A.6 Boilers. A.6.1 New and Existing Boilers located within AQCR 131

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1 A.6 Boilers The following are Minnesota Standards of Performance for Indirect Heating Equipment (Minn. R ) New boilers: construction, modification, or reconstruction commenced after January 31, 1977 Existing boilers: construction, modification, or reconstruction did not commence after January 31, 1977 Air Quality Control Region (AQCR) 131: Anoka, Carver, Dakota, Hennepin, Ramsey, Scott, and Washington counties A.6.1 New and Existing Boilers located within AQCR 131 What to do Total Particulate Matter: less than or equal to 0.40 pounds per million BTU using a 3-hour rolling average The potential to emit from the boilers allowed with this permit is lb/mmbtu due to equipment design and allowable fuels. Opacity: less than or equal to 20% opacity; except for one-six-minute period per hour of not more than 60% opacity. An exceedance of this opacity standard occurs whenever any one-hour period contains two or more six-minute periods during which the average opacity exceeds 20 percent or whenever any one-hour period contains one or more six-minute periods during which the average opacity exceeds 60 percent. Sulfur Dioxide: less than or equal to 1.6 pounds per million BTU using a 3-hour rolling average when combusting liquid fuels The potential to emit from the boilers allowed with this permit is lb/mmbtu due to equipment design and allowable fuels. Why to do it Minn. R , subp. 1 and ; Minn. R and Minn. R , subp. 2; Minn. R , subp. 2 Minn. R , subp. 1 and ; Minn. R and A.6.2 New and Existing Boilers located within the City of Duluth What to do Total Particulate Matter: less than or equal to 0.40 pounds per million BTU using a 3-hour rolling average The potential to emit from the boilers allowed with this permit is lb/mmbtu due to equipment design and allowable fuels. Why to do it Minn. R , subp. 1 and ; Minn. R and aq-12-01q 4/30/15 Page 234

2 Opacity: less than or equal to 20% opacity; except for one-six-minute period per hour of not more than 60% opacity. An exceedance of this opacity standard occurs whenever any one-hour period contains two or more six-minute periods during which the average opacity exceeds 20 percent or whenever any one-hour period contains one or more six-minute periods during which the average opacity exceeds 60 percent. Sulfur Dioxide: less than or equal to 2.0 pounds per million BTU using a 3-hour rolling average when combusting liquid fuels The potential to emit from the boilers allowed with this permit is lb/mmbtu due to equipment design and allowable fuels. Minn. R , subp. 2; Minn. R , subp. 2 Minn. R , subp. 1 and ; Minn. R and A.6.3 New boilers, located outside AQCR 131 and outside the City of Duluth What to do Total Particulate Matter: less than or equal to 0.40 pounds per million BTU using a 3-hour rolling average The potential to emit from the boilers allowed with this permit is lb/mmbtu due to equipment design and allowable fuels. Opacity: less than or equal to 20% opacity; except for one-six-minute period per hour of not more than 60% opacity. An exceedance of this opacity standard occurs whenever any one-hour period contains two or more six-minute periods during which the average opacity exceeds 20 percent or whenever any one-hour period contains one or more six-minute periods during which the average opacity exceeds 60 percent. Sulfur Dioxide: less than or equal to 2.0 pounds per million BTU using a 3-hour rolling average when combusting liquid fuels The potential to emit from the boilers allowed with this permit is lb/mmbtu due to equipment design and allowable fuels. Why to do it Minn. R , subp. 1 and Minn. R , subp. 2 Minn. R , subp. 1 and A.6.4 Existing boilers, located outside AQCR 131 and outside the City of Duluth What to do Total Particulate Matter: less than or equal to 0.60 pounds per million BTU using a 3-hour rolling average The potential to emit from the boilers allowed with this permit is lb/mmbtu due to equipment design and allowable fuels. Why to do it Minn. R and aq-12-01q 4/30/15 Page 235

3 Opacity: less than or equal to 20% opacity; except for one-six-minute period per hour of not more than 60% opacity. An exceedance of this opacity standard occurs whenever any one-hour period contains two or more six-minute periods during which the average opacity exceeds 20 percent or whenever any one-hour period contains one or more six-minute periods during which the average opacity exceeds 60 percent. Sulfur Dioxide: less than or equal to 2.0 pounds per million BTU using a 3-hour rolling average when combusting liquid fuels The potential to emit from the boilers allowed with this permit is lb/mmbtu due to equipment design and allowable fuels. Minn. R , subp. 2 Minn. R and aq-12-01q 4/30/15 Page 236

