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CHARLOTTE, N.C. -- There s another twist in the Coal Ash controversy.

The city of Charlotte is backing away from any consideration of using coal ash as structured fill dirt under construction at the airport.

Assistant City Manager Hyong Yi told NBC Charlotte s Investigative reporter Stuart by phone,

If at any point in the future there were some leak or failure we would have to dig it up. That would be incredibly disruptive. That is not a risk we are willing to assume, he said.

The Charlotte Observer posted a report online quoting interim aviation director Brent Cagle as saying he had concerns about placing the coal ash under infrastructure Cagle told the Observer those concerns are too great to warrant using coal ash at Charlotte Douglas - at least for construction.

In a statement to NBCCharlotte Cagle issued the following statement:

I have concerns associated with the use of coal ash as a fill material under any airfield related projects at Charlotte Douglas International Airport.

The Airport and the City are continuing to evaluate other options for beneficial reuse of the coal ash through the due diligence process.

The city will keep studying other potential uses and report to city council in June.

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