NOTE: Draft determinations are marked with a " * " beside the RBLC ID.

Required fields are denoted by "+".

Report Date: 05/05/2010            Control Technology Determinations (Freeform)
Facility Information: WELLTON MOHAWK GENERATING STATION

RBLC ID: AZ-0047

+ Corporate/Company Name: DOME VALLEY ENERGY PARTNERS

+Facility Name: WELLTON MOHAWK GENERATING STATION Facility County: YUMA Facility State: AZ Facility ZIP Code: 85356 Facility Country: USA Facility Contact Name: BRUCE WERTZ Facility Contact Phone: 8032178868 Facility Contact Email: BWERTZ@SCANA.COM EPA Region: 9 Agency Code: AZ001 Agency Name: ARIZONA DEPT OF ENV QUAL, OFC OF AIR QUA Agency Contact: TREVOR BAGGIORE Agency Phone: (602) 771-2321 Agency Email: TB4@AZDEQ.GOV Other Agency Contact Info: TREVOR BAGGIORE (602) 771-2321 TB4@AZDEQ.GOV

+Permit Number: 1001653

+ SIC Code: 4911 NAICS Code: 221120 Facility Registry System Number: 110014463856 Application Accepted Received Date: 04/16/2001 ACT Permit Issuance Date: 12/01/2004 ACT Date determination entered in RBLC: 07/08/2005 Date determination last updated: 01/31/2006 Permit Type: A: New/Greenfield Facility Permit URL: Facility Description: COMBINED CYCLE GAS-FIRED ELECTRICITY GENERATING STATION Permit Notes: Previous PageAffected Boundaries: WELLTON MOHAWK GENERATING STATION

+Boundary (Class 1 Area or US Border Name): US/Mexico Border Boundary Type (Class 1 or Intl Border): INTL BORDER Distance: < 100 km Class 1 Area State:

Facility-wide Emissions: WELLTON MOHAWK GENERATING STATION

+Pollutant Name: Carbon Monoxide Facility-wide Emissions Increase: 781.0000 (Tons/Year)

+Pollutant Name: Nitrogen Oxides (NOx) Facility-wide Emissions Increase: 344.6000 (Tons/Year)

+Pollutant Name: Particulate Matter (PM) Facility-wide Emissions Increase: 303.4000 (Tons/Year)

+Pollutant Name: Sulfur Oxides (SOx) Facility-wide Emissions Increase: 46.8000 (Tons/Year)

+Pollutant Name: Volatile Organic Compounds (VOC) Facility-wide Emissions Increase: 259.9000 (Tons/Year)

Process Information: WELLTON MOHAWK GENERATING STATION

+Process Name: COMBUSTION TURBINE GENERATORS AND HEAT RECOVERY STEAM GENERATORS - GE7FA TURBINES OPTION

+Process Type: 15.210 Primary Fuel: NATURAL GAS Throughput: 170.00 Throughput Unit: MW Process Notes: THIS IS ONE OF TWO OPERATING SCENARIOS THAT ARE WRITTEN INTO THE FACILITY'S PERMIT. THE COMPANY CAN CHOOSE BETWEEN GE TURBINES OR SIEMENS WESTINGHOUSE TURBINES. THE THROUGHPUT OF THE HEAT RECOVERY STEAM GENERATORS IS 346 MMBTU/HR (WITH SUPPLEMENTAL FIRING)Pollutant Information: WELLTON MOHAWK GENERATING STATION - COMBUSTION TURBINE GENERATORS AND HEAT RECOVERY STEAM GENERATORS - GE7FA TURBINES OPTION

+Pollutant Name Nitrogen Oxides (NOx) Pollutant Group(s): ( InOrganic Compounds , Oxides of Nitrogen (NOx) , Particulate Matter (PM) )

+ CAS Number: 10102 Test Method: Unspecified

+ Control Method Code: A

+ Control Method Description: LOW NOX BURNERS AND SELECTIVE CATALYTIC REDUCTION Emission Limit 1: 2.0000 Emission Limit 1 Unit: PPM AT 15% O2 Emission Limit 1 Avg. Time/Condition: THREE-HOUR Emission Limit 2: 16.0000 Emission Limit 2 Unit: LB/H Emission Limit 2 Avg. Time/Condition: Standard Emission Limit: 2.0000 Standard Emission Limit Unit: PPM AT 15% O2 Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: NSPS Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: 9,478 ($/ton) Incremental Cost Effectiveness: 6,225 ($/ton) Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance AFTER 18 MONTHS, THE 2.0 PPM LIMITS CHANGES TO APollutants/Compliance Notes: AFTER 18 MONTHS, THE 2.0 PPM LIMITS CHANGES TO A 1-HOUR AVERAGE UNLESS THE DIRECTOR AND ADMINISTRATOR DETERMINE THE LIMIT IS UNABLE TO BE MET, BASED UPON A DEMONSTRATION BY THE COMPANY. THE FACILITY ALSO HAS A STARTUP/SHUTDOWN LIMIT FOR THE GE7FA TURBINES - EMISSIONS OF NOX FROM EACH UNIT MAY NOT EXCEED 166.7 LB/HR AVERAGED OVER THE PERIOD OF EACH STARTUP OR SHUTDOWN EVENT.