4 A.6.5 Boilers Subject to NESHAP subp. DDDDD The following are National Emission Standards for Hazardous Air Pollutants for Industrial, Commercial, and Institutional Boilers (40 CFR pt. 63, subp. DDDDD) All boilers subject to 40 CFR pt. 63, subp. DDDDD Affected Source for NESHAP subp. DDDDD: 1. The collection at the facility of all existing industrial, commercial, and institutional boilers within a subcategory. (Subcategories defined in ) a. Eligible affected sources are in the gas 1 and light liquid fuels (distillate oil) subcategories. 2. Each new or reconstructed industrial, commercial, or institutional boiler. New Source: construction or reconstruction commenced after June 4, 2010 at a major source of HAPs Existing sources: construction or reconstruction commenced on or before June 4, 2010 at a major source of HAPs What to do Compliance dates: The Permittee shall comply with 40 CFR pt. 63, subp. DDDDD no later than the following compliance dates, except as provided in 40 CFR 63.6(i): - For any boiler constructed or reconstructed after June 4, 2010, the compliance date is January 31, 2013, or upon startup of the boiler, whichever is later. - For any boiler constructed or reconstructed on or before June 4, 2010, the compliance date is January 31, EMISSION LIMITS AND OPERATIONAL REQUIREMENTS The Permittee shall at all times operate and maintain each boiler at the facility in a manner consistent with safety and good air pollution control practices for minimizing emissions. Determination of whether such operation and maintenance procedures are being used will be based on information available to the EPA Administrator that may include, but is not limited to, monitoring results, review of operation and maintenance procedures, review of operation and maintenance records, and inspection of the source. The Permittee shall comply with the emission limits, work practice standards, and operating limits in 40 CFR pt. 63, subp. DDDDD. These limits apply at all times the affected unit is operating except during periods of startup and shutdown during which time the Permittee shall comply only with the tune-up and energy assessment requirements below. Tune up means adjustments made to a boiler in accordance with the procedures outlined in (a)(10)(i)-(vi): i) As applicable, the Permittee shall inspect the burner, and clean or replace any components of the burner as necessary. The Permittee may delay the Why to do it ; Minn. R. hdr (a)(3); Minn. R. s (a) and (f); Minn. R (a)(10); Minn. R. aq-12-01q 4/30/15 Page 237

5 burner inspection until the next scheduled unit shutdown. Units that produce electricity for sale may delay the burner inspection until the first outage, not to exceed 36 months (72 months for those units requiring a tune up only every 5 years) from the previous inspection. At units where entry into a piece of process equipment or into a storage vessel is required to complete the tune up inspections, inspections are required only during planned entries into the storage vessel or process equipment; ii) The Permittee shall inspect the flame pattern, as applicable, and adjust the burner as necessary to optimize the flame pattern. The adjustment should be consistent with the manufacturer s specifications, if available; iii) The Permittee shall inspect the system controlling the air-to-fuel ratio, as applicable, and ensure that it is correctly calibrated and functioning properly. The Permittee may delay the inspection until the next scheduled unit shutdown. Units that produce electricity for sale may delay the inspection until the first outage, not to exceed 36 months (72 months for those units requiring a tune up only every 5 years) from the previous inspection; iv) The Permittee shall optimize total emissions of CO. The optimization should be consistent with manufacturer s specifications, if available, and with any NOx requirement to which the unit is subject; v) The Permittee shall measure the concentrations in the effluent stream of CO in parts per million, by volume, and oxygen in volume percent, before and after the adjustments are made Measurements may be either on a dry or wet basis, as long as it is the same basis before and after adjustments are made Measurements may be taken using a portable CO analyzer; and vi) The Permittee shall maintain on-site and submit, if requested by the Administrator, an annual report as described in the Recordkeeping requirements below. General Provisions Appendix: This permit contains an appendix which lists the requirements of the general provisions in s 63.1 through 63.15, and shows which parts of the general provisions apply to sources subject to 40 CFR pt. 63, subp. DDDDD. The Permittee shall comply with all applicable requirements contained in the General Provisions Appendix (Appendix B). RECORDKEEPING Daily Recordkeeping Startup and Shutdown: On each day that a boiler is started up or shut down, the Permittee shall record and maintain: 1) the Emission Unit ID Number of the boiler (as designated on form LE-02); 2) the calendar date, time, occurrence and duration of each startup and shutdown; and 3) the type and amount of fuels used during each startup and shutdown. The Permittee shall maintain on-site and submit, if requested by the , Table 10 to 40 CFR pt. 63, subp. DDDDD; Minn. R. ; Minn. R , subp. 2 Hdr s (i) and (j); Minn. R. ; Minn. R , subp. 2 s aq-12-01q 4/30/15 Page 238

6 Administrator, a biennial (or five-year for those units requiring a tune up only every 5 years) report containing the following information: (A) The concentrations of CO in the effluent stream in parts per million by volume, and oxygen in volume percent, measured at high fire or typical operating load, before and after the tune-up of the boiler; (B) A description of any corrective actions taken as a part of the tune-up; and (C) The type and amount of fuel used over the 24 (or 60 for those units requiring a tune up only every 5 years) months prior to the tune-up, but only if the unit was physically and legally capable of using more than one type of fuel during that period. Units sharing a fuel meter may estimate the fuel used by each unit. The Permittee shall maintain relevant records of: 1) The occurrence and duration of each startup, shutdown, or malfunction of operation (i.e., process equipment); 2) The occurrence and duration of each malfunction of the required air pollution control and monitoring equipment; 3) All required maintenance performed on the air pollution control and monitoring equipment; 4) Actions taken during periods of startup, shutdown, and malfunction (including corrective actions to restore malfunctioning process and air pollution control and monitoring equipment to its normal or usual manner of operation) when such actions are different from the procedures specified in the SSMP; 5) All information necessary to demonstrate conformance with the SSMP when all actions taken during periods of startup, shutdown, and malfunction (including corrective actions to restore malfunctioning process and air pollution control and monitoring equipment to its normal or usual manner of operation) are consistent with the procedures specified in such plan. (The information needed to demonstrate conformance with the SSMP may be recorded using a checklist, or some other effective form of recordkeeping, in order to minimize the recordkeeping burden for conforming events); 6) All required measurements needed to demonstrate compliance with a relevant standard (including, but not limited to and raw performance testing measurements that support data that the source is required to report); 7) All results of performance tests; 8) All measurements as may be necessary to determine the conditions of performance tests; and 9) All documentation supporting initial notifications and notifications of compliance status under The Permittee shall keep the following records: 1) A copy of each notification and report that was submitted to comply with subpart DDDDD, including all documentation supporting any Initial Notification or Notification of Compliance Status or Semi-Annual Compliance Report that was submitted, according to the requirements in (a)(10)(vi) and (a)(11)- (12); Minn. R (b)(2); Minn. R (a); Minn. R. aq-12-01q 4/30/15 Page 239

