Commission continues 60 Deerfield Road hearing after high groundwater and town‑property mitigation discussion

The Needham Conservation Commission continued the hearing for 60 Deerfield Road on Feb. 12 after field consultant Diane and staff discussed site constraints and mitigation on adjacent town forest land.

Diane said test pits showed a high groundwater table (~36–40 inches below grade) and that the existing garage and long driveway will be removed, reducing impervious area within the commission’s jurisdiction. She described a proposed split‑rail fence and resource‑area markers to demarcate the 25‑foot no‑disturb zone and suggested planting native shrubs on town property as mitigation, pending written permission from park and recreation staff.

Commissioners and staff expressed concern about placing infiltration systems close to high groundwater and recommended either siting infiltration in higher ground or confirming placement during construction with an updated evaluation. Tim suggested using a retaining wall or boulders placed at the 25‑foot line as a durable demarcation to prevent future property‑owner confusion. The hearing was continued to 02/26/2026 because a DEP file number was not yet assigned and several technical details remain unresolved.