Needham planning board hears traffic, noise and blasting concerns over proposed DPW fleet maintenance garage

Needham Planning Board members pressed town staff and consultants on traffic routing, noise and blasting risks during a public hearing on a proposed Department of Public Works (DPW) fleet maintenance facility at the Cogswell site on Central Ave.

Ken Sargent, senior project manager for the Town of Needham, and Tyler Cauffelecchi, project manager at Weston & Sampson, told the board the plan would convert one bay of the existing Cogswell storage garage and add a roughly 12,000-square-foot pre‑engineered metal building for vehicle maintenance, parts storage and staff support space. The proposal includes a covered exterior wash pad, expanded detention and bioretention basins for stormwater, a new low‑pressure sewer line to tie into the town system, and a generator sited north of the new building behind a 10‑foot sound wall.

The project team said site constraints require significant ledge removal — the consultant described a ledge wall on the site up to about 20 to 30 feet tall — and that the addition is proposed to be largely screened from Central Ave by the existing topography and trees. The design includes four proposed ground‑source heat pump wells (a test well is planned this summer) and rooftop solar as a bid alternate to move the building toward a net‑zero electric target.

Why it matters: DPW fleet maintenance moves from an existing, flood‑prone facility at 470 Central Ave to a site nearer the town’s vehicle operating areas (including RTS), shifting trips and heavy‑vehicle movements toward Central Ave and adjacent neighborhood streets. Residents raised concerns about sight lines, additional truck traffic on narrow streets (especially Marked Tree Road), noise from a standby generator and monthly generator testing, and ledge blasting during construction.

Details and public concerns: Weston & Sampson estimated the facility would staff six full‑time employees on site and provided a traffic estimate of about 32 additional vehicle trips per day tied to repair visits; the consultant said roughly 12 of those would be “heavy vehicles.” The project team said many of those trips currently originate from the RTS/ITS fleet next door and argued moving maintenance closer to the RTS fleet would reduce some cross‑town movements. Tyler Cauffecchi told the board that his firm’s sound study modeled the generator and topography and that measured nighttime background noise at the site is “roughly 30 decibels.” The team said MassDEP noise rules limit increases to 10 decibels above background, putting the project’s nighttime threshold at about 40 decibels along nearby property lines.

Residents urged more operational detail. Holly Clark, a Central Ave resident, told the board: “it’s like, it’s on fire, and we’re only bringing a little more gasoline,” urging a fuller traffic analysis that accounts for nearby projects (Claxton fields, a skate park and new daycare) and existing rush‑hour congestion. Multiple neighbors asked the applicant to document likely truck routes, how many trips would come from RTS rather than from other parts of town, and whether large vehicles would use Marked Tree Road. Walter Hobb and other residents asked whether the proposed heavy vehicles would use Marked Tree or High Rock into Central Ave and requested additional counts or routing data specific to Marked Tree.

Operational and mitigation commitments: The team described stormwater controls that expand existing basins and add treatment before discharging toward wetlands, an oil‑water separator for wash‑bay discharges that will route limited non‑stormwater to sewer (with MWRA and town permitting), and a maintenance regime for separators. The generator is described as emergency/standby power only; the firm expects monthly testing runs of about 15–30 minutes, during daytime hours where the allowable decibel increase is higher. The team proposed fencing atop the ledge and additional absorptive panels if post‑installation monitoring shows higher than modeled sound levels.

Board action and next steps: The board voted to continue the public hearing and request further materials. The board continued the hearing to June 17 (continued by voice vote; no recorded opposition) and asked the applicant to submit supplemental materials by June 10, including: a distribution of vehicle origins and typical routes (how many trips originate at RTS vs. other yards), a breakdown of heavy versus light vehicle trips and expected vendor/delivery frequencies, a construction management plan and schedule that specifies hours and blasting monitoring and pre‑construction vibration surveys of nearby houses, and any additional traffic counts or analysis that incorporate nearby planned uses (Claxton/park projects and the new daycare). The board also asked for a written list of the project’s environmental mitigations (oil‑water separator schedule, geothermal permitting status, dust control and pest control specifications) for use as permit conditions.

What the board did not decide: The hearing remains open; no permit was granted and no design waivers were approved at this meeting. Board members clarified the difference between discussion, requests for follow‑up, and a formal vote: the June 17 session will be set to review additional operational evidence and to determine the next procedural steps.

Ending: The board encouraged the applicant and town staff to provide the requested operational and routing detail so the Planning Board and the public can assess traffic and noise impacts in context. The board signaled it will consider permit conditions tied to noise limits, generator testing windows, and construction monitoring if the project proceeds to approval.