Permit #: 28.0801-07

Effective Date: March 6, 2015

Expiration Date: March 6, 2020



# SOUTH DAKOTA DEPARTMENT OF

ENVIRONMENT AND NATURAL RESOURCES

TITLE V AIR QUALITY OPERATING PERMIT

Steven M. Pirner, P.E., Secretary Department of Environment and Natural ResourcesUnder the South Dakota Air Pollution Control Regulations

Pursuant to Chapter 34A-1-21 of the South Dakot a Codified Laws and th e Air Pollution Control Regulations of the State of South Dakota and in reliance on statements made by the owner designated below, a permit to operate is hereby issued by the Secretary of the Department of Environment and Natural Resources. This permit au thorizes such owner to operate the unit(s) at the location designated below and under the listed conditions:

A. Owner

1. Company Name and Address

NorthWestern Energy – Yankton

600 Market Street W Huron, SD 57350

2. Actual Source Location and Mailing Address if Different from Above

5/8 mile NE adjacent to Highway 50 Yankton, SD 57078

3. Permit Contact

Cory Huber, Project Manager (605) 352-8411

4. Facility Contact

Cory Huber, Project Manager (605) 352-8411

5. Responsible Official

Dennis Wagner or Cory Huber (605) 352-8411

B. Permit Revisions or Modifications

Not Applicable

C. Type of Operation

Electrical Peaking Plant

### TABLE OF CONTENTS

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### 1.0 Standard Condi tions ...................................................................................... 1

1.1 Operation of source............................................................................................................ ............ 1

1.2 Duty to comply ................................................................................................................ ............... 1

1.3 Property rights or exclusive privileges ....................................................................................... .. 2

1.4 Penalty for violating a permit condition ...................................................................................... 2

1.5 Inspection and entry .......................................................................................................... ............ 2

1.6 Severability .................................................................................................................. ................... 2

1.7 Permit termination, modifi cation, or revocation ........................................................................ 2

1.8 Credible evidence ............................................................................................................. .............. 2



### 2.0 Permit Fe es ..................................................................................................... 3

2.1 Annual air f ee required ....................................................................................................... .......... 3

2.2 Annual operational report ..................................................................................................... ....... 3

2.3 Annual air fee ................................................................................................................ ................. 3



### 3.0 Permit Amendments a nd Modifica tions ...................................................... 3

3.1 Permit flexibility ............................................................................................................ ................ 3

3.2 Administrative permit amendment .............................................................................................. 4

3.3 Minor permit amendment ........................................................................................................ ..... 4

3.4 Permit modification ........................................................................................................... ............ 5

3.5 Permit revision ............................................................................................................... ................ 5

3.6 Testing new fuels or raw materials ............................................................................................ ... 5



### 4.0 Permit Renewal .............................................................................................. 6

4.1 Permit effective .............................................................................................................. ................ 6

4.2 Permit renewal ................................................................................................................ ............... 6

4.3 Permit expiration ............................................................................................................. .............. 6



### 5.0 Recordkeeping an d Reporting ...................................................................... 6

5.1 Recordkeeping and reporting ................................................................................................... .... 6

5.2 Signatory requirements ........................................................................................................ ......... 7

5.3 Certification statement ....................................................................................................... ........... 7

5.4 Monitoring log ................................................................................................................ ................ 7

5.5 Annual records ................................................................................................................ ............... 8

5.6 Annual compliance certification ............................................................................................... .... 8

5.7 Reporting permit violations ................................................................................................... ....... 9

5.8 Quarterly Reporting ........................................................................................................... ........... 9



### 6.0 Control of Regulate d Air Pollutants ............................................................ 9

6.1 Visibility limit .............................................................................................................. ................... 9

6.2 Visibility exceedances ........................................................................................................ .......... 10

### TABLE OF CONTENTS

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6.3 Total suspended particul ate matter limits ................................................................................. 10

6.4 Sulfur dioxide limits ......................................................................................................... ............ 10

6.5 Air emission exceedances – emergency conditions .................................................................... 10

6.6 Circumvention not allowed ..................................................................................................... .... 11

6.7 Minimizing emissions........................................................................................................... ........ 11



### 7.0 PSD AIR QUALITY PERM IT EXEMPT ION ......................................... 11

7.1 Exemption from a PSD air quality permit ................................................................................. 11

7.2 Emission Limits for Unit #4 ................................................................................................... ..... 11

7.3 Hourly limit fo r Unit #4 ...................................................................................................... ......... 12

7.4 Distillate oil sulfur content limit ........................................................................................... ...... 12

7.5 Short term nitrogen oxide limit for Unit #4 ............................................................................... 12



### 8.0 Performance Tests ....................................................................................... 12

8.1 Performance test may be required ............................................................................................. 12

8.2 Test methods and procedures ................................................................................................... .. 12

8.3 Representative p erformance test ............................................................................................... . 12

8.4 Submittal of test plan ........................................................................................................ ........... 13

8.5 Notification of test .......................................................................................................... .............. 13

8.6 Performance test report ....................................................................................................... ....... 13



### 9.0 Monitori ng .................................................................................................... 13

9.1 Periodic opacity monitoring for units operati ng on a monthly or more frequent basis ........ 13

9.2 Monitoring opacity limits for units operating periodically ...................................................... 15

9.3 Certified personnel – visi ble emission tests ................................................................................ 1 6

9.4 Monitoring sulfur content of distillate oil .................................................................................. 16



### 10.0 MACT Requirements – None mergency Engine ....................................... 16

10.1 Date to comply with nonemergency emission limits ................................................................. 16

10.2 Emission limit for nonemergency engine ................................................................................... 16

10.3 Operating limits for none mergency engines .............................................................................. 17

10.4 Fuel requirements for none mergency engines ........................................................................... 17

10.5 General requirements for no nemergency engines .................................................................... 17

10.6 Initial compliance demonstration for nonemergency engines ................................................. 17

10.7 Initial performance test for nonemergency engines may not be required .............................. 19

10.8 Subsequent performance test schedule for nonemergency engines ......................................... 20

10.9 Performance test procedures fo r nonemergency engines ......................................................... 20

10.10 Requirements for a continuous emission monitoring system ................................................ 23

10.11 Requirements for a continuous pa rameter monitoring system ............................................. 24

10.12 Installation of open or closed crankcase system ..................................................................... 26

10.13 Minimizing engine time during startup .................................................................................. 27

10.14 Monitoring and collecting data ................................................................................................ 27

### TABLE OF CONTENTS

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10.15 Demonstrating continuous compliance ................................................................................... 27

10.16 Reporting deviations .......................................................................................................... ....... 28

10.17 Performance test notifications ........................................................................................ ......... 28

10.18 Notification of compliance status ............................................................................................. 29

10.19 Annual complia nce rep ort ...................................................................................................... .. 29

10.20 Recordkeeping for none mergency engines ............................................................................. 31

10.21 Circumvention not allowed ..................................................................................................... . 321 

### 1.0 Standard Conditions

1.1 Operation of source

In accordance with Administrative Rules of Sout h Dakota (ARSD) 74:36:05:16.01(8), the owner or operator shall operate the units, c ontrols, and processes as describe d in Table 1-1 in accordance with the statements, representations, and suppor ting data contained in the complete permit application received July 8, 2014, unless modified by the conditions of this permit. Except as otherwise provided herein, the control equipment shall be operated at all times in accordance with the manufacturer’s specification and in a manner th at achieves compliance with the conditions of this permit. The application c onsists of the application forms, supporting data, and supplementary correspondence. If the owner or operator becomes aw are it failed to submit a ny relevant facts in a permit application or submitted incorrect informati on in an application, such information shall be promptly submitted.

Table 1-1 – Description of Permitted Units, Operations, and Processes

Maximum Control

Unit Description Operating Rate Device

#1 Fairbanks – Morse diesel engine – generator, model #38TDD8-1/8, fired with natural gas and distillate oil. 2,200 kilowatts or 21 MMBtus per hour heat input Oxidation Catalyst

#2 Fairbanks – Morse diesel engine – generator, model #38TDD8-1/8, fired

with distillate oil. 3,000 kilowatts or 28.9 MMBtus per

hour heat input Oxidation Catalyst

#3 Fairbanks – Morse diesel engine – generator, model #PC-2, 18 cyl, fired with natural gas and distillate oil. 6,800 kilowatts or 66.7 MMBtus per

hour heat input Oxidation Catalyst

#4 Fairbanks – Morse diesel engine – generator, model #38TD8 V8-1/8, fired

with distillate oil. 2,200 kilowatts or 21.2 MMBtus per

hour heat input Oxidation Catalyst

#5 Tank #1 – vertical aboveground storage

tank. 200,000 gallons None applicable

#6 Tank #2 – vertical aboveground storage

tank. 200,000 gallons None applicable

1.2 Duty to comply In accordance with ARSD 74:36:05:16.01(12), the ow ner or operator shall comply with the conditions of this permit. An owner or opera tor who knowingly makes a false statement in any record or report or who falsifie s, tampers with, or renders inaccu rate, any monitoring device or method is in violation of this permit. A violat ion of any condition in this permit is grounds for enforcement, reopening this permit, permit termination, or denial of a permit renewal application. The owner or opera tor, in an enforcement action, cannot use the defense that it would have been necessary to cease or reduce the permitted activity to maintain compliance. The owner or operator shall provide any inform ation requested by the S ecretary to determine compliance or whether cause exists for re opening or terminating this permit.2 1.3 Property rights or exclusive privileges In accordance with ARSD 74:36:05:16.01(12), the Stat e’s issuance of this permit, adoption of design criteria, and approval of plans and specifications does not convey any property rights of any sort, any exclusive privileg es, any authorization to damage , injure or use any private property, any authority to invade personal rights, any authority to violate federal, state or local laws or regulations, or any taking, condemnation or use of eminent domain against any property owned by third parties. The State does not wa rrant the owner’s or operator’s compliance with this permit, design criteria, a pproved plans and specifications, and operation under this permit, will not cause damage, injury or use of privat e property, an invasion of personal rights, or violation of federal, state or local laws or re gulations. The owner or operator is solely and severally liable for all da mage, injury or use of private pr operty, invasion of personal rights, infringement of federal, state or local laws and regulations, or taking or condemnation of property owned by third parties, which may result from actions taken under the permit.

