AIR EMISSION PERMIT NO IS ISSUED TO. COLD SPRING GRANITE COMPANY 202 South 3rd Avenue Cold Spring, Stearns County, MN 56320

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1 AIR EMISSION PERMIT NO IS ISSUED TO COLD SPRING GRANITE COMPANY 202 South 3rd Avenue Cold Spring, Stearns 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 applications: Permit Type Application Date Total Facility Operating Permit 6/14/1995 Cold Spring Granite 6/15/1996 Granit-Bronze Foundry Total Facility Operating Permit (revised) 2/08/2001 Cold Spring Granite and Granit- Bronze Foundry combined Major Amendment 2/08/2001 (issued 10/22/01) This permit 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: Federal; Part 70/True Minor for NSR Issue Date: December 4, 2002 Expiration: December 4, 2007 All Title I Conditions do not expire. Ann M. Foss, Manager Majors Air and Construction Section Majors and Remediation Division for Karen A. Studders Commissioner Minnesota Pollution Control Agency TDD (for hearing and speech impaired only): (651) 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 Table A: Limits and Other Requirements Table B: Submittals Table C: Compliance Schedule Appendix A: not used in this permit Appendix B: VOC and HAP Emission Factors for Pouring/Cooling/Shakeout Appendix C: VOC and HAP Evaporation Rates for Sand/Resin/Catalyst Mixing Appendix D: Insignificant Activities Required to be Listed

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 (651) Outside Metro Area TTY (651) 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: Cold Spring Granite Company operates four dimensional granite fabrication facilities in Cold Spring, Minnesota: Main Plant, Granite South, Granite East, and Granite West. The source also includes a bronze foundry and finishing operations. Granite blocks from across the United States and Canada are brought to one of the three granite fabrication plants (Main Plant, Granite East, or Granite West) by truck or rail. At these facilities, the granite blocks are cut into slabs. The slabs are then processed into the desired product, including building materials and monuments. Water is used in most of the fabrication processes. The water used is treated for suspended solids at water treatment facilities located at Granite West and Main Plant. MAIN PLANT The majority of the granite processing and related emission-producing activities take place at the Main Plant. Granite slabs are also brought to the Main Plant from Granite East. At the Main Plant, the granite slabs are further cut into building materials and markers. The waste granite is sent to the Granite South facility for further processing or shipped off-site to an outside company for crushing. Waste material is specified as granite material that is not of sufficient size or quality for finishing into dimensional products.

4 Other operations that take place at the Main Plant facility include the following: diamond tool fabrication, maintenance and modification of machinery, painting of miscellaneous parts, bundling, mobile equipment maintenance, and reclaiming of emery (silicon carbide). GRANITE WEST Besides receiving granite slabs from the Granite East facility, the Granite West facility also receives granite blocks and cuts them into slabs using diamond circular saws or steel shot gang saws. The slabs are then finished into dimensional products. The waste granite is handled the same as that at the Main Plant. Granite West also includes the new Monuwest and Shot Saw buildings, and the finishing operations for the Foundry. In the future, the foundry operations themselves will also be located at the west facility, and the current foundry will be permanently closed. GRANITE EAST Granite East receives granite blocks and cuts them into slabs using wire saws. The slabs are transported to the Main Plant, Granite West, or Granite South for finishing into the desired product. GRANITE SOUTH The Granite South facility accepts suitable granite waste material for splitting into split facility and paving blocks. The facility also accepts granite slabs from Granite East for flame finishing (for purposes of texturing the surface) before splitting them into either split facing or paving products. OLD FOUNDRY -- The foundry operation consists of electric induction furnaces used for melting bronze. Bronze castings are made using sand molds. Castings are finished using various blasting, grinding, and other finishing equipment located at the Granite West facility. In the future, the foundry operations will be relocated to the Granite West facility, and the current, old foundry will be permanently shut down. Particulate emissions throughout the facility are mostly attributable to the sand blast, emery reclaim, and grinding operations. VOC and HAP emissions are mostly attributable to painting, sandblast stencil stripping and emery wheel and brick fabricating at the Main Plant, and paint and sand binder usage at the foundry.

