That's according to a preliminary analysis by civil engineering firm Moffat & Nichol designed to assess the need for the new terminal.
"It is a number that we must keep refining," said Bill Bethea, a member of the terminal task force and a former S.C. State Ports Authority chairman.
Breaking from fierce competition between Charleston and Savannah, Govs. Mark Sanford and Sonny Perdue announced the terminal agreement in March 2007. Bethea, of Hilton Head, and other task force members eventually will produce a bi-state compact, subject to approval by the South Carolina and Georgia legislatures and Congress, to address financing and operations for the terminal.
The Moffat & Nichol study found that container volume should grow by 6.7 percent annually through 2025 and then 5.3 percent annually from 2025 to 2050.