SPECIAL CONDITIONS 

 Permit Numbers 76474 and PSD-TX-1056 

EMISSION RATES AND PERMIT REPRESENTATIONS

 1. This permit covers only those sources of emissions listed in the attached table entitled 

“Emission Sources - Maximum Allowable Emission Rates,” (MAERT) and those sources are 

limited to the emission limits and other conditions specified in that attached table. This permit 

authorizes start-up, shutdown, and maintenance (SSM) activities which comply with the 

emission limits in the MAERT and the opacity limit of Special Condition No.11. 

 2. Emission limits are based upon representations in the permit application July 27, 2005 as 

subsequently updated. 

FEDERAL APPLICABILITY

 3. The pulverized coal (PC) boilers, identified as emission point numbers (EPN) E-OGU1 and 

E-OGU2, shall comply with applicable requirements of EPA regulations in 

Title 40 Code of Federal Regulations Part 60 (40 CFR Part 60), Standards of Performance for 

New Stationary Sources, Subpart A, General Conditions, and Subpart Da, Standards of 

Performance for Electric Utility Steam Generating Units. 

 4. The auxiliary boilers, identified as EPN E-OGAB, shall comply with the applicable 

requirements of 40 CFR 

A. Part 60, Subpart A, and Subpart Db, Standards of Performance for Industrial, 

Commercial, and Institutional Boilers; and 

B. Part 63, Subpart A, and Subpart DDDDD, National Emission Standards for Hazardous 

Air Pollutants for Industrial, Commercial, and Institutional Boilers and Process Heaters. 

 5. The stationary diesel engines, identified as EPNs E-OGEG and E-OGFP, shall comply with: 

A. The applicable requirements of 40 CFR Part 60, Subpart A, and Subpart IIII, Standards 

of Performance for Stationary Compression Ignition Internal Combustion Engines, as 

adopted. 

B. The initial notification requirements of 40 CFR § 63.6645(d), as specified in 40 CFR 

Part 63, Subpart ZZZZ, National Emissions Standards for Hazardous Air Pollutants for 

Stationary Reciprocating Internal Combustion Engines, § 63.6590(b)(1)(I). 

 6. The lignite processing, storage and conveying facilities, identified in the following Table, shall 

comply with the applicable requirements of 40 CFR Part 60, Subpart A, and Subpart Y,

 Standards of Performance for Coal Preparation Plants. 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 2 

Lignite Handling Facilities Subject to NSPS Subpart Y 

Facility Facility 

Identification 

Number 

Emission 

Points 

EPNs 

Railcar Unloading 

Building 

F-OGLT1 Vents (2) E-OGLTHV1 

E-OGLTHV2 

Track Hoppers F-OGLT2 Vent E-OGLTHBV 

No. 2 Transfer 

Conveyor 

F-OGLCFT3 Vent E-OGLCFT3V 

Lignite Silo 1 F-OGLSILO1 Vent (Fabric filter) E-OGSILO1 

Lignite Silo 2 F-OGLSILO2 Vent (Fabric filter) E-OGSILO2 

Silo and Emergency 

Stockout Reclaim 

F-OGSSPR Vent E-OGSSPRV 

Crusher House F-OGLT9 

F-OGCFT9 

F-OGCFT11 thru 13 

Vents (2) E-OGCHV1 

E-OGCHV2 

Crusher House 

 Surge Bin 

F-OGCFT10 Vent (Fabric Filter) E-OGCHBFV 

Sample House F-OGSH Vent E-OGSHV 

Surge Bin 

 Transfer Tower - 

 External Structure 

F-OGCFT18 thru 22 Vent E-OGSBTTV 

Surge Bin Transfer 

Tower - Bin 

F-OGCFT17 

F-OGCFT18 

Vent (Fabric Filter) E-OGSBTTBV 

Transfer Tower 1A F-OGCFT23 Vent E-OGTT1AV 

Unit 1 South Side 

Tripper House 

F-OGU1SS Vent (Fabric Filter) E-OGU1SSV 

Transfer Tower 1B F-OGCFT24 Vent E-OGTT1BV 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 3 

Facility Facility 

Identification 

Number 

Emission 

Points 

EPNs 

Unit 1 North Side 

 Tripper House 

F-OGUINS Vent (Fabric Filter) E-OGU1NSV 

Transfer Tower 2A F-OGCFT26 Vent E-OGTT2AV 

Unit 2 South Side 

 Tripper House 

F-OGU2SS Vent (Fabric Filter) E-OGU2SSV 

Transfer Tower 2B F-OGCFT25 Vent E-OGTT2BV 

Unit 2 North Side 

 Tripper House 

F-OGU2NS Vent (Fabric Filter) E-OGU2NSV 

 7. The limestone processing, storage and conveying facilities identified in the following table, 

shall comply with the applicable requirements of 40 CFR 60, Subpart A, and Subpart OOO, 

Standards of Performance for Non-metallic Mineral Processing Plants. 

Limestone Processing Facilities Subject to NSPS Subpart OOO 

Facility Facility 

Identification 

Number 

Emission 

Points 

EPNs 

Railcar Unloading 

Track Hopper 

F-OGL28 Vent E-OGLSTHV 

Limestone 

 Storage Shed 

F-OGLT29 thru 35 Vents (3) E-OGLSSV1 

E-OGLSSV2 

E-OGLSSV3 

Limestone Storage 

Reclaim Belts 

F-OGLSPRV Vent E-OGLSPR 

Limestone 

Preparation 

Building 

F-OGLT36 Vents (3) 

(Fabric Filter) 

E-OGLSSB1V 

E-OGLSSB2V 

E-OGLSSB3V 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 4 

 8. If any condition of this permit is more stringent than the regulations identified in 

Special Conditions No. 3 through 7, then for the purposes of complying with this permit, the 

permit shall govern and be the standard by which compliance shall be demonstrated. 

FUEL SPECIFICATIONS, OPERATING LIMITATIONS, PERFORMANCE STANDARDS, AND 

CONSTRUCTION SPECIFICATIONS

 9. Fuel fired in the PC Boilers, EPNs E-OGU1 and E-OGU2, shall be limited to: 

A. Texas lignite with: 

(1) Sulfur content not to exceed a 12-month rolling average of 2.0 pound per million 

British thermal units (lb/MMBtu) of heat input and with the heat input based on fuel 

higher heating value (HHV); and 

(2) trace metal concentrations not to exceed, on a 12-month rolling average basis, the 

concentration limitations identified in Attachment A of this permit. 