+Pollutant Name Carbon Monoxide Pollutant Group(s): ( InOrganic Compounds )

+ CAS Number: 630-08-0 Test Method: Unspecified

+ Control Method Code: A

+ Control Method Description: OXIDATION CATALYST Emission Limit 1: 3.0000 Emission Limit 1 Unit: PPM @ 15% O2 Emission Limit 1 Avg. Time/Condition: 3-HOUR AVERAGE Emission Limit 2: 0 Emission Limit 2 Unit: Emission Limit 2 Avg. Time/Condition: Standard Emission Limit: 3.0000 Standard Emission Limit Unit: PPM @ 15% O2 Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: 5,695 ($/ton) Incremental Cost Effectiveness: 5,695 ($/ton) Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:+Pollutant Name Particulate matter, filterable < 10 μ (FPM10) Pollutant Group(s): ( Particulate Matter (PM) )

+ CAS Number: PM Test Method: Unspecified

+ Control Method Code: N

+ Control Method Description: Emission Limit 1: 29.8000 Emission Limit 1 Unit: LB/H Emission Limit 1 Avg. Time/Condition: 3-HOUR AVERAGE Emission Limit 2: 0 Emission Limit 2 Unit: Emission Limit 2 Avg. Time/Condition: Standard Emission Limit: 0 Standard Emission Limit Unit: Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: NSPS Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness: Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

+Pollutant Name Sulfur Dioxide (SO2) Pollutant Group(s): ( InOrganic Compounds , Oxides of Sulfur (SOx) )

+ CAS Number: 7446-09-5 Test Method: Unspecified

+ Control Method Code: N

+ Control Method Description: Emission Limit 1: 0.0023 Emission Limit 1 Unit: LB/MMBTUEmission Limit 1 Avg. Time/Condition: 3-HOUR AVERAGE Emission Limit 2: 4.7000 Emission Limit 2 Unit: LB/H Emission Limit 2 Avg. Time/Condition: 3-HOUR AVERAGE Standard Emission Limit: 0 Standard Emission Limit Unit: Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: NSPS Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness: Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

+Pollutant Name Volatile Organic Compounds (VOC) Pollutant Group(s): ( Volatile Organic Compounds (VOC) )

+ CAS Number: VOC Test Method: Unspecified

+ Control Method Code: A

+ Control Method Description: OXIDATION CATALYST Emission Limit 1: 3.0000 Emission Limit 1 Unit: PPM @ 15% O2 Emission Limit 1 Avg. Time/Condition: 3-HOUR AVERAGE Emission Limit 2: 8.4000 Emission Limit 2 Unit: LB/H Emission Limit 2 Avg. Time/Condition: 3-HOUR AVERAGE Standard Emission Limit: 0 Standard EmissionStandard Emission Limit Unit: Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness: Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

+Pollutant Name Visible Emissions (VE) Pollutant Group(s):

+ CAS Number: VE Test Method: Unspecified

+ Control Method Code: N

+ Control Method Description: Emission Limit 1: 10.0000 Emission Limit 1 Unit: % OPACITY Emission Limit 1 Avg. Time/Condition: 6-MINUTE AVERAGE Emission Limit 2: 0 Emission Limit 2 Unit: Emission Limit 2 Avg. Time/Condition: Standard Emission Limit: 10.0000 Standard Emission Limit Unit: % OPACITY Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: NSPS Did factors, other thenDid factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness: Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

Process Information: WELLTON MOHAWK GENERATING STATION

+Process Name: COMBUSTION TURBINE GENERATORS AND HEAT RECOVERY STEAM GENERATORS - SW501F TURBINES OPTION

+Process Type: 15.210 Primary Fuel: NATURAL GAS Throughput: 180.00 Throughput Unit: MW Process Notes: THIS IS ONE OF TWO OPERATING SCENARIOS THAT ARE WRITTEN INTO THE FACILITY'S PERMIT. THE COMPANY CAN CHOOSE BETWEEN GE TURBINES OR SIEMENS WESTINGHOUSE TURBINES. THE THROUGHPUT OF THE HEAT RECOVERY STEAM GENERATORS IS 383 MMBTU/HR (WITH SUPPLEMENTAL FIRING)