5 TABLE A: LIMITS AND OTHER REQUIREMENTS 12/04/02 Permit Number: 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 Why to do it Permanent Shutdown (Equipment Removal or Dismantlement) of Existing Foundry: Within 270 days of start-up of the new foundry, the existing foundry located at 93 Main Street (known as Granit-Bronze Foundry) shall be permanently shut down. The following emission units identified in the permit make up the "existing foundry:" EU077 through EU085, EU087, and EU093. The following emission units identified in the permit make up the "new foundry:" EU057 through EU066, EU068 through EU070, EU086, and EU097 through EU102. OPERATIONAL REQUIREMENTS 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, unless otherwise noted in Table A. Operation and Maintenance Plan: Retain at the stationary source an operation and maintenance plan for all air pollution control equipment. At a minimum, the O & M plan shall identify all air pollution control equipment and shall include a preventative maintenance program for that equipment, a description of (the minimum but not necessarily the only) corrective actions to be taken to restore the equipment 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 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. PERFORMANCE TESTING Performance Testing: Conduct all performance tests in accordance with Minn. R. ch unless otherwise noted in Tables A, B, and/or C. Limits set as a result of a performance test (conducted before or after permit issuance) apply until superseded as specified by Minn. R following formal review of a subsequent performance test on the same unit. MONITORING REQUIREMENTS Monitoring Equipment Installation: If the required monitoring equipment does not currently exist at the facility, it shall be installed and operational within 60 days of permit issuance. Monitoring Equipment Calibration: Annually calibrate all required monitoring equipment (any requirements applying to continuous emission monitors are listed separately in this permit). Title I Condition: To avoid classification of previous modification as a major source under 40 CFR Section and Minn. R (I/O permit issued 10/22/01) Minn. R Minn. R , subp. 2; Minn. R , subp. 16(J) Minn. R , subp. 14 and Minn. R , subp. 16(J) Minn. R , subp. 4 Minn. R Minn. R Minn. R , subp. 9(A) Minn. R , subp. 16 Minn. R. ch Minn. R Minn. R , subp. 4 Minn. R , subp. 4(D) A-1

6 TABLE A: LIMITS AND OTHER REQUIREMENTS 12/04/02 Permit Number: Operation of Monitoring Equipment: Unless otherwise noted in Tables A, B, and/or C, monitoring a process or control equipment connected to that process is not necessary during periods when the process is shutdown, or during checks of the monitoring systems, such as calibration checks and zero and span adjustments. If monitoring records are required, they should reflect any such periods of process shutdown or checks of the monitoring system. RECORDKEEPING Record keeping: 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. 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 owner or operator 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 owner or operator. However, notification is not required in the circumstances outlined in Items A, B and C of Minn. R , subp. 2. Minn. R , subp. 4(D) Minn. R , subp. 5(C) Minn. R , subp. 5(B) 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. Notification of Deviations Endangering Human Health or the Environment: As soon Minn. R , subp. 1 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: Minn. R , subp. 1 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. Extension Requests: The Permittee may apply for an Administrative Amendment Minn. R , subp. 1(H) 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). Application for Permit Amendment: If a permit amendment is needed, submit an Minn. R through Minn. R application in accordance with the requirements of Minn. R through Minn. R Submittal dates vary, depending on the type of amendment needed. Emission Inventory Report: due 91 days after end of each calendar year following Minn. R through Minn. R permit issuance (April 1). To be submitted on a form approved by the Commissioner. Emission Fees: due 60 days after receipt of an MPCA bill. Minn. R through Minn. R A-2

7 TABLE A: LIMITS AND OTHER REQUIREMENTS 12/04/02 Permit Number: The Permittee is required to submit a Risk Management Plan (RMP) under the federal rule, 40 CFR pt. 68. Each owner or operator of a stationary source, at which a regulated substance is present above a threshold quantity in a process, shall design and implement an accidental release prevention program. A complete RMP must be submitted to the RMP Reporting Center, PO Box 3346, Merrifield, VA RMP submittal information may be obtained at or by calling These requirements must be complied with no later than the latest of the following dates: (1) June 21, 1999; (2) Three years after the date on which a regulated substance is first listed under 40 CFR Section ; or (3) The date on which a regulated substance is first present above a threshold quantity in a process. 40 CFR pt. 68 A-3

