### Name: Mike O'Brien

Title: Environmental Specialist Company: Platte River Power Authority Sign Date: 7/23/2010 Name: Chet Gutwein Title: Engineer Company: Airtech Environmental Services Inc. Sign Date: 7/23/2010 Permitted Facility Representative / Date Testi ng Company Representative / Date 

## 3190 Platte River Power Authority

Final Test Report for

/ / Based on information and belief formed after reasonable inquiry, I certify that the statements and information in this test report are true, accurate, and complete. I have reviewed all testing details and results in this test report and hereby certify that the test report is authentic and accurate.

Wednesday, July 21, 2010 Page 1 of 21

### 3190 Platte River Power Authority
7/23/2010 Facility Information: Rawhide 2700 East County Road 82

Wellington CO Contact: Mike O'Brien Phone: (970) 222-2325 Fax: Email: obrienm@prpa.org Testing Company: Airtech Environmental Services Inc.
5776 Lamar Street

Arvada CO 80002 Contact: Jeff Johnson Phone: (303) 670-0530 Fax: (303) 670-4130 Email: jjohnson@airtechenv.com

Air Permit Number: 6761 Permitted Source ID/Name: Boiler 101 101 Permitted Maximum Process Rate: N/A Max. Normal Operation Process Rate: N/A Target Process Test Rat N/A

Description of the source (including control equipm ent). Please see the attachments for source or process flow diagram: The Rawhide Energy Station is a pulverized coal fired steam generating electric utility plant serving Northern Colorado. It has a nominal generating capacity of 305 MW (gross) at 100% load and a heat input rate of 2,800 mmBtu per hour based on a coal feed rate of 157 tons per hour (as received). The coal is typically, as received 8,850 Btu per pound and contains 0.28% sulfur and 5.3% ash. The boiler is tangentially fired and is equipped with LNC3 concentric firing low-NOx burners with separated over fire air dampers. The hot boiler flue gas exitsthe air heater in a common inlet duct to the Spray Dry Absorber (SDA)SO2 emissions control inlet manifold. The SDA emissions control system is designed to control both SO2 and particulate. The process is based on initial absorption of SO2 onto "atomized" alkaline particles injected by the three slurry atomizers. The sulf ate-laden flue gas particles, along with existing fly ash, are then separated from the flue gas in two fabric filter baghouses before passing through the two ID fans and into the common stack breech. The maximum EPA allowable sulfur dioxide emission rate is 0.13 lb/mmBtu with at least an 80%reduction of sulfur dioxide in the flue gas. The unit must also achieve a State-only SO2 emission limit of 0.09 lbs/mmBtu (calendar-year average) and a State-only NOx limit of 0.18 lbs/mmBtu (calendar-year average). Industry/SCC/NAIS 221112

Sampling Location Information:

Test Parameter Information: AFS #: 0806900053 FRS #: 110000607148

SCC / Description 10100202 External Combustion Boilers - Electric Generation -Bituminous/Subbituminous Coal - Pulverized Coal: Dry Bottom (Bituminous Coal)

The following state and federal regulations that apply to the proposed testing:

Location Round

Duct Diam. Distance from upstream dist. Distance from

downstream dist. Number of

Traverse Ports Equiv. Diam Min.Travers Points Rect. Duct Length /Width Stack Exit 240 480 1920 4 240 12 0 0



### Wednesday, July 21, 2010 Page 2 of 21

### 3190 Platte River Power Authority
7/23/2010

The following describes any modifications and/or deviations to the applicable test methods. If alternative methods were requested, see the attachments for documentation of request AND approval, including dates. The following is a list of the test methods that are to be used for this test program and their respective promulgation dates: Methods 1 through 29 – August 1997 Method 30B – January 2008 Other Test Methods 27 and 28 – April 2009 SW-846 0010 – September 1986 SW-846 0030 – December 1996

Target Parameter Test

Method Number of

Test Runs Test Run

Duration Sample

Points Comments Location % H2O Method 1 - 4 6 180 0 Stack Exit Carbon Monoxide Method 10 3 120 0 Stack Exit Total organic

compounds (TOC) as Propane Method 25A 3 120 0 Stack Exit

Hydrogen Fluoride Method 26A 3 180 0 Stack Exit Hydrogen Chloride Method 26A 3 180 0 Stack Exit Filterable PM2.5 OTM - 27/28 3 240 0 Use only for dry stacks. Delete Method 5/OTM28 tests. Stack Exit
Total PM2.5 OTM - 27/28 3 240 0 Use only for dry stacks.Delete Method 5/OTM28 tests. Stack Exit
Organic

Condensible Particulate OTM - 27/28 3 240 0 Use only for dry stacks. Delete Method 5/OTM28 tests. Stack Exit

Inorganic

(Aqueous) Condensible Part. OTM - 27/28 3 240 0 Use only for dry stacks. Delete Method 5/OTM28 tests. Stack Exit

Antimony Method 29 3 240 0 Stack Exit Arsenic Method 29 3 240 0 Stack Exit Beryllium Method 29 3 240 0 Stack Exit Cadmium Method 29 3 240 0 Stack Exit Chromium Method 29 3 240 0 Stack Exit Lead Method 29 3 240 0 Stack Exit Manganese Method 29 3 240 0 Stack Exit Nickel Method 29 3 240 0 Stack Exit Filterable

Particulate Method 29 3 240 0 Stack Exit

Cobalt Method 29 0 Stack Exit Phosphorus

(yellow or white) Method 29 0 Stack Exit

Selenium Method 29 3 240 0 Stack Exit Nitrogen oxides

(NOx) Method 7E 3 180 0 Stack Exit



### Wednesday, July 21, 2010 Page 3 of 21

### 3190 Platte River Power Authority
7/23/2010 Sampling / Stack Data Results Summary
Location Stack Exit - Method 1 - 4 Average Run Number 1 2 3 Test Date 5/7/2010 5/7/2010 5/7/2010 Run Start Time 8:16:00 AM 11:00:00 AM 1:50:00 PM

