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Blackstone Street vernal-pool waiver continued after commissioners request more hydrology and habitat data
Summary
The commission continued a hearing on proposed Blackstone Street improvements after members asked the applicant for more detailed hydrologic calculations, habitat evaluation for a certified vernal pool, quantified alternatives and snow-storage plans; the hearing was continued to Jan. 28.
The commission continued a public hearing on the Blackstone Street project after commissioners and peer reviewers identified missing or insufficient materials to judge impacts on a certified vernal pool and its 100-foot habitat buffer.
Ryan Rosine (consultant) and other applicant representatives presented and then took questions from the commission and peer reviewers (Beals & Thomas). Commissioners said the applicant’s waiver request rests in part on an argument that the buffer immediately south of a gravel roadway is degraded and does not provide standard buffer functions; several commissioners asked for scientific justification for that claim.
Specific materials the commission requested before continuation: a habitat evaluation for the vernal-pool buffer, revised wetland-replication plans, hydrologic and drainage calculations showing the proposed roadway and box-culvert changes will not increase inflow or otherwise alter the vernal-pool hydroperiod, a clearer alternatives analysis with quantified area impacts (and documentation of whether the listed square-foot numbers are estimates or calculated from design files), a snow-storage plan, and clearer flagging/delineation and construction controls to ensure the vernal pool is not lowered or otherwise degraded.
Applicant representatives said they would provide a habitat evaluation prepared by their wetland consultants and submit revised plans, and they explained design adjustments: shifting a proposed replication area and intercepting a problematic swale to bypass flow to the south side of the road (preserving existing flow paths rather than increasing flow to the vernal pool). The commission agreed those submittals are required and voted to continue the hearing to Jan. 28 at 7 p.m.
Why it matters: The project touches a certified vernal pool and associated habitat; commissioners emphasized the precautionary standard for vernal pools and requested peer-reviewable calculations and habitat data before making permitting decisions.
Next steps: Applicant to file the requested hydrologic calculations, habitat evaluation, replication drawings, and clarified alternatives; Beals & Thomas will peer-review the supplemental materials and the commission will revisit the hearing on Jan. 28.
