Mobil has been granted five previous variances from the
ammonia nitrogen standard of Section 304.122 (old Rule 406,Chapter 3): (PCB 77—22, PCB 78—97, PCB 80—54, PCB 82—36 and PCB84—37.
Since 1973,
these efforts have reduced Mobil’s discharged ammoniaconcentration by 96 percent (Id).In 1973, Mobil’s discharge averaged 77 mg/l ammonianitrogen. at 2).Mobil contends that the ammonia...
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