Pollutant Information: WELLTON MOHAWK GENERATING STATION - COMBUSTION TURBINE GENERATORS AND HEAT RECOVERY STEAM GENERATORS - SW501F TURBINES OPTION

+Pollutant Name Nitrogen Oxides (NOx) Pollutant Group(s): ( InOrganic Compounds , Oxides of Nitrogen (NOx) , Particulate Matter (PM) )

+ CAS Number: 10102 Test Method: Unspecified

+ Control Method Code: A

+ Control Method Description: LOW NOX BURNERS AND SELECTIVE CATALYTIC REDUCTION Emission Limit 1: 2.0000 Emission Limit 1 Unit: PPM @ 15% O2 Emission Limit 1 Avg. Time/Condition: 3-HOUR AVERAGE Emission Limit 2: 18.3000Emission Limit 2 Unit: LB/H Emission Limit 2 Avg. Time/Condition: 3-HOUR AVERAGE Standard Emission Limit: 2.0000 Standard Emission Limit Unit: PPM @ 15% O2 Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: NSPS Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: 2,675 ($/ton) Incremental Cost Effectiveness: 5,093 ($/ton) Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes: AFTER 18 MONTHS, THE 2.0 PPM LIMITS CHANGES TO A 1-HOUR AVERAGE UNLESS THE DIRECTOR AND ADMINISTRATOR DETERMINE THE LIMIT IS UNABLE TO BE MET, BASED UPON A DEMONSTRATION BY THE COMPANY. THE FACILITY ALSO HAS A STARTUP/SHUTDOWN LIMIT FOR THE SW501F TURBINES - EMISSIONS OF NOX FROM EACH UNIT MAY NOT EXCEED 166.7 LB/HR AVERAGED OVER THE PERIOD OF EACH STARTUP OR SHUTDOWN EVENT.

+Pollutant Name Carbon Monoxide Pollutant Group(s): ( InOrganic Compounds )

+ CAS Number: 630-08-0 Test Method: Unspecified

+ Control Method Code: A

+ Control Method Description: OXIDATION CATALYST Emission Limit 1: 3.0000 Emission Limit 1 Unit: PPM @ 15% O2 Emission Limit 1 Avg. Time/Condition: 3-HOUR AVERAGE Emission Limit 2: 16.7000 Emission Limit 2 Unit: LB/H Emission Limit 2 Avg. Time/Condition: 3-HOUR AVERAGEStandard Emission Limit: 3.0000 Standard Emission Limit Unit: PPM @ 15% O2 Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: 1,988 ($/ton) Incremental Cost Effectiveness: 1,988 ($/ton) Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

+Pollutant Name Particulate matter, filterable < 10 μ (FPM10) Pollutant Group(s): ( Particulate Matter (PM) )

+ CAS Number: PM Test Method: Unspecified

+ Control Method Code: N

+ Control Method Description: Emission Limit 1: 33.1000 Emission Limit 1 Unit: LB/H Emission Limit 1 Avg. Time/Condition: 3-HOUR AVERAGE Emission Limit 2: 0 Emission Limit 2 Unit: Emission Limit 2 Avg. Time/Condition: Standard Emission Limit: 0 Standard Emission Limit Unit: Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: NSPSDid factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness: Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

+Pollutant Name Sulfur Dioxide (SO2) Pollutant Group(s): ( InOrganic Compounds , Oxides of Sulfur (SOx) )

+ CAS Number: 7446-09-5 Test Method: Unspecified

+ Control Method Code: N

+ Control Method Description: Emission Limit 1: 0.0023 Emission Limit 1 Unit: LB/MMBTU Emission Limit 1 Avg. Time/Condition: 3-HOUR AVERAGE Emission Limit 2: 5.3000 Emission Limit 2 Unit: LB/H Emission Limit 2 Avg. Time/Condition: 3-HOUR AVERAGE Standard Emission Limit: 0 Standard Emission Limit Unit: Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: NSPS Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness:Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

+Pollutant Name Volatile Organic Compounds (VOC) Pollutant Group(s): ( Volatile Organic Compounds (VOC) )

+ CAS Number: VOC Test Method: Unspecified

+ Control Method Code: A

+ Control Method Description: OXIDATION CATALYST Emission Limit 1: 3.0000 Emission Limit 1 Unit: PPM @ 15% O2 Emission Limit 1 Avg. Time/Condition: 3-HOUR AVERAGE Emission Limit 2: 9.5000 Emission Limit 2 Unit: LB/H Emission Limit 2 Avg. Time/Condition: 3-HOUR AVERAGE Standard Emission Limit: 0 Standard Emission Limit Unit: Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness: Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