1.4 Penalty for violating a permit condition

In accordance with South Dakota Codified Laws (SDCL) 34A-1-39 and 34A -1-47, a violation of a permit condition may subject the owner or operato r to civil or criminal prosecution, a state penalty of not more than $10,000 per day per vi olation, injunctive action, administrative permit action, and other remedies as provided by law.

1.5 Inspection and entry In accordance with SDCL 34A-1-41, the owner or operator shall allow the Secretary, upon presentation of credentials, to:

1. Enter the premises where a regulated activity is located or where pertinent records are stored;

2. Have access to and copy any records required under this permit;

3. Inspect operations regulated under this permit; and/or

4. Sample or monitor any substances or parame ters for the purpose of assuring compliance.

1.6 Severability In accordance with ARSD 74:36:05:16.01(11), any portion of this permit that is void or challenged shall not affect the validity of the remaining permit requirements.

1.7 Permit termination, mo dification, or revocation In accordance with ARSD 74:36:05:46, the Secret ary may recommend the Board of Minerals and Environment terminate, modif y, or revoke this permit for viol ations of SDCL 34A-1 or the federal Clean Air Act or for nonpayment of a ny outstanding fee or enforcement penalty.

1.8 Credible evidence In accordance with ARSD 74:36:13:07, credible evidence may be used for the purpose of establishing whether the owner or op erator has violated or is in vi olation of this permit. Credible evidence may consist of the following:3 1. Information from the use of the following met hods is presumptively credible evidence of

whether a violation has occurred:

a. A monitoring method approved pursuant to 40 CFR § 70.6(a)(3) and incorporated in this permit; or

b. Compliance methods specified in an applicable plan;

2. The following testing, monitoring, or informa tion gathering methods are presumptively credible testing, monitoring, or information-gathering methods:

a. Any monitoring or testing me thods approved in this permit, including those in 40 CFR Parts 51, 60, 61, and 75; or

b. Other testing, monitoring, or information-gathering met hods that produce information comparable to that produced by any me thod in paragraph (1) or (2)(a).



### 2.0 Permit Fees

2.1 Annual air fee required In accordance with ARSD 74:36:05:06.01, the owne r or operator shall submit an annual

administrative fee and an annual fee. The fee is based on actual emissions in accordance with

ARSD 74:37.

2.2 Annual operational report In accordance with ARSD 74:37:01:06, the Secretar y will supply the owner or operator with an annual operational report in January of each year . The owner or operator shall complete and submit the operational report to the Secretary by Ma rch 1 of each year. The responsible official shall sign the operational report in the presence of a notary public.

2.3 Annual air fee In accordance with ARSD 74:37:01:08, the Secretar y will notify the owner or operator of the required annual air emission fee and administrativ e fee by June 1 of each year. The fees shall accrue on July 1 and are payable to the Depart ment of Revenue by July 31 of each year.



### 3.0 Permit Amendments and Modifications

3.1 Permit flexibility In accordance with ARSD 74:36:05:30, the owner or operator shall have the flexibility to make changes to the source during the te rm of this permit. The owne r or operator shall provide the Secretary written notice at least seven days in advance of the proposed change (NOTE: The Secretary will forward a copy of the written notice to EPA). Th e written notice shall include a brief description of the change, the date on wh ich the change is to occur, any change in emissions, the proposed changes to the permit, a nd whether the requested revisions are for an administrative permit amendment, minor perm it amendment, or permit modification.4 The Secretary will notify the owner or operator wh ether the change is an administrative permit amendment, a minor permit amendment, or a perm it modification. A proposed change that is considered an administrative pe rmit amendment or a minor permit amendment can be completed immediately after the Secretary receives the written notification. The owner or operator must comply with both the applicable requirements governing the change and the proposed permit terms and conditions until the Secretary ta kes final action on the proposed change.

A proposed change that is considered a modifi cation cannot be implemented until the Secretary takes final action on the proposed change or the owner or operator was issued an air quality construction permit. Permit modifications are su bject to the same procedural requirements, including public comment, as th e original permit issuance except that the required review shall cover only the proposed changes.

3.2 Administrative permit amendment In accordance with ARSD 74:36:05:33, the Secretary has 60 days from receipt of a written notice to verify the proposed change is an administrative permit ame ndment. As provided in ARSD 74:36:01:03, the Secretary consid ers a proposed change an admi nistrative permit amendment if the proposed change accomplishes one of the following:

1. Corrects typographical errors;

2. Changes the name, address, or phone number of any person identified in this permit or provides a similar minor administrative change;

3. Requires more frequent monitoring or reporting;

4. The ownership or operational control change s and the Secretary determines no other change in this permit is necessary. However, the new owner must s ubmit a certification of applicant form and a written statement sp ecifying the date for transfer of operating permit responsibility, cove rage, and liability; or

5. Any other changes the Secretary and the administrator of EPA determines to be similar to those requirements in this condition.

3.3 Minor permit amendment In accordance with ARSD 74:36:05:38, the Secretary has 90 days from receipt of a written notice or 15 days after the end of EPA's 45-day review period, whichever is later, to take final action on a minor permit amendment. Final action cons ists of issuing or denying a minor permit amendment or determining the proposed change is a permit modification. As provided in ARSD 74:36:05:35, the Secretary consider s a proposed change to be a minor permit amendment if the proposed change:

1. Does not violate any applicable requirements;

2. Does not involve significant changes to existing monitori ng, reporting, or recordkeeping requirements;

3. Does not require or change a case-by-case de termination of an emission limit or other standard, a source-specific determination for te mporary sources of ambient impacts, or a visibility or increment analysis; or5 4. Does not seek to establish or change a perm it term or condition for which the source has assumed to avoid an applicable requirement, a federally enforceable emission cap, or an alternative emission limit. An alternative emission limit is approved pursuant to regulations promulgated under section 112( i)(5) of the federal Clean Air Act.

3.4 Permit modification In accordance with ARSD 74:36:05:39, an owner or operator may apply for a permit modification. A permit modificati on is defined in ARSD 74:36:01: 10 as a physical change in or change in the operation of a source that results in at least one of the following:

1. An increase in the amount of an air polluta nt emitted by the sour ce or results in the emission of an air pollutant not previously emitted;

2. A significant change to existing monitoring, reporting, or recordkeeping requirements in the permit;

3. The change requires or change s a case-by-case determina tion of an emission limit or other standard, a source-specific determinati on for temporary sources of ambient impacts, or a visibility or increment analysis; or

4. The change seeks to establish or change a permit term or condition for which there is a corresponding underlying applicable requirement that the source has assumed to avoid an applicable requirement, a federally enfo rceable emissions cap assumed to avoid classification as a modification under a provision of the Title I of the Clean Air Act, or an alternative emissions limit approved pursuant to regulations promulgated under section 112(i)(5) of the Clean Air Act.

Permit modifications are subject to the same procedural requirements, including public comment, as the original permit issuance excep t the required review shall cover only the proposed changes.

3.5 Permit revision In accordance with ARSD 74:36:05:40, the Secretary may reopen and revise this permit to meet requirements of SDCL 34A-1 or the federal Clean Air Act. In accordance with ARSD 74:36:05:41, the Secretary shall no tify the owner or operator at least 30 days before reopening this permit. The 30-day period may be less in the case of an emergency.

3.6 Testing new fuels or raw materials In accordance with ARSD 74:36:11:04, an owner or operator may request permission to test a new fuel or raw material to determine if it is compatible with existing equipment before requesting a permit amendment or modification. A complete test proposal shall consist of the following:

1. A written proposal describing the new fuel or raw material, operating parameters, and parameters that will be monitored and any te sting associated with air pollutant emissions during the test;

2. An estimate of the type and amount of regul ated air pollutant emissions resulting from the proposed change; and6 3. The proposed schedule for conducting the test. In most cases the ow ner or operator will

be allowed to test for a maximum of one wee k. A request for a test period longer than one

week will need additional justification. A test peri od shall not exceed 180 days.

The Secretary shall approve, conditionally approve, or deny in writing the test proposal within 45 days after receiving a complete proposal. Approval conditions may include changing the test schedule or pollutant sampling a nd analysis methods. Pollutant sampling and analysis methods may include, but are not limited to performan ce testing, visible emission evaluation, fuel analysis, dispersion modeling, and monitori ng of raw material or fuel rates.

If the Secretary determines the proposed change will result in an increase in the emission of a regulated air pollutant or result in the emission of an addition al regulated air pollutant, the Secretary shall give public notice of the proposed test for 30 days. The Secretary shall consider all comments received during the 30-day public comment period before making a final decision

on the test.

The Secretary will not approve a test if the test would cause or contribute to a violation of a national ambient air quality standard.



### 4.0 Permit Renewal

4.1 Permit effective In accordance with ARSD 74:36:05:07, this permit sha ll expire five years from date of issuance unless reopened or terminated for cause.

4.2 Permit renewal In accordance with ARSD 74:36:05:08, the owner or operator shall submit an application for a permit renewal at least 180 days before the date of permit expiration if the owner or operator wishes to continue to operate an activity regulated by this pe rmit. The current permit shall not expire and shall remain in effect until the Secretary takes final ac tion on the timely permit renewal application.

4.3 Permit expiration In accordance with ARSD 74:36:05:28, permit expira tion terminates the owner’s or operator’s right to operate any unit covered by this permit.



### 5.0 Recordkeeping and Reporting

5.1 Recordkeeping and reporting In accordance with ARSD 74:36:05:16.01(9), the owner or operator shall maintain all monitoring data, records, reports, and pertinent information specified by this permit for five years from the date of sample, measurement, report, or applica tion unless otherwise specif ied in this permit.

