installed in roughly two to three years and broader outfall work completed in three to four years, noting ongoing studies would firm those estimates.

Members also raised environmental and community concerns about an outfall near the Narrows. A committee member warned that discharging large volumes of fresh or brackish effluent into a narrow, dredged channel used for recreation and habitat could alter salinity and local ecology and urged reliance on Army Corps permitting and diffuser design to mitigate impacts. Scott responded that deeper water and faster dispersion at the Narrows could reduce nitrogen concentrations compared with earlier shallow outfall options and that modeling remains preliminary.

The committee approved routine minutes from April 13 and April 27 and did not take a formal financing vote in this meeting. Scott and town staff were asked to continue modeling, finalize outfall evaluations and return with refined schedules and funding options to inform future town‑meeting action.

What happens next: engineering studies and permitting on the outfall and force main will continue; the committee signaled it needs clearer cost shares and funding scenarios before recommending specific borrowing or user rate changes.