Washington Aqueduct Pilot Study Trailer
Exterior view of the Advanced Treatment Pilot Study blue trailer at the McMillan Water Treatment Plant, Washington Aqueduct, District of Columbia, Dec. 19, 2018. The U.S. Capitol Building is seen in the background. (U.S. Army photo by Sarah Lazo)

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Photo by: Sarah Lazo |  VIRIN: 181219-A-AQ354-0001.JPG