B. Pipeline quality natural gas. (12/08)

C. Use of any other fuel will require prior approval from the permitting authority. 

D. Upon request by the Executive Director of the Texas Commission on Environmental 

Quality (TCEQ) or any air pollution control program having jurisdiction, the holder of 

this permit shall provide a sample and/or an analysis of the fuel fired in the PC Boiler, or 

shall allow air pollution control agency representatives to obtain a sample for analysis. 

10. Each PC Boiler, EPNs E-OGU1 and E-OGU2, shall be limited to a maximum heat input of 

8,970 MMBtu/hr, averaged over a calendar month, based on the HHV of the fuel fired. 

11. Opacity of emissions from EPNs E-OGU1 and E-OGU2 must not exceed 10 percent, 

averaged over a six-minute period, except for those periods described in 

Title 30 Texas Administrative Code § 111.111(a) (1)(E) [30 TAC § 111.111(a)(1)(E)], 40 CFR 

Part 60, § 60.11(c), or as otherwise allowed by law. 

12. Emissions from the PC Boilers, EPNs E-OGU1 and E-OGU2, shall not exceed the performance 

standards in the following tables. The performance standards of the tables shall apply at all 

times except during periods of start-up and shutdown as identified in the permit application. 

(12/08)
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 5 

A. Standards demonstrated by Continuous Emissions Monitoring Systems (CEMS) 

Pollutant1

Performance Standard 

(lb/MMBtu)2

Compliance Averaging 

Period

NOx 0.080 30-day rolling 

SO2 0.192 30-day rolling 

CO 0.34 12-month rolling 

Hg 0.0000092 12-month rolling 

PM/PM10

(fronthalf catch) 

0.015 3-hour 

not lb/MMBtu:

NH3 10 ppm hourly 

NH3 4 ppm 12-month rolling 

B. Standards demonstrated by Reference Method3

 (RM) testing 

Pollutant1

Performance Standard 

(lb/MMBtu)2

Compliance Demonstration 

Period

PM/PM10 total 0.0404

 annual 

VOC 0.0045 annual 

H2SO4 0.0122 annual 

HCl 0.0061 annual 

HF 0.0036 annual 

Notes: 

1

 NOx - nitrogen oxides PM - particulate matter H2SO4 - sulfuric acid mist 

SO2 - sulfur dioxide PM10 - PM 10μm in diameter HCl - hydrogen chloride 

CO - carbon monoxide NH3 - ammonia HF - hydrogen fluoride 

Hg - mercury VOC - volatile organic compounds 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 6 

2

 lb/MMBtu - pounds of emissions per million Btu of heat input. Heat input is based on fuel 

HHV. 

ppm - parts per million by volume, dry, adjusted to 6 percent oxygen (O2). 

3

 RM - EPA Reference Methods, based on the average of three stack sampling runs to be 

conducted as prescribed by Special Conditions No. 32 and 39. 

4

 Total PM/PM10 including back-half (condensibles) catch of sampling train. 

13. A. In the event that a CEMS for NOx is not operating for a period longer than one hour, the 

permit holder shall operate at no less than the ammonia feed rate to the selective catalytic 

reduction (SCR) system that was established during a successful initial performance test 

(adjusted for load) or at the feed rates that were measured prior to the loss of the CEMS 

(adjusted for load), whichever feed rates are higher. 

B. In the event that a CEMS for SO2 is not operating for a period longer than one hour, the 

permit holder shall operate at no less than the reagent feed rate to the flue gas 

desulfurization system that was established during a successful initial performance test 

(adjusted for load) or at the feed rates that were measured prior to the loss of the CEMS 

(adjusted for load), whichever feed rates are higher. 

14. The holder of this permit shall operate the PC boilers and associated air pollution control 

equipment in accordance with good air pollution control practice to minimize emissions during 

SSM, by operating in accordance with a written SSM plan. The plan shall include detailed 

procedures for review of relevant operating parameters of the PC boiler and associated air 

pollution control equipment during SSM to make adjustments and corrections to reduce or 

eliminate any excess emissions. The plan shall also address readily foreseeable start-up 

scenarios, including hot start-ups, when the operation of the boiler is only temporarily 

interrupted, and provide for appropriate review of the operational condition of the boiler before 

initiating start-up. In addition, the plan shall address procedures for minimizing opacity and 

PM emissions while conducting on-line maintenance of the PC boiler or its emission control 

equipment. 

15. The PC Boiler stacks, EPNs E-OGU1 and E-OGU2, will be approximately 450 feet tall with an 

exit diameter of 34.1 feet. Stack sampling ports and platform(s) shall be constructed on the 

stack as specified in the attachment entitled “Chapter 2, Stack Sampling Facilities,” or an 

alternate design may be required at a later date if determined necessary by the appropriate 

TCEQ Regional Director or the Manager of the TCEQ Austin Enforcement Division, 

Compliance Support Team. Adequate advance notice shall be provided by TCEQ if an 

alternate design is required. 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 7 

16. The auxiliary boilers, with combined stacks identified as EPN F-OGAB, shall meet the 

following specifications: 

A. Emissions of NOx shall not exceed 0.10 lb/MMBtu, averaged over 3 hours of operation. 

B. Opacity of emissions shall not exceed 10 percent. 

C. Fuel shall be limited to No. 2 fuel oil. 

D. Operation of each boiler shall be limited to a maximum of 10 percent annual capacity 

factor. Capacity factor is the ratio between the actual heat input from all fuels during a 

period of 12 consecutive calendar months and the potential heat input from all fuels had 

the boiler been operated for 8,760 hours during that 12-month period at the maximum 

design heat input capacity. 

17. The 1,444 hp emergency diesel fuel-fired electric generator, identified as EPN E-OGEG, shall 

meet the following specifications: 

A. (1) The engine shall be certified by the manufacturer to comply with the corresponding 

EPA Tier 2 emission specifications for nonroad diesel engines rated more than 

560 kW, promulgated in 40 CFR 89, Control of Emissions from New and In-use 

Nonroad Compression-Ignition Engines. 

(2) Condition A.(1) does not apply if at the time of purchase of the engine, the total 

installed cost of the Tier 2 compliant engine is more than 5 percent higher than the 

total installed cost of a corresponding Tier 1 compliant engine. In such case, the 

engine shall be certified by the manufacturer to comply with the corresponding 

EPA Tier 1 emission specifications for nonroad engines rated more than 560 kW, 

promulgated in 40 CFR 89, control of Emissions from New and In-Use Nonroad 

Compression-Ignition Engines. The holder of this permit shall not circumvent the 

intent of this provision by purchasing the engine at a date earlier than needed to assure 

timely site installation. 

