### Your Project #: 902637 Site:NRG

ENERGY-VIENNA

PLANT

Attention: Mark

Carlson Eagle Mountain 8905 Autumn OaksDr. Rockford, MN USA 55373

Report Date: 2010/03/31 

## CERTIFICATE

OF ANALYSIS
MAXXAMJOB#: B026958 Received: 2010/03/03,20:30 SampleMatrix: Stack

Sampling Train #SamplesReceived: 4

Date Date Method Analyses Quantity Extracted Analyzed LaboratoryMethod Reference Dioxins/Furans in Air(Method 23) ( 1 ) 4 2010/03/12 2010/03/22 BRL SOP-00404 EPA1613Bmod(M23/23A) PCB Congeners in Air(1668A) 4 2010/03/12 2010/03/16 BRLSOP-00408, 409 EPA1668A(0010) mod

* RPDs calculated using rawdata. The rounding offinal results mayresultin the apparentdifference.

(1) This testwas performed in Maxxam Mississauga underMaxxam Burlington SCC Accreditation

U = Undetected at the limit ofquantitation. J = Estimated concentration between the EDL& RDL. B = BlankContamination. Q = One ormore qualitycontrol criteria failed.


### Encryption

Key

Please direct all questions regarding this Certificate ofAnalysis to yourProject Manager.
CLAYTON JOHNSON, Project Manager Email: Clayton.Johnson@maxxamanalytics.com Phone#(905) 817-5769

==================================================================== Maxxam has procedures in place to guard againstimproperuse ofthe electronicsignature and have the required "signatories", as persection 5.10.2 ofISO/IEC 17025:2005(E), signing the reports. ForService Group specificvalidation please referto the Validation Signature Page.

Total coverpages: 1

Page 1 of 19

### Eagle Mountain Maxxam Job #: B026958 Client Project #: 902637 Report Date: 2010/03/31 Projectname: NRG ENERGY-VIENNAPLANT



### RESULTS OF ANALYSES OF STACKSAMPLING TRAIN

Maxxam ID F G 4 3 8 3 Sampling Date 2010/02/24 TOXICEQUIVALENCY #of U n i t s REAGENT EDL RDL TEF (2005 WHO) TEQ(DL) I s o m e r s QC Batch BLANK-DF/PCB
PCBs 33'44'-TetraCB-(77) ng 0.0066 U 0.0066 0.20 0.00010 0.00000066 2098909 344'5-TetraCB-(81) ng 0.0036 U 0.0036 0.20 0.00030 0.0000011 2098909 233'44'-PentaCB-(105) ng 0.010 J 0.0038 0.20 0.000030 0.00000030 2098909 2344'5-PentaCB-(114) ng 0.0038 U 0.0038 0.20 0.000030 0.00000011 2098909 23'44'5-PentaCB-(118) ng 0.039 U 0.039 0.20 0.000030 0.0000012 2098909 23'44'5'-PentaCB-(123) ng 0.0038 U 0.0038 0.20 0.000030 0.00000011 2098909 33'44'5-PentaCB-(126) ng 0.0038 U 0.0038 0.20 0.10 0.00038 2098909 HexaCB-(156)+(157) ng 0.0070 U 0.0070 0.40 0.000030 0.00000021 2098909 23'44'55'-HexaCB-(167) ng 0.0039 U 0.0039 0.20 0.000030 0.00000012 2098909 33'44'55'-HexaCB-(169) ng 0.0041 U 0.0041 0.20 0.030 0.00012 2098909 233'44'55'-HeptaCB-(189) ng 0.0036 U 0.0036 0.20 0.000030 0.00000011 2098909 TOTAL TOXIC EQUIVALENCY ng 0.00050 SurrogateRecovery(%) C13-233'44'55'-HeptaCB-(189) % 118 2098909 C13-233'44'5-HexaCB-(156) % 136 2098909 C13-233'44'5'-HexaCB-(157) % 136 2098909 C13-233'44'-PentaCB-(105) % 146 2098909 C13-23'44'55'-HexaCB-(167) % 143 2098909 C13-2344'5-PentaCB-(114) % 145 2098909 C13-23'44'5-PentaCB-(118) % 147 2098909 C13-2'344'5-PentaCB-(123) % 149 2098909 C13-33'44'55'-HexaCB-(169) % 142 2098909 C13-33'44'5-PentaCB-(126) % 151 ( 1 ) 2098909 C13-33'44'-TetraCB-(77) % 138 2098909 C13-344'5-TetraCB-(81) % 136 2098909

RDL= Reportable Detection Limit EDL = Estimated Detection Limit QC Batch = QualityControl Batch TEF = ToxicEquivalencyFactor, TEQ = ToxicEquivalencyQuotient, The Total ToxicEquivalency(TEQ) value reported is the sum ofToxicEquivalentQuotients forthe congeners tested. WHO(2005): The 2005 World Health Organization, Human and Mammalian ToxicEquivalencyFactors forDioxins and Dioxin-like Compounds ( 1 ) RecoveryorRPD forthis parameteris outside control limits. The overall qualitycontrol forthis analysis meets acceptability criteria.

Page 2 of 19

### Eagle Mountain Maxxam Job #: B026958 Client Project #: 902637 Report Date: 2010/03/31 Projectname: NRG ENERGY-VIENNAPLANT



### RESULTS OF ANALYSES OF STACKSAMPLING TRAIN

Maxxam ID F G 4 3 8 4 Sampling Date 2010/02/23 TOXICEQUIVALENCY #of U n i t s TEST EDL RDL TEF (2005 WHO) TEQ(DL) I s o m e r s QC Batch 1-VIENNA 8-DF/PCB
PCBs 33'44'-TetraCB-(77) ng 0.017 U 0.017 0.20 0.00010 0.0000017 2098909 344'5-TetraCB-(81) ng 0.0026 U 0.0026 0.20 0.00030 0.00000078 2098909 233'44'-PentaCB-(105) ng 0.022 U 0.022 0.20 0.000030 0.00000066 2098909 2344'5-PentaCB-(114) ng 0.0058 U 0.0058 0.20 0.000030 0.00000017 2098909 23'44'5-PentaCB-(118) ng 0.077 J 0.0056 0.20 0.000030 0.0000023 2098909 23'44'5'-PentaCB-(123) ng 0.0059 U 0.0059 0.20 0.000030 0.00000018 2098909 33'44'5-PentaCB-(126) ng 0.0058 U 0.0058 0.20 0.10 0.00058 2098909 HexaCB-(156)+(157) ng 0.011 J 0.0031 0.40 0.000030 0.00000033 2098909 23'44'55'-HexaCB-(167) ng 0.0040 U 0.0040 0.20 0.000030 0.00000012 2098909 33'44'55'-HexaCB-(169) ng 0.0032 U 0.0032 0.20 0.030 0.000096 2098909 233'44'55'-HeptaCB-(189) ng 0.0032 U 0.0032 0.20 0.000030 0.000000096 2098909 TOTAL TOXIC EQUIVALENCY ng 0.00068 SurrogateRecovery(%) C13-233'44'55'-HeptaCB-(189) % 119 2098909 C13-233'44'5-HexaCB-(156) % 125 2098909 C13-233'44'5'-HexaCB-(157) % 125 2098909 C13-233'44'-PentaCB-(105) % 145 2098909 C13-23'44'55'-HexaCB-(167) % 132 2098909 C13-2344'5-PentaCB-(114) % 145 2098909 C13-23'44'5-PentaCB-(118) % 142 2098909 C13-2'344'5-PentaCB-(123) % 144 2098909 C13-33'44'55'-HexaCB-(169) % 123 2098909 C13-33'44'5-PentaCB-(126) % 148 2098909 C13-33'44'-TetraCB-(77) % 140 2098909 C13-344'5-TetraCB-(81) % 142 2098909

RDL = Reportable Detection Limit EDL = Estimated Detection Limit QC Batch = QualityControl Batch TEF = ToxicEquivalencyFactor, TEQ = ToxicEquivalencyQuotient, The Total ToxicEquivalency(TEQ) value reported is the sum ofToxicEquivalentQuotients forthe congeners tested. WHO(2005): The 2005 World Health Organization, Human and Mammalian ToxicEquivalencyFactors forDioxins and Dioxin-like Compounds

Page 3 of 19

### Eagle Mountain Maxxam Job #: B026958 Client Project #: 902637 Report Date: 2010/03/31 Projectname: NRG ENERGY-VIENNAPLANT



### RESULTS OF ANALYSES OF STACKSAMPLING TRAIN

Maxxam ID F G 4 3 8 5 Sampling Date 2010/02/23 TOXICEQUIVALENCY #of U n i t s TEST EDL RDL TEF (2005 WHO) TEQ(DL) I s o m e r s QC Batch 2-VIENNA 8-DF/PCB
PCBs 33'44'-TetraCB-(77) ng 0.016 J 0.0053 0.20 0.00010 0.0000016 2098909 344'5-TetraCB-(81) ng 0.0052 U 0.0052 0.20 0.00030 0.0000016 2098909 233'44'-PentaCB-(105) ng 0.038 J 0.0029 0.20 0.000030 0.0000011 2098909 2344'5-PentaCB-(114) ng 0.0046 J 0.0029 0.20 0.000030 0.00000014 2098909 23'44'5-PentaCB-(118) ng 0.11 J 0.0028 0.20 0.000030 0.0000033 2098909 23'44'5'-PentaCB-(123) ng 0.0029 U 0.0029 0.20 0.000030 0.000000087 2098909 33'44'5-PentaCB-(126) ng 0.0029 U 0.0029 0.20 0.10 0.00029 2098909 HexaCB-(156)+(157) ng 0.014 J 0.0051 0.40 0.000030 0.00000042 2098909 23'44'55'-HexaCB-(167) ng 0.0050 U 0.0050 0.20 0.000030 0.00000015 2098909 33'44'55'-HexaCB-(169) ng 0.0052 U 0.0052 0.20 0.030 0.00016 2098909 233'44'55'-HeptaCB-(189) ng 0.0049 U 0.0049 0.20 0.000030 0.00000015 2098909 TOTAL TOXIC EQUIVALENCY ng 0.00046 SurrogateRecovery(%) C13-233'44'55'-HeptaCB-(189) % 121 2098909 C13-233'44'5-HexaCB-(156) % 129 2098909 C13-233'44'5'-HexaCB-(157) % 129 2098909 C13-233'44'-PentaCB-(105) % 146 2098909 C13-23'44'55'-HexaCB-(167) % 134 2098909 C13-2344'5-PentaCB-(114) % 149 2098909 C13-23'44'5-PentaCB-(118) % 146 2098909 C13-2'344'5-PentaCB-(123) % 149 2098909 C13-33'44'55'-HexaCB-(169) % 123 2098909 C13-33'44'5-PentaCB-(126) % 149 2098909 C13-33'44'-TetraCB-(77) % 148 2098909 C13-344'5-TetraCB-(81) % 146 2098909

RDL = Reportable Detection Limit EDL = Estimated Detection Limit QC Batch = QualityControl Batch TEF = ToxicEquivalencyFactor, TEQ = ToxicEquivalencyQuotient, The Total ToxicEquivalency(TEQ) value reported is the sum ofToxicEquivalentQuotients forthe congeners tested. WHO(2005): The 2005 World Health Organization, Human and Mammalian ToxicEquivalencyFactors forDioxins and Dioxin-like Compounds

Page 4 of 19

### Eagle Mountain Maxxam Job #: B026958 Client Project #: 902637 Report Date: 2010/03/31 Projectname: NRG ENERGY-VIENNAPLANT



### RESULTS OF ANALYSES OF STACKSAMPLING TRAIN

Maxxam ID F G 4 3 8 6 Sampling Date 2010/02/24 TOXICEQUIVALENCY #of U n i t s TEST EDL RDL TEF (2005 WHO) TEQ(DL) I s o m e r s QC Batch 3-VIENNA 8-DF/PCB
PCBs 33'44'-TetraCB-(77) ng 0.015 J 0.0036 0.20 0.00010 0.0000015 2098909 344'5-TetraCB-(81) ng 0.0035 U 0.0035 0.20 0.00030 0.0000011 2098909 233'44'-PentaCB-(105) ng 0.038 J 0.0035 0.20 0.000030 0.0000011 2098909 2344'5-PentaCB-(114) ng 0.0040 U 0.0040 0.20 0.000030 0.00000012 2098909 23'44'5-PentaCB-(118) ng 0.11 J 0.0034 0.20 0.000030 0.0000033 2098909 23'44'5'-PentaCB-(123) ng 0.0035 U 0.0035 0.20 0.000030 0.00000011 2098909 33'44'5-PentaCB-(126) ng 0.0035 U 0.0035 0.20 0.10 0.00035 2098909 HexaCB-(156)+(157) ng 0.018 J 0.0031 0.40 0.000030 0.00000054 2098909 23'44'55'-HexaCB-(167) ng 0.0078 J 0.0030 0.20 0.000030 0.00000023 2098909 33'44'55'-HexaCB-(169) ng 0.0032 U 0.0032 0.20 0.030 0.000096 2098909 233'44'55'-HeptaCB-(189) ng 0.0031 U 0.0031 0.20 0.000030 0.000000093 2098909 TOTAL TOXIC EQUIVALENCY ng 0.00045 SurrogateRecovery(%) C13-233'44'55'-HeptaCB-(189) % 128 2098909 C13-233'44'5-HexaCB-(156) % 134 2098909 C13-233'44'5'-HexaCB-(157) % 134 2098909 C13-233'44'-PentaCB-(105) % 146 2098909 C13-23'44'55'-HexaCB-(167) % 138 2098909 C13-2344'5-PentaCB-(114) % 144 2098909 C13-23'44'5-PentaCB-(118) % 145 2098909 C13-2'344'5-PentaCB-(123) % 147 2098909 C13-33'44'55'-HexaCB-(169) % 129 2098909 C13-33'44'5-PentaCB-(126) % 151 ( 1 ) 2098909 C13-33'44'-TetraCB-(77) % 147 2098909 C13-344'5-TetraCB-(81) % 153( 1 ) 2098909

RDL = Reportable Detection Limit EDL = Estimated Detection Limit QC Batch = QualityControl Batch TEF = ToxicEquivalencyFactor, TEQ = ToxicEquivalencyQuotient, The Total ToxicEquivalency(TEQ) value reported is the sum ofToxicEquivalentQuotients forthe congeners tested. WHO(2005): The 2005 World Health Organization, Human and Mammalian ToxicEquivalencyFactors forDioxins and Dioxin-like Compounds ( 1 ) RecoveryorRPD forthis parameteris outside control limits. The overall qualitycontrol forthis analysis meets acceptability criteria.

Page 5 of 19

### Eagle Mountain Maxxam Job #: B026958 Client Project #: 902637 Report Date: 2010/03/31 Projectname: NRG ENERGY-VIENNAPLANT



### DIOXINS AND FURANS BY HRMS (STACKSAMPLING TRAIN)

Maxxam ID F G 4 3 8 3 Sampling Date 2010/02/24 TOXICEQUIVALENCY #of U n i t s REAGENT EDL RDL TEF (2005 WHO) TEQ(DL) I s o m e r s QC Batch BLANK-DF/PCB

Dioxins & Furans 2,3,7,8-Tetra CDD * pg 1.6 U 1.6 30 1.00 1.60 2101686 1,2,3,7,8-Penta CDD pg 1.7 U 1.7 30 1.00 1.70 2101686 1,2,3,4,7,8-HexaCDD pg 1.7 U 1.7 30 0.100 0.170 2101686 1,2,3,6,7,8-HexaCDD pg 1.7 U 1.7 30 0.100 0.170 2101686 1,2,3,7,8,9-HexaCDD pg 1.6 U 1.6 30 0.100 0.160 2101686 1,2,3,4,6,7,8-Hepta CDD pg 8.9 J 1.6 30 0.0100 0.0890 2101686 1,2,3,4,6,7,8,9-Octa CDD pg 20.9 J 3.5 300 0.000300 0.00627 2101686 Total Tetra CDD pg 1.6 U 1.6 30 2101686 Total Penta CDD pg 1.7 U 1.7 30 2101686 Total HexaCDD pg 2.4 J 1.7 30 2101686 Total HeptaCDD pg 17.4 J 1.6 30 2101686 2,3,7,8-Tetra CDF ** pg 4.3 J 1.7 30 0.100 0.430 2101686 1,2,3,7,8-Penta CDF pg 1.8 U 1.8 30 0.0300 0.0540 2101686 2,3,4,7,8-Penta CDF pg 3.5 U ( 1 ) 3.5 30 0.300 1.05 2101686 1,2,3,4,7,8-HexaCDF pg 1.6 J 1.6 30 0.100 0.160 2101686 1,2,3,6,7,8-HexaCDF pg 1.5 U 1.5 30 0.100 0.150 2101686 2,3,4,6,7,8-HexaCDF pg 3.6 J 1.9 30 0.100 0.360 2101686 1,2,3,7,8,9-HexaCDF pg 1.9 U 1.9 30 0.100 0.190 2101686 1,2,3,4,6,7,8-Hepta CDF pg 7.4 U ( 1 ) 7.4 30 0.0100 0.0740 2101686 1,2,3,4,7,8,9-Hepta CDF pg 2.0 U 2.0 30 0.0100 0.0200 2101686 1,2,3,4,6,7,8,9-Octa CDF pg 4.3 J 3.2 300 0.000300 0.00129 2101686 Total Tetra CDF pg 12.4 J 1.7 30 2101686 Total Penta CDF pg 5.7 J 1.8 30 2101686 Total HexaCDF pg 10.4 J 1.7 30 2101686 Total Hepta CDF pg 8.6 U ( 1 ) 8.6 30 2101686 ToxicEquivalency pg 1.7 U 1.7 N/A 2101686 TOTAL TOXIC EQUIVALENCY pg 6

. 3 8

RDL= Reportable Detection Limit EDL = Estimated Detection Limit QC Batch = QualityControl Batch

* CDD = ChloroDibenzo-p-Dioxin, ** CDF= ChloroDibenzo-p-Furan TEF = ToxicEquivalencyFactor, TEQ = ToxicEquivalencyQuotient, The Total ToxicEquivalency(TEQ) value reported is the sum ofToxicEquivalentQuotients forthe congeners tested. WHO(2005): The 2005 World Health Organization, Human and Mammalian ToxicEquivalencyFactors forDioxins and Dioxin-like Compounds ( 1 ) EMPC /

NDR - Peakdetected does notmeetratio criteria and has resulted in an elevated detection limit.