7 63.10(b)(2)(xiv); and 2) Records of performance tests, fuel analyses, or other compliance demonstrations and performance evaluations as required in 63.10(b)(2)(viii). The Permittee shall keep the required records in a form suitable and readily available for expeditious review, according to 63.10(b)(1). The Permittee shall keep each record for 5 years following the date of each occurrence, measurement, maintenance, corrective action, report, or record. The Permittee shall keep each record on site for at least 2 years after the date of each occurrence, measurement, maintenance, corrective action, report, or record. The Permittee may keep the records off site for the remaining 3 years. Such files may be maintained on microfilm, on a computer, on computer floppy disks, on magnetic tape disks, or on microfiche. REPORTING Submittals and notifications under 40 CFR pt. 63, subp. DDDDD shall be sent to both the MPCA and EPA contacts listed on the first page of Table B of this permit, unless otherwise noted. The Permittee shall submit all of the notifications in s 63.7(b) and (c), 63.8 (e), (f)(4) and (6), and 63.9(b) through (h) that apply by the dates specified. See the General Provisions Appendix B to this permit for these requirements. Initial Notification: The Permittee shall submit an Initial Notification not later than 120 days after January 31, 2013, for each industrial boiler unit started up before January 31, Initial Notification: The Permittee shall submit an Initial Notification not later than 15 days after actual the actual date of startup, for each industrial boiler unit started up on or after January 31, Notification of compliance status: due 60 days after Demonstration Completion. The Permittee shall submit a Notification of Compliance Status according to 40 CFR Section 63.9(h)(2)(ii). The Notification of Compliance Status report shall contain the information specified below: - A description of the affected unit(s) including identification of which subcategories the unit is in, the design heat input capacity of the unit, description of the fuel(s) burned; - A signed certification that the affected units have met all applicable emission limits and work practice standards; - If there was a deviation from any emission limit, work practice standard, or operating limit, the Permittee shall also submit a description of the deviation, the duration of the deviation, and the corrective action taken in the Notification of Compliance Status report; ; 40 CFR Section 63.10(b)(1); Minn. R. hdr Minn. R , subp (a); Minn. R (b); 40 CFR Section 63.9(b)(2); Minn. R (c); Minn. R (e); 40 CFR Sections (d)- (f); 63.9(h); Minn. R. aq-12-01q 4/30/15 Page 240

8 - In addition to the information required in 63.9(h)(2), the Notification of Compliance Status shall include the following certification(s) of compliance, as applicable, and signed by a responsible official: o This facility complies with the required initial tune-up according to the procedures in s (a)(10(i) through (vi). o This facility has had an energy assessment performed according to 40 CFR 7530(e). o Except for units that burn only natural gas, refinery gas, or other gas 1 fuel, or units that qualify for a statutory exemption as provided in Section 129(g)(1) of the Clean Air Act, the Permittee shall also include the following: No secondary materials that are solid waste were combusted in any affected unit. Compliance Report: due 31 days after end of each calendar 24 months following Permit Issuance for those units requiring a tune-up every two years. The reporting period shall be [year 1] January 1 to [year 2] December 31. The Compliance Report is due 31 days after the end of the reporting period. The first compliance report shall cover the period beginning on the compliance date that is specified for each boiler in and ending on July 31 or January 31, whichever date is the first date that occurs at least 2 years after the compliance date that is specified for the emission unit in Section Each subsequent compliance report shall cover the 2-year period from January 1 to December 31. Compliance Report: due 31 days after end of each calendar 60 months following Permit Issuance for those units requiring a tune-up every five years. The reporting period shall be [year 1] January 1 to [year 5] December 31. The Compliance Report is due 31 days after the end of the reporting period. The first compliance report shall cover the period beginning on the compliance date that is specified for each boiler in and ending on July 31 or January 31, whichever date is the first date that occurs at least 5 years after the compliance date that is specified for the emission unit in Section Each subsequent compliance report shall cover the 5-year period from January 1 to December 31. Report - Compliance Report - report contents (biennial and 5-year). The report shall contain: a. If the facility is subject to the requirements of a tune up, the Permittee shall include the following information in the compliance report: - Company and Facility name and address, - Process unit information, emissions limitations, and operating parameter limitations, - Date of report and beginning and ending dates of the reporting period, - The total operating time during the reporting period, (b); Minn. R (b); Minn. R. s (b) and (c); 40 CFR pt. 63, subp. DDDDD, Table 9; Minn. R. aq-12-01q 4/30/15 Page 241