8 TABLE A: LIMITS AND OTHER REQUIREMENTS 12/04/02 Permit Number: Subject Item: Associated Items: GP 001 New Foundry VOC Sources EU 057 New Foundry Paint Booth EU 059 New Foundry Mold Shakeout EU 063 New Foundry Sand Mixer #1 EU 065 New Foundry Sand Reclaim - Vibra Mill #1 EU 066 New Foundry Bronze Pouring and Cooling EU 095 New Foundry Sand Reclaim - VibraMill #2 EU 096 New Foundry Sand Reclaim - Thermal Unit EU 097 New Foundry Sand Mixer #2 EU 098 New Foundry Sand Mixer #3 EMISSION LIMITS What to do Why to do it HAPs - Total: less than or equal to 24 tons/year using 12-month Rolling Sum, to be calculated as described in this permit by the 15th day of each month for the previous 12 month period. Calculations shall include all HAP emissions from the sources listed in GP001, except products of combustion. HAP-Single: less than or equal to 9 tons/year using 12-month Rolling Sum, to be calculated as described in this permit by the 15th day of each month for the previous 12 month period. Calculations shall include all individual HAP emissions from the sources listed in GP001, except products of combustion. RECORDKEEPING Daily Recordkeeping: Each day, record the quantity and HAP content of each HAP-containing material used. Recordkeeping: HAP-containing materials Title I Condition: To avoid classification of modification as major under 40 CFR Sections to (I/O permit issued 10/22/01) Title I Condition: To avoid classification of modification as major under 40 CFR Sections to (I/O permit issued 10/22/01) Title I Condition: To avoid classification of modification as major under 40 CFR Sections to Minn. R , subp. 4 and 5 By the 15th day of each month, the Permittee shall determine and record the following: 1. The amount of each HAP containing material used during the previous month 2. The HAP content of each HAP containing material used during the previous month. HAP Content: The HAP content of all materials shall be determined by the Material Safety Data Sheet (MSDS) or Certificate of Analysis (COA) provided by the supplier of each material used. If the MSDS or COA gives the HAP content as a range, the highest humber in the range shall be used for all permit calculations. Alternative methods approved by the MPCA may be used to determine the HAP content. The MPCA reserves the right to require the Permittee to determine the HAP content of any material according to EPA and/or ASTM reference methods. If an EPA or ASTM reference method is used for material content determination, the data obtained shall supersede the MSDS or COA data. A copy of the MSDS, COA, or other record of the HAP content shall be kept at the facility. CALCULATIONS Calculations: Single HAP Emissions Minn. R , subp. 4 and 5 Minn. R , subp. 4 and 5 Monthly HAP emissions shall be calculated as follows: HAP(NF) = HAP(FPB) + HAP(NFPCS) + HAP(NFM) Where: HAP(NF) = total emissions of the HAP (new foundry) for the previous month, in tons HAP(FPB) = Single HAP emissions from operation of the foundry paint booth, in tons, calculated as shown below HAP(NFPCS) = Single HAP emissions from pouring, cooling, and shakeout, (new foundry only) in tons, calculated as shown below HAP(NFM) = Single HAP emissions from the sand and binder mixing operation (new foundry only), in tons, calculated as shown below The 12-month rolling sum of each individual HAP shall be calculated by summing the values of HAP(NF) calculated for each individual HAP during each of the previous 12 months. A-4

9 TABLE A: LIMITS AND OTHER REQUIREMENTS 12/04/02 Permit Number: Calculations: HAP(FPB) Minn. R , subp. 4 and 5 HAP(FPB) = [ (P1 x D1 x H1) + (P2 x D2 x H2) +... ] / 2000 where P1, P2, etc. = quantity of each individual paint or cleaning solvent used at the new foundry during the previous month, gallons D1, D2, etc. = density of each individual paint or cleaning solvent used at the new foundry during the previous month, pounds per gallon H1, H2, etc. = HAP content (individual HAP, by weight) of each individual paint or cleaning solvent used at the new foundry during the previous month, percent Calculations: HAP(NFPCS) Minn. R , subp. 4 and 5 HAP(NFPCS) = (B1 x HE1 / 2000) + (B2 x HE2 / 2000) +... etc. where B1, B2, etc. = the quantity of each individual binder used at the new foundry during the previous month (pounds) HE1, HE2, etc. = the emission factor for the HAP for each individual binder used at the new foundry during the previous month (pound/pound) (See Note 1) Calculations: HAP(NFM) Minn. R , subp. 4 and 5 HAP(NFM) = [(R1 x HR1 x HER1 / 2000) + (R2 x HR2 x HER2 / 2000) +... etc.] + [(C1 x HC1 x HEC1 / 2000) + (C2 x HC2 x HEC2 / 2000)... etc.] where, for the NEW FOUNDRY ONLY, R1, R2, etc. = the quantity of resin used in each binder formula during the previous month (pounds) HR1, HR2, etc. = the HAP content of the resin in each binder formula used during the previous month (individual HAP, weight percent) HER1, HER2, etc. = the evaporation rate of the individual HAP for the resin in each binder formula used during the previous month (percent) (See Note 2) C1, C2, etc. = the quantity of catalyst used in each binder formula during the previous month (pounds) HC1, HC2, etc. = the HAP content of the catalyst in each binder formula used during the previous month (individual HAP, weight percent) HEC1, HEC2, etc. = the evaporation rate of the individual HAP for the catalyst in each binder formula used during the previous month (percent) (See Note 2) Calculations: Total HAPs Minn. R , subp. 4 and 5 HAP(NFT) = the sum of the single/individual HAPs (HAP(NF)) for the previous month Calculate the 12-month rolling sum of total HAPs by summing the values of HAP(NFT) calculated during each of the previous 12 months. NOTES NOTE 1: The emission factor for the particular pollutant shall be the manufacturer's emission factor for the binder used as given in the February 8, 2001, Air Emission Permit application for the new foundry (reproduced in Appendix B). If a different binder is used, use the emission factor for the appropriate binder from Appendix B (reproduced from the May 6, 1998 MPCA document "Iron Foundry Emission Calculations Guidance"). If the emission factor for the binders listed in the February 8, 2001, application are changed, the Permittee shall keep a record of the new emission factors and all supporting documentation. The Permittee shall keep records of the binders used, the corresponding emission factors, and all supporting documentation. Any changes to the emission factors used shall be submitted to the MPCA with the annual compliance certification. NOTE 2: Evaporation rates for individual HAPs from resins and catalysts shall be those cited in the May 6, 1996 MPCA document "Iron Foundry Emission Calculations Guidance" (relevant sections reproduced in Appendix C) or from manufacturer's data. If manufacturer's data is used, the Permittee shall keep a record of the data and all supporting documentation. Any changes to the evaporation rate shall be submitted to the MPCA with the annual compliance certification. If no evaporation rate data is available, an evaporation rate of 50% shall be used. Minn. R , subp. 4 and 5 Minn. R , subp. 4 and 5 The Permittee may propose to use a resin or catalyst-specific evaporation rate derived from MCPA approved performance tests. If approved by the MPCA, this resin or catalyst-specific evaporation rate shall be used. A-5