Run Finish Time 10:30:00 AM 1:14:00

PM 4:01:00 PM

Net Run Time, minutes 120 120 120 Dry Gas Meter Volume Sampled, dscf 71.147 71.474 72.41 2 71.678 Moisture Content of Stack Gas, % 14.24 14.38 14.07 14.230 Carbon Dioxide, % 13.2 13.5 13.7 13.467 Oxygen, % 6.3 5.9 6.1 6.100 Average Stack Gas Temperature, °F 200.25 199.42 200.50 200.057 Dry Volumetric Flow Rate, dry scfm 643,526.0 645,586.4 650,324.7 646,479.033 Actual Wet Volumetric Flue Gas Flow Rate, acfm 1,158 ,681.2 1,162,828. 1 1,169,048.5 1,163,519.26 7 Percent Isokinetic of Sampling Rate, % 104.8 105.0 105 .6 105.133 F-Factor, dscfm/MMBtu @ %O2 9612 9602 9582 9,598.667 Fw 0 0 0 0.000 Fc 0 0 0 0.000



### Wednesday, July 21, 2010 Page 4 of 21

### 3190 Platte River Power Authority
7/23/2010
Location Stack Exit - Method 1 - 4 3 Average Run Number 4 5 6 Test Date 5/7/2010 5/7/2010 5/7/2010 Run Start Time 8:16:00 AM 11:00:00 AM 1:50:00 PM

Run Finish Time 10:30:00 AM 1:14:00

PM 4:01:00 PM

Net Run Time, minutes 120 120 120 Dry Gas Meter Volume Sampled, dscf 70.581 69.428 71.48 5 70.498 Moisture Content of Stack Gas, % 14.19 14.24 13.69 14.040 Carbon Dioxide, % 13.2 13.6 13.7 13.500 Oxygen, % 6.3 5.8 6 6.033 Average Stack Gas Temperature, °F 199.08 199.33 198.75 199.053 Dry Volumetric Flow Rate, dry scfm 638,853.0 645,157. 8 657,364.7 647,125.167 Actual Wet Volumetric Flue Gas Flow Rate, acfm 1,147 ,560.0 1,160,000. 7 1,173,383.9 1,160,314.86 7 Percent Isokinetic of Sampling Rate, % 104.8 102.0 103 .1 103.300 F-Factor, dscfm/MMBtu @ %O2 9612 9602 9582 9,598.667 Fw 0 0 0 0.000 Fc 0 0 0 0.000



### Location Stack Exit - Method 10 Average Run Number 1 2 3 Test Date 5/7/2010 5/7/2010 5/7/2010 Run Start Time 8:16:00 AM 10:58:00 AM 1:31:00 PM

Run Finish Time 10:30:00 AM 1:13:00

PM 3:04:00 PM

Carbon Dioxide, % 13.2 13.5 13.7 13.467 Oxygen, % 6.3 5.9 6.1 6.100 Dry Volumetric Flow Rate, dry scfm 643117 645419 650002 646,179.333 F-Factor, dscfm/MMBtu @ %O2 9612 9602 9575 9,596.333 Moisture, % 14.3 14.4 14.1 14.267 Fuel Type Override Override Override Fw 0 0 0 0.000 Fc 0 0 0 0.000



### Wednesday, July 21, 2010 Page 5 of 21

### 3190 Platte River Power Authority
7/23/2010
Location Stack Exit - Method 25A Average Run Number 1 2 3 Test Date 5/7/2010 5/7/2010 5/7/2010 Run Start Time 8:14:00 AM 10:59:00 AM 1:49:00 PM

Run Finish Time 10:30:00 AM 1:16:00

PM 4:00:00 PM

Carbon Dioxide, % 13.2 13.5 13.7 13.467 Oxygen, % 6.3 5.9 6.1 6.100 Dry Volumetric Flow Rate, dry scfm 643117 645419 650002 646,179.333 F-Factor, dscfm/MMBtu @ %O2 9612 9602 9582 9,598.667 Moisture, % 14.3 14.4 14.1 14.267 Fuel Type Override Override Override Fw 0 0 0 0.000 Fc 0 0 0 0.000



### Location Stack Exit - Method 26A Average Run Number 2 3 4 Test Date 5/5/2010 5/5/2010 5/6/2010 Run Start Time 7:58:00 AM 11:29:00 AM 7:55:00 AM

Run Finish Time 11:07:00 AM 2:34:00

PM 11:03:00

AM Net Run Time, minutes 180 180 180 Dry Gas Meter Volume Sampled, dscf 110.960 100.105 112 .607 107.891 Moisture Content of Stack Gas, % 13.05 13.68 13.64 13.457 Carbon Dioxide, % 13.5 13.2 13.5 13.400 Oxygen, % 6.4 6.3 6.3 6.333 Average Stack Gas Temperature, °F 198.67 199.28 201.83 199.927 Dry Volumetric Flow Rate, dry scfm 696,900.8 628,603. 5 697,058.5 674,187.600 Actual Wet Volumetric Flue Gas Flow Rate, acfm 1,238 ,226.3 1,126,071. 5 1,264,992.6 1,209,763.46 7 Percent Isokinetic of Sampling Rate, % 100.6 100.7 102 .1 101.133 F-Factor, dscfm/MMBtu @ %O2 9644 9640 9652 9,645.333 Fw 0 0 0 0.000 Fc 0 0 0 0.000



### Wednesday, July 21, 2010 Page 6 of 21

### 3190 Platte River Power Authority
7/23/2010
Location Stack Exit - Method 29 Average Run Number 1 2 3 Test Date 5/4/2010 5/5/2010 5/6/2010 Run Start Time 9:30:00 AM 8:10:00 AM 8:00:00 AM

Run Finish Time 3:05:00 PM 1:00:00 PM 1:15:00 PM

Net Run Time, minutes 240 240 240 Dry Gas Meter Volume Sampled, dscf 148.249 149.503 164 .479 154.077 Moisture Content of Stack Gas, % 12.91 13.67 12.87 13.1 50 Carbon Dioxide, % 13.5 13.2 13.5 13.400 Oxygen, % 6.4 6.13 6.33 6.287 Average Stack Gas Temperature, °F 199.75 200.42 203.96 201.377 Dry Volumetric Flow Rate, dry scfm 550,581.7 703,439. 9 715,641.6 656,554.400 Actual Wet Volumetric Flue Gas Flow Rate, acfm 990,1 66.3 1,262,165. 2 1,291,382.0 1,181,237.83 3 Percent Isokinetic of Sampling Rate, % 101.8 100.8 109 .0 103.867 F-Factor, dscfm/MMBtu @ %O2 9640 9631 9631 9,634.000 Fw 0 0 0 0.000 Fc 0 0 0 0.000