9 - If a malfunction occurred during the reporting period, the report shall include the number, duration, and a brief description for each type of malfunction which occurred during the reporting period and which caused or may have caused any applicable emission limitation to be exceeded. The report shall also include a description of actions taken by the Permittee during malfunction of a boiler to minimize emissions in accordance with (a)(3), including actions taken to correct the malfunction, - For each unit subject only to the requirement to conduct a biennial or 5- year tune-up according to (a)(10), (11), or (12) respectively, the Permittee shall include the date of the most recent tune-up. The Permittee shall also include the date of the most recent burner inspection if it was not done biennially or on a 5-year period and was delayed until the next scheduled or unscheduled unit shutdown, - Statement by a responsible official with that official s name, title, and signature, certifying the truth, accuracy, and completeness of the content of the report; b. If there are no deviations from the requirements for work practice standards in Table 3 to subpart DDDDD that apply to the boiler, a statement that there were no deviations from the work practice standards during the reporting period; and c. If there was a deviation from a work practice standard during the reporting period, the report must contain the following information: - A description of the deviation and which emission limit or operating limit from which it deviated, and - Information on the number, duration, and cause of deviations (including unknown cause), as applicable, and the corrective action taken. Notification of fuel switch: If the Permittee switches fuels or makes a physical change to an affected boiler and the fuel switch or physical change results in the applicability of a different subcategory, the Permittee shall provide notice of the date of the switch/change within 30 days of the switch/change. The notification shall identify: - The name of the Permittee, the location of the source, the boiler(s) that have switched fuels or were physically changed, and the date of the notice; - The currently applicable subcategory under 40 CFR pt. 63, subp. DDDDD; and - The date upon which the fuel switch or physical change occurred (h); Minn. R. aq-12-01q 4/30/15 Page 242

10 A Boilers subject to NESHAP subp. DDDDD (Light Liquid Fuel) Boilers subject to 40 CFR pt. 63, subp. DDDDD in the Units Designed to Burn Light Liquid Fuel Subcategory What to do Why to do it EMISSION LIMITS AND OPERATIONAL REQUIREMENTS Fuel Type: natural gas or distillate oil only Performance Tune Up: At least once every two years (24 month period starting with Permit Issuance), the Permittee shall complete a tune-up for each boiler with heat input capacity between 5-10 MMBtu/hr, not to exceed 25 calendar months between tune-ups. This tune-up shall be conducted as specified in the Tune-up requirements in the boilers section of this permit. If the unit is not operating on the required date for a tune-up, the Permittee must conduct the tune-up within 30 calendar days of startup. Performance Tune Up: At least once every five years (60 month period starting with Permit Issuance), the Permittee shall complete a tune-up for each boiler with heat input capacity less than or equal to 5 MMBtu/hr, not to exceed 61 calendar months between tune-ups. This tune-up shall be conducted as specified in the Tune-up requirement in the boiler section of this permit. If the unit is not operating on the required date for a tune-up, the Permittee must conduct the tune-up within 30 calendar days of startup. ADDITIONAL REQUIREMENTS FOR UNITS CONSTRUCTED BEFORE JUNE 4, 2010 The Permittee shall comply with the Maximum Achievable Control Technology (MACT) Standard for Industrial, Commercial, and Institutional Boilers and Process Heaters at Major Sources as of January 31, 2016 (the Compliance Date), except as provided in 63.6(i). Energy Assessment: The Permittee shall have a one-time energy assessment performed by a qualified energy assessor for each existing boiler at the facility. The energy assessment must include the following with extent of the evaluation for items a. to e. appropriate for the on-site technical hours listed in 40 CFR Section : a. A visual inspection of the boiler system; b. An evaluation of operating characteristics of the boiler systems, specifications of energy using systems, operating and maintenance hdr ; Minn. R. ; Minn. R , subp. 2; To qualify for this general permit under Minn. R s ; (d); and (a)(11); Minn. R. s ; (d); and (a)(12); Minn. R. hdr (b); Minn. R ; Minn. R. aq-12-01q 4/30/15 Page 243

11 procedures, and unusual operating constraints; c. An inventory of major energy use systems consuming energy from affected boilers and which are under the control of the boiler owner/operator; d. A review of available architectural and engineering plans, facility operation and maintenance procedures and logs, and fuel usage; e. A review of the facility's energy management practices and provide recommendations for improvements consistent with the definition of energy management practices, if identified; f. A list of cost-effective energy conservation measures that are within the facility's control; g. A list of the energy savings potential of the energy conservation measures identified; h. A comprehensive report detailing the ways to improve efficiency, the cost of specific improvements, benefits, and the time frame for recouping those investments. An energy assessment completed on or after January 1, 2008, that meets or is amended to meet the energy assessment requirements in Table 3 to 40 CFR pt. 63, subp. DDDDD, satisfies the energy assessment requirement. A facility that operates under an energy management program compatible with ISO that includes the affected unit also satisfies the energy assessment requirement. A Boilers subject to NESHAP subp. DDDDD (Gas 1 Fuel) Boilers subject to 40 CFR pt. 63, subp. DDDDD in the Units Designed to Burn Gas 1 Fuel Subcategory What to do Why to do it EMISSION LIMITS AND OPERATIONAL REQUIREMENTS Fuel Type: natural gas or distillate oil (as backup) only Fuel Usage: less than or equal to 48 hours as a combined total per calendar year using liquid fuel for periodic testing of liquid fuel, maintenance, or operator training; except during periods of gas curtailment or gas supply interruptions of any duration. Liquid fuel may be used during periods of gas curtailment or gas supply interruptions of any duration. "Combined total" refers to the total hours for which liquid fuel was burned at hdr ; Minn. R. ; Minn. R , subp. 2; To qualify for this general permit under Minn. R ; Minn. R. ; Minn. R , subp. 2 aq-12-01q 4/30/15 Page 244

