AIR EMISSION PERMIT NO IS ISSUED TO. 3MCo

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1 AIR EMISSION PERMIT NO IS ISSUED TO 3MCo 3M - Cottage Grove Corporate Incinerator Innovation Road Cottage Grove, Washington County, MN The emission units, control equipment and emission stacks at the stationary source authorized in this permit are as described in the following permit application(s): Issue Date See Below Action 002 This permit amendment supersedes Air Emission Permit No and authorizes the Permittee to operate the stationary source at the address listed above unless otherwise noted in Table A. The Permittee must comply with all the conditions of the permit. Any changes or modifications to the stationary source must be performed in compliance with Minn. R to Terms used in the permit are as defined in the state air pollution control rules unless the term is explicitly defined in the permit. Permit Type:. Issuance Date: Expiration: Federal; Part 70/Limits to Avoid NSR June 28, 2012 June 28, 2017 Title I Conditions do not expire. Sc;::,S,y..;L Don Smith, P.E., Manager Air Quality Permits Section Industrial Division for John Line Stine Commissioner Minnesota Pollution Control Agency TDD (for hearing and speech impaired only): Printed on recycled paper containing at least 10% fibers from paper recycled by consumers

2 TABLE OF CONTENTS Notice to the Permittee Permit Shield Facility Description Amendment Description Table A: Limits and Other Requirements Table B: Submittals Appendices Appendix A: Table 1 to Subpart EEE of Part 63 General Provisions Applicable to Subpart EEE Appendix B: Table 2 to Subpart DD of Part 63 General Provisions Applicable to Subpart DD Appendix C: Insignificant Activities and General Applicable Requirements

3 NOTICE TO THE PERMITTEE: Your stationary source may be subject to the requirements of the Minnesota Pollution Control Agency s (MPCA) solid waste, hazardous waste, and water quality programs. If you wish to obtain information on these programs, including information on obtaining any required permits, please contact the MPCA general information number at: Metro Area Outside Metro Area TTY The rules governing these programs are contained in Minn. R. chs Written questions may be sent to: Minnesota Pollution Control Agency, 520 Lafayette Road North, St. Paul, Minnesota Questions about this air emission permit or about air quality requirements can also be directed to the telephone numbers and address listed above. PERMIT SHIELD: Subject to the limitations in Minn. R , compliance with the conditions of this permit shall be deemed compliance with the specific provision of the applicable requirement identified in the permit as the basis of each condition. Subject to the limitations of Minn. R and , subp. 2, notwithstanding the conditions of this permit specifying compliance practices for applicable requirements, any person (including the Permittee) may also use other credible evidence to establish compliance or noncompliance with applicable requirements. FACILITY DESCRIPTION: The 3M Company (Permittee) Cottage Grove Center (Facility) is located at Innovation Road, Cottage Grove, Minnesota. 3M has operated the thermal treatment system under a combined air quality and hazardous waste permit. For purposes of simplifying the permit situation, this permit is an air permit only. The facility also has a separate RCRA hazardous waste permit. The 3M Corporate Incinerator provides treatment and storage of hazardous waste generated by 3M s operating divisions throughout North America, non-3m waste with high BTU value as defined in Part II.B.2. of the hazardous waste permit, and wastes from Minnesota law enforcement agencies as defined in Part II.B.3. of the hazardous waste permit for the facility. The Incineration system is designed to handle a variety of wastes introduced through four separate feed systems. Materials can be fed to the rotary kiln by four means depending on the waste stream. Solids are fed through a bulk feed chute (pakfeeder and Komar shredder); pumpable liquids are fed through lances or the frontwall burner; sludge is fed through a lance from either the Building 145 sludge room or the Building 47 pump room; and direct burn wastes are fed through a lance. The system consists of a rotary kiln and a secondary combustion chamber (SCC) followed by a wet off-gas cleaning system. The off-gas cleaning system consists of a quench chamber, a subcooler, a particulate removal device known as the M1 module, a wet electrostatic precipitator (WESP), an induced draft fan, and an exhaust stack.

4 Hazardous waste is shipped to the Facility via semi-trailers in 55-gallon steel drums, totes, plastic and fiber drums, pails, boxes, bags, portable tanks, and tanker trucks. The types of containerized wastes received include solids, gases in cylinders, pumpable sludges, organic liquids, and aqueous liquids. Located at this Facility are indoor and outdoor container storage areas, outdoor tank storage areas, a containment building for bulk solids storage, a tanker truck unloading area, outdoor trailer storage, indoor and outdoor material handling areas, and a rotary kiln incinerator with a secondary combustion chamber. These units provide treatment and storage of hazardous waste generated by 3M s operating divisions. No disposal of hazardous waste is conducted at this Facility. This permit authorizes the operation of the combustion system consisting of a rotary kiln and a secondary combustion chamber. The rotary kiln is 40 feet long, has a shell diameter of 14 feet 9 inches, and is designed as a primary combustion chamber. The SCC is 60 feet high and has a shell diameter of 20 feet. It provides additional residence time to combust off-gases of organic wastes. The SCC burners have been removed, and the burner inlets are welded shut welded shut, which has reduced the overall capacity of the incinerator. An emergency vent stack is provided at the roof of the secondary combustion chamber. The combustion system has no boiler. This permit does not authorize the installation of a future boiler. Pollution control is facilitated with several flue gas treatment devices. The incinerator exhaust gases are saturated and cooled in the quench chamber. Flue gases then pass through a subcooling tower and filtering module. Final pollution control is provided by a wet electrostatic precipitator. Flue gases are pulled through the system with an induced draft fan and exhausted through a 165- foot stack to the atmosphere. AMENDMENT DESCRIPTION: This permit amendment is a reissuance of the operating permit, and a major amendment to allow additional sources of non-3m hazardous waste for incineration in the kiln. The additional outside sources will include high Btu waste or wastes from Minnesota law-enforcement agencies as defined in Part II.B.2. and Part II.B.3. of the hazardous waste permit for the facility.