### Location Stack Exit - Method 7E Average Run Number 2 3 4 Test Date 5/5/2010 5/5/2010 5/6/2010 Run Start Time 11:04:00 AM 11:28:00

AM 7:55:00 AM

Run Finish Time 11:07:00 AM 1:46:00

PM 11:03:00

AM Carbon Dioxide, % 13.5 13.2 13.5 13.400 Oxygen, % 6.4 6.3 6.3 6.333 Dry Volumetric Flow Rate, dry scfm 696928 628339 696742 674,003.000 F-Factor, dscfm/MMBtu @ %O2 9610 9640 9656 9,635.333 Moisture, % 13.1 13.7 13.7 13.500 Fuel Type Override Override Override Fw 0 0 0 0.000 Fc 0 0 0 0.000



### Wednesday, July 21, 2010 Page 7 of 21

### 3190 Platte River Power Authority
7/23/2010
Location Stack Exit - OTM - 27/28 Average Run Number 1 2 3 Test Date 5/4/2010 5/5/2010 5/6/2010 Run Start Time 9:00:00 AM 8:01:00 AM 7:55:00 AM

Run Finish Time 5:08:00 PM 3:43:00 PM 4:00:00 PM

Net Run Time, minutes 450 450 450 Dry Gas Meter Volume Sampled, dscf 118.976 126.335 131 .235 125.515 Moisture Content of Stack Gas, % 13.04 13.78 13.95 13.5 90 Carbon Dioxide, % 13.5 13.2 13.5 13.400 Oxygen, % 6.4 6.27 6.33 6.333 Average Stack Gas Temperature, °F 199.58 201.00 202.83 201.137 Dry Volumetric Flow Rate, dry scfm 547,598.5 724,779. 6 719,033.2 663,803.767 Actual Wet Volumetric Flue Gas Flow Rate, acfm 986,0 19.4 1,303,257. 2 1,311,551.0 1,200,275.86 7 Percent Isokinetic of Sampling Rate, % 94.0 92.9 97.2 94.700 F-Factor, dscfm/MMBtu @ %O2 9656 9642 9629 9,642.333 Fw 0 0 0 0.000 Fc 0 0 0 0.000



### Wednesday, July 21, 2010 Page 8 of 21

### 3190 Platte River Power Authority
7/23/2010 Emissions Summary
Location: Stack Exit - Method 1 - 4 Compound: % H2O Average RunNumber 1 2 3 Mass_mg 251000 255000 252000 252,666.667



### Location: Stack Exit - Method 1 - 4 3 Compound: % H2O Average RunNumber 4 5 6 Mass_mg 248000 245000 241000 244,666.667



### Location: Stack Exit - Method 10 Compound: Carbon Monoxide Average Run 1 2 3 lb/mmBtuO2 3.74E-02 6.05E-02 5.51E-02 0.051 ppm 3.74E+01 6.22E+01 5.61E+01 51.900 ppm@7%O2 3.56E+01 5.76E+01 5.27E+01 48.633



### Location: Stack Exit - Method 25A Compound: Total organic compounds (TOC) as Average Run 1 2 3 lb/mmBtuO2 1.83E-03 1.79E-03 1.80E-03 0.002 ppm 1.16E+00 1.17E+00 1.16E+00 1.163 ppm@7%O2 1.10E+00 1.08E+00 1.09E+00 1.090



### Location: Stack Exit - Method 26A Compound: Hydrogen Chloride Average RunNumber 2 3 4 Mass_mg 1.82 0.541 0 0.787 lb/mmBtuO2 5.03E-04 1.64E-04 0.00E+00 0.000 mg/dscm 5.79E-01 1.91E-01 0.00E+00 0.257 mg/dscm@7%O2 5.55E-01 1.82E-01 0.00E+00 0.246 

### Compound: Hydrogen Fluoride Average RunNumber 2 3 4 Mass_mg 0.165 0.156 0 0.107 lb/mmBtuO2 4.56E-05 4.74E-05 0.00E+00 0.000 mg/dscm 5.25E-02 5.50E-02 0.00E+00 0.036 mg/dscm@7%O2 5.03E-02 5.24E-02 0.00E+00 0.034



### Location: Stack Exit - Method 29 Compound: Antimony Average

Wednesday, July 21, 2010 Page 9 of 21

### 3190 Platte River Power Authority
7/23/2010 RunNumber 1 2 3 Mass_mg 0.000222 0.000286 0.000249 0.000 Elb/hr 1.09E-04 1.78E-04 1.43E-04 0.000 lb/mmBtuO2 4.59E-08 5.75E-08 4.61E-08 0.000 mg/dscm 5.29E-05 6.76E-05 5.35E-05 0.000 mg/dscm@7%O2 5.07E-05 6.36E-05 5.10E-05 0.000 

### Compound: Arsenic Average RunNumber 1 2 3 Mass_mg 0.000378 0.000341 0.000389 0.000 Elb/hr 1.86E-04 2.12E-04 2.24E-04 0.000 lb/mmBtuO2 7.81E-08 6.85E-08 7.20E-08 0.000 mg/dscm 9.01E-05 8.06E-05 8.35E-05 0.000 mg/dscm@7%O2 8.64E-05 7.59E-05 7.97E-05 0.000 

### Compound: Beryllium Average RunNumber 1 2 3 Mass_mg 0.000061 0.00005 0.000058 0.000 Elb/hr 3.00E-05 3.11E-05 3.34E-05 0.000 lb/mmBtuO2 1.26E-08 1.00E-08 1.07E-08 0.000 mg/dscm 1.45E-05 1.18E-05 1.25E-05 0.000 mg/dscm@7%O2 1.39E-05 1.11E-05 1.19E-05 0.000 

### Compound: Cadmium Average RunNumber 1 2 3 Mass_mg 0.000406 0.000435 0.000375 0.000 Elb/hr 1.99E-04 2.71E-04 2.16E-04 0.000 lb/mmBtuO2 8.39E-08 8.74E-08 6.94E-08 0.000 mg/dscm 9.67E-05 1.03E-04 8.05E-05 0.000 mg/dscm@7%O2 9.27E-05 9.69E-05 7.68E-05 0.000 

