## TABLE A: LIMITS AND OTHER REQUIREMENTS United Taconite LLC - Fairlane Plant 13700113 - 005 Facility Name: Permit Number: 08/19/10 A-4

Performance Testing: Conduct all performance tests in accordance with Minn. R. ch. 7017 unless otherwise noted in Tables A, B, and/or C. Minn. R. ch. 7017
Performance Test Notifications and Submittals: Performance Tests are due as outlined in Table A of the permit. See Table B for additional testing requirements. Performance Test Notification (written): due 30 days before each Performance Test Performance Test Plan: due 30 days before each Performance Test Performance Test Pre-test Meeting: due 7 days before each Performance Test Performance Test Report: due 45 days after each Performance Test Performance Test Report - Microfiche Copy: due 105 days after each Performance Test The Notification, Test Plan, and Test Report may be submitted in alternative format as allowed by Minn. R. 7017.2018. Minn. R. 7017.2018; Minn. R. 7017.2030, subps. 1-4, Minn. R. 7017.2035, subps. 1-2

Performance Tests: A) Performance testing for Line 1 (specifically, EU037-EU041 and the associated control equipment and stacks) shall be tested at a green ball feed rate of greater than or equal to 250 long tons per hour. B) Performance testing for Line 2 (specifically, EU033-EU036 and EU042 and the associated control equipment and stacks) shall be tested at a green ball feed rate of greater than or equal to 630 long tons per hour. C) All other emission units and their associated control equipment and stacks shall be tested at greater than or equal to 90% of the emission units rated capacity. If a performance test is conducted at less than the applicable minimum rate given above, the Permittee shall be given the opportunity to retest within 90 days of the subject test before process limits can be applied as specified in Minn. R. 7017.2025, subp. 3. Minn. R. 7017.2025

MONITORING REQUIREMENTS hdr Monitoring Equipment Installation: Install monitoring equipment for air pollution control devices within 180 days of permit issuance. (Monitoring equipment, if not already existing, must be installed within this time period to monitor surrogate parameters such as "Gas Stream Pressure Drop," "Water Flow Rate," and/or "Total Water Pressure," which are listed in Table A for specific Groups and Emission Units.) Minn. R. 7007.0800 subp. 4(D)

Monitoring Equipment Debugging, Troubleshooting, and Establishment of Parameter Ranges: Complete within 180 days of installation or of completion of needed repairs of all monitoring equipment. Minn. R. 7007.0800 subp. 4(D)

Monitoring Equipment Calibration: The Permittee shall calibrate all required monitoring equipment at least once every 12 months (any requirements applying to continuous emission monitors are listed separately in this permit). Minn. R. 7007.0800, subp. 4(D)

Operation of Monitoring Equipment: Unless otherwise noted in Tables A, B, and/or C, monitoring a process or control equipment connected to that process is not necessary during periods when the process is shutdown, or during checks of the monitoring systems, such as calibration checks and zero and span adjustments. If monitoring records are required, they should reflect any such periods of process shutdown or checks of the monitoring system. Minn. R. 7007.0800, subp. 4(D)

Changing operating parameters: Limits set as a result of a performance test (conducted before or after permit issuance) apply until superseded as stated in the MPCA's Notice of Compliance letter granting preliminary approval. Preliminary approval is based on formal review of a subsequent performance test on the same unit as specified by Minn. R. 7017.2025, subp. 3. The limit is final upon issuance of a permit amendment incorporating the change. Minn. R. 7017.2025, subp. 3

MERCURY REDUCTION REQUIREMENTS hdr (A) Applicable mercury requirements following issuance of Air Emission Permit No. 13700113-005 prior to receiving MPCA approval of an alternative mercury reduction plan. The following permit conditions apply prior to the MPCA's approval of alternative removal rates of scrubber solids to ensure no net increase of mercury emissions. hdr