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Planner proposes tree-code updates: canopy goals, trimming permits and hazard exemptions
Summary
The planner proposed revisions to the tree chapter to better preserve canopy, add permitting for certain trimming activities, and clarify exemptions for hazardous or nuisance trees if certified by an arborist. Commissioners debated scope, residential coverage and the definition of "significant" trees.
Planner presented suggested edits to the tree code, framing the chapter with guidance from a 2021 literature review about urban tree benefits and suggested targets (including three visible significant trees per property and 30% canopy coverage by neighborhood). Planner said the review is a background resource rather than a direct requirement for the town code.
Key proposals and clarifications:
- Scope: The draft currently covers nonresidential lots and residential lots inside the Historic Preservation District; it does not automatically extend regulation to residential lots outside the district unless the commission directs that expansion.
- Hazard and emergency removal: Planner proposed clarifying that property owners may remove hazard or nuisance trees when a qualified assessor or arborist declares a high or extreme risk; those removals would be exempt from replacement requirements and permit delays.
- Trimming and maintenance: The draft would require an administrative (Class 1) authorization for significant pruning or trimming to allow the town to track canopy-loss activities; the commission discussed exempting minimal pruning thresholds (for example, a single small cut) but did not finalize specifics.
- Significant-tree definition: The draft defines a "significant tree" by diameter-at-breast-height (DBH), with 6-inch DBH used as a working threshold in the draft. Several commissioners questioned whether 6 inches is too small and asked for species- or size-specific thresholds.
Commissioners asked for additional research on species-specific DBH thresholds used elsewhere and for clearer language to handle private-property variations (wind-prone tree removal and preemptive safety removals were discussed as common local drivers of tree removal). Planner said she will research comparative municipal language and may include species- or DBH-based thresholds for particular species in later drafts.
Ending: The commission asked planner to refine the chapter and return with revised language, including clearer thresholds for trimming exemptions and a better definition for "significant" trees.