Page 6 of 19

### Eagle Mountain Maxxam Job #: B026958 Client Project #: 902637 Report Date: 2010/03/31 Projectname: NRG ENERGY-VIENNAPLANT



### DIOXINS AND FURANS BY HRMS (STACKSAMPLING TRAIN)

Maxxam ID F G 4 3 8 3 Sampling Date 2010/02/24 TOXICEQUIVALENCY #of U n i t s REAGENT EDL RDL TEF (2005 WHO) TEQ(DL) I s o m e r s QC Batch BLANK-DF/PCB SurrogateRecovery(%) C13-1234678HeptaCDD * % 89 2101686 C13-1234678 HeptaCDF** % 87 2101686 C13-123478HexaCDD % 88 2101686 C13-123478HexaCDF % 103 2101686 C13-1234789HeptaCDF % 93 2101686 C13-123678HexaCDD % 104 2101686 C13-123678HexaCDF % 88 2101686 C13-12378 PentaCDD % 97 2101686 C13-12378 PentaCDF % 87 2101686 C13-123789HexaCDF % 87 2101686 C13-23478 PentaCDF % 102 2101686 C13-2378TetraCDD % 70 2101686 C13-2378 TetraCDF % 68 2101686 C13-Octachlorodibenzo-p-Dioxin % 89 2101686 Cl37-2378TetraCDD % 96 2101686

RDL= Reportable Detection Limit EDL = Estimated Detection Limit QC Batch = QualityControl Batch

* CDD = ChloroDibenzo-p-Dioxin, ** CDF= ChloroDibenzo-p-Furan TEF = ToxicEquivalencyFactor, TEQ = ToxicEquivalencyQuotient, The Total ToxicEquivalency(TEQ) value reported is the sum ofToxicEquivalentQuotients forthe congeners tested. WHO(2005): The 2005 World Health Organization, Human and Mammalian ToxicEquivalencyFactors forDioxins and Dioxin-like Compounds

Page 7 of 19

### Eagle Mountain Maxxam Job #: B026958 Client Project #: 902637 Report Date: 2010/03/31 Projectname: NRG ENERGY-VIENNAPLANT



### DIOXINS AND FURANS BY HRMS (STACKSAMPLING TRAIN)

Maxxam ID F G 4 3 8 4 Sampling Date 2010/02/23 TOXICEQUIVALENCY #of U n i t s TEST EDL RDL TEF (2005 WHO) TEQ(DL) I s o m e r s QC Batch 1-VIENNA 8-DF/PCB

Dioxins & Furans 2,3,7,8-Tetra CDD * pg 1.7 U 1.7 30 1.00 1.70 2101686 1,2,3,7,8-Penta CDD pg 1.7 U 1.7 30 1.00 1.70 2101686 1,2,3,4,7,8-HexaCDD pg 1.7 U 1.7 30 0.100 0.170 2101686 1,2,3,6,7,8-HexaCDD pg 1.7 U 1.7 30 0.100 0.170 2101686 1,2,3,7,8,9-HexaCDD pg 1.6 U 1.6 30 0.100 0.160 2101686 1,2,3,4,6,7,8-Hepta CDD pg 6.8 J 1.6 30 0.0100 0.0680 2101686 1,2,3,4,6,7,8,9-Octa CDD pg 34.3 J 3.6 300 0.000300 0.0103 2101686 Total Tetra CDD pg 1.8 J 1.7 30 2101686 Total Penta CDD pg 1.7 U 1.7 30 2101686 Total HexaCDD pg 2.0 J 1.6 30 2101686 Total HeptaCDD pg 13.4 J 1.6 30 2101686 2,3,7,8-Tetra CDF ** pg 11.7 J 1.7 30 0.100 1.17 2101686 1,2,3,7,8-Penta CDF pg 1.8 U 1.8 30 0.0300 0.0540 2101686 2,3,4,7,8-Penta CDF pg 4.0 J 1.8 30 0.300 1.20 2101686 1,2,3,4,7,8-HexaCDF pg 2.3 J 1.7 30 0.100 0.230 2101686 1,2,3,6,7,8-HexaCDF pg 1.9 J 1.5 30 0.100 0.190 2101686 2,3,4,6,7,8-HexaCDF pg 3.0 J 1.9 30 0.100 0.300 2101686 1,2,3,7,8,9-HexaCDF pg 1.9 U 1.9 30 0.100 0.190 2101686 1,2,3,4,6,7,8-Hepta CDF pg 6.3 U ( 1 ) 6.3 30 0.0100 0.0630 2101686 1,2,3,4,7,8,9-Hepta CDF pg 2.1 U 2.1 30 0.0100 0.0210 2101686 1,2,3,4,6,7,8,9-Octa CDF pg 8.4 J 3.1 300 0.000300 0.00252 2101686 Total Tetra CDF pg 23.1 J 1.7 30 2101686 Total Penta CDF pg 17.4 J 1.8 30 2101686 Total HexaCDF pg 13.6 J 1.7 30 2101686 Total Hepta CDF pg 7.3 U ( 1 ) 7.3 30 2101686 ToxicEquivalency pg 4.0 1.7 N/A 2101686

RDL= Reportable Detection Limit EDL = Estimated Detection Limit QC Batch = QualityControl Batch

* CDD = ChloroDibenzo-p-Dioxin, ** CDF= ChloroDibenzo-p-Furan TEF = ToxicEquivalencyFactor, TEQ = ToxicEquivalencyQuotient, The Total ToxicEquivalency(TEQ) value reported is the sum ofToxicEquivalentQuotients forthe congeners tested. WHO(2005): The 2005 World Health Organization, Human and Mammalian ToxicEquivalencyFactors forDioxins and Dioxin-like Compounds ( 1 ) EMPC /

NDR - Peakdetected does notmeetratio criteria and has resulted in an elevated detection limit.

Page 8 of 19

### Eagle Mountain Maxxam Job #: B026958 Client Project #: 902637 Report Date: 2010/03/31 Projectname: NRG ENERGY-VIENNAPLANT



### DIOXINS AND FURANS BY HRMS (STACKSAMPLING TRAIN)

Maxxam ID F G 4 3 8 4 Sampling Date 2010/02/23 TOXICEQUIVALENCY #of U n i t s TEST EDL RDL TEF (2005 WHO) TEQ(DL) I s o m e r s QC Batch 1-VIENNA 8-DF/PCB
TOTAL TOXIC EQUIVALENCY pg 7

. 4 0 SurrogateRecovery(%) C13-1234678HeptaCDD * % 92 2101686 C13-1234678 HeptaCDF** % 87 2101686 C13-123478HexaCDD % 90 2101686 C13-123478HexaCDF % 107 2101686 C13-1234789HeptaCDF % 94 2101686 C13-123678HexaCDD % 96 2101686 C13-123678HexaCDF % 78 2101686 C13-12378 PentaCDD % 90 2101686 C13-12378 PentaCDF % 80 2101686 C13-123789HexaCDF % 85 2101686 C13-23478 PentaCDF % 103 2101686 C13-2378TetraCDD % 60 2101686 C13-2378 TetraCDF % 57 2101686 C13-Octachlorodibenzo-p-Dioxin % 94 2101686 Cl37-2378TetraCDD % 96 2101686

RDL= Reportable Detection Limit EDL = Estimated Detection Limit QC Batch = QualityControl Batch

* CDD = ChloroDibenzo-p-Dioxin, ** CDF= ChloroDibenzo-p-Furan TEF = ToxicEquivalencyFactor, TEQ = ToxicEquivalencyQuotient, The Total ToxicEquivalency(TEQ) value reported is the sum ofToxicEquivalentQuotients forthe congeners tested. WHO(2005): The 2005 World Health Organization, Human and Mammalian ToxicEquivalencyFactors forDioxins and Dioxin-like Compounds

Page 9 of 19

### Eagle Mountain Maxxam Job #: B026958 Client Project #: 902637 Report Date: 2010/03/31 Projectname: NRG ENERGY-VIENNAPLANT



### DIOXINS AND FURANS BY HRMS (STACKSAMPLING TRAIN)

Maxxam ID F G 4 3 8 5 Sampling Date 2010/02/23 TOXICEQUIVALENCY #of U n i t s TEST EDL RDL TEF (2005 WHO) TEQ(DL) I s o m e r s QC Batch 2-VIENNA 8-DF/PCB

Dioxins & Furans 2,3,7,8-Tetra CDD * pg 1.7 U 1.7 30 1.00 1.70 2101686 1,2,3,7,8-Penta CDD pg 1.7 U 1.7 30 1.00 1.70 2101686 1,2,3,4,7,8-HexaCDD pg 1.7 U 1.7 30 0.100 0.170 2101686 1,2,3,6,7,8-HexaCDD pg 1.7 U 1.7 30 0.100 0.170 2101686 1,2,3,7,8,9-HexaCDD pg 1.6 U 1.6 30 0.100 0.160 2101686 1,2,3,4,6,7,8-Hepta CDD pg 4.0 J 1.8 30 0.0100 0.0400 2101686 1,2,3,4,6,7,8,9-Octa CDD pg 13.6 J 3.1 300 0.000300 0.00408 2101686 Total Tetra CDD pg 2.3 J 1.7 30 2101686 Total Penta CDD pg 1.7 U 1.7 30 2101686 Total HexaCDD pg 2.8 U ( 1 ) 2.8 30 2101686 Total HeptaCDD pg 7.4 J 1.8 30 2101686 2,3,7,8-Tetra CDF ** pg 10.2 J 1.7 30 0.100 1.02 2101686 1,2,3,7,8-Penta CDF pg 1.7 U 1.7 30 0.0300 0.0510 2101686 2,3,4,7,8-Penta CDF pg 3.8 U ( 1 ) 3.8 30 0.300 1.14 2101686 1,2,3,4,7,8-HexaCDF pg 2.1 J 1.7 30 0.100 0.210 2101686 1,2,3,6,7,8-HexaCDF pg 1.5 U 1.5 30 0.100 0.150 2101686 2,3,4,6,7,8-HexaCDF pg 2.4 J 1.9 30 0.100 0.240 2101686 1,2,3,7,8,9-HexaCDF pg 1.9 U 1.9 30 0.100 0.190 2101686 1,2,3,4,6,7,8-Hepta CDF pg 3.8 U ( 1 ) 3.8 30 0.0100 0.0380 2101686 1,2,3,4,7,8,9-Hepta CDF pg 2.1 U 2.1 30 0.0100 0.0210 2101686 1,2,3,4,6,7,8,9-Octa CDF pg 5.1 J 3.1 300 0.000300 0.00153 2101686 Total Tetra CDF pg 35 1.7 30 2101686 Total Penta CDF pg 7.4 J 1.7 30 2101686 Total HexaCDF pg 8.1 J 1.7 30 2101686 Total Hepta CDF pg 4.4 U ( 1 ) 4.4 30 2101686 ToxicEquivalency pg 1.7 U 1.7 N/A 2101686

RDL= Reportable Detection Limit EDL = Estimated Detection Limit QC Batch = QualityControl Batch

* CDD = ChloroDibenzo-p-Dioxin, ** CDF= ChloroDibenzo-p-Furan TEF = ToxicEquivalencyFactor, TEQ = ToxicEquivalencyQuotient, The Total ToxicEquivalency(TEQ) value reported is the sum ofToxicEquivalentQuotients forthe congeners tested. WHO(2005): The 2005 World Health Organization, Human and Mammalian ToxicEquivalencyFactors forDioxins and Dioxin-like Compounds ( 1 ) EMPC /

NDR - Peakdetected does notmeetratio criteria and has resulted in an elevated detection limit.

Page 10 of 19

### Eagle Mountain Maxxam Job #: B026958 Client Project #: 902637 Report Date: 2010/03/31 Projectname: NRG ENERGY-VIENNAPLANT



### DIOXINS AND FURANS BY HRMS (STACKSAMPLING TRAIN)

Maxxam ID F G 4 3 8 5 Sampling Date 2010/02/23 TOXICEQUIVALENCY #of U n i t s TEST EDL RDL TEF (2005 WHO) TEQ(DL) I s o m e r s QC Batch 2-VIENNA 8-DF/PCB
TOTAL TOXIC EQUIVALENCY pg 7

. 0 1 SurrogateRecovery(%) C13-1234678HeptaCDD * % 92 2101686 C13-1234678 HeptaCDF** % 89 2101686 C13-123478HexaCDD % 86 2101686 C13-123478HexaCDF % 105 2101686 C13-1234789HeptaCDF % 92 2101686 C13-123678HexaCDD % 97 2101686 C13-123678HexaCDF % 78 2101686 C13-12378 PentaCDD % 85 2101686 C13-12378 PentaCDF % 77 2101686 C13-123789HexaCDF % 86 2101686 C13-23478 PentaCDF % 101 2101686 C13-2378TetraCDD % 58 2101686 C13-2378 TetraCDF % 55 2101686 C13-Octachlorodibenzo-p-Dioxin % 100 2101686 Cl37-2378TetraCDD % 94 2101686

RDL= Reportable Detection Limit EDL = Estimated Detection Limit QC Batch = QualityControl Batch

* CDD = ChloroDibenzo-p-Dioxin, ** CDF= ChloroDibenzo-p-Furan TEF = ToxicEquivalencyFactor, TEQ = ToxicEquivalencyQuotient, The Total ToxicEquivalency(TEQ) value reported is the sum ofToxicEquivalentQuotients forthe congeners tested. WHO(2005): The 2005 World Health Organization, Human and Mammalian ToxicEquivalencyFactors forDioxins and Dioxin-like Compounds

Page 11 of 19

### Eagle Mountain Maxxam Job #: B026958 Client Project #: 902637 Report Date: 2010/03/31 Projectname: NRG ENERGY-VIENNAPLANT



### DIOXINS AND FURANS BY HRMS (STACKSAMPLING TRAIN)

Maxxam ID F G 4 3 8 6 Sampling Date 2010/02/24 TOXICEQUIVALENCY #of U n i t s TEST EDL RDL TEF (2005 WHO) TEQ(DL) I s o m e r s QC Batch 3-VIENNA 8-DF/PCB

Dioxins & Furans 2,3,7,8-Tetra CDD * pg 1.6 U 1.6 30 1.00 1.60 2101686 1,2,3,7,8-Penta CDD pg 1.7 U 1.7 30 1.00 1.70 2101686 1,2,3,4,7,8-HexaCDD pg 1.8 U 1.8 30 0.100 0.180 2101686 1,2,3,6,7,8-HexaCDD pg 1.7 U 1.7 30 0.100 0.170 2101686 1,2,3,7,8,9-HexaCDD pg 1.6 U 1.6 30 0.100 0.160 2101686 1,2,3,4,6,7,8-Hepta CDD pg 6.8 J 1.6 30 0.0100 0.0680 2101686 1,2,3,4,6,7,8,9-Octa CDD pg 23U ( 1 ) 23 300 0.000300 0.00690 2101686 Total Tetra CDD pg 8.8 J 1.6 30 2101686 Total Penta CDD pg 1.9 J 1.7 30 2101686 Total HexaCDD pg 2.1 J 1.7 30 2101686 Total HeptaCDD pg 14.1 J 1.6 30 2101686 2,3,7,8-Tetra CDF ** pg 14.6 J 1.7 30 0.100 1.46 2101686 1,2,3,7,8-Penta CDF pg 3.6 J 1.7 30 0.0300 0.108 2101686 2,3,4,7,8-Penta CDF pg 5.8 J 1.6 30 0.300 1.74 2101686 1,2,3,4,7,8-HexaCDF pg 3.2 J 1.6 30 0.100 0.320 2101686 1,2,3,6,7,8-HexaCDF pg 2.9 J 1.5 30 0.100 0.290 2101686 2,3,4,6,7,8-HexaCDF pg 4.5 J 1.8 30 0.100 0.450 2101686 1,2,3,7,8,9-HexaCDF pg 1.9 U 1.9 30 0.100 0.190 2101686 1,2,3,4,6,7,8-Hepta CDF pg 9.4 U ( 1 ) 9.4 30 0.0100 0.0940 2101686 1,2,3,4,7,8,9-Hepta CDF pg 2.0 U 2.0 30 0.0100 0.0200 2101686 1,2,3,4,6,7,8,9-Octa CDF pg 6.5 J 3.3 300 0.000300 0.00195 2101686 Total Tetra CDF pg 67 1.7 30 2101686 Total Penta CDF pg 44 1.7 30 2101686 Total HexaCDF pg 23.6 J 1.7 30 2101686 Total Hepta CDF pg 11 U ( 1 ) 11 30 2101686 ToxicEquivalency pg 5.7 1.7 N/A 2101686

RDL= Reportable Detection Limit EDL = Estimated Detection Limit QC Batch = QualityControl Batch

* CDD = ChloroDibenzo-p-Dioxin, ** CDF= ChloroDibenzo-p-Furan TEF = ToxicEquivalencyFactor, TEQ = ToxicEquivalencyQuotient, The Total ToxicEquivalency(TEQ) value reported is the sum ofToxicEquivalentQuotients forthe congeners tested. WHO(2005): The 2005 World Health Organization, Human and Mammalian ToxicEquivalencyFactors forDioxins and Dioxin-like Compounds ( 1 ) EMPC /

NDR - Peakdetected does notmeetratio criteria and has resulted in an elevated detection limit.

Page 12 of 19

### Eagle Mountain Maxxam Job #: B026958 Client Project #: 902637 Report Date: 2010/03/31 Projectname: NRG ENERGY-VIENNAPLANT



### DIOXINS AND FURANS BY HRMS (STACKSAMPLING TRAIN)

Maxxam ID F G 4 3 8 6 Sampling Date 2010/02/24 TOXICEQUIVALENCY #of U n i t s TEST EDL RDL TEF (2005 WHO) TEQ(DL) I s o m e r s QC Batch 3-VIENNA 8-DF/PCB
TOTAL TOXIC EQUIVALENCY pg 8

. 5 6 SurrogateRecovery(%) C13-1234678HeptaCDD * % 91 2101686 C13-1234678 HeptaCDF** % 87 2101686 C13-123478HexaCDD % 90 2101686 C13-123478HexaCDF % 105 2101686 C13-1234789HeptaCDF % 92 2101686 C13-123678HexaCDD % 95 2101686 C13-123678HexaCDF % 79 2101686 C13-12378 PentaCDD % 88 2101686 C13-12378 PentaCDF % 79 2101686 C13-123789HexaCDF % 83 2101686 C13-23478 PentaCDF % 107 2101686 C13-2378TetraCDD % 62 2101686 C13-2378 TetraCDF % 58 2101686 C13-Octachlorodibenzo-p-Dioxin % 95 2101686 Cl37-2378TetraCDD % 95 2101686

RDL= Reportable Detection Limit EDL = Estimated Detection Limit QC Batch = QualityControl Batch

* CDD = ChloroDibenzo-p-Dioxin, ** CDF= ChloroDibenzo-p-Furan TEF = ToxicEquivalencyFactor, TEQ = ToxicEquivalencyQuotient, The Total ToxicEquivalency(TEQ) value reported is the sum ofToxicEquivalentQuotients forthe congeners tested. WHO(2005): The 2005 World Health Organization, Human and Mammalian ToxicEquivalencyFactors forDioxins and Dioxin-like Compounds

Page 13 of 19

### Eagle Mountain Maxxam Job #: B026958 Client Project #: 902637 Report Date: 2010/03/31 Projectname: NRG ENERGY-VIENNAPLANT



### Test Summary

Maxxam ID FG4383 Collected 2010/02/24 Sample ID REAGENT BLANK-DF/PCB Shipped Matrix Stack Sampling Train Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Dioxins/Furans in Air(Method 23) HRMS/MS 2101686 2010/03/12 2010/03/22 KKS PCB Congeners in Air(1668A) HRMS/MSEC 2098909 2010/03/12 2010/03/16 BY

Maxxam ID FG4384 Collected 2010/02/23 Sample ID TEST 1-VIENNA 8-DF/PCB Shipped Matrix Stack Sampling Train Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Dioxins/Furans in Air(Method 23) HRMS/MS 2101686 2010/03/12 2010/03/22 KKS PCB Congeners in Air(1668A) HRMS/MSEC 2098909 2010/03/12 2010/03/16 BY

Maxxam ID FG4385 Collected 2010/02/23 Sample ID TEST 2-VIENNA 8-DF/PCB Shipped Matrix Stack Sampling Train Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Dioxins/Furans in Air(Method 23) HRMS/MS 2101686 2010/03/12 2010/03/22 KKS PCB Congeners in Air(1668A) HRMS/MSEC 2098909 2010/03/12 2010/03/16 BY

Maxxam ID FG4386 Collected 2010/02/24 Sample ID TEST 3-VIENNA 8-DF/PCB Shipped Matrix Stack Sampling Train Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Dioxins/Furans in Air(Method 23) HRMS/MS 2101686 2010/03/12 2010/03/22 KKS PCB Congeners in Air(1668A) HRMS/MSEC 2098909 2010/03/12 2010/03/16 BY

Page 14 of 19

### Eagle Mountain Maxxam Job #: B026958 Client Project #: 902637 Report Date: 2010/03/31 Projectname: NRG ENERGY-VIENNAPLANT

RESULTSOFANALYSESOFSTACK SAMPLING TRAIN
PCB Congeners in Air(1668A): Some internal standard recoveries are high, possiblydue to matrixeffects.

Results relateonlytotheitems tested.