5 TABLE A: LIMITS AND OTHER REQUIREMENTS Facility Name: 3M - Cottage Grove Corporate Incinerator Permit Number: A-1 06/28/12 Table A contains limits and other requirements with which your facility must comply. The limits are located in the first column of the table (What To do). The limits can be emission limits or operational limits. This column also contains the actions that you must take and the records you must keep to show that you are complying with the limits. The second column of Table A (Why to do it) lists the regulatory basis for these limits. Appendices included as conditions of your permit are listed in Table A under total facility requirements. Subject Item: Total Facility What to do SOURCE-SPECIFIC REQUIREMENTS The facility currently manages ozone-depleting substances as defined in 40 CFR pt. 82. Sections of the 1990 Clean Air Act Amendments and 40 CFR pt. 82 may apply to your facility. Read Sections and 40 CFR pt. 82 to determine all the requirements that apply to your facility. OPERATIONAL REQUIREMENTS The Permittee shall comply with National Primary and Secondary Ambient Air Quality Standards, 40 CFR pt. 50, and the Minnesota Ambient Air Quality Standards, Minn. R to Compliance shall be demonstrated upon written request by the MPCA. Permit Appendices: This permit contains appendices as listed in the Table of Contents. The Permittee shall comply with all requirements contained in the appendices. Circumvention: Do not install or use a device or means that conceals or dilutes emissions, which would otherwise violate a federal or state air pollution control rule, without reducing the total amount of pollutant emitted. Air Pollution Control Equipment: Operate all pollution control equipment whenever the corresponding process equipment and emission units are operated. Operation and Maintenance (O&M) Plan: Retain at the stationary source an O&M plan for all air pollution control equipment. At a minimum, the O&M plan shall identify all air pollution control equipment and control practices and shall include a preventative maintenance program for the equipment and practices, a description of (the minimum but not necessarily the only) corrective actions to be taken to restore the equipment and practices to proper operation to meet applicable permit conditions, a description of the employee training program for proper operation and maintenance of the control equipment and practices, and the records kept to demonstrate plan implementation. Operation Changes: In any shutdown, breakdown, or deviation the Permittee shall immediately take all practical steps to modify operations to reduce the emission of any regulated air pollutant. The Commissioner may require feasible and practical modifications in the operation to reduce emissions of air pollutants. No emissions units that have an unreasonable shutdown or breakdown frequency of process or control equipment shall be permitted to operate. Fugitive Emissions: Do not cause or permit the handling, use, transporting, or storage of any material in a manner which may allow avoidable amounts of particulate matter to become airborne. Comply with all other requirements listed in Minn. R Noise: The Permittee shall comply with the noise standards set forth in Minn. R to at all times during the operation of any emission units. This is a state only requirement and is not enforceable by the EPA Administrator or citizens under the Clean Air Act. Inspections: The Permittee shall comply with the inspection procedures and requirements as found in Minn. R , subp. 9(A). The Permittee shall comply with the General Conditions listed in Minn. R , subp. 16. MONITORING REQUIREMENTS Monitoring Equipment Calibration: Annually calibrate all required monitoring equipment, not to exceed 12 months from the previous calibration. Operation of Monitoring Equipment: Unless otherwise noted in Table A, 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. hdr 40 CFR pt. 82 hdr Why to do it 40 CFR pt. 50; Minn. Stat. Section , subds. 4a & 9; Minn. R , subp. 7(A), 7(L), & 7(M); Minn. R , subps. 1, 2 & 4; Minn. R Minn. R , subp. 2 Minn. R Minn. R , subps. 2 & 16(J); 40 CFR 64.7 Minn. R , subps. 14 & 16(J) Minn. R , subp. 4 Minn. R Minn. R Minn. R , subp. 9(A) Minn. R , subp. 16 hdr Minn. R , subp. 4(D); 40 CFR 64.7 Minn. R , subp. 4(D); 40 CFR 64.7

6 TABLE A: LIMITS AND OTHER REQUIREMENTS Facility Name: 3M - Cottage Grove Corporate Incinerator Permit Number: A-2 06/28/12 PERFORMANCE TESTING Performance Testing: Conduct all performance tests in accordance with Minn. R. ch unless otherwise noted in Table A. Performance Test Notifications and Submittals: Performance Tests are due as outlined in Table A of the permit. hdr Minn. R. ch Minn. R ; Minn. R , subps. 1-4; Minn. R , subps. 1-2 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 - CD 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 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 , subp. 3. The limit is final upon issuance of a permit amendment incorporating the change. If a new limit is required to be set, it shall be based on the average of the test run averages during the stack test, unless otherwise specified in an applicable requirement. RECORDKEEPING Recordkeeping: Retain all records at the stationary source for a period of five (5) years from the date of monitoring, sample, measurement, or report. Records which must be retained at this location include all calibration and maintenance records, all original recordings for continuous monitoring instrumentation, and copies of all reports required by the permit. Records must conform to the requirements listed in Minn. R , subp. 5(A). Recordkeeping: Maintain records describing any insignificant modifications (as required by Minn. R , subp. 3) or changes contravening permit