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Town presents Marshall Road/Robert Boulevard stormwater upgrades to reduce phosphorus to reservoir
Summary
Town staff described proposed MS4 best‑management practices on Marshall Road and Robert Boulevard to capture sediment and reduce phosphorus to the South Charlton Reservoir; work is largely outside the 100‑foot buffer but will require procurement for hydrodynamic separator maintenance.
Town staff briefed the commission on a proposed set of stormwater improvements on Marshall Road and Robert Boulevard designed to reduce phosphorus discharges to the South Charlton Reservoir, a waterbody listed with a total maximum daily load for phosphorus.
The proposed work would install three deep sand catch basins, swales to reduce erosive flow velocities, piping to route runoff and hydrodynamic separators for two of the basins to remove suspended solids and phosphorus before discharge to Ketch Basin and the reservoir. Staff said most work—about 99 percent—falls outside the 100‑foot buffer for the reservoir; one catch basin is in a location closer to the lake and will require attention.
Town staff told the commission the hydrodynamic separator units require maintenance by a vacuum truck and the DPW does not own that equipment, so the town will need to contract out maintenance or identify a vendor. Lead times for the specially sized hydrodynamic separator may be as long as eight weeks, which could push construction to spring unless an alternate vendor can deliver sooner; staff said they were pursuing a vendor who might deliver earlier and that a long mild fall could allow November installation.
Staff framed the work as part of the town's MS4 (Municipal Separate Storm Sewer System) obligations and noted the South Charlton Reservoir has a TMDL requiring an 11 percent phosphorus reduction attributable to town‑owned infrastructure. No formal vote was required at the meeting; the item was presented for informational review and to notify the commission that no NOI filing is required because most work is outside resource areas.
Commissioners asked questions about schedule and funding. Staff said funds would be sought within existing DPW or stormwater budgets and that final procurement, delivery timing and maintenance arrangements need to be resolved before construction.
Staff asked commissioners if they wanted further review; commissioners indicated they understood the scope and no formal permit filing was required because the majority of the work is outside regulated buffer zones.
