Vienna board delays Green Hedges School expansion after neighbors raise noise and traffic concerns

The Vienna Board of Zoning Appeals on Thursday postponed action on Green Hedges School’s application to amend its conditional use permit after lengthy presentations and extensive public comment about noise and neighborhood traffic.

Kelly O’Brien, deputy director, told the board the request would increase the school’s enrollment cap from 190 to 210 students and staff from 42 to 50, and authorize campus changes including a new academic building, reconfigured circulation and added parking. O’Brien said staff tied enrollment increases to mitigation and phasing requirements and that the Planning Commission had voted 4–3 to recommend denial because it remained unconvinced mitigation would protect adjacent residents.

The applicant’s team — attorney Sarah Mariska, Board Chair Jessica Wadlow and interim head of school Peter Barrett — said the campus plan, developed over four years, would modernize aging buildings and add buffers, new sidewalks and circulation improvements. Barrett said the increase in students was “modest” and would help keep tuition reasonable while funding campus improvements. Mariska emphasized that proposed conditions would replace multiple older CUPs with a single, clearer set of requirements.

Noise and its mitigation became the focal point of the hearing. The applicant hired an acoustics firm (PolySonics) to monitor playground sound and model future scenarios; the team said on-site monitoring between 09:40 and 12:40 recorded playground averages around the mid-50s decibels with modeled peak contours up to roughly 69–75 dB on site and that fences, a 15-foot buffer and relocated play structures would reduce peak exposure to neighbors by about 5 dB in modeled scenarios. “Distance is the most effective mitigation,” the applicant’s presentation stated, and proposed conditions would require buffers and other measures before any enrollment increases.

Neighbors disputed those conclusions. Vienna residents said intermittent peak noise, not average sound levels, most affects their daily life and questioned whether modeled reductions would be perceptible at nearby yards. Catherine Welch, who lives on Dole Street NW, told the board that “noise mitigation measures are estimated to drop by about 4.5 decibels, but my house is nearest and our levels are mitigated by less than 2 decibels — differences of less than 2 decibels cannot be perceived by humans.” Multiple residents also described existing queuing, on-street overflow and safety concerns around drop-off and pick-up.

Board members pressed applicants on specifics of the traffic modeling, stacking capacity and enforceability of phased mitigation. The applicant said circulation changes would add stacking capacity (for example, modeled Nutley-side capacity rose in the applicant’s analysis), that school staff would actively manage arrival and dismissal, and that major construction would be staged to limit neighborhood disruption and would require subsequent site-plan and county permitting steps.

After public comment and board discussion — including concern that locked doors earlier in the evening might have kept some people out — a board member moved to defer the matter to the June 17 meeting and to accept written testimony through May 29. The motion passed on a roll call vote; the board will resume deliberations after reviewing additional submissions and materials. The board’s deferral leaves the current CUP conditions in place; if the amendment is ultimately denied, the school would continue to operate under existing approvals.

The board’s administrative record includes the applicant’s conditions and the acoustics report; staff said phased conditions would tie any enrollment increase to installation of mitigation measures. The board did not adopt final conditions or take a final vote at the meeting.