terms (as required by Minn. R , subp. 2), including records of the emissions resulting from those changes. If the Permittee determines that no permit amendment or notification is required prior to making a change, the Permittee must retain records of all calculations required under Minn. R These records shall be kept for a period of five years from the date the change was made or until permit reissuance, whichever is longer. The records shall be kept at the stationary source for the current calendar year of operation and may be kept at the office of the stationary source for all other years. The records may be maintained in either electronic or paper format. REPORTING/SUBMITTALS Shutdown Notifications: Notify the Commissioner at least 24 hours in advance of a planned shutdown of any control equipment or process equipment if the shutdown would cause any increase in the emissions of any regulated air pollutant. If the Permittee does not have advance knowledge of the shutdown, notification shall be made to the Commissioner as soon as possible after the shutdown. However, notification is not required in the circumstances outlined in Items A, B and C of Minn. R , subp. 3. At the time of notification, the owner or operator shall inform the Commissioner of the cause of the shutdown and the estimated duration. The owner or operator shall notify the Commissioner when the shutdown is over. Breakdown Notifications: Notify the Commissioner within 24 hours of a breakdown of more than one hour duration of any control equipment or process equipment if the breakdown causes any increase in the emissions of any regulated air pollutant. The 24-hour time period starts when the breakdown was discovered or reasonably should have been discovered by the Permittee. However, notification is not required in the circumstances outlined in Items A, B and C of Minn. R , subp. 2. Minn. R hdr Minn. R , subp. 5(C) Minn. R , subp. 5(B) Minn. R , subp. 4 hdr Minn. R , subp. 3 Minn. R , subp. 2 At the time of notification or as soon as possible thereafter, the owner or operator shall inform the Commissioner of the cause of the breakdown and the estimated duration. The owner or operator shall notify the Commissioner when the breakdown is over.

7 TABLE A: LIMITS AND OTHER REQUIREMENTS Facility Name: Permit Number: 3M - Cottage Grove Corporate Incinerator Notification of Deviations Endangering Human Health or the Environment: As soon as possible after discovery, notify the Commissioner or the state duty officer, either orally or by facsimile, of any deviation from permit conditions which could endanger human health or the environment. Notification of Deviations Endangering Human Health or the Environment Report: Within 2 working days of discovery, notify the Commissioner in writing of any deviation from permit conditions which could endanger human health or the environment. Include the following information in this written description: 1. The cause of the deviation; 2. The exact dates of the period of the deviation, if the deviation has been corrected; 3. Whether or not the deviation has been corrected; 4. The anticipated time by which the deviation is expected to be corrected, if not yet corrected; and 5. Steps taken or planned to reduce, eliminate, and prevent reoccurrence of the deviation. Application for Permit Amendment: If a permit amendment is needed, submit an application in accordance with the requirements of Minn. R Submittal dates vary, depending on the type of amendment needed. Extension Requests: The Permittee may apply for an Administrative Amendment to extend a deadline in a permit by no more than 120 days, provided the proposed deadline extension meets the requirements of Minn. R , subp. 1(H). Emission Inventory Report: due on or before April 1 of each calendar year following permit issuance, to be submitted on a form approved by the Commissioner. Minn. R , subp. 1; Minn. Stat. Section Minn. R , subp. 1 Minn. R Minn. R , subp. 1(H) Minn. R Emission Fees: due 60 days after receipt of an MPCA bill. Minn. R The Permittee shall submit a Part 1 MACT application within 30 days of startup of any 112(j) affected source. The application shall meet the requirements of 40 CFR Section 63.53(a). The Permittee shall submit a Part 2 MACT application within 90 days of startup of any 112(j) affected source. The application shall meet the requirements of 40 CFR Section 63.53(b). 112(j) affected source is defined in 40 CFR Section As of permit issuance, 112(j) affected sources include industrial, commercial, and institutional boilers and process heaters; brick and structural clay products manufacturing; and clay ceramics manufacturing. 40 CFR 63.52(b)(1) & (e)(1) A-3 06/28/12

8 TABLE A: LIMITS AND OTHER REQUIREMENTS Facility Name: 3M - Cottage Grove Corporate Incinerator Permit Number: A-4 06/28/12 Subject Item: Associated Items: GP 001 Equipment Leaks Subject to Subpart V - National Emission Standards for Equipment Leaks EU 003 Waste Handling Via Sludge Pump EU 012 Flanges, Piping and Valves-Kiln Burner Trains What to do The Permittee shall demonstrate compliance with the standards of Subpart V for each new and existing source as required in 40 CFR 61.05, except as provided in 40 CFR and Compliance with subpart V will be determined by review of records, review of performance test results, and inspection using the methods and procedures specified in 40 CFR The Permittee may request a determination of alternative means of emission limitation to the requirements of 40 CFR , , , , , , and as provided in 40 CFR If the Administrator makes a determination that a means of emission limitation is at least a permissible alternative to the above requirements, the Permittee shall comply with the requirements of that determination. Each piece of equipment to