12 each subject boiler at the facility. Performance Tune Up: At least once every two years (24 month period starting with Permit Issuance), the Permittee shall complete a tune-up for each boiler with heat input capacity between 5-10 MMBtu/hr, not to exceed 25 calendar months between tune-ups. This tune-up shall be conducted as specified in the Tune-up requirement in the boilers section of this permit. If the unit is not operating on the required date for a tune-up, the Permittee must conduct the tune-up within 30 calendar days of startup. Performance Tune Up: At least once every five years (60-month period starting with Permit Issuance), the Permittee shall complete a tune-up for each boiler with heat input capacity less than or equal to 5 MMBtu/hr, not to exceed 61 calendar months between tune-ups. This tune-up shall be conducted as specified in the Tune-up requirement in the boilers section of this permit. If the unit is not operating on the required date for a tune-up, the Permittee must conduct the tune-up within 30 calendar days of startup. Performance Tune Up: At least once every five years (60-month period starting with Permit Issuance), the Permittee shall complete a tune-up for each boiler without a continuous oxygen trim system that maintains an optimum air to fuel ratio, not to exceed 61 calendar months between tune-ups. This tune-up shall be conducted as specified in the Tune-up requirement in the boilers section of this permit. If the unit is not operating on the required date for a tune-up, the Permittee must conduct the tune-up within 30 calendar days of startup. Period of gas curtailment or supply interruption means a period of time during which the supply of gaseous fuel to an affected boiler is restricted or halted for reasons beyond the control of the facility. The act of entering into a contractual agreement with a supplier of natural gas established for curtailment purposes does not constitute a reason that is under the control of the facility for the purposes of this definition. An increase in the cost or unit price of natural gas due to normal market fluctuations not during periods of supplier delivery restriction does not constitute a period of natural gas curtailment or supply interruption. On-site gaseous fuel system emergencies or equipment failures qualify as periods of supply interruption when the emergency or failure is beyond the control of the facility. ADDITIONAL REQUIREMENTS FOR UNITS CONSTRUCTED BEFORE JUNE 4, 2010 The Permittee shall comply with the Maximum Achievable Control Technology (MACT) Standard for Industrial, Commercial, and Institutional Boilers and Process Heaters at Major Sources as of January 31, 2016 (the Compliance Date), except as provided in 60.6(i). Energy Assessment: The Permittee shall have a one-time energy assessment performed by a qualified energy assessor for each existing boiler at the facility. s (e); (d); and (a)(11); Minn. R. s (e); (d); and (a)(12); Minn. R. s (e); (d); and (a)(12); Minn. R ; Minn. R. hdr (b); Minn. R ; Minn. R. aq-12-01q 4/30/15 Page 245

13 The energy assessment must include the following with extent of the evaluation for items a. to e. appropriate for the on-site technical hours listed in 40 CFR Section : a. A visual inspection of the boiler system; b. An evaluation of operating characteristics of the boiler systems, specifications of energy using systems, operating and maintenance procedures, and unusual operating constraints; c. An inventory of major energy use systems consuming energy from affected boilers and which are under the control of the boiler owner/operator; d. A review of available architectural and engineering plans, facility operation and maintenance procedures and logs, and fuel usage; e. A review of the facility's energy management practices and provide recommendations for improvements consistent with the definition of energy management practices, if identified; f. A list of cost-effective energy conservation measures that are within the facility's control; g. A list of the energy savings potential of the energy conservation measures identified; h. A comprehensive report detailing the ways to improve efficiency, the cost of specific improvements, benefits, and the time frame for recouping those investments. An energy assessment completed on or after January 1, 2008, that meets or is amended to meet the energy assessment requirements in Table 3 to 40 CFR pt. 63, subp. DDDDD, satisfies the energy assessment requirement. A facility that operates under an energy management program compatible with ISO that includes the affected unit also satisfies the energy assessment requirement. RECORDKEEPING Daily Recordkeeping - Alternative fuel usage: On each day that a boiler in the Unit designed to burn gas 1 subcategory burns a fuel other than natural gas, the Permittee shall record and maintain: 1) The Emission Unit ID Number of the boiler (as designated on form LE-02); 2) The number of hours that the boiler burned the alternative fuel; 3) The reason for burning the alternative fuel (e.g. periodic testing of liquid fuel, maintenance, or operator training; period of gas curtailment or gas supply interruptions); and 4) The type of fuel burned. Monthly Recordkeeping Alternative fuel usage: By the 15th of each month following a calendar month during which a boiler in the Unit designed to burn gas 1 subcategory burned a fuel other than natural gas, the Permittee shall record and maintain: hdr (h); Minn. R. ; Minn. R , subp (h); Minn. R. ; Minn. R , subp. 2 1) The Emission Unit ID Number of the boiler (as designated on form LE-02) and total number of hours for the previous calendar month that an alternative fuel aq-12-01q 4/30/15 Page 246

