Washington Administrative Code
Title 173 - Ecology, Department of (See also Titles 197, 317, 372, and 508)
Chapter 173-415 - Primary aluminum plants
Section 173-415-020 - Definitions

(1) "Ecology" means the department of ecology.

(2) "Potline" means a single discreet group of electrolytic reduction cells connected in series, in which alumina is reduced to form aluminum.

(3) "Primary aluminum reduction plant" means any facility manufacturing aluminum by electrolytic reduction. The primary aluminum reduction plant includes the following processes and their emission control systems: Pitch storage tanks, paste production plant, anode bake furnaces and potlines. For the purposes of this regulation, "primary aluminum reduction plant" is equivalent to "source."

(4) "Primary emission control system" means the equipment used to capture and remove the gases and particu-late matter evacuated directly from the reduction cell prior to discharge of the cleaned gas to the atmosphere.

(5) "Secondary emission control system" means the equipment used to collect and treat the gases and particu-late matter that escape from the reduction cells into the potroom prior to discharge of the cleaned gas to the atmosphere. Roof scrubbers are part of the secondary emission control system.

(6) "Total fluorides (TF)" means elemental fluorine and all fluoride compounds as measured by Methods 13A, 13B or 14A in 40 C.F.R. Part 60 Appendix A or by an EPA approved alternative method.