COMPLIANCE STATEMENT Tucson Electric Power Company H. Wilson Sundt Irvington Generating Station Unit#4 Operating Permit February 8,1993. ADHS permit Number 0375-96, Emission Standards areas

follows: Sulfur Dioxide @ 1.0 lb/MMBtu Nitrogen Oxides @ 0.7 lb/million Btu Particulates @ E=1.02Q 07 Where: E=the maximum allowable emissions ratein pounds-mass per hourQ=theheat inputin million Btuper hour Measured Emissions (06/8-9/1 1)were: Low Load Nitrogen Oxides @ 0.499 lb/MMBtu Sulfur Dioxide @‘ 0.732 lb/MMBtu High Load Particulates @E= Q= 1,279.7 million Btu/hour Therefore Allowable =250.0 PPH Measured =28.49 PPH TEP Irvington Unit #4 CEMS, Cmp. 6—8,9—11RELATIVE ACCURACY SUMMARY Tucson Electric Power Company H. Wilson Sundt lrvington Generating Station -Unit#4 Tucson, Arizona Results:Source Species RAA Result BAF

6/08/11Unit#4 -Mid Load Stack Gas Flow (wscth) 3.2% 1.001 6/09/11Unit#4 -High Load Stack Gas Flow (wscfh) 1.5% 1.000 6/09/11Unit#4 -Low Load NO,(

-ppm v/vd 4.3% 1.029 NO

- lb/MMBtu 5.5% 1.036 SO2 -ppm v/vd 2.3% 1.017 SO2- lb/MMBtu 2.6% 1.023 -%v/vd 0.O6Abs 1.005 CO2 -%v/vd 0.22Abs 1.031 Stack Gas Flow (wscth) 3.5% 1.020 TEPlrvington Unit #4CEMS, Cmp. 6—8,9--li 9Tucson Electric Power Irvington Generating Station Air Quality Permit #1052 PART B: SPECIFIC CONDiTIONS All standards are Federally Enforceable unless otherwise noted [References aretoTitle17ofthe Pirna County Code unless otherwise noted] APPLICABILITY Equipment covered bythis permit constitutes a Major Source based on 8760 hours of operation per year and considering emissions from other emission units ofthe same SIC Code atthis facility. Equipment specifically addressed bythe permit is listed in Attachment D, Equipment List and falls under the

following Categories: A. Fossil Fuel Fired Steam Generators B. Stationary Rotating Machinery (including Stationary Turbines IGTI, IGT2& future AOS for IGT3) C. Auxiliary Boiler D. Cooling Towers E. Coal Preparation Plant F Fly-Ash Handling Systems G. Open Areas, Roadways, & Streets H All Operations Affected Emission Source Classification: Class1; Major Stationary Source (SOx, NOx, CO, VOC, PM10 & HAPs). II. EMISSION LIMITS & STANDARDS [PCC 712 180A2] A. Fossil Fuel Fired Steam Generators I. Particulate Matter Standard {PCC 171660CI] [Locally Enforceable Condition] The Permittee shall not cause. allow, or permit the emission of particulate matter from any fossil fuel-fired steam generator in excess ofthe amounts calculated bythe folloing equation: E=I.02Q° where: E=the maximum alloable particulate emissions ratein pounds-mass per hour. Q =the heat inputin million Btuper hour. 2. Sulfur Dioxide Standard occII6 1) [Locally Enforceable Condition] 16 1( TEP Irvington Unit #4 CEMS, Cmp. 6—8,9--lia. UNITSII.l2.&l3The Permittee shall not cause, allow, or permit the emission of more than 1,0 pound of sulfur dioxide asathree hour average per million Btu heat input when firing liquid fuel. b. UNIT 14 The Permittee shall not cause, allow, or permit the emission of more than 1.0 pound of sulfur dioxide asa three-hour average, per million Btu heat input. [Installation Permit 56. Condition 5] 3. Nitrogen Oxides Standard -UNIT 14 The Permittee shall not cause, allow, or permit the emission of more than 0.7 pounds of nitrogen oxides asathree hour average (calculated as nitrogen dioxide) per million I3TU heat input. [Instaflation PermitS 156. Condition 5] 4. Opacity Standard
-UNIT 14 The Permittee shall not cause, allow, or permit tobe emitted intothe atmosphere any plume or effluent from the boiler which exceeds 20 percent opacity, as measured in accordance with EPA Reference Method 9. [Installation Permit l56. Conditions] 5. Fuel Limitations a. The Permittee shall notuse high sulfur oil (fuel sulfur content> 0.90% by weight) asa fuel unless the Permittee demonstrates tothe satisfaction ofthe Control Officer that sufficient quantities oflow sulfur oilarenot available forusebythe source and thatithas adequate facilities and contingency plans to insure that the sulfur dioxide ambient air

