Two aluminum-processing industries in Tennessee have submitted preliminary plans to construct a landfill behind the county airport, a proposal similar to one two years ago that was voted down by commissioners. The 95.2-acre landfill proposed by Tennessee Aluminum Processors Inc. and Smelter Service Corp. will be discussed at a city planning commission meeting on 5 January 2010. Any aluminum by-product would be separated from the groundwater by a 12-inch thick leachate collection system, a 7-foot clay buffer, two high density polyethylene liners and a clay liner, according to the plans.