14 was burned for periodic testing of liquid fuel, maintenance, or operator training for each boiler in the Unit designed to burn gas 1 subcategory that burned an alternative fuel; 2) The combined total number of hours for the current calendar year (from January 1 through the end of the previous calendar month) that alternative fuels were burned for periodic testing of liquid fuel, maintenance, or operator training for all boilers in Unit designed to burn gas 1 subcategory that burned alternative fuels; 3) The Emission Unit ID Number of the boiler (as designated on form LE-02) and total number of hours for the previous calendar month that an alternative fuel was burned for any reason for each boiler in the Unit designed to burn gas 1 subcategory that burned an alternative fuel; and 4) The combined total number of hours for the current calendar year (from January 1 through the end of the previous calendar month) that alternative fuels were burned for any reason for all boilers in Unit designed to burn gas 1 subcategory that burned alternative fuels. REPORTING Notification of Alternative Fuel Use: The Permittee shall submit a notification of alternative fuel use within 48 hours of the declaration of each period of natural gas curtailment or supply interruption, as defined in The notification shall include the information specified in (f) paragraphs (1) through (5) below, and shall be sent to both MPCA and EPA. (1) Company name and address. (2) Identification of the affected unit. (3) Reason the Permittee is unable to use natural gas or equivalent fuel, including the date when the natural gas curtailment was declared or the natural gas supply interruption began. (4) Type of alternative fuel that the Permittee intends to use. (5) Dates when the alternative fuel use is expected to begin and end. hdr (f); Minn. R. aq-12-01q 4/30/15 Page 247

15 A.6.6 Boilers Subject to NESHAP subp. JJJJJJ The following are National Emission Standards for Hazardous Air Pollutants for Industrial, Commercial, and Institutional Boilers (40 CFR pt. 63, subp. JJJJJJ) All boilers subject to 40 CFR pt. 63, subp. JJJJJJ Eligibility Requirements: The Permittee must use only distillate oil (diesel, fuel oil #1 or #2), natural gas, biodiesel, liquid petroleum gas, and/or gasoline fuels in stationary combustion sources. Affected Source for NESHAP subp. JJJJJJ: 1. The collection at an area source of HAPs of all existing industrial, commercial, and institutional boilers within a subcategory. (Subcategories defined in ) except as specified in a. Eligible affected sources are in the light liquid fuels (distillate oil) subcategories. b. Facilities which burn only natural gas (gas 1 fuels) are not subject to this standard. 2. Each new or reconstructed industrial, commercial, or institutional boiler. New Source: construction or reconstruction commenced after June 4, 2010 at an area source of HAPs Existing sources: construction or reconstruction commenced on or before June 4, 2010 at an area source of HAPs Definitions: Gaseous fuels includes, but is not limited to, natural gas, process gas, landfill gas, coal derived gas, refinery gas, hydrogen, and biogas. Gas-fired boiler includes any boiler that burns gaseous fuels not combined with any solid fuels and burns liquid fuel only during periods of gas curtailment, gas supply interruption, startups, or periodic testing on liquid fuel. Periodic testing of liquid fuel shall not exceed a combined total of 48 hours during any calendar year. Liquid fuel includes, but is not limited to, distillate oil, residual oil, any form of liquid fuel derived from petroleum, used oil meeting the specification in 40 CFR , liquid biofuels, biodiesel, and vegetable oil, and comparable fuels as defined under 40 CFR Seasonal boiler means a boiler that undergoes a shutdown for a period of at least 7 consecutive months (or 210 consecutive days) each 12-month period due to seasonal conditions, except for periodic testing. Periodic testing shall not exceed a combined total of 15 days during the 7-month shutdown. This definition only applies to boilers that would otherwise be included in the biomass subcategory or the oil subcategory. Temporary boiler means any gaseous or liquid fuel boiler that is designed to, and is capable of, being carried or moved from one location to another by means of, for example, wheels, skids, carrying handles, dollies, trailers, or platforms. A boiler is not a temporary boiler if any one of the following conditions exists: aq-12-01q 4/30/15 Page 248