### Compound: Chromium Average RunNumber 1 2 3 Mass_mg 0.00181 0.0011 0.00149 0.001 Elb/hr 8.89E-04 6.85E-04 8.58E-04 0.001 lb/mmBtuO2 3.74E-07 2.21E-07 2.76E-07 0.000 mg/dscm 4.31E-04 2.60E-04 3.20E-04 0.000 mg/dscm@7%O2 4.13E-04 2.45E-04 3.05E-04 0.000 

### Compound: Cobalt Average RunNumber 1 2 3 Mass_mg 0.000524 0.000359 0.000384 0.000 Elb/hr 2.57E-04 2.23E-04 2.21E-04 0.000 lb/mmBtuO2 1.08E-07 7.21E-08 7.11E-08 0.000 mg/dscm 1.25E-04 8.48E-05 8.25E-05 0.000 mg/dscm@7%O2 1.20E-04 7.98E-05 7.87E-05 0.000 

### Compound: Filterable Particulate Average
Wednesday, July 21, 2010 Page 10 of 21

### 3190 Platte River Power Authority
7/23/2010 RunNumber 1 2 3 Mass_mg 12.4 12.5 9.6 11.500 Elb/hr 6.09E+00 7.78E+00 5.53E+00 6.467 lb/mmBtuO2 2.56E-03 2.51E-03 1.78E-03 0.002 mg/dscm 2.95E+00 2.95E+00 2.06E+00 2.653 mg/dscm@7%O2 2.83E+00 2.78E+00 1.97E+00 2.527 

### Compound: Lead Average RunNumber 1 2 3 Mass_mg 0.000692 0.000964 0.000326 0.001 Elb/hr 3.40E-04 6.00E-04 1.88E-04 0.000 lb/mmBtuO2 1.43E-07 1.94E-07 6.04E-08 0.000 mg/dscm 1.65E-04 2.28E-04 7.00E-05 0.000 mg/dscm@7%O2 1.58E-04 2.15E-04 6.68E-05 0.000 

### Compound: Manganese Average RunNumber 1 2 3 Mass_mg 0.0032 0.00181 0.002 0.002 Elb/hr 1.57E-03 1.13E-03 1.15E-03 0.001 lb/mmBtuO2 6.61E-07 3.64E-07 3.70E-07 0.000 mg/dscm 7.62E-04 4.28E-04 4.29E-04 0.001 mg/dscm@7%O2 7.30E-04 4.03E-04 4.09E-04 0.001 

### Compound: Nickel Average RunNumber 1 2 3 Mass_mg 0.00217 0.000863 0.00131 0.001 Elb/hr 1.07E-03 5.37E-04 7.54E-04 0.001 lb/mmBtuO2 4.48E-07 1.73E-07 2.43E-07 0.000 mg/dscm 5.17E-04 2.04E-04 2.81E-04 0.000 mg/dscm@7%O2 4.96E-04 1.92E-04 2.68E-04 0.000 

### Compound: Phosphorus (yellow or white) Average RunNumber 1 2 3 Mass_mg 0.299 0.292 0.288 0.293 Elb/hr 1.47E-01 1.82E-01 1.66E-01 0.165 lb/mmBtuO2 6.18E-05 5.87E-05 5.33E-05 0.000 mg/dscm 7.12E-02 6.90E-02 6.18E-02 0.067 mg/dscm@7%O2 6.83E-02 6.49E-02 5.90E-02 0.064 

### Compound: Selenium Average RunNumber 1 2 3 Mass_mg 0.0002 0.000218 0.0002 0.000 Elb/hr 9.83E-05 1.36E-04 1.15E-04 0.000 lb/mmBtuO2 4.13E-08 4.38E-08 3.70E-08 0.000 mg/dscm 4.76E-05 5.15E-05 4.29E-05 0.000 mg/dscm@7%O2 4.56E-05 4.85E-05 4.09E-05 0.000



### Location: Stack Exit - Method 7E

Wednesday, July 21, 2010 Page 11 of 21

### 3190 Platte River Power Authority
7/23/2010 Compound: Nitrogen oxides (NOx) Average Run 2 3 4 lb/mmBtuO2 1.78E-01 1.71E-01 2.04E-01 0.184 ppm 1.08E+02 1.04E+02 1.24E+02 112.000 ppm@7%O2 1.04E+02 9.90E+01 1.18E+02 107.000



### Location: Stack Exit - OTM - 27/28 Compound: Filterable PM2.5 Average RunNumber 1 2 3 Mass_mg 0.8 1.2 0 0.667 lb/mmBtuO2 2.06E-04 2.88E-04 0.00E+00 0.000 

### Compound: Inorganic (Aqueous) Condensible Pa Average RunNumber 1 2 3 Mass_mg 55.8 63.8 43.5 54.367 lb/mmBtuO2 1.44E-02 1.53E-02 1.01E-02 0.013 

### Compound: Organic Condensible Particulate Average RunNumber 1 2 3 Mass_mg 2.9 4 4.2 3.700 lb/mmBtuO2 7.48E-04 9.61E-04 9.75E-04 0.001 

### Compound: Total PM2.5 Average RunNumber 1 2 3 Mass_mg 59.5 69 47.7 58.733 lb/mmBtuO2 1.53E-02 1.66E-02 1.11E-02 0.014



### Wednesday, July 21, 2010 Page 12 of 21

### 3190 Platte River Power Authority
7/23/2010 Process Run Data

APCD Run Data

Process Lab Run Data Run Name Value UOM Comments Target Value 1 Coal Burned 0.148 1000 Tons/hr 0.15 2 Coal Burned 0.156 1000 Tons/hr 0.15 3 Coal Burned 0.146 1000 Tons/hr 0.15 1 Average Heat Input 2619 MMBtu/hr 2500 2 Average Heat Input 2754 MMBtu/hr 2500 3 Average Heat Input 2583 MMBtu/hr 2500 1 Steam Output 1756 1000 lb steam/hr 1800 2 Steam Output 1883 1000 lb steam/hr 1800 3 Steam Output 1748 1000 lb steam/hr 1800 1 Flue Gas Flow Rate 564156 kscfh 40000 1 Flue Gas Oxygen Content 5.23 % 6 1 Flue Gas Carbon Dioxide Content 14.1 % 14 1 Flue Gas Sampling Point Temperature 204 Deg F 200 1 Unit Net Electric Generation 285 MWh 280