The records shall be maintained on site for the fi rst two years and may be maintained off site for7 the last three years. All record s must be made available to th e Secretary for inspection. All notifications and reports shall be submitted to the following address:

South Dakota Department of Envi ronment and Natural Resources PMB 2020, Air Quality Program 523 E. Capitol, Joe Foss Building Pierre, SD 57501-3182

5.2 Signatory requirements

In accordance with ARSD 74:36:05:12 and 74:36: 05:16.01, all applications, reports, or other information submitted to the Secretary shall be si gned and certified by a responsible official or a duly authorized representative. A responsible offi cial for a corporation is a responsible corporate officer and for a partnership or sole proprieto rship is a general partner or the proprietor, respectively. A person is a duly au thorized representative only if:

1. The authorization is made in writing by a person describe d above and submitted to the Secretary; and

2. The authorization specifies either an indivi dual or a position having responsibility for the overall operation of the regulated facility, such as the position of plant manager, superintendent, position of e quivalent responsibility, or an individual or position having overall responsibility for environmental matters.

The duly authorized representative must be designa ted prior to or together with any reports or information to be signed by a duly authorized repr esentative. The responsible official shall notify the Secretary if an authoriza tion is no longer accurate.

5.3 Certification statement In accordance with ARSD 74:36:05:16.01(14)(a), all documents required by this permit, including application forms, reports, and co mpliance certification, mu st be certified by a responsible official or a duly authorized representative. Th e certification shall include the following statement:

“I certify that, based on in formation and belief formed after reasonable inquiry, the

statements and information in this docume nt and all attachments are true, accurate, and complete.”

5.4 Monitoring log In accordance with ARSD 74:36:05:16.01(9), the owne r or operator shall maintain a monitoring log. The monitoring log shall cont ain the following information.

1. Maintenance schedule for each piece of cont rol equipment listed in Table 1-1. At a minimum, the maintenance schedule sh all meet the manufacturer’s recommended schedule for maintenance. The following inform ation shall be recorded for maintenance:

a. Identify the unit;

b. The date and time maintenance was performed;8 c. Description of the type of maintenance;

d. Reason for performing maintenance; and

e. Signature of person performing maintenance;

2. The following information shall be recorded fo r each visible emission reading required in permit condition 8.1 and 8.2:

a. Identify the unit and if it operates on a monthly, quarterly, semiannual, or annual basis;

b. The date and time the visible em ission reading was performed;

c. If visible emissions were observed;

d. Description of maintenance performe d to eliminate visible emissions;

e. Visible emission evaluation if visible emissions are not eliminated; and

f. Signature of person performing visible em ission reading and/or visible emission evaluation; and

3. The following information shall be recorded within two days of each emergency

exceedance:

a. The date of the emergency exceedance and the date the emergency exceedance was reported to the Secretary;

b. The cause(s) of the emergency;

c. The reasonable steps taken to minimize th e emissions during the emergency; and

d. A statement the permitted equipment was at the time being properly operated.

5.5 Annual records In accordance with ARSD 74:36:05:16.01(9), the owne r or operator shall calculate and record the following amounts from January 1 to December 31 of each year:

1. The amount of hours Unit #1, #2, #3 and #4 operated;

2. The amount of natural gas consumed in Units #1 and #3, in million cubic feet;

3. The amount distillate oil consumed in Units #1, #2, #3 and #4, in gallons;

4. The sulfur content of the fuel consumed in Units #1, #2, #3 and #4; and

5. The amount of nitrogen oxide, sulfur dioxi de and carbon monoxide emitted from Unit #4,

in tons.

The amount of natural gas and distillate oil consumed and throughput shall be based on production records, consumption re cords, purchase records, etc.

5.6 Annual compliance certification In accordance with ARSD 74:36:05:16.01(14), the owner or operator shall submit an annual compliance certification letter to the Secretary by March 1 of each year this permit is in effect (NOTE: The Secretary will forward a copy of the certification letter to EPA). The certification shall contain the following information:

1. Methods used to determine compliance, including: monitoring, recordkeeping, performance testing and reporting requirements;

2. The source is in compliance and will conti nue to demonstrate compliance with all applicable requirements;9 3. In the event the source is in noncompliance, a compliance plan that indicates how the source has or will be brought into compliance; and

4. Certification statement required in permit condition 5.3.

5.7 Reporting permit violations In accordance with ARSD 74:36:05:16.01(9), the ow ner or operator shall report all permit violations. A permit violation s hould be reported as soon as possibl e, but no later than the first business day following the day the violation was discovered. The permit violation may be reported by telephone to the South Dakota Department of Environm ent and Natural Resources at (605) 773-3151 or by F AX at (605) 773-4068.

A written report shall be submitted within five days of discovering the permit violation. Upon prior approval from the Secretary, the submittal deadline for the written report may be extended up to 30 days. The written report shall contain:

1. A description of the permit violation and its cause(s);

2. The duration of the permit violation, including exact dates and times; and

3. The steps taken or planned to reduce, elimin ate, and prevent reoccurrence of the permit

violation.

5.8 Quarterly Reporting In accordance with ARSD 74:36:05:16.01(9), the owner or operator shall submit a semi-annual report to the Secretary by the end of each quart er period. The quarterly report shall contain the following information:

1. Name of facility, permit number, referen ce to this permit, condition, identifying the submittal as a quarterly report, and calenda r dates covered in the reporting period;

2. The number of hours Unit #4 operated duri ng each month, and during the 12-month rolling period for that month; and

3. The sulfur content of di stillate oil consumed.

The frst semi-annual report must be postmarke d no later than 30 days after the end of the calendar half in which the permit was issued. Th e remaining reports must be postmarked no later than 30 days after th e end of the reporti ng period (i.e., July 30 th and January 30 th ).



### 6.0 Control of Regulated Air Pollutants

6.1 Visibility limit In accordance with ARSD 74:36:12:01, the owner or operator may not discharge into the

ambient air an air contaminant of a density equal to or greater th an that designated as 20 percent opacity from any permitted unit, operation, or process listed in Table 1-1, unless otherwise specified in this permit. This provision does not apply when the presence of uncombined water is the only reason for failure to meet the requirement.10 6.2 Visibility exceedances In accordance with ARSD 74:36:12:02, an exceeda nce of the opacity limit in permit condition 6.1 is not considered a violation during brief pe riods of soot blowing, start-up, shutdown, or malfunctions. Malfunction means any sudden and una voidable failure of ai r pollution control equipment, process equipment, or a process to op erate in a normal or usual manner. A failure caused entirely or in part by poor maintenan ce, careless operation, preventable equipment breakdown, or any other cause with in the control of the owner or operator is not a malfunction

and is considered a violation.

6.3 Total suspended part iculate matter limits In accordance with ARSD 74:36:06:02(1), the owner or operator shall not allow the emission of total suspended particulate matter in excess of th e emission limit specified in Table 6-1 for the appropriate permitted unit, operation, and process.

Table 6-1 – Total Suspended Par ticulate Matter Emission Limit

Unit Description Emission Limit

#1 Fairbanks – Morse diesel engine. 0.5 pounds per million Btu heat input

#2 Fairbanks – Morse diesel engine. 0.5 pounds per million Btu heat input

#3 Fairbanks – Morse diesel engine. 0.5 pounds per million Btu heat input

#4 Fairbanks – Morse diesel engine. 0.5 pounds per million Btu heat input

6.4 Sulfur dioxide limits In accordance with ARSD 74:36:06:02(2), the owner or operator shall not allow the emission of sulfur dioxide in excess of the emission limit specified in Table 6-2 for the appropriate permitted unit, operations, and process.

Table 6-2 – Sulfur Dioxide Emission Limit

Unit Description Emission Limit

#4 Fairbanks – Morse diesel engine. 3.0 pounds per million Btu heat input

Compliance with the sulfur dioxide emission limit is based on a three-hour rolling average, which is the arithmetic average of three contiguous one-hour periods.

6.5 Air emission exceedances – emergency conditions In accordance with ARSD 74:36:05:16.01(18), the Secretary will allow for an unavoidable emission exceedance of a technology-based emissi on limit if the exceedance is caused by an emergency condition and immediate action is ta ken by the owner or operator to restore the operations back to normal. An emergency condi tion is a situation arising from a sudden and reasonably unforeseeable event beyond the control of the owner or operator, including acts of God. An emergency shall not include an emission exceedance to the extent caused by improperly designed equipment, lack of preventi ve maintenance, careless or improper operation, or operator error. The owner or operator shall notify the Secretary within two working days of the incident and take all steps possible to elim inate the excess emissions. The notification must provide a description of the emergency, any step s taken to mitigate emissions, and corrective11 actions taken. If the notification is subm itted orally, a written report summarizing the information required by the notification shall be submitted and postmarked within 30 days of the

oral notification

6.6 Circumvention not allowed In accordance with ARSD 74:36:08:03, as referen ced to 40 CFR § 63.4(b), no owner or operator shall build, erect, install, or use any article, machine, equipment, or process to conceal an

emission that would otherwise constitute nonc ompliance with a relevant standard. Such concealment includes, but is not limited to the use of diluents to achieve compliance with a

relevant standard based on the concentration of a pollutant in the efflue nt discharged to the atmosphere.

6.7 Minimizing emissions In accordance with ARSD 74:36:08:03, as referen ced to 40 CFR § 63.6(e)(1)(i), the owner or operator shall at all times, in cluding periods of startup, shut down, and malfunction, operate and maintain any permitted unit, including associated air pollution control equipment and monitoring equipment, in a manner consistent with safe ty and good air pollution control practices for minimizing emissions. During a period of startup, shutdown, or malfunction, th is general duty to minimize emissions requires the owner or operator to reduce emissions from the permitted unit to the greatest extent which is consistent with safety and good air pollution control practices. The general duty to minimize emissions during a peri od of startup, shutdown, or malfunction does not require the owner or operator to achieve emission le vels that would be requ ired by the applicable

standard at other times if this is not consistent with safety a nd good air pollution control practices, nor does it require the owner or ope rator to make any further efforts to reduce emissions if levels required by the applicable standard have been ac hieved. Determination of whether such operation and maintenance procedures are being used will be based on information available to the Secretary which may include, but is not limited to, monitori ng results, review of operation and maintenance procedures (including a startup, shutdown, and malfunction plan, if required), review of operation and maintenance records, and inspection of the operation.



### 7.0 PSD AIR QUALITY PERMIT EXEMPTION

7.1 Exemption from a PSD ai r quality permit In accordance with ARSD 74:36:04:15(9), the owner or operator is exempt from the prevention of significant deterioration progr am for Unit #4. The exemption is based on operational and air emission limits in this permit condition 1.1, 7.2 a nd 7.3, inclusive. Any relaxation in this permit that increases nitrogen oxide, sulfur dioxide, or car bon monoxide emissions greater than 38 tons per 12-month rolling period for Unit #4 may require a full prevention of significant deterioration review as though construction ha d not commenced on the source.