10 TABLE A: LIMITS AND OTHER REQUIREMENTS 12/04/02 Permit Number: Subject Item: Associated Items: GP 002 HAP Sources EU 001 Wheel Plant Oven EU 002 Wheel Plant Mixer Molder EU 003 M & W Paint Booth EU 057 New Foundry Paint Booth EU 059 New Foundry Mold Shakeout EU 063 New Foundry Sand Mixer #1 EU 065 New Foundry Sand Reclaim - Vibra Mill #1 EU 066 New Foundry Bronze Pouring and Cooling EU 080 Old Foundry Pouring/Cooling EU 082 Old Foundry Sand Handling/Mixing EU 083 Old Foundry Shakeout EU 084 Old Foundry Sand Reclaim EU 086 Core Molding EU 093 Old Foundry Sand Heater/Cooler EU 095 New Foundry Sand Reclaim - VibraMill #2 EU 096 New Foundry Sand Reclaim - Thermal Unit EU 097 New Foundry Sand Mixer #2 EU 098 New Foundry Sand Mixer #3 EMISSION LIMITS What to do Why to do it HAPs - Total: less than or equal to 23.7 tons/year using 12-month Rolling Sum, to be calculated as described in this permit by the 15th day of each month for the previous 12 month period. Calculations shall include all HAP emissions from the sources listed in GP002, except any HAP emissions due to the combustion of fuel in any unit. HAP-Single: less than or equal to 9 tons/year using 12-month Rolling Sum, to be calculated as described in this permit by the 15th day of each month for the previous 12 month period. Calculations shall include all individual HAP emissions from the sources listed in GP002, except any HAP emissions due to the combustion of fuel in any unit. RECORDKEEPING Daily Recordkeeping: Each day, record the quantity and HAP content of each HAP-containing material used. Recordkeeping: HAP-containing materials Title I Condition: To avoid classification as a major source under 40 CFR Section 63.2 Title I Condition: To avoid classification as a major source under 40 CFR Section 63.2 Title I Condition: To avoid classification as a major source under 40 CFR Section 63.2 Minn. R , subp. 4 and 5 By the 15th day of each month, the Permittee shall determine and record the following: 1. The amount of each HAP containing material used during the previous month 2. The HAP content of each HAP containing material used during the previous month. HAP Content: The HAP content of all materials shall be determined by the Material Safety Data Sheet (MSDS) or Certificate of Analysis (COA) provided by the supplier of each material used. If the MSDS or COA gives the HAP content as a range, the highest humber in the range shall be used for all permit calculations. Alternative methods approved by the MPCA may be used to determine the HAP content. The MPCA reserves the right to require the Permittee to determine the HAP content of any material according to EPA and/or ASTM reference methods. If an EPA or ASTM reference method is used for material content determination, the data obtained shall supersede the MSDS or COA data. A copy of the MSDS, COA, or other record of the HAP content shall be kept at the facility. CALCULATIONS Calculations: Single HAP Emissions Minn. R , subp. 4 and 5 Minn. R , subp. 4 and 5 For each individual HAP, monthly emissions shall be calculated as described for GP001, except that all emission sources listed in GP002 shall be included (whereas GP001 includes only the sources located at the new foundry). A-6

