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Commission hears plan for large sewer interceptor replacement at MBTA crossing, continues hearing to February
Summary
Environmental consultants described a multi-segment sewer replacement project that will use trenchless pipejacking under the MBTA tracks and will temporarily disturb wetland resource areas for jacking pits; the Conservation Commission continued the hearing to Feb. 13 so staff can complete a draft order and review.
Environmental Partners and engineers briefed the Needham Conservation Commission on Jan. 23 about Phase 2 of a multi-year program to rehabilitate and replace segments of a large-diameter sewer interceptor that carries roughly one-third of the town—s sewage. The project area discussed centers near the end of Valley Road and an MBTA railroad crossing by the Herring Trail (DEP File 234-943).
Ben Mangan, project manager with Environmental Partners, said the overall project includes replacement work over a long run of sewer pipe; he described the scope as "about 23,100 linear feet" of pipe in varying diameters (18 to 24 inches) and said the segment discussed at the Jan. 23 hearing involves the area just east of the MBTA crossing. Mangan said the MBTA crossing section will be installed using a trenchless pipejacking method in a 42-inch steel casing to avoid open cutting of the railroad right-of-way.
Drew Gallant, project engineer, provided resource-area estimates the commission required for the filing. He said the jacking-pit work near the resource area will temporarily disturb about 45 linear feet of bank and about 310 square feet of bordering vegetated wetland (BVW). Gallant said those areas would be restored to preconstruction conditions upon completion. The team described environmental protections including perimeter filter sock, coffer dams and dewatering operations at the pits, and a temporary stream-bypass system using sandbag dams and pumps to maintain flow around the excavation.
The project team said the work would not increase impervious area and therefore the stormwater report is brief; they added that bidding in the summer would be ideal and that a final construction schedule would depend on contractor mobilization. The project team reported they checked NHESP (Natural Heritage & Endangered Species Program) resources and did not identify endangered species concerns in the immediate work area.
Commission members asked questions about timing and environmental protections; staff told the panel it had not yet completed a draft order and recommended continuing the hearing. The commission voted to continue the hearing to Feb. 13, 2025, to allow staff to prepare the draft order and give the applicant time to finalize design details. The motion to continue passed unanimously (recorded ayes: Bill; Fred; Sue; Helena; Reid; Chair Dave Harrow). No permit decision was made at the Jan. 23 meeting.
