AIR EMISSION PERMIT NO Administrative Amendment IS ISSUED TO. Cargill Inc & Buffalo lake Energy LLC

Transcription

1 AIR EMISSION PERMIT NO Administrative Amendment IS ISSUED TO Cargill Inc & Buffalo lake Energy LLC CARGILL AGHORIZONS 1005 Bixby Road Fairmont, Martin County, MN BUFFALO LAKE ENERGY LLC 1125 Bixby Road Fairmont, Martin County, MN The emission units, control equipment and emission stacks at the stationary source authorized in this permit amendment are as described in the Permit Applications Table. This permit amendment supersedes Air Emission Permit No and authorizes the Permittee to operate and modify 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. Unless otherwise indicated, all the Minnesota rules cited as the origin of the permit terms are incorporated into the State Implementation Plan under 40 CFR and as such are enforceable by U.S. Environmental Protection Agency (EPA) Administrator or citizens under the Clean Air Act. Permit Type: State; Limits to Avoid Pt 70/Limits to Avoid NSR; Operating Permit Issue Date: 8/24/2006 Administrative Amendment Issue Date: October 27, 2009 Expiration Date: 08/24/2011 Don Smith, P.E., Manager Air Quality Permits Section Industrial Division for Paul Eger 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 Permit Applications Table Permit Type Application Date Permit Action Total Facility Operating Permit 10/ Major Amendment 07/08/ Administrative Amendment 09/17/

3 TABLE OF CONTENTS Notice to the Permittee Permit Shield Facility Description Amendment Description Table A: Limits and Other Requirements Table B: Submittals Appendices

4 NOTICE TO THE PERMITTEE: Your stationary source may be subject to the requirements of the Minnesota Pollution Control Agency s (MPCA) solid waste, hazardous waste, and water quality programs. If you wish to obtain information on these programs, including information on obtaining any required permits, please contact the MPCA general information number at: Metro Area Outside Metro Area TTY The rules governing these programs are contained in Minn. R. chs Written questions may be sent to: Minnesota Pollution Control Agency, 520 Lafayette Road North, St. Paul, Minnesota Questions about this air emission permit or about air quality requirements can also be directed to the telephone numbers and address listed above. PERMIT SHIELD: Subject to the limitations in Minn. R , compliance with the conditions of this permit shall be deemed compliance with the specific provision of the applicable requirement identified in the permit as the basis of each condition. Subject to the limitations of Minn. R and , subp. 2, notwithstanding the conditions of this permit specifying compliance practices for applicable requirements, any person (including the Permittee) may also use other credible evidence to establish compliance or noncompliance with applicable requirements.

5 FACILITY DESCRIPTION: Cargill AgHorizons (Cargill) supports Biofuel Solutions BLE (BLE) facility in providing grain required to operate an adjacent new fuel-grade ethanol production plant in Fairmont, Minnesota. BLE is proposing a design capacity of 110 million gallons of undenatured ethanol with a maximum design capacity of 118 million gallons of undenatured ethanol or million gallons of denatured ethanol on an annual basis. The Cargill site will increase its throughput of corn in order to supply the ethanol plant. Cargill will receive and store the necessary 43.7 million bushels of grain per year for the ethanol facility in existing grain silos. An enclosed conveying system will transport the grain from the silos to the ethanol facility for processing. The Cargill grain elevator and the new ethanol facility will jointly have controlled emissions less than 95 tons per year for each criteria pollutant. Therefore, the elevator and the ethanol facility will be a synthetic minor source with respect to both Title V permitting and New Source Review. AMENDMENT DESCRIPTION: Permit Action 002: This major amendment application requests the addition of two alternate operating scenarios for the equipment at the Cargill facility as well as increased truck traffic limits based on a major amendment BLE recently submitted to the MPCA. The alternate operating scenario for the plant will allow for grain shipping via rail and truck while the ethanol process is not running (i.e., hammermills and cooling towers are not operating). Implementing this alternate operating scenario will require the addition of conditions to Cargill s existing air permit (No ), including the addition of the rail and truck shipping operations when the ethanol manufacturing plant is down. This will not affect the permit conditions in the BLE air permit. Based on the air dispersion modeling, Cargill and BLE will not cause or significantly contribute to an exceedance of the Prevention of Significant Deterioration Program increments or National Ambient Air Quality Standard. BLE and Cargill will remain a synthetic minor source with respect to Title V permitting and new source review. This application proposes two alternate operating scenarios for the emission sources at Cargill. These operating scenarios are described in detail below. Alternate operating Scenario No. 1: In this operating scenario, the Cargill facility will ship up to 450,000 bushels of corn per day via rail (FS104 and SV104) while BLE ethanol manufacturing operations are down (i.e., cooling towers and hammermills are not operating). All other operations at the ethanol plant may continue to function at the rates proposed in the BLE May 2008 Major Air Permit Amendment application.