11 TABLE A: LIMITS AND OTHER REQUIREMENTS 12/04/02 Permit Number: Calculations: Total HAPs For total HAPs, monthly emissions shall be calculated as described for GP001, except that all emission sources listed in GP002 shall be included (whereas GP001 includes only the sources located at the new foundry). NOTES NOTE 1: The emission factor for the particular pollutant shall be the manufacturer's emission factor for the binder used as given in the February 8, 2001, Air Emission Permit application for the new foundry (reproduced in Appendix B). If a different binder is used, use the emission factor for the appropriate binder from Appendix B (reproduced from the May 6, 1998 MPCA document "Iron Foundry Emission Calculations Guidance"). If the emission factor for the binders listed in the February 8, 2001, application are changed, the Permittee shall keep a record of the new emission factors and all supporting documentation. The Permittee shall keep records of the binders used, the corresponding emission factors, and all supporting documentation. Any changes to the emission factors used shall be submitted to the MPCA with the annual compliance certification. NOTE 2: Evaporation rates for individual HAPs from resins and catalysts shall be those cited in the May 6, 1996 MPCA document "Iron Foundry Emission Calculations Guidance" (relevant sections reproduced in Appendix C) or from manufacturer's data. If manufacturer's data is used, the Permittee shall keep a record of the data and all supporting documentation. Any changes to the evaporation rate shall be submitted to the MPCA with the annual compliance certification. If no evaporation rate data is available, an evaporation rate of 50% shall be used. Minn. R , subp. 4 and 5 Minn. R , subp. 4 and 5 Minn. R , subp. 4 and 5 The Permittee may propose to use a resin or catalyst-specific evaporation rate derived from MCPA approved performance tests. If approved by the MPCA, this resin or catalyst-specific evaporation rate shall be used. A-7

12 TABLE A: LIMITS AND OTHER REQUIREMENTS 12/04/02 Permit Number: Subject Item: GP 003 Main Plant Sandblast Operations Associated Items: EU 009 Marker Dept. Sandblast Booth #1 EU 010 Main Sandblast Booth #1 EU 011 Main Plant Sandblast #2 EU 012 Main Plant Sandblast #3 EU 071 Marker Dept. Sandblast Booth #2 EU 072 Marker Dept. Sandblast Booth #3 EU 073 Marker Dept. Sandblast Booth #4 EU 074 Marker Dept. Sandblast Booth #5 EU 075 Marker Dept. Sandblast Booth #6 EU 076 Marker Dept. Sandblast Booth #7 EMISSION LIMITS What to do Why to do it Total Particulate Matter: less than or equal to 0.3 grains/dry standard cubic foot of exhaust gas unless required to further reduce emissions to comply with the less stringent limit of either Minn R or Minn. R This limit applies individually to each unit listed in GP003. Opacity: less than or equal to 20 percent opacity This limit applies individually to each unit listed in GP003. CONTROL REQUIREMENTS (CE017, CE018, CE019) The Permittee shall operate and maintain each fabric filter at all times that the associated process equipment listed in GP003 is operating. Total Particulate Matter: greater than or equal to 99 percent control efficiency (See GP015 for control equipment monitoring and maintenance requirements) Particulate Matter < 10 micron: greater than or equal to 99 percent control efficiency (See GP015 for control equipment monitoring requirements) Minn. R , subp. 1(A) Minn. R , subp. 1(B) Minn. R , subp. 2(A) Minn. R , subp. 1(A) Minn. R , subp. 1(A) A-8

13 TABLE A: LIMITS AND OTHER REQUIREMENTS 12/04/02 Permit Number: Subject Item: Associated Items: GP 004 Monuwest North and West Finishing Equipment EU 054 Monuwest Finishing Operations (North baghouse) EU 055 Monuwest Finishing Operations (West baghouse) EMISSION LIMITS What to do Why to do it Total Particulate Matter: less than or equal to 0.3 grains/dry standard cubic foot of exhaust gas unless required to further reduce emissions to comply with the less stringent limit of either Minn. R or Minn. R This limit applies individually to each unit listed in GP004. Opacity: less than or equal to 20 percent opacity. This limit applies individually to each unit listed in GP004. EMISSION UNIT DESCRIPTION & RECORDKEEPING EU054 includes several sandblasting units from which emissions are collected and routed to a baghouse (CE024) exhausting to the atmosphere. EU055 includes several pieces of cutting and finishing equipment from which emissions are collected and routed to a baghouse (CE025). Finishing equipment from which emissions are not collected or for which collected emissions are exhausted inside the building are considered insignificant activities and are not included in EU054 or EU055. Recordkeeping: The Permittee shall keep a complete description of each piece of equipment described by EU054 and EU055 at any time. The description shall include the manufacturer, model number, capacity, and date of original installation. The description shall also identify each piece of equipment using a unique identification (ID) number. The Permittee shall submit updated versions of these descriptions with the annual equipment list submittal. The Permittee may make changes to the cutting and finishing equipment, provided the changes are in compliance with all permit requirements. Changes allowed may include replacing individual components with similar units, moving or changing the configuration of components and whether they are controlled by the baghouse, or adding new components. If a change would trigger an applicable requirement that is not included in this permit, or would cause the existing emission limit to be unachievable, or would cause the emission of another regulated pollutant (other than particulate matter), the change must go through the appropriate procedures under Minn. R. ch CONTROL REQUIREMENTS (CE024 and CE025) Minn. R , subp. 1(A) Minn. R , subp. 1(B) Minn. R , subp. 5 Minn. R , subp. 5 and 11 CE024 Air Flow Rate: less than or equal to actual cubic feet/minute Minn. Stat , subd. 4a; Minn. R , subp. 9 CE025 Air Flow Rate: less than or equal to actual cubic feet/minute Minn. Stat , subd. 4a; Minn. R , subp. 9 The Permittee shall maintain records of the capacity of the baghouse fan(s) for Minn. R , subp. 5 CE024 and CE025, in actual cubic feet per minute. The Permittee shall operate and maintain each fabric filter at all times that any Minn. R , subp. 2(A) process equipment controlled by the fabric filter is operating. Total Particulate Matter: greater than or equal to 99 percent control efficiency (See Minn. R , subp. 1(A) GP015 for control equipment monitoring and maintenance requirements) Particulate Matter < 10 micron: greater than or equal to 99 percent control Minn. R , subp. 1(A) efficiency (See GP015 for control equipment monitoring and maintenance requirements) A-9