Page 15 of 19

### Eagle Mountain Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG ENERGY-VIENNAPLANT 

### Quality AssuranceReport Maxxam Job Number: GB026958
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2098909 BY Spiked Blank C13-233'44'55'-HeptaCB-(189) 2010/03/16 133 % 20 - 150

Spiked BlankDUP C13-233'44'55'-HeptaCB-(189) 2010/03/16 126 % 20 - 150 Spiked Blank C13-233'44'5-HexaCB-(156) 2010/03/16 141 % 20 - 150 Spiked BlankDUP C13-233'44'5-HexaCB-(156) 2010/03/16 136 % 20 - 150 Spiked Blank C13-233'44'5'-HexaCB-(157) 2010/03/16 141 % 20 - 150 Spiked BlankDUP C13-233'44'5'-HexaCB-(157) 2010/03/16 136 % 20 - 150 Spiked Blank C13-233'44'-PentaCB-(105) 2010/03/16 153( 1 ) % 20 - 150 Spiked BlankDUP C13-233'44'-PentaCB-(105) 2010/03/16 144 % 20 - 150 Spiked Blank C13-23'44'55'-HexaCB-(167) 2010/03/16 137 % 20 - 150 Spiked BlankDUP C13-23'44'55'-HexaCB-(167) 2010/03/16 139 % 20 - 150 Spiked Blank C13-2344'5-PentaCB-(114) 2010/03/16 144 % 20 - 150 Spiked BlankDUP C13-2344'5-PentaCB-(114) 2010/03/16 136 % 20 - 150 Spiked Blank C13-23'44'5-PentaCB-(118) 2010/03/16 142 % 20 - 150 Spiked BlankDUP C13-23'44'5-PentaCB-(118) 2010/03/16 139 % 20 - 150 Spiked Blank C13-2'344'5-PentaCB-(123) 2010/03/16 150 % 20 - 150 Spiked BlankDUP C13-2'344'5-PentaCB-(123) 2010/03/16 137 % 20 - 150 Spiked Blank C13-33'44'55'-HexaCB-(169) 2010/03/16 140 % 20 - 150 Spiked BlankDUP C13-33'44'55'-HexaCB-(169) 2010/03/16 139 % 20 - 150 Spiked Blank C13-33'44'5-PentaCB-(126) 2010/03/16 154( 1 ) % 20 - 150 Spiked BlankDUP C13-33'44'5-PentaCB-(126) 2010/03/16 151 ( 1 ) % 20 - 150 Spiked Blank C13-33'44'-TetraCB-(77) 2010/03/16 142 % 20 - 150 Spiked BlankDUP C13-33'44'-TetraCB-(77) 2010/03/16 130 % 20 - 150 Spiked Blank C13-344'5-TetraCB-(81) 2010/03/16 144 % 20 - 150 Spiked BlankDUP C13-344'5-TetraCB-(81) 2010/03/16 120 % 20 - 150 Spiked Blank 33'44'-TetraCB-(77) 2010/03/16 111 % N/A Spiked BlankDUP 33'44'-TetraCB-(77) 2010/03/16 115 % N/A RPD 33'44'-TetraCB-(77) 2010/03/16 3.5 % 20 Spiked Blank 344'5-TetraCB-(81) 2010/03/16 112 % N/A Spiked BlankDUP 344'5-TetraCB-(81) 2010/03/16 113 % N/A RPD 344'5-TetraCB-(81) 2010/03/16 0.9 % 20 Spiked Blank 233'44'-PentaCB-(105) 2010/03/16 105 % N/A Spiked BlankDUP 233'44'-PentaCB-(105) 2010/03/16 109 % N/A RPD 233'44'-PentaCB-(105) 2010/03/16 3.7 % 20 Spiked Blank 2344'5-PentaCB-(114) 2010/03/16 105 % N/A Spiked BlankDUP 2344'5-PentaCB-(114) 2010/03/16 111 % N/A RPD 2344'5-PentaCB-(114) 2010/03/16 5.6 % 20 Spiked Blank 23'44'5-PentaCB-(118) 2010/03/16 109 % N/A Spiked BlankDUP 23'44'5-PentaCB-(118) 2010/03/16 110 % N/A RPD 23'44'5-PentaCB-(118) 2010/03/16 0.9 % 20 Spiked Blank 23'44'5'-PentaCB-(123) 2010/03/16 109 % N/A Spiked BlankDUP 23'44'5'-PentaCB-(123) 2010/03/16 111 % N/A RPD 23'44'5'-PentaCB-(123) 2010/03/16 1.8 % 20 Spiked Blank 33'44'5-PentaCB-(126) 2010/03/16 111 % N/A Spiked BlankDUP 33'44'5-PentaCB-(126) 2010/03/16 112 % N/A RPD 33'44'5-PentaCB-(126) 2010/03/16 0.9 % 20 Spiked Blank HexaCB-(156)+(157) 2010/03/16 107 % N/A Spiked BlankDUP HexaCB-(156)+(157) 2010/03/16 111 % N/A RPD HexaCB-(156)+(157) 2010/03/16 3.7 % 20 Spiked Blank 23'44'55'-HexaCB-(167) 2010/03/16 106 % N/A Spiked BlankDUP 23'44'55'-HexaCB-(167) 2010/03/16 110 % N/A RPD 23'44'55'-HexaCB-(167) 2010/03/16 3.7 % 20 Spiked Blank 33'44'55'-HexaCB-(169) 2010/03/16 108 % N/A Spiked BlankDUP 33'44'55'-HexaCB-(169) 2010/03/16 111 % N/A RPD 33'44'55'-HexaCB-(169) 2010/03/16 2.7 % 20 Spiked Blank 233'44'55'-HeptaCB-(189) 2010/03/16 96 % N/A

Page 16 of 19

### Eagle Mountain Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG ENERGY-VIENNAPLANT 

### Quality AssuranceReport

(Continued) Maxxam Job Number: GB026958
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2098909 BY Spiked BlankDUP 233'44'55'-HeptaCB-(189) 2010/03/16 106 % N/A

RPD 233'44'55'-HeptaCB-(189) 2010/03/16 9.9 % N/A Method Blank C13-233'44'55'-HeptaCB-(189) 2010/03/16 130 % 20 - 150

C13-233'44'5-HexaCB-(156) 2010/03/16 139 % 20 - 150 C13-233'44'5'-HexaCB-(157) 2010/03/16 139 % 20 - 150 C13-233'44'-PentaCB-(105) 2010/03/16 146 % 20 - 150 C13-23'44'55'-HexaCB-(167) 2010/03/16 142 % 20 - 150 C13-2344'5-PentaCB-(114) 2010/03/16 142 % 20 - 150 C13-23'44'5-PentaCB-(118) 2010/03/16 148 % 20 - 150 C13-2'344'5-PentaCB-(123) 2010/03/16 148 % 20 - 150 C13-33'44'55'-HexaCB-(169) 2010/03/16 134 % 20 - 150 C13-33'44'5-PentaCB-(126) 2010/03/16 149 % 20 - 150 C13-33'44'-TetraCB-(77) 2010/03/16 134 % 20 - 150 C13-344'5-TetraCB-(81) 2010/03/16 133 % 20 - 150 33'44'-TetraCB-(77) 2010/03/16 0.0062 U, EDL=0.0062 ng 344'5-TetraCB-(81) 2010/03/16 0.0061 U, EDL=0.0061 ng 233'44'-PentaCB-(105) 2010/03/16 0.0043 J, EDL=0.0040 ng 2344'5-PentaCB-(114) 2010/03/16 0.0040 U, EDL=0.0040 ng 23'44'5-PentaCB-(118) 2010/03/16 0.015 U, EDL=0.015 ng 23'44'5'-PentaCB-(123) 2010/03/16 0.0041 U, EDL=0.0041 ng 33'44'5-PentaCB-(126) 2010/03/16 0.0040 U, EDL=0.0040 ng HexaCB-(156)+(157) 2010/03/16 0.0039 J, EDL=0.0026 ng 23'44'55'-HexaCB-(167) 2010/03/16 0.0028 U, EDL=0.0028 ng 33'44'55'-HexaCB-(169) 2010/03/16 0.0026 U, EDL=0.0026 ng 233'44'55'-HeptaCB-(189) 2010/03/16 0.0025 U, EDL=0.0025 ng 2101686 KKS Spiked Blank C13-1234678HeptaCDD 2010/03/21 91 % 25 - 130

Spiked BlankDUP C13-1234678HeptaCDD 2010/03/21 87 % 25 - 130 Spiked Blank C13-1234678HeptaCDF 2010/03/21 86 % 25 - 130 Spiked BlankDUP C13-1234678HeptaCDF 2010/03/21 83 % 25 - 130 Spiked Blank C13-123678HexaCDD 2010/03/21 92 % 40 - 130 Spiked BlankDUP C13-123678HexaCDD 2010/03/21 90 % 40 - 130 Spiked Blank C13-123678HexaCDF 2010/03/21 73 % 40 - 130 Spiked BlankDUP C13-123678HexaCDF 2010/03/21 71 % 40 - 130 Spiked Blank C13-12378 PentaCDD 2010/03/21 87 % 40 - 130 Spiked BlankDUP C13-12378 PentaCDD 2010/03/21 87 % 40 - 130 Spiked Blank C13-12378 PentaCDF 2010/03/21 83 % 40 - 130 Spiked BlankDUP C13-12378 PentaCDF 2010/03/21 79 % 40 - 130 Spiked Blank C13-123789HexaCDF 2010/03/21 91 % 40 - 130 Spiked BlankDUP C13-123789HexaCDF 2010/03/21 85 % 40 - 130 Spiked Blank C13-2378TetraCDD 2010/03/21 61 % 40 - 130 Spiked BlankDUP C13-2378TetraCDD 2010/03/21 57 % 40 - 130 Spiked Blank C13-2378 TetraCDF 2010/03/21 68 % 40 - 130 Spiked BlankDUP C13-2378 TetraCDF 2010/03/21 59 % 40 - 130 Spiked Blank C13-Octachlorodibenzo-p-Dioxin 2010/03/21 102 % 25 - 130 Spiked BlankDUP C13-Octachlorodibenzo-p-Dioxin 2010/03/21 97 % 25 - 130 Spiked Blank 2,3,7,8-Tetra CDD 2010/03/21 98 % 80 - 140 Spiked BlankDUP 2,3,7,8-Tetra CDD 2010/03/21 91 % 80 - 140 RPD 2,3,7,8-Tetra CDD 2010/03/21 NC % 20 Spiked Blank 1,2,3,7,8-Penta CDD 2010/03/21 95 % 80 - 140 Spiked BlankDUP 1,2,3,7,8-Penta CDD 2010/03/21 93 % 80 - 140 RPD 1,2,3,7,8-Penta CDD 2010/03/21 NC % 20 Spiked Blank 1,2,3,4,7,8-HexaCDD 2010/03/21 86 % 80 - 140 Spiked BlankDUP 1,2,3,4,7,8-HexaCDD 2010/03/21 83 % 80 - 140 RPD 1,2,3,4,7,8-HexaCDD 2010/03/21 NC % 20 Spiked Blank 1,2,3,6,7,8-HexaCDD 2010/03/21 85 % 80 - 140

Page 17 of 19

### Eagle Mountain Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG ENERGY-VIENNAPLANT 

### Quality AssuranceReport

(Continued) Maxxam Job Number: GB026958
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2101686 KKS Spiked BlankDUP 1,2,3,6,7,8-HexaCDD 2010/03/21 83 % 80 - 140

RPD 1,2,3,6,7,8-HexaCDD 2010/03/21 NC % 20 Spiked Blank 1,2,3,7,8,9-HexaCDD 2010/03/21 91 % 80 - 140 Spiked BlankDUP 1,2,3,7,8,9-HexaCDD 2010/03/21 85 % 80 - 140 RPD 1,2,3,7,8,9-HexaCDD 2010/03/21 NC % 20 Spiked Blank 1,2,3,4,6,7,8-Hepta CDD 2010/03/21 88 % 80 - 140 Spiked BlankDUP 1,2,3,4,6,7,8-Hepta CDD 2010/03/21 87 % 80 - 140 RPD 1,2,3,4,6,7,8-Hepta CDD 2010/03/21 NC % 20 Spiked Blank 1,2,3,4,6,7,8,9-Octa CDD 2010/03/21 93 % 80 - 140 Spiked BlankDUP 1,2,3,4,6,7,8,9-Octa CDD 2010/03/21 90 % 80 - 140 RPD 1,2,3,4,6,7,8,9-Octa CDD 2010/03/21 NC % 20 Spiked Blank 2,3,7,8-Tetra CDF 2010/03/21 98 % 80 - 140 Spiked BlankDUP 2,3,7,8-Tetra CDF 2010/03/21 91 % 80 - 140 RPD 2,3,7,8-Tetra CDF 2010/03/21 NC % 20 Spiked Blank 1,2,3,7,8-Penta CDF 2010/03/21 98 % 80 - 140 Spiked BlankDUP 1,2,3,7,8-Penta CDF 2010/03/21 94 % 80 - 140 RPD 1,2,3,7,8-Penta CDF 2010/03/21 NC % 20 Spiked Blank 2,3,4,7,8-Penta CDF 2010/03/21 96 % 80 - 140 Spiked BlankDUP 2,3,4,7,8-Penta CDF 2010/03/21 97 % 80 - 140 RPD 2,3,4,7,8-Penta CDF 2010/03/21 NC % 20 Spiked Blank 1,2,3,4,7,8-HexaCDF 2010/03/21 98 % 80 - 140 Spiked BlankDUP 1,2,3,4,7,8-HexaCDF 2010/03/21 97 % 80 - 140 RPD 1,2,3,4,7,8-HexaCDF 2010/03/21 NC % 20 Spiked Blank 1,2,3,6,7,8-HexaCDF 2010/03/21 96 % 80 - 140 Spiked BlankDUP 1,2,3,6,7,8-HexaCDF 2010/03/21 96 % 80 - 140 RPD 1,2,3,6,7,8-HexaCDF 2010/03/21 NC % 20 Spiked Blank 2,3,4,6,7,8-HexaCDF 2010/03/21 112 % 80 - 140 Spiked BlankDUP 2,3,4,6,7,8-HexaCDF 2010/03/21 108 % 80 - 140 RPD 2,3,4,6,7,8-HexaCDF 2010/03/21 NC % 20 Spiked Blank 1,2,3,7,8,9-HexaCDF 2010/03/21 116 % 80 - 140 Spiked BlankDUP 1,2,3,7,8,9-HexaCDF 2010/03/21 105 % 80 - 140 RPD 1,2,3,7,8,9-HexaCDF 2010/03/21 NC % 20 Spiked Blank 1,2,3,4,6,7,8-Hepta CDF 2010/03/21 91 % 80 - 140 Spiked BlankDUP 1,2,3,4,6,7,8-Hepta CDF 2010/03/21 90 % 80 - 140 RPD 1,2,3,4,6,7,8-Hepta CDF 2010/03/21 NC % 20 Spiked Blank 1,2,3,4,7,8,9-Hepta CDF 2010/03/21 94 % 80 - 140 Spiked BlankDUP 1,2,3,4,7,8,9-Hepta CDF 2010/03/21 89 % 80 - 140 RPD 1,2,3,4,7,8,9-Hepta CDF 2010/03/21 NC % 20 Spiked Blank 1,2,3,4,6,7,8,9-Octa CDF 2010/03/21 84 % 80 - 140 Spiked BlankDUP 1,2,3,4,6,7,8,9-Octa CDF 2010/03/21 82 % 80 - 140 RPD 1,2,3,4,6,7,8,9-Octa CDF 2010/03/21 NC % 20 Method Blank C13-1234678HeptaCDD 2010/03/21 90 % 25 - 130

C13-1234678HeptaCDF 2010/03/21 87 % 25 - 130 C13-123678HexaCDD 2010/03/21 95 % 40 - 130 C13-123678HexaCDF 2010/03/21 75 % 40 - 130 C13-12378 PentaCDD 2010/03/21 86 % 40 - 130 C13-12378 PentaCDF 2010/03/21 78 % 40 - 130 C13-123789HexaCDF 2010/03/21 82 % 40 - 130 C13-2378TetraCDD 2010/03/21 57 % 40 - 130 C13-2378 TetraCDF 2010/03/21 59 % 40 - 130 C13-Octachlorodibenzo-p-Dioxin 2010/03/21 98 % 25 - 130 2,3,7,8-Tetra CDD 2010/03/21 1.8 U, EDL=1.8 pg 1,2,3,7,8-Penta CDD 2010/03/21 1.6 U, EDL=1.6 pg 1,2,3,4,7,8-HexaCDD 2010/03/21 1.8 U, EDL=1.8 pg 1,2,3,6,7,8-HexaCDD 2010/03/21 1.8 U, EDL=1.8 pg

Page 18 of 19

### Eagle Mountain Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG ENERGY-VIENNAPLANT 

### Quality AssuranceReport

(Continued) Maxxam Job Number: GB026958
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2101686 KKS Method Blank 1,2,3,7,8,9-HexaCDD 2010/03/21 1.7 U, EDL=1.7 pg 1,2,3,4,6,7,8-Hepta CDD 2010/03/21 1.7 U, EDL=1.7 pg 1,2,3,4,6,7,8,9-Octa CDD 2010/03/21 3.3 U, EDL=3.3 pg Total Tetra CDD 2010/03/21 1.8 U, EDL=1.8 pg Total Penta CDD 2010/03/21 1.6 U, EDL=1.6 pg Total HexaCDD 2010/03/21 1.8 U, EDL=1.8 pg Total HeptaCDD 2010/03/21 1.7 U, EDL=1.7 pg 2,3,7,8-Tetra CDF 2010/03/21 2.3 J, EDL=1.6 pg 1,2,3,7,8-Penta CDF 2010/03/21 1.8 U, EDL=1.8 pg 2,3,4,7,8-Penta CDF 2010/03/21 1.8 U, EDL=1.8 ( 2 ) pg 1,2,3,4,7,8-HexaCDF 2010/03/21 1.7 U, EDL=1.7 pg 1,2,3,6,7,8-HexaCDF 2010/03/21 1.5 U, EDL=1.5 pg 2,3,4,6,7,8-HexaCDF 2010/03/21 1.9 U, EDL=1.9 pg 1,2,3,7,8,9-HexaCDF 2010/03/21 1.9 U, EDL=1.9 pg 1,2,3,4,6,7,8-Hepta CDF 2010/03/21 1.5 U, EDL=1.5 pg 1,2,3,4,7,8,9-Hepta CDF 2010/03/21 2.0 U, EDL=2.0 pg 1,2,3,4,6,7,8,9-Octa CDF 2010/03/21 3.4 U, EDL=3.4 pg Total Tetra CDF 2010/03/21 7.0 J, EDL=1.6 pg Total Penta CDF 2010/03/21 1.8 U, EDL=1.8 ( 2 ) pg Total HexaCDF 2010/03/21 1.7 U, EDL=1.7 pg Total Hepta CDF 2010/03/21 1.7 U, EDL=1.7 pg ToxicEquivalency 2010/03/21 1.6 U, EDL=1.6 pg Duplicate: Paired analysis ofa separate portion ofthe same sample. Used to evaluate the variance in the measurement. Spiked Blank: Ablankmatrixto which aknown amountofthe analyte has been added. Used to evaluate analyte recovery. Method Blank: Ablankmatrixcontaining all reagents used in the analytical procedure. Used to identifylaboratorycontamination. Surrogate: Apure orisotopicallylabeled compound whose behaviormirrors the analytes ofinterest. Used to evaluate extraction efficiency. NC (RPD): The RPD was notcalculated. The level ofanalyte detected in the parentsample and its duplicate was notsufficientlysignificantto permita reliable calculation. ( 1 ) RecoveryorRPD forthis parameteris outside control limits. The overall qualitycontrol forthis analysis meets acceptabilitycriteria. ( 2 ) EMPC /

NDR - Peakdetected does notmeetratio criteria and has resulted in an elevated detection limit.

Page 19 of 19

### Your Project #: 902637 Site:NRGENERGY

INC.VIENNA

PLANT Your C.O.C. #: N/A

Attention: Mark

Carlson EagleMountainScientific Inc 321 Perry

Hwy Harmony, PA USA 16037

Report Date: 2010/03/25 

## CERTIFICATE

OF ANALYSIS
MAXXAMJOB#: B029231 Received: 2010/03/11,11:45 SampleMatrix: Stack

Sampling Train #SamplesReceived: 4

Date Date Method Analyses Quantity Extracted Analyzed LaboratoryMethod Reference Metals B.H. in H2O2/HNO3 Imp.(6020) ( 1 ) 4 2010/03/23 2010/03/24 BRLSOP-00103 / BRL EPA 6020 /M29 SOP-00102 Metals F.H. in Filter+ Rinses (6020) ( 1 ) 4 2010/03/23 2010/03/24 BRL SOP-00103/BRL EPA 6020 /M29 SOP-00102

(1) This testwas performed in Maxxam Mississauga underMaxxam Burlington SCC Accreditation



### Encryption

Key

Please direct all questions regarding this Certificate ofAnalysis to yourProject Manager.
CLAYTON JOHNSON, Project Manager Email: Clayton.Johnson@maxxamanalytics.com Phone#(905) 817-5769

==================================================================== Maxxam has procedures in place to guard againstimproperuse ofthe electronicsignature and have the required "signatories", as persection 5.10.2 ofISO/IEC 17025:2005(E), signing the reports. ForService Group specificvalidation please referto the Validation Signature Page.