+Pollutant Name Visible Emissions (VE) Pollutant Group(s):

+ CAS Number: VETest Method: Unspecified

+ Control Method Code: N

+ Control Method Description: Emission Limit 1: 10.0000 Emission Limit 1 Unit: % OPACITY Emission Limit 1 Avg. Time/Condition: 6-MINUTE AVERAGE Emission Limit 2: 0 Emission Limit 2 Unit: Emission Limit 2 Avg. Time/Condition: Standard Emission Limit: 10.0000 Standard Emission Limit Unit: % OPACITY Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: NSPS Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness: Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

Process Information: WELLTON MOHAWK GENERATING STATION

+Process Name: MECHANICAL DRAFT COOLING TOWERS

+Process Type: 99.009 Primary Fuel: Throughput: 170000.00 Throughput Unit: Gal/Min Process Notes: 6-CELL COOLING TOWERPollutant Information: WELLTON MOHAWK GENERATING STATION - MECHANICAL DRAFT COOLING TOWERS

+Pollutant Name Particulate matter, filterable < 10 μ (FPM10) Pollutant Group(s): ( Particulate Matter (PM) )

+ CAS Number: PM Test Method: Unspecified

+ Control Method Code: P

+ Control Method Description: DRIFT ELIMINATORS (NOT TO EXCEED A TOTAL DRIFT RATE OF 0.0005 PERCENT OF CIRCULATING WATER FLOW) Emission Limit 1: 3.0000 Emission Limit 1 Unit: LB/H Emission Limit 1 Avg. Time/Condition: Emission Limit 2: 0 Emission Limit 2 Unit: Emission Limit 2 Avg. Time/Condition: Standard Emission Limit: 0 Standard Emission Limit Unit: Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness: Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

+Pollutant Name Visible Emissions (VE) Pollutant Group(s):

+ CAS Number: VE Test Method: Unspecified

+ Control Method Code: P+ Control Method Description: DRIFT ELIMINATORS (NOT TO EXCEED A TOTAL DRIFT RATE OF 0.0005 PERCENT OF CIRCULATING WATER FLOW) Emission Limit 1: 5.0000 Emission Limit 1 Unit: % OPACITY Emission Limit 1 Avg. Time/Condition: 6-MINUTE AVERAGE Emission Limit 2: 0 Emission Limit 2 Unit: Emission Limit 2 Avg. Time/Condition: Standard Emission Limit: 5.0000 Standard Emission Limit Unit: % OPACITY Standard Limit Avg. Time/Condition: 6-MINUTE AVERAGE

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness: Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

Process Information: WELLTON MOHAWK GENERATING STATION

+Process Name: AUXILIARY BOILER

+Process Type: 13.310 Primary Fuel: NATURAL GAS Throughput: 38.00 Throughput Unit: MMBTU/H Process Notes:

Pollutant Information: WELLTON MOHAWK GENERATING STATION - AUXILIARY BOILER

+Pollutant Name Nitrogen Oxides (NOx)Pollutant Group(s): ( InOrganic Compounds , Oxides of Nitrogen (NOx) , Particulate Matter (PM) )

+ CAS Number: 10102 Test Method: Unspecified

+ Control Method Code: A

+ Control Method Description: LOW NOX BURNERS Emission Limit 1: 0.3700 Emission Limit 1 Unit: LB/MMBTU Emission Limit 1 Avg. Time/Condition: BASED ON HIGHER HEATING VALUE OF FUEL Emission Limit 2: 0 Emission Limit 2 Unit: Emission Limit 2 Avg. Time/Condition: Standard Emission Limit: 0.3700 Standard Emission Limit Unit: LB/MMBTU Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness: Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

+Pollutant Name Carbon Monoxide Pollutant Group(s): ( InOrganic Compounds )

+ CAS Number: 630-08-0 Test Method: Unspecified

+ Control Method Code: N

+ Control Method Description: Emission Limit 1: 0.0800 Emission Limit 1 Unit: LB/MMBTUEmission Limit 1 Avg. Time/Condition: BASED ON HIGHER HEATING VALUE OF FUEL Emission Limit 2: 0 Emission Limit 2 Unit: Emission Limit 2 Avg. Time/Condition: Standard Emission Limit: 0.0800 Standard Emission Limit Unit: LB/MMBTU Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness: Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

+Pollutant Name Particulate matter, filterable < 10 μ (FPM10) Pollutant Group(s): ( Particulate Matter (PM) )

