Schnabel, as part of the Owner’s Advisory (OA) team, assisted AlexRenew with critical  decision-making required to advance the RiverRenew program including development of conceptual designs and alignments, garnering stakeholder support to construct the tunnel system in historic Alexandria Virginia and obtaining regulatory permission to proceed. In parallel, Design-Build contracting was selected to fast-track the Project procurement.

In response to a 2017 Virginia State Law, AlexRenew has implemented a plan to address the discharge of combined sewer overflows (CSOs) to Alexandria, Virginia’s waterways. The plan, referred to as RiverRenew, is the largest infrastructure project in Alexandria’s history and has the following major components: a 12-foot inside diameter storage and conveyance tunnel system linking the existing CSOs to a new pumping station located at AlexRenew’s Water Resource Recovery Facility; a new 6-foot diameter sewer pipeline installed by open-cut and micro-tunnel boring machine; an increase in pumping capacity and a wet weather treatment system. The schedule stipulated by Virginia State Law requires the tunnel system be completed by July 1, 2026. Construction began in October 2020 and the project is expected to finish on time.

As part of the Owner’s team, Schnabel’s full-spectrum of services have included: concept planning; alternatives analysis; tunnel alignment selection; planning and overseeing geotechnical investigations; developing program management processes; preliminary engineering; generating RFQ/P documents; geotechnical and structural design reviews; constructability reviews; scheduling and estimating; mentoring and training; public outreach, project risk management, construction management, and oversight of resident engineering and inspections services