7.2 Emission Limits for Unit #4 In accordance with ARSD 774:36:05:16.01(8), the owner or operator shall not emit nitrogen oxide, sulfur dioxide, and carbon monoxide in amount s greater than 38 tons per 12-month rolling12 total. The 12-month rolling total shall be calcul ated every month using that month’s value and the previous 11 months’ values.

7.3 Hourly limit for Unit #4 In accordance with ARSD 74:36:05:16.01(8), the owne r or operator shall not operate Unit #4 for more than 1,120 hours each during any 12-month rolling period. The 12-month rolling total shall be calculated every month using that mont h’s value and the previ ous 11 months’ values.

7.4 Distillate oil sulfur content limit In accordance with ARSD 74:36:05:16.01(8), the owner or operator shall burn distillate oil in Unit #4 which contains sulfur in excess of 0.5 percent by weight.

7.5 Short term nitrogen oxide limit for Unit #4

In accordance with ARSD 74:36:05:16.01(8), the owne r or operator shall not emit more than 67.0 pounds per hour of nitrogen oxide from Unit #4.



### 8.0 Performance Tests

8.1 Performance test may be required In accordance with ARSD 74:36:11:02, the Secretar y may request a performance test during the term of this permit. A performance test shall be conducted while operating the unit at or greater than 90 percent of its maximum design capacity, unless otherwise specified by the Secretary. A performance test conducted while operating less than 90 percent of its maximum design capacity will result in the operation being limited to the percent achieved during the performance test. The Secretary has the discretion to extend the deadline for completion of performance test required by the Secretary if circumstances reasonably warrant but will not extend the deadline past a federally required perf ormance test deadline.

8.2 Test methods and procedures In accordance with ARSD 74:36:11:01, the owner or operator shall conduct the performance test in accordance with 40 CFR Part 60, Appendix A, 40 CFR Part 63, Appendix A, and 40 CFR Part 51, Appendix M. The Secretary may approve an alternative method if a performance test specified in 40 CFR Part 60, Appendix A, 40 CFR Part 63, Appendix A, and 40 CFR Part 51, Appendix M is not federally app licable or federally required.

8.3 Representative performance test In accordance with ARSD 74:36:07:01, as referenced to 40 CFR § 60.8(c), performance tests shall be conducted under such conditions as the Secretary shall specify to the owner or operator based on the representative performance of the unit being tested. The owner or operator shall make available to the Secretary such records as may be necessary to determine the conditions of the performance tests. Operations during peri ods of startup, shutdown, and malfunction shall not constitute representative conditions for the purpose of a performance test nor shall emissions in excess of the level of the applicable emission limit during pe riods of startup, shutdown, and malfunction be considered a violation of the applicable emission limit unless otherwise specified in this permit.13 8.4 Submittal of test plan In accordance with ARSD 74:36:11:01, the owner or operator shall submit the proposed testing procedures to the Secretary at least 30 days pr ior to any performance test. The Secretary will notify the owner or operator if the proposed test procedures are approv ed or denied. If the proposed test procedures are denied, the Secr etary will provide written notification outlining what needs to be completed for approval.

8.5 Notification of test In accordance with ARSD 74:36:07:01, as referen ced to 40 CFR § 60.8(d), the owner or operator shall notify the Secretary at least 30 days prior to the start of a performa nce test to afford the Secretary the opportunity to have an observer pr esent. If there is a delay in conducting the scheduled performance test, the owner or operato r shall notify the Secret ary as soon as possible of any delay in the original test date, either by providing at least 7 days prior notice of the rescheduled date of the performance test, or by arranging a rescheduled date with the Secretary by mutual agreement.

8.6 Performance test report In accordance with ARSD 74:36:05:16.01(9), the owner or operator shall submit a performance test report to the Secretary with in 60 days after completing the performance test or by a date designated by the Secretary. The performan ce test report shall contain the following

information:

1. A brief description of the pr ocess and the air pollution co ntrol system being tested;

2. Sampling location description(s);

3. A description of sampling and analytical pro cedures and any modifications to standard procedures;

4. Test results represented in the sa me terminology as the permit limits;

5. Quality assurance procedures and results;

6. Records of operating conditions during the te st necessary for demonstrating compliance with the permit limits, preparation of standards, and calibration procedures;

7. Raw data sheets for field sampling and field and laboratory analyses;

8. Documentation of calculations;

9. All data recorded and used to establish parameters for compliance monitoring; and

10. Any other information re quired by the test method.



### 9.0 Monitoring

9.1 Periodic opacity monitoring for units opera ting on a monthly or more frequent basis In accordance with ARSD 74:36:05:16.01(9), the owner or operator shall demonstrate compliance with the opacity limits in Chapter 6.0 on a periodic basis for the units identified in the monthly log required in permit condition 5.4 that operate on a monthly or more frequent basis. Periodic monitoring for units that operate on a monthly or more fr equent basis shall be based on the following steps:14 Step 1: Periodic monitoring shall consist of a visi ble emission reading. A visible emission reading shall consist of a visual survey of each unit over a two-minute period to identify if

there are visible emissions. The visible emissi on reading must be c onducted while the unit is in operation; but not during periods of start up, shutdown, or malfuncti ons. Visible emission readings shall be based on the following frequency:

a. The owner or operator shall conduct a vi sible emission reading once per calendar month;

b. If no visible emissions are observed from a unit in six consecutive monthly visible emission readings, the owner or operator may decrease the frequency of readings from monthly to semiannually for that unit; or

c. If no visible emissions are observed from a unit in two consecutive semiannual visible emission readings, the owner or operator may decrease the frequency of testing of readings from semia nnually to annually for that unit.

Step 2: If visible emissions are observed from a unit at any time other than periods of startup, shutdown, or malfunction, periodic monitoring sh all consist of a visible emission test to

determine if the unit is in co mpliance with the opacity limit specified in Chapter 6.0. The

visible emission test shall be for at least si x minutes and conducted in accordance with 40 CFR Part 60, Appendix A, Method 9. The visible emission test must be conducted while the unit is in operation; but not during periods of startup, s hutdown, or malfunctions. Visible emission tests shall be based on the following frequency:

a. The visible emission test must be conducted within one hour of witnessing a visible emission from a unit;

b. If the visible emission test requ ired in Step 2(a) results in an opacity value less than or equal to 50 percent of the opacity limit for the unit, the owner or operator shall perform a visible emission test once per month;

c. If the opacity value of a visible emission test in Step 2(b) is less than five percent for three straight monthly tests, the owner or operator may revert back to monthly visible emission readings as required in Step 1;

d. If the visible emission test re quired in Step 2(a) results in an opacity value greater than 50 percent of the opacity limit but le ss than the opacity limit, the owner or operator shall perform a visible emission test once per week; or

e. If the visible emission test in Step 2(d) results in an opacity value less than or equal to 50 percent of the opacity limit for four st raight weekly readings, the owner or operator may revert back to a monthly visibl e emission test as re quired in Step 2(b).

The person conducting the visible em ission reading does not have to be certified in accordance with 40 CFR Part 60, Appendix A, Method 9. Th e person conducting the vi sible emission test

must be certified in accordance with 40 CFR Part 60, Appendix A, Method 9. If a visible emission test is required before a person is certified in accordance with permit condition 9.3, the owner or operator shall notify the Secretary within 24 hour s of observing the visible emissions to schedule a visible emission test performed by a state inspector.15 9.2 Monitoring opacity limits fo r units operating periodically In accordance with ARSD 74:36:05:16.01(9), the owner or operator shall demonstrate compliance with the opacity limits in Chapter 6.0 for the units identified in the monthly log required in permit condition 5.4 that operate on a quarterly, semiannual, or annual basis. Periodic monitoring shall be based on the following steps:

Step 1: For units that operate on a qu arterly basis, monitoring sha ll consist of the following:

a. Monitoring shall consist of a visible emi ssion reading once per quarter. A visible emission reading shall consist of a visual survey of the unit over a two-minute period to identify if there are visible emissions . The visible emission reading must be conducted while the unit is in operation; but not during periods of startup, shutdown, or malfunctions; or

b. If visible emissions are observed from a unit at any time other than periods of startup, shutdown, or malfunc tion, the owner or operator shall conduct a visible emission test on that unit to determine if the unit is in compliance with the opacity limit specified in Chapter 6.0. The visible emission test must be conducted within one hour of witnessing a visible emission fr om the unit. The visible emission test

shall be for at least six minutes and c onducted in accordance with 40 CFR Part 60, Appendix A, Method 9. The visi ble emission test must be conducted while the unit is in operation; but not during periods of startup, shutdown, or malfunctions.

Step 2: For units that operate on a se miannual or annual basis, mon itoring shall consist of the following:

a. Monitoring shall consist of a visible em ission reading once per year. A visible emission reading shall consist of a visual survey of the unit over a two-minute period to identify if there are visible emissions . The visible emission reading must be conducted while the unit is in operation; but not during periods of startup, shutdown, or malfunctions;

b. If visible emissions are observed from a unit at any time other than periods of startup, shutdown, or malfunc tion, the owner or operator shall conduct a visible emission test on that unit to determine if the unit is in compliance with the opacity limit specified in Chapter 6.0. The visible emission test must be conducted within one hour of witnessing a visible emission fr om the unit. The visible emission test

shall be for at least six minutes and c onducted in accordance with 40 CFR Part 60, Appendix A, Method 9. The visi ble emission test must be conducted while the unit is in operation; but not during periods of startup, shutdown, or malfunctions.

The person conducting the visible em ission reading does not have to be certified in accordance with 40 CFR Part 60, Appendix A, Method 9. Th e person conducting the vi sible emission test

must be certified in accordance with 40 CFR Part 60, Appendix A, Method 9. If a visible emission test is required before a person is certified in accordance with permit condition 9.3, the owner or operator shall notify the Secretary within 24 hour s of observing the visible emissions to schedule a visible emission test performed by a state inspector.16 9.3 Certified personnel – visible emission tests In accordance with ARSD 74:36:13:07, within 1 80 days after permit issuance the owner or operator shall retain a person that is certified to perform a visible emissi on test in accordance with 40 CFR Part 60, Appendix A, Method 9. The owner or operator sha ll retain a certified person throughout the remaini ng term of this permit.