quality standards set forthin 17.08.020 willnotbe violated. [PUC 7I61(1 [Locally Enforceable Condition] b. UNITSII.12.&13The Permittee shall only burn the following asfuel: ]PCC 17219111 i. Natural gas: ii. Fuel Oils#2 through 6or equivalent: iii. Co-firing Natural gas with Fuel Oils2 through 6or equialent: iv. Co-firing anyofthe fuels listed above (ll.A.5.b.i through iiofthis Part) ith Landfill Gas. c. UNIT 14 i. The Permittee shall only burn the following asfuel: {PC 1712li (A) Coal: (B) Natural Gas: 17 1’EP Irvington Unit #4 CEMS, Cmp. 6—8,9—11CEM RELATIVE ACCURACY DETERMINATION Client: Location:Source: Statistical Data:
-184,738.7 3,515,844,072,030.35 Mean: 16,376,106.4 16,396,632.9 -20,526.52 IMeani: 20,526.52 N (number ofdata points) = t.975 (t-value) = Sd (Standard Deviation) = CC (Confidence Coefficient) = Relative Accuracy (RA): BAF Test (mean difference <CC) RAE (Bias Adjustment Factor) Remarks:

92.306662,575.66 509,299.82 3.2 %RM Pass1.001 I.RA<10%or0.5pct jR-Al for Certification, 40CER75 Applicability 2.Bias pass/fail 3.BAF =1+ ABS(Mean)/CEM avg

Gas Flow -wscfh Tucson Electric Power Date: 06/08/11 Irvington Generating Station Unit#4 -Mid Load Run# Reference Reference CEM Difference (Diff.)A2 Run Time Method Average wsdfli wscth 1 -GF/1-H20 09:41-09:49 16,717,045.1 16,312,278.3 404,766.8 163,836,162,382.24 2-GF/1-H20 09:56-10:01 16,849,905.8 16,407,842.4 442,063.4 195,420,049,619.56 3-GF/1-H20 10:11-10:17 16,919,659.1 16,357,399.4 562,259.7 316,135,970,244.09 4-GF/1-H20 10:26-10:30 16,575,093.3 16,438,617.3 136,476.0 18,625,698,576.00 5-GF!2-H20 10:59-1 1:05 16,944,495.2 16,337,962.8 606,532.4 367,881,552,249.76 6-GF/2-H20 11:10-11:16 16,661,929.2 16,349,069.5 312,859.7 97,881,191,884.09 7-GF/2-H20 11:24-11:30 15,480,518.3 16,454,583.2 -974,064.9 948,802,429,412.01 8-GF/2-H20 11:44-11:50 15,626,700.4 16,423.345.6 -796,645.2 634,643,574,683.04 9-GF/2-H20 11:55-12:01 15,609,611.1 16,488,597.7 -878,986.6 772,617,442,979.56 Sum: 1: TEP Irvngtor Unit #4 CEMS, Cmp. 6—8,9—11-4 m -v D (c -F ____________________________________________ 0 D Summary of Gas Stream Characteristics Client: Tucson Electric Power

Date: 06/08/11 Location: lrvington Generating Station Source: Unit #4- Mid Load cD

