40 CFR § 413.81
Specialized definitions
June 9, 2020
For the purpose of this subpart:
(a) The term sq ft (“sq m”) shall mean the area of the printed circuit board immersed in an aqueous process bath.
(b) The term operation shall mean any step in the printed circuit board manufacturing process in which the board is immersed in an aqueous process bath which is followed by a rinse.
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