Tommy Long (Left), U.S. Army Corps of Engineers Nashville District’s resident engineer for the Chickamauga Lock Replacement Project, updates Vice Adm. Charles Ray (Second from Left), U.S. Coast Guard deputy commandant for Operations, on the ongoing excavation work to remove 100,000 cubic yards of rock from the riverbed. Lt. Col. Cullen Jones, Nashville District commander, and Daniel T. Moore, Tennessee Valley Authority Dam Safety civil engineer, also provided updates. Long explained that there have been about 130 blasts so far with about a third of the excavation work completed. Ray, the incoming assistant commandant of the Coast Guard, visited the lock at Tennessee River mile 471 in Chattanooga, Tenn., May 4, 2018.