(a) The requirements of section 169A of the Clean Air Act are not met, because the plan does not include approvable procedures for protection of visibility in mandatory Class I Federal areas.

(b) Regulation for visibility monitoring and new source review. The provisions of § 52.28 are hereby incorporated and made a part of the applicable plan for the State of Minnesota.

(c) [Reserved]

(d) The requirements of section 169A of the Clean Air Act are not met because the regional haze plan submitted by the state on December 30, 2009, and on May 8, 2012, does not meet the requirements of 40 CFR 51.308(e) with respect to NOX and SO2 emissions from United States Steel Corporation, Keetac of Keewatin, Minnesota; Hibbing taconite company of Hibbing, Minnesota; United States Steel Corporation, Minntac of Mountain Iron, Minnesota; United Taconite, LLC of Forbes, Minnesota; ArcelorMittal Minorca Mine, Inc. near Virginia, Minnesota; and Northshore Mining Company-Silver Bay of Silver Bay, Minnesota. The requirements for these facilities are satisfied by complying with the requirements of § 52.1235.

(e)(1) On and after the 30-boiler-operating-day period ending on September 30, 2015, the owners and operators of the facility at 13999 Industrial Boulevard in Becker, Sherburne County, Minnesota, shall not cause or permit the emission of SO2 from stack SV001 (serving Units 1 and 2) to exceed 0.050 lbs/MMBTU as a 30-day rolling average.

(2) On and after the 30-boiler-operating-day period ending on May 31, 2017, the owners and operators of the facility at 13999 Industrial Boulevard in Becker, Sherburne County, Minnesota, shall not cause or permit the emission of SO2 from Unit 3 to exceed 0.29 lbs/MMBTU as a 30-day rolling average.

(3) The owners and operators of the facility at 13999 Industrial Boulevard in Becker, Sherburne County, Minnesota, shall operate continuous SO2 emission monitoring systems in compliance with 40 CFR 75, and the data from this emission monitoring shall be used to determine compliance with the limits in this paragraph (e).

(4) For each boiler operating day, compliance with the 30-day average limitations in paragraphs (e)(1) and (e)(2) of this section shall be determined by summing total emissions in pounds for the period consisting of the day and the preceding 29 successive boiler operating days, summing total heat input in MMBTU for the same period, and computing the ratio of these sums in lbs/MMBTU. Boiler operating day is used to mean a 24-hour period between 12 midnight and the following midnight during which any fuel is combusted at any time in the steam-generating unit. It is not necessary for fuel to be combusted the entire 24-hour period. A boiler operating day with respect to the limitation in paragraph (e)(1) of this section shall be a day in which fuel is combusted in either Unit 1 or Unit 2. Bias adjustments provided for under 40 CFR 75 appendix A shall be applied. Substitute data provided for under 40 CFR 75 subpart D shall not be used.