U S Nitrogen Officials In Greeneville Are Seeking An Extension Deadline For Emissions Monitoring At The Nitric Acid Plant On Pottertown Road. The Current Deadline Is Set For April 29th. Company Officials Sent A Letter To The Tennessee Department Of Environment And Conservation Asking To Extend The Deadline To December 31st Due To Market Conditions, Equipment Limitations And Safety Considerations. Plant Officials Will Now Wait To Hear Back From State Environmental Officials.