EPA Method #1-4 Gas Stream Characeristics Run # GF Time 1120 Time AWCFM WSCFH ADCFM DSCFH T(s) %H20 %C0 2 02% v/v v/v Dry 1-GF/1-H20 09:41-09:49 09:40-10:40 436125.3 16,717,045.1 401,933.1 15,406,428.8 285 7.84 11.88 7.89 2-GF/1-H20 09:56-10:01 09:40-10:40 439695.5 16,849,905.8 405,223.4 15,528,873.2 287 7.84 11.88 7.89 3-GF/1-H20 10:1 1-10:17 09:40-10:40 442712.7 16,919,659.1 408,004.0 15,593,157.8 288 7.84 11.88 7.89 4-GF/1-H20 10:26-10:30 09:40-10:40 434164.1 16,575,093.3 400,125.6 15,275,606.0 289 7.84 11.88 7.89 5-GF/2-H20 10:59-11:05 10:54-12:09 445981.2 16,944,495.2 412,220.4 15,661,796.9 292 7.57 11.75 7.93 6-GF/2-H20 11:10-11:16 10:54-12:09 438639.5 16,661,929.2 405,434.5 15,400,621.2 293 7.57 11.75 7.93 7-GF/2-H20 11:24-11:30 10:54-12:09 407764.3 15,480,518.3 376,896.5 14,308,643.1 293 7.57 11.75 7.93 8-GF/2-H20 11:44-11:50 10:54-12:09 412390.6 15,626,700.4 381,172.6 14,443,759.2 294 7.57 11.75 7.93 9-GF/2-H20 11:55-12:01 10:54-12:09 412088.9 15,609,611.1 380,893.8 14,427,963.5 295 7.57 11.75 7.93Summary of [ucson Electric Power lrvington Generating Station Unit 4- Low Load Gas Flow! Moisture Data 06-8,9-Il

EPA Methods #1-4 Gas Stream Characteristics Time
Run # AWCFM ADCFM SCFH

Ts

% 1120
% CO 2
% 02 1120 Gas Flow GF/H 2 0

v/v v/v d v/v d 23:37-23:57 23:39-23:45 10-GF/3-H20 335,453.9 318,144.5 13,035,874.2
277 5.16 7.3 13.2 00:16-00:46 00:19-00:25

I 1-GF/4-H20 328,916.8 311,286.9 13,045,943.3
262 5.36
7.1 13.1 00:53-01:23 00:54-01:00 12-GF/5-H20 319,865.4 303,296.4 12,838,529.1
253 5.18 7.3 13.0 0l:30-02:0() 01:31-01:37 13-GF/6-H20 304,528.4 289,667.4 12,328,040.7
247 4.88 7.4 13.0 02:06-02:36 02:14-02:20 14-GF/7-H20 303,623.2 288,047.3 12,373,225.2
243 5.13 7.4 13.1 02:42-()3:02 02:48-02:54 15-GF/8-H20 309,808.3 293,574.3 12,692,365.5
239 5.24 7.3 13.1 03:18-03:48 03:19-03:25 16-GF/9-F120 309,255.2 294,472.8 12,699,951.9
237 4.78 7.2 13.0 03:53-04:23 03:54-04:08 17-GF/10-H20 302,215.3 286,741.9 12,450,245.3
235 5.12 7. 13.0 04:28-04:58 04:29-04:35 18-GF/11-H20 307,998.1 292,598.2 12,747,727.2
232 5.00 7.4 13.0Summary of Tucson Electric Power lrvington Generating Station Unit 4- Low Load Gas Flow! Moisture Data 06-8,9-11

EPA Methods #1-4 Gas Stream Characteristics Run # AWCFM ADCFM DSCFH

Ts

% 1120
% CO 2
% 02 1120 Gas Flow GF/H 2 0

v/v v/v d v/v d 23:37-23:57 23:39-23:45 10-GF/3-H20 335,453.9 318,144.5 12,363,223.1
277 5.16 7.3 13.2 00:16-00:46 00:19-00:25