B. Fuel shall be limited to diesel engine fuel containing no more than 500 ppm by weight 

sulfur. Purchased diesel engine fuel shall comply with the EPA standards for nonroad 

diesel fuel in 40 CFR 80, Regulation of Fuels and Fuel Additives, in effect at the time of 

purchase. 

C. Operation shall be limited to a maximum of 876 hours per year. 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 8 

18. The 450 hp emergency diesel fuel-fired fire water pump, identified as EPN OG-FP, shall meet 

the following specifications: 

A. (1) The engine shall be certified by the manufacturer to comply with the corresponding 

EPA emission specifications for nonroad diesel engines in the size range between 

225 kW and 600 kW, promulgated in 40 CFR 89, Control of Emissions from New and 

In-use Nonroad Compression-Ignition Engines, in effect at the time of purchase. The 

holder of this permit shall not circumvent the intent of this provision by purchasing 

the engine at a date earlier than needed to assure timely site installation. 

(2) If there are no Underwriters Laboratories (UL) listed fire pumps that meet the nonroad 

engine emission specifications in effect at the time of purchase, then the engine shall 

be certified by the manufacturer to comply with the highest Tier EPA nonroad 

emission specification for which the engine is UL listed (or no Tier specification, if no 

UL listed fire pump meets such a specification). 

(3) Conditions A.(1) and A.(2) shall not apply if the emission specification requirement is 

shown to result in greater than 5% increase in total installed cost. 

B. Fuel shall be limited to diesel engine fuel containing no more than 500 ppm by weight 

sulfur. Purchased diesel engine fuel shall comply with the EPA standards for nonroad 

diesel fuel in 40 CFR 80, Regulation of Fuels and Fuel Additives, in effect at the time of 

purchase. 

C. Operation shall be limited to a maximum of 500 hours per year unless a greater number of 

hours of operation is required to fight a fire. 

CHEMICAL AND FUEL STORAGE

19. Anhydrous ammonia storage is subject to the following requirements. 

A. Maximum on-site storage is limited to the two pressure tanks identified in the permit 

application, each with maximum volume of 30,000 gallons. 

B. The tanks shall be located within 

(1) a physical barrier to vehicular traffic; and 

(2) a containment system which is capable of holding the entire volume of material 

stored. 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 9 

C. Piping and unloading points shall be protected from impact by falling objects. 

D. Each tank vent valve shall be equipped with an alarm which will notify personnel that the 

relief valve has opened. 

E. Tanks shall be vapor balanced to the transport vessel during all tank filling operations. 

The vapor return line shall be purged back to either the transport vessel or the storage tank 

after every tank loading operation and prior to disconnection of the line. Interlocks shall 

be installed so that the unloading pump will not run unless the vapor return line to the 

transport vessel is connected. 

F. All plant personnel assigned to anhydrous ammonia injection operations shall participate 

in continuing training in safety guidelines for the handling of anhydrous ammonia, to be 

conducted no less frequently than once every two years: new and transferred personnel 

shall complete all initial training required for their specific assignments prior to 

assumption of their new duties. 

G. Overhead activity involving the lifting of heavy equipment above the anhydrous ammonia 

storage area shall not be permitted. 

H. The holder of this permit shall maintain a complete emergency response plan at the plant 

site that describes the course of action to be taken by personnel in the event of an 

anhydrous ammonia tank or line rupture, or a severe anhydrous ammonia leak. This plan 

shall include water-mitigation methods, notification of the proper civil authorities, and 

any potentially affected residences and any other appropriate organizations. This plan 

shall be made available upon request to representatives of the TCEQ or any local program 

having jurisdiction. 

20. Audio, olfactory, and visual checks for ammonia leaks shall be made once per shift within the 

operating area. 

A. No later than one hour following detection of a leak, plant personnel shall take the 

following actions: 

(1) Locate and isolate the leak. 

(2) Stop the leak by bypassing the leaking equipment or taking equipment out of service. 

B. If the leaking equipment cannot be repaired or replaced within 6 hours, use clamping 

procedures to prevent the leak until replacement or repair can be performed. 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 10 

21. In any consecutive 12-month period, the holder of this permit shall not receive more than the 

following quantities of diesel fuel: 

Tank Number 12-month throughput 

(Gallons) 

E-OGFOST 3,620,000 

E-OGEGDST 49,972 

E-OGFPDST 49,972 

MATERIAL HANDLING OPERATING LIMITATIONS AND STANDARDS

22. Annual coal received at the Oak Grove site shall not exceed 11.82 million tons per calendar 

year. Coal shall be delivered at the rail car unloading building which shall be partially enclosed 

as described in the application. 

23. If spontaneous combustion occurs in a coal stockpile, plant personnel will begin efforts as soon 

as possible to extinguish or eliminate the fire, except when extinguishing the fire may unduly 

jeopardize the safety of plant personnel and equipment, or may cause the fire to spread, in 

which case the stockpile fire may be permitted to burn itself out. 

24. A watering truck and/or the coal yard watering system shall be used to minimize dust emissions 

from the active coal storage pile area as necessary. Surface crusting agents or like chemicals 

shall be used to minimize dust emissions from the inactive coal storage pile area. 

25. Plant roads shall be paved with a cohesive hard surface which can be cleaned by sweeping or 

washing; or sprinkled with water and/or surface crusting agents as necessary to maintain 

compliance with all TCEQ rules and regulations. 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 11 

26. Material open storage area footprints shall be limited as follows: 

Source EPN Area, acres (sq.ft) 

Lignite Stackout Pile E-OGLSPF 0.32 (13,940 ft2

) 

Lignite Dead Storage Pile E-OGLDSPF 7.70 (335,410 ft2

) 

Local landfill area - 

 active working face* 

E-OGLDLF 0.80 (34,850 ft2) 

Local landfill area - 

 inactive exposed surfaces* 

E-OGLDLF 5.00 (217,800 ft2) 

Remote landfill area - 

 active working face* 

E-OGRDLF 0.80 (34,850 ft2

) 

Remote landfill area - 

inactive exposed surfaces* 

E-OGRDLF 5.00 (217,800 ft2) 

*footprint is not limited to a specific location 

27. All conveyors shall be covered, enclosed, partially covered, or partially enclosed, as represented 

in the application, to minimize fugitive particulate matter (PM) emissions. If visibility 

problems occur, additional controls may be required. Coverings and enclosures are considered 

abatement equipment, and should be kept in good repair. 