Total coverpages: 1

Page 1 of 8

### Eagle Mountain Scientific Inc Maxxam Job #: B029231 Client Project #: 902637 Report Date: 2010/03/25 Projectname: NRG ENERGYINC. VIENNAPLANT



### ELEMENTS BY ICP/MS (STACKSAMPLING TRAIN)

Maxxam ID F H 5 4 5 7 F

H 5 4 5 8 F

H 5 4 5 9 F

H 5 4 6 0 Sampling Date 2010/02/23 2010/02/23 2010/02/23 2010/02/23 COC Number N/A N/A N/A N/A U n i t s BLANK-M29 RDL RUN 1-M29 RUN 2-M29 RUN 3-M29 RDL QC Batch

Metals BackHalf Antimony (Sb) ug <0.20 0.20 <4.0 <4.0 <4.0 4.0 2106659 Front HalfAntimony(Sb) ug <0.40 0.40 194 181 184 2.0 2106560 BackHalf Arsenic (As) ug <0.20 0.20 <4.0 <4.0 <4.0 4.0 2106659 Front Half Arsenic(As) ug <0.40 0.40 21.5 16.3 17.1 2.0 2106560 BackHalf Beryllium (Be) ug <0.050 0.050 <1.0 <1.0 <1.0 1.0 2106659 Front HalfBeryllium (Be) ug <0.10 0.10 1.25 1.23 1.28 0.50 2106560 BackHalf Cadmium (Cd) ug <0.050 0.050 <1.0 <1.0 <1.0 1.0 2106659 Front HalfCadmium (Cd) ug <0.10 0.10 <0.50 <0.50 <0.50 0.50 2106560 BackHalf Chromium (Cr) ug 0.21 0.15 74.7 <3.0 6.1 3.0 2106659 Front HalfChromium (Cr) ug 1.22 0.30 14.9 8.9 42.2 1.5 2106560 BackHalfCobalt(Co) ug <0.050 0.050 5.0 <1.0 <1.0 1.0 2106659 FrontHalfCobalt(Co) ug <0.10 0.10 116 93.6 108 0.50 2106560 BackHalfLead (Pb) ug 0.21 0.10 <2.0 <2.0 <2.0 2.0 2106659 FrontHalfLead (Pb) ug 0.22 0.20 38.3 33.8 37.0 1.0 2106560 BackHalfManganese (Mn) ug <0.25 0.25 26.1 6.3 <5.0 5.0 2106659 FrontHalfManganese (Mn) ug 0.86 0.75 138 107 163 3.8 2106560 BackHalf Nickel (Ni) ug <0.25 0.25 138 <5.0 <5.0 5.0 2106659 FrontHalfNickel (Ni) ug 0.74 0.50 5170 4460 5030 2.5 2106560 BackHalf Selenium (Se) ug <0.50 0.50 <10 12 13 10 2106659 Front HalfSelenium (Se) ug <1.0 1.0 6.1 <5.0 <5.0 5.0 2106560
N/A= Not Applicable RDL= Reportable Detection Limit QC Batch = QualityControl Batch

Page 2 of 8

### Eagle Mountain Scientific Inc Maxxam Job #: B029231 Client Project #: 902637 Report Date: 2010/03/25 Projectname: NRG ENERGYINC. VIENNAPLANT



### Test Summary

Maxxam ID FH5457 Collected 2010/02/23 Sample ID BLANK-M29 Shipped Matrix Stack Sampling Train Received 2010/03/11
TestDescription Instrumentation Batch Extracted Analyzed Analyst Metals B.H. in H2O2/HNO3 Imp.(6020) ICP1 /MS 2106659 2010/03/23 2010/03/24 N_R Metals F.H. in Filter+ Rinses (6020) ICP1 /MS 2106560 2010/03/23 2010/03/24 N_R

Maxxam ID FH5458 Collected 2010/02/23 Sample ID RUN 1-M29 Shipped Matrix Stack Sampling Train Received 2010/03/11
TestDescription Instrumentation Batch Extracted Analyzed Analyst Metals B.H. in H2O2/HNO3 Imp.(6020) ICP1 /MS 2106659 2010/03/23 2010/03/24 N_R Metals F.H. in Filter+ Rinses (6020) ICP1 /MS 2106560 2010/03/23 2010/03/24 N_R

Maxxam ID FH5458D u p Collected 2010/02/23 Sample ID RUN 1-M29 Shipped Matrix Stack Sampling Train Received 2010/03/11
TestDescription Instrumentation Batch Extracted Analyzed Analyst Metals B.H. in H2O2/HNO3 Imp.(6020) ICP1 /MS 2106659 2010/03/24 2010/03/24 N_R Metals F.H. in Filter+ Rinses (6020) ICP1 /MS 2106560 2010/03/24 2010/03/24 N_R

Maxxam ID FH5459 Collected 2010/02/23 Sample ID RUN 2-M29 Shipped Matrix Stack Sampling Train Received 2010/03/11
TestDescription Instrumentation Batch Extracted Analyzed Analyst Metals B.H. in H2O2/HNO3 Imp.(6020) ICP1 /MS 2106659 2010/03/23 2010/03/24 N_R Metals F.H. in Filter+ Rinses (6020) ICP1 /MS 2106560 2010/03/23 2010/03/24 N_R

Maxxam ID FH5460 Collected 2010/02/23 Sample ID RUN 3-M29 Shipped Matrix Stack Sampling Train Received 2010/03/11
TestDescription Instrumentation Batch Extracted Analyzed Analyst Metals B.H. in H2O2/HNO3 Imp.(6020) ICP1 /MS 2106659 2010/03/23 2010/03/24 N_R Metals F.H. in Filter+ Rinses (6020) ICP1 /MS 2106560 2010/03/23 2010/03/24 N_R

Page 3 of 8

### Eagle Mountain Scientific Inc Maxxam Job #: B029231 Client Project #: 902637 Report Date: 2010/03/25 Projectname: NRG ENERGYINC. VIENNAPLANT

ELEMENTS BYICP/MS (STACKSAMPLING TRAIN)
Metals B.H. in H2O2/HNO3 Imp.(6020): Extra20xdilution was required forall samples exceptFH5457, due to the matrix(veryhigh S levels) Postdigestion duplicate and spike was done on sample FH5458 Some matrix interference suspected.
Metals F.H. in Filter+ Rinses (6020): Extra5xdilution was required forall samples exceptFH5457 due to the matrixand high levels Post digestion duplicate and spike was done on sample FH5458. Sample FH5459 was analyzed 100325.

Results relateonlytotheitems tested.

Page 4 of 8

### Eagle Mountain Scientific Inc Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG ENERGYINC. VIENNAPLANT 

### Quality AssuranceReport Maxxam Job Number: GB029231
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2106560 N_R MatrixSpike

(FH5458) Front HalfAntimony(Sb) 2010/03/24 100 % 70 - 130 MS/MSD RPD Front HalfAntimony(Sb) 2010/03/24 0 % 20 MatrixSpike (FH5458) Front Half Arsenic(As) 2010/03/24 98 % 70 - 130 MS/MSD RPD Front Half Arsenic(As) 2010/03/24 0 % 20 MatrixSpike (FH5458) Front HalfBeryllium (Be) 2010/03/24 102 % 70 - 130 MS/MSD RPD Front HalfBeryllium (Be) 2010/03/24 1.9 % 20 MatrixSpike (FH5458) Front HalfCadmium (Cd) 2010/03/24 98 % 70 - 130 MS/MSD RPD Front HalfCadmium (Cd) 2010/03/24 2.0 % 20 MatrixSpike (FH5458) Front HalfChromium (Cr) 2010/03/24 100 % 70 - 130 MS/MSD RPD Front HalfChromium (Cr) 2010/03/24 0 % 20 MatrixSpike (FH5458) FrontHalfCobalt(Co) 2010/03/24 102 % 70 - 130 MS/MSD RPD FrontHalfCobalt(Co) 2010/03/24 1 % 20 MatrixSpike (FH5458) FrontHalfLead (Pb) 2010/03/24 107 % 70 - 130 MS/MSD RPD FrontHalfLead (Pb) 2010/03/24 0.9 % 20 MatrixSpike (FH5458) FrontHalfManganese (Mn) 2010/03/24 104 % 70 - 130 MS/MSD RPD FrontHalfManganese (Mn) 2010/03/24 1.9 % 20 MatrixSpike (FH5458) FrontHalfNickel (Ni) 2010/03/24 103 % 70 - 130 MS/MSD RPD FrontHalfNickel (Ni) 2010/03/24 7.5 % 20 MatrixSpike (FH5458) Front HalfSelenium (Se) 2010/03/24 97 % 70 - 130 MS/MSD RPD Front HalfSelenium (Se) 2010/03/24 0 % 20 Spiked Blank Front HalfAntimony(Sb) 2010/03/24 98 % 85 - 115 RPD Front HalfAntimony(Sb) 2010/03/24 0.2 % 20 Spiked Blank Front Half Arsenic(As) 2010/03/24 100 % 85 - 115 RPD Front Half Arsenic(As) 2010/03/24 1.4 % 20 Spiked Blank Front HalfBeryllium (Be) 2010/03/24 105 % 85 - 115 RPD Front HalfBeryllium (Be) 2010/03/24 4.4 % 20 Spiked Blank Front HalfCadmium (Cd) 2010/03/24 98 % 85 - 115 RPD Front HalfCadmium (Cd) 2010/03/24 0.5 % 20 Spiked Blank Front HalfChromium (Cr) 2010/03/24 97 % 85 - 115 RPD Front HalfChromium (Cr) 2010/03/24 1.1 % 20 Spiked Blank FrontHalfCobalt(Co) 2010/03/24 98 % 85 - 115 RPD FrontHalfCobalt(Co) 2010/03/24 2.1 % 20 Spiked Blank FrontHalfLead (Pb) 2010/03/24 101 % 85 - 115 RPD FrontHalfLead (Pb) 2010/03/24 1.5 % 20 Spiked Blank FrontHalfManganese (Mn) 2010/03/24 100 % 85 - 115 RPD FrontHalfManganese (Mn) 2010/03/24 2.8 % 20 Spiked Blank FrontHalfNickel (Ni) 2010/03/24 99 % 85 - 115 RPD FrontHalfNickel (Ni) 2010/03/24 0.5 % 20 Spiked Blank Front HalfSelenium (Se) 2010/03/24 99 % 85 - 115 RPD Front HalfSelenium (Se) 2010/03/24 1.6 % 20 Method Blank Front HalfAntimony(Sb) 2010/03/24 ND, RDL=0.40 ug RPD Front HalfAntimony(Sb) 2010/03/24 NC % 20 Method Blank Front Half Arsenic(As) 2010/03/24 ND, RDL=0.40 ug RPD Front Half Arsenic(As) 2010/03/24 NC % 20 Method Blank Front HalfBeryllium (Be) 2010/03/24 ND, RDL=0.10 ug

Page 5 of 8

### Eagle Mountain Scientific Inc Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG ENERGYINC. VIENNAPLANT 

### Quality AssuranceReport

(Continued) Maxxam Job Number: GB029231
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2106560 N_R RPD Front HalfBeryllium (Be) 2010/03/24 NC % 20

Method Blank Front HalfCadmium (Cd) 2010/03/24 ND, RDL=0.10 ug RPD Front HalfCadmium (Cd) 2010/03/24 NC % 20 Method Blank Front HalfChromium (Cr) 2010/03/24 ND, RDL=0.30 ug RPD Front HalfChromium (Cr) 2010/03/24 NC % 20 Method Blank FrontHalfCobalt(Co) 2010/03/24 ND, RDL=0.10 ug RPD FrontHalfCobalt(Co) 2010/03/24 NC % 20 Method Blank FrontHalfLead (Pb) 2010/03/24 ND, RDL=0.20 ug RPD FrontHalfLead (Pb) 2010/03/24 NC % 20 Method Blank FrontHalfManganese (Mn) 2010/03/24 ND, RDL=0.75 ug RPD FrontHalfManganese (Mn) 2010/03/24 NC % 20 Method Blank FrontHalfNickel (Ni) 2010/03/24 ND, RDL=0.50 ug RPD FrontHalfNickel (Ni) 2010/03/24 NC % 20 Method Blank Front HalfSelenium (Se) 2010/03/24 ND, RDL=1.0 ug RPD Front HalfSelenium (Se) 2010/03/24 NC % 20 RPD - Sample/Sample Dup Front HalfAntimony(Sb) 2010/03/24 0.7 % 20

Front Half Arsenic(As) 2010/03/24 2.0 % 20 Front HalfBeryllium (Be) 2010/03/24 NC % 20 Front HalfCadmium (Cd) 2010/03/24 NC % 20 Front HalfChromium (Cr) 2010/03/24 3.3 % 20 FrontHalfCobalt(Co) 2010/03/24 2.1 % 20 FrontHalfLead (Pb) 2010/03/24 2.1 % 20 FrontHalfManganese (Mn) 2010/03/24 5.6 % 20 FrontHalfNickel (Ni) 2010/03/24 1.1 % 20 Front HalfSelenium (Se) 2010/03/24 NC % 20 2106659 N_R MatrixSpike

(FH5458) BackHalf Antimony (Sb) 2010/03/24 100 % 70 - 130 MS/MSD RPD BackHalf Antimony (Sb) 2010/03/24 1.0 % 20 MatrixSpike (FH5458) BackHalf Arsenic (As) 2010/03/24 99 % 70 - 130 MS/MSD RPD BackHalf Arsenic (As) 2010/03/24 0 % 20 MatrixSpike (FH5458) BackHalf Beryllium (Be) 2010/03/24 102 % 70 - 130 MS/MSD RPD BackHalf Beryllium (Be) 2010/03/24 0 % 20 MatrixSpike (FH5458) BackHalf Cadmium (Cd) 2010/03/24 100 % 70 - 130 MS/MSD RPD BackHalf Cadmium (Cd) 2010/03/24 2.0 % 20 MatrixSpike (FH5458) BackHalf Chromium (Cr) 2010/03/24 103 % 70 - 130 MS/MSD RPD BackHalf Chromium (Cr) 2010/03/24 1 % 20 MatrixSpike (FH5458) BackHalfCobalt(Co) 2010/03/24 108 % 70 - 130 MS/MSD RPD BackHalfCobalt(Co) 2010/03/24 2.8 % 20 MatrixSpike (FH5458) BackHalfLead (Pb) 2010/03/24 100 % 70 - 130 MS/MSD RPD BackHalfLead (Pb) 2010/03/24 1 % 20 MatrixSpike (FH5458) BackHalfManganese (Mn) 2010/03/24 106 % 70 - 130 MS/MSD RPD BackHalfManganese (Mn) 2010/03/24 1.9 % 20 MatrixSpike (FH5458) BackHalf Nickel (Ni) 2010/03/24 108 % 70 - 130 MS/MSD RPD BackHalf Nickel (Ni) 2010/03/24 2.8 % 20 MatrixSpike (FH5458) BackHalf Selenium (Se) 2010/03/24 103 % 70 - 130

Page 6 of 8

### Eagle Mountain Scientific Inc Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG ENERGYINC. VIENNAPLANT 

### Quality AssuranceReport

(Continued) Maxxam Job Number: GB029231
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2106659 N_R MS/MSD RPD BackHalf Selenium (Se) 2010/03/24 1 % 20

Spiked Blank BackHalf Antimony (Sb) 2010/03/24 105 % 85 - 115 RPD BackHalf Antimony (Sb) 2010/03/24 0.06 % 20 Spiked Blank BackHalf Arsenic (As) 2010/03/24 101 % 85 - 115 RPD BackHalf Arsenic (As) 2010/03/24 0.6 % 20 Spiked Blank BackHalf Beryllium (Be) 2010/03/24 104 % 85 - 115 RPD BackHalf Beryllium (Be) 2010/03/24 1.8 % 20 Spiked Blank BackHalf Cadmium (Cd) 2010/03/24 103 % 85 - 115 RPD BackHalf Cadmium (Cd) 2010/03/24 1.2 % 20 Spiked Blank BackHalf Chromium (Cr) 2010/03/24 102 % 85 - 115 RPD BackHalf Chromium (Cr) 2010/03/24 0.6 % 20 Spiked Blank BackHalfCobalt(Co) 2010/03/24 109 % 85 - 115 RPD BackHalfCobalt(Co) 2010/03/24 0.9 % 20 Spiked Blank BackHalfLead (Pb) 2010/03/24 101 % 85 - 115 RPD BackHalfLead (Pb) 2010/03/24 1 % 20 Spiked Blank BackHalfManganese (Mn) 2010/03/24 107 % 85 - 115 RPD BackHalfManganese (Mn) 2010/03/24 1.9 % 20 Spiked Blank BackHalf Nickel (Ni) 2010/03/24 103 % 85 - 115 RPD BackHalf Nickel (Ni) 2010/03/24 0.1 % 20 Spiked Blank BackHalf Selenium (Se) 2010/03/24 98 % 85 - 115 RPD BackHalf Selenium (Se) 2010/03/24 0.1 % 20 Method Blank BackHalf Antimony (Sb) 2010/03/24 ND, RDL=0.20 ug RPD BackHalf Antimony (Sb) 2010/03/24 NC % 20 Method Blank BackHalf Arsenic (As) 2010/03/24 ND, RDL=0.20 ug RPD BackHalf Arsenic (As) 2010/03/24 NC % 20 Method Blank BackHalf Beryllium (Be) 2010/03/24 ND, RDL=0.050 ug RPD BackHalf Beryllium (Be) 2010/03/24 NC % 20 Method Blank BackHalf Cadmium (Cd) 2010/03/24 ND, RDL=0.050 ug RPD BackHalf Cadmium (Cd) 2010/03/24 NC % 20 Method Blank BackHalf Chromium (Cr) 2010/03/24 0.22, RDL=0.15 ug RPD BackHalf Chromium (Cr) 2010/03/24 NC % 20 Method Blank BackHalfCobalt(Co) 2010/03/24 ND, RDL=0.050 ug RPD BackHalfCobalt(Co) 2010/03/24 NC % 20 Method Blank BackHalfLead (Pb) 2010/03/24 0.36, RDL=0.10 ug RPD BackHalfLead (Pb) 2010/03/24 NC % 20 Method Blank BackHalfManganese (Mn) 2010/03/24 ND, RDL=0.25 ug RPD BackHalfManganese (Mn) 2010/03/24 NC % 20 Method Blank BackHalf Nickel (Ni) 2010/03/24 ND, RDL=0.25 ug RPD BackHalf Nickel (Ni) 2010/03/24 NC % 20 Method Blank BackHalf Selenium (Se) 2010/03/24 ND, RDL=0.50 ug RPD BackHalf Selenium (Se) 2010/03/24 NC % 20 RPD - Sample/Sample Dup BackHalf Antimony (Sb) 2010/03/24 NC % 20

BackHalf Arsenic (As) 2010/03/24 NC % 20 BackHalf Beryllium (Be) 2010/03/24 NC % 20 BackHalf Cadmium (Cd) 2010/03/24 NC % 20 BackHalf Chromium (Cr) 2010/03/24 0.2 % 20 BackHalfCobalt(Co) 2010/03/24 NC % 20 BackHalfLead (Pb) 2010/03/24 NC % 20 BackHalfManganese (Mn) 2010/03/24 2.2 % 20 BackHalf Nickel (Ni) 2010/03/24 2.6 % 20 BackHalf Selenium (Se) 2010/03/24 NC % 20 Duplicate: Paired analysis ofa separate portion ofthe same sample. Used to evaluate the variance in the measurement. MatrixSpike: Asample to which a known amountofthe analyte ofinteresthas been added. Used to evaluate sample matrixinterference.

Page 7 of 8

### Eagle Mountain Scientific Inc Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG ENERGYINC. VIENNAPLANT 

### Quality AssuranceReport

(Continued) Maxxam Job Number: GB029231

Spiked Blank: Ablankmatrixto which aknown amountofthe analyte has been added. Used to evaluate analyte recovery. Method Blank: Ablankmatrixcontaining all reagents used in the analytical procedure. Used to identifylaboratorycontamination. NC (RPD): The RPD was notcalculated. The level ofanalyte detected in the parentsample and its duplicate was notsufficientlysignificantto permita reliable calculation.