16 (1) The equipment is attached to a foundation. (2) The boiler or a replacement remains at a location within the facility and performs the same or similar function for more than 12 consecutive months, unless the regulatory agency approves an extension. An extension may be granted by the regulating agency upon petition by the owner or operator of a unit specifying the basis for such a request. Any temporary boiler that replaces a temporary boiler at a location within the facility and performs the same or similar function will be included in calculating the consecutive time period unless there is a gap in operation of 12 months or more. (3) The equipment is located at a seasonal facility and operates during the full annual operating period of the seasonal facility, remains at the facility for at least 2 years, and operates at that facility for at least 3 months each year. (4) The equipment is moved from one location to another within the facility but continues to perform the same or similar function and serve the same electricity, steam, and/or hot water system in an attempt to circumvent the residence time requirements of this definition. What to do Compliance dates: The Permittee shall comply with 40 CFR pt. 63, subp. JJJJJJ no later than the following compliance dates: - For any existing boiler subject to a management practice standard of a tuneup, you must conduct the tune-up no later than March 21, For any boiler constructed or reconstructed after May 20, 2011, the compliance date is upon startup of the boiler. - For any boiler constructed or reconstructed on or before May 20, 2011, the compliance date is no later than May 20, EMISSION LIMITS AND OPERATIONAL REQUIREMENTS The Permittee shall at all times operate and maintain each boiler at the facility in a manner consistent with safety and good air pollution control practices for minimizing emissions. The general duty to minimize emissions does not require you to make any further efforts to reduce emissions if required levels have been achieved. Determination of whether such operation and maintenance procedures are being used will be based on information available to the EPA Administrator that may include, but is not limited to, review of operation and maintenance procedures, review of operation and maintenance records, and inspection of the source. The Permittee shall conduct an initial tune-up for the following existing boilers in accordance with Table 2 to 40 CFR pt. 63, subp. JJJJJJ: - Existing oil-fired boiler with heat input capacity greater than 5 MMBtu/hr that does not meet the definition of seasonal boiler or limited-use boiler, or uses an oxygen trim system that maintains an optimum air to fuel ratio. - Existing seasonal boiler Why to do it hdr (b); 40 CFR Section (b) aq-12-01q 4/30/15 Page 249

17 - Existing limited-use boiler - Existing oil-fired boiler with heat input capacity less than or equal to 5 MMBtu/hr - Existing oil-fired boiler with an oxygen trim system that maintains an optimum air to fuel ratio that would otherwise be subject to a biennial tune-up. Performance Tune Up: At least once every two years (24-month period starting with permit issuance), the Permittee shall conduct a biennial tune-up for the following boilers in accordance with Table 2 to 40 CFR pt. 63, subp. JJJJJJ: - Existing oil-fired boilers with heat input capacity greater than 5 MMBtu/hr that do not meet the definition of a seasonal boiler or a limited-use boiler, or use an oxygen trim system that maintains an optimum air to fuel ratio. - New oil-fired boilers with heat input capacity greater than 5 MMBtu/hr that do not meet the definition of a seasonal boiler or a limited-use boiler, or use an oxygen trim system that maintains an optimum air to fuel ratio (b); 40 CFR Section (b) Each 2-year tune-up for must be conducted no more than 25 months after the previous tune-up. The Permittee may delay the burner inspection and inspection of the system controlling the air-to-fuel ratio until the next scheduled unit shutdown, but must inspect each burner and system controlling the air-to-fuel ratio at least once every 30 months. Performance Tune Up: At least once every five years (60-month period starting with permit issuance), the Permittee shall conduct a tune-up for the following boilers in accordance with Table 2 to 40 CFR pt. 63, subp. JJJJJJ: - Existing seasonal boiler - New seasonal boiler - Existing limited-use boiler - New limited-use boiler - Existing oil-fired boiler with heat input capacity less than or equal to 5 MMBtu/hr - New oil-fired boiler with heat input capacity less than or equal to 5 MMBtu/hr - Existing oil-fired boiler with an oxygen trim system that maintains an optimum air to fuel ratio that would otherwise be subject to a biennial tune-up. - New oil-fired boiler with an oxygen trim system that maintains an optimum air to fuel ratio that would otherwise be subject to a biennial tune-up (b); 40 CFR Sections (c)- (f), (b) Continued below Each 5-year tune-up for must be conducted no more than 61 months after the previous tune-up. The Permittee may delay the burner inspection and inspection of the system controlling the air-to-fuel ratio until the next scheduled unit shutdown, but must inspect each burner and system controlling the air-to-fuel ratio at least once every 72 months. aq-12-01q 4/30/15 Page 250

18 Conduct the performance tune-up while burning the type of fuel (or fuels) that provided the majority of the heat input to the boiler over the 12 months prior to the tune-up. Tune up means adjustments made to a boiler in accordance with the procedures outlined in (i)-(v): i) As applicable, the Permittee shall inspect the burner, and clean or replace any components of the burner as necessary. The Permittee may delay the burner inspection until the next scheduled unit shutdown. Units that produce electricity for sale may delay the burner inspection until the first outage, not to exceed 36 months (72 months for those units requiring a tune up only every 5 years) from the previous inspection; ii) The Permittee shall inspect the flame pattern, as applicable, and adjust the burner as necessary to optimize the flame pattern. The adjustment should be consistent with the manufacturer s specifications, if available; iii) The Permittee shall inspect the system controlling the air-to-fuel ratio, as applicable, and ensure that it is correctly calibrated and functioning properly. The Permittee may delay the inspection until the next scheduled unit shutdown. Units that produce electricity for sale may delay the inspection until the first outage, not to exceed 36 months (72 months for those units requiring a tune up only every 5 years) from the previous inspection; iv) The Permittee shall optimize total emissions of CO. The optimization should be consistent with manufacturer s specifications, if available, and with any NOx requirement to which the unit is subject; and v) The Permittee shall measure the concentrations in the effluent stream of CO in parts per million, by volume, and oxygen in volume percent, before and after the adjustments are made Measurements may be either on a dry or wet basis, as long as it is the same basis before and after adjustments are made Measurements may be taken using a portable CO analyzer. If the boiler is not operating on the required date for a tune-up, the tune-up must be conducted within 30 days of startup. General Provisions Appendix: This permit contains an appendix which lists the requirements of the general provisions in s 63.1 through 63.15, and shows which parts of the general provisions apply to sources subject to 40 CFR pt. 63, subp. JJJJJJ. The Permittee shall comply with all applicable requirements contained in the General Provisions Appendix (Appendix B) (a) (b)(1)-(5) (b)(7) , Table 10 to 40 CFR pt. 63, subp. JJJJJJ; Minn. R , subp. 2 RECORDKEEPING The Permittee must keep a copy of each notification and report submitted and all documentation supporting any Initial Notification or Notification of Compliance Status that you submitted (c)(1) aq-12-01q 4/30/15 Page 251

