The U.S. Army Corps of Engineers is wrestling over how to deal with sunken or abandoned boats and docks in Lake Lanier. Basically, the corps’ lawyers have said the agency can’t use federal money to do any removal unless the vessel is “determined to be a hazard,” said Tim Rainey, the corps’ operations project manager at Lanier. A legal document regarding the matter “is written primarily for navigation channels for commercial traffic, but it does mention fairways, or normal routes for boating traffic,” he said.