Page 8 of 8

## Client: Method: Method 5/29 

## Facility: Run #: Project #: Analyst: Unit: Test Date:

Filter Date 2/19/10 2/19/10 ID#: Time 9:16 16:26 RH (%) 32 29 Weight 0.6263 0.6258 Date 2/27/10 2/28/10 Total: Time 16:20 8:15 RH (%) 20 21 Weight 0.7574 0.7574 mg

Acetone Date 1/29/10 1/30/10 ID#: Time 10:22 11:30 RH (%) 26 25 Weight 178.9349 178.9344 Date 2/27/10 2/28/10 Total: Time 8:47 6:31 RH (%) 26 24 Weight 178.9695 178.9700 mg
Organic Date ID#: Time RH (%) Weight Date Total: Time RH (%) Weight mg
Aqueous Date ID#: Time RH (%) Weight Date Total: Time RH (%) Weight mg ND=Non Detect 10

Final Weight (g) Final Weight (g) 1

HG1 Nicholas Presutti

Initial Weight (g) 

# PARTICULATE WEIGHT ANALYSIS

131.3

Initial Weight (g) NRG Vienna 902637 8 Ferbruary 24, 2010

Initial Weight (g)

Final Weight (g)

Sample Volume (ml)

Sample Volume (ml)

Sample Volume (ml) 0.6261

0.7574

178.9698 178.9347

Lab Note: 35.1

Initial Weight (g)

Final Weight (g)

## Client: Method: Facility: Run #: Project #: Analyst: Unit: Test Date:

Filter Date 2/19/10 2/19/10 ID#: Time 9:19 16:24 RH (%) 32 30 Weight 0.5940 0.5936 Date 2/27/10 2/28/10 Total: Time 16:21 8:15 RH (%) 20 21 Weight 0.7238 0.7243 mg

Acetone Date 1/29/10 1/30/10 ID#: Time 10:22 11:30 RH (%) 26 25 Weight 178.8248 178.8246 Date 2/27/10 2/28/10 Total: Time 8:47 6:29 RH (%) 26 24 Weight 178.8761 178.8764 mg
Organic Date ID#: Time RH (%) Weight Date Total: Time RH (%) Weight mg
Aqueous Date ID#: Time RH (%) Weight Date Total: Time RH (%) Weight mg ND=Non Detect Final Weight (g)

Lab Note: Sample Volume (ml) Initial Weight (g) Final Weight (g) 178.8763 51.6 Sample Volume (ml) Initial Weight (g) Sample Volume (ml) Initial Weight (g) 11 Final Weight (g) HG2 Final Weight (g) 0.7241 130.3 8 Ferbruary 24, 2010

Initial Weight (g) 0.5938 Vienna 2 902637 Nicholas Presutti 

# PARTICULATE WEIGHT ANALYSIS

NRG Method 5/29

178.8247

## Client: Method: Facility: Run #: Project #: Analyst: Unit: Test Date:

Filter Date 2/19/10 2/19/10 ID#: Time 9:20 16:23 RH (%) 32 30 Weight 0.6055 0.6051 Date 2/27/10 2/28/10 Total: Time 16:21 8:16 RH (%) 20 21 Weight 0.7460 0.7455 mg

Acetone Date 1/29/10 1/30/10 ID#: Time 10:22 11:30 RH (%) 26 25 Weight 178.5027 178.5022 Date 2/27/10 2/28/10 Total: Time 8:46 6:30 RH (%) 26 24 Weight 178.5979 178.5984 mg
Organic Date ID#: Time RH (%) Weight Date Total: Time RH (%) Weight mg
Aqueous Date ID#: Time RH (%) Weight Date Total: Time RH (%) Weight mg ND=Non Detect Lab Note: Sample Volume (ml) Initial Weight (g)

Final Weight (g) Initial Weight (g) Final Weight (g) Final Weight (g) 178.5982 95.7 Sample Volume (ml) 140.5 Sample Volume (ml) Initial Weight (g) 12 Initial Weight (g) 0.6053 HG3 Final Weight (g) 0.7458 Nicholas Presutti 8 Ferbruary 24, 2010 

# PARTICULATE WEIGHT ANALYSIS

NRG Method 5/29 Vienna 3 902637

178.5025

## Client: Method: OTM 27/OTM 28 

## Facility: Run #: Project #: Analyst: Unit: Test Date:

Filter Date 9/18/09 9/18/09 ID#: Time 9:40 16:48 RH (%) 46 47 Weight 0.1122 0.1122 Date 3/9/10 3/10/10 Total: Time 16:20 8:15 RH (%) 20 21 Weight 0.1301 0.1301 mg

Filter Date 9/18/09 9/18/09 ID#: Time 9:41 16:47 RH (%) 46 47 Weight 0.1118 0.1118 Date 3/9/10 3/10/10 Total: Time 16:21 8:15 RH (%) 20 21 Weight 0.1191 0.1196 mg

Filter Date 9/18/09 9/18/09 ID#: Time 9:42 16:46 RH (%) 46 47 Weight 0.1108 0.1110 Date 3/9/10 3/10/10 Total: Time 16:21 8:16 RH (%) 20 21 Weight 0.1143 0.1144 mg

Filter Date 9/18/09 9/18/09 ID#: Time 9:43 16:46 RH (%) 46 46 Weight 0.1115 0.1118 Date 3/9/10 3/10/10 Total: Time 16:22 8:17 RH (%) 20 21 Weight 0.1334 0.1336 mg ND=Non Detect m71

m72

m73 Final Weight (g) Final Weight (g) 1

m70 Nicholas Presutti

3.5

Initial Weight (g) 0.1117

0.1335 

# PARTICULATE WEIGHT ANALYSIS

17.9

Initial Weight (g) NRG Vienna 902637 8 February 24, 2010

Initial Weight (g)

Final Weight (g)

Sample Volume (ml)

Sample Volume (ml)

Sample Volume (ml) 0.1122

0.1301

0.1194 0.1118

0.1109

0.1144

Lab Note: 7.6

Initial Weight (g)

21.8 Final Weight (g)

## Client: Method: Facility: Run #: Project #: Analyst: Unit: Test Date:

Filter Date 9/18/09 9/18/09 ID#: Time 9:44 16:45 RH (%) 46 46 Weight 0.1102 0.1103 Date 3/9/10 3/10/10 Total: Time 16:23 8:18 RH (%) 20 21 Weight 0.1137 0.1137 mg

Filter Date 9/18/09 9/18/09 ID#: Time 9:45 16:51 RH (%) 46 47 Weight 0.1116 0.1115 Date 3/9/10 3/10/10 Total: Time 16:23 8:18 RH (%) 20 21 Weight 0.1150 0.1155 mg

Acetone Date 1/7/10 1/8/10 PM>2.5 Time 10:20 11:31 ID#: RH (%) 22 25 Weight 48.8766 48.8766 Date 3/24/10 3/24/10 Total: Time 14:45 14:57 RH (%) 0 0 Weight 48.8900 48.8904 mg

Acetone Date 1/7/10 1/8/10 PM<2.5 Time 10:21 11:31 ID#: RH (%) 22 25 100-24 Weight 50.1545 50.1545 Date 3/24/10 3/24/10 Total: Time 14:49 14:54 RH (%) 0 0 Weight 50.1566 50.1567 mg ND=Non Detect Final Weight (g) 50.1567 2.2 Lab Note: Sample Volume (ml) Initial Weight (g) 50.1545 100-5 Final Weight (g) 48.8902 13.6 0.1153 3.7 Sample Volume (ml) Initial Weight (g) 48.8766 Sample Volume (ml) Initial Weight (g) m75 Final Weight (g) m74 Final Weight (g) 0.1137 3.4 8 February 24, 2010

Initial Weight (g) 0.1103 Vienna 1 902637 Nicholas Presutti 

# PARTICULATE WEIGHT ANALYSIS

NRG OTM 27/OTM 28

0.1116

## Client: Method: Facility: Run #: Project #: Analyst: Unit: Test Date:

Filter Date ID#: Time RH (%) Weight Date Total: Time RH (%) Weight mg

Acetone Date #N/A #N/A #N/A ID#: Time #N/A #N/A #N/A RH (%) #N/A #N/A #N/A Weight #N/A #N/A #N/A Date #N/A #N/A #N/A Total: Time #N/A #N/A #N/A RH (%) #N/A #N/A #N/A Weight #N/A #N/A #N/A mg
Organic Date 3/24/10 3/25/10 ID#: Time 12:07 9:51 RH (%) 32 31 Weight 3.0659 3.0657 Date 4/28/10 4/29/10 Total: Time 12:33 11:33 RH (%) 34 32 Weight 3.0753 3.0749 mg
Aqueous Date 3/24/10 3/25/10 ID#: Time 12:11 9:50 RH (%) 32 31 Weight 3.1213 3.1214 Date 5/5/10 5/5/10 Total: Time 8:43 16:01 RH (%) 36 35 Weight 3.1755 3.1751 mg ND=Non Detect Lab Note: 53.9 9.3 Sample Volume (ml) Initial Weight (g) 3.0658 Tin 1

Tin 2 Final Weight (g) 3.1753 Initial Weight (g) 3.1214 Final Weight (g) 3.0751 Final Weight (g) #N/A #N/A Sample Volume (ml) Sample Volume (ml) Initial Weight (g) #N/A Initial Weight (g)

Final Weight (g) Nicholas Presutti 8 February 24, 2010 

# PARTICULATE WEIGHT ANALYSIS

NRG OTM 27/OTM 28 Vienna 1 902637

#N/A

## Client: Method: Method 5/OTM 28 

## Facility: Run #: Project #: Analyst: Unit: Test Date:

Filter Date 1/7/10 1/8/10 ID#: Time 10:20 11:31 RH (%) 22 25 Weight 49.8350 49.8349 Date 3/24/10 3/24/10 Total: Time 14:50 14:53 RH (%) 0 0 Weight 49.9447 49.9449 mg

Acetone Date 2/19/10 2/19/10 ID#: Time 9:21 16:22 RH (%) 32 30 Weight 0.6018 0.6013 Date 3/9/10 3/10/10 Total: Time 16:22 8:17 RH (%) 20 21 Weight 0.6706 0.6701 mg
Organic Date 3/18/10 3/19/10 ID#: Time 15:26 9:55 RH (%) 31 0 Weight 112.7960 112.7957 Date 4/28/10 4/29/10 Total: Time 12:33 11:40 RH (%) 34 32 Weight 112.7947 112.7945 mg
Aqueous Date 3/24/10 3/25/10 ID#: Time 12:10 9:47 RH (%) 32 31 Weight 3.1033 3.1037 Date 5/5/10 5/5/10 Total: Time 8:43 16:01 RH (%) 36 35 Weight 3.1150 3.1146 mg ND=Non Detect HG4

250-13

Tin 3 Final Weight (g) Final Weight (g) 2

100-30 Nicholas Presutti

ND 0.5

Initial Weight (g) 3.1035

3.1148 

# PARTICULATE WEIGHT ANALYSIS

109.8

Initial Weight (g) NRG Vienna 902637 8 Ferbruary 24, 2010

Initial Weight (g)

Final Weight (g)

Sample Volume (ml)

Sample Volume (ml)

Sample Volume (ml) 49.8350

49.9448

0.6704 0.6016

112.7959

112.7946

Lab Note: 68.8

Initial Weight (g)

11.3 Final Weight (g)

## Client: Method: Facility: Run #: Project #: Analyst: Unit: Test Date:

Filter Date 2/19/10 2/19/10 ID#: Time 9:23 16:21 RH (%) 32 30 Weight 0.5945 0.5941 Date 3/9/10 3/10/10 Total: Time 16:23 8:18 RH (%) 20 21 Weight 0.6684 0.6682 mg

Acetone Date 1/7/10 1/8/10 ID#: Time 10:21 11:30 RH (%) 22 25 Weight 48.5710 48.5710 Date 3/24/10 3/24/10 Total: Time 14:51 14:52 RH (%) 0 0 Weight 48.7093 48.7092 mg
Organic Date 3/18/10 3/19/10 3/22/10 ID#: Time 15:27 9:56 15:59 RH (%) 31 0 30 Weight 116.5630 116.5609 116.5604 Date 4/28/10 4/29/10 Total: Time 12:32 11:39 RH (%) 34 32 Weight 116.5641 116.5641 mg
Aqueous Date 3/24/10 3/25/10 ID#: Time 12:09 9:46 RH (%) 32 31 Weight 3.0690 3.0695 Date 5/5/10 5/5/10 Total: Time 8:42 16:02 RH (%) 36 35 Weight 3.0770 3.0773 mg ND=Non Detect Final Weight (g) 3.0772 7.9 Lab Note: Sample Volume (ml) Initial Weight (g) 3.0693 Tin 4 250-14 Final Weight (g) 116.5641 3.4 48.7093 138.3 Sample Volume (ml) Initial Weight (g) 116.5607 Sample Volume (ml) Initial Weight (g) 100-33 Final Weight (g) HG5 Final Weight (g) 0.6683 74.0 8 Ferbruary 24, 2010

Initial Weight (g) 0.5943 Vienna 3 902637 Nicholas Presutti 

# PARTICULATE WEIGHT ANALYSIS

NRG Method 5/OTM 28

48.5710

### Your Project #: 902637 Site:NRGENERGY

VIENNA PLANT Your C.O.C. #: N/A

Attention: Mark

Carlson Eagle Mountain 8905 Autumn OaksDr. Rockford, MN USA 55373

Report Date: 2010/03/15 

## CERTIFICATE

OF ANALYSIS
MAXXAMJOB#: B026190 Received: 2010/03/03,20:30 SampleMatrix: AIR #SamplesReceived: 4

Date Date Method Analyses Quantity Extracted Analyzed LaboratoryMethod Reference Aldehydes + Ketones in Air 4 2010/03/12 2010/03/12 BRL SOP-00229 EPA8315mod (M0011)



### Encryption

Key

Please direct all questions regarding this Certificate ofAnalysis to yourProject Manager.
CLAYTON JOHNSON, Project Manager Email: Clayton.Johnson@maxxamanalytics.com Phone#(905) 817-5769

==================================================================== Maxxam has procedures in place to guard againstimproperuse ofthe electronicsignature and have the required "signatories", as persection 5.10.2 ofISO/IEC 17025:2005(E), signing the reports. SCC and CALAhave approved this reporting process and electronicreportformat.

Total coverpages: 1

Page 1 of 5

### Eagle Mountain Maxxam Job #: B026190 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYVIENNAPLANT



### CARBONYL COMPOUNDS BY HPLC (AIR)

Maxxam ID F G 0 9 5 9 F

G 0 9 6 0 F

G 0 9 6 1 F

G 0 9 6 2 Sampling Date 2010/02/24 2010/02/24 2010/02/24 2010/02/24 COC Number N/A N/A N/A N/A U n i t s 4-BLANK 1-RUN 2-RUN 3-RUN RDL QC Batch DNPH 1-1 M0011 2-2 M0011 3-3 M0011 Aldehydes&

Ketones Formaldehyde (Methanal) ug/Tot. 2 6 <2 <2 2 2099212
N/A= Not Applicable RDL= Reportable Detection Limit QC Batch = QualityControl Batch

Page 2 of 5

### Eagle Mountain Maxxam Job #: B026190 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYVIENNAPLANT



### Test Summary

Maxxam ID FG0959 Collected 2010/02/24 Sample ID 4-BLANKDNPH Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Aldehydes + Ketones in Air LC/UV 2099212 2010/03/12 2010/03/12 SPS

Maxxam ID FG0960 Collected 2010/02/24 Sample ID 1-RUN 1-1 M0011 Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Aldehydes + Ketones in Air LC/UV 2099212 2010/03/12 2010/03/12 SPS

Maxxam ID FG0961 Collected 2010/02/24 Sample ID 2-RUN 2-2 M0011 Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Aldehydes + Ketones in Air LC/UV 2099212 2010/03/12 2010/03/12 SPS

Maxxam ID FG0962 Collected 2010/02/24 Sample ID 3-RUN 3-3M0011 Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Aldehydes + Ketones in Air LC/UV 2099212 2010/03/12 2010/03/12 SPS

Maxxam ID FG0962 D u p Collected 2010/02/24 Sample ID 3-RUN 3-3M0011 Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Aldehydes + Ketones in Air LC/UV 2099212 2010/03/12 2010/03/12 SPS

Page 3 of 5

### Eagle Mountain Maxxam Job #: B026190 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYVIENNAPLANT

GENERAL COMMENTS Samples have been corrected fordesorption efficiencies ifaverage percentrecoveries are less than 80% (does notapplyto gravimetricand inorganic analysis).

Results relateonlytotheitems tested.

Page 4 of 5

### Eagle Mountain Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG ENERGYVIENNAPLANT 

### Quality AssuranceReport Maxxam Job Number: GB026190
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2099212 SPS Spiked Blank Formaldehyde (Methanal) 2010/03/12 120 % N/A

RPD Formaldehyde (Methanal) 2010/03/12 0 % 30 Method Blank Formaldehyde (Methanal) 2010/03/12 2.3, RDL=0.2 ug/Tot. RPD - Sample/Sample Dup Formaldehyde (Methanal) 2010/03/12 NC % 30 Duplicate: Paired analysis ofa separate portion ofthe same sample. Used to evaluate the variance in the measurement. Spiked Blank: Ablankmatrixto which aknown amountofthe analyte has been added. Used to evaluate analyte recovery. Method Blank: Ablankmatrixcontaining all reagents used in the analytical procedure. Used to identifylaboratorycontamination. NC (RPD): The RPD was notcalculated. The level ofanalyte detected in the parentsample and its duplicate was notsufficientlysignificantto permita reliable calculation.

Page 5 of 5

### Your Project #: 902637 Site: NRG-ENERGY-VIENNA 8 Your C.O.C. #: N/A

Attention: Mark

Carlson Eagle Mountain 8905 Autumn OaksDr. Rockford, MN USA 55373

Report Date: 2010/03/26 

## CERTIFICATE

OF ANALYSIS
MAXXAMJOB#: B026989 Received: 2010/03/03,20:30 SampleMatrix: Stack

Sampling Train #SamplesReceived: 8

Date Date Method Analyses Quantity Extracted Analyzed LaboratoryMethod Reference SVOCs in MM5 SamplingTrain (EPA0010) ( 1 ) 8 2010/03/10 2010/03/23 BRL SOP-00200 EPA8270D mod(M0010) MM5 PAH in Air(M0010/8270Dmod) ( 1 ) 8 2010/03/10 2010/03/19 BRL SOP-00201 CARB429(ARBM1,M2)mod

(1) This testwas performed in Maxxam Mississauga underMaxxam Burlington SCC Accreditation



### Encryption

Key

Please direct all questions regarding this Certificate ofAnalysis to yourProject Manager.
CLAYTON JOHNSON, Project Manager Email: Clayton.Johnson@maxxamanalytics.com Phone#(905) 817-5769

==================================================================== Maxxam has procedures in place to guard againstimproperuse ofthe electronicsignature and have the required "signatories", as persection 5.10.2 ofISO/IEC 17025:2005(E), signing the reports. ForService Group specificvalidation please referto the Validation Signature Page.

Total coverpages: 1

Page 1 of 16

### Eagle Mountain Maxxam Job #: B026989 Client Project #: 902637 Report Date: 2010/03/26 Projectname: NRG-ENERGY-VIENNA8



### SEMI-VOLATILE ORGANICS BY GC-MS (STACKSAMPLING TRAIN)

Maxxam ID F G 4 5 3 3 F

G 4 5 3 4 F

G 4 5 3 5 F

G 4 5 3 6 Sampling Date 2010/02/24 2010/02/24 2010/02/24 2010/02/24 COC Number N/A N/A N/A N/A U n i t s BLANK BLANK TEST RDL TEST RDL QC Batch REAGENT-M0010 REAGENT-M0010 1-VIENNA 1-VIENNA 8-M0010 8-M0010
Semivolatile Organics 1,2,4-Trichlorobenzene ug <6 <6 <6 6 <6 6 2097422 1,2-Dichlorobenzene ug <6 <6 <6 6 <6 6 2097422 1,3-Dichlorobenzene ug <6 <6 <6 6 <6 6 2097422 1,4-Dichlorobenzene ug <6 <6 <6 6 <6 6 2097422 1-Methylnaphthalene ug <0.15 <0.15 0.21 0.15 <0.15 0.15 2097418 2,4,5-Trichlorophenol ug <6 <6 <6 6 <6 6 2097422 2,4,6-Trichlorophenol ug <5 <5 <5 5 <5 5 2097422 2,4-Dichlorophenol ug <4 <4 <4 4 <4 4 2097422 2,4-Dimethylphenol ug <6 <6 <6 6 <6 6 2097422 2,4-Dinitrophenol ug <10 <10 <10 10 <10 10 2097422 2,4-Dinitrotoluene ug <2 <2 <2 2 <2 2 2097422 2,6-Dinitrotoluene ug <3 <3 <3 3 <3 3 2097422 2-Chloronaphthalene ug <3 <3 <3 3 <3 3 2097422 2-Chlorophenol ug <8 <8 <8 8 <8 8 2097422 2-Methylanthracene ug <0.15 <0.15 <0.15 0.15 <0.15 0.15 2097418 2-Methylnaphthalene ug <0.15 <0.15 0.35 0.15 <0.15 0.15 2097418 2-Methylphenol ug <9 <9 <9 9 <9 9 2097422 2-Nitroaniline ug <20 <20 <20 20 <20 20 2097422 2-Nitrophenol ug <5 <5 <5 5 <5 5 2097422 3 & 4-methylphenol ug <10 <10 <10 10 <10 10 2097422 3,3'-Dichlorobenzidine ug <8 <8 <8 8 <8 8 2097422 3-Nitroaniline ug <20 <20 <20 20 <20 20 2097422 4,6-Dinitro-2-methylphenol ug <10 <10 <10 10 <10 10 2097422 4-Bromophenyl phenyl ether ug <2 <2 <2 2 <2 2 2097422 4-Chloro-3-Methylphenol ug <5 <5 <5 5 <5 5 2097422 4-Chloroaniline ug <20 <20 <20 20 <20 20 2097422 4-Chlorophenyl phenyl ether ug <3 <3 <3 3 <3 3 2097422 4-Nitroaniline ug <20 <20 <20 20 <20 20 2097422 4-Nitrophenol ug <10 <10 <10 10 <10 10 2097422 Acenaphthene ug <0.075 <0.075 0.102 0.075 <0.075 0.075 2097418
N/A= Not Applicable RDL= Reportable Detection Limit QC Batch = QualityControl Batch

Page 2 of 16

### Eagle Mountain Maxxam Job #: B026989 Client Project #: 902637 Report Date: 2010/03/26 Projectname: NRG-ENERGY-VIENNA8