6 Alternate operating Scenario No. 2: In this operating scenario the Cargill will ship up to 50,000 bushels of corn per day via truck (FS005) while BLE operations are down (i.e., cooling towers and hammermills are not operating). All other operations at the ethanol plant may continue to function at the rates proposed in the BLE May 2008 Major Air Permit Amendment application. Increased Truck Traffic Limits: BLE submitted an Air Permit Major Amendment in May 2008 that included changes to the facility s air emission permit including an increase in daily truck traffic volume (FS006 of the air emission permit no ). Stack Parameter Changes: This application also proposes to change stack parameters for the baghouses at the facility (SV002, SV003, and SV004). Permit Action 003: In this permit action the operator of the facility is changed from Cargill Enterprises to Buffalo Lake Energy LLC.

7 TABLE A: LIMITS AND OTHER REQUIREMENTS A-1 10/27/09 Facility Name: Permit Number: Cargill AgHorizons 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 OPERATIONAL REQUIREMENTS hdr Why to do it Process Throughput: less than or equal to tons/year using 12-month Rolling Sum of corn, based on a 56 pound bushel. This is equivalent to 43,703,704 bushels per year. Daily Recordkeeping. On each day of operation, the Permittee shall calculate, record, and maintain the total quantity of grain received at the facility. This shall be based on delivery records. Monthly Recordkeeping - Grain Received. By the 15th of the month, the Permittee shall calculate and record the following: 1) The total tonnage of grain for the previous calendar month using the daily usage records. 2) The tonnage for the previous month. 3) The 12 month rolling sum solids usage for the previous 12 month period by summing the monthly grain tonnage data for the previous 12 months. The Permittee shall comply with National Primary and Secondary Ambient Air Quality Standards, 40 CFR pt. 50, and the Minnesota Ambient Air Quality Standards, Minn. R to Compliance shall be demonstrated upon written request by the MPCA. 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 control practices and shall include a preventative maintenance program for the equipment and practices, a description of (the minimum but not necessarily the only) corrective actions to be taken to restore the equipment and practices to proper operation to meet applicable permit conditions, a description of the employee training program for proper operation and maintenance of the control equipment and practices, and the records kept to demonstrate plan implementation. Operation Changes: In any shutdown, breakdown, or deviation the Permittee shall immediately take all practical steps to modify operations to reduce the emission of any regulated air pollutant. The Commissioner may require feasible and practical modifications in the operation to reduce emissions of air pollutants. No emissions units that have an unreasonable shutdown or breakdown frequency of process or control equipment shall be permitted to operate. Fugitive Emissions: Do not cause or permit the handling, use, transporting, or storage of any material in a manner which may allow avoidable amounts of particulate matter to become airborne. Comply with all other requirements listed in Minn. R Noise: The Permittee shall comply with the noise standards set forth in Minn. R to at all times during the operation of any emission units. This is a state only requirement and is not enforceable by the EPA Administrator or citizens under the Clean Air Act. Inspections: The Permittee shall comply with the inspection procedures and requirements as found in Minn. R , subp. 9(A). The Permittee shall comply with the General Conditions listed in Minn. R , subp. 16. PERFORMANCE TESTING Title I Condition: Limit taken to avoid classification as a major source and modification under 40 CFR Section 52.21; to avoid classification as a major source under 40 CFR Section 70.2 Title I Condition: To avoid classification as a major source and modification under 40 CFR Section 52.21; to avoid classification as a major source under 40 CFR Section 70.2 Minn. R , subp. 4 and 5 40 CFR pt. 50; Minn. Stat. Section , subds. 4a & 9; Minn. R , supbs. 7A, 7L & 7M; Minn. R , subps. 1, 2 & 4; Minn. R 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 hdr Performance Testing: Conduct all performance tests in accordance with Minn. R. ch unless otherwise noted in Tables A and/or B. Minn. R. ch. 7017

