SUMMARY N-REN CORP, SOUTHWEST DIV, OWNS/OPERATES AMMONIA AND AMMONIUM NITRATE PROD FAC, INCL NITRIC ACID PLNT. PRODUCTS ARE USED TO MANUFACTURE FERTILIZERS AND EXPLOSIVES AT OTH FAC. NITRIC ACID PLNT SUBJECT TO NSPS. REG 06 REQUESTS PNL TYS AND INJUNC UNDER SECT 113B FOR VIOL BY N-REN. N-REN EMISSIONS VIOL NSPS. N-REN HAS LONG HISTORY OF NOT ATTAINING/MAINTAINING COMPL W/NSPS. CO NOT ABLE TO MEET PERFORMANCE TEST UNTIL TWO YRS AFTER START UP. N-REN CLAIME D IT COULD NOT COMPLY DUE TO HIGH OPERATION COSTS AND WANTED STANDARDS RELAXED UNTIL IT COULD BRING ITS COSTS DOWN. EPA WOULD NOT GRNT EXEMPTION. CASES REFERRED ON 05/24/80 BUT CO CEASED OPERATION BEFORE CASE COULD BE FILED AND HAS OPERATED SPORADICALLY SINCE. COMPLAINT ALLEGES 1) N-REN OPERATED PLANT FROM 10/24/79 TO 6/18/82 WITHOUT OPERATING ALL AIR POLLUTION EQUIPMENT- VIOLATION OF SECT 111 (E), 42USC7411(E), AND 40CFR60.11(D). 2) N-REN DISCHARGED NITROGENOCIDES IN EXCESS OF NSPS RE- QUIREMENTS FROM 8/15/83 THROUGH 8/22/83-VIOLATIONS OF SECT 111(E), 42USC7411(E), AND 40CFR60.72(A)(1). 3) N-REN DID NOT CONDUCT CONTINOUS MONITORING SYSTEM PERFORMANCE EVOL- UTION ON OR BEFORE 9/11/79-VIALTION OF SECTIONS 111(E) AND 114, 42USC SECT 7411(E) AND 7414, AND 40CFR SECT 60.13AND 60.73.