1 1-GF/4-H20 328,916.8 311,286.9 12,346,680.7 262 5.36
7.1 13.1 00:53-01:23 00:54-01:0() 12-GF/5-H20 319,865.4 303,296.4 12,173,493.3
253 5.18 7.3 13.() 01:30-02:0() 01:31-01:37 13-GF!6-H20 304,528.4 289,667.4 11,726,432.3
247 4.88 7.4 13.0 02:06-02:36 02:14-02:2() 14-GF/7-H20 303,623.2 288,047.3 11,738,478.7
243 5.13 7.4 13.1 02:42-03:02 (>2:48-02:54 15-GF/8-H20 309,808.3 293,574.3 12,027,285.5
239 5.24 7.3 13.1 03:18-03:48 03:19-03:25 16-GF/9-H20 309,255.2 294,472.8 12,092,894.2
237 4.78 7.2 13.0 03:53-04:23 03:54-04:08 17-GF/10-F{20 302,215.3 286,741.9 11,812,792.7
235 5.12 7.2 13.0 04:28-04:58 04:29-04:35 18-GF/11-H20 307,998.1 292,598.2 12,110,340.8
232 5.00 7.4 13.0Summary of [ucson Electric Power Irvington Generating Station Unit 4- Low Load Emission I)ata 06-X,9- 11

EPA Methods Time Run # #7E N0

#6C SO,

#3A ppm lb/MMBtu PPH ppm lb/MMBtu PPH 02 % CO 2 % v/v d

v/v d

v/v d v/v d 23:38-23:58

1 155.5 0.495 229.5 164.8 0.729 338.5 13.2 7.3 00:17-00:37

2 144.7 0.455 213.3 166.8 0.728 342.1 13.1 7.1 00:54-01:14

3 157.8 0.489 229.4 169.3 0.73() 342.4 13) Cmp Run

1 152.7 0.480 224.1 167.0 0.729 341.0 13.1 7.2 01:31-01:51

4 161.8 0.502 226.5 168.6 0.727 328.4 13.() 7.4 02:07-02:27

5 164.3 0.516 230.3 167.9 0.733 327.4 13.1 7.4 02:43-03:03

6 161.9 0.509 232.5 168.4 0.735 336.5 13.1 7.3 Cmp Run
2 162.7 0.509 229.8 168.3 0.732 330.8 13.1 7.4 03:19-03:39

7 164.3 0.510 237.2 171.2 0.738 343.9 13.0 7.2 03:54-04:14

8 163.5 0.507 230.6 169.7 0.732 333.0 13.0 7.2 04:29-04:49

9 163.9 0.508 237.0 170.0 0.733 342.0 13.0 7.4 Cmp Run
3 163.9 0.508 234.9 170.3 0.734 339.6 13.0 7.3 *Mean Cmp 1-3 159.8 0.499 229.6 168.5 0.732 337.1 13.1 7.3 Compliance runs calculated by combining