28. Fugitive emissions from the transfer points on belt conveyors, any material handling, and the 

stockpile activities shall not create an off-property nuisance condition. A trained observer with 

delegation from the Executive Director of the TCEQ may determine compliance with this 

special condition by 40 CFR Part 60, Appendix A, RM 22, or equivalent. Continuous 

demonstration of compliance with this special condition is not required. If this condition is 

violated, additional controls or process changes may be required to limit visible PM emissions. 

29. As determined by a certified opacity observer with delegation from the Executive Director of 

the TCEQ and according to 40 CFR 60, Appendix A, RM 9, or equivalent, opacity of emissions 

from any single fabric filter baghouse stack listed in Special Condition No. 30 shall not exceed 

5 percent averaged over a six-minute period. Continuous demonstration of compliance with 

this special condition is not required. 

30. Material handling baghouses or bin vent filters, designed to meet an emission limit of 0.01 grain 

PM per dry standard cubic foot of exhaust, properly installed and in good working order, shall 

control PM emissions from the following sources: 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 12 

Lignite transfer tower Bin vent E-OGSBTTV 

Lignite tripper houses: 

 PC Boiler 1, south side 

 PC Boiler 1, north side 

 PC Boiler 2, south side 

 PC Boiler 2, north side 

Baghouse 

Baghouse 

Baghouse 

Baghouse 

E-OGU1SSV 

E-OGU1NSV 

E-OGU2SSV 

E-OGU2NSV 

Limestone preparation 

building 

Bin vent 

Bin vent 

Bin vent 

E-OGLSSB1V 

E-OGLSSB2V 

E-OGLSSB3V 

Fly ash filter separators: 

 Unit 1 

 Unit 2 

Baghouse 

Baghouse 

Baghouse 

Baghouse 

Baghouse 

Baghouse 

E-OGVS1V1 

E-OGVS1V2 

E-OGVS1V3 

E-OGVS2V1 

E-OGVS2V2 

E-OGVS2V3 

Fly ash Silo 1 

Fly ash Silo 2 

Bin vent 

Bin vent 

Bin vent 

Bin vent 

Bin vent 

Bin vent 

E-OGFAS1V1 

E-OGFAS1V2 

E-OGFAS1V3 

E-OGFAS2V1 

E-OGFAS2V2 

E-OGFAS2V3 

Fly ash Silo 1 loading spout Baghouse E-OGSLS1V 

Fly ash Silo 2 loading spout Baghouse E-OGSLS2V 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 13 

INITIAL DEMONSTRATION OF COMPLIANCE

31. The holder of this permit shall perform initial stack sampling and other testing to establish the 

actual quantities of air contaminants being emitted into the atmosphere. Unless otherwise 

specified in this Special Condition No. 31, the sampling and testing shall be conducted in 

accordance with the methods and procedures specified in Special Condition No. 32. The holder 

of this permit is responsible for providing sampling and testing facilities and conducting the 

sampling and testing operations at his expense. The TCEQ Executive Director or his 

designated representative shall be afforded the opportunity to observe all such sampling. 

A. For EPNs E-OGU1 and E-OGU2: 

(1) Demonstrate compliance with the performance standards of 

Special Condition No. 12B and the hourly emission rates of the MAERT, applicable 

to normal operations, using the average of three one-hour stack sampling test runs for 

each contaminant. 

(2) Air contaminants to be sampled and analyzed under (1) above include: nitrogen 

oxides (NOx), sulfur dioxide (SO2), CO, VOC, H2SO4, HCl, HF, PM, PM10, NH3, and 

Hg. Diluents to be measured include O2 or carbon dioxide (CO2). 

(3) Demonstrate compliance with the performance standards of Special Condition No. 11 

applicable to normal operations, using the average of 30 six-minute readings as 

provided in 40 CFR 60.11(b). 

(4) Demonstrate compliance with 40 CFR 60, Subparts A and Da, for NOx, SO2, PM, and 

opacity. 

(5) Demonstrate compliance with the lb/MMBtu performance standards listed on 

Attachment A and the lb/hr emission rate for lead listed on the MAERT using the 

average of three stack sampling test runs. 

(6) Boiler load during testing shall be maintained at maximum firing rates for the 

atmospheric conditions occurring during the test as measured by millions of pounds of 

steam generated per hour or MW of electric generator output. If the steam generating 

unit is unable to operate at maximum rates during testing, then additional stack testing 

may be required when higher production rates are achieved. This requirement applies 

to hourly average emission testing and does not apply to 30-day average emission 

testing. 

B. For the auxiliary boilers, EPN E-OGAB: 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 14 

(1) Demonstrate compliance with the NOx performance standard of 

Special Conditions No. 4B, No. 16 and the hourly NOx and CO emission rates of the 

MAERT, using the average of three one-hour stack sampling test runs for each 

contaminant. 

(2) Demonstrate compliance with the opacity limitation of 40 CFR 60 Subpart Db and 

Special Condition No. 16. 

(3) Demonstrate compliance with the SO2 emission rate of the MAERT through fuel 

sulfur sampling and presumed 100 percent conversion of the fuel sulfur and emission 

as SO2. 

(4) Demonstrate compliance with the PM/PM10 and VOC emission rates of the MAERT 

through operation of the auxiliary boiler within its design limitations. 

C. (1) For the coal handling facilities with stack emissions, identified in Special Condition 7, 

demonstrate compliance with the opacity limits of this permit and 40 CFR 60, 

Subpart Y. 

(2) For the coal handling facilities with fugitive emissions, EPNs E-OGLSPF and 

E-OGLDSPF, demonstrate compliance with the opacity limits of 40 CFR 60, 

Subpart Y using 40 CFR Part 60, Appendix A, Reference Method 22. 

D. For the limestone handling facilities with stack emissions, identified in 

Special Condition 8, demonstrate compliance with the opacity limits of this permit and 

40 CFR 60, Subpart OOO. 

E. For at least one material handling baghouse, to be selected by the Waco Regional Director 

of the TCEQ, or his designated representative, sample PM emissions using RM 5 testing 

to show compliance with the emission limit of Special Condition No. 30. 