9.4 Monitoring sulfur content of distillate oil In accordance with ARSD 74:36:05:16.01(9), the owne r or operator shall obtain a fuel supplier

certification for each load of dis tillate oil (diesel) purchased or received. The fuel supplier certification shall include the following information:

1. The name of the oil supplier;

2. A statement from the oil supplier that the oil complies with the specifications under the definition of distillate oil (diesel). Distillate oil (diesel) means fuel oil that complies with the specifications

for fuel oil numbers 1 or 2. Residua l oil means crude oil and is fuel oil that does not comply with the specifications under the definiti on of distillate oil and includes all fuel oil numbers 4, 5, and 6. Specifications for fuel oils are defined in the Am erican Society for Testing and Materials in ASTM D396-78, "Standards Specificati ons for Fuel Oils"; and

3. A statement that the sulfur content of the oil does not exceed 0.0015 weight percent sulfur.

In the case where a fuel supplier certification is not obtained, th e owner or operato r shall collect a grab sample from the storage tank within 30 da ys of receiving the shipment of distillate oil (diesel) but before another load is transferred into the storag e tank. The grab sample shall be analyzed to determine the sulfur c ontent of the distillate oil (diesel) in the storage tank. A copy of the results of the analysis shall be submitted with the semiannual report required in permit

condition 5.5.



### 10.0 MACT Requirements – Nonemergency Engine

10.1 Date to comply with nonemergency emission limits In accordance with ARSD 74:36:08:40, as referen ced to 40 CFR § 63.6595(a)(1), the owner or operator shall comply with the applicable emission standards and operating limitations specified in this chapter on and after May 3, 2013. This condition applies to Unit #1, #2, #3 and #4.

10.2 Emission limit for nonemergency engine In accordance with ARSD 74:36:08:40, as referenced to 40 CFR §§ 63.6603(a) and 63.6625(h), except during periods of start up, the owner or operator shall limit concentrations of carbon monoxide emission from the nonemergency engine to less than or equal to 23 parts per million by volume on a dry basis at 15 percent oxygen or reduce carbon monoxide emissions from the nonemergency engine by 70 percent or more. Co mpliance with the numerical emission limit is based on the results of testing the average of th ree 1-hour runs using the testing requirements and procedures in permit condition 10.9. This condition applies to Unit #1, #2, #3 and #4.17 10.3 Operating limits for nonemergency engines In accordance with ARSD 74:36:08:40, as referenced to 40 CFR §§ 63.6603(a) and 63.6630(b), the owner or operator shall comp ly with the emission limit in permit condition 10.2 by one of the following methods:

1. If the owner or operator uses a oxidation catalyst, the owner or operator shall:

a. Maintain the catalyst so the pressure drop across the catalys t does not change by more than 2 inches of water from the pressure drop across the catalyst measured during the initial performance test; and

b. Maintain the temperature of the exhaust ga ses so the catalyst inlet temperature is greater than or equal to 450 degrees Fahrenheit and le ss than or equal to 1,350 degrees Fahrenheit.

2. If the owner or operator complies without us ing an oxidation catal yst, the owner or operator shall comply with operating limits approved by the Secretary.

This condition applies to Unit #1, #2, #3 and #4.

10.4 Fuel requirements fo r nonemergency engines In accordance with ARSD 74:36:08:40, as referenced to 40 CFR § 63.6604(a), the owner or operator shall only combust diesel fuel in the nonemergency engine that meets the following per gallon standards:

1. Maximum sulfur content of 15 parts per million; and

2. Minimum cetane index of 40; or

3. Maximum aromatic content of 35 volume percent.

This condition applies to Unit #1, #2 and #4.

10.5 General requirements fo r nonemergency engines In accordance with ARSD 74:36:08:40, as referenced to 40 CFR § 63.6605, the owner or operator shall be in complianc e with permit condition 10.2 and 10.3 at all times. The owner or operator at all times shall operate and maintain the nonemergency engine, including associated air pollution control e quipment and monitoring equipment, in a manner consistent with safety and good air pollution control practices for minimi zing emissions. The general duty to minimize emissions does not require the owne r or operator to make any furt her efforts to reduce emissions if levels required in permit condition 10.2 a nd 10.3 have been achieved. Determination of whether such operation and maintenance procedur es are being used will be based on available information which may include, but is not limited to, monitoring results, review of operation and maintenance procedures, review of operation an d maintenance records, and inspection of the nonemergency engine. This condition applies to Unit #1, #2, #3 and #4.

10.6 Initial compliance demonstrat ion for nonemergency engines In accordance with ARSD 74:36:08:40, as referenced to 40 CFR §§ 63.6612(a) and 63.6630(a), the owner or operator shall condu ct an initial compliance demons tration within 180 days after May 3, 2013, according to one of the following applicable methods:18 1. If the owner or operator redu ces carbon monoxide emissions using an oxidation catalyst and continuous parameter monitoring system, initial compliance is demonstrated by conducting an initial performance test using the applicable procedures described in permit condition 10.9 and if:

a. The average reduction of carbon monoxide emissions determined from the initial performance test achieves the required carbon monoxide percent reduction in permit condition 10.2;

b. The owner or operator inst alled a continuous paramete r monitoring system to continuously monitor catalyst inlet temp erature according to permit condition 10.11;

and

c. The owner or operator record ed the catalyst pressure drop and inlet temperature during the initial performance test.

2. If the owner or operator limits the concentration of carbon monoxide emissions using an oxidation catalyst and continuous paramete r monitoring system, initial compliance is demonstrated by conducting an initial performa nce test using the applicable procedures described in permit condition 10.9 and if:

a. The average carbon monoxide concentration de termined from the initial performance test is less than or equal to the carbon monoxide emission limit in permit condition 10.2;

b. The owner or operator inst alled a continuous paramete r monitoring system to continuously monitor catalyst inlet temp erature according to permit condition 10.11;

and

c. The owner or operator record ed the catalyst pressure drop and inlet temperature during the initial performance test.

3. If the owner or operator reduces carbon monoxide emissions and does not use an oxidation catalyst, initial compliance is demonstrated by conducting an initial performance test using the a pplicable procedures descri bed in permit condition 10.9 and

if:

a. The average reduction of carbon monoxide emissions determined from the initial performance test achieves the required carbon monoxide percent reduction in permit condition 10.2;

b. The owner or operator inst alled a continuous paramete r monitoring system to continuously monitor operating paramete rs approved by the Secretary, if any, according to permit condition 10.11; and

c. The owner or operator record ed the approved operating para meters, if any, during the initial performance test.

4. If the owner or operator limits the concentration of carbon monoxide emissions and does not use an oxidation catalyst, initial compliance is demonstr ated by conducting an initial performance test using the a pplicable procedures descri bed in permit condition 10.9 and

if:

a. The average carbon monoxide concentration de termined from the initial performance test is less than or equal to the carbon monoxide emission limit in permit condition 10.2;19 b. The owner or operator inst alled a continuous paramete r monitoring system to continuously monitor operating paramete rs approved by the Secretary, if any, according to permit condition 10.11; and

c. The owner or operator record ed the approved operating para meters, if any, during the initial performance test.

5. If the owner or operator redu ces carbon monoxide emissions using an oxidation catalyst and continuous emission monitoring system, initial compliance is demonstrated if:

a. The owner or operator inst alled the continuous emission monitoring system to continuously monitor carbon monoxide and either oxygen or carbon dioxide

emissions at both the inlet and outlet of the oxidation catalyst according to permit condition 10.10;

b. The owner or operator conducted a perfor mance evaluation of the continuous emission monitoring system using 40 CFR Part 60, Appendix B, Performance Specification 3 and 4A; and

c. The average reduction of carbon monoxide as calculated using permit condition 10.9 equals or exceeds the required percent re duction in permit condition 10.2. The initial performance test comprises the first 4-hour period after successf ul validation of the continuous emission monitoring system. Comp liance is based on the average percent

reduction achieved durin g the 4-hour period.

6. If the owner or operator lim its the concentration of car bon monoxide emissions using a oxidation catalyst and continuous emission monitoring system, initial compliance is

demonstrated if:

a. The owner or operator inst alled a continuous emission monitoring system to continuously monitor carbon monoxide and either oxygen or carbon dioxide

emissions at the outlet of the oxidation catalyst according to permit condition 10.10;

b. The owner or operator conducted a perfor mance evaluation of the continuous emission monitoring system using 40 CFR Part 60, Appendix B, Performance Specification 3 and 4A; and

c. The average concentration of carbon monoxide as calculated using permit condition 10.9 is less than or equal to the carbon monoxide emission limit in permit condition 10.2. The initial performance test comprise s the first 4-hour pe riod after successful

validation of the continuous emission mon itoring system. Compliance is based on the average concentration measur ed during the 4-hour period.

This condition applies to Unit #1, #2, #3 and #4.

10.7 Initial performance test for nonemergency engines may not be required In accordance with ARSD 74:36:08:40, as referenced to 40 CFR §§ 63.6612(b) and 63.6670(c)(5), the owner or operator is not require d to conduct the initial performance testing on a nonemergency engine for which a performance test was previously conducted provided the test meets all of the following requirements:

1. The test shall have been conducted using the same methods specified in this chapter and the methods were followed correctly;

2. The test shall not be older than 2 years;20 3. The test shall be reviewed and accepted by the Administrator of EPA through the Secretary; and

4. Either no process or equipment changes sh all have been made since the test was performed or the owner or operator shall be able to demonstrate the results of the performance test, with or w ithout the adjustments, reliab ly demonstrates compliance despite process or equipment changes.

This condition applies to Unit #1, #2, #3 and #4.

10.8 Subsequent performance test sc hedule for nonemergency engines In accordance with ARSD 74:36:08:40, as referenced to 40 CFR § 63.6615, if a continuous emission monitoring system is not being used, th e owner or operator shall conduct subsequent performance tests every 8,760 hours or 5 years, whichever comes first. This condition applies to Unit #1, #2, #3 and #4.

