A severely eroded ditch along N. Glebe Road near Chain Bridge is set for some restoration work.
The Arlington County Board this weekend is expected to approve a contract of up to $1.2 million. At least part of that will be reimbursed by VDOT, which maintains the road.
The work follows a major water main break in November 2019, which damaged both the road and the roadside ditch.
More from a county staff report:
This project includes the restoration of the existing ditch located along the south side of North Glebe Road (Route 120) that was severely eroded following the 36” transmission water main break in November 2019. Arlington County Department of Environmental Services (DES,) Virginia Department of Transportation (VDOT) and the National Park Service (NPS) have partnered to implement this improvement and restoration project. The restoration includes 500 feet of the ditch downstream of the water main break and stabilization improvements for 1,000 feet of the ditch upstream of the break to be improved with Class II riprap, as well as new guardrail installation to replace a previous guardrail and temporary jersey wall and restoration of the Potomac Heritage National Scenic Trail, which crosses this ditch in the downstream segment underneath George Washington Memorial Parkway.
The work also includes tree removal and planting/seeding, erosion and sediment control, and all other related incidental work described and required in the contract documents. Most of the work is planned to be performed at night utilizing an overnight road closure of North Glebe Road as outlined in the VDOT approved Temporary Traffic Control Plan. VDOT is reimbursing the County for the construction costs of the improvements located upstream of the water main break.
The report goes on to note that the county hired a consultant, Wetland Studies and Solutions Inc., to develop the repair plan.
Additionally, the report says the accepted bid — from Fairfax-based Bright Construction Group — is 13% higher than an engineer’s estimate, likely owing to complications caused by the rugged terrain and the work area being on both National Park Service and VDOT property.
…it is believed that the bidders perceived more risk and challenges in these bid items, which we consider fair given the unique challenges of this project area, where the contractor will be working on an actively flowing stream channel on NPS Lands, as well as within the narrow shoulder of a two-lane undivided VDOT-owned arterial roadway, North Glebe Road (US Route 120), that carries approximately 11,000 vehicles per day. For the work on Federal Lands and in VDOT right-of-way, the contractor will have to comply with restrictive NPS and VDOT permit requirements and perform all restoration as per each agency’s specifications.
The Board is scheduled to vote on the contract during its meeting this Saturday.