8 TABLE A: LIMITS AND OTHER REQUIREMENTS A-2 10/27/09 Facility Name: Cargill AgHorizons Permit Number: 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. Rs , 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 The Notification, Test Plan, and Test Report may be submitted in alternative format as allowed by Minn. R Limits set as a result of a performance test (conducted before or after permit issuance) apply until superseded as specified by Minn. R following formal review of a subsequent performance test on the same unit. Performance Test: due before end of each calendar half-year following Initial Performance Test for paved road silt load. The Initial Performance Test is due by May 15, All subsequent tests shall be performed in January and July of each calendar year. The tests shall be conducted in accordance with EPA guidance in Appendix C.1 and Appendix C.2 of AP42. The permittee shall keep records of silt loading testing. If tested silt loading values together with other paved roads terms (e.g. vehicle weight, vehicle speed) yields PM10 emission factors (pounds per vehicle-mile-traveled, lb/vmt) that are found to be greater than those assumed in the most recent approved modeling, then the road cleaning (sweeping and vacuuming) frequency will be revised so that lb/vmt values are low enough to comport with the most recent approved modeling (December 17, 2008). MONITORING REQUIREMENTS Monitoring Equipment Calibration: Annually calibrate all required monitoring equipment (any requirements applying to continuous emission monitors are listed separately in this permit). Operation of Monitoring Equipment: Unless otherwise noted in Tables A and/or B, 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 Recordkeeping: Retain all records at the stationary source for a period of five (5) years from the date of monitoring, sample, measurement, or report. Records which must be retained at this location include all calibration and maintenance records, all original recordings for continuous monitoring instrumentation, and copies of all reports required by the permit. Records must conform to the requirements listed in Minn. R , subp. 5(A). Recordkeeping: Maintain records describing any insignificant modifications (as required by Minn. R , subp. 3) or changes contravening permit terms (as required by Minn. R subp. 2), including records of the emissions resulting from those changes. When the Permittee determines that no permit amendment or notification is required prior to making a change, the Permittee must retain records of all calculations required under Minn. R For expiring permits, these records shall be kept for a period of five years from the date the change was made or until permit reissuance, whichever is longer. For nonexpiring permits, these records shall be kept for a period of five years from the date that the change was made. The records shall be kept at the stationary source for the current calendar year of operation and may be kept at the stationary source or office of the stationary source for all other years. The records may be maintained in either electronic or paper format. REPORTING/SUBMITTALS Minn. R CFR Section and Minn. R hdr Minn. R , subp. 4(D) Minn. R , subp. 4(D) hdr Minn. R , subp. 5(C) Minn. R , subp. 5(B) Minn. R , subp. 4 hdr

9 TABLE A: LIMITS AND OTHER REQUIREMENTS A-3 10/27/09 Facility Name: Cargill AgHorizons Permit Number: 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. 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. 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. 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). Emission Inventory Report: due on or before April 1 of each calendar year Minn. R through Minn. R following permit issuance. 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 MODELING REQUIREMENTS Parameters Used in Modeling: The parameters used in the modeling performed for an Environmental Assessment Worksheet under Minn. R. ch and for determining emission and/or operational limits, if applicable for this facility are listed in Appendix III of this permit. If the Permittee intends to change any of these parameters, the Permittee must submit the revised parameters to the Commissioner and receive written approval before making any changes. The revised parameter information submittal must include, but is not limited to: the locations, heights and diameters of the stacks; locations and dimensions of nearby buildings; velocity and temperatures of the gases emitted; and the emission rates. The plume dispersion characteristics due to the parameter revisions must equal or exceed the dispersion characteristics modeled for this permit, and the Permittee shall demonstrate this in the proposal. hdr Minn. R ; Minn. R , subp. 2