14 TABLE A: LIMITS AND OTHER REQUIREMENTS 12/04/02 Permit Number: Subject Item: Associated Items: GP 005 Main Plant Cutting Operations EU 007 Main Plant Hand Cutters (N, 5 stations) EU 008 Main Plant Hand Cutter (S, 14 stations) EMISSION LIMITS What to do Why to do it Total Particulate Matter: less than or equal to 0.3 grains/dry standard cubic foot of exhaust gas unless required to further reduce emissions to comply with the less stringent limit of either Minn R or Minn. R This limit applies to each unit listed in GP005. Opacity: less than or equal to 20 percent opacity except for one six-minute period per hour of not more than 60 percent opacity. This limit applies to each unit listed in GP005. EMISSION UNIT DESCRIPTION & RECORDKEEPING EU007 includes several pieces of granite cutting equipment from which emissions are collected and routed to a baghouse (CE017) exhausting to the atmosphere. EU008 includes several pieces of granite cutting equipment from which emissions are collected and routed to a baghouse (CE018). Cutting equipment from which emissions are not collected or for which collected emissions are exhausted inside the building are considered insignificant activities and are not included in EU007 or EU008. Recordkeeping: The Permittee shall keep a complete description of each piece of equipment described by EU007 and EU008 at any time. The description shall include the manufacturer, model number, capacity, and date of original installation. The description shall also identify each piece of equipment using a unique identification (ID) number. The Permittee shall submit updated versions of these descriptions with the annual equipment list submittal. The Permittee may make changes to the finishing equipment, provided the changes are in compliance with all permit requirements. Changes allowed may include replacing individual components with similar units, moving or changing the configuration of components and whether they are controlled by the baghouse, or adding new components. Minn. R , subp. 1(A) Minn. R , subp. 1(B) Minn. R , subp. 5 Minn. R , subp. 5 and 11 If a change would trigger an applicable requirement that is not included in this permit, or would cause the existing emission limit to be unachievable, or would cause the emission of another regulated pollutant (other than particulate matter), the change must go through the appropriate procedures under Minn. R. ch EU007 Capacity: less than or equal to 5670 lbs/hour Minn. Stat , subd. 4a; Minn. R , subp. 9 EU008 Capacity: less than or equal to 3188 lbs/hour Minn. Stat , subd. 4a; Minn. R , subp. 9 CONTROL REQUIREMENTS (CE017 and CE018) The operation of CE017 and CE018 is not necessary in order for these processes to meet applicable emission limits. However, the Permittee wishes to take credit for control for the purpose of reporting actual emissions for the annual emission inventory. Therefore, in order for the PM and PM10 to be considered controlled by CE017 or CE018 for the purpose of the emission inventory, CE017 and CE018 must comply with the requirements of GP015 during the time credit for control is taken. The PM and PM10 generated during that time shall be considered controlled, and the control efficiency used is the limit given below. Total Particulate Matter: greater than or equal to 99 percent collection efficiency (See GP015 for control equipment monitoring and maintenance requirements) Particulate Matter < 10 micron: greater than or equal to 99 percent collection efficiency (See GP015 for control equipment monitoring and maintenance requirements) Minn. Stat , subd. 4a; Equipment used under Minn. R (F) Minn. Stat , subd. 4a; Equipment used under Minn. R (F) Minn. Stat , subd. 4a; Equipment used under Minn. R (F) A-10