which subpart V applies shall be marked in such a manner that it can be distinquished readily from other pieces of equipment. Equipment that is in vacuum service is excluded from the standards of this subpart if it is identified as required in 40 CFR (e)(5). STANDARDS: -- PUMPS Each pump shall be monitored monthly to detect leaks by the methods specified in the Test Methods of this subpart, except as provided in 40 CFR (c) and 40 CFR (d)-(g). Each pump shall be checked by visual inspection each calendar week for indications of liquids dripping from the pump seal. Leak Detection - A leak is detected when: - An instrument reading of 10,000 ppm or greater is measured; or - If there are indications of liquids dripping from the pump seal. Leak Detection - Repairs: - When a leak is detected, it shall be repaired as soon as practicable, but not later than 15 calendar days after it is detected, except as provided by the Delay of Repair standard. - A first attempt at repair shall be made no later than 5 calendar days after each leak is detected. Each pump equipped with a dual mechanical seal system that includes a barrier fluid system is exempt from the requirements of 40 CFR (a)-(b), provided the following requirements are met. 1. Each dual mechanical seal system is: - Operated with the barrier fluid at a pressure that is at all times greater than the pump stuffing box pressure; or - Equipped with a barrier fluid degassing reservoir that is routed to a process or fuel gas system; or - Equipped with a system that purges the barrier fluid into a process stream with zero VHAP emissions to atmosphere. 2. The barrier fluid is not in VHAP service and, if the pump is covered by standards under 40 CFR part 60, is not in VOC service. 3. Each barrier fluid system is equipped with a sensor that will detect failure of the seal system, the barrier fluid system, or both. 4. Each pump is checked by visual inspection each calendar week for indications of liquids dripping from the pump seal. - If there are indications of liquid dripping from the pump seal at the time of the weekly inspection, the pump shall be monitored to determine the presence of VOC and VHAP in the barrier fluid as specified by the Test Methods. - If the monitor reading (taking into account any background readings) indicates the presence of VHAP, a leak is detected. For the purpose of this paragraph, the monitor may be calibrated with VHAP, or may employ a gas chromatography column to limit the response of the monitor to VHAP, at the option of the Permittee. - If an instrument reading of 10,000 ppm or greater (total VOC) is measured, a leak is detected. 5. Each sensor, as described in 3. above, is checked daily or is equipped with an audible alarm. Why to do it 40 CFR (b)(1); 40 CFR (a); 40 CFR (b); 40 CFR (c) 40 CFR (d); 40 CFR (e); 40 CFR CFR (a); 40 CFR (b); 40 CFR (c); 40 CFR (d);

9 TABLE A: LIMITS AND OTHER REQUIREMENTS Facility Name: 3M - Cottage Grove Corporate Incinerator Permit Number: A-5 06/28/12 6. The Permittee determines, based on design considerations and operating experience, criteria applicable to the presence and frequency of drips and to the sensor that indicates failure of the seal system, the barrier fluid system, or both. - If indications of liquids dripping from the pump seal exceed the criteria established above, or if, based on the criteria established above, the sensor indicates failure of the seal system, the barrier fluid system, or both, a leak is detected. - When a leak is detected, it shall be repaired as soon as practicable, but no later than 15 calendar days after it is detected, except as provided by the Delay of Repair standard. - A first attempt at repair shall be made no later than 5 calendar days after each leak is detected. Any pump that is designated, as described in section 246(e)(2), for no detectable emissions, as indicated by an instrument reading of < 500 ppm above background, is exempt from the requirements of sections 242-2(a), (c) & (d) if the pump: - Has no externally actuated shaft penetrating the pump housing; - Is demonstrated to be operating with no detectable emissions, as indicated by an instrument reading of < 500 ppm above background, as measured by the method specified in paragraph (c) of the Test Methods; and - Is tested for compliance with these emissions initially upon designation, annually, and at other times requested by the Administrator. If any pump is equipped with a closed-vent system capable of capturing and transporting any leakage from the seal or seals to a process or fuel gas system, it is exempt from the requirements of 40 CFR (a)-(e). Any pump that is designated, as described in section 246(f)(1), as an unsafe-tomonitor pump is exempt from the monitoring and inspection requirements of 40 CFR (a) and (d)(4)-(6) if the Permittee: - Demonstrates that the pump is unsafe-to-monitor because monitoring personnel would be exposed to an immediate danger as a consequence of complying with 40 CFR (a); and - Has a written plan that requires monitoring of the pump as frequently as practicable during safe-to-monitor times but not more frequently than the periodic monitoring schedule otherwise applicable, and repair of the equipment according to the procedures in 40 CFR (c) if a leak is detected. Any pump that is located within the boundary of an unmanned plant site is exempt from the weekly visual inspection requirement of 40 CFR (a)(2) and (d)(4), and the daily requirements of 40 CFR (d)(5), provided that each pump is visually inspected as often as practicable and at least monthly. STANDARDS: -- PRESSURE RELIEF DEVICES IN GAS/VAPOR SERVICE Except during pressure releases, each pressure relief device in gas/vapor service shall be operated with no detectable emissions, as indicated by an instrument