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ZBA continues 250 Turnpike hearing after expert briefs on vernal-pool use, developer to study wildlife crossing
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Summary
The board continued the public hearing for FD 250 Turnpike LLC after hearing results of a March–April migration study documenting wood frogs and spotted salamanders using a detention basin that now functions as a vernal pool; consultants and peer reviewer will negotiate mitigation, including a possible wildlife crossing under the proposed road.
The Southborough Zoning Board of Appeals continued the public hearing for a proposed comprehensive permit at 250 Turnpike Road on advice from ecological consultants and the board's peer reviewer, after a migration study documented use of an on-site detention basin—now functioning as a vernal pool—by vernal-pool obligate species.
Brian Charleville of Ferris Development Group, representing FD 250 Turnpike LLC, said the developer commissioned Goddard Consulting to run a migration study in March and early April. Ryan Rosene of Goddard summarized the field work: the detention basin “would not meet the qualifications under natural heritage guidelines to qualify as a vernal pool” as phrased in the initial memo, but said the basin currently “functions” as a vernal pool and that Goddard observed obligate species, including spotted salamander and wood frogs, using the basin for breeding.
Rosene described the study's findings: roughly 50 amphibian observations in total, with estimated 20–23 individual wood frogs and about 13–18 spotted salamanders detected; trap and movement diagrams indicated most individuals entered the pool from the east and south. He said the study used best-practice guidance documents as a non-regulatory benchmark and that the site currently has degraded habitat (noting invasive plants in parts) but that mitigation opportunities exist, such as invasive-species removal and native plantings within a vernal-pool envelope (100-foot buffer) and within broader critical terrestrial habitat (up to 750 feet).
Rosene and the applicant's team said they are exploring a wildlife crossing—an engineered upland passage beneath the proposed road alignment at the narrowest point between the two wetland areas—to preserve connectivity and reduce the roadway's barrier effect. The applicant's engineer reported that the projected road elevation at that location provides roughly 10 feet of vertical clearance, which could enable a crossing sized for amphibian use.
Joe Orzo of Lucas Environmental, the board's peer reviewer, raised questions in a written review (distributed in early May) and requested clarification and additional materials. Orzo confirmed to the board that the Conservation Commission had previously determined the basin functions as a vernal pool and that the new field data meet certification criteria for vernal-pool evidence; he said Natural Heritage (Massachusetts Natural Heritage & Endangered Species Program) would be notified only if state-listed endangered or threatened species were present. Orzo recommended that Lucas and Goddard coordinate on mitigation details; both consultants and the applicant signaled they would continue technical discussions and return with a response.
Public commenters urged the board to consider engaging MassWildlife/Natural Heritage, and residents asked that the board ensure mitigation measures be durable and scientifically justified. The board agreed to continue the public hearing and extend the closing date to Aug. 31, 2025, and to hold a substantive follow-up at the July 16, 2025 meeting. The applicant also reported progress on septic design and said it would provide updated responses and design revisions ahead of the next hearing.