F. For the emergency generator and fire-water pump, EPNs E-OGEG and E-OGFP, 

demonstrate compliance with the emission rates of the MAERT by showing compliance 

with the requirements of Special Condition No. 17 and 18, respectively. 

G. For the cooling tower, EPN E-OGCT1, demonstrate compliance with the emission rates of 

the MAERT by records that demonstrate that the drift eliminators are designed to limit 

drift as specified in the application, and by inspection of modules, selected by the 

TCEQ Regional Director or his designated representative, for: consistency with the 

specified design; flow bypassing the drift eliminators; and damage to the eliminators. 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 15 

H. Requests to waive testing for any pollutant specified in this condition shall be submitted 

to the TCEQ Office of Permitting, Remediation, and Registration, Air Permits Division. 

Test waivers and alternate or equivalent procedure proposals for New Source 

Performance Standards testing which must have EPA approval shall be submitted to the 

TCEQ Austin Compliance Support Division. 

I. For each PC Boiler, sampling as required by this condition shall occur within 60 days 

after the particular boiler achieves the maximum fuel firing rate at which it will be 

operated, but no later than 180 days after initial start-up. The first boiler operating day of 

30-day average initial performance testing required by 40 CFR 60.46a(f) must commence 

within this time. 

TEST METHODS AND PROCEDURES

32. A. Sampling shall be conducted in accordance with the appropriate procedures of the TCEQ 

Sampling Procedures Manual, EPA Methods in 40 CFR Part 60, Appendix A and 40 CFR 

Part 51, Appendix M, EPA Conditional Test Methods, and American Society for Testing 

and Materials (ASTM) as follows: 

(1) Appendix A, Methods 1 through 4, as appropriate, for exhaust flow, diluent, and 

moisture concentration; 

(2) Appendix A, Method 5B or 17, modified to include back-half condensibles, for the 

concentration of PM; 

(3) Appendix A, Method 5B or 17, for the filterable concentration of PM 

(front-half catch); 

(4) Appendix A, Method 6, 6a, 6c, or 8, for the concentration of SO2; 

(5) Appendix A, Method 7E for the concentrations of NOx and O2, or equivalent methods; 

(6) Appendix A, Method 8 or a modified Method 8 for H2SO4; 

(7) Appendix A, Method 9 for opacity; 

(8) Appendix A, Method 10 for the concentration of CO; 

(9) Appendix A, Method 19, for applicable calculation methods; 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 16 

 (10) Appendix A, Method 22, for visual determination of fugitive emissions from material 

sources; 

 (11) Appendix A, Method 25A, modified to exclude methane and ethane, for the 

concentration of VOC (to measure total carbon as propane); 

 (12) Appendix A, Method 26 or 26A for HCl and HF; 

 (13) EPA Conditional Test Method 27 (CTM-027), for NH3; 

 (14) Appendix A, Method 29 for the metals listed in Attachment A; 

 (15) Appendix M, Methods 201A and 202, or Appendix A, Reference Method 5, modified 

to include back-half condensibles, for the concentration of particulate matter less than 

10 microns in diameter, PM10; 

 (16) Appendix M, Methods 201A or Appendix A, Reference Method 5, for the filterable 

concentration of particulate matter less than 10 microns in diameter, PM10 (front-half 

catch); 

 (17) ASTM D6784-02, Standard Test Method for Elemental, Oxidized, Particle-Bound, 

and Total Mercury in Flue Gas Generated from Coal-Fired Stationary Sources (also 

known as the Ontario Hydro Method), or other approved EPA methods. 

 (18) Any variations from those procedures must be approved by the Executive Director of 

the TCEQ or his designated representative prior to sampling. 

B. The TCEQ Waco Regional Office shall be given notice as soon as testing is scheduled but 

not less than 30 days prior to sampling to schedule a pretest meeting. 

(1) The notice shall include: 

(a) Date for pretest meeting. 

(b) Date sampling will occur. 

(c) Name of firm conducting sampling. 

(d) Type of sampling equipment to be used. 

(e) Method or procedure to be used in sampling. 

(f) Projected date of commencement of the 30-day rolling average initial 

performance tests for SO2 and NOx, in accordance with 40 CFR 60.46a(f). 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 17 

(2) The purpose of the pretest meeting is to review the necessary sampling and testing 

procedures, to provide the proper data forms for recording pertinent data, and to 

review the format procedures for submitting the test reports. The permit holder shall 

present at the pretest meeting the manner in which stack sampling will be executed in 

order to demonstrate compliance with emission standards found in this permit and 

40 CFR Part 60, Subparts Da, Db, Y, and OOO. 

(3) Prior to the pretest meeting, a written proposed description of any deviation from 

sampling procedures specified in permit conditions or TCEQ, EPA or 

ASTM sampling procedures shall be made available to the TCEQ. The 

TCEQ Regional Director or the TCEQ Austin Compliance Support Division shall 

approve or disapprove of any deviation from specified sampling procedures. 

C. Information in the test report shall include the following data for each test run: 

(1) hourly coal firing rate (in tons); 

(2) average coal Btu/lb as-received and dry weight; 

(3) average steam generation rate in millions of pounds per hour; 

(4) average generator output in MW; 

(5) daily sulfur content and heat content of the fuel measured in accordance with 

EPA RM 19 to show compliance with 40 CFR 60, Subpart Da; 

(6) control device operating rates, including SCR reagent injection and limestone 

injection rates; and 

(7) emissions in the units of the limits of this permit, lb/hr and lb/MMBtu, three-hour or 

30-day average, as appropriate. 

(8) any additional records deemed necessary during the stack sampling pre-test meeting. 

D. Two copies of the final sampling report shall be forwarded to the TCEQ within 60 days 

after sampling is completed. Sampling reports shall comply with the attached conditions 

of Chapter 14 of the TCEQ Sampling Procedures Manual. The reports shall be distributed 

as follows: 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 18 

One copy to the TCEQ Waco Regional Office. 

One copy to the TCEQ Austin Office of Permitting, Remediation, and Registration, Air 

Permits Division. 

CONTINUOUS DEMONSTRATION OF COMPLIANCE

33. The holder of this permit shall install, calibrate, maintain, and operate continuous emission 

monitoring systems (CEMS) to measure and record the concentrations of NOx, CO, and SO2 

from EPNs E-OGU1 and E-OGU2. Diluents to be measured include O2 or CO2. The 

CEMS data shall be used to determine continuous compliance with the NOx, CO, and SO2

emission limitations in Special Condition No. 3 (NOx and SO2), Special Condition No. 12A, 

and the attached MAERT. Except as provided by Special Condition No. 49, continuous 

compliance with the performance standards of Special Condition No. 12A shall commence on 

the first boiler operating day of the 30-day initial performance testing required by 

NSPS Subpart Da. 

