By Walter F. Roche Jr.
Recent environmental tests at a Greene County chemical firm were conducted with the facility running at only 74 per cent of its designed capacity, according to state officials.
In a two-page letter sent Monday to US Nitrogen, a compliance manager at the Tennessee Department of Environment and Conservation said that the agency, nonetheless, concluded that the June 15 tests demonstrated compliance with the emission limits set forth in the company's operating permit.
The tests measured emissions of nitrous oxide and ammonia on the two ammonia production trains at the Midway ammonium nitrate manufacturing plant.
"The division recognizes that this production rate (74 per cent) was the highest achievable during the test period and acceptable for testing purposes," the letter from Bryan Parker states.
While the permit allows nitric acid production of 600 tons per day, the tests were conducted at the rate of 442 tons per day.
According to the letter the testing showed ammonia emissions of 1.19 pounds per hour while the permit limit is 3 pounds per hour or 5.19 tons per year.
The tests were performed June 15 by AMP Cherokee Environmental Solutions. Prior AMP Cherokee tests of US Nitrogen emissions conducted in April were deemed inconclusive.
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