South Burlington Planning Commission forwards LDR, official map updates; bedrock‑removal noise standards flagged for rewrite

The South Burlington Planning Commission voted unanimously to forward draft amendments to the city's Land Development Regulations (LDR 25‑01 through 25‑07) and a related Official Map amendment (OM 25‑01) to City Council, after staff presented a multi‑topic package and the commission heard more than an hour of public comment focused on bedrock removal and construction noise.

The package forwarded to council includes seven topic groups staff described as: minor and technical edits; revised methods for calculating building heights; updated supporting uses for commercial areas (including limited accommodations); a consolidated commercial table of uses with scale components; updates to the City Center form‑based code; new development standards addressing construction/bedrock removal; and several small zoning district and official map adjustments limited to the City Center area.

Why it matters: the bedrock removal and construction‑noise element drew sustained public concern and commissioner scrutiny because the draft relies largely on a reasonableness/performance standard rather than a numeric decibel limit. Residents said the draft lacked enforceable standards or monitoring protocols and asked for maximum decibel levels, duration limits and clearer enforcement mechanisms. Staff argued the proposed approach gives the Development Review Board (DRB) the tools to assess methods case‑by‑case and noted the DRB can require independent technical review at the applicant's expense.

Staff presentation and scope Kelsey, a city planner, led a high‑level walkthrough of the edits and pointed to plain‑language "spotlight" summaries on the city website that accompany the redline and clean drafts. She said the official map amendment is limited to the City Center form‑based code area and that the set of edits comprises many line‑by‑line changes grouped under seven high‑level topics. Among the more substantive changes, staff said they are: updating the grade standard used to measure building height (move toward an average finished grade approach aligned with the International Building Code); allowing accessory dwelling units (ADUs) in accessory structures; consolidating overlapping commercial use categories and adding a scale factor to distinguish a small storefront from a large retail operation; and adjusting City Center lot‑level design standards (faade, glazing, frontage and optional master planning for large parcels).

Bedrock removal and noise: public concerns and staff approach Public commenters emphasized health, welfare and quality‑of‑life harms from repeated blasting and heavy mechanical chipping. "People can be severely hurt by a single blast of noise," said Jimmy Lease, who described prolonged top‑hammer drilling and hydraulic chipping on other projects and urged the commission to adopt explicit limits rather than informational requirements. Other residents urged decibel limits (examples discussed in the hearing ranged from concerns at 70 dB up to higher thresholds), limits on daily hours and total duration, and clear third‑party monitoring and enforcement provisions.

Staff explained the draft LDR language would require a bedrock removal plan in many circumstances and proposes DRB review using explicit criteria (methods of removal, location, projected noise, sequencing, cost and mitigation). Staff noted the Vermont blasting guidance document describes components of a blasting plan (pre‑blast surveys, monitoring, sequencing and notification) but does not itself set a maximum decibel standard. Staff also pointed out the city's nuisance ordinance and Appendix A performance standards cover ongoing operational noise (and are being updated at the council level), but construction‑phase activities do not always fit neatly into those existing nuisance categories.

Technical review and enforcement Commissioners and public asked for specifics about measurement, monitoring and enforcement. Staff confirmed the DRB may require independent technical review (an expert paid for by the applicant) and that enforcement tools exist (administrative notices, court remedies, and ordinance violations with civil penalties), but each enforcement route has tradeoffs in speed, cost and evidentiary burden. Several commissioners urged staff to return with a stronger, more prescriptive approach (possible decibel metric, clearer hours/duration limits, and monitoring protocols), while others worried that imposing an untested numeric ceiling now could unintentionally ban necessary construction methods or lead to delays and higher costs for projects.

Other notable public and staff items - Staff identified several editing errors and recommended corrections: restore "TO" (transit overlay) permissions for medical/social services and general commercial uses in portions of the medium‑scale neighborhood (MSN) where the TO label had been dropped accidentally; reinstate omitted footnote text for the Food Hub use; add diagrams to clarify height‑calculation rules; and re‑include an exemption for existing mobile home parks inadvertently removed while reworking multiple‑principal‑structure language. - Staff clarified small zoning map tweaks (for example, adjusting a parcel on Joy Drive so an existing school is in a district that permits educational facilities) and explained official map tweaks in City Center to better show future roads, paths and connections to the planned I‑89 bike/ped bridge. - Tree spacing in the form‑based code was discussed: staff recommended returning to prior practice (30‑foot spacing in the T5 main street subdistrict and 50 feet in lower‑scale districts), not the uniform spacing originally drafted.

Votes at a glance - Motion to open public hearing on LDR 25‑01 through 25‑07 and OM 25‑01: moved, seconded and passed unanimously (commission recorded as "Aye"; roll call not recorded in the transcript). (Action: motion; outcome: approved) - Motion to close public hearing: moved, seconded and passed unanimously. (Action: motion; outcome: approved) - Motion to approve draft amendments to the Land Development Regulations (LDR 25‑01 through LDR 25‑07) with staff recommended edits and the changes noted during the meeting, and to submit the package and reports to City Council: moved by Commissioner Duncan, seconded, passed unanimously. (Action: motion; outcome: approved) - Motion to approve draft amendments to the Official Map (OM 25‑01) with staff recommended edits and submit to City Council: moved, seconded and passed unanimously. (Action: motion; outcome: approved)

What comes next The commission voted to forward the drafts to City Council with the staff edits and commissioner‑noted corrections and to explicitly flag bedrock removal and construction‑noise standards for near‑term revision. Commissioners asked staff to return with additional technical recommendations (possible numeric noise metrics, hours and duration limits, monitoring protocols, and enforcement pathways) and discussed placing a rewrite of the bedrock/noise section high on their work plan so City Council and the public will see a strengthened draft in a subsequent review.

Attribution: quotes and attributions in this article come from Planning Commission meeting transcript and public comment at the hearing; speakers are identified by name where the transcript provides it.