reading of less than 500 ppm above background, as measured by the method specified in paragraph (c) of the Test Methods. After each pressure release, the pressure relief device shall be returned to a condition of no detectable emissions, as indicated by an instrument reading of less than 500 ppm above background, as soon as practicable, but no later than 5 calendar days after each pressure release, except as provided by the Delay of Repair standard. No later than 5 calendar days after the pressure release, the pressure relief device shall be monitored to confirm the condition of no detectable emissions, as indicated by an instrument reading of less than 500 ppm above background, as measured by the method specified in paragraph (c) of the Test Methods. Any pressure relief device that is routed to a process or fuel gas system or equipped with a closed-vent system capable of capturing and transporting leakage from the pressure relief device to a control device as described in 40 CFR is exempt from the requirements of 40 CFR (a)-(b). Any pressure relief device that is equipped with a rupture disk upstream of the pressure relief device is exempt from the requirements of 40 CFR (a)-(b), provided the Permittee complies with the following requirement: - After each pressure release, a new rupture disk shall be installed upstream of the pressure relief device as soon as practicable, but no later than 5 calendar days after each pressure release, except as provided in the Delay or Repair standard. STANDARDS: -- SAMPLING CONNECTING SYSTEMS 40 CFR (e); 40 CFR (f); 40 CFR (g); 40 CFR (h); 40 CFR CFR (a); 40 CFR (b); 40 CFR (c); 40 CFR (d); 40 CFR

10 TABLE A: LIMITS AND OTHER REQUIREMENTS Facility Name: 3M - Cottage Grove Corporate Incinerator Permit Number: A-6 06/28/12 Each sampling connection system shall be equipped with a closed-purge, closedloop, or closed vent system, except as provided in 40 CFR (c). Gases displaced during filling of the sample container are not required to be collected or captured. Each closed-purge, closed-loop, or closed vent system as required above shall comply with the following requirements: 1. Return the purged process fluid directly to the process line; or 2. Collect and recycle the purged process fluid; or 3. Be designed and operated to capture and transport all the purged process fluid to a control device that complies with the requirements of 40 CFR ; or 4. Collect, store, and transport the purged process fluid to any of the following systems or facilities: - A waste management unit as defined in 40 CFR if the waste management unit is subject to and operated in compliance with the provisions of 40 CFR part 63, subpart G, applicable to Group 1 wastewater streams; or - A treatment, storage, or disposal facility subject to regulation under 40 CFR part 262, 264, 265, or 266; or - A facility permitted, licensed, or registered by a State to manage municipal or industrial solid waste, if the process fluids are not hazardous waste as defined in 40 CFR part 261. In-situ sampling systems and sampling systems without purges are exempt from the requirements of 40 CFR (a)-(b). STANDARDS: -- OPEN-ENDED VALVES OR LINES Each open-ended valve or line shall be equipped with a cap, blind flange, plug, or a second valve, except as provided in 40 CFR (c). The cap, blind flange, plug, or second valve shall seal the open end at all times except during operations requiring process fluid flow through the open-ended valve or line. Each open-ended valve or line equipped with a second valve shall be operated in a manner such that the valve on the process fluid end is closed before the second valve is closed. When a double block and bleed system is being used, the bleed valve or line may remain open during operations that require venting the line between the block valves but shall comply with 40 CFR (a) at all other times. The following are exempt from the requirements of 40 CFR (a)-(c): - Open-ended valves or lines in an emergency shutdown system which are designed to open automatically in the event of a process upset. - Open-ended valves or lines containing materials which would autocatalytically polymerize or would present an explosion, serious overpressure, or other safety hazard if capped or equipped with a double block and bleed system as specified in 40 CFR (a)-(c). STANDARDS: -- VALVES Each valve shall be monitored monthly to detect leaks by the method specified in the Test Methods of this subpart and shall comply with the leak detection requirements below. Exceptions are provided in paragraphs (f)-(h), and the alternative standards in section 243 and section 242-1(c). Leak Detection - A leak is detected when: - An instrument reading of 10,000 ppm or greater is measured. Leak Detection - Monitoring: - Any valve for which a leak is not detected for 2 successive months may be monitored the first month of every quarter, beginning with the next quarter, until a leak is detected. - If a leak is detected, the valve shall be monitored monthly until a leak is not detected for 2 successive months. Leak Detection - Repairs: - When a leak is detected, it shall be repaired as soon as practicable, but no later than 15 calendar days after the leak is detected, except as provided in the Delay of Repair section of this subpart. - A first attempt at repair shall be made no later than 5 calendar days after each leak is detected. 40 CFR (a); 40 CFR (b); 40 CFR (c); 40 CFR CFR (a); 40 CFR (b); 40 CFR (c); 40 CFR (d)-(e); 40 CFR CFR (a); 40 CFR (b); 40 CFR (c); 40 CFR (d)-(e); First attempts at repair include, but are not limited to, the following best practices where practicable: - Tightening of bonnet bolts; - Replacement of bonnet bolts; - Tightening of packing gland nuts; and - Injection of lubricant into lubricated packing.

