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Piedmont Natural Gas issued the following statement as part of an upcoming project.

As a part of its ongoing work to provide safe, reliable natural gas service, Piedmont Natural Gas will perform routine infrastructure maintenance near 4053 River Road in Midland. The work is expected to happen March 19-27, barring weather events that may impact the project timetable.
These operations will include the use of a flare stack (a large vertical pipe), which could produce a loud noise and result in a tall flame being visible to nearby neighborhoods and businesses. People in the area also may notice a whistling sound or the smell of natural gas.
Flare stack operation is a controlled process that will be managed and monitored by Piedmont Natural Gas personnel in cooperation with local fire department resources.