Remediate Alexandria's Combined Sewer Outfalls

AlexRenew and the National Park Service (NPS) seeks your input.

Alexandria's century-old combined sewer system consists of only one pipe that conveys both sanitary sewage and captured rainwater. On sunny days, all sewage flows to the AlexRenew's Water Resource Recovery Facility. When it rains, the pipes can become overwhelmed with a mixture of sewage and rainwater, which is discharged into our waterways via four permitted outfalls.

Pursuant to the National Environmental Policy Act of 1969 (NEPA), U.S.C. 4332(2)(C), the NPS and Alexandria Renew Enterprises (AlexRenew) are preparing an Environmental Assessment (EA) to consider potential environmental effects of RiverRenew, a major infrastructure initiative to remediate the City of Alexandria's combined sewer system. RiverRenew (Proposed Action) falls within, and adjacent to the Potomac River waterfront including Jones Point Park, the Alexandria Seaport Foundation property, and the George Washington Memorial Parkway (see Figure 1, RiverRenew Study Area Map). NPS has initiated consultation under Section 106 of the National Historic Preservation Act (NHPA) separate from, but concurrent with the EA, per the NHPA and its
implementing regulations (36 CFR 800.8).

The purpose of the proposed action's is to reduce combined sewer overflows (CSO) into the Potomac River, Hooffs Run, and Hunting Creek from Alexandria's four existing combined sewer outfalls (CSOs 001- 004) during rain events. The outfall locations are shown on Figure 1. The Proposed Action is necessary to comply with a mandate from the Commonwealth of Virginia's State Legislature to reduce CSOs by July 1, 2025. AlexRenew and the City of Alexandria have established a partnership to comply with this milestone and have jointly authored a Long Term Control Plan Update (LTCPU) that establishes an approach to reduce Alexandria's CSOs. The LTCPU was developed to comply with legislative requirements established by the Virginia General Assembly, Virginia Department of Environmental Quality's Bacteria Total Maximum Daily Load for Hunting Creek, and the U.S. Environmental Protection Agency's CSO Policy.

RiverRenew includes a new network of storage/conveyance tunnels and sewers that will collect combined sewage flows prior to discharge at the CSO outfalls and convey those flows to the AlexRenew Water Resource Recovery Facility (WRRF) for treatment and discharge. Diversion facilities will be constructed at the existing CSO outfalls to connect the combined sewer system to the new network of deep tunnels and sewers. The WRRF will also be upgraded to increase treatment capacity during wet weather events.
Comment Period: Closed        09/10/2018 - 10/25/2018
Document Content:
signed_scoping_AlexRenew.pdfsigned_scoping_AlexRenew.pdf   (2.1 MB, PDF file)
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