### SEMI-VOLATILE ORGANICS BY GC-MS (STACKSAMPLING TRAIN)

Maxxam ID F G 4 5 3 3 F

G 4 5 3 4 F

G 4 5 3 5 F

G 4 5 3 6 Sampling Date 2010/02/24 2010/02/24 2010/02/24 2010/02/24 COC Number N/A N/A N/A N/A U n i t s BLANK BLANK TEST RDL TEST RDL QC Batch REAGENT-M0010 REAGENT-M0010 1-VIENNA 1-VIENNA 8-M0010 8-M0010 Acenaphthylene ug <0.075 <0.075 <0.075 0.075 <0.075 0.075 2097418 Aniline ug <20 <20 <20 20 <20 20 2097422 Anthracene ug <0.075 <0.075 <0.075 0.075 <0.075 0.075 2097418 Benzidine ug <60 <60 <60 60 <60 60 2097422 Benzo(a)anthracene ug <0.075 <0.075 <0.075 0.075 <0.075 0.075 2097418 Benzo(a)pyrene ug <0.075 <0.075 <0.075 0.075 <0.075 0.075 2097418 Benzo(b)fluoranthene ug <0.075 <0.075 <0.075 0.075 <0.075 0.075 2097418 Benzo(e)pyrene ug <0.15 <0.15 <0.15 0.15 <0.15 0.15 2097418 Benzo(g,h,i)perylene ug <0.075 <0.075 <0.075 0.075 <0.075 0.075 2097418 Benzo(k)fluoranthene ug <0.075 <0.075 <0.075 0.075 <0.075 0.075 2097418 Benzoic Acid ug <10 <10 <10 10 296 50 2097422 Benzyl Alcohol ug <6 <6 <6 6 <6 6 2097422 Benzyl butyl phthalate ug <2 <2 <2 2 <2 2 2097422 Bis(2-chloroethoxy)methane ug <4 <4 <4 4 <4 4 2097422 Bis(2-chloroethyl)ether ug <5 <5 <5 5 <5 5 2097422 Bis(2-chloroisopropyl)ether ug <5 <5 <5 5 <5 5 2097422 Bis(2-ethylhexyl)phthalate ug 12 <8 <8 8 <8 8 2097422 Carbazole ug <20 <20 <20 20 <20 20 2097422 Chrysene ug <0.075 <0.075 <0.075 0.075 <0.075 0.075 2097418 Coronene ug <0.15 <0.15 <0.15 0.15 <0.15 0.15 2097418 Dibenz(a,h)anthracene ug <0.075 <0.075 <0.075 0.075 <0.075 0.075 2097418 Dibenzofuran ug <20 <20 <20 20 <20 20 2097422 Diethyl phthalate ug <3 <3 <3 3 <3 3 2097422 Dimethyl phthalate ug <3 <3 <3 3 <3 3 2097422 Di-N-butyl phthalate ug <3 <3 <3 3 <3 3 2097422 Di-N-octyl phthalate ug <3 <3 <3 3 <3 3 2097422 Fluoranthene ug <0.075 <0.075 <0.075 0.075 <0.075 0.075 2097418 Fluorene ug <0.075 <0.075 <0.075 0.075 <0.075 0.075 2097418 Hexachlorobenzene ug <6 <6 <6 6 <6 6 2097422 Hexachlorobutadiene ug <6 <6 <6 6 <6 6 2097422 Hexachlorocyclopentadiene ug <6 <6 <6 6 <6 6 2097422 Hexachloroethane ug <6 <6 <6 6 <6 6 2097422
N/A= Not Applicable QC Batch = QualityControl Batch

Page 3 of 16

### Eagle Mountain Maxxam Job #: B026989 Client Project #: 902637 Report Date: 2010/03/26 Projectname: NRG-ENERGY-VIENNA8



### SEMI-VOLATILE ORGANICS BY GC-MS (STACKSAMPLING TRAIN)

Maxxam ID F G 4 5 3 3 F

G 4 5 3 4 F

G 4 5 3 5 F

G 4 5 3 6 Sampling Date 2010/02/24 2010/02/24 2010/02/24 2010/02/24 COC Number N/A N/A N/A N/A U n i t s BLANK BLANK TEST RDL TEST RDL QC Batch REAGENT-M0010 REAGENT-M0010 1-VIENNA 1-VIENNA 8-M0010 8-M0010 Indeno(1,2,3-cd)pyrene ug <0.075 <0.075 <0.075 0.075 <0.075 0.075 2097418 Isophorone ug <10 <10 <10 10 <10 10 2097422 Naphthalene ug <0.11 0.14 0.32 0.11 1.19 0.11 2097418 Nitrobenzene ug <6 <6 <6 6 <6 6 2097422 N-Nitrosodimethylamine ug <30 <30 <30 30 <30 30 2097422 N-Nitroso-di-n-propylamine ug <6 <6 <6 6 <6 6 2097422 N-Nitrosodiphenylamine ug <6 <6 <6 6 <6 6 2097422 Pentachlorophenol ug <9 <9 <9 9 <9 9 2097422 Perylene ug <0.15 <0.15 <0.15 0.15 <0.15 0.15 2097418 Phenanthrene ug <0.075 <0.075 0.110 0.075 <0.075 0.075 2097418 Phenol ug <5 <5 <5 5 10 5 2097422 Pyrene ug <0.075 <0.075 <0.075 0.075 <0.075 0.075 2097418 SurrogateRecovery(%) 2,4,6-Tribromophenol % 56 0.75 ( 1 ) 70 72 2097422 2-Fluorobiphenyl % 92 94 83 97 2097422 2-Fluorophenol % 74 69 72 2097422 D5-Nitrobenzene % 90 94 81 96 2097422 D5-Phenol % 90 85 82 101 2097422 D10-Anthracene % 88 88 65 90 2097418 D10-Fluorene (FS) % 76 83 2097418 D12-Benzo(a)pyrene % 92 93 16( 1 ) 100 2097418 D12-Chrysene % 78 80 86 87 2097418 D14-Terphenyl (FS) % 81 91 2097418
N/A= Not Applicable QC Batch = QualityControl Batch ( 1 ) RecoveryorRPD forthis parameteris outside control limits. The overall qualitycontrol forthis analysis meets acceptability criteria.

Page 4 of 16

### Eagle Mountain Maxxam Job #: B026989 Client Project #: 902637 Report Date: 2010/03/26 Projectname: NRG-ENERGY-VIENNA8



### SEMI-VOLATILE ORGANICS BY GC-MS (STACKSAMPLING TRAIN)

Maxxam ID F G 4 5 3 7 F

G 4 5 3 8 F

G 4 5 3 9 Sampling Date 2010/02/24 2010/02/24 2010/02/24 COC Number N/A N/A N/A U n i t s TEST RDL TEST RDL TEST RDL QC Batch 2-VIENNA 2-VIENNA 3-VIENNA 8-M0010 8-M0010 8-M0010
Semivolatile Organics 1,2,4-Trichlorobenzene ug <6 6 <6 6 <6 6 2097422 1,2-Dichlorobenzene ug <6 6 <6 6 <6 6 2097422 1,3-Dichlorobenzene ug <6 6 <6 6 <6 6 2097422 1,4-Dichlorobenzene ug <6 6 <6 6 <6 6 2097422 1-Methylnaphthalene ug <0.15 0.15 <0.15 0.15 <0.15 0.15 2097418 2,4,5-Trichlorophenol ug <6 6 <6 6 <6 6 2097422 2,4,6-Trichlorophenol ug <5 5 <5 5 <5 5 2097422 2,4-Dichlorophenol ug <4 4 <4 4 <4 4 2097422 2,4-Dimethylphenol ug <6 6 <6 6 <6 6 2097422 2,4-Dinitrophenol ug <10 10 <10 10 <10 10 2097422 2,4-Dinitrotoluene ug <2 2 <2 2 <2 2 2097422 2,6-Dinitrotoluene ug <3 3 <3 3 <3 3 2097422 2-Chloronaphthalene ug <3 3 <3 3 <3 3 2097422 2-Chlorophenol ug <8 8 <8 8 <8 8 2097422 2-Methylanthracene ug <0.15 0.15 <0.15 0.15 <0.15 0.15 2097418 2-Methylnaphthalene ug <0.15 0.15 0.17 0.15 <0.15 0.15 2097418 2-Methylphenol ug <9 9 <9 9 <9 9 2097422 2-Nitroaniline ug <20 20 <20 20 <20 20 2097422 2-Nitrophenol ug <5 5 <5 5 <5 5 2097422 3 & 4-methylphenol ug <10 10 13 10 <10 10 2097422 3,3'-Dichlorobenzidine ug <8 8 <8 8 <8 8 2097422 3-Nitroaniline ug <20 20 <20 20 <20 20 2097422 4,6-Dinitro-2-methylphenol ug <10 10 <10 10 <10 10 2097422 4-Bromophenyl phenyl ether ug <2 2 <2 2 <2 2 2097422 4-Chloro-3-Methylphenol ug <5 5 <5 5 <5 5 2097422 4-Chloroaniline ug <20 20 <20 20 <20 20 2097422 4-Chlorophenyl phenyl ether ug <3 3 <3 3 <3 3 2097422 4-Nitroaniline ug <20 20 <20 20 <20 20 2097422 4-Nitrophenol ug <10 10 <10 10 <10 10 2097422 Acenaphthene ug <0.075 0.075 <0.075 0.075 <0.075 0.075 2097418
N/A= Not Applicable RDL= Reportable Detection Limit QC Batch = QualityControl Batch

Page 5 of 16

### Eagle Mountain Maxxam Job #: B026989 Client Project #: 902637 Report Date: 2010/03/26 Projectname: NRG-ENERGY-VIENNA8



### SEMI-VOLATILE ORGANICS BY GC-MS (STACKSAMPLING TRAIN)

Maxxam ID F G 4 5 3 7 F

G 4 5 3 8 F

G 4 5 3 9 Sampling Date 2010/02/24 2010/02/24 2010/02/24 COC Number N/A N/A N/A U n i t s TEST RDL TEST RDL TEST RDL QC Batch 2-VIENNA 2-VIENNA 3-VIENNA 8-M0010 8-M0010 8-M0010 Acenaphthylene ug <0.075 0.075 <0.075 0.075 <0.075 0.075 2097418 Aniline ug <20 20 <20 20 <20 20 2097422 Anthracene ug <0.075 0.075 <0.075 0.075 <0.075 0.075 2097418 Benzidine ug <60 60 <60 60 <60 60 2097422 Benzo(a)anthracene ug <0.075 0.075 <0.075 0.075 <0.075 0.075 2097418 Benzo(a)pyrene ug <0.075 0.075 <0.075 0.075 <0.075 0.075 2097418 Benzo(b)fluoranthene ug <0.075 0.075 <0.075 0.075 <0.075 0.075 2097418 Benzo(e)pyrene ug <0.15 0.15 <0.15 0.15 <0.15 0.15 2097418 Benzo(g,h,i)perylene ug <0.075 0.075 <0.075 0.075 <0.075 0.075 2097418 Benzo(k)fluoranthene ug <0.075 0.075 <0.075 0.075 <0.075 0.075 2097418 Benzoic Acid ug <10 10 148 50 <10 10 2097422 Benzyl Alcohol ug <6 6 <6 6 <6 6 2097422 Benzyl butyl phthalate ug <2 2 <2 2 <2 2 2097422 Bis(2-chloroethoxy)methane ug <4 4 <4 4 <4 4 2097422 Bis(2-chloroethyl)ether ug <5 5 <5 5 <5 5 2097422 Bis(2-chloroisopropyl)ether ug <5 5 <5 5 <5 5 2097422 Bis(2-ethylhexyl)phthalate ug <8 8 <8 8 11 8 2097422 Carbazole ug <20 20 <20 20 <20 20 2097422 Chrysene ug <0.075 0.075 <0.075 0.075 <0.075 0.075 2097418 Coronene ug <0.15 0.15 <0.15 0.15 <0.15 0.15 2097418 Dibenz(a,h)anthracene ug <0.075 0.075 <0.075 0.075 <0.075 0.075 2097418 Dibenzofuran ug <20 20 <20 20 <20 20 2097422 Diethyl phthalate ug <3 3 <3 3 <3 3 2097422 Dimethyl phthalate ug <3 3 <3 3 <3 3 2097422 Di-N-butyl phthalate ug <3 3 <3 3 <3 3 2097422 Di-N-octyl phthalate ug <3 3 <3 3 <3 3 2097422 Fluoranthene ug <0.075 0.075 <0.075 0.075 <0.075 0.075 2097418 Fluorene ug <0.075 0.075 <0.075 0.075 <0.075 0.075 2097418 Hexachlorobenzene ug <6 6 <6 6 <6 6 2097422 Hexachlorobutadiene ug <6 6 <6 6 <6 6 2097422 Hexachlorocyclopentadiene ug <6 6 <6 6 <6 6 2097422 Hexachloroethane ug <6 6 <6 6 <6 6 2097422
N/A= Not Applicable QC Batch = QualityControl Batch

Page 6 of 16

### Eagle Mountain Maxxam Job #: B026989 Client Project #: 902637 Report Date: 2010/03/26 Projectname: NRG-ENERGY-VIENNA8



### SEMI-VOLATILE ORGANICS BY GC-MS (STACKSAMPLING TRAIN)

Maxxam ID F G 4 5 3 7 F

G 4 5 3 8 F

G 4 5 3 9 Sampling Date 2010/02/24 2010/02/24 2010/02/24 COC Number N/A N/A N/A U n i t s TEST RDL TEST RDL TEST RDL QC Batch 2-VIENNA 2-VIENNA 3-VIENNA 8-M0010 8-M0010 8-M0010 Indeno(1,2,3-cd)pyrene ug <0.075 0.075 <0.075 0.075 <0.075 0.075 2097418 Isophorone ug <10 10 <10 10 <10 10 2097422 Naphthalene ug <0.11 0.11 0.53 0.11 <0.11 0.11 2097418 Nitrobenzene ug <6 6 <6 6 <6 6 2097422 N-Nitrosodimethylamine ug <30 30 <30 30 <30 30 2097422 N-Nitroso-di-n-propylamine ug <6 6 <6 6 <6 6 2097422 N-Nitrosodiphenylamine ug <6 6 <6 6 <6 6 2097422 Pentachlorophenol ug <9 9 <9 9 <9 9 2097422 Perylene ug <0.15 0.15 <0.15 0.15 <0.15 0.15 2097418 Phenanthrene ug <0.075 0.075 0.121 0.075 <0.075 0.075 2097418 Phenol ug <5 5 6 5 <5 5 2097422 Pyrene ug <0.075 0.075 <0.075 0.075 <0.075 0.075 2097418 SurrogateRecovery(%) 2,4,6-Tribromophenol % 57 69 105 2097422 2-Fluorobiphenyl % 80 98 95 2097422 2-Fluorophenol % 62 93 2097422 D5-Nitrobenzene % 79 97 88 2097422 D5-Phenol % 77 104 91 2097422 D10-Anthracene % 84 102 54 2097418 D10-Fluorene (FS) % 84 2097418 D12-Benzo(a)pyrene % 65 104 11 ( 1 ) 2097418 D12-Chrysene % 82 87 83 2097418 D14-Terphenyl (FS) % 88 2097418
N/A= Not Applicable QC Batch = QualityControl Batch ( 1 ) RecoveryorRPD forthis parameteris outside control limits. The overall qualitycontrol forthis analysis meets acceptability criteria.

Page 7 of 16

### Eagle Mountain Maxxam Job #: B026989 Client Project #: 902637 Report Date: 2010/03/26 Projectname: NRG-ENERGY-VIENNA8



### SEMI-VOLATILE ORGANICS BY GC-MS (STACKSAMPLING TRAIN)

Maxxam ID F G 4 5 4 0 Sampling Date 2010/02/24 COC Number N/A U n i t s TEST RDL QC Batch 3-VIENNA 8-M0010
Semivolatile Organics 1,2,4-Trichlorobenzene ug <6 6 2097422 1,2-Dichlorobenzene ug <6 6 2097422 1,3-Dichlorobenzene ug <6 6 2097422 1,4-Dichlorobenzene ug <6 6 2097422 1-Methylnaphthalene ug <0.15 0.15 2097418 2,4,5-Trichlorophenol ug <6 6 2097422 2,4,6-Trichlorophenol ug <5 5 2097422 2,4-Dichlorophenol ug <4 4 2097422 2,4-Dimethylphenol ug <6 6 2097422 2,4-Dinitrophenol ug <10 10 2097422 2,4-Dinitrotoluene ug <2 2 2097422 2,6-Dinitrotoluene ug <3 3 2097422 2-Chloronaphthalene ug <3 3 2097422 2-Chlorophenol ug <8 8 2097422 2-Methylanthracene ug <0.15 0.15 2097418 2-Methylnaphthalene ug <0.15 0.15 2097418 2-Methylphenol ug <9 9 2097422 2-Nitroaniline ug <20 20 2097422 2-Nitrophenol ug <5 5 2097422 3 & 4-methylphenol ug 15 10 2097422 3,3'-Dichlorobenzidine ug <8 8 2097422 3-Nitroaniline ug <20 20 2097422 4,6-Dinitro-2-methylphenol ug <10 10 2097422 4-Bromophenyl phenyl ether ug <2 2 2097422 4-Chloro-3-Methylphenol ug <5 5 2097422 4-Chloroaniline ug <20 20 2097422 4-Chlorophenyl phenyl ether ug <3 3 2097422 4-Nitroaniline ug <20 20 2097422 4-Nitrophenol ug <10 10 2097422 Acenaphthene ug <0.075 0.075 2097418
N/A= Not Applicable RDL= Reportable Detection Limit QC Batch = QualityControl Batch

Page 8 of 16

### Eagle Mountain Maxxam Job #: B026989 Client Project #: 902637 Report Date: 2010/03/26 Projectname: NRG-ENERGY-VIENNA8



### SEMI-VOLATILE ORGANICS BY GC-MS (STACKSAMPLING TRAIN)

Maxxam ID F G 4 5 4 0 Sampling Date 2010/02/24 COC Number N/A U n i t s TEST RDL QC Batch 3-VIENNA 8-M0010 Acenaphthylene ug <0.075 0.075 2097418 Aniline ug <20 20 2097422 Anthracene ug <0.075 0.075 2097418 Benzidine ug <60 60 2097422 Benzo(a)anthracene ug <0.075 0.075 2097418 Benzo(a)pyrene ug <0.075 0.075 2097418 Benzo(b)fluoranthene ug <0.075 0.075 2097418 Benzo(e)pyrene ug <0.15 0.15 2097418 Benzo(g,h,i)perylene ug <0.075 0.075 2097418 Benzo(k)fluoranthene ug <0.075 0.075 2097418 Benzoic Acid ug 161 50 2097422 Benzyl Alcohol ug <6 6 2097422 Benzyl butyl phthalate ug <2 2 2097422 Bis(2-chloroethoxy)methane ug <4 4 2097422 Bis(2-chloroethyl)ether ug <5 5 2097422 Bis(2-chloroisopropyl)ether ug <5 5 2097422 Bis(2-ethylhexyl)phthalate ug <8 8 2097422 Carbazole ug <20 20 2097422 Chrysene ug <0.075 0.075 2097418 Coronene ug <0.15 0.15 2097418 Dibenz(a,h)anthracene ug <0.075 0.075 2097418 Dibenzofuran ug <20 20 2097422 Diethyl phthalate ug <3 3 2097422 Dimethyl phthalate ug <3 3 2097422 Di-N-butyl phthalate ug <3 3 2097422 Di-N-octyl phthalate ug <3 3 2097422 Fluoranthene ug <0.075 0.075 2097418 Fluorene ug <0.075 0.075 2097418 Hexachlorobenzene ug <6 6 2097422 Hexachlorobutadiene ug <6 6 2097422 Hexachlorocyclopentadiene ug <6 6 2097422 Hexachloroethane ug <6 6 2097422
N/A= Not Applicable QC Batch = QualityControl Batch

Page 9 of 16

### Eagle Mountain Maxxam Job #: B026989 Client Project #: 902637 Report Date: 2010/03/26 Projectname: NRG-ENERGY-VIENNA8



### SEMI-VOLATILE ORGANICS BY GC-MS (STACKSAMPLING TRAIN)

Maxxam ID F G 4 5 4 0 Sampling Date 2010/02/24 COC Number N/A U n i t s TEST RDL QC Batch 3-VIENNA 8-M0010 Indeno(1,2,3-cd)pyrene ug <0.075 0.075 2097418 Isophorone ug <10 10 2097422 Naphthalene ug 0.39 0.11 2097418 Nitrobenzene ug <6 6 2097422 N-Nitrosodimethylamine ug <30 30 2097422 N-Nitroso-di-n-propylamine ug <6 6 2097422 N-Nitrosodiphenylamine ug <6 6 2097422 Pentachlorophenol ug <9 9 2097422 Perylene ug <0.15 0.15 2097418 Phenanthrene ug <0.075 0.075 2097418 Phenol ug <5 5 2097422 Pyrene ug <0.075 0.075 2097418 SurrogateRecovery(%) 2,4,6-Tribromophenol % 64 2097422 2-Fluorobiphenyl % 89 2097422 D5-Nitrobenzene % 90 2097422 D5-Phenol % 96 2097422 D10-Anthracene % 90 2097418 D10-Fluorene (FS) % 71 2097418 D12-Benzo(a)pyrene % 97 2097418 D12-Chrysene % 80 2097418 D14-Terphenyl (FS) % 79 2097418
N/A= Not Applicable QC Batch = QualityControl Batch

Page 10 of 16

### Eagle Mountain Maxxam Job #: B026989 Client Project #: 902637 Report Date: 2010/03/26 Projectname: NRG-ENERGY-VIENNA8