10 TABLE A: LIMITS AND OTHER REQUIREMENTS A-4 10/27/09 Facility Name: Cargill AgHorizons Permit Number: Parameters Used in Modeling: The stack heights, stack diameters, air flow rates, and exhaust gas temperatures used in the modeling performed for the PSD analysis for this permit are listed in Appendix III of this permit. The Permittee must submit to the Agency for approval any revisions of these parameters that are caused by a physical change or change in the method of operation of the facility and must wait for a written approval before making such changes. The information submitted must include, at a minimum, the locations, heights and diameters of the stacks, locations and dimensions of nearby buildings, the velocity and temperature of the gases emitted, and the PM10 emission rates. The plume dispersion characteristics after the proposed revisions must be equivalent to or better than the dispersion characteristics used in the model dated May 23, The Permittee shall demonstrate this equivalency in the proposal. If the information submitted does not demonstrate equivalent or better dispersion characteristics, or if a conclusion cannot readily be made about the dispersion, the Permittee must remodel. Title I Condition: 40 CFR Section 52.21(k); Minn. R Title I Condition: 40 CFR Section 52.21(k); Minn. R For any physical change to or change in the method of operation of a stack emitting PM10 or for any increase in PM10 emissions (whether or not the increase would require a permit amendment of any type), the Permittee must remodel. For changes that do not involve any increase to any emission rate or any emissions from a new emission point, this proposal must be submitted as soon as practicable, but no less than 60 days before beginning actual construction of the modification, stack, or associated emission unit(s). For changes involving increases in emission rates or emissions from a new emission point and that require a minor permit amendment, the proposal and/or required modeling analysis must be submitted as soon as practicable, but no less than 60 days before beginning actual construction of the modification, stack, or associated emission unit(s). For changes involving increases in emission rates or emissions from a new emission point and that require a permit amendment other than a minor amendment, the proposal and/or modeling analysis must be submitted with the permit application. The Permittee shall install fencing around the facility. The fencing shall be fully installed prior to the start-up of any portion of the facility. In areas where fencing is not permissible by setbacks, right-of-ways, safety concerns, or clearances, the Permittee will commit to installation of signage and patrolling to sufficiently restrict public access to the property outlined as fenced in the dispersion modeling. Title I Condition: 40 CFR Section 52.21(k); Minn. R Minn. R. 7009

11 TABLE A: LIMITS AND OTHER REQUIREMENTS A-5 10/27/09 Facility Name: Cargill AgHorizons Permit Number: Subject Item: Associated Items: GP 001 Baghouses CE 001 Fabric Filter - Low Temperature, i.e., T<180 Degrees F CE 002 Fabric Filter - Low Temperature, i.e., T<180 Degrees F CE 003 Fabric Filter - Low Temperature, i.e., T<180 Degrees F What to do Opacity: less than or equal to 10.0 percent opacity discharged from control equipment. Applies individually to each baghouse. Total Particulate Matter: greater than or equal to 99.0 percent control efficiency. The Permittee shall operate and maintain the fabric filters such that they achieve 99% overall control efficiency. This limit applies to each fabric filter individually. Particulate Matter < 10 micron: greater than or equal to 99.0 percent control efficiency. The Permittee shall operate and maintain the fabric filters such that they achieve 99% overall control efficiency. This limit applies to each fabric filter individually. The Permittee shall operate and maintain the fabric filter at all times that any emission unit controlled by the fabric filter is in operation. The Permittee shall document periods of non-operation of the control equipment. Vent emissions from all units controlled by the baghouses CE001 through CE003, through the baghouses at all times that the associated units are in operation. The Permittee shall maintain each piece of control equipment according to the manufacturer's specification, shall conduct inspections, and maintain documentation of those actions as required by Minn. R , subp. 2(A) to 2(I). 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 required to be set pursuant to Minn. R , subp. 3. If a new range is required to be set, it will be based on the values recorded during the most recent MPCA approved performance test where compliance was demonstrated. The Permittee shall record the pressure drop once every 24 hours when in operation. 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 Visible Emissions: The Permittee shall check the fabric filter stack (SV 001, 002, and 003) 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. Why to do it Minn. R , subp. 3(D) Title I Condition: Limit taken to avoid classification as a major source and modification under 40 CFR Section 52.21; to avoid classification as a major source under 40 CFR Section 70.2 Title I Condition: Limit taken to avoid classification as a major source and modification under 40 CFR Section 52.21; to avoid classification as a major source under 40 CFR Section 70.2 Title I Condition: Limit taken to avoid classification as a major source and modification under 40 CFR Section 52.21; to avoid classification as a major source under 40 CFR Section 70.2; Minn. R , subp. 2 and 14 Minn. R , subp. 2(A) to 2(I) Title I Condition: Limit taken to avoid classification as a major source and modification under 40 CFR Section 52.21; to avoid classification as a major source under 40 CFR Section 70.2; Minn. R , subp. 2 and 14 Title I Condition: Monitoring for Limit taken to avoid classification as a major source and modification under 40 CFR Section 52.21; to avoid classification as a major source under 40 CFR Section 70.2; Minn. R , subp. 4 and 5 Title I Condition: Monitoring for Limit taken to avoid classification as a major source and modification under 40 CFR Section 52.21; to avoid classification as a major source under 40 CFR Section 70.2; Minn. R Corrective Actions: The Permittee shall take corrective action as soon as possible if Minn. R , subp. 4, 5, and 14 any of the following occur: - visible emissions are observed; - 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, eliminate visible emissions, 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 fabric filter. The Permittee shall keep a record of the type and date of any corrective action taken for each filter. Periodic Inspections: At least once per calendar quarter, or more frequently as Minn. R , subp. 4, 5 and 14 required by the manufacturing specifications, the Permittee shall inspect the control equipment components. The Permittee shall maintain a written record of these inspections. Monitoring Equipment: The Permittee shall install and maintain the necessary Minn. R , subp. 4 monitoring equipment for measuring and recording pressure drop as required by this permit. The monitoring equipment must be installed, in use, and properly maintained when the monitored fabric filter is in operation.