3 RATA runs.Summary
of Tucson Electric Power Irvington Generating Station Unit 4 - Low Load Emission l)ata 06-8,9-1

1

EPA Methods Time Run # #7E N0,,

#6C SO,
#3A ppm lb/MMBtu PPH ppm lb/MMBtu PPH 02 % CO 2 % v/v d

v/v d

v/v d v/v d 23:38-23:58

1 155.5 0.495 229.5 164.8 0.729 338.5 13.2 7.3 00:17-00:37

2 144.7 0.455 213.3 166.8 0.728 342.1 13.1 7.1 00:54-01:14

3 157.8 0.489 229.4 169.3 0.730 342.4 13.0 7.3 01:31-01:51

4 161.8 0.502 226.5 168.6 0.727 328.4 13.0 7.4 02:07-02:27

5 164.3 0.516 230.3 167.9 0.733 327.4 13.1 7.4 02:43-03:03

6 161.9 0.509 232.5 168.4 0.735 336.5 13.1 7.3 03:19-03:39

7 164.3 0.510 237.2 171.2 0.738 343.9 13.0 7.2 03:54-04:14

8 163.5 0.507 230.6 169.7 0.732 333.0 13.0 7.2 04:29-04:49

9 163.9 0.508 237.0 170.0 0.733 342.0 13.0 7.4CEM RELATIVE ACCURACY DETERMINATION NO,,

-ppm v/vdry Client: Tucson Electric Power Date: 06-8,9-11 Location: lrvington Generating Station Source: Unit4 -Low Load Run# Reference Reference CEM Difference (Duff.) A2 Run Time Method Average ppm v/vd ppm v/vd 1 23:38-23:58 155.5 143.6 11.9 141.61 2 00:17-00:37 144.7 143.6 1.1 1.21 3 00:54-01:14 157.8 153.3 4.5 20.25 4 01:31-01:51 161.8 157.5 4.3 18.49 5 02:07-02:27 164.3 160.2 4.1 16.81 6 02:43-03:03 161.9 158.4 3.5 12.25 7 03:19-03:39 164.3 159.8 4.5 20.25 8 03:54-04:14 163.5 159.7 3.8 14.44 9 04:29-04:49 163.9 160.5 3.4 11.56 Sum: 41.10 256.87 Mean: 159.74 155.18 4.57 IMeani: Statistical Data: N (number ofdata points) = 9 t.975 (t-value) = 2.306 Sd (Standard Deviation) = 2.94 CC (Confidence Coefficient) = 2.26 Relative Accuracy (RA): 4.3 %RM* BAF Test (mean difference <CC) Fail BAF (Bias Adjustment Factor) 1.029 *RemarJ: 1.RA<10% RMor±15ppm Abs for Certification, 40CFR75 Applicability 2.Bias pass/fail 3.BAF =1+ ABS(Mean)/CEM avg TEP Irvington Unit #4 CEMS, Cmp. 6—8,9—11CEM RELATIVE ACCURACY DETERMINATION NO,

- lb/MMBtu Date: 06-8,9-11 Statistical Data:
Mean: 0.4990 0.4818 0.0172 IMeani: 0.0172 N (number ofdata points) = t.975 (t-value) = Sd (Standard Deviation) = CC (Confidence Coefficient) =
92.3060.010.01 Relative Accuracy (RA): 5.5 %J,4* BAF Test (mean difference <CC) Fail BAF (Bias Adjustment Factor) 1.036 * Remarks: 1.RA 10% RMor±0.020 Ib.MMBtu Absfor Certification, 40CFR75 Applicability 2.Bias pass/fail 3.BAF =1+ ABS(Mean)/CEM avg

