Fairfax County begins stream‑stabilization work on Reston Association land; construction to run about a year

Fairfax County staff and contractor representatives told Reston Association residents that construction on a Piney Run tributary stream‑stabilization project has entered the construction phase and will begin after a notice to proceed dated April 1, 2026. Ram Gimiri, the project manager, said, "This project will stabilize approximately 1,500 linear feet of stream channel" and aims to reduce erosion, protect exposed sanitary sewer infrastructure and improve water quality.

County staff and the contractor described a one‑year construction schedule (April 2026–April 2027) with about 45 additional days for punch‑list and project closeout. Ram Gimiri said the county obtained the required permits and that regulatory drivers include the municipal separate storm sewer system (MS4) permit and total maximum daily load (TMDL) requirements tied to Chesapeake Bay water‑quality goals. Staff said the county issued a notice to proceed last week and that the contractor has mobilized for preconstruction activities.

Charles (county staff) said the design evolved to reduce tree impacts and limit the construction footprint. "We reduced tree take from about 115 to 74," he said, and described a tree‑preservation and protection plan. The county plans significant replanting; staff reported "171 overstory trees" to be planted as part of the native‑vegetation restoration program and said the design uses "super clump" plantings to improve survival and outcompete invasives.

Staff and consultants described construction sequence and site protections: preconstruction surveying and flagging, installation of a construction entrance on the Pink Trail, perimeter erosion‑control measures, cleared work segments, and timber‑matting and mulch over staging and stockpile areas to protect tree roots. The contractor (identified in the meeting as EQR; an earlier reference in the presentation used the acronym AQR) said deliveries will be staggered and that heavy equipment and dump trucks will access the site via Center Harbor Road; the contractor estimated busy days could see multiple truckloads and said they expect roughly "5 to 10 truckloads" on typical heavy days.

Residents pressed staff on timing for tree removal, weekend work and traffic impacts. Ram Gimiri said tree removal would likely begin about two to three weeks after mobilization and that weekend work is not typical; if weekend work becomes necessary the contractor would notify the county and the county would aim to give the community about 48 hours' notice. On traffic, the contractor said they will stage deliveries and provide on‑site traffic monitoring to avoid blocking cul‑de‑sac movements used by school buses and neighbors.

Residents also asked about hydrology and mosquito risk. Oliver (staff/engineer) said the stream reach is mostly intermittent and will behave similarly after construction: pools will fill after storms, and standing water in pools is expected to be about a foot deep and not remain longer than about 48 hours. Charles said the design eliminates outfall pools near the Pink Trail specifically because of mosquito concerns.

On post‑construction oversight, staff described a warranty and monitoring plan: a one‑year contractor warranty after substantial completion, an intensive three‑year monitoring period carried out by county vegetation/inspection teams, and longer‑term checks extending up to the 10‑year monitoring timeframe staff discussed during the meeting. Staff invited residents to an on‑site walk at the Pink Trail entrance (Center Harbor Road) at 1 p.m. on Saturday and encouraged anyone not already on the project email list to contact Charles, Ben Rhodes (property owner/Reston Association) or Ram to join distribution for updates and notices.

The meeting closed after staff confirmed they will post the recording and project materials to the project web page and after they answered a final group of resident questions about flagging, stakes and the limits of disturbance. No formal motions or votes were taken at the meeting.