Run Name Value UOM Comments Target Value 1 BAGHOUSE 0 lb/mmBtu 0
1 OVERFIRE AIR 0 lb/mmBtu 0
1 SPRAY DRYER 0 lb/mmBtu 0

Wednesday, July 21, 2010 Page 13 of 21

### 3190 Platte River Power Authority
7/23/2010 Sampling / Stack Data Results Detail
Location Stack Exit - Method 1 - 4 Average Run Number 1 2 3 Test Date 5/7/2010 5/7/2010 5/7/2010 Run Start Time 8:16:00 AM 11:00:00 AM 1:50:00 PM

Run Finish Time 10:30:00 AM 1:14:00 PM 4:01:00 PM Net Traversing Points 12 12 12 Net Run Time, minutes 120 120 120 Nozzle Diameter, inches 0.225 0.225 0.225 0.225 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 1.0018 1.0018 1.0018 1 .002 Barometric Pressure, inches of Mercury 24.25 24.25 24. 25 24.250 Average Orifice Meter Differential, inches H2O 1.38 1 .40 1.45 1.410 Dry Gas Meter Volume Sampled, cubic feet 86.330 88.05 0 89.310 87.897 Average Dry Gas Meter Temperature, °F 62.38 70.38 71.0 8 67.947 Dry Gas Meter Volume Sampled, dscf 71.147 71.474 72.41 2 71.678 Total Moisture Liquid collected, g 251 255 252 252.667 Volume of Water Vapor, standard cubic feet 11.81 12.00 11.86 11.890 Moisture Content of Stack Gas, % 14.24 14.38 14.07 14.230 Moisture Saturation at Stack Gas Temperature, % 97.2 6 95.60 97.77 96.877 Dry Mole Fraction 0.8576 0.8562 0.8593 0.858 Carbon Dioxide, % 13.2 13.5 13.7 13.467 Oxygen, % 6.3 5.9 6.1 6.100 Carbon Monoxide & Nitrogen, % 80.5 80.6 80.2 80.433 Fuel Factor 1.11 1.11 1.08 Dry Molecular Weight, lb/lb-Mole 30.36 30.40 30.44 30.400 Wet Molecular weight, lb/lb-Mole 28.60 28.62 28.69 28.637 Flue Gas Static Pressure, inches of H2O -0.3 -0.3 -0.3 -0.300 Absolute Flue Gas Pressure, inches of Mercury 24.23 24.23 24.23 24.230 Average Stack Gas Temperature, °F 200.25 199.42 200.50 200.057 Average Velocity Head, inches of H2O 0.769 0.776 0.78 5 0.777 Average Stack Gas Velocity, feet/second 61.47 61.69 62 .02 61.727 Stack Cross-Sectional Area, square feet 314.159 314.1 59 314.159 314.159 Dry Volumetric Flow Rate, dry scfm 643,526.0 645,586.4 650,324.7 646,479.033 Actual Wet Volumetric Flue Gas Flow Rate, acfm 1,158 ,681.2 1,162,828.1 1,169,048.5 1,163,519.2 67 Percent Isokinetic of Sampling Rate, % 104.8 105.0 105 .6 105.133 Percent Excess Air, % 42.1 38.4 40.5 40.333 F-Factor, dscfm/MMBtu @ %O2 9612 9602 9582 9,598.667 Round Duct Diameter, inches 240 240 240 Rectangular Duct Width, inches 0 0 0 Rectangular Duct Length, inches 0 0 0 Fw 0 0 0 0.000 Fc 0 0 0 0.000



### Wednesday, July 21, 2010 Page 14 of 21

### 3190 Platte River Power Authority
7/23/2010
Location Stack Exit - Method 1 - 4 3 Average Run Number 4 5 6 Test Date 5/7/2010 5/7/2010 5/7/2010 Run Start Time 8:16:00 AM 11:00:00 AM 1:50:00 PM

Run Finish Time 10:30:00 AM 1:14:00 PM 4:01:00 PM Net Traversing Points 12 12 12 Net Run Time, minutes 120 120 120 Nozzle Diameter, inches 0.225 0.225 0.225 0.225 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 1.0163 1.0163 1.0163 1 .016 Barometric Pressure, inches of Mercury 24.25 24.25 24. 25 24.250 Average Orifice Meter Differential, inches H2O 1.32 1 .31 1.43 1.353 Dry Gas Meter Volume Sampled, cubic feet 84.820 85.100 87.700 85.873 Average Dry Gas Meter Temperature, °F 64.75 75.21 75.8 8 71.947 Dry Gas Meter Volume Sampled, dscf 70.581 69.428 71.48 5 70.498 Total Moisture Liquid collected, g 248 245 241 244.667 Volume of Water Vapor, standard cubic feet 11.67 11.5 3 11.34 11.513 Moisture Content of Stack Gas, % 14.19 14.24 13.69 14.040 Moisture Saturation at Stack Gas Temperature, % 94.93 95.42 94.28 94.877 Dry Mole Fraction 0.8581 0.8576 0.8631 0.860 Carbon Dioxide, % 13.2 13.6 13.7 13.500 Oxygen, % 6.3 5.8 6 6.033 Carbon Monoxide & Nitrogen, % 80.5 80.6 80.3 80.467 Fuel Factor 1.11 1.11 1.09 Dry Molecular Weight, lb/lb-Mole 30.36 30.41 30.43 30.400 Wet Molecular weight, lb/lb-Mole 28.61 28.64 28.73 28.660 Flue Gas Static Pressure, inches of H2O -0.3 -0.3 -0.3 -0.300 Absolute Flue Gas Pressure, inches of Mercury 24.23 24.23 24.23 24.230 Average Stack Gas Temperature, °F 199.08 199.33 198.75 199.053 Average Velocity Head, inches of H2O 0.756 0.773 0.794 0.774 Average Stack Gas Velocity, feet/second 60.88 61.54 62 .25 61.557 Stack Cross-Sectional Area, square feet 314.159 314.1 59 314.159 314.159 Dry Volumetric Flow Rate, dry scfm 638,853.0 645,157. 8 657,364.7 647,125.167 Actual Wet Volumetric Flue Gas Flow Rate, acfm 1,147 ,560.0 1,160,000.7 1,173,383.9 1,160,314.8 67 Percent Isokinetic of Sampling Rate, % 104.8 102.0 103 .1 103.300 Percent Excess Air, % 42.1 37.5 39.5 39.700 F-Factor, dscfm/MMBtu @ %O2 9612 9602 9582 9,598.667 Round Duct Diameter, inches 240 240 240 Rectangular Duct Width, inches 0 0 0 Rectangular Duct Length, inches 0 0 0 Fw 0 0 0 0.000 Fc 0 0 0 0.000



