Which of the following is not a sign of gas migration?

Landfill closure construction must include ______ and ______.

Landfill surface emissions require monitoring to meet regulatory requirements, even after closure.

The first layer of waste above the liner and leachate collection system shall be a minimum of five feet compacted thickness.

______ may need to be added to landfill gas in order to burn it if hydrogen sulfide concentration is insufficient to support combustion.

Geosynthetic Clay Liners (GCLs) will be ruined if ______.

Biological Leachate Treatment normally involves adding air to leachate ponds/tanks to promote an increase in ______.

Groundwater at or near land surface must be protected from leachate resulting from contact with solid waste.

Which of the following does RCRA Subtitle D regulations and requirements for landfill closure not include?

If existing soils are likely to settle, the existing soil makes do not need to be improved.