Washington Aqueduct Pilot Study Operator
Ben Orchard, environmental engineer and pilot operator with CDM Smith, handles water samples inside the Advanced Treatment Pilot Study trailer at the McMillan Water Treatment Plant, Washington Aqueduct, District of Columbia, Dec. 19, 2018. (U.S. Army photo by Sarah Lazo)

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Photo by: Sarah Lazo |  VIRIN: 181219-A-AQ354-0003.JPG