Messages left for several officials with the company that operates the Taylor County landfill, Indiana-based Veolia Environmental Services, were not returned.
Francis, the TVA spokesman, said a decision concerning the disposal of the rest of the coal ash sludge should be made soon.
"By doing the tests using different [types of rail] cars and things of that nature, we can make decisions on the best way to go," Francis said.
The impact coal ash has on the environment also would be considered, he said.
"We want to make sure it's the safest way," Francis said. "When you do demonstrations, it gives you a sound basis [to make a decision]."
While TVA officials investigate where to put the coal ash that breached an earthen dam near Kingston, Tenn., workers continue dredging the still-wet sludge and clearing roads around the Fossil Plant in Tennessee.
Tom Kilgore, president and CEO, told the TVA Board of Directors on Thursday several lawsuits filed after the Dec. 22 spill are pending in federal court but TVA has already reached settlements with 46 families and six businesses damaged by the sludge.
Soon after the spill, the federal Environmental Protection Agency began developing regulations to address the management of the coal ash, a by-product coal-fired power plants. The EPA said it expects to begin taking public comment on proposed rules by the end of the year.
At the same time, the spill prompted environmental groups to increase their warnings about the potential increased risk of cancer and other help problems for people living coal ash disposal sites; there are 11 coal ash disposal sites in seven Georgia counties.