"This evaluation covers the approximately 30,000 cubic yards of material to be excavated from the South Beach Marina Federal project channel. . . The authorized South Beach Marina Federal project channel is 10 feet deep, 100 feet wide and 2,035 feet long. . . The channel has not been dredged since its construction in 1978, and will be dredged to a depth of -11 feet MLLW to ensure that the authorized depth is maintained for as long as possible between dredging events."