The Apalachicola-Chattahoochee-Flint Stakeholders soldiers on, but behind closed doors. The group, which is paying for a data-driven study of the river basin that includes Lake Lanier, plans to follow through on a December vote by members to keep findings secret when it meets again Wednesday and Thursday in Apalachicola, Fla. The group’s governing board expects to hear from Georgia Tech’s Georgia Water Resources Institute on the study’s progress, as well as other technical information, with those parts of the meeting closed to the public.