### Test Summary

Maxxam ID FG4533 Collected 2010/02/24 Sample ID BLANK REAGENT-M0010 Shipped Matrix Stack Sampling Train Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst SVOCs in MM5 SamplingTrain (EPA0010) GC/MS 2097422 2010/03/10 2010/03/23 WZ MM5 PAH in Air(M0010/8270Dmod) GC/MS 2097418 2010/03/10 2010/03/19 WZ

Maxxam ID FG4534 Collected 2010/02/24 Sample ID BLANK REAGENT-M0010 Shipped Matrix Stack Sampling Train Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst SVOCs in MM5 SamplingTrain (EPA0010) GC/MS 2097422 2010/03/10 2010/03/23 WZ MM5 PAH in Air(M0010/8270Dmod) GC/MS 2097418 2010/03/10 2010/03/19 WZ

Maxxam ID FG4535 Collected 2010/02/24 Sample ID TEST1-VIENNA8-M0010 Shipped Matrix Stack Sampling Train Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst SVOCs in MM5 SamplingTrain (EPA0010) GC/MS 2097422 2010/03/10 2010/03/23 WZ MM5 PAH in Air(M0010/8270Dmod) GC/MS 2097418 2010/03/10 2010/03/19 WZ

Maxxam ID FG4536 Collected 2010/02/24 Sample ID TEST1-VIENNA8-M0010 Shipped Matrix Stack Sampling Train Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst SVOCs in MM5 SamplingTrain (EPA0010) GC/MS 2097422 2010/03/10 2010/03/23 WZ MM5 PAH in Air(M0010/8270Dmod) GC/MS 2097418 2010/03/10 2010/03/19 WZ

Maxxam ID FG4537 Collected 2010/02/24 Sample ID TEST2-VIENNA8-M0010 Shipped Matrix Stack Sampling Train Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst SVOCs in MM5 SamplingTrain (EPA0010) GC/MS 2097422 2010/03/10 2010/03/23 WZ MM5 PAH in Air(M0010/8270Dmod) GC/MS 2097418 2010/03/10 2010/03/19 WZ

Maxxam ID FG4538 Collected 2010/02/24 Sample ID TEST2-VIENNA8-M0010 Shipped Matrix Stack Sampling Train Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst SVOCs in MM5 SamplingTrain (EPA0010) GC/MS 2097422 2010/03/10 2010/03/23 WZ MM5 PAH in Air(M0010/8270Dmod) GC/MS 2097418 2010/03/10 2010/03/19 WZ

Page 11 of 16

### Eagle Mountain Maxxam Job #: B026989 Client Project #: 902637 Report Date: 2010/03/26 Projectname: NRG-ENERGY-VIENNA8



### Test Summary

Maxxam ID FG4539 Collected 2010/02/24 Sample ID TEST3-VIENNA8-M0010 Shipped Matrix Stack Sampling Train Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst SVOCs in MM5 SamplingTrain (EPA0010) GC/MS 2097422 2010/03/10 2010/03/23 WZ MM5 PAH in Air(M0010/8270Dmod) GC/MS 2097418 2010/03/10 2010/03/19 WZ

Maxxam ID FG4540 Collected 2010/02/24 Sample ID TEST3-VIENNA8-M0010 Shipped Matrix Stack Sampling Train Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst SVOCs in MM5 SamplingTrain (EPA0010) GC/MS 2097422 2010/03/10 2010/03/23 WZ MM5 PAH in Air(M0010/8270Dmod) GC/MS 2097418 2010/03/10 2010/03/19 WZ

Page 12 of 16

### Eagle Mountain Maxxam Job #: B026989 Client Project #: 902637 Report Date: 2010/03/26 Projectname: NRG-ENERGY-VIENNA8

GENERAL COMMENTS
PAHMSM5-TR Sample sentoutas 2xsplitand extracted as 3xsplit, field spike was corrected.
ABNMM-TR Bis(2-ethylhexyl)phthalate positive found in blank. Samples should be considered to be possiblycontaminated to the level found in the blank. Anline ,4-Chloroaniline and Benzidine are above 20% RSD in intial calibration and continuing. Sample FG4534-01: ABNMM5-TR Surrogate 2,4,6-Tribromophenol was lowin Sample Sample FG4535-01: PAHMM5-TR
Lowrecoveryofsurrogate D12-Benzo(a)pyrene in Sample
Internal Std area response criteria was high in Sample. Rerun with similarresults. Original run reported. Sample FG4536-01: ABNMM5-TR Sample was injected at9min atsolventdelaydue to huge peckat6 min. So there is no surrogate 2 Fluorophenol reported. Sample was rerun ata4xdilution forBenzoicAcid due to exceedence oflinearrange. Mdls were raised accordingly. Sample FG4538-01: ABNMM5-TR Sample was injected at9min atsolventdelaydue to huge peckat6 min. So there is no surrogate 2 Fluorophenol reported. Sample was rerun ata4xdilution forBenzoicAcid due to exceedence oflinearrange. Mdls were raised accordingly. Sample FG4539-01: PAHMM5-TR
Lowrecoveryofsurrogate D12-Benzo(a)pyrene in Sample
ABNMM5-TR Internal Std area response criteria was lowin Sample. Rrerun with similarresults. Original run reported. Sample FG4540-01: ABNMM5-TR Sample was injected at9min atsolventdelaydue to huge peckat6 min. So there is no surrogate 2 Fluorophenol reported. Sample was rerun ata4xdilution forBenzoicAcid due to exceedence oflinearrange. Mdls were raised accordingly.

Results relateonlytotheitems tested.

Page 13 of 16

### Eagle Mountain Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG-ENERGY-VIENNA8 

### Quality AssuranceReport Maxxam Job Number: GB026989
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2097418 WZ Spiked Blank D10-Anthracene 2010/03/19 83 % 50 - 150 D12-Benzo(a)pyrene 2010/03/19 106 % 50 - 150 D12-Chrysene 2010/03/19 99 % 50 - 150 Acenaphthene 2010/03/19 88 % 60 - 130 RPD Acenaphthene 2010/03/19 7.8 % 50 Spiked Blank Acenaphthylene 2010/03/19 91 % 60 - 130 RPD Acenaphthylene 2010/03/19 11.6 % 50 Spiked Blank Anthracene 2010/03/19 85 % 60 - 130 RPD Anthracene 2010/03/19 6.0 % 50 Spiked Blank Benzo(a)anthracene 2010/03/19 84 % 60 - 130 RPD Benzo(a)anthracene 2010/03/19 10.1 % 50 Spiked Blank Benzo(a)pyrene 2010/03/19 88 % 60 - 130 RPD Benzo(a)pyrene 2010/03/19 6.2 % 50 Spiked Blank Benzo(b)fluoranthene 2010/03/19 84 % 60 - 130 RPD Benzo(b)fluoranthene 2010/03/19 2.7 % 50 Spiked Blank Benzo(g,h,i)perylene 2010/03/19 89 % 60 - 130 RPD Benzo(g,h,i)perylene 2010/03/19 6.0 % 50 Spiked Blank Benzo(k)fluoranthene 2010/03/19 92 % 60 - 130 RPD Benzo(k)fluoranthene 2010/03/19 12.3 % 50 Spiked Blank Chrysene 2010/03/19 97 % 60 - 130 RPD Chrysene 2010/03/19 11.3 % 50 Spiked Blank Dibenz(a,h)anthracene 2010/03/19 84 % 60 - 130 RPD Dibenz(a,h)anthracene 2010/03/19 3.6 % 50 Spiked Blank Fluoranthene 2010/03/19 87 % 60 - 130 RPD Fluoranthene 2010/03/19 3.7 % 50 Spiked Blank Fluorene 2010/03/19 85 % 60 - 130 RPD Fluorene 2010/03/19 10.1 % 50 Spiked Blank Indeno(1,2,3-cd)pyrene 2010/03/19 83 % 60 - 130 RPD Indeno(1,2,3-cd)pyrene 2010/03/19 4.2 % 50 Spiked Blank Naphthalene 2010/03/19 90 % 60 - 130 RPD Naphthalene 2010/03/19 10.7 % 50 Spiked Blank Phenanthrene 2010/03/19 80 % 60 - 130 RPD Phenanthrene 2010/03/19 7.6 % 50 Spiked Blank Pyrene 2010/03/19 85 % 60 - 130 RPD Pyrene 2010/03/19 0.6 % 50 Method Blank D10-Anthracene 2010/03/19 82 % 50 - 150

D12-Benzo(a)pyrene 2010/03/19 101 % 50 - 150 D12-Chrysene 2010/03/19 90 % 50 - 150 1-Methylnaphthalene 2010/03/19 ND, RDL=0.15 ug 2-Methylanthracene 2010/03/19 ND, RDL=0.15 ug 2-Methylnaphthalene 2010/03/19 ND, RDL=0.15 ug Acenaphthene 2010/03/19 ND, RDL=0.075 ug Acenaphthylene 2010/03/19 ND, RDL=0.075 ug Anthracene 2010/03/19 ND, RDL=0.075 ug Benzo(a)anthracene 2010/03/19 ND, RDL=0.075 ug Benzo(a)pyrene 2010/03/19 ND, RDL=0.075 ug Benzo(b)fluoranthene 2010/03/19 ND, RDL=0.075 ug Benzo(e)pyrene 2010/03/19 ND, RDL=0.15 ug Benzo(g,h,i)perylene 2010/03/19 ND, RDL=0.075 ug Benzo(k)fluoranthene 2010/03/19 ND, RDL=0.075 ug Chrysene 2010/03/19 ND, RDL=0.075 ug Coronene 2010/03/19 ND, RDL=0.15 ug Dibenz(a,h)anthracene 2010/03/19 ND, RDL=0.075 ug Fluoranthene 2010/03/19 ND, RDL=0.075 ug Fluorene 2010/03/19 ND, RDL=0.075 ug

Page 14 of 16

### Eagle Mountain Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG-ENERGY-VIENNA8 

### Quality AssuranceReport

(Continued) Maxxam Job Number: GB026989
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2097418 WZ Method Blank Indeno(1,2,3-cd)pyrene 2010/03/19 ND, RDL=0.075 ug Naphthalene 2010/03/19 ND, RDL=0.11 ug Perylene 2010/03/19 ND, RDL=0.15 ug Phenanthrene 2010/03/19 ND, RDL=0.075 ug Pyrene 2010/03/19 ND, RDL=0.075 ug 2097422 WZ Spiked Blank 2,4,6-Tribromophenol 2010/03/23 100 % 24- 121 2-Fluorobiphenyl 2010/03/23 91 % 30 - 115 2-Fluorophenol 2010/03/23 89 % 30 - 130 D5-Nitrobenzene 2010/03/23 95 % 23- 120 D5-Phenol 2010/03/23 94 % 24- 113 1,2,4-Trichlorobenzene 2010/03/23 86 % 40 - 125 RPD 1,2,4-Trichlorobenzene 2010/03/23 16.9 % 50 Spiked Blank 1,4-Dichlorobenzene 2010/03/23 87 % 40 - 125 RPD 1,4-Dichlorobenzene 2010/03/23 4.5 % 50 Spiked Blank 2,4-Dinitrotoluene 2010/03/23 100 % 40 - 125 RPD 2,4-Dinitrotoluene 2010/03/23 2.5 % 50 Spiked Blank 2-Chlorophenol 2010/03/23 92 % 10 - 125 RPD 2-Chlorophenol 2010/03/23 5.4 % 50 Spiked Blank 4-Chloro-3-Methylphenol 2010/03/23 100 % 10 - 125 RPD 4-Chloro-3-Methylphenol 2010/03/23 7.3 % 50 Spiked Blank 4-Nitrophenol 2010/03/23 87 % 10 - 125 RPD 4-Nitrophenol 2010/03/23 3.9 % 50 Spiked Blank N-Nitroso-di-n-propylamine 2010/03/23 109 % 40 - 125 RPD N-Nitroso-di-n-propylamine 2010/03/23 6.7 % 50 Spiked Blank Pentachlorophenol 2010/03/23 70 % 10 - 125 RPD Pentachlorophenol 2010/03/23 22.6 % 50 Spiked Blank Phenol 2010/03/23 91 % 10 - 125 RPD Phenol 2010/03/23 2.4 % 50 Method Blank 2,4,6-Tribromophenol 2010/03/23 39 % 24- 121

2-Fluorobiphenyl 2010/03/23 98 % 30 - 115 2-Fluorophenol 2010/03/23 93 % 30 - 130 D5-Nitrobenzene 2010/03/23 94 % 23- 120 D5-Phenol 2010/03/23 98 % 24- 113 1,2,4-Trichlorobenzene 2010/03/23 ND, RDL=6 ug 1,2-Dichlorobenzene 2010/03/23 ND, RDL=6 ug 1,3-Dichlorobenzene 2010/03/23 ND, RDL=6 ug 1,4-Dichlorobenzene 2010/03/23 ND, RDL=6 ug 2,4,5-Trichlorophenol 2010/03/23 ND, RDL=6 ug 2,4,6-Trichlorophenol 2010/03/23 ND, RDL=5 ug 2,4-Dichlorophenol 2010/03/23 ND, RDL=4 ug 2,4-Dimethylphenol 2010/03/23 ND, RDL=6 ug 2,4-Dinitrophenol 2010/03/23 ND, RDL=10 ug 2,4-Dinitrotoluene 2010/03/23 ND, RDL=2 ug 2,6-Dinitrotoluene 2010/03/23 ND, RDL=3 ug 2-Chloronaphthalene 2010/03/23 ND, RDL=3 ug 2-Chlorophenol 2010/03/23 ND, RDL=8 ug 2-Methylphenol 2010/03/23 ND, RDL=9 ug 2-Nitroaniline 2010/03/23 ND, RDL=20 ug 2-Nitrophenol 2010/03/23 ND, RDL=5 ug 3 & 4-methylphenol 2010/03/23 ND, RDL=10 ug 3,3'-Dichlorobenzidine 2010/03/23 ND, RDL=8 ug 3-Nitroaniline 2010/03/23 ND, RDL=20 ug 4,6-Dinitro-2-methylphenol 2010/03/23 ND, RDL=10 ug 4-Bromophenyl phenyl ether 2010/03/23 ND, RDL=2 ug 4-Chloro-3-Methylphenol 2010/03/23 ND, RDL=5 ug

Page 15 of 16

### Eagle Mountain Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG-ENERGY-VIENNA8 

### Quality AssuranceReport

(Continued) Maxxam Job Number: GB026989
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2097422 WZ Method Blank 4-Chloroaniline 2010/03/23 ND, RDL=20 ug 4-Chlorophenyl phenyl ether 2010/03/23 ND, RDL=3 ug 4-Nitroaniline 2010/03/23 ND, RDL=20 ug 4-Nitrophenol 2010/03/23 ND, RDL=10 ug Aniline 2010/03/23 ND, RDL=20 ug Benzidine 2010/03/23 ND, RDL=60 ug Benzoic Acid 2010/03/23 ND, RDL=10 ug Benzyl Alcohol 2010/03/23 ND, RDL=6 ug Benzyl butyl phthalate 2010/03/23 ND, RDL=2 ug Bis(2-chloroethoxy)methane 2010/03/23 ND, RDL=4 ug Bis(2-chloroethyl)ether 2010/03/23 ND, RDL=5 ug Bis(2-chloroisopropyl)ether 2010/03/23 ND, RDL=5 ug Bis(2-ethylhexyl)phthalate 2010/03/23 12, RDL=8 ug Carbazole 2010/03/23 ND, RDL=20 ug Dibenzofuran 2010/03/23 ND, RDL=20 ug Diethyl phthalate 2010/03/23 ND, RDL=3 ug Dimethyl phthalate 2010/03/23 ND, RDL=3 ug Di-N-butyl phthalate 2010/03/23 ND, RDL=3 ug Di-N-octyl phthalate 2010/03/23 ND, RDL=3 ug Hexachlorobenzene 2010/03/23 ND, RDL=6 ug Hexachlorobutadiene 2010/03/23 ND, RDL=6 ug Hexachlorocyclopentadiene 2010/03/23 ND, RDL=6 ug Hexachloroethane 2010/03/23 ND, RDL=6 ug Isophorone 2010/03/23 ND, RDL=10 ug Nitrobenzene 2010/03/23 ND, RDL=6 ug N-Nitrosodimethylamine 2010/03/23 ND, RDL=30 ug N-Nitroso-di-n-propylamine 2010/03/23 ND, RDL=6 ug N-Nitrosodiphenylamine 2010/03/23 ND, RDL=6 ug Pentachlorophenol 2010/03/23 ND, RDL=9 ug Phenol 2010/03/23 ND, RDL=5 ug Duplicate: Paired analysis ofa separate portion ofthe same sample. Used to evaluate the variance in the measurement. Spiked Blank: Ablankmatrixto which aknown amountofthe analyte has been added. Used to evaluate analyte recovery. Method Blank: Ablankmatrixcontaining all reagents used in the analytical procedure. Used to identifylaboratorycontamination. Surrogate: Apure orisotopicallylabeled compound whose behaviormirrors the analytes ofinterest. Used to evaluate extraction efficiency.

Page 16 of 16

### Your Project #: 902637 Site:NRGENERGY,INC.VIENNA PLANT Your C.O.C. #: n/a

Attention: Mark

Carlson Eagle Mountain 8905 Autumn OaksDr. Rockford, MN USA 55373

Report Date: 2010/03/16 

## CERTIFICATE

OF ANALYSIS
MAXXAMJOB#: B025190 Received: 2010/03/03,09:53 SampleMatrix: SAMPLING TRAIN #SamplesReceived: 4

Date Date Method Analyses Quantity Extracted Analyzed LaboratoryMethod Reference Hydrogen Halides in H2SO4 Imp. ( 1 ) 4 2010/03/11 2010/03/11 BRL SOP-00108 EPA Method 26A Volume of Sulfuric Acid Impinger 4 N/A 2010/03/11

(1) This testwas performed in Maxxam Mississauga underMaxxam Burlington SCC Accreditation



### Encryption

Key

Please direct all questions regarding this Certificate ofAnalysis to yourProject Manager.
CLAYTON JOHNSON, Project Manager Email: Clayton.Johnson@maxxamanalytics.com Phone#(905) 817-5769

==================================================================== Maxxam has procedures in place to guard againstimproperuse ofthe electronicsignature and have the required "signatories", as persection 5.10.2 ofISO/IEC 17025:2005(E), signing the reports. SCC and CALAhave approved this reporting process and electronicreportformat.

Total coverpages: 1

Page 1 of 5

### Eagle Mountain Maxxam Job #: B025190 Client Project #: 902637 Report Date: 2010/03/16 Projectname: NRG ENERGY, INC. VIENNAPLANT



### RESULTS OF ANALYSES OF SAMPLING TRAIN

Maxxam ID F F 6 3 8 2 F

F 6 3 8 3 F

F 6 3 8 4 F

F 6 3 8 5 Sampling Date 2010/02/24 2010/02/24 2010/02/24 2010/02/24 COC Number n/a n/a n/a U n i t s 7-BLANK-VIENNA 1-HCL-VIENNA 3-HCL-VIENNA 5-HCL-VIENNA RDL QC Batch

8 8-TEST1 8-TEST2 8-TEST3

Volume ml 250 450 470 460 1 2098419 Miscellaneous Parameters Hydrochloric Acid ug <200 5600 5800 5700 200 2098421 Hydrofluoric Acid ug <200 1100 980 930 200 2098421
N/A= Not Applicable RDL= Reportable Detection Limit QC Batch = QualityControl Batch

Page 2 of 5

### Eagle Mountain Maxxam Job #: B025190 Client Project #: 902637 Report Date: 2010/03/16 Projectname: NRG ENERGY, INC. VIENNAPLANT



### Test Summary

Maxxam ID FF6382 Collected 2010/02/24 Sample ID 7-BLANK-VIENNA 8 Shipped Matrix SAMPLING TRAIN Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Hydrogen Halides in H2SO4 Imp. IC/SPEC 2098421 2010/03/11 2010/03/11 A_S Volume of Sulfuric Acid Impinger 2098419 N/A 2010/03/11 A_S

Maxxam ID FF6383 Collected 2010/02/24 Sample ID 1-HCL-VIENNA8-TEST1 Shipped Matrix SAMPLING TRAIN Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Hydrogen Halides in H2SO4 Imp. IC/SPEC 2098421 2010/03/11 2010/03/11 A_S Volume of Sulfuric Acid Impinger 2098419 N/A 2010/03/11 A_S

Maxxam ID FF6384 Collected 2010/02/24 Sample ID 3-HCL-VIENNA8-TEST2 Shipped Matrix SAMPLING TRAIN Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Hydrogen Halides in H2SO4 Imp. IC/SPEC 2098421 2010/03/11 2010/03/11 A_S Volume of Sulfuric Acid Impinger 2098419 N/A 2010/03/11 A_S

Maxxam ID FF6384D u p Collected 2010/02/24 Sample ID 3-HCL-VIENNA8-TEST2 Shipped Matrix SAMPLING TRAIN Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Hydrogen Halides in H2SO4 Imp. IC/SPEC 2098421 2010/03/11 2010/03/11 A_S

Maxxam ID FF6385 Collected 2010/02/24 Sample ID 5-HCL-VIENNA8-TEST3 Shipped Matrix SAMPLING TRAIN Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Hydrogen Halides in H2SO4 Imp. IC/SPEC 2098421 2010/03/11 2010/03/11 A_S Volume of Sulfuric Acid Impinger 2098419 N/A 2010/03/11 A_S

Page 3 of 5

### Eagle Mountain Maxxam Job #: B025190 Client Project #: 902637 Report Date: 2010/03/16 Projectname: NRG ENERGY, INC. VIENNAPLANT

GENERAL COMMENTS

Results relateonlytotheitems tested.