10.9 Performance test procedures for nonemergency engines In accordance with ARSD 74:36:08:40, as refe renced to 40 CFR §§ 63.7(e)(3) and 63.6620, the owner or operator shall conduct each perf ormance test according to the following:

1. If the owner or operator redu ces carbon monoxide emissions, the owner or operator shall:

a. Measure the oxygen at the inlet and outlet of the control devi ce with a portable oxygen analyzer using ASTM Method D6522-00 (2005) or 40 CFR Part 60, Appendix A, Methods 3, 3A, or 3B. Oxygen m easurements shall be made at the same time as the measurements for carbon monoxide concentrations; and

b. Measure the carbon monoxide at the inlet a nd outlet of the control device with a portable carbon monoxide analyzer us ing ASTM D6522-00 (2005), ASTM D6348- 03, 40 CFR Part 60, Appendix A, Methods 10, or 40 CFR Part 63, Appendix A,

Method 320. The carbon monoxide concentratio ns shall be at 15 percent oxygen, dry

basis.

2. If the owner or operator lim its the concentration of carbon monoxide emissions, the owner or operator shall:

a. Select the sampling port locat ions and the number of tr averse points using 40 CFR Part 60, Appendix A, Method 1 or 1A. If us ing a control device, the sampling site shall be located at the outlet of the control device;

b. Determine the oxygen concentration at the sampling port location using 40 CFR Part 60, Appendix A, Method 3, 3A, or 3B or ASTM Method D6522-00 (2005). Oxygen

concentration measurements shall be made at the same time and location as the measurements for carbon monoxide concentrations;

c. Measure the moisture content at the sa mpling port location using 40 CFR Part 60, Appendix A, Method 4, 40 CFR Part 63, A ppendix A, Method 320, or ASTM D6348-

03. Moisture content measurements shall be made at the same time and location as the measurements for carbon monoxide concentrations; and

d. Measure the carbon monoxide concentrations at the sampling port for the exhaust of the nonemergency engine using 40 CFR Part 60, Appendix A, Method 10, 40 CFR21 Part 63, Appendix A, Method 320, ASTM D6522-00 (2005), or ASTM D6348-03.

The carbon monoxide concentration shall be at 15 percent oxygen, dry basis.

3. The owner or operator shall conduct three sepa rate test runs for each performance test

and each test run shall last at least 1 hour. Upon receiving approval from the Secretary, results of a test run may be replaced with the results of an additional test run in the event

that:

a. A sample is accidentally lost after the testing team leaves the site;

b. Conditions occur in which one of the thre e runs shall be discontinued because of forced shutdown;

c. Extreme meteorological conditions occur; or

d. Other circumstances occur that are beyond the control of the owner or operator.

4. Equation 10-1 shall be used to determ ine compliance with the percent reduction requirement;

Equation 10-1 – Demonstrating compliance with percent reduction

ܴ ൌ ܥ ௜ ܥ െ
௢ ܥ ௜ ൈ 100

Where:

 C i = Concentration of carbon monoxid e at the control device inlet;

 C

o = Concentration of carbon monoxide at the control device outlet; and

 R = Percent reduction of carbon monoxide emissions.

5. The owner or operator shall no rmalize the carbon monoxide c oncentrations at the inlet

and outlet of the control devi ce to a dry basis and to 15 pe rcent oxygen or an equivalent percent of carbon dioxide. If pollutant concentrations ar e corrected to 15 percent oxygen

and carbon dioxide concentrations is meas ured in lieu of oxygen concentration measurement, a carbon dioxide correction fact or is needed. The carbon dioxide correction

factor shall be calculated as follows:

a. Calculate the fuel-specific F

o value for the fuel burned during the test using values obtained from 40 CFR Part 60, Appendix A, Method 19, section 15.2 and Equation 10-2;

Equation 10-2 – Fuel-specific F

o value

ܨ

௢ ൌ ܨ0.209 ௗ
ܨ

௖ Where:

 F
o = Fuel factor based on the ratio of oxygen volume to ultimate carbon dioxide volume produced by the fuel at zero percent excess air;

 0.209 = Fraction of air that is oxygen, percent/100;

 F d = Ratio of the volume of dry effluent gas to the gross calorific value of the fuel from 40 CFR Part 60, Method 19, dry standard cubic foot per 10 6 Btus; and

 F
c = Ratio of the volume of carbon dioxide produ ced to the gross calor ific value of the fuel from 40 CFR Part 60, Method 1 9, dry standard cubic foot per 10 6 Btus.22 b. Calculate the carbon dioxide correction factor for correcting measurement data to 15 percent oxygen using Equation 10-3; and

Equation 10-3 – Carbon dioxide correction factor

ܺ ஼ைଶ ൌ 5.9

ܨ

௢ Where:

 X CO2 = Carbon dioxide correcti on factor, percent; and

 5.9 = 20.9 percent oxygen-15 percent oxygen, th e defined oxygen correction value,

percent.

c. Calculate the carbon monoxide gas concentr ations adjusted to 15 percent oxygen using carbon dioxide and Equation 10-4;

Equation 10-4 – Carbon dioxide correction factor

ܥ

௔ௗ௝ ൌ ܥ ௗ ܺ ஼ைଶ

ܱ2ܥ% Where:

 C adj = Calculated concentrati on of carbon monoxide adjust ed to 15 percent oxygen;

 Cd = Measured concentration of carbon monoxide, uncorrected; and

 %CO2 = Measured carbon dioxide con centration, dry basis, percent.

6. If the owner or operator complies with the emission limit to reduce carbon monoxide and is not using an oxidation cat alyst, the owner or operator shall submit the operational limits to be established during the initial performa nce test and continuously monitor those parameter(s) thereafter or request approval of no operating limits. The initial performance

test shall not be conducted until after the proposed operati onal limits or no operational limitation has been approved by the Secretary. The submittal for proposing operational limits shall include the following:

a. Identification of the specific parameters the owner or operator proposes to use as operating limits;

b. A discussion of the relationship between th ese parameters and ha zardous air pollutant emissions, identifying how hazardous air pollutant emissions change with changes in these parameters, and how limits on these parameters will serve to limit hazardous air pollutant emissions;

c. A discussion of how the owner or operat or will establish the upper and/or lower values for these parameters which will esta blish the limits on these parameters in the operating limits;

d. A discussion identifying the methods the owner or operator will use to measure and the instruments the owner or operator will us e to monitor these parameters, as well as the relative accuracy and precision of these methods and instruments; and

e. A discussion identifying the frequency a nd methods for recalibrating the instruments the owner or operator will use for monitoring these parameters.

7. The submittal for proposing no operational lim itations shall include the following:23 a. Identification of the parameters associat ed with operation of the nonemergency engine and any emission control device wh ich could change intentionally (i.e., operator adjustment, automatic controller ad justment) or uninten tionally (i.e. wear and tear, error) on a routine basis or over time;

b. A discussion of the relationship, if any, between changes in the parameters and changes in hazardous air pollutant emissions;

c. For the parameters which could change in such a way as to in crease hazardous air pollutant emissions, a discussion of whethe r establishing limits on the parameters would serve to limit hazardous air pollutant emissions;

d. For the parameters which could change in such a way as to in crease hazardous air pollutant emissions, a discussion of how th e owner or operator could establish upper and/or lower values for the parameters wh ich would establish limits on the parameters in operating limits;

e. For the parameters, a discussion identifying the methods the owner or operator could use to measure them and the instruments the owner or operator could use to monitor them, as well as the relative accuracy and precision of the methods and instruments;

f. For the parameters, a discussion iden tifying the frequency and methods for recalibrating the instruments the owner or operator could use to monitor them; and

g. A discussion of why, from the owner’s or ope rator’s point of view, it is infeasible or unreasonable to adopt the para meters as operating limits.

8. The engine percent load during a performan ce test shall be determined by documenting the calculations, assumptions, and measurement devices used to measure or estimate the percent load in a specific application. A written report of the average percent load determination shall be included in the notification of compliance status. The following information shall be included in the written report:

a. The engine model number;

b. The engine manufacturer;

c. The year of purchase;

d. The manufacturer's site -rated brake horsepower;

e. The ambient temperature, pressure, and humidity during the performance test;

f. All assumptions made to estimate or calc ulate percent load du ring the performance test shall be clearly explained; and

g. If measurement devices such as flow mete rs, kilowatt meters, beta analyzers, stain gauges, etc. are used, the model number of the measurement device, and an estimate of its accurate in percentage of true value shall be provided.

If the nonemergency engine is non-operational bu t subject to performanc e testing, the owner or operator is not required to start the nonemergency engine solely to conduct the performance test. However, the owner or operator shall conduct the performance test when the nonemergency engine is started up again. This c ondition applies to Unit #1, #2, #3 and #4.

10.10 Requirements for a continuous emission monitoring system In accordance with ARSD 74:36:08:40, as referen ced to 40 CFR § 63.6625(a), if the owner or operator elects to install a c ontinuous emission monitoring system for demonstrating compliance, the owner or operator sh all install, operate, and mainta in a continuous emission monitoring24 system to monitor carbon monoxi de and either oxygen or ca rbon dioxide that meets the following requirements. If the owner or operato r is meeting the requirement to reduce carbon monoxide emissions, the continuous emission monito ring system shall be installed at both the

inlet and outlet of the control de vice. If the owner or operator is meeting a requirement to limit

the concentration of carbon monoxide, the continuous emi ssion monitoring system shall be

installed at the outlet of the control device:

1. Each continuous emission monitoring system sh all be installed, operated, and maintained according to the applicable performance spec ifications of 40 CFR Part 60, Appendix B;

2. The owner or operator shall conduct an in itial performance evaluation and an annual relative accuracy test audit (RATA) of each continuous emission monitoring system according to the applicable performance spec ifications of 40 CFR Part 60, Appendix B as well as daily and periodic data quality checks in accordance with 40 CFR Part 60, Appendix F, Procedure 1;

3. Each continuous emission monitoring system sh all complete a minimum of one cycle of operation (i.e., sampling, analyzing and data recording) for each successive 15-minute period. The owner or operator sh all have at least two data po ints, with each representing a different 15-minute period, to ha ve a valid hour of data; and

4. The continuous emission monitoring system data shall be reduced to 1-hour average computed from four or more data points equally spaced over each 1-hour period, except during periods when calibration, quality assura nce, or maintenance activities are being performed. During these periods, a valid hourly average shall c onsist of at least two data points with each representing a 15-minute pe riod. Alternatively, an arithmetic or integrated 1-hour average of continuous em ission monitoring data may be used. The continuous emission monitoring data shall be recorded in parts per million at 15 percent oxygen or the equivalent car bon dioxide concentration.

