§52.1235. Regional haze.

(1) Collection and reporting of data. The owner or operator of Keetac shall submit to EPA data collected when burning any fuel or combination of fuels other than exclusively natural gas during the period following installation of the NOX reduction technology until completion of 5,100 hours of data collection. Data shall be submitted to EPA no later than 30 days after completion of 5100 hours of data collection and in any case no later than November 8, 2030. The data shall include hourly NOX emissions recorded by CEMS in lbs NOX/MMBtu; hourly values of the operating parameters identified in paragraph (b)(1)(i)(C)(2) of this section; hourly process and CEMS information and codes; and hourly heat input in MMBtu by fuel type. EPA will consider the data submitted in accordance with the requirements of this paragraph and (b)(1)(i)(C)(3) of this section. Data collected during the first 720 hours burning fuel other than exclusively natural gas are considered the optimization period and shall be submitted to EPA but shall not be included in the 4380 hours of data considered for limit adjustment purposes. If the owner or operator wishes to exclude any data from consideration due to pellet quality concerns, then the owner or operator shall, to the extent applicable, submit to EPA information regarding the following factors: compression, reducibility, before tumble, after tumble, low temperature disintegration, clustering, and swelling. For each of the pellet quality analysis factors, the owner or operator must explain the pellet quality analysis factor, as well as the defined acceptable range for each factor using the applicable product quality standards based upon customers' pellet specifications that are contained in Keetac's ISO 9001 quality management system. The owner or operator shall also provide to EPA pellet quality analysis testing results that state the date and time of the analysis and, in order to define the time period when pellets were produced outside of the defined acceptable range for the pellet quality factors listed, include copies of the production logs that clearly define which hours of operation correspond to the production of the pellets tested, and document which hours produced pellets that met specifications and which hours produced pellets that failed to meet specifications. The owner or operator shall report all raw data in a format consistent with and able to be manipulated by Microsoft Excel including formulas, as appropriate, in each cell.

(2) Engineering report. No later than 30 days after completion of 5100 hours of data collection and in any case no later than November 8, 2030, the owner or operator of Keetac shall submit to EPA a final report including modeling demonstrating the selected NOX reduction technology is designed to achieve NOX emissions no greater than the emission limits specified in paragraph (b)(1)(i)(A)(2) of this section and identifying the operating parameters and set points upon which the modeling was based.

(3) Emission limit adjustment. If EPA determines that the data submitted in accordance with paragraph (b)(1)(i)(C)(1) of this section satisfy the criteria in that paragraph, then EPA shall use the applicable equation set forth in paragraph (f) of this section to determine whether adjustment of the emission limit set forth in paragraph (b)(1)(i)(A)(2) of this section is appropriate. If revised, the NOX emission limit when burning any fuel or combination of fuels other than exclusively natural gas may be no greater than 2.5 lbs NOX/MMBtu, based on a 720-hr rolling average. The data set used for the determination shall include only data that meet both pellet quality specifications and optimized operating parameters related to process and NOX reduction technology operation as identified in paragraph (b)(1)(i)(C)(2) of this section. If the data submitted pursuant to paragraph (b)(1)(i)(C)(1) of this section are normally distributed and statistically independent, EPA shall use the upper predictive limit (UPL) equation provided in paragraph (f)(1) of this section. If the data submitted pursuant to paragraph (b)(1)(i)(C)(1) of this section are not normally distributed or are normally distributed but not statistically independent, EPA shall use the non-parametric equation provided in paragraph (f)(2) of this section. If, after receiving complete data from the owner or operator as specified in (b)(1)(i)(C)(1) of this section, the results of the equation support an emission limit other than 2.0 lbs NOX/MMBtu when burning any fuel or combination of fuels other than exclusively natural gas, EPA shall initiate a rulemaking to adjust the emission limit. If the results of the equation do not support an adjustment of the 2.0 lbs NOX/MMBtu emission limit, then EPA shall take final agency action to notify the owner or operator of Keetac in writing. If the owner or operator does not submit data to EPA by January 8, 2031 in accordance with paragraph (b)(1)(i)(C)(1) of this section for burning any fuel or combination of fuels other than exclusively natural gas or if EPA determines that the owner or operator did not provide complete data supporting such an adjustment in accordance with paragraph (b)(1)(i)(C)(1) of this section, then the 2.0 lbs NOX/MMBtu emission limit shall remain in place and applicable.

Also, beginning 3 months from March 8, 2013, any coal burned at Minntac's Lines 3-7 shall have a sulfur content of 0.60 percent sulfur by weight or less based on a monthly block average. The sampling and calculation methodology for determining the sulfur content of fuel must be described in the monitoring plan required at paragraph (e)(8)(x) of this section.