A. The CEMS shall meet the design and performance specifications, pass the field tests, and 

meet the installation requirements and the data analysis and reporting requirements 

specified in the applicable Performance Specification Nos. 1 through 9, 40 CFR Part 60, 

Appendix B or an acceptable alternative. If there are no applicable performance 

specifications in 40 CFR Part 60, Appendix B, contact the TCEQ Office of Permitting, 

Remediation, and Registration, Air Permits Division in Austin for requirements to be met. 

 

B. The holder of this permit shall assure that the CEMS meets the applicable quality 

assurance requirements specified in 40 CFR Part 60, Appendix F, Procedure 1, or an 

acceptable alternative. Relative accuracy exceedances, as specified in 40 CFR Part 60, 

Appendix F, § 5.2.3 and any CEMS downtime and all cylinder gas audit exceedances of 

±15 percent accuracy shall be reported semiannually to the appropriate TCEQ Regional 

Director, and necessary corrective action shall be taken. Supplemental stack 

concentration measurements may be required at the discretion of the appropriate 

TCEQ Regional Director. 

C. The monitoring data shall be reduced to hourly average concentrations at least once every 

day, using normally a minimum of four equally-spaced data points from each one-hour 

period. The individual average concentrations shall be reduced to units of the permit 

allowable emission rate in pounds per hour at least once every day. Pound per hour data 

shall be summed on a monthly basis to tons per year and used to determine compliance 

with the annual emissions limits of this permit. If the CEMS malfunctions, then the 

recorded concentrations may be reduced to units of the permit allowable as soon as 

practicable after the CEMS resumes normal operation. 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 19 

D. The appropriate TCEQ Regional Office shall be notified at least 30 days prior to any 

required relative accuracy test audits in order to provide them the opportunity to observe 

the testing. 

E. If applicable, each CEMS will be required to meet the design and performance 

specifications, pass the field tests, and meet the installation requirements and data analysis 

and reporting requirements specified in the applicable performance specifications in 

40 CFR Part 75, Appendix A and B, as an acceptable alternative to paragraph A. of this 

condition. 

F. Each CEMS shall be operational during 95 percent of the operating hours of the 

PC Boiler, exclusive of the time required for zero and span checks. If this operational 

criteria is not met for the reporting quarter, the holder of this permit shall develop and 

implement a monitor quality improvement plan. The plan should address the downtime 

issues to improve availability and reliability. The plan should provide additional 

assurance of compliance including record keeping of reagent flow rates for monitor 

downtime periods. 

34. The holder of this permit shall install, calibrate, certify, operate, and maintain CEMS to 

measure and record the filterable PM/PM10 emissions from EPNs E-OGU1 and E-OGU2. The 

CEMS data shall be used to determine continuous compliance with the filterable (front-half) 

PM emission limitations in Special Condition No. 12A and the attached MAERT. After the 

initial determination of compliance, the CEMS shall be used to determine continuous 

compliance with the opacity limitations in Special Conditions No. 3 and 11. Compliance with 

the PM mass emission limit will be considered to demonstrate compliance with the opacity 

limit; however, the TCEQ may use EPA Reference Method 9 to determine opacity at any time. 

A. The PM CEMS shall meet the Federal NSPS requirements specified in 40 CFR 

§§ 60.13, 60.48Da(p), 60.48Da(v), and 40 CFR Part 60, Appendix B, Performance 

Specification 11 (PS-11). In order to demonstrate compliance with PS-11, the PM CEMS 

shall meet the manufacturer’s design and performance specifications, and undergo 

performance evaluation testing as outlined in 40 CFR 60, § 60.13. The 

TCEQ Regional Director shall be notified 30 days prior to the certification. 

B. A Quality Assurance Plan (QAP) shall be prepared in accordance with 40 CFR Part 60, 

Appendix F, Procedure 2 and adhered to following the initial certification of compliance. 

The QAP shall be maintained to reflect changes to component technology. If requested 

by the TCEQ Regional Director, the holder of this permit must submit documentation 

demonstrating compliance with these requirements. 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 20 

C. The PM data shall be reduced to hourly averages in accordance with 40 CFR § 60.13(h) 

and PS-11, Section 6.5. The data shall be recorded in units of lb/MMBtu and lb/hr at least 

daily. Pounds per hour data shall be summed on a monthly basis to TPY and used to 

determine compliance with the annual emission limits of this permit. 

D. The TCEQ Waco Regional Office shall be notified at least 30 days prior to any required 

relative response audit or response correlation audit. 

E. Recertification, if required, shall be based on the requirements of 40 CFR Part 60, 

Appendix B, PS-11 in effect at the time of initial certification, or as approved by the 

TCEQ Regional Director. (12/08)

35. The holder of this permit shall install, calibrate, operate, and maintain CEMS to measure and 

record the concentration of NH3 from EPNs E-OGU1 and E-OGU2. The NH3 concentrations 

shall be corrected and reported in accordance with Special Condition No. 12A. The CEMS data 

shall be used to determine continuous compliance with the NH3 performance specifications in 

Special Condition No. 12A and the MAERT. Any other method used for measuring NH3 slip 

shall require prior approval from the TCEQ Waco Regional Office, with consultation between 

the Regional Office and the TCEQ Austin Air Permits Division. 

36. The holder of this permit shall install, calibrate, operate, and maintain CEMS or sorbent trap 

monitoring system to measure and record the concentration of mercury from EPNs E-OGU1 

and E-OGU2, as prescribed by 40 CFR Parts 60 and 75. The CEMS or sorbent trap data shall 

be used to demonstrate continuous compliance with the emission limitations 

of Special Condition No. 12A and the MAERT. 

37. If any emission monitor fails to meet specified performance, it shall be repaired or replaced as 

soon as reasonably possible. 

38. After the initial demonstration of compliance, on-going compliance with the non-mercury metal 

performance standards identified in Attachment A of this permit, the emission rates for lead in 

the MAERT, and the sulfur content of Special Condition No. 9 will be demonstrated by testing 

of the as-fired coal at least once per calendar quarter for compliance with the non-mercury 

metal coal concentration limits in Attachment A. The HHV of the coal sample shall also be 

measured. 