Client: Location:Source: Tucson Electric Power Irvington Generating Station Unit4 -Low Load Run# Reference Reference CEM Difference (Diff.)”2 Run Time Method Average lb/MMBtu lb/MMBtu 1 23:38-23:58 0.495 0.449 0.046 0.002116 2 00:17-00:37 0.455 0.448 0.007 0.000049 3 00:54-01:14 0.489 0.471 0.018 0.000324 4 01:31-01:51 0.502 0.487 0.015 0.000225 5 02:07-02:27 0.516 0.499 0.017 0.000289 6 02:43-03:03 0.509 0.492 0.017 0.000289 7 03:19-03:39 0.510 0.494 0.016 0.000256 8 03:54-04:14 0.507 0.496 0.011 0.000121 9 04:29-04:49 0.508 0.500 0.008 0.000064 Sum: 0.155 0.003733 TEP Irvington Unit #4 CEMS, Cmp. 6—8,9—1 1 isCEM RELATIVE ACCURACY DETERMINATION SO2 -ppm v/vdry Client: Tucson Electric Power Date: 06-8,9-11 Location: Irvington Generating Station Source: Unit4 -Low Load Run# Reference Reference CEM Difference (Diff.)”2 Run Time Method Average ppm v/vd ppm v/vd 1 23:38-23:58 164.8 164.0 0.8 0.64 2 00:17-00:37 166.8 164.5 2.3 5.29 3 00:54-01:14 169.3 167.7 1.6 2.56 4 01:31-01:51 168.6 166.7 1.9 3.61 5 02:07-02:27 167.9 165.3 2.6 6.76 6 02:43-03:03 168.4 165.9 2.5 6.25 7 03:19-03:39 171.2 166.8 4.4 19.36 8 03:54-04:14 169.7 165.5 4.2 17.64 9 04:29-04:49 170.0 165.0 5.0 25.00 Sum: 25.30 87.11 Mean: 168.52 165.71 2.81 IMeanI: 2.81 Statistical Data: N (number ofdata points) = 9 t.975 (t-value) = 2.306 Sd (Standard Deviation) = 1.41 CC (Confidence Coefficient) = 1.09 Relative Accuracy (RA): 2.3 %RM* BAF Test (mean difference <CC) Fail BAF (Bias Adjustment Factor) 1.017 *Remar: I.RA 10% RMor±15 ppm Absfor Certification, 40CFR75 Applicability 2.Bias pass/fail 3.BAF =1+ ABS(Mean)/CEM avg TEP lrvington Unit #4 CEMS, Cmp. 6—8,9—11 2(CEM RELATIVE ACCURACY DETERMINATION SO2 - lb/MMBtuClient: Tucson Electric Power Date: 06-8,9-11 Location: Irvington Generating Station Source: Unit4 -Low Load Run# Reference Reference CEM Difference (Diff.)”2 Run Time Method Average lb/MMBtu lb/MMBtu 1 23:38-23:58 0.729 0.712 0.017 0.000289 2 00:17-00:37 0.728 0.713 0.015 0.000225 3 00:54-01:14 0.730 0.717 0.013 0.000169 4 01:31-01:51 0.727 0.717 0.010 0.000100 5 02:07-02:27 0.733 0.716 0.017 0.000289 6 02:43-03:03 0.735 0.716 0.019 0.000361 7 03:19-03:39 0.738 0.717 0.021 0.000441 8 03:54-04:14 0.732 0.714 0.018 0.000324 9 04:29-04:49 0.733 0.715 0.018 0.000324 Sum: 0.148 0.002522 Mean: 0.7317 0.7152 0.0164 IMeani: 0.0164 Statistical Data: N (number ofdata points) = 9 t.975 (t-value) = 2.306 Sd (Standard Deviation) = 0.0033 CC (Confidence Coefficient) = 0.0025 Relative Accuracy (RA): 2.6 %RM* BAF Test (mean difference <CC) Fail BAF (Bias Adjustment Factor) 1.023 *Remar: I.RA<10% RMfor Certification, 40CFR75 Applicability 2.Bias pass/fail 3.BAF =1+ ABS(Mean)/CEM avg TEP lrvington Unit #4 CEMS, Cmp. 6—8,9—11 2’CEM RELATIVE ACCURACY DETERMINATION 02% v/vdry Client: Tucson Electric Power Date: 06-8,9-11 Location: Irvington Generating Station

Source: Unit4 -Low Load Run# Reference Reference CEM Difference (Diff.)”2 Run Time Method Average %v/vdry %v/vdry 1 23:38-23:58 13.2 13.1 0.1 0.01 2 00:17-00:37 13.1 13.0 0.1 0.01 3 00:54-01:14 13.0 12.9 0.1 0.01 4 01:31-01:51 13.0 13.0 0.0 0.00 5 02:07-02:27 13.1 13.0 0.1 0.01 6 02:43-03:03 13.1 13.0 0.1 0.01 7 03:19-03:39 13.0 13.0 0.0 0.00 8 03:54-04:14 13.0 13.0 0.0 0.00 9 04:29-04:49 13.0 13.0 0.0 0.00 Sum: 0.50 0.05 Mean: 13.06 13.00 0.06 Meanl: 0.06 Statistical Data: N (number ofdata points): 9 t.975 (t-value) = 2.306 Sd (Standard Deviation) = 0.05 CC (Confidence Coefficient) = 0.04 Relative Accuracy (RA): 0.06% Abs.* BAF Test (mean difference <CC) Fail BAF (Bias Adjustment Factor) 1.005 *Remar: 1.RA 10% RMor1%Absfor Certification, 40CFR75 Applicability 2.Bias pass/fail 3.BAF =1+ ABS(Mean)/CEM avg TEP lrvington Unit#4 (EMS, Cmp. 6—8,9—11 2CEM RELATIVE ACCURACY DETERMINATION C02% v/vdry Client: Tucson Electric Power Date: 06-8,9-11 Location: Irvington Generating Station