### Wednesday, July 21, 2010 Page 15 of 21

### 3190 Platte River Power Authority
7/23/2010
Location Stack Exit - Method 10 Average Run Number 1 2 3 Test Date 5/7/2010 5/7/2010 5/7/2010 Run Start Time 8:16:00 AM 10:58:00 AM 1:31:00 PM

Run Finish Time 10:30:00 AM 1:13:00 PM 3:04:00 PM Carbon Dioxide, % 13.2 13.5 13.7 13.467 Oxygen, % 6.3 5.9 6.1 6.100 Fuel Factor 1.11 1.11 1.08 Dry Volumetric Flow Rate, dry scfm 643117 645419 650002 646,179.333 F-Factor, dscfm/MMBtu @ %O2 9612 9602 9575 9,596.333 Moisture, % 14.3 14.4 14.1 14.267 Analyzer Make #Num! Analyzer Model #Num! Analyzer Serial Number #Num! Operating Range 1000 1000 1000 1,000.000 Operating Units ppm ppm ppm No. Readings/Avg. 600 600 600 600.000 Calibration Set 10 10 10 10.000 Calibration Pre Zero Cylinder ID Zero Zero Zero Calibration Pre Zero Cylinder Instrument Response -0 .1 0 -0.2 -0.100 Calibration Pre Zero Cylinder Bias 0 0.1 -0.1 0.000 Calibration Pre Zero Cylinder Drift 0 0 0 0.000 Calibration Pre High Cylinder ID XC030124B XC030124B XC030124B Calibration Pre High Cylinder Instrument Response 48 .9 50.5 51.1 50.167 Calibration Pre High Cylinder Bias 0 1.58 2.17 1.250 Calibration Pre High Cylinder Drift 0 0 0 0.000 Calibration Post Zero Cylinder ID Zero Zero Zero Calibration Post Zero Cylinder Instrument Response 0 -0.2 0.6 0.133 Calibration Post Zero Cylinder Bias 0.1 -0.1 0.69 0.230 Calibration Post Zero Cylinder Drift 0.1 0.2 0.79 0.363 Calibration Post High Cylinder ID XC030124B XC030124B XC030124B Calibration Post High Cylinder Instrument Response 5 0.5 51.1 54.1 51.900 Calibration Post High Cylinder Bias 1.58 2.17 5.12 2.95 7 Calibration Post High Cylinder Drift 1.58 0.59 2.95 1.707 Cavg 32.2 54.8 51.3 46.100 Cavg Units ppmvw ppmvw ppmvw Cgas 37.3514 62.2203 56.0593 51.877 Cgas Units ppmvd ppmvd ppmvd Fuel Type Override Override Override Fw 0 0 0 0.000 Fc 0 0 0 0.000 Cgasw 32.010150753 7688 53.26055009

82318 48.15492366

41221 44.475
Cgasw Units ppmvw ppmvw ppmvw



### Wednesday, July 21, 2010 Page 16 of 21

### 3190 Platte River Power Authority
7/23/2010
Location Stack Exit - Method 25A Average Run Number 1 2 3 Test Date 5/7/2010 5/7/2010 5/7/2010 Run Start Time 8:14:00 AM 10:59:00 AM 1:49:00 PM

Run Finish Time 10:30:00 AM 1:16:00 PM 4:00:00 PM Carbon Dioxide, % 13.2 13.5 13.7 13.467 Oxygen, % 6.3 5.9 6.1 6.100 Fuel Factor 1.11 1.11 1.08 Dry Volumetric Flow Rate, dry scfm 643117 645419 650002 646,179.333 F-Factor, dscfm/MMBtu @ %O2 9612 9602 9582 9,598.667 Moisture, % 14.3 14.4 14.1 14.267 Analyzer Make #Num! Analyzer Model #Num! Analyzer Serial Number #Num! Operating Range 1000 1000 1000 1,000.000 Operating Units ppm ppm ppm No. Readings/Avg. 600 600 600 600.000 Calibration Set 25 25 25 25.000 Calibration Pre Zero Cylinder ID Zero Zero Zero Calibration Pre Zero Cylinder Instrument Response 0 0 0 0.000 Calibration Pre Zero Cylinder Bias 0.33 0 0 0.110 Calibration Pre Zero Cylinder Drift 0 0 0 0.000 Calibration Pre High Cylinder ID CC52193 CC52193 CC521 93 Calibration Pre High Cylinder Instrument Response 30 .2 30.2 30.2 30.200 Calibration Pre High Cylinder Bias 2.32 0 0 0.773 Calibration Pre High Cylinder Drift 0 0 0 0.000 Calibration Post Zero Cylinder ID Zero Zero Zero Calibration Post Zero Cylinder Instrument Response 0 0 0 0.000 Calibration Post Zero Cylinder Bias 0 0 0 0.000 Calibration Post Zero Cylinder Drift 0.33 0 0 0.110 Calibration Post High Cylinder ID CC52193 CC52193 CC52 193 Calibration Post High Cylinder Instrument Response 3 0.2 30.2 30.2 30.200 Calibration Post High Cylinder Bias 2.32 0 0 0.773 Calibration Post High Cylinder Drift 2.32 0 0 0.773 Cavg 1 1 1 1.000 Cavg Units ppmvw ppmvw ppmvw Cgas 1.1649 1.1663 1.1622 1.164 Cgas Units ppmvd ppmvd ppmvd Fuel Type Override Override Override Fw 0 0 0 0.000 Fc 0 0 0 0.000 Cgasw 0.9983443708 60927 0.998344370