39. After the initial demonstration of compliance, on-going stack sampling of EPNs E-OGU1 and 

E-OGU2 for H2SO4, HCl, HF, VOC, total PM/PM10, or coal concentration testing, shall be used 

to demonstrate continuous compliance and shall meet the following specifications: 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 21 

A. Stack sampling shall be performed once annually during periods of normal operation, 

except as follows: 

(1) If the annual test does not establish compliance with a performance standard of 

Special Condition No. 12B, the holder of this permit may conduct additional tests 

during the year to be averaged with the previous test(s) to demonstrate compliance; or 

(2) if, after two years of stack sampling, the average of the two annual stack sampling 

results for a pollutant is less than 70 percent of the applicable performance standard 

identified in Special Condition No. 12B, then compliance stack sampling for such 

pollutant may be conducted once every three years. 

B. Sampling required in (A.) of this Special Condition shall demonstrate compliance with the 

performance standards of Special Condition No. 12B and the lb/hr emission limits of the 

MAERT applicable to normal operations. 

C. Sampling required in (A.) of this Special Condition shall be conducted in accordance with 

the methods, procedures, and notification protocol specified in Special Condition No. 32. 

D. Ongoing compliance with the H2SO4, HF, HCl, VOC, and PM/PM10 tons per year 

emission rates in the MAERT shall be demonstrated by calculating rolling 12-month 

annual emissions from emission factors (lb/MMBtu, HHV) obtained from the sampling 

required in (A.) of this condition and the monthly total heat input (MMBtu, HHV) from 

coal. 

40. Compliance with the following emission rates in the MAERT, applicable to periods of start-up 

and shutdown, will be demonstrated as follows: 

A. Compliance with the lead and PM and PM10 (filterable and total) emission rates in the 

MAERT applicable during start-up and shutdown will be demonstrated if the recorded 

pressure drop across the baghouse meet manufacturer guidelines for proper operation 

during start-up and shutdown. 

B. Compliance with the VOC emission rate in the MAERT applicable during start-up and 

shutdown will be demonstrated if the CO emissions during start-up and shutdown are in 

compliance with the CO emission rate in the MAERT for start-up and shutdown. 

C. Compliance with the H2SO4, HF, and HCl emission rates in the MAERT for start-up and 

shutdown will be demonstrated if the SO2 emissions during start-up and shutdown are in 

compliance with the SO2 emission rate in the MAERT for start-up and shutdown. 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 22 

41. Following the initial demonstration of compliance, ongoing compliance with the emission 

limits for the sources and emission limitations listed in this condition shall be through source 

operation in accordance with manufacturer’s specifications, or in accordance with written 

procedures that are shown to maintain operating conditions necessary for emission compliance. 

The Executive Director of the TCEQ or his designated representative may also require direct 

measurement of emissions using the sampling methods and procedures specified in 

Special Condition No. 32 to establish compliance with the limitations, in which case the 

sampled emission rate will be used to determine compliance. 

A. The auxiliary boilers, EPN E-OGAB, emission limitations of Special Condition No. 16A 

and 16B, and the MAERT. 

B. The emergency diesel engines, EPNs E-OGEG and E-OGFP, emission limitations in the 

MAERT. 

42. Following the initial demonstration of compliance, ongoing compliance with the emission rates 

in the MAERT for the cooling tower, EPN E-OGCT1, will be based on annual inspection of 

modules, and repair as necessary to maintain drift eliminator structural integrity and minimize 

bypassing of flow around drift eliminators. 

43. Following the initial demonstration of compliance, ongoing compliance with the emission rates 

in the MAERT for the coal, limestone and flyash material handling baghouses and bin vents 

will be demonstrated by annual opacity testing using RM 9 for EPNs identified in 

Special Conditions No. 6 and 7, and RM 22 for EPNs E-OGLSPF, E-OGLDSPF, E-OGLDL, 

and E-OGRDL. The Executive Director of the TCEQ or his designated representative may also 

require sampling conducted in accordance with the methods and procedures specified in 

Special Condition No. 32 to directly measure the lb/hr emission rate, in which case the sampled 

lb/hr emission rate will be used to determine compliance with the applicable emission rate in 

the MAERT. 

44. Compliance with the emission rates in the MAERT for the fuel storage tanks, 

EPNs E-OGFOSTV, E-OGEGDST, and E-OGFPDST, will be demonstrated by compliance 

with Special Condition No. 21. 

RECORDKEEPING REQUIREMENTS

45. The following records shall be kept at the plant for the life of the permit. All records required 

in this permit shall be made available at the request of personnel from the TCEQ, the EPA, or 

any air pollution control agency with jurisdiction. 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 23 

A. A copy of this permit. 

B. Permit application dated July 27, 2005, and subsequent representations submitted to the 

TCEQ. 

C. A complete copy of the testing reports and records of the initial air emissions performance 

testing completed pursuant to the Initial Demonstration of Compliance. 

46. The following records shall be kept for a minimum of five years after collection and shall be 

made immediately available upon request to representatives of the TCEQ, the EPA, or any local 

air pollution control program having jurisdiction. Records shall be legible and maintained in an 

orderly manner. The following records shall be maintained: 

A. Continuous emission monitoring data for SO2, NOx, CO, PM/PM10 and diluent gases, 

O2 or CO2, from CEMS to demonstrate compliance with the emission rates listed in the 

MAERT and performance standards listed in this permit for pollutants that are monitored 

by CEMS. Data retention at intervals less than one hour is not required. Records should 

identify the times when emissions data have been excluded from the calculation of 

average emission rates because of start-up, shutdown, maintenance, and malfunction 

along with the justification for excluding data. Records should also identify factors used 

in calculations that are used to demonstrate compliance with emissions limits and 

performance standards. (12/08)

B. Files of all CEMS quality assurance measures, calibration checks, adjustments and 

maintenance performed on these systems. (12/08)

C. Steam turbine generator hourly gross electrical output in MW, including identification of 

shutdown intervals, for compliance with output based performance specifications of this 

permit. 

D. Written coal analysis for all coal received from each coal supplier to show compliance 

with the sulfur and trace metal concentration limits of this permit, and written analysis 

provided by fuel oil and diesel fuel suppliers to show compliance with the sulfur content 

limitations of this permit. 

E. Average coal feed rate to the PC Boiler in pounds per hour and the corresponding average 

heat input (HHV) in MMBtu/hr, based upon an average over each calendar month. 

