Workers wearing latex gloves empty sediment samples from the floor of the harbor in Charleston, S.C., on Friday, Nov. 9, 2012. The samples, being emptied into a stainless steel box in a boat on the harbor, are required for a study of a $300 million deepening of the harbor shipping channel so it can handle larger container ships. (AP Photo/Bruce Smith).

Associated Press
Workers wearing latex gloves empty sediment samples from the floor of the harbor in Charleston, S.C., on Friday, Nov. 9, 2012. The samples, being emptied into a stainless steel box in a boat on the harbor, are  required for a study of a $300 million deepening of the harbor shipping channel so it can handle larger container ships. (AP Photo/Bruce Smith).
Workers wearing latex gloves empty sediment samples from the floor of the harbor in Charleston, S.C., on Friday, Nov. 9, 2012. The samples, being emptied into a stainless steel box in a boat on the harbor, are required for a study of a $300 million deepening of the harbor shipping channel so it can handle larger container ships. (AP Photo/Bruce Smith).
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