## TABLE A: LIMITS AND OTHER REQUIREMENTS United Taconite LLC - Fairlane Plant 13700113 - 005 Facility Name: Permit Number: 08/19/10 A-51

Sulfuric Acid Mist Calculation and Recordkeeping - Rolling Average. The Permittee shall calculate and record the daily tons of sulfuric acid mist emissions and the 30-day rolling sum sulfuric acid mist emissions from EU 040 (SV 046 and SV 097) each day. All sulfuric acid mist emissions from EU 040 shall be included in these calculations. Prior to certification of MR 002 and MR 003, sulfuric acid mist emissions shall be determined according to the calculation methods used in the permit application for A ir Emission Permit No. 13700113-005. These methods are found in the BAE.xls (Excel) spreadsheet, tab [Table 3 SO2-SAM]. After certification of MR 002 and MR 003, emissions from EU 040/SV 046 will be determined from MR 002 and MR 003 as described in Appendix E. Title I Condition: Recordkeeping associated with a limit taken to avoid classification as a major modification under 40 CFR Section 52.21 and Minn. R. 7007.3000; Minn. R. 7007.0800, subp. 4 & 5

Recordkeeping. Maintain records of the occurrence and duration of any startup, shutdown, or malfunction of EU 040 including any malfunction of the air pollution control equipment; or any periods during which a continuous monitoring system or monitoring device is inoperative. Minn. R. 7007.0800, subp. 4 & 5

Recordkeeping. Maintain a file of all measurements, maintenance, reports and records for at least five years. Minn. R. 7007.0800, subp. 4 & 5

The Permittee shall monitor and record the type and quantity of each fuel entering the furnace each hour in a form that enables the Permittee to convert the data to the heat input (BTU) of each fuel type (solid, liquid, or gas) on an hourly basis. Title I Condition: Monitoring associated with a limit taken to avoid classification as a major modification under 40 CFR Section 52.21 and Minn. R. 7007.3000; Minn. R. 7007.0800, subp. 2; Minn. R. 7007.0800, subp. 4(B) Fuel Sampling: The Permittee shall collect a solid fuel sample each weekday from the pulverized fuel pipe. The Permittee shall form a weekly composite of all samples collected in a given calendar week. Minn. R. 7007.0800, subp. 2; Minn. R. 7007.0800, subp. 4(B) Prior to the installation and certification of a continuous emissions monitor system (CEMS) for SO2 for EU 040, the Permittee shall comply with the following conditions: Fuel Sulfur and BTU Content Monitoring: The Permittee shall analyze the weekly fuel composite samples for sulfur content in weight percent and heating value in BTU per pound, in accordance with current ASTM Methods. Sulfur Dioxide Emissions Calculation: Within 21 days after the end of a calendar week, the Permittee shall calculate the SO2 emissions rate in lbs/MMBtu from the results of the weekly fuel composite analysis, and the Sulfur Dioxide control efficiency of 25 percent or the value directly determined by recent performance testing - whichever is lower in value. The Permittee shall maintain a record of the analysis, calculations, and emission rate. Minn. R. 7007.0800, subp. 2 and Minn. R. 7007.0800, subp. 4(B)

Beginning with the certification of a continuous emissions monitoring system (CEMS) for SO2 for EU 040, the Permittee shall comply with the following conditions: Fuel BTU Content Monitoring: The Permittee shall analyze the weekly fuel composite samples for heating value in BTU per pound, in accordance with current ASTM Methods. Sulfur Dioxide Emissions Calculation (lb/MMBtu): Within 21 days after the end of a calendar week, the Permittee shall calculate and record the SO2 emissions rate in lbs/MMBtu for each 3-hour rolling period from the calendar week using the results of the weekly fuel composite analysis and stack CEM measurements.
The Permittee shall also calculate and record the emission limit for each 3-hour rolling period during the calendar week from the records of fuel inputs and fuel energy content. The Permittee shall maintain a record of the analysis, calculations, emission limit, and emission rate. Minn. R. 7007.0800, subp. 2 and Minn. R. 7007.0800, subp. 4(B)

CONTROL EQUIPMENT MONITORING hdr The Permittee shall operate and maintain the scrubber (CE 056) at any time that the process equipment controlled by the scrubber (EU 040) is in operation. The Permittee shall record periods of non-operation of the control equipment. Title I Condition: To avoid classification as a major modification under 40 CFR Section 52.21 and Minn. R. 7007.3000; Minn. R. 7011.0075, subp. 1

## TABLE A: LIMITS AND OTHER REQUIREMENTS United Taconite LLC - Fairlane Plant 13700113 - 005 Facility Name: Permit Number: 08/19/10 A-58

