A plan to fill in space at the Hall County landfill could extend the facility’s lifespan, but time is of the essence to do the work. Officials are hoping to finish “redeveloping” an older section, where earth has settled, by April, or by the time another area where the county is operating fills up. But first they need approval from the Hall County Board of Commissioners, which is set to hear the redevelopment proposal this week, and the Georgia Environmental Protection Division.