12 TABLE A: LIMITS AND OTHER REQUIREMENTS A-6 10/27/09 Facility Name: Cargill AgHorizons Permit Number: Subject Item: Associated Items: GP 002 Grain Receiving FS 002 Truck Receiving FS 003 Rail Receiving What to do BULK AGRICULTURAL COMMODITY FACILITY REQUIREMENTS hdr Why to do it The Permittee shall clean up commodities spilled on the driveway and other facility property as required to minimize fugitive emissions to a level consistent with RACT (reasonably available control technology). Opacity: less than or equal to 5.0 percent opacity for fugitive emissions from grain unloading or grain handling activities Minn. R , subp. 1(A) Minn. R , subp. 3(A)

13 TABLE A: LIMITS AND OTHER REQUIREMENTS A-7 10/27/09 Facility Name: Permit Number: Cargill AgHorizons Subject Item: EU 001 Grain Dryer Associated Items: SV 001 Column Grain Dryer What to do The grain dryer will be decommissioned prior to the start of operations date of the proposed Buffalo Lake Energy ethanol production facility. The electric and gas lines will be disconnected from the unit. This unit will not operate once Buffalo Lake Energy begins operations. Why to do it Title I Condition: To avoid classification as a major source under 40 CFR Section 52.21; to avoid major source classification under 40 CFR Section 70.2 and Minn. R

14 TABLE A: LIMITS AND OTHER REQUIREMENTS A-8 10/27/09 Facility Name: Permit Number: Cargill AgHorizons Subject Item: FS 004 Rail Shipping What to do Process Throughput: less than or equal to 450,000 bu/day of corn loaded into railcars only when the hammermills and cooling tower fans at Buffalo Lake Energy are not operating and when corn is not being shiped by truck from the facility. Daily Recordkeeping. On each calendar day of operation, the Permittee shall record and maintain a record of the total amount of corn loaded into rail cars. Also, the Permittee shall record and maintain a record of the dates and times which corn is being shipped from the facility. Opacity: less than or equal to 5 percent from rail loading stations fugitive emissions. Recordkeeping of Visible Emissions. The Permittee shall check for any visible emissions once each day of operation during daylight hours. The Permittee shall also record the time and date of each visible emission inspection and whether or not any visible emissions were observed. Why to do it Title I Condition: To avoid classification as a major source and modification under 40 CFR Section and Minn. R ; To avoid classification as major source under 40 CFR Section 70.2 and Minn. R Title I Condition: To avoid classification as a major source and modification under 40 CFR Section and Minn. R ; To avoid classification as major source under 40 CFR Section 70.2 and Minn. R Minn. R subp. 3(A) Minn. R , subps. 4 and 5

15 TABLE A: LIMITS AND OTHER REQUIREMENTS A-9 10/27/09 Facility Name: Permit Number: Cargill AgHorizons Subject Item: FS 005 Truck Shipping What to do Process Throughput: less than or equal to 50,000 bu/day of corn loaded into trucks only when the hammermills and cooling tower fans at Buffalo Lake Energy are not operating and when corn is not being shiped by rail from the facility. Daily Recordkeeping. On each calendar day of operation, the Permittee shall record and maintain a record of the total amount of corn loaded into trucks. Also, the Permittee shall record and maintain a record of the dates and times which corn is being shipped from the facility. Opacity: less than or equal to 10.0 percent opacity from truck loading stations fugitive emissions. Recordkeeping of Visible Emissions. The Permittee shall check for any visible emissions once each day of operation during daylight hours. The Permittee shall also record the time and date of each visible emission inspection and whether or not any visible emissions were observed. Why to do it Title I Condition: To avoid classification as a major source and modification under 40 CFR Section and Minn. R ; To avoid classification as major source under 40 CFR Section 70.2 and Minn. R Title I Condition: To avoid classification as a major source and modification under 40 CFR Section and Minn. R ; To avoid classification as major source under 40 CFR Section 70.2 and Minn. R Minn. R , subp. 3(B) Minn. R , subps. 4 and 5