860927 0.998344370

860927 0.998
Cgasw Units ppmvw ppmvw ppmvw



### Wednesday, July 21, 2010 Page 17 of 21

### 3190 Platte River Power Authority
7/23/2010
Location Stack Exit - Method 26A Average Run Number 2 3 4 Test Date 5/5/2010 5/5/2010 5/6/2010 Run Start Time 7:58:00 AM 11:29:00 AM 7:55:00 AM

Run Finish Time 11:07:00 AM 2:34:00 PM 11:03:00 AM Net Traversing Points 18 18 18 Net Run Time, minutes 180 180 180 Nozzle Diameter, inches 0.225 0.225 0.225 0.225 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 1.0045 1.0045 1.0045 1 .005 Barometric Pressure, inches of Mercury 24.15 24.15 23. 94 24.080 Average Orifice Meter Differential, inches H2O 1.77 1 .47 1.82 1.687 Dry Gas Meter Volume Sampled, cubic feet 140.770 128. 580 143.300 137.550 Average Dry Gas Meter Temperature, °F 86.03 92.33 83.06 87.140 Dry Gas Meter Volume Sampled, dscf 110.960 100.105 112 .607 107.891 Total Moisture Liquid collected, g 354 337 378 356.333 Volume of Water Vapor, standard cubic feet 16.66 15.8 6 17.79 16.770 Moisture Content of Stack Gas, % 13.05 13.68 13.64 13.457 Moisture Saturation at Stack Gas Temperature, % 94.3 9 95.60 101.75 97.247 Dry Mole Fraction 0.8695 0.8632 0.8636 0.865 Carbon Dioxide, % 13.5 13.2 13.5 13.400 Oxygen, % 6.4 6.3 6.3 6.333 Carbon Monoxide & Nitrogen, % 80.1 80.5 80.2 80.267 Fuel Factor 1.07 1.11 1.08 Dry Molecular Weight, lb/lb-Mole 30.42 30.36 30.41 30.3 97 Wet Molecular weight, lb/lb-Mole 28.80 28.67 28.72 28.7 30 Flue Gas Static Pressure, inches of H2O 0.1 0.1 -0.2 0. 000 Absolute Flue Gas Pressure, inches of Mercury 24.16 24.16 23.93 24.083 Average Stack Gas Temperature, °F 198.67 199.28 201.83 199.927 Average Velocity Head, inches of H2O 0.884 0.727 0.907 0.839 Average Stack Gas Velocity, feet/second 65.69 59.74 67 .11 64.180 Stack Cross-Sectional Area, square feet 314.159 314.1 59 314.159 314.159 Dry Volumetric Flow Rate, dry scfm 696,900.8 628,603. 5 697,058.5 674,187.600 Actual Wet Volumetric Flue Gas Flow Rate, acfm 1,238 ,226.3 1,126,071.5 1,264,992.6 1,209,763.4 67 Percent Isokinetic of Sampling Rate, % 100.6 100.7 102 .1 101.133 Percent Excess Air, % 43.4 42.1 42.4 42.633 F-Factor, dscfm/MMBtu @ %O2 9644 9640 9652 9,645.333 Round Duct Diameter, inches 240 240 240 Rectangular Duct Width, inches 0 0 0 Rectangular Duct Length, inches 0 0 0 Fw 0 0 0 0.000 Fc 0 0 0 0.000



### Wednesday, July 21, 2010 Page 18 of 21

### 3190 Platte River Power Authority
7/23/2010
Location Stack Exit - Method 29 Average Run Number 1 2 3 Test Date 5/4/2010 5/5/2010 5/6/2010 Run Start Time 9:30:00 AM 8:10:00 AM 8:00:00 AM Run Finish Time 3:05:00 PM 1:00:00 PM 1:15:00 PM Net Traversing Points 12 12 12 Net Run Time, minutes 240 240 240 Nozzle Diameter, inches 0.252 0.225 0.225 0.234 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 1.0018 1.0018 1.0018 1 .002 Barometric Pressure, inches of Mercury 23.89 24.15 23. 94 23.993 Average Orifice Meter Differential, inches H2O 1.53 1 .66 1.90 1.697 Dry Gas Meter Volume Sampled, cubic feet 188.250 190. 340 207.810 195.467 Average Dry Gas Meter Temperature, °F 78.83 86.31 77.8 5 80.997 Dry Gas Meter Volume Sampled, dscf 148.249 149.503 164 .479 154.077 Total Moisture Liquid collected, g 467 503 516 495.333 Volume of Water Vapor, standard cubic feet 21.98 23.6 8 24.29 23.317 Moisture Content of Stack Gas, % 12.91 13.67 12.87 13.1 50 Moisture Saturation at Stack Gas Temperature, % 97.7 1 97.89 106.30 100.633 Dry Mole Fraction 0.8709 0.8633 0.8713 0.869 Carbon Dioxide, % 13.5 13.2 13.5 13.400 Oxygen, % 6.4 6.13 6.33 6.287 Carbon Monoxide & Nitrogen, % 80.1 80.67 80.17 80.313 Fuel Factor 1.07 1.12 1.08 Dry Molecular Weight, lb/lb-Mole 30.42 30.36 30.41 30.3 97 Wet Molecular weight, lb/lb-Mole 28.82 28.67 28.81 28.7 67 Flue Gas Static Pressure, inches of H2O -0.3 0.1 -0.2 -0.133 Absolute Flue Gas Pressure, inches of Mercury 23.87 24.16 23.93 23.987 Average Stack Gas Temperature, °F 199.75 200.42 203.96 201.377 Average Velocity Head, inches of H2O 0.558 0.912 0.945 0.805 Average Stack Gas Velocity, feet/second 52.53 66.96 68 .51 62.667 Stack Cross-Sectional Area, square feet 314.159 314.1 59 314.159 314.159 Dry Volumetric Flow Rate, dry scfm 550,581.7 703,439. 9 715,641.6 656,554.400 Actual Wet Volumetric Flue Gas Flow Rate, acfm 990,1 66.3 1,262,165.2 1,291,382.0 1,181,237.8 33 Percent Isokinetic of Sampling Rate, % 101.8 100.8 109 .0 103.867 Percent Excess Air, % 43.4 40.4 42.7 42.167 F-Factor, dscfm/MMBtu @ %O2 9640 9631 9631 9,634.000 Round Duct Diameter, inches 240 240 240 Rectangular Duct Width, inches 0 0 0 Rectangular Duct Length, inches 0 0 0 Fw 0 0 0 0.000 Fc 0 0 0 0.000