11 TABLE A: LIMITS AND OTHER REQUIREMENTS Facility Name: 3M - Cottage Grove Corporate Incinerator Permit Number: A-7 06/28/12 Any valve that is designated, as described in section 246(e)(2), for no detectable emissions, as indicated by an instrument reading of less than 500 ppm above background, is exempt from the requirements of 40 CFR (a) if the valve: - Has no external actuating mechanism in contact with the process fluid; - Is operated with emissions less than 500 ppm above background, as measured by the method specified in the test methods of this subpart; and - Is tested for compliance with these emissions initially upon designation, annually, and at other times requested by the Administrator. Any valve that is designated, as described in section 246(f)(1), as an unsafe-tomonitor valve is exempt from the requirements of 40 CFR (a) if: - The Permittee demonstrates that the valve is unsafe to monitor because monitoring personnel would be exposed to an immediate danger as a consequence of complying with 40 CFR (a); and - The Permittee has a written plan that requires monitoring of the valve as frequent as practicable during safe-to-monitor times. Any valve that is designated, as described in section 246(f)(2), as a difficult-tomonitor valve is exempt from the requirements of 40 CFR (a) if: - The Permittee demonstrates that the valve cannot be monitored without elevating the monitoring personnel more than 2 meters above a support surface; - The process unit within which the valve is located is an existing process unit; and - The Permittee follows a written plan that requires monitoring of the valve at least once per calendar year. ALTERNATIVE STANDARDS FOR VALVES IN VHAP SERVICE -- Allowable Percentage of Valves Leaking The Permittee may elect to have all valves within a process unit to comply with an allowable percentage of valves leaking of equal to or less than 2.0 percent. The following requirements shall be met if the Permittee decides to comply with an allowable percentage of valves leaking: - The Permittee must notify the Administrator that the Permittee has elected to have all valves within a process unit to comply with the allowable percentage of valves leaking before implementing this alternative standard, as specified in 40 CFR (d). - A performance test as specified below shall be conducted initially upon designation, annually, and at other times requested by the Administrator. - If a valve leak is detected, it shall be repaired in accordance with the Leak Detection standards above. Performance tests shall be conducted in the following manner: - All valves in VHAP service within the process unit shall be monitored within 1 week by the methods specified in the Test Methods of this subpart. - If an instrument reading of 10,000 ppm or greater is measured, a leak is detected. - The leak percentage shall be determined by dividing the number of valves in VHAP service for which leaks are detected by the number of valves in VHAP service within the process unit. Permittees who elect to have all valves comply with this alternative standard shall not have a process unit with a leak percentage greater than 2.0 percent. If the Permittee decides no longer to comply with the Allowable Percentage of Valves Leaking Standard in 40 CFR , the Permittee must notify the Administrator in writing that the work practice standard described in 40 CFR (a)-(e) will be followed. ALTERNATIVE STANDARDS FOR VALVES IN VHAP SERVICE -- Skip Period Leak Detection and Repair The Permittee may elect for all valves within a process unit to comply with one of the alternative work practices specified in the next requirement. 40 CFR (f); 40 CFR (g); 40 CFR (h); 40 CFR CFR (a); 40 CFR (b); 40 CFR (c); 40 CFR (d); 40 CFR (e); 40 CFR CFR (a); The Permittee must notify the Administrator before implementing one of the alternative work practices, as specified in 40 CFR (d).