16 TABLE A: LIMITS AND OTHER REQUIREMENTS A-10 10/27/09 Facility Name: Permit Number: Cargill AgHorizons Subject Item: FS 006 Truck Traffic What to do Why to do it Truck Traffic: less than or equal to 280 trucks/day (grain receiving trucks) during the months of April through November. Title I Condition: 40 CFR Section 52.21(k); Minn. R Truck Traffic: less than or equal to 250 trucks/day (grain receiving trucks) during the months of December through March. Title I Condition: 40 CFR Section 52.21(k); Minn. R Recordkeeping: The Permittee shall record the number of grain delivery trucks entering the facility each calendar day and keep these records on-site. Title I Condition: 40 CFR Section 52.21(k); Minn. R Abide by the Fugitive Dust Control Plan in Appendix II. Minn. R

17 TABLE B: SUBMITTALS Facility Name: Cargill AgHorizons Permit Number: Also, where required by an applicable rule or permit condition, send to the Permit Technical Advisor notices of: - accumulated insignificant activities, - installation of control equipment, - replacement of an emissions unit, and - changes that contravene a permit term. B-1 10/27/09 Table B lists most of the submittals required by this permit. Please note that some submittal requirements may appear in Table A or, if applicable, within a compliance schedule located in Table C. Table B is divided into two sections in order to separately list one-time only and recurrent submittal requirements. Each submittal must be postmarked or received by the date specified in the applicable Table. Those submittals required by parts to must be certified by a responsible official, defined in Minn. R , subp. 21. Other submittals shall be certified as appropriate if certification is required by an applicable rule or permit condition. Send submittals that are required to be submitted to the U.S. EPA regional office to: Mr. George Czerniak Air and Radiation Branch EPA Region V 77 West Jackson Boulevard Chicago, Illinois Send any application for a permit or permit amendment to: AQ Permit Technical Advisor Industrial Division Minnesota Pollution Control Agency 520 Lafayette Road North St. Paul, Minnesota Send submittals that are required by the Acid Rain Program to: U.S. Environmental Protection Agency Clean Air Markets Division 1200 Pennsylvania Avenue NW (6204N) Washington, D.C Unless another person is identified in the applicable Table, send all other submittals to: AQ Compliance Tracking Coordinator Industrial Division Minnesota Pollution Control Agency 520 Lafayette Road North St. Paul, Minnesota

18 TABLE B: ONE TIME SUBMITTALS OR NOTIFICATIONS Facility Name: Cargill AgHorizons Permit Number: B-2 10/27/09 What to send When to send Portion of Facility Affected Application for Permit Reissuance due 180 days before expiration of Existing Total Facility Permit

19 TABLE B: RECURRENT SUBMITTALS Facility Name: Cargill AgHorizons Permit Number: B-3 10/27/09 What to send When to send Portion of Facility Affected Semiannual Deviations Report due 30 days after end of each calendar Total Facility half-year starting 08/24/2006. The first semiannual report submitted by the Permittee shall cover the calendar half-year in which the permit is issued. The first report of each calendar year covers January 1 - June 30. The second report of each calendar year covers July 1 - December 31. If no deviations have occured, the Permittee shall submit the report stating no deviations. Compliance Certification due 31 days after end of each calendar year starting 08/24/2006 (for the previous calendar year). To be submitted to the Commissioner on a form approved by the Commissioner. This report covers all deviations experienced during the calendar year. Total Facility

20 APPENDIX MATERIAL Facility Name: Cargill AgHorizons Permit Number: Appendix I Insignificant Activities and Applicable Requirements The table below lists the insignificant activities that are currently at the facility and their associated general applicable requirements. Minn. R , subpart 3(A) 3(E)(1) 3(G) 3(H)(3) 3(H)(4) 3(J) 3(K) Rule Description of the Activity Fuel use: space heaters fueled by natural gas or propane. These space heaters will have less than 30,000 BTU/hr heating capacity. Small gasoline storage tanks (1-10 gallon fuel cans) for lawn mowers and other small equipment, etc. The Facility will have a product testing laboratory. Welding Equipment for plant maintenance Normal-scale office equipment will be present in the facility office. Fugitive Emissions from roads and parking lots. Main facility haul roads will be paved. Unpaved pull-offs may exist but are not used on a regular basis. Infrequent use of spray paint equipment for routine housekeeping or plant upkeep activities not associated with primary production processes at the stationary source, such as spray painting of buildings, machinery, vehicles, and other supporting equipment. Applicable Requirement Minn. R /0515 Minn. R Minn. R /0715

