EPA is proposing a requirement in 40 CFR 68.67(c)(9) for some Program 3 regulated processes to consider and document the feasibility of applying safer technologies and alternatives as part of their PHA. This requirement applies to petroleum and coal products manufacturing processes (classified in NAICS code 324) and chemical manufacturing processes (NAICS code 325) that are located within 1 mile of another RMP-regulated facility with these same processes (classified in NAICS 324 and 325). EPA is also proposing that all facilities with petroleum and coal products processes (in NAICS 324) using hydrofluoric acid (HF) in an alkylation unit (approximately 45 facilities) consider safer alternatives to HF alkylation, regardless of proximity to another NAICS 324- or 325-regulated facility.