12 TABLE A: LIMITS AND OTHER REQUIREMENTS Facility Name: 3M - Cottage Grove Corporate Incinerator Permit Number: A-8 06/28/12 The Permittee shall comply initially with the requirements for valves, as described in 40 CFR After 2 consecutive quarterly leak detection periods with the percentage of valves leaking equal to or less than 2.0, the Permittee may begin to skip one of the quarterly leak detection periods for the valves in VHAP service; or 2. After five consecutive quarterly leak detection periods with the percentage of valves leaking equal to or less than 2.0, the Permittee may begin to skip three of the quarterly leak detection periods for the valves in VHAP service. If the percentage of valves leaking is greater than 2.0, the Permittee shall comply with the requirements as described in 40 CFR but may again elect to use this section. STANDARDS: -- PRESSURE RELIEF SERVICES IN LIQUID SERVICE AND CONNECTORS If evidence of a potential leak is found by visual, audible, olfactory, or any other detection method at pressure relief devices in liquid service and connectors, the Permittee shall follow either one of the following procedures, except as provided in 40 CFR (c): - The Permittee shall monitor the equipment within 5 days by the method specified in 40 CFR (b) and shall comply with the requirements of Leak Detection and repair requirements of this section; or - The Permittee shall eliminate the visual, audible, olfactory, or other indication of a potential leak. Leak Detection - A leak is detected when: - An instrument reading of 10,000 ppm or greater is measured. Leak Detection - Repairs: - When a leak is detected, it shall be repaired as soon as practicable, but not later than 15 calendar days after it is detected, except as provided by the Delay of Repair standard. - The first attempt at repair shall be made no later than 5 calendar days after each leak is detected. 40 CFR (b); 40 CFR CFR (a); 40 CFR (b); 40 CFR (c)-(d); First attempts at repair include, but are not limited to, the following best practices where practicable: - Tightening of bonnet bolts; - Replacement of bonnet bolts; - Tightening of packing gland nuts; and - Injection of lubricant into lubricated packing. STANDARDS: -- DELAY OF REPAIR Delay of repair of equipment for which leaks have been detected will be allowed if repair within 15 days is technically infeasible without a process unit shutdown. Repair of this equipment shall occur before the end of the next process unit shutdown. Delay of repair of equipment for which leaks have been detected will be allowed for equipment that is isolated from the process and that does not remain in VHAP service. Delay of repair for valves will be allowed if: - The Permittee demonstrates that emissions of purged material resulting from immediate repair are greater than the fugitive emissions likely to result from delay of repair, and - When repair procedures are effected, the purged material is collected and destroyed or recovered in a control device complying with 40 CFR Delay of repair for pumps will be allowed if: - Repair requires the use of a dual mechanical seal system that includes a barrier fluid system, and - Repair is completed as soon as practicable, but not later than 6 months after the leak was detected. Delay of repair beyond a process unit shutdown will be allowed for a valve if valve assembly replacement is necessary during the process unit shutdown, valve assembly supplies have been depleted, and valve assembly supplies had been sufficiently stocked before the supplies were depleted. Delay of repair beyond the next process unit shutdown will not be allowed unless the next process unit shutdown occurs sooner than 6 months after the first process unit shutdown. 40 CFR CFR (a); 40 CFR (b); 40 CFR (c); 40 CFR (d); 40 CFR (e); ALTERNATIVE MEANS OF EMISSION LIMITATION 40 CFR Permission to use an alternative means of emission limitation under section 112(e)(3) of the Clean Air Act shall be governed by the following procedures: 40 CFR (a)

13 TABLE A: LIMITS AND OTHER REQUIREMENTS Facility Name: Permit Number: 3M - Cottage Grove Corporate Incinerator Where the standard is an equipment, design, or operational requirement: 40 CFR (b) - The Permittee who applyies for permission shall be responsible for collecting and verifying test data for an alternative means of emission limitation to test data for the equipment, design, and operational requirements. - The Administrator may condition the permission on requirements that may be necessary to assure operation and maintenance to achieve the same emission reduction as the equipment, design, and operational requirements. 2. Where the standard is a work practice: 40 CFR (c) - The Permittee shall be responsible for collecting and verifying test data for an alternative means of emission limitation. - For each source the emission reduction achieved by the required work practices shall be demonstrated for a minimum period of 12 months. - For each source the emission reduction achieved by the alternative means of emission limitation shall be demonstrated. - The Permittee shall commit in writing each source to work practices that provide for emission reductions equal to or greater than the emission reductions achieved by the required work practices. - The Administrator will compare the demonstrated emission reduction for the alternative means of emission limitation to the demonstrated emission reduction for the required work practices and will consider the commitment in 40 CFR (c)(4). - The Administrator may condition the permission on requirements that may be necessary to assure operation and maintenance to achieve the same emission reduction as the required work practices of subpart V. 3. The Permittee may offer a unique approach to demonstrate the alternative 40 CFR (d) means of emission limitation. 