F. Ammonia feed rate and sorbent feed rate established during a successful initial 

performance test to fulfill the requirements of Special Condition No. 13. 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 24 

G. Hours of operation of the emergency generator, emergency fire water pump, and auxiliary 

boilers to show compliance with the hourly operating limitations of this permit. 

H. Tons of coal received at the site monthly to show compliance with the throughput 

requirements of this permit. 

I. The amount of fuel received for storage in EPNs E-OGFOSTV, E-OGEGDST, and 

E-OGFPDST and the consecutive 12-month total of fuel received for each source to show 

compliance with the throughput requirements of this permit. 

J. Records of cleaning and maintenance performed on abatement equipment, including 

records of replacement maintenance performed on baghouses and conveyors. A log 

should be kept with descriptions of the activity performed and the time period over which 

it was performed. 

K. Records required to show compliance with 40 CFR part 60, Subparts Da, Db, Kb, Y, and 

OOO, including records of required reporting. 

L. Records of daily road maintenance for dust control to show compliance with 

Special Condition No. 25. 

M. Records of audio, olfactory, and visual checks for ammonia leaks and repairs to show 

compliance with Special Condition No. 20. 

N. Records of all venting of the anhydrous ammonia storage tanks to show compliance with 

Special Condition No. 19. 

O. Required stack sampling results or other air emissions testing (other than CEMS data) that 

may be conducted on units authorized under this permit after the initial demonstration of 

compliance testing of this permit. (12/08)

REPORTING

47. The holder of this permit shall submit to the TCEQ Waco Regional Office quarterly reports as 

described in 40 CFR § 60.7. Such reports are required for each emission unit which is required 

to be continuously monitored pursuant to this permit. 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 25 

AS-BUILT INFORMATION

48. The holder of this permit shall submit to the TCEQ Waco Regional Office and the TCEQ Air 

Permits Division change pages to the permit application reflective of the final plans and 

engineering specifications on the PC Boilers, auxiliary boilers, emergency engines, and other 

sources, including their respective control equipment, no later than 30 days before initial 

start-up of the PC Boilers. This information shall include: 

A. All TCEQ Tables in the permit application, updated with manufacturer and other 

specified data. 

B. Revised plot plans and equipment drawings as required to reflect the constructed facility. 

C. Manufacturer’s certification of emissions for the diesel engines and if applicable, cost 

information to verify compliance with the emission Tier requirements of this permit. 

D. Identification of any maximum inputs of raw materials for the as-built facility, and any 

diesel fuel sulfur or engine manufacturer’s emission specification that is lower than the 

values represented in the permit application and used for calculating or establishing 

emissions. Accompanying this information shall be a request for permit alteration. The 

TCEQ shall alter the permit special conditions and MAERT to reflect any such reduction 

in emissions. Increases in allowable emission rates require a permit amendment before 

construction begins. 

MITIGATION STUDIES - NOx, MERCURY AND AMMONIA

49. For each PC boiler, if the permit holder is unable to demonstrate compliance with the PC Boiler 

performance standards identified in Special Condition No. 12A for the control of NOx, NH3 or 

Hg within 180 days of initial start-up, then the permit holder may request additional time for an 

emissions study to mitigate emissions from the unit. Mitigation studies may be requested by 

the permit holder to evaluate and implement additional efforts to mitigate the emissions of 

NOx, NH3, or Hg. Exceedances of an NOx, NH3, or Hg emission limit that occur before or 

during an approved mitigation study are not a violation of the emission limit or performance 

standard set forth for those contaminants in this permit as long as the owner or operator 

maintains and operates the equipment and control equipment at all times in a manner consistent 

with good practice for minimizing emissions. The following conditions shall be met for the 

studies: 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 26 

A. Prior to the initiation of mitigation studies, a protocol shall be developed and approved by 

the Executive Director of the TCEQ. The protocol shall include at a minimum a proposed 

duration of the study period and an explanation of control efforts that will be evaluated. 

Additionally, the protocol will include a description of the specific testing that will be 

used to evaluate emissions during the mitigation study. All stack testing done for this 

study shall be coordinated with the TCEQ Waco Regional Office. 

B. A report summarizing the results of the mitigation study shall be submitted to the TCEQ 

Air Permits Division and TCEQ Waco Regional Office within forty-five (45) days after 

the completion of the individual mitigation study. This report shall include a summary of 

the effort utilized to mitigate emissions and the resulting emission rates measured during 

the study, as well as a listing of actions that will be undertaken by the permit holder to 

achieve the performance standard listed in Special Condition No. 12. 

C. All mitigation studies shall be completed within 12 months of the initial demonstration of 

compliance stack testing. 

NOx OPTIMIZATION

50. During the two years of operation following the initial demonstration of compliance testing of 

the first PC boiler placed into operation, the permit holder will conduct a study of the 

operational capability of the SCR system at emission levels below 0.08 lb NOx/MMBtu to 

determine the lower sustainable emission rate average over a thirty day averaging period. 

Factors to be considered in the study include: the demonstrated NOx removal efficiency of the 

catalyst at the end of the scheduled catalyst cycle of replacement; the ability of the SCR system 

to operate at lower levels without adverse effect on the electric generating unit capacity, 

reliability, and availability; and other engineering, operational or environmental factors such as 

ammonia or CO emissions, or detached plumes. Within forty-five days after the end of the twoyear operational period, the permit holder shall submit a written report of the results of the 

study and a request to alter the permit to lower the 0.08 lb NOx/MMBtu limit of 

Special Condition 12A if the study demonstrates that a lower rate is justified based on 

SCR performance with typical and expected maintenance and operational effects. 

 Dated December 9, 2008 
SPECIAL CONDITIONS 

Permit Numbers 76474 and PSD-TX-1056 

Page 27 

Attachment A 

Non-mercury Metal Concentrations in Coal and Emission Performance Standards

Constituent Annual Average Coal 

Concentration (ppmw)

Emission 

 Performance Standard 

(lb/MMBtu)

Beryllium 2.0 0.000011

Lead 6.4 0.000029

Arsenic 4.7 0.000027

Cadmium 0.20 0.0000017

Vanadium 37 0.00018

Nickel 9.9 0.000052

Silver 0.20 0.00000066

Barium 213 0.0010

Chromium 18 0.000049

Copper 32 0.000039

Manganese 169 0.0011

Antimony 1.1 0.0000043

Selenium 7.6 0.000029

Zinc 18 0.00016

Boron 252 0.00054