This condition applies to Unit #1, #2, #3 and #4.

10.11 Requirements for a continuous parameter monitoring system In accordance with ARSD 74:36:08:40, as referen ced to 40 CFR § 63.6625(b), if the owner or operator elects to install a continuous parameter monitori ng system for demonstrating compliance, the owner or operato r shall install, operate, and maintain a continuous parameter monitoring system according to the following requirements:

1. The owner or operator shall pr epare a site-specific monitori ng plan that addresses the monitoring system design, data collection, and the quality assurance and quality control

elements outlined below:

a. The performance criteria and design speci fications for the monitoring system equipment, including the sample interface, detector signal analyzer, and data acquisition and calculations;

b. Sampling interface (i.e., thermocouple) locati on such that the monitoring system will provide representative measurements;

c. Equipment performance evaluations, syst em accuracy audits, or other audit procedures;25 d. Initial and any subsequent calibration of the continuous parameter monitoring system;

e. Determination and adjustment of the calib ration drift of the continuous parameter monitoring system;

f. Preventive maintenance of the continuous parameter monitoring system, including spare parts inventory;

g. Data recording, calculations, and reporting;

h. Accuracy audit procedures, includi ng sampling and analysis methods;

i. Program of corrective action for a malfunctioning continuo us parameter monitoring

system; j. Ongoing operation and maintenance procedures that are consistent with good air pollution control practices and meet at least the following:

i. The owner or operator shall keep the necessary parts fo r routine repairs of the equipment associated with the contin uous parameter monitoring system; and

ii. All continuous parameter monitoring syst ems shall be installed, operational, and the data verified prior to or in conjun ction with conducting th e performance test. Verification of operational st atus shall at a minimum include completion of the manufacturer’s written specification or recommendations for installation, operation, and calibration of the system.

k. The following recordkeeping and reporting requirements:

i. All required continuous parameter mon itoring system measurements including monitoring data recorded during unavoi dable continuous parameter monitoring system breakdowns and out-of-control periods;

ii. The date and time identifying each period during which the continuous parameter monitoring system was inopera tive except for zero (low-level) and high-level checks;

iii. The date and time identifying each period during which the continuous parameter monitoring system was out of control. A continuous parameter monitoring system is out of control if the zero (low-level) or high-level calibration drift exceeds two times the appl icable calibration drift specification or

the relevant standard or the continuous parameter monitoring system fails a performance test audit, relative accuracy audit, relative accuracy test audit or linearity test audit. The beginning of the out-of-control period is the hour the owner or operator conducts a performance check that i ndicates an exceedance of the performance requirements. The end of the out-of-control period is the hour following completion of corrective acti on and successful demonstration the system is within the allowable limits;

iv. The specific identification (i.e., the date and time of commencement and completion) of each period of excess emissions and parameter monitoring exceedances that occurs during startups , shutdowns, and malfunctions of the

generator;

v. The specific identification (i.e., the date and time of commencement and completion) of each time period of exce ss emissions and parameter monitoring exceedances that occurs during periods other than startups, shutdowns, and malfunctions of the generator;

vi. The nature and cause of any malfunction (if known);26 vii. The corrective action taken or preventive measures adopted;

viii. The nature of the repairs or adjustment s to the continuous parameter monitoring system that was inoperati ve or out of control;

ix. The total process operating tim e during the reporting period;

x. All procedures that are part of a quality control program developed and implemented for the continuous pa rameter monitoring system; and

xi. The owner or operator shall s ubmit a copy of a written repo rt of the results of the continuous parameter monitoring system performance evaluation within 60 days of completion of the pe rformance evaluation.

2. The owner or operator shall in stall, operate, and mainta in each continuous parameter monitoring system in continuous operation accord ing to the procedures in the owner’s or operator’s site-specific monitoring plan;

3. The continuous parameter monitoring system shall collect data at least once every 15 minutes;

4. For a continuous parameter monitoring syst em measuring a temperature range, the temperature sensor shall have a minimum to lerance of 2.8 degrees Celsius (5 degrees Fahrenheit) or 1 percent of the meas urement range, whichever is larger;

5. The owner or operator shall conduct the c ontinuous parameter monitoring system equipment performance evaluation, system accu racy audits, or other audit procedures specified in the owner’s or operator’s site-s pecific monitoring plan at least annually; and

6. The owner or operator shall conduct a pe rformance evaluation of each continuous parameter monitoring system in accordance with the owner’s or operator’s site-specific monitoring plan.

The owner or operator shall maintain these writ ten procedures on record for the life of the facility or until the faci lity is no longer subject to this permit condition and shall be made available for inspection. If the wr itten procedures are revised, th e owner or operator shall keep previous (i.e., superseded) versions of the perf ormance evaluation plan on record to be made available for inspection, upon request, by the Secr etary, for a period of 5 years after each

revision.

The owner or operator may request approval of monitoring system quality assurance and quality control procedures altern ative to those specified above for th e owner’s or operator’s site-specific monitoring plan. This condition applies to Unit #1, #2, #3 and #4.

10.12 Installation of open or closed crankcase system In accordance with ARSD 74:36:08:40, as referenced to 40 CFR § 63.6625(g), if the nonemergency engine is not equi pped with a closed crankcase ve ntilation system, the owner or operator shall comply with one of the following:

1. Install a closed crankcase ventilation system that prevents crankcase emissions from being emitted to the atmosphere; or

2. Install an open crankcase filtration emission control system that reduces emissions from the crankcase by filtering the exhaust stream to remove oil mist, particulates, and metals.27 The owner and operator shall foll ow the manufacturer's specified maintenance requirements for operating and maintaining the ope n or closed crankcase ventilation system and replacing the crankcase filters, or can request the Secretary to approve different maintenance requirements that are as protective as manufacturer’s requireme nts. This condition applies to Unit #1, #2, #3 and

#4.

10.13 Minimizing engine time during startup In accordance with ARSD 74:36:08:40, as referenced to 40 CFR § 63.6625(h), the owner or operator shall minimize the nonemergency engine ’s time spent at idle during startup and minimize the nonemergency engine's startup time to a period needed for appropriate and safe loading of the nonemergency engine, not to ex ceed 30 minutes, after which time the emission standards in permit condition 10.2 apply. This condition applies to Unit #1, #2, #3 and #4.

10.14 Monitoring and collecting data In accordance with ARSD 74:36:08:40, as referenced to 40 CFR § 63.6635, the owner or operator shall continuousl y monitor the nonemergency engine at all times when it is operating, except for monitor malfunctions, associated re pairs, required perfor mance evaluations, and required quality assurance or control activit ies. A monitoring malfunction is any sudden, infrequent, not reasonably preventable failure of the monitoring to provide valid data. Monitoring failure caused in part by poor mainte nance or carless operation are not malfunctions. The owner or operator shall not use data recorded during mon itoring malfunctions, associated repairs, and required quality assurance or control ac tivities in data averages and calculations used to report emission or operating levels. This condition applies to Unit #1, #2, #3 and #4.

10.15 Demonstrating continuous compliance In accordance with ARSD 74:36:08:40, as referenced to 40 CFR § 63.6640(a), the owner or operator shall demonstrate continuous compliance with each emission limit in permit condition 10.2 and operating limit in permit condition 10.3 according to the following methods:

1. If the owner or operator reduced carbon monoxi de emissions or limits the concentration of carbon monoxide in the nonemergency e ngine’s exhaust and using a continuous emission monitoring system, demonstrating continual compliance with permit condition 10.2 is demonstrated by:

a. Collecting the monitoring data according to permit condition 10.10;

b. Reducing the measurements to 1-hour averages;

c. Calculating the percent reduction or c oncentration of carbon monoxide emission according to permit condition 10. 9;

d. Demonstrating the catalyst achieves th e required percent re duction of carbon monoxide emissions over the 4-hour averaging period or the emissions remain at or below the carbon monoxide concentration limit; and

e. Conduct an annual relative accu racy test audit of the c ontinuous emission monitoring system using 40 CFR Part 60, Appendix B, Performance Specification 3 and 4A as well as daily and periodic data quality checks in accordance with 40 CFR Part 60, Appendix F, Procedure 1.28 2. If the owner or operator redu ces carbon monoxide emissions or limits the concentration of carbon monoxide in the nonemergency engine’s exhaust and uses a oxidation catalyst, demonstrating continual compliance with permit condition 10.2 is demonstrated by:

a. Conducting performance tests every 8,760 hours or 5 years, whichever comes first,

for carbon monoxide to demonstrate the re quired carbon monoxide percent reduction

is achieved or the emissions remain at or below the carbon monoxide concentration limit;

b. Collecting the catalyst inlet temperature data according to permit condition 10.11;

c. Reduce the data to 4-ho ur rolling averages;

d. Maintain the 4-hour rolling averages within the operating limit for the catalyst inlet temperature; and

e. Measure the pressure drop across the catal yst once per month and demonstrate the pressure drop across the catalyst is with in the operation limit established during the performance test.

3. If the owner or operator redu ces carbon monoxide emissions or limits the concentration of carbon monoxide in the nonemergency engi ne’s exhaust and does not use a oxidation catalyst, demonstrating con tinual compliance with permit condition 10.2 is demonstrated by:

a. Conducting performance tests every 8,760 hours or 5 years, whichever comes first,

for carbon monoxide to demonstrate the re quired carbon monoxide percent reduction

is achieved or the emissions remain at or below the carbon monoxide concentration limit;

b. Collecting the approved operating parame ter data, if any, according to permit condition 10.11;

c. Reduce the data to 4-hour rolling averages; and

d. Maintain the 4-hour rolling averages with in the operating lim it for the operating parameters established during the performance test.

This condition applies to Unit #1, #2, #3 and #4.

