The Conservation Commission discussed a proposed change to a major site plan at 200 Turnpike Road on Feb. 13 and indicated that an administrative amendment and updated as‑built documentation would be acceptable provided the work remains outside the wetland buffer and does not alter the site’s hydrology.

Project engineer Peter Bemis said the change replaces a planned nine-foot gap of asphalt between two structures with a continuous building roof and adjusts roof drain routing into the existing underground treatment system. Bemis said the impervious area does not increase materially and the modified roof drains improve treatment effectiveness.

Commissioners asked for a clear red-line overlay showing the deltas from the recorded plan; staff requested updated stormwater management plan (SMP) documentation reflecting the drain changes and an amended Order of Conditions (OOC) or annotated plan of record. The commission agreed the applicant could submit a red-line set to staff and the commission would treat the submittal administratively rather than holding a formal hearing, provided the revised materials demonstrate no new buffer impacts and show the updated drainage routing. The applicant will submit the red-line overlay and SMP updates ahead of the certificate-of-compliance review.