### Wednesday, July 21, 2010 Page 19 of 21

### 3190 Platte River Power Authority
7/23/2010
Location Stack Exit - Method 7E Average Run Number 2 3 4 Test Date 5/5/2010 5/5/2010 5/6/2010 Run Start Time 11:04:00 AM 11:28:00 AM 7:55:00 AM

Run Finish Time 11:07:00 AM 1:46:00 PM 11:03:00 AM Carbon Dioxide, % 13.5 13.2 13.5 13.400 Oxygen, % 6.4 6.3 6.3 6.333 Fuel Factor 1.07 1.11 1.08 Dry Volumetric Flow Rate, dry scfm 696928 628339 696742 674,003.000 F-Factor, dscfm/MMBtu @ %O2 9610 9640 9656 9,635.333 Moisture, % 13.1 13.7 13.7 13.500 Analyzer Make #Num! Analyzer Model #Num! Analyzer Serial Number #Num! Operating Range 1000 1000 1000 1,000.000 Operating Units ppm ppm ppm No. Readings/Avg. 600 600 600 600.000 Calibration Set 71 71 72 71.333 Calibration Pre Zero Cylinder ID Zero Zero Zero Calibration Pre Zero Cylinder Instrument Response -0 .8 0.3 -0.7 -0.400 Calibration Pre Zero Cylinder Bias 0 0.61 0 0.203 Calibration Pre Zero Cylinder Drift 0 0 0 0.000 Calibration Pre High Cylinder ID AAL933 AAL933 AAL933 Calibration Pre High Cylinder Instrument Response 17 6 210 169 185.000 Calibration Pre High Cylinder Bias 0 18.99 0 6.330 Calibration Pre High Cylinder Drift 0 0 0 0.000 Calibration Post Zero Cylinder ID Zero Zero Zero Calibration Post Zero Cylinder Instrument Response 0 .3 0.1 -0.8 -0.133 Calibration Post Zero Cylinder Bias 0.61 0.5 -0.06 0.35 0 Calibration Post Zero Cylinder Drift 0.61 0.11 0.06 0.2 60 Calibration Post High Cylinder ID AAL933 AAL933 AAL933 Calibration Post High Cylinder Instrument Response 2 10 206 174 196.667 Calibration Post High Cylinder Bias 18.99 16.76 2.79 12 .847 Calibration Post High Cylinder Drift 18.99 2.23 2.79 8. 003 Cavg 101 104 102 102.333 Cavg Units ppmvw ppmvw ppmvw Cgas 107.9217 103.6082 123.7271 111.752 Cgas Units ppmvd ppmvd ppmvd Fuel Type Override Override Override Fw 0 0 0 0.000 Fc 0 0 0 0.000 Cgasw 93.783958602 8461 89.41385948

02695 106.7764876

6328 96.658
Cgasw Units ppmvw ppmvw ppmvw



### Wednesday, July 21, 2010 Page 20 of 21

### 3190 Platte River Power Authority
7/23/2010
Location Stack Exit - OTM - 27/28 Average Run Number 1 2 3 Test Date 5/4/2010 5/5/2010 5/6/2010 Run Start Time 9:00:00 AM 8:01:00 AM 7:55:00 AM Run Finish Time 5:08:00 PM 3:43:00 PM 4:00:00 PM Net Traversing Points 12 12 12 Net Run Time, minutes 450 450 450 Nozzle Diameter, inches 0.172 0.155 0.155 0.161 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 1.0163 1.0163 1.0163 1 .016 Barometric Pressure, inches of Mercury 23.89 24.15 23. 94 23.993 Average Orifice Meter Differential, inches H2O 0.35 0 .35 0.36 0.353 Dry Gas Meter Volume Sampled, cubic feet 149.510 161. 190 164.770 158.490 Average Dry Gas Meter Temperature, °F 79.00 93.21 79.67 83.960 Dry Gas Meter Volume Sampled, dscf 118.976 126.335 131 .235 125.515 Total Moisture Liquid collected, g 379 429 452 420.000 Volume of Water Vapor, standard cubic feet 17.84 20.1 9 21.28 19.770 Moisture Content of Stack Gas, % 13.04 13.78 13.95 13.5 90 Moisture Saturation at Stack Gas Temperature, % 97.3 7 99.07 103.86 100.100 Dry Mole Fraction 0.8696 0.8622 0.8605 0.864 Carbon Dioxide, % 13.5 13.2 13.5 13.400 Oxygen, % 6.4 6.27 6.33 6.333 Carbon Monoxide & Nitrogen, % 80.1 80.53 80.17 80.267 Fuel Factor 1.07 1.11 1.08 Dry Molecular Weight, lb/lb-Mole 30.42 30.36 30.41 30.3 97 Wet Molecular weight, lb/lb-Mole 28.80 28.66 28.68 28.7 13 Flue Gas Static Pressure, inches of H2O -0.3 0.1 -0.2 -0.133 Absolute Flue Gas Pressure, inches of Mercury 23.87 24.16 23.93 23.987 Average Stack Gas Temperature, °F 199.58 201.00 202.83 201.137 Average Velocity Head, inches of H2O 0.553 0.971 0.972 0.832 Average Stack Gas Velocity, feet/second 52.31 69.14 69 .58 63.677 Stack Cross-Sectional Area, square feet 314.159 314.1 59 314.159 314.159 Dry Volumetric Flow Rate, dry scfm 547,598.5 724,779. 6 719,033.2 663,803.767 Actual Wet Volumetric Flue Gas Flow Rate, acfm 986,0 19.4 1,303,257.2 1,311,551.0 1,200,275.8 67 Percent Isokinetic of Sampling Rate, % 94.0 92.9 97.2 94.700 Percent Excess Air, % 43.4 41.8 42.7 42.633 F-Factor, dscfm/MMBtu @ %O2 9656 9642 9629 9,642.333 Round Duct Diameter, inches 240 240 240 Rectangular Duct Width, inches 0 0 0 Rectangular Duct Length, inches 0 0 0 Fw 0 0 0 0.000 Fc 0 0 0 0.000



### Wednesday, July 21, 2010 Page 21 of 21