+ CAS Number: PM Test Method: Unspecified

+ Control Method Code: N

+ Control Method Description: Emission Limit 1: 0.0033 Emission Limit 1 Unit: LB/MMBTU Emission Limit 1 Avg. Time/Condition: BASED ON HIGHER HEATING VALUE OF FUEL Emission Limit 2: 0 Emission Limit 2 Unit: Emission Limit 2 Avg. Time/Condition: Standard Emission Limit: 0.0033 Standard EmissionStandard Emission Limit Unit: LB/MMBTU Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: NSPS Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness: Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

+Pollutant Name Visible Emissions (VE) Pollutant Group(s):

+ CAS Number: VE Test Method: Unspecified

+ Control Method Code: N

+ Control Method Description: Emission Limit 1: 10.0000 Emission Limit 1 Unit: % OPACITY Emission Limit 1 Avg. Time/Condition: 6-MINUTE AVERAGE Emission Limit 2: 0 Emission Limit 2 Unit: Emission Limit 2 Avg. Time/Condition: Standard Emission Limit: 10.0000 Standard Emission Limit Unit: % OPACITY Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: NSPS Did factors, other thenDid factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness: Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

+Pollutant Name Volatile Organic Compounds (VOC) Pollutant Group(s): ( Volatile Organic Compounds (VOC) )

+ CAS Number: VOC Test Method: Unspecified

+ Control Method Code: N

+ Control Method Description: Emission Limit 1: 0.0033 Emission Limit 1 Unit: LB/MMBTU Emission Limit 1 Avg. Time/Condition: BASED ON HIGHER HEATING VALUE OF FUEL Emission Limit 2: 0 Emission Limit 2 Unit: Emission Limit 2 Avg. Time/Condition: Standard Emission Limit: 0 Standard Emission Limit Unit: Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness:Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

+Pollutant Name Sulfur Dioxide (SO2) Pollutant Group(s): ( InOrganic Compounds , Oxides of Sulfur (SOx) )

+ CAS Number: 7446-09-5 Test Method: Unspecified

+ Control Method Code: N

+ Control Method Description: Emission Limit 1: 0.0023 Emission Limit 1 Unit: LB/MMBTU Emission Limit 1 Avg. Time/Condition: BASED ON HIGHER HEATING VALUE OF FUEL Emission Limit 2: 0 Emission Limit 2 Unit: Emission Limit 2 Avg. Time/Condition: Standard Emission Limit: 0.0023 Standard Emission Limit Unit: LB/MMBTU Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness: Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

Process Information: WELLTON MOHAWK GENERATING STATION+Process Name: BLACK START GENERATORS

+Process Type: 17.130 Primary Fuel: NATURAL GAS Throughput: 6.00 Throughput Unit: MW Process Notes:

Pollutant Information: WELLTON MOHAWK GENERATING STATION - BLACK START GENERATORS

+Pollutant Name Nitrogen Oxides (NOx) Pollutant Group(s): ( InOrganic Compounds , Oxides of Nitrogen (NOx) , Particulate Matter (PM) )

+ CAS Number: 10102 Test Method: Unspecified

+ Control Method Code: N

+ Control Method Description: Emission Limit 1: 1.5000 Emission Limit 1 Unit: G/B-HP-H Emission Limit 1 Avg. Time/Condition: AT 100% LOAD Emission Limit 2: 0 Emission Limit 2 Unit: Emission Limit 2 Avg. Time/Condition: Standard Emission Limit: 1.5000 Standard Emission Limit Unit: G/B-HP-H Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness: Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005Pollutants/Compliance Notes:

+Pollutant Name Carbon Monoxide Pollutant Group(s): ( InOrganic Compounds )

+ CAS Number: 630-08-0 Test Method: Unspecified

+ Control Method Code: N

+ Control Method Description: Emission Limit 1: 2.3000 Emission Limit 1 Unit: G/B-HP-H Emission Limit 1 Avg. Time/Condition: AT 100% LOAD Emission Limit 2: 0 Emission Limit 2 Unit: Emission Limit 2 Avg. Time/Condition: Standard Emission Limit: 2.3000 Standard Emission Limit Unit: G/B-HP-H Standard Limit Avg. Time/Condition:

+ Case-by-Case Basis: BACT-PSD Other Applicable Requirements: Did factors, other then air pollution technology considerations influence the BACT decisions?: U

+Percent Efficiency: Compliance Verified: Unknown Cost Effectiveness: Incremental Cost Effectiveness: Cost Verified (Y/N)?: No Dollar Year Used In Cost Estimates: 2005 Pollutants/Compliance Notes:

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