15 TABLE A: LIMITS AND OTHER REQUIREMENTS 12/04/02 Permit Number: Subject Item: Associated Items: GP 006 Shot Saws (Controlled) EU 056 Shot Saw 1 (Granite West) EU 088 Shot Saw 2 (Granite West) EU 089 Shot Saw 3 (Granite West) EU 090 Shot Saw 4 (Granite West) EU 091 Shot Saw 5 (Granite West) EU 092 Shot Saw 6 (Granite West) EMISSION LIMITS What to do Why to do it Total Particulate Matter: less than or equal to 0.3 grains/dry standard cubic foot of exhaust gas unless required to further reduce emissions to comply with the less stringent limit of either Minn. R or Minn. R This limit applies individually to each unit listed in GP006. Opacity: less than or equal to 20 percent opacity. This limit applies individually to each unit listed in GP006. CONTROL REQUIREMENTS (CE026) The operation of CE026 is not necessary in order for this process to meet applicable emission limits. However, the Permittee wishes to take credit for its operation for the purpose of reporting actual emissions for the annual emission inventory. Therefore, in order for the PM and PM10 to be considered controlled by CE026 for the purpose of the emission inventory, CE026 must comply with the requirements of GP016 during the time credit for control is taken. The PM and PM10 generated during that time shall be considered controlled, and the control efficiency used is the limit given below. Total Particulate Matter: greater than or equal to 90 percent control efficiency (See GP016 for control equipment monitoring and maintenance requirements) Particulate Matter < 10 micron: greater than or equal to 90 percent control efficiency (See GP016 for control equipment monitoring and maintenance requirements) Minn. R , subp. 1(A) Minn. R , subp. 1(B) Minn. Stat , subd. 4a; Equipment used under Minn. R (F) Minn. Stat , subd. 4a; Equipment used under Minn. R (F) Minn. Stat , subd. 4a; Equipment used under Minn. R (F) A-11

16 TABLE A: LIMITS AND OTHER REQUIREMENTS 12/04/02 Permit Number: Subject Item: Associated Items: GP 007 Sand Handling & Storage - New Foundry EU 059 New Foundry Mold Shakeout EU 063 New Foundry Sand Mixer #1 EU 064 New Foundry Sand Silo #1 EU 065 New Foundry Sand Reclaim - Vibra Mill #1 EU 086 Core Molding EU 095 New Foundry Sand Reclaim - VibraMill #2 EU 097 New Foundry Sand Mixer #2 EU 098 New Foundry Sand Mixer #3 EU 099 New Foundry Sand Silo #2 EU 100 New Foundry Sand Silo #3 EU 101 New Foundry Sand Silo #4 EU 102 New Foundry Sand Silo #5 EMISSION LIMITS What to do Why to do it Total Particulate Matter: less than or equal to 0.3 grains/dry standard cubic foot of exhaust gas unless required to further reduce emissions to comply with the less stringent limit of either Minn R or Minn. R This limit applies individually to each unit listed in GP007. Opacity: less than or equal to 20 percent opacity This limit applies individually to each unit listed in GP007. CONTROL REQUIREMENTS (CE014, CE012, CE031) The Permittee shall operate and maintain the fabric filter at all times that any process equipment controlled by the fabric filter is operating. Total Particulate Matter: greater than or equal to 99 percent control efficiency (See GP015 for control equipment monitoring and maintenance requirements) Particulate Matter < 10 micron: greater than or equal to 99 percent control efficiency (See GP015 for control equipment monitoring and maintenance requirements) Minn. R , subp. 1(A) Minn. R , subp. 1(B) Minn. R , subp. 2(A) Minn. R , subp. 1(A) Minn. R , subp. 1(A) A-12

17 TABLE A: LIMITS AND OTHER REQUIREMENTS 12/04/02 Permit Number: Subject Item: GP 008 New Foundry Wheelabrators Associated Items: EU 061 New Foundry Wheelabrator #1 EU 062 New Foundry Wheelabrator #2 EMISSION LIMITS What to do Why to do it Total Particulate Matter: less than or equal to 0.3 grains/dry standard cubic foot of exhaust gas unless required to further reduce emissions to comply with the less stringent limit of either Minn R or Minn. R This limit applies individually to each unit listed in GP008. Opacity: less than or equal to 20 percent opacity This limit applies individually to each unit listed in GP008. CONTROL REQUIREMENTS (CE013) The Permittee shall operate and maintain the fabric filter at all times that any process equipment controlled by the fabric filter is operating. Total Particulate Matter: greater than or equal to 99 percent control efficiency (See GP015 for control equipment monitoring and maintenance requirements) Particulate Matter < 10 micron: greater than or equal to 99 percent control efficiency (See GP015 for control equipment monitoring and maintenance requirements) Minn. R , subp. 1(A) Minn. R , subp. 1(B) Minn. R , subp. 2(A) Minn. R , subp. 1(A) Minn. R , subp. 1(A) A-13

18 TABLE A: LIMITS AND OTHER REQUIREMENTS 12/04/02 Permit Number: Subject Item: GP 009 New Foundry Melting/Pouring/Cooling Associated Items: EU 060 New Foundry Induction Furnace #1 EU 066 New Foundry Bronze Pouring and Cooling EU 068 New Foundry Induction Furnace #2 EU 069 New Foundry Induction Furnace #3 EU 070 New Foundry Induction Furnace #4 EMISSION LIMITS What to do Why to do it Total Particulate Matter: less than or equal to 0.3 grains/dry standard cubic foot of exhaust gas unless required to further reduce emissions to comply with the less stringent limit of either Minn. R or Minn. R This limit applies individually to each unit listed in GP009. Opacity: less than or equal to 20 percent opacity except for one six-minute period per hour of not more than 60 percent opacity. This limit applies individually to each unit listed in GP009. CONTROL REQUIREMENTS (CE012) The Permittee shall operate and maintain each fabric filter at all times that any process equipment controlled by the fabric filter is operating. Total Particulate Matter: greater than or equal to 99 percent control efficiency Particulate Matter < 10 micron: greater than or equal to 99 percent control efficiency Minn. R , subp. 1(A)(1) Minn. R , subp. 1(A)(2) Minn. R , subp. 2(A) Minn. R , subp. 1(A) Minn. R , subp. 1(A) A-14

