Drill rig operator drills hole
Drill Rig Operator John Blackson (right) and Helper Steve Seager, U.S. Army Corps of Engineers Baltimore District, drill a hole several hundred feet deep just downstream of the Saddle Dam to retrieve a needed core sample for the Nashville District March 14, 2012.

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Photo by: Lee Roberts |  VIRIN: 120314-A-CE999-003.JPG