§ 52.2502 Best available retrofit technology requirements for the Alcoa Inc.—Wenatchee Works primary aluminum smelter.
(a) Applicability. This section applies to the Alcoa Inc.—Wenatchee Works primary aluminum smelter (Wenatchee Works) located near Wenatchee, Washington and to its successors and/or assignees.
(b) Best available retrofit technology (BART) emission limitations for Potline 5—(1) Sulfur dioxide (SO2) emission limit. Starting November 10, 2014, SO2 emissions from Potline 5 must not exceed 46 pounds per ton of aluminum produced during any calendar month as calculated in paragraph (b)(1)(i) of this section.
(i) Compliance demonstration. Alcoa must determine SO2 emissions, on a calendar month basis using the following formulas:
(A) The carbon ratio is the calendar month average of tons of baked anodes consumed per ton of aluminum produced as determined using the baked anode consumption and aluminum production records required in paragraph (h)(2) of this section.
(B) The % sulfur in baked anodes is the calendar month average sulfur content as determined in paragraph (b)(1)(ii) of this section.
(C) The % sulfur converted to SO2 is 90%.
(ii) Emission monitoring. The % sulfur of baked anodes must be determined using ASTM Method D6376 or an alternative method approved by the EPA Region 10.
(A) At a minimum, Alcoa must collect no less than four baked anode core samples during each calendar week.
(B) Calendar month average sulfur content must be determined by averaging the sulfur content of all samples collected during the calendar month.
(2) Particulate matter (PM) emission limit. Starting November 10, 2014, PM emissions from the Potline 5 Gas Treatment Center stack must not exceed 0.005 grains per dry standard cubic foot of exhaust gas.
(3) Nitrogen oxides(NOX) emission limit. Starting January 7, 2015, NOX emissions from Potline 5 must not exceed, in tons per calendar month, the emission limit determined under paragraph (b)(3)(iii) of this section.