(a) Applicability. This section applies to the Intalco Aluminum Corporation (Intalco) primary aluminum plant located in Ferndale, Washington and to its successors and/or assignees.

(b) Better than BART Alternative—Sulfur dioxide (SO2) emission limit for potlines. Starting January 1, 2015, SO2 emissions from all potlines in aggregate must not exceed a total of 5,240 tons for any calendar year.

(c) Compliance demonstration.

(1) Intalco must determine on a calendar month basis, SO2 emissions using the following formula:

SO2 emissions in tons per calendar month = (carbon consumption ratio) × (% sulfur in baked anodes/100) × (% sulfur converted to SO2/100) × (2 pounds of SO2 per pound of sulfur) × (tons of aluminum production per calendar month)

(i) Carbon consumption 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 production records required in paragraph (e)(2) of this section.

(ii) % sulfur in baked anodes is the calendar month average sulfur content as determined in paragraph (d) of this section.

(iii) % sulfur converted to SO2 is 95%.

(2) Calendar year SO2 emissions shall be calculated by summing the 12 calendar month SO2 emissions for the calendar year.

(d) Emission monitoring.

(1) Intalco must determine the % sulfur of baked anodes using ASTM Method D6376 or an alternative method approved by the EPA Region 10.

(2) Intalco must collect at least four anode core samples during each calendar week.

(3) Calendar month average sulfur content shall be determined by averaging the sulfur content of all samples collected during the calendar month.

(e) Recordkeeping.

(1) Intalco must record the calendar month SO2 emissions and the calendar year SO2 emissions determined in paragraphs (c)(1) and (c)(2) of this section.

(2) Intalco must maintain records of the baked anode consumption and aluminum production data used to develop the carbon consumption ratio used in paragraph (c)(1)(i) of this section.

(3) Intalco must retain a copy of all calendar month carbon consumption ratio and potline SO2 emission calculations.

(4) Intalco must record the calendar month net production of aluminum and tons of aluminum produced each calendar month. Net production of aluminum is the total mass of molten metal produced from tapping all pots in all of the potlines that operated at any time in the calendar month, measured at the casthouse scales and the rod shop scales.

(5) Intalco must record the calendar month average sulfur content of the baked anodes.

(6) Records are to be retained at the facility for at least five years and be made available to the EPA Region 10 upon request.

(f) Reporting.

(1) Intalco must report the calendar month SO2 emissions and the calendar year SO2 emissions to the EPA Region 10 at the same time as the annual compliance certification required by the Part 70 operating permit for the Intalco facility is submitted to the Title V permitting authority.

(2) All documents and reports must be sent to the EPA Region 10 electronically, in a format approved by the EPA Region 10, to the following email address: [email protected]

[79 FR 33453, June 11, 2014]