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  • DC Water Combined Sewer Overflow NEPA Compliance
  • DC Water Combined Sewer Overflow NEPA Compliance
  • DC Water Combined Sewer Overflow NEPA Compliance

DC Water Combined Sewer Overflow NEPA Compliance

District of Columbia since the Metro was built. Following a Consent Decree aimed to minimize combined sewer overflow into nearby rivers, the District of Columbia Water and Sewer Authority (DC Water) proposed a 13-mile, 23-foot diameter tunnel be constructed up to 100 feet underground, as well as associated hydraulic structures to store and convey the combined sewer overflow.

Because much of the associated infrastructure would be located on National Park Service (NPS) property, Straughan adhered to both the general and NPS specific National Environmental Policy Act (NEPA) criteria throughout the development of the Environmental Assessment. To facilitate the NEPA environmental documentation, Straughan conducted wetland delineations, forest stand delineations, cultural resources investigations, and public outreach. Straughan also assisted with the coordination among the local, regional, and federal agencies and other project stakeholders including the U.S. Navy, U.S. Air Force, and the Army Corps of Engineers.

Straughan successfully prepared the environmental documentation, which resulted in a Finding of No Significant Impact (FONSI) decision document, and met the accelerated project schedule to support the schedule mandated in the consent decree.