Source: Unit4 -Low Load Run# Reference Reference CEM Difference (Diff.)”2 Run Time Method Average %v/vdry %v/vdry 1 23:38-23:58 7.3 6.6 0.7 0.49 2 00:17-00:37 7.1 7.0 0.1 0.01 3 00:54-01:14 7.3 7.2 0.1 0.01 4 01:31-01:51 7.4 7.2 0.2 0.04 5 02:07-02:27 7.4 7.1 0.3 0.09 6 02:43-03:03 7.3 7.1 0.2 0.04 7 03:19-03:39 7.2 7.2 0.0 0.00 8 03:54-04:14 7.2 7.1 0.1 0.01 9 04:29-04:49 7.4 7.1 0.3 0.09 Sum: 2.00 0.78 Mean: 7.29 7.07 0.22 IMeani: 0.22 Statistical Data: N (number ofdata points): 9 t.975 (t-value) = 2.306

CC (Confidence Coefficient) = 0.16 Sd (Standard Deviation) = 0.20 Relative Accuracy (RA): 0.22% Abs.* BAF Test (mean difference <CC) Fail BAF (Bias Adjustment Factor) 1.031 *Remar: 1.RA<10% RMor1%Absfor Certification, 40CFR75 Applicability 2.Bias pass/fail 3.BAF =1+ ABS(Mean)/CEM avg TEP Irvington Unit #4 CEMS, Cmp. 6—8,9—11 2CEM RELATIVE ACCURACY DETERMINATION Gas Flow -wscfh Client: Tucson Electric Power Date: 06/09/11 Location: Irvington Generating Station Source: Unit4 -High Load Run# Reference Reference CEM Difference (Duff.) A2 Run Time Method Average wscfh wscth 1-OF 16:25-16:32 22,368,342.0 22.264,030.4 104,311.6 10,880,909,894.56 2-OF 16:40-16:46 22,482,234.4 22,629,911.0 -147,676.6 21,808,378,187.56 3-GF 16:56-17:02 21,938,973.0 22,593,814.1 -654,841.1 428,816,866,249.21 4-OF 17:11-17:17 22,612,782.4 22,482,747.1 130,035.3 16,909,179,246.09 5-OF 17:26-17:32 22,980,094.8 22,205,773.5 774,321.3 599,573,475,633.69 6-OF 17:42-17:48 22,324,515.5 22,498,019.0 -173,503.5 30,103,464,512.25 7-OF 17:56-18:02 22,588,733.0 22,440,402.8 148,330.2 22,001,848,232.04 8-OF 18:54-19:00 22,060,298.0 22,543,833.9 -483,535.9 233,806.966,588.81 9-OF 19:10-19:16 22,588,733.0 22,350,160.6 238,572.4 56,916,790,041.76 Sum: -63,986.3 1,420,817,878,585.97 Mean: 22,438,300.7 22,445,410.3 -7,109.59 IMeani: 7,109.59 Statistical Data: N (number ofdata points) = 9 t.975 (t-value) = 2.306 Sd (Standard Deviation) = 421,361 CC (Confidence Coefficient) = 323,886 Relative Accuracy (RA): 1.5 %RM BAF Test (mean difference <CC) Pass BAF (Bias Adjustment Factor) 1.000 Remarks: I.RA<10%or0.5pct JR-Al for Certification, 4OCFR7S Applicability 2.Bias pass/fail 3.BAF =1+ ABS(Mean)/CEM avg TEP Irvington Unit #4 CEMS, Cmp. 6—8,9—11 24CEM RELATIVE ACCURACY DETERMINATION Gas Flow -scfh (wet) Client: Tucson Electric Power Date: 06-8,9-11 Location: Irvington Generating Station Source: Unit4 -Low Load Run# Reference Reference CEM Difference (Diff.)”2 Run Time Method Average scTh scth 1 23:38-23:58 13,035,874.2 13,043,205.1 -7,330.9 53,742,094.81 2* 00:17-00:37 13,045,943.3 13,043,205.1 2,738.2 7,497,739.24 3 00:54-01:14 12,838,529.1 12,949,260.9 -110,731.8 12,261,531,531.24 4 01:31-01:51 12,328,040.7 12,958,979.2 -630,938.5 398,083,390,782.25 5 02:07-02:27 12,373,225.2 12,974,482.3 -601,257.1 361,510,100,300.41 6 02:43-03:03 12,692,365.5 12,948,798.0 -256,432.5 65,757,627,056.25 7 03:19-03:39 12,699,951.9 12,949,492.1 -249,540.2 62,270,311,416.04 8 03:54-04:14 12,450,245.3 12,832,871.7 -382,626.4 146,402,961,976.96 9 04:29-04:49 12,747,727.2 12,887,711.2 -139,984.0 19,595,520,256.00 Sum: -2,376,103.2 1,065,942,683,153.2 Mean: 12,690,211.38 12,954,222.84 -264,011.47 Meanl: 264,011.47 Statistical Data: N (number ofdata points) = 9 t.975 (t-value) = 2.306 Sd (Standard Deviation) = 234,154 CC (Confidence Coefficient) = 179,986 Relative Accuracy (RA): 3.5 %RM* BAF Test (mean difference <CC) Fail BAF (Bias Adjustment Factor) 1.020 *RemarI: 1.RA<10% RIVIfor Certification, 40CFR75 Applicability 2.Bias pass/fail 3.BAF =1+ ABS(Mean)/CEM avg TEP Irvington Unit #4 CEMS, Cmp. 6—8,9—11 25Summary of TEP Irvington Generating Station Unit 4- High Load Particulate Emissions 6/9/11 Particulate Emissions Run # Time gr/dscf lb/hr 12-PT 16:25-18:06 0.0074 21.24 13-PT 18:54-19:58 0.0174 49.59 14-PT 20:40-21:43 0.0051 14.65 Mean 12-14 0.0100 28.49 Gas Stream Characteristics Run # Time AWCFM ADCFM DSCFH Ts(°F) %H20 %C0 2 * %02* v/v v/v D v/v D 12-PT 16:25-18:06 585,322.1 542,183.9 20,091,949.0 310 7.37 11.34 8.22 13-PT 18:54-19:58 581,450.1 538,364.6 19,951,900.1 310 7.41 11.57 8.26 14-PT 20:40-21:43 584,768.9 542,373.2 20,103,440.7 310 ‘25 11.55 834 Mean 12-14 583,847.0 540,973.9 20,049,096.6 310 7.34 11.49 8,27* CO, and 02 obtained from concurrent instrument runs.Summary of TEP Irvington Generating Station Unit 4-High Load Gas Flow Summary 6/9/11

