The potential for “significant impacts” on socioeconomics and water and biological resources were the chief concerns among people commenting on the U.S. Army Corps of Engineers’ future operation of the Apalachicola-Chattahoochee-Flint River Basin. The comments are summarized in a March “scoping” report by an Atlanta firm, Tetra Tech, on behalf of the corps. The corps received 3,621 comments in three different formal scopings — the last one ending Jan. 14 — from 965 people, organizations and agencies on a manual update for the ACF, which includes Lake Lanier.