21 Appendix II Haul Roads Fugitive Dust Control Plan Cargill AgHorizons and Buffalo Lake Energy, LLC This document outlines the truck haul road fugitive dust control measures that will be implemented at the proposed Buffalo Lake Energy, LLC (BLE) ethanol production facility. Through the hauling process, fugitive dust is generated from the contact between the roads and the vehicle tires causing the re-suspension of loose material on the road surface. BLE ethanol production facility is proposed to be located next to the existing Cargill grain elevator in Fairmont, Martin County, Minnesota. The two sites together will be referred to as the Source in regards to this document. The Source proposes to control the fugitive dust generated from the following truck hauling processes: Grain Receiving Haul Trucks to Cargill Grain Shipping Haul Trucks from Cargill DDGS Shipping Haul Trucks from BLE Denaturant Receiving Haul Trucks to BLE Ethanol Shipping Haul Trucks from BLE Proposed Dust Control Measures The Source proposes the following dust control measures to mitigate emissions from the truck hauling activities at the site: Haul roads at the site will be paved; Haul roads at the site near the grain receiving building, the DDGS loadout building, and the ethanol loadout area as well as the north entrance to the facility will be swept and vacuumed daily as illustrated in Appendix V of the Air Permit; Visual inspections of the haul roads will be performed daily; and Haul roads at the site will be swept and vacuumed weekly or when silt has accumulated to visible levels on the road. Signage will be posted to limit the truck traffic speed to 10 miles/hour. Testing The Source proposes to conduct a vacuum pump test of the silt loading semiannually. The tests will occur in July and January in order to collect data during both normal baseline conditions and winter baseline conditions, respectively. The MPCA will be notified of the testing procedure under a submitted testing protocol. The results of the test will be kept on file and provided to the MPCA upon request.

22 Appendix III Modeling Inputs MPCA Dispersion Modeler: Lance Breitenbach Date: July 2008 Other dates of importance: Site visit August 2008 Project Facility: Buffalo Lake Energy, LLC Fairmont, MN, Cargill AgHorizons, Fairmont Modeling was submitted by Natural Resource Group on behalf of Buffalo Lake Energy, LLC and Cargill AgHorizons. This location is considered one source with two permits. I recommend that the air dispersion modeling for the Buffalo Lake Energy and Cargill facility be accepted; the modeling represents an accurate depiction of the facility. Modeling Comments 280 Trucks per day summer, 250 in winter. There is no fence completely surrounding the facility to prohibit the public from getting on site. Indicate what measures are being taken to restrict public access from the site. Railroad tracks are not considered a physical barrier. Modeling was done for hours of operation of BLE was unable to achieve 1 SIL of future growth so any future changes will need to be modeled. Modeling Parameters used Alternate 1 PM10 24hr: *** POINT Source DATA *** Number Emission Rate BASE STACK STACK STACK STACK BLDG SOURCE PART. (g/s) X Y ELEV. HEIGHT TEMP. EXIT Vel. DIAMETER EXISTS ID CATS. (Meters) (Meters) (Meters) (Meters) (DEG.K) (M/SEC) (Meters) CHSSV E YES CHSSV E YES CHSSV E YES CHSSV E YES CHSSV E YES CHSSV E YES CHSSV E YES CHSSV E YES CHSSV E YES CHSSV E YES CHSSV E YES CHSSV E YES CHSSV E YES CHSSV E YES CHSSV E YES CHSSV E YES CHSSV E YES CHSSV E YES