Gas Stream Characteristics Run # Time AWCFM ADCFM DSCFH

Ts (°F) %H20, %C02, %02 1-OF 16:25-16:32 602,067.1 557,875.4 20,726,505.7
308 averaged over the 3 2-GF 16:40-16:46 606,190.5 561,675.9 20,831,289.0
309 particulate runs and carried 3-GF 16:56-17:02 592,311.7 548,816.3 20,327,921.1 310

to the individual OF runs 4-GF 17:11-17:17 609,710.5 564,937.4 20,952,250.4
309 5-GF 17:26-17:32 621,225.8 575,607.1 21,292,589.8
311 %H20 7.34 6-OF 17:42-17:48 603,324.2 559,020.1 20,685,151.9
311

v/v 7-OF 17:56-18:02 610,464.8 565,636.3 20,929,967.0
311 8-OF 18:54-19:00 596,183.7 552,403.9 20,440,336.8
311 %C0 2 11.49 9-OF 19:10-19:16 610,464.8 565,636.3 20,929,967.0
311

v/v d Mean 1-9 605,771.5 561,289.9 20,790,664.3 310
%02 8.27 v/v dReview and Certification ALL work, calculations, and other activities and tasks pcrtbrmcd and documejited inthis report bere carried out under my direction and supervision. This test project conforms to EEMC’s Quality Mwiual Idtothe requirements of ASTM D-7036. 2 LC , ,/ L Rafac Qiijjlen Date Division Manager, EEMC Ihave reviewed all testing details, calculations, results, conclusions and other appropriate written materials contained herein, and hereby certifr thatthe presented material is authentic and accurate.

__________________ _/q_i Ed Wadington Date President, EEMC Ihave reviewed, and accept, the production andtest data contained inthis report, and hereby certi& thatitis authentic. Signature Date Name (Printed)

ritle(‘ rnpany 2 TEP Irvington Unit #4 CEMS, Cmp. 6—8,9—11