Recordkeeping. Maintain a file of all measurements, maintenance, reports and records for at least five years. Minn. R. 7007.0800, subp. 4 & 5

The Permittee shall monitor and record the type and quantity of each fuel entering the furnace each hour in a form that enables the Permittee to convert the data to the heat input (BTU) of each fuel type (solid, liquid, or gas) on an hourly basis. Title I Condition: Recordkeeping associated with a limit taken to avoid classification as a major modification under 40 CFR Section 52.21 and Minn. R. 7007.3000; Minn. R. 7007.0800, subp. 2; Minn. R. 7007.0800, subp. 4(B) Fuel Sampling: The Permittee shall collect a solid fuel sample each weekday from the pulverized fuel pipe. The Permittee shall form a weekly composite of all samples collected in a given calendar week. Minn. R. 7007.0800, subp. 2; Minn. R. 7007.0800, subp. 4(B) Prior to the installation and certification of a continuous emissions monitor systems (CEMS) for SO2 for EU 042, the Permittee shall comply with the following conditions: Fuel Sulfur and BTU Content Monitoring: The Permittee shall analyze the weekly fuel composite samples for sulfur content in weight percent and heating value in BTU per pound, in accordance with current ASTM Methods. Sulfur Dioxide Emissions Calculation: Within 21 days after the end of a calendar week, the Permittee shall calculate the SO2 emissions rate in lbs/MMBtu from the results of the weekly fuel composite analysis, and the Sulfur Dioxide control efficiency of 25 percent or the value directly determined by recent performance testing - whichever is lower in value. The Permittee shall maintain a record of the analysis, calculations, and emission rate. Minn. R. 7007.0800, subp. 2 and Minn. R. 7007.0800, subp. 4(B)

Beginning upon certification of a continuous emissions monitoring systems (CEMS) for SO2 for EU 042, the Permittee shall comply with the following conditions: Fuel BTU Content Monitoring: The Permittee shall analyze the weekly fuel composite samples for heating value in BTU per pound, in accordance with current ASTM Methods. Sulfur Dioxide Emissions Calculation (lb/MMBtu): Within 21 days after the end of a calendar week, the Permittee shall calculate and record the SO2 emissions rate in lbs/MMBtu for each 3-hour rolling period from the calendar week using the results of the weekly fuel composite analysis and stack CEM measurements.
The Permittee shall shall also calculate and record the emission limit for each 3-hour rolling period during the calendar week from the records of fuel inputs and fuel energy content. The Permittee shall maintain a record of the analysis, calculations, emission limit, and emission rate. Minn. R. 7007.0800, subp. 2 and Minn. R. 7007.0800, subp. 4(B)

CONTROL EQUIPMENT MONITORING hdr Process Monitoring: Check stack visible emissions (opacity) once daily using a checklist in Appendix B. Minn. R. 7007.0800, subp. 4(B); Minn. R. 7007.0800, subp. 14; Minn. R. 7007.0800, subp. 16(J) The Permittee shall operate and maintain the scrubbers for EU 042 (CE 049 and CE 050) at any time that the process equipment controlled by the scrubber (EU 042) is in operation. The Permittee shall record periods of non-operation of the control equipment. Title I Condition: To avoid classification as a major modification under 40 CFR Section 52.21 and Minn. R. 7007.3000; Minn. R. 7011.0075, subp. 1 Corrective Actions: The Permittee shall take corrective action as soon as possible if any of the following occur: - the recorded water flow rate is outside the required operating range; or - the recorded pressure drop is outside the required operating range; or - the scrubber or any of its components are found during the inspections to need repair. Corrective actions shall return the pressure drop and/or water flow rate to within the permitted range, and/or include completion of necessary repairs identified during the inspection, as applicable. Corrective actions include, but are not limited to, those outlined in the O & M Plan for the scrubber. The Permittee shall keep a record of the type and date of any corrective action taken for the scrubber. Minn. R. 7007.0800, subps. 4, 5, and 14

Gas Stream Pressure Drop: Monitor and record the daily average pressure drop across each control device (CE 049 and CE 050). Minn. R. 7007.0800, subp. 4(D); Minn. R. 7007.0800, subp. 14; Minn. R. 7007.0800, subp. 16(J) Total Water Flow: Monitor and record when in operation the daily average scrubber water flow rate across each control device (CE 049 and CE 050). Minn. R. 7007.0800, subp. 4(D); Minn. R. 7007.0800, subp. 14; Minn. R. 7007.0800, subp. 16(J)