…0 [ 49 FR 8801 , Mar. 8, 1984; 49 FR 26739 , June 29, 1984, as amended at 49 FR 29795 , July 24, 1984] § 421.54 Standards of performance for new sources. Any new source subject to this subpart shall achieve the following new source performance standards: ( a ) Subpart E—Casting C…