…,” or “waste solidification.” [ 53 FR 4525 , Feb. 16, 1988, as amended at 55 FR 30656 , July 26, 1990; 62 FR 23891 , May 1, 1997; 71 FR 32474 , June 6, 2006; 73 FR 76960 , Dec. 18, 2008; 77 FR 23418 , Apr. 19, 2012; 87 FR 63955 , Oct. 21, 2022] § 372.5 Persons subject to this par…