One month after a collapsed pipeline north of Washington, D.C., spilled more than 240 million gallons of raw sewage into the Potomac River—potentially the largest wastewater spill in U.S. history—weather and site issues continue to hamper efforts to clear the damaged section and begin repairs. Further questions remain regarding the time and investment needed to restore the critical infrastructure and reduce environmental impacts, even with a Feb. 22 disaster declaration and fresh aid from the U.S. Army Corps of Engineers and other federal agencies. The Jan. 19 collapse in Montgomery County, Md., occurred in a section of the 72-in.-dia. Potomac Interceptor operated by the District of Columbia Water and Sewer Authority (DC Water). Adjacent to the river near the I-495 Beltway crossing, the 1960s-era pipe is part of a regional system that conveys 60 million gallons of sewage daily from areas of northern Virginia and Maryland to the city’s Blue Plains wastewater treatment plant.…