4. Manufacturers of equipment used to control equipment leaks of a VHAP may 40 CFR (e) apply to the Administrator for permission for an alternative means of emission limitation that achieves a reduction in emissions of the VHAP achieved by the equipment, design, and operational requirements of subpart V. The Administrator will grant permission according to the provisions of 40 CFR (b)-(d). TEST METHODS AND PROCEDURES 40 CFR The Permittee shall use the test methods and procedures listed in 40 CFR for determining compliance with subpart V. Each piece of equipment within a process unit that can conceivably contain equipment in VHAP service is presumed to be in VHAP service unless the Permittee demonstrates that the piece of equipment is not in VHAP service. For a piece of equipment to be considered not in VHAP service, it must be determined that the percent VHAP content can be reasonably expected never to exceed 10% by weight. For purposes of determining the percent VHAP content of the process fluid that is contained in or contacts equipment, procedures that conform to the methods described in ASTM Method D-2267 shall be used. The Permittee may use engineering judgment rather than the procedures in 40 CFR (d)(1) to demonstrate that the percent VHAP content does not exceed 10% by weight, provided that the engineering judgment demonstrates that the VHAP content clearly does not exceed 10% by weight. When the Permittee and the Administrator do not agree on whether a piece of equipment is not in VHAP service, however, the procedures in 40 CFR (d)(1) shall be used to resolve the disagreement. If the Permittee determines that a piece of equipment is in VHAP service, the determination can be revised only after following the procedures in 40 CFR (d)(1). Samples used in determining the percent VHAP content shall be representative of the process fluid that is contained in or contacts the equipment or the gas being combusted in the flare. 40 CFR ; 40 CFR (d)(1); 40 CFR (d)(2); 40 CFR (d)(3); RECORDKEEPING REQUIREMENTS 40 CFR The Permittee may use one recordkeeping system which identifies each record by each process unit to comply with the requirements of all units subject to this subpart. When each leak is detected as specified in GP 001, the following apply: - A weatherproof and readily visible identification, marked with the equipment identification number, shall be attached to the leaking equipment. - The identification on a valve may be removed after it has been monitored for 2 successive months as specified in 40 CFR (c) and no leak has been detected during those 2 months. - The identification on equipment, except on a valve, may be removed after it has been repaired. 40 CFR (a)(2); 40 CFR (b); A-9 06/28/12

14 TABLE A: LIMITS AND OTHER REQUIREMENTS Facility Name: Permit Number: 3M - Cottage Grove Corporate Incinerator When each leak is detected as specified in GP 001, the following information shall be recorded in a log and shall be kept for 2 years in a readily accessible location: - The instrument, operator, and equipment identification numbers. - The date the leak was detected and the dates of each attempt to repair the leak. - Repair methods applied in each attempt to repair the leak. - "Above 10,000" if the maximum instrument reading measured by the methods specified in the Test Methods standard after each repair attempt is equal to or greater than 10,000 ppm. - "Repair delayed" and the reason for the delay if a leak is not repaired within 15 calendar days after discovery of the leak. - The signature of the designate whose decision it was that repair could not be effected without a process shutdown. - The expected date of successful repair of the leak if a leak is not repaired within 15 calendar days. - Dates of process unit shutdowns that occur while the equipment is unrepaired. - The date of successful repair of the leak. For all equipment to which a standard applies, the following information shall be recorded in a log that is kept readily accessible: 1. A list of identification numbers for equipment (except welded fittings) subject to the requirements of subpart V. 2. A list of identification numbers for equipment that the Permittee elects to designate for no detectable emissions as indicated by an instrument reading of less than 500 ppm above background. The designation of this equipment for no detectable emissions shall be signed by the Permittee. 3. A list of equipment identification numbers for pressure relief devices complying with 40 CFR (a). 4. The dates of each compliance test required in GP The background level measured during each compliance test. - The maximum instrument reading measured at the equipment during each compliance test. 5. A list of identification numbers for equipment in vacuum service. The following information pertaining to all valves subject to the requirements of 40 CFR (g)&(h) (unsafe-/difficult-to-monitor) and to all pumps subject to the requirements of 40 CFR (g) (unsafe-to-monitor) shall be recorded in a log that is kept in a readily accessible location: - A list of identification numbers for valves and pumps that are designated as unsafe to monitor, an explanation for each valve or pump stating why the valve or pump is unsafe to monitor, and the plan for monitoring each valve or pump. - A list of identification numbers for valves that are designated as difficult to monitor, an explanation for each valve stating why the valve is difficult to monitor, and the planned schedule for monitoring each valve. The following information shall be recorded for valves complying with 40 CFR (skip period leak detection and repair): - A schedule of monitoring. - The percent of valves found leaking during each monitoring period. The following information shall be recorded in a log that is kept in a readily accessible location: - Design criterion required in 40 CFR (d), and an explanation of the design criterion; and - Any changes to this criterion and the reasons for the changes. The following information shall be recorded in a log that is kept in a readily accessible location for use in determining exemptions as provided in the applicability section of subpart V and other specific subparts: - An analysis demonstrating the design capacity of the process unit, and - An analysis demonstrating that equipment is not in VHAP service. Information and data used to demonstrate that a piece of equipment is not in VHAP service shall be recorded in a log that is kept in a readily accessible location. 40 CFR (c); 40 CFR (e); 40 CFR (f); 40 CFR (g); 40 CFR (h); 40 CFR (i); 40 CFR (j); REPORTING REQUIREMENTS 40 CFR The Permittee shall submit a statement in writing notifying the Administrator that the requirements of 40 CFR , , , and are being implemented for any piece of equipment to which subpart V applies. This statement shall be submitted with the application for approval of construction and shall contain the following information for each source: - Equipment identification number and process unit identification. - Type of equipment (for example, a pump or pipeline valve). - Percent by weight VHAP in the fluid at the equipment. - Process fluid state at the equipment (gas/vapor or liquid). - Method of compliance with the standard (for example, "monthly leak detection and repair" or "equipped with dual mechanical seals"). 40 CFR (a)(1); A-10 06/28/12