10.16 Reporting deviations In accordance with ARSD 74:36:08:40, as referenced to 40 CFR § 63.6640(b), the owner or operator shall report instances wh en the nonemergency engine did not meet the emission limits in permit condition 10.2 or operating limits in pe rmit condition 10.3. These deviations shall be reported in the annual report required in permit condition 10.19. If the owner or operator changes the catalyst, the owner or operator shall reesta blish the values of th e operating parameters measured during the initial performance test. When the owner or operator reestablishes the values of the operating parameters, the owner or ope rator shall also conduct a performance test to demonstrate the owner or operator is meeting the required emission limits in permit condition 10.2. This condition applies to Unit #1, #2, #3 and #4.

10.17 Performance test notifications In accordance with ARSD 74:36:08:40, as refe renced to 40 CFR §§ 63.7(b)(1), 63.7(c), 63.8(e)(3), and 66.6645(g), the owner or operator sha ll submit a Notification of Intent to conduct a performance test at least 60 days before the pe rformance test is scheduled to begin to allow the29 Secretary an opportunity to review and approve the site-specific te st plan and have an observer present during the test. The site-specific test plan shall include:

1. A test program objectives and summary;

2. The test schedule;

3. Data quality objectives, which are the pretest exp ectations of precision, accuracy, and completeness data;

4. An internal quality assurance program which includes, at a minimum, the activities planned by routine operators a nd analysts to provide an assessment of the continuous monitoring system performance; and

5. An external quality assurance program which includes, at a minimum, systems audits that include the opportunity for onsite evaluation of instrument calibra tion, data validation, sample logging, and documentation of quality control data and field maintenance

activities.

This condition applies to Unit #1, #2, #3 and #4.

10.18 Notification of compliance status In accordance with ARSD 74:36:08:40, as refere nced to 40 CFR §§ 63.9(h)(2)(ii), 63.6630(c) and 63.6645(h), the owner or operator shall s ubmit a Notification of Compliance Status containing the following information for each performance test or compliance demonstration:

1. The methods used to determine compliance;

2. The results of any performance tests, continuous monitoring system performance evaluations, and/or other monitoring procedures or methods conducted;

3. The methods used for determining continui ng compliance, includi ng a description of monitoring and reporting requi rements and test methods;

4. The quantity of carbon monoxide emitted by the nonemergency engine reported in the appropriate units for demonstrating compliance with permit condition 10.2;

5. A description of the air pollution contro l device (or method) for each nonemergency engine, including the control efficiency (p ercent) for each control device (or method);

and

6. A statement by the owner or operator as to whether the source has complied with the relevant standard or other requirements.

If the compliance demonstration does not require a performance test, the owner or operator shall submit the Notification of Compliance Status with in 30 days after completion of the compliance demonstration. A Notification of Compliance Status for each performance test and compliance demonstration that involves a performance test shall be submitted within 60 days after completion of the performance test. This condition applies to Unit #1, #2, #3 and #4.

10.19 Annual compliance report In accordance with ARSD 74:36:08:40, as referenced to 40 CFR § 63.6650(a), (b), (c), (d), and (e), the owner or operator sh all submit an annual report wh ich contains the following:30 1. Company name and address;

2. Statement by a responsible official, with th at official's name, title, and signature, certifying the accuracy of the content of the report;

3. Date of report and beginning and ending dates of th e reporting period;

4. If a malfunction occurred duri ng the reporting peri od, the compliance re port shall include the number, duration, and a brief description for each type of malfunction which occurred during the reporting period and which caused or may have caused the emission limit in permit condition 10.2 to be exceeded. The repor t shall also include a description of actions taken by the owner or operator dur ing the malfunction to minimize emissions, including actions taken to correct a malfunction;

5. If there are no deviations from any emissi on limit in permit cond ition 10.2 or operating limits in permit condition 10.3, a statement that there were no deviations from the emission limits or operating lim its during the reporting period;

6. If there were no periods during which the c ontinuous monitoring syst em (i.e., continuous emission monitoring system and/or continuous parameter monitoring system) was out-ofcontrol as specified in permit condition 10.11, a statement there were no periods during which the continuous monitoring system was out-of-control during the reporting period;

7. For each deviation where the owner or opera tor is not using a continuous monitoring system to comply, the semiannual re port shall contain the following:

a. The total operating time of the nonemergency engine involv ed with the deviation; and

b. Information on the number, duration, and cause of deviations, including unknown causes, and the corrective action taken;

8. For each deviation where the ow ner or operator is using a continuous monitoring system to comply, the semiannual report shall contain the following:

a. The date and time each malfunction started and stopped;

b. The date, time, and duration that each con tinuous monitoring system was inoperative, except for zero (low-level) and high-level checks;

c. The date, time, and duration that each c ontinuous monitoring system was out-ofcontrol, including a description of any corrective actions taken;

d. The date and item each deviation started and stopped, and whether each deviation occurred during a period of malf unction or during another period;

e. A summary of the total duration of the de viation during the repor ting period and total duration as a percent of the total operati ng time of the generato r during the reporting period;

f. A summary of the total duration of con tinuous monitoring system downtimes during the reporting period and tota l duration of continuous m onitoring system downtime as a percent of the total opera ting time of the generator during the reporting period;

g. An identification of each parameter and pollutant that was monitored for the

generator;
h. A brief description of the generator;

i. A brief description of the continuous monitoring system; j. The date of the latest continuous mon itoring system certification or audit; and

k. A description of any changes in the con tinuous monitoring system, processes, or

controls since the la st reporting period.31 The first annual report shall cover the pe riod beginning May 3, 2013 and ending on December 31, 2013, and be postmarked or delivered no la ter than January 31, 2014. Each subsequent annual report shall cover the annual reporting period from January 1 through December 31. Each subsequent annual report shall be postmarked or delivered no later than January 31. This condition applies to Unit #1, #2, #3 and #4.

10.20 Recordkeeping for nonemergency engines In accordance with ARSD 74:36:08:40, as referen ced to 40 CFR §§ 63.6655(a), (b), and (d) and 63.6660, the owner or operator shall maintain the following records:

1. A copy of each notification and report the owner or operator subm itted to comply with this chapter, including all documentation supporting a ny Initial Notification or Notification of Compliance Status reports;

2. Records of the occurrence and duration of each malfunction of operation or the air pollution control and monitoring equipment;

3. Records of performance tests and performance evaluations;

4. Records of all required maintenance pe rformed on the air pollution control and monitoring equipment;

5. Records of actions taken during periods of malfunction to minimize emissions, corrective actions taken or preventive measures adopt ed to restore a malfunctioning process, air pollution control, and/or monitoring equi pment to its normal or usual manner of operation;

6. For each continuous monitoring system, the ow ner or operator shall keep the following

records:

a. All measurements during periods of una voidable continuous monitoring system breakdowns and out-of-control periods;

b. The date and time identifying each period during which the continuous monitoring system was inoperative except for zero (low-level) and high-level checks;

c. The date and time identifying each period during which the continuous monitoring system was out-of-control;

d. The date and time of each period of ex cess emissions and parameter monitoring exceedances that occurs during star tups, shutdowns, and malfunctions;

e. The date and time of each time period of excess emissions and parameter monitoring exceedances during periods other than startups, shutdowns, and malfunctions;

f. The nature of the repairs or adjustments to the continuous monitoring system that was inoperative or out of control;

g. The total process operating tim e during the reporting period;

h. All procedures that are part of the qualit y control program developed in accordance with paragraph (1) of permit condition 10.11;

i. All required measurements needed to demonstrate compliance with a relevant standard including, but not limited to, 15-mi nute averages of continuous monitoring system data, raw performance testing meas urements, and raw performance evaluation measurements that support data submitted in the annual report; j. If the owner or operator inst alls a continuous emissions monitoring system where the system installed is automated and the calcu lated data averages do not exclude periods32 of continuous emission monitoring system breakdown or malfunction, in lieu of maintaining a file of all continuous emission monitoring system sub-hourly measurements as required under subparagraph (6)(b) of this permit condition, the owner or operator shall retain the most re cent consecutive three averaging periods of sub-hourly measurements and a file that cont ains a hard copy of the data acquisition system algorithm used to reduce the measured data into the reportable form of the

standard. An automated continuous emissi on monitoring system records and reduces the measured data to the form of the pollu tant emission standard through the use of a computerized data acquisition system;

k. If the owner or operator inst alls a continuous emissions monitoring system where the measured data is manually reduced to obtai n the reportable form of the standard and where the calculated data averages do not exclude periods of continuous emissions monitoring system breakdown or malfunction, in lieu of maintaining a file of all continuous emissions monitoring system s ub-hourly measurements as required under subparagraph (6)(b) of this permit condition, the owner or operator shall retain all sub-hourly measurements for the most re cent reporting peri od. The sub-hourly

measurements shall be retained for 120 da ys from the date of the most recent summary or excess emission report;

l. All results of performance tests and c ontinuous monitoring system performance evaluations;

m. All measurements as may be necessary to determine the conditions of performance tests and performance evaluations;

n. All continuous monitoring system calibration checks; and

o. All adjustments and maintenance performed on the continuous monitoring system;

p. Previous versions of the performance eval uation plan as required in permit condition 10.11; and

q. Requests for alternatives to the relative accuracy test for the continuous monitoring system as required in permit condition 10.11.

7. Records required in permit condition 10.15 to show continuous compliance with the emission limits in permit condition 10.2 and operating limits in permit condition 10.3.

All records shall be maintained in a form suita ble and readily available for expeditious review for 5 years following the date of each occurrence, measurement, maintenance, corrective action, report or record. At a minimum, the most recent 2 years of data shall be retained on site. The remaining 3 years of data may be retained o ff site. This condition applies to Unit #1, #2, #3 and

#4.

10.21 Circumvention not allowed In accordance with ARSD 74:36:08:03, as referen ced to 40 CFR § 63.4(b), no owner or operator shall build, erect, install, or use any article, machine, equipment, or process to conceal an

emission that would otherwise constitute nonc ompliance with a relevant standard. Such concealment includes, but is not limited to the use of diluents to achieve compliance with a

relevant standard based on the concentration of a pollutant in the efflue nt discharged to the atmosphere. This condition applies to Unit #1, #2, #3 and #4.