The Southborough Conservation Commission continued a public hearing on a stormwater management permit application for the Fay School’s proposed 9,000-square-foot addition at 48 Main Street (Map 53, Lot 11). Civil engineer Chris Sondy of Niche Engineering presented the project; Diane Byrne from Fay School and the project architect were also on the call.

Sondy described a modest land disturbance of about 26,000 square feet for an addition that would add four classrooms and a multipurpose room. The design includes relocating existing storm drains that currently run under the building footprint and installing an underground infiltration detention system sized to capture approximately 737 cubic feet (the applicant said that equals roughly the 1.7-inch volume of runoff from the impervious area on site). The roof and pavement runoff will be routed into the infiltration chambers and an overflow will continue to the existing outfall headwall, the team said. The design team emphasized that project limits are outside the 100-foot wetland buffer.

Commission staff and members noted the town’s peer reviewer, Fuss & O’Neill, had not submitted comments yet; commissioners and the applicant agreed to continue the hearing to the commission’s March 6 meeting to allow peer-review comments and responses. No formal action was taken on permit approval at the Feb. 13 hearing.

Sondy said fees for peer review were received and that utilities — water, electric and sewer relocations — will be coordinated as part of the site work. The commission’s continuation preserves party rights for public comment at the next scheduled hearing.