LARGE DIAMETER SEWER CONDITION ASSESSMENT Washington Navy Yard – Advisory Neighborhood Commissions 6B and 6D


As prescribed in the Environmental Protection Agency (EPA) consent decree, DC Water is inspecting the Lower East Side Interceptor (LESI) to assess the condition of this 66”-75” sewer pipe. This assessment will determine whether maintenance and/or repair will be needed to avoid potential future issues.  The consent decree requires this work to be done at least once every 5 years. Under this project, inspection will be performed on the portion of pipe between RFK stadium and Tingey Square (see location map on back).  



  • Inspection of approximately 12,000 linear feet of 66-inch-75-inch reinforced concrete pipe and brick sewer main 
  • Inspection of 28 access manholes along the sewer main 



  • Inspection start: Mid-August 2021  
  • Inspection completion: end of September 2021 
  • Normal work hours: 7:00 am – 4:00 pm, Monday through Friday  

*In order to minimize disturbance to daytime traffic, inspections being done on M Street SE (between 5th and Water Streets SE), and at 4th and Tingey Streets SE, will need to be done during nighttime hours. The area of proposed night work is shown on the location map on back. 



  • Inspections will be performed under normal flow conditions, so there should be no impacts to area customers’ sewer services during the work. 
  • Construction vehicles needed for this project will only include daily/nightly staging of two vehicles by our Contractor-one vehicle on both the upstream and downstream manholes along the sewer alignment.  



  • Traffic control, including signage and protective barriers, will be set up to maintain public safety.  
  • Lane closures will be required on M Street SE with approved traffic plans by the District Department of Transportation (DDOT). 
  • Notifications regarding “No-Parking” zones will be posted 72 hours prior to required inspection access, as required by DDOT. 



DC Water is currently working closely with DDOT to ensure minimal disruption during this project. Regular updates will also be provided to impacted residents, Advisory Neighborhood Commissions 6B and 6D, Ward 6 representatives in the Mayor’s Office of Community Relations and Services, and Ward 6 Councilmember Charles Allen and members of his staff.