23 CHSSV E YES CHSSV E YES LFJSV E NO LFJSV E NO LFJSV E NO LFJSV E NO LFJSV E NO LFJSV E NO VSWSV E YES VSWSV E YES VSWSV E YES VSWSV E YES VSWSV E YES VSWSV E YES VSWSV E YES VSWSV E YES VSWSV E YES VSWSV E YES EP E YES EP E YES EP E YES EP E YES *** POINT Source DATA *** NUMBER EMISSION RATE BASE STACK STACK STACK STACK BLDG SOURCE PART. (GRAMS/SEC) X Y ELEV. HEIGHT TEMP. EXIT Vel. DIAMETER EXISTS ID CATS. (METERS) (METERS) (METERS) (METERS) (DEG.K) (M/SEC) (METERS) EP E YES EP E YES EP E YES EP E YES FIREPUMP E YES EP102PA E YES SV E YES SV E YES EP E YES *** VOLUME Source DATA *** NUMBER EMISSION RATE BASE RELEASE INIT. INIT. URBAN Emissio SOURCE PART. (GRAMS/SEC) X Y ELEV. HEIGHT SY SZ SOURCE Scalar V ID CATS. (Meters) (Meters) (Meters) (Meters) (Meters) (Meters) BY FS E NO FS E NO FS E NO FS105/2A E NO FS105/2B E NO EP101PA E NO FS101PA E NO F105/2AP E NO F105/2BP E NO CONVPA E NO STORPA E NO

24 STOR2PA E NO FS104PA E NO CONV2PA E NO CONV3PA E NO Modeling Parameters used Alternate 2 PM10 24hr: Appendix IV: Truck Traffic Fence Diagram

25

26 Appendix V: Daily Sweeping and Vacuuming Road Segments

27

28 TECHNICAL SUPPORT DOCUMENT For AIR EMISSION PERMIT NO This technical support document (TSD) is intended for all parties interested in permit and to meet the requirements that have been set forth by the federal and state regulations (40 CFR 70.7(a)(5) and Minn. R , subp. 1). The purpose of this document is to provide the legal and factual justification for each applicable requirement or policy decision considered in the determination to issue the draft/proposed permit. 1. General Information 1.1 Applicant and Stationary Source Location: Table 1. Applicant and Source Address Applicant/Address Cargill Incorporated McGinty road West Mailstop No.1 Wayzata MN, Contact: Dennis Klein Phone: Stationary Source/Address (SIC Code: 5153 / 2869) Buffalo Lake Energy LLC 1125 Bixby Rd Fairmont Martin County 1.2 Facility Description Cargill AgHorizons (Cargill) supports Biofuel Solutions Buffalo Lake Energy (BLE) facility in providing grain required to operate an adjacent fuel-grade ethanol production plant in Fairmont, Minnesota. BLE is proposing a design capacity of 110 million gallons of undenatured ethanol with a maximum design capacity of 118 million gallons of undenatured ethanol or million gallons of denatured ethanol on an annual basis. The Cargill site will increase its throughput of corn in order to supply the ethanol plant. Cargill will receive and store the necessary 43.7 million bushels of grain per year for the ethanol facility in existing grain silos. An enclosed conveying system will transport the grain from the silos to the ethanol facility for processing. The Cargill grain elevator and the new ethanol facility will jointly have controlled emissions less than 95 tons per year for each criteria pollutant. Therefore, the elevator and the ethanol facility will be a synthetic minor source with respect to both Title V permitting and New Source Review. Technical Support Document, Permit Action Number: Page 1 of 4 Date: 11/19/2009

29 1.3 Description of the Activities Allowed by this Permit Action This permit action defines Buffalo Lake Energy LLC as the principal operator of the Cargill AgHorizons facility Facility Emissions: Table 2. Total Facility Potential to Emit Summary Pollutant PM PM 10 SO 2 NO x VOC CO Single All HAPs HAP Ethanol Facility PTE acetaldehyde Cargill Grain Handling Facility Total Classification PSD Part 70 Permit Program Part 63 NESHAP Table 3. Facility Classification Major/Affected Source Synthetic Minor X X Minor X 2. Regulatory and/or Statutory Basis New Source Review The Cargill AgHorizons facility and the Buffalo Lake Energy facility, being treated as one source, have accepted limits on emissions so the source-wide potential-to-emit is less than the major source threshold for federal New Source Review. Cargill AgHorizons and Buffalo Lake Energy remain below the major source threshold with this amendment. Part 70 Permit Program The Cargill AgHorizons facility and the Buffalo Lake Energy facility, being treated as one source, have accepted limits on emissions so the source-wide potential-to-emit is less than the major source threshold for federal Part 70 permit regulation. Cargill AgHorizons and Buffalo Lake Energy remain below the major source threshold with this amendment. New Source Performance Standards (NSPS) This amendment does not cause any additional NSPS s to apply to this facility Technical Support Document, Permit Action Number: Page 2 of 4 Date: 11/19/2009