19 The Permittee shall keep records to document conformance with the work practices, emission reduction measures and management practices required by s and as follow: 1) Records must identify each boiler, the date of tune-up, the procedures followed for tune-up, and the manufacturer s specifications to which the boiler was tuned. 2) For each boiler that meets the definition of seasonal boiler, the Permittee must keep records of days of operation per year. The Permittee shall: 1) keep the required records in a form suitable and readily available for expeditious review; 2) keep each record for 5 years following the date of each recorded action and 3) keep each record on site or be accessible from a central location by computer or other means that instantly provide access at the site for at least 2 years after the date of each recorded action. The Permittee may keep the records off site for the remaining 3 years. REPORTING Submittals and notifications under 40 CFR pt. 63, subp. JJJJJJ shall be sent to both the MPCA and EPA contacts listed on the first page of Table B of this permit, unless otherwise noted. The Permittee shall submit all of the notifications in s 63.7(b), 63.8 (e) and (f), and 63.9(b) through (e), (g) and (h) that apply by the dates specified. See the General Provisions Appendix B to this permit for these requirements. Initial Notification: The Permittee shall submit an Initial Notification not later than January 20, 2014, or within 120 days after the source becomes subject to the standard. Notification of Compliance Status for new oil-fired boilers: due 120 days after startup. The notification must be submitted electronically using the Compliance and Emissions Data Reporting Interface (CEDRI) that is accessed through EPA's Central Data Exchange (CDX) ( However, if the reporting form specific to this subpart is not available in CEDRI at the time that the report is due, the written Notification of Compliance Status must be submitted to the Administrator at the address provided in this permit. Compliance Report: due 31 days after end of each calendar 24 months following Permit Issuance for those units requiring a tune-up every two years. The reporting period shall be [year 1] January 1 to [year 2] December 31. The Compliance Report is due 31 days after the end of the reporting period. The first compliance report shall cover the period beginning on the compliance date that is specified for each boiler and ending on July 31 or January 31, (c)(2) (d) hdr Minn. R , subp (a)(1) (a)(2); CFR Section 63.9(b)(2) (b); 40 CFR Section (b); 63.9(h) (4)(vi) (b) aq-12-01q 4/30/15 Page 252

20 whichever date is the first date that occurs at least 2 years after the compliance date that is specified for the emission unit in Each subsequent compliance report shall cover the 2-year period from January 1 to December 31. Compliance Report: due 31 days after end of each calendar 60 months following Permit Issuance for those units requiring a tune-up every five years. The reporting period shall be [year 1] January 1 to [year 5] December 31. The Compliance Report is due 31 days after the end of the reporting period. The first compliance report shall cover the period beginning on the compliance date that is specified for each boiler and ending on July 31 or January 31, whichever date is the first date that occurs at least 5 years after the compliance date that is specified for the emission unit Each subsequent compliance report shall cover the 5-year period from January 1 to December 31. Report - Compliance Report Contents (biennial and 5-year). The report shall contain: a. Company and Facility name and address, b. Statement by a responsible official, with the official s name, title, phone number, address, and signature, certifying the truth, accuracy, and completeness of the content of the report, and a statement that the facility has complied with all the relevant standards and other requirements; c. The following certifications of compliance, as applicable signed by a responsible official: i. This facility complies with the requirements of to conduct a biennial or 5-year tune-up, as applicable, of each boiler. ii. No secondary materials that are solid waste were combusted in any affected unit. iii. This facility complies with the requirements in s (d) and (g) to minimize the boiler s time spent during startup and shutdown and to conduct startups and shutdowns according to the manufacturer s recommended procedures or procedures specified for a boiler of similar design if manufacturer s recommended procedures are not available. Notification of fuel switch: If the Permittee switches fuels or makes a physical change to an affected boiler and the fuel switch or change results in the applicability of a different subcategory, the Permittee shall provide notice of the date of the switch/change within 30 days. The notification shall identify: - The name of the Permittee, the location of the source, the boiler(s) that have switched fuels or were physically changed, and the date of the notice; - The currently applicable subcategory; and - The date upon which the fuel switch or physical change occurred (b) (4)(b) (4)(g) aq-12-01q 4/30/15 Page 253