19 TABLE A: LIMITS AND OTHER REQUIREMENTS 12/04/02 Permit Number: Subject Item: Associated Items: GP 011 Sand Handling & Storage - Old Foundry (controlled) EU 081 Old Foundry Silo Sand Transport EU 083 Old Foundry Shakeout EU 084 Old Foundry Sand Reclaim EU 087 Old Foundry Roof Sand Transport EU 093 Old Foundry Sand Heater/Cooler EMISSION LIMITS What to do Why to do it Total Particulate Matter: less than or equal to 0.3 grains/dry standard cubic foot of exhaust gas unless required to further reduce emissions to comply with the less stringent limit of either Minn R or Minn. R This limit applies individually to each unit listed in GP011. Opacity: less than or equal to 20 percent opacity This limit applies individually to each unit listed in GP011. CONTROL REQUIREMENTS (CE028, CE029 & CE030) The Permittee shall operate and maintain the filters at all times that any process equipment controlled by the filter is operating. Pressure Drop: greater than or equal to 1 inches of water column and less than or equal to 6 inches of water column, unless a new range is set pursuant to Minn. R , subp. 3, based on the values recorded during the most recent MPCA approved performance test where compliance was demonstrated. Visible Emissions: The Permittee shall check the stack each filter (CE028, CE029, CE030) for any visible emissions once each day of operation during daylight hours. During inclement weather, the Permittee shall read and record the pressure drop across the fabric filter, once each day of operation. Total Particulate Matter: greater than or equal to 99 percent control efficiency Particulate Matter < 10 micron: greater than or equal to 99 percent control efficiency Recordkeeping of Visible Emissions and Pressure Drop. The Permittee shall record the time and date of each visible emission inspection and pressure drop reading, and whether or not any visible emissions were observed, and whether or not the observed pressure drop was within the range specified in this permit. Periodic Inspections: At least once per calendar quarter, or more frequently as required by the manufacturing specifications, the Permittee shall inspect the control equipment components. The Permittee shall maintain a written record of these inspections. Corrective Actions: The Permittee shall take corrective action as soon as possible if any of the following occur: - the recorded pressure drop is outside the required operating range; or - the fabric filter or any of its components are found during the inspections to need repair. Corrective actions shall return the pressure drop to within the permitted range and/or include completion of necessary repairs identified during the inspection, as applicable. Corrective actions include, but are not limited to, those outlined in the O & M Plan for the equipment. The Permittee shall keep a record of the type and date of any corrective action taken. Minn. R , subp. 1(A) Minn. R , subp. 1(B) Minn. R , subp. 2(A) Minn. R Minn. R , subp. 2; MInn. R , subp. 4, 5, and 14 Minn. R , subp. 1(A) Minn. R , subp. 1(A) Minn. R , subp. 2; MInn. R , subp. 4, 5, and 14 Minn. R , subp. 2; MInn. R , subp. 4, 5, and 14 Minn. R , subp. 2; MInn. R , subp. 4, 5, and 14 A-15

20 TABLE A: LIMITS AND OTHER REQUIREMENTS 12/04/02 Permit Number: Subject Item: GP 012 Old Foundry Melting/Pouring/Cooling Associated Items: EU 077 Old Foundry Induction Furnace #1 EU 078 Old Foundry Induction Furnace #2 EU 079 Old Foundry Induction Furnace #3 EU 080 Old Foundry Pouring/Cooling EMISSION LIMITS What to do Why to do it Total Particulate Matter: less than or equal to 0.3 grains/dry standard cubic foot of exhaust gas unless required to further reduce emissions to comply with the less stringent limit of either Minn. R or Minn. R This limit applies individually to each unit listed in GP011. Opacity: less than or equal to 20 percent opacity except for one six-minute period per hour of not more than 60 percent opacity. TESTING REQUIREMENTS Performance Test: due 365 days after Permit Issuance to measure Total Particulate Matter and opacity from the stack exhausting emissions from the units in GP012 (SV036). Performance Test Notifications and Submittals: Performance Tests are due as outlined in Tables A and B of the permit. See Table B for additional testing requirements. Minn. R , subp. 1(A)(1) Minn. R , subp. 1(A)(2) Minn. R , subp. 1 Minn. R , subp. 1-4 and Minn. R , subp. 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 - Microfiche Copy: due 105 days after each Performance Test A-16