(a) This subpart applies to process wastewater directly discharged from facilities specified at Sec. 438.1.
(b) This subpart applies to process wastewater discharges from oily operations (as defined at Sec. 438.2(f) and appendix B of this part).
(c) This subpart does not apply to process wastewater discharges from metal-bearing operations (as defined at Sec. 438.2(d) and appendix C of this part).