Page 4 of 5

### Eagle Mountain Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG ENERGY, INC. VIENNAPLANT 

### Quality AssuranceReport Maxxam Job Number: GB025190
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2098421 A_S MatrixSpike

(FF6384) Hydrochloric Acid 2010/03/11 104 % 80 - 120

Hydrofluoric Acid 2010/03/11 102 % 80 - 120 Spiked Blank Hydrochloric Acid 2010/03/11 97 % 90 - 110

Hydrofluoric Acid 2010/03/11 102 % 90 - 110 Method Blank Hydrochloric Acid 2010/03/11 ND, RDL=200 ug

Hydrofluoric Acid 2010/03/11 ND, RDL=200 ug RPD - Sample/Sample Dup Hydrochloric Acid 2010/03/11 1.5 % 20

Hydrofluoric Acid 2010/03/11 NC % 20
MatrixSpike: Asample to which a known amountofthe analyte ofinteresthas been added. Used to evaluate sample matrixinterference. Spiked Blank: Ablankmatrixto which aknown amountofthe analyte has been added. Used to evaluate analyte recovery. Method Blank: Ablankmatrixcontaining all reagents used in the analytical procedure. Used to identifylaboratorycontamination. NC (RPD): The RPD was notcalculated. The level ofanalyte detected in the parentsample and its duplicate was notsufficientlysignificantto permita reliable calculation.

Page 5 of 5

### Your Project #: 902637 Site:NRGENERGY

VIENNA PLANT Your C.O.C. #: N/A

Attention: Mark

Carlson Eagle Mountain 8905 Autumn OaksDr. Rockford, MN USA 55373

Report Date: 2010/03/17 

## CERTIFICATE

OF ANALYSIS
MAXXAMJOB#: B026176 Received: 2010/03/03,20:30 SampleMatrix: Stack

Sampling Train #SamplesReceived: 4

Date Date Method Analyses Quantity Extracted Analyzed LaboratoryMethod Reference Cyanide in Impingers 4 2010/03/16 2010/03/16 EPA CTM-33 Volume ofSodium Hydroxide Impinger 4 N/A 2010/03/17



### Encryption

Key

Please direct all questions regarding this Certificate ofAnalysis to yourProject Manager.
CLAYTON JOHNSON, Project Manager Email: Clayton.Johnson@maxxamanalytics.com Phone#(905) 817-5769

==================================================================== Maxxam has procedures in place to guard againstimproperuse ofthe electronicsignature and have the required "signatories", as persection 5.10.2 ofISO/IEC 17025:2005(E), signing the reports. SCC and CALAhave approved this reporting process and electronicreportformat.

Total coverpages: 1

Page 1 of 5

### Eagle Mountain Maxxam Job #: B026176 Client Project #: 902637 Report Date: 2010/03/17 Projectname: NRG ENERGYVIENNAPLANT



### RESULTS OF ANALYSES OF STACKSAMPLING TRAIN

Maxxam ID F G 0 8 9 6 F

G 0 8 9 7 F

G 0 8 9 8 F

G 0 8 9 9 Sampling Date 2010/02/24 2010/02/24 2010/02/24 2010/02/24 COC Number N/A N/A N/A N/A

U n i t s 7-BLANK RDL 1-RUN 3-RUN RDL 5-RUN RDL QC Batch 1-HCN 2-HCN 3-HCN

Volume ml 110 1 680 690 1 760 1 2101298 Inorganics Cyanide(CN) ug <10 10 <70 <70 70 <500 500 2101693
N/A= Not Applicable RDL= Reportable Detection Limit QC Batch = QualityControl Batch

Page 2 of 5

### Eagle Mountain Maxxam Job #: B026176 Client Project #: 902637 Report Date: 2010/03/17 Projectname: NRG ENERGYVIENNAPLANT



### Test Summary

Maxxam ID FG0896 Collected 2010/02/24 Sample ID 7-BLANK Shipped Matrix Stack Sampling Train Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Cyanide in Impingers IC 2101693 2010/03/16 2010/03/16 LLE Volume ofSodium Hydroxide Impinger 2101298 N/A 2010/03/17 LLE

Maxxam ID FG0897 Collected 2010/02/24 Sample ID 1-RUN 1-HCN Shipped Matrix Stack Sampling Train Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Cyanide in Impingers IC 2101693 2010/03/16 2010/03/16 LLE Volume ofSodium Hydroxide Impinger 2101298 N/A 2010/03/17 LLE

Maxxam ID FG0898 Collected 2010/02/24 Sample ID 3-RUN 2-HCN Shipped Matrix Stack Sampling Train Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Cyanide in Impingers IC 2101693 2010/03/16 2010/03/16 LLE Volume ofSodium Hydroxide Impinger 2101298 N/A 2010/03/17 LLE

Maxxam ID FG0898 D u p Collected 2010/02/24 Sample ID 3-RUN 2-HCN Shipped Matrix Stack Sampling Train Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Cyanide in Impingers IC 2101693 2010/03/16 2010/03/16 LLE

Maxxam ID FG0899 Collected 2010/02/24 Sample ID 5-RUN 3-HCN Shipped Matrix Stack Sampling Train Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst Cyanide in Impingers IC 2101693 2010/03/16 2010/03/16 LLE Volume ofSodium Hydroxide Impinger 2101298 N/A 2010/03/17 LLE

Page 3 of 5

### Eagle Mountain Maxxam Job #: B026176 Client Project #: 902637 Report Date: 2010/03/17 Projectname: NRG ENERGYVIENNAPLANT

RESULTSOFANALYSESOFSTACK SAMPLING TRAIN Cyanide in Impingers: Samples are ImproperlyPreserved, pH should be greaterthan orequal to 12.

Results relateonlytotheitems tested.

Page 4 of 5

### Eagle Mountain Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG ENERGYVIENNAPLANT 

### Quality AssuranceReport Maxxam Job Number: GB026176
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2101693 LLE MatrixSpike

(FG0898) Cyanide(CN) 2010/03/16 96 % 80 - 120 Spiked Blank Cyanide(CN) 2010/03/16 94 % 90 - 110 Method Blank Cyanide(CN) 2010/03/16 ND, RDL=10 ug RPD - Sample/Sample Dup Cyanide(CN) 2010/03/16 NC % 20
MatrixSpike: Asample to which a known amountofthe analyte ofinteresthas been added. Used to evaluate sample matrixinterference. Spiked Blank: Ablankmatrixto which aknown amountofthe analyte has been added. Used to evaluate analyte recovery. Method Blank: Ablankmatrixcontaining all reagents used in the analytical procedure. Used to identifylaboratorycontamination. NC (RPD): The RPD was notcalculated. The level ofanalyte detected in the parentsample and its duplicate was notsufficientlysignificantto permita reliable calculation.

Page 5 of 5

### Your Project #: 902637 Site:NRGENERGY

INC.VIENNA

PLANT Your C.O.C. #: N/A

Attention: Mark

Carlson Eagle Mountain 8905 Autumn OaksDr. Rockford, MN USA 55373

Report Date: 2010/03/15 

## CERTIFICATE

OF ANALYSIS
MAXXAMJOB#: B025871 Received: 2010/03/03,20:30 SampleMatrix: AIR #SamplesReceived: 13

Date Date Method Analyses Quantity Extracted Analyzed LaboratoryMethod Reference VOST Analysis (5041mod) 8 N/A 2010/03/05 BRL SOP-00302 EPA 5041mod(M0030) VOST Analysis (5041mod) 5 N/A 2010/03/08 BRL SOP-00302 EPA 5041mod(M0030)


### Sample Matrix: Water #SamplesReceived: 3

Date Date Method Analyses Quantity Extracted Analyzed LaboratoryMethod Reference VOST Condensate (8260Cmod) 3 N/A 2010/03/09 BRL SOP-00305 EPA 8260Cmod(M0030)



### Encryption

Key

Please direct all questions regarding this Certificate ofAnalysis to yourProject Manager.
CLAYTON JOHNSON, Project Manager Email: Clayton.Johnson@maxxamanalytics.com Phone#(905) 817-5769

==================================================================== Maxxam has procedures in place to guard againstimproperuse ofthe electronicsignature and have the required "signatories", as persection 5.10.2 ofISO/IEC 17025:2005(E), signing the reports. SCC and CALAhave approved this reporting process and electronicreportformat.

Total coverpages: 1

Page 1 of 25

### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT



### VOLATILE ORGANICS BYGC/MS (AIR)

Maxxam ID F F 9 6 2 9 F F 9 6 3 1 F

F 9 6 3 2 Sampling Date 2010/02/24 2010/02/24 2010/02/24 COC Number N/A N/A N/A U n i t s R1A-M0031-FC2006 RDL R1B-M0031-FC1992 R1C-M0031-FC1987 RDL QC Batch

Volatile Organics Dichlorodifluoromethane (FREON 12) ug <0.02 0.02 <0.02 <0.02 0.02 2094877 Chloromethane ug <0.02 0.02 <0.02 <0.02 0.02 2094877 Vinyl Chloride ug <0.01 0.01 <0.01 <0.01 0.01 2094877 Bromomethane ug 0.15 0.02 0.14 0.07 0.02 2094877 Chloroethane ug <0.009 0.009 <0.009 <0.009 0.009 2094877 Trichlorofluoromethane (FREON 11) ug 0.02 0.01 <0.01 <0.01 0.01 2094877 Acetone (2-Propanone) ug 1.10 0.05 0.17 0.23 0.05 2094877 1,1-Dichloroethylene ug <0.01 0.01 <0.01 <0.01 0.01 2094877 Iodomethane ug 0.04 0.02 <0.02 <0.02 0.02 2094877 Carbon Disulfide ug <0.03 0.03 <0.03 <0.03 0.03 2094877 Methylene Chloride(Dichloromethane) ug 0.98 0.02 0.05 0.08 0.02 2094877 1,1-Dichloroethane ug <0.01 0.01 <0.01 <0.01 0.01 2094877 trans-1,2-Dichloroethylene ug <0.01 0.01 <0.01 <0.01 0.01 2094877 cis-1,2-Dichloroethylene ug <0.01 0.01 <0.01 <0.01 0.01 2094877 Chloroform ug <0.01 0.01 <0.01 <0.01 0.01 2094877 1,2-Dichloroethane ug <0.03 0.03 <0.02 <0.02 0.02 2094877 Methyl Ethyl Ketone (2-Butanone) ug 0.13 0.04 <0.04 <0.04 0.04 2094877 1,1,1-Trichloroethane ug <0.01 0.01 <0.01 <0.01 0.01 2094877 Carbon Tetrachloride ug <0.02 0.02 <0.02 <0.02 0.02 2094877 Benzene ug 0.935 0.009 0.411 0.367 0.009 2094877 1,1,2-Trichloroethane ug <0.02 0.02 <0.02 <0.02 0.02 2094877 1,2-Dichloropropane ug <0.01 0.01 <0.01 <0.01 0.01 2094877 Trichloroethylene ug <0.01 0.01 <0.01 <0.01 0.01 2094877 Dibromomethane ug <0.01 0.01 <0.01 <0.01 0.01 2094877 Bromodichloromethane ug <0.01 0.01 <0.01 <0.01 0.01 2094877 cis-1,3-Dichloropropene ug <0.01 0.01 <0.01 <0.01 0.01 2094877 trans-1,3-Dichloropropene ug <0.007 0.007 <0.007 <0.007 0.007 2094877 Dibromochloromethane ug <0.009 0.009 <0.009 <0.009 0.009 2094877 Methyl Isobutyl Ketone ug 0.02 0.02 <0.02 <0.02 0.02 2094877 Methyl Butyl Ketone (2-Hexanone) ug 0.05 0.03 <0.03 <0.03 0.03 2094877 Toluene ug 0.73 0.01 0.21 0.19 0.01 2094877 Ethylene Dibromide ug <0.01 0.01 <0.01 <0.01 0.01 2094877
N/A= Not Applicable RDL= Reportable Detection Limit QC Batch = QualityControl Batch

Page 2 of 25

### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT



### VOLATILE ORGANICS BYGC/MS (AIR)

Maxxam ID F F 9 6 2 9 F F 9 6 3 1 F

F 9 6 3 2 Sampling Date 2010/02/24 2010/02/24 2010/02/24 COC Number N/A N/A N/A U n i t s R1A-M0031-FC2006 RDL R1B-M0031-FC1992 R1C-M0031-FC1987 RDL QC Batch Tetrachloroethylene ug <0.02 0.02 <0.02 <0.02 0.02 2094877 Chlorobenzene ug <0.01 0.01 <0.01 <0.01 0.01 2094877 1,1,1,2-Tetrachloroethane ug <0.01 0.01 <0.01 <0.01 0.01 2094877 Ethylbenzene ug 0.02 0.01 <0.01 <0.01 0.01 2094877

m / p-Xylene ug 0.08 0.02 <0.02 0.02 0.02 2094877 Styrene ug <0.01 0.01 <0.01 <0.01 0.01 2094877 o-Xylene ug 0.02 0.02 <0.02 <0.02 0.02 2094877 Bromoform ug <0.01 0.01 <0.01 <0.01 0.01 2094877 1,1,2,2-Tetrachloroethane ug <0.01 0.01 <0.01 <0.01 0.01 2094877 1,2,3-Trichloropropane ug <0.02 0.02 <0.02 <0.02 0.02 2094877 1,3-Dichlorobenzene ug <0.02 0.02 <0.02 <0.02 0.02 2094877 1,4-Dichlorobenzene ug <0.02 0.02 <0.02 <0.02 0.02 2094877 1,2-Dichlorobenzene ug <0.02 0.02 <0.02 <0.02 0.02 2094877 SurrogateRecovery(%) Bromofluorobenzene % 105 90 79 2094877 D10-Ethylbenzene (FS) % 120 110 109 2094877 D4-1,2-Dichloroethane % 99 97 97 2094877 D8-Toluene % 74 75 73 2094877
N/A= Not Applicable QC Batch = QualityControl Batch

Page 3 of 25

### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT



### VOLATILE ORGANICS BYGC/MS (AIR)

Maxxam ID F F 9 6 3 3 F F 9 6 3 4 F

F 9 6 3 5 Sampling Date 2010/02/24 2010/02/24 2010/02/24 COC Number N/A N/A N/A U n i t s R1D-M0031-FC1990 RDL R2A-M0031-FC1991 R2B-M0031-FC1986 RDL QC Batch

Volatile Organics Dichlorodifluoromethane (FREON 12) ug <0.02 0.02 <0.02 <0.02 0.02 2094877 Chloromethane ug <0.02 0.02 <0.02 <0.02 0.02 2094877 Vinyl Chloride ug <0.01 0.01 <0.01 <0.01 0.01 2094877 Bromomethane ug 0.10 0.02 0.14 0.22 0.02 2094877 Chloroethane ug <0.009 0.009 <0.009 <0.009 0.009 2094877 Trichlorofluoromethane (FREON 11) ug <0.01 0.01 <0.01 <0.01 0.01 2094877 Acetone (2-Propanone) ug 0.10 0.05 0.22 0.12 0.05 2094877 1,1-Dichloroethylene ug <0.01 0.01 <0.01 <0.01 0.01 2094877 Iodomethane ug <0.02 0.02 <0.02 <0.02 0.02 2094877 Carbon Disulfide ug <0.03 0.03 <0.03 <0.03 0.03 2094877 Methylene Chloride(Dichloromethane) ug 0.04 0.02 0.42 0.06 0.02 2094877 1,1-Dichloroethane ug <0.01 0.01 <0.01 <0.01 0.01 2094877 trans-1,2-Dichloroethylene ug <0.01 0.01 <0.01 <0.01 0.01 2094877 cis-1,2-Dichloroethylene ug <0.01 0.01 <0.01 <0.01 0.01 2094877 Chloroform ug <0.01 0.01 <0.01 <0.01 0.01 2094877 1,2-Dichloroethane ug <0.02 0.02 <0.007 <0.007 0.007 2094877 Methyl Ethyl Ketone (2-Butanone) ug <0.04 0.04 <0.04 <0.04 0.04 2094877 1,1,1-Trichloroethane ug <0.01 0.01 <0.01 <0.01 0.01 2094877 Carbon Tetrachloride ug <0.02 0.02 <0.02 <0.02 0.02 2094877 Benzene ug 0.289 0.009 0.689 0.562 0.009 2094877 1,1,2-Trichloroethane ug <0.02 0.02 <0.02 <0.02 0.02 2094877 1,2-Dichloropropane ug <0.01 0.01 <0.01 <0.01 0.01 2094877 Trichloroethylene ug <0.01 0.01 <0.01 <0.01 0.01 2094877 Dibromomethane ug <0.01 0.01 <0.01 <0.01 0.01 2094877 Bromodichloromethane ug <0.01 0.01 <0.01 <0.01 0.01 2094877 cis-1,3-Dichloropropene ug <0.01 0.01 <0.01 <0.01 0.01 2094877 trans-1,3-Dichloropropene ug <0.007 0.007 <0.007 <0.007 0.007 2094877 Dibromochloromethane ug <0.009 0.009 <0.009 <0.009 0.009 2094877 Methyl Isobutyl Ketone ug <0.02 0.02 <0.02 <0.02 0.02 2094877 Methyl Butyl Ketone (2-Hexanone) ug <0.03 0.03 <0.03 <0.03 0.03 2094877 Toluene ug 0.16 0.01 0.27 0.17 0.01 2094877 Ethylene Dibromide ug <0.01 0.01 <0.01 <0.01 0.01 2094877
N/A= Not Applicable RDL= Reportable Detection Limit QC Batch = QualityControl Batch

Page 4 of 25

### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT



### VOLATILE ORGANICS BYGC/MS (AIR)

Maxxam ID F F 9 6 3 3 F F 9 6 3 4 F

F 9 6 3 5 Sampling Date 2010/02/24 2010/02/24 2010/02/24 COC Number N/A N/A N/A U n i t s R1D-M0031-FC1990 RDL R2A-M0031-FC1991 R2B-M0031-FC1986 RDL QC Batch Tetrachloroethylene ug <0.02 0.02 <0.02 <0.02 0.02 2094877 Chlorobenzene ug <0.01 0.01 <0.01 <0.01 0.01 2094877 1,1,1,2-Tetrachloroethane ug <0.01 0.01 <0.01 <0.01 0.01 2094877 Ethylbenzene ug <0.01 0.01 <0.01 <0.01 0.01 2094877

m / p-Xylene ug 0.02 0.02 0.03 0.02 0.02 2094877 Styrene ug <0.01 0.01 <0.01 <0.01 0.01 2094877 o-Xylene ug <0.02 0.02 <0.02 <0.02 0.02 2094877 Bromoform ug <0.01 0.01 <0.01 <0.01 0.01 2094877 1,1,2,2-Tetrachloroethane ug <0.01 0.01 <0.01 <0.01 0.01 2094877 1,2,3-Trichloropropane ug <0.02 0.02 <0.02 <0.02 0.02 2094877 1,3-Dichlorobenzene ug <0.02 0.02 <0.02 <0.02 0.02 2094877 1,4-Dichlorobenzene ug <0.02 0.02 <0.02 <0.02 0.02 2094877 1,2-Dichlorobenzene ug <0.02 0.02 <0.02 <0.02 0.02 2094877 SurrogateRecovery(%) Bromofluorobenzene % 103 107 108 2094877 D10-Ethylbenzene (FS) % 110 128 103 2094877 D4-1,2-Dichloroethane % 97 97 95 2094877 D8-Toluene % 76 75 73 2094877
N/A= Not Applicable QC Batch = QualityControl Batch

Page 5 of 25

### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT



### VOLATILE ORGANICS BYGC/MS (AIR)

Maxxam ID F F 9 6 3 6 F F 9 6 3 7 F

F 9 6 3 8 F

F 9 6 3 9 Sampling Date 2010/02/24 2010/02/24 2010/02/24 2010/02/24 COC Number N/A N/A N/A N/A U n i t s R2C-M0031-FC1988 QC Batch R2D-M0031-FC2005 R3A-M0031-FC2004 R3B-M0031-FC1984 RDL QC Batch

Volatile Organics Dichlorodifluoromethane (FREON 12) ug <0.02 2094877 <0.02 <0.02 <0.02 0.02 2095401 Chloromethane ug <0.02 2094877 0.25 <0.02 <0.02 0.02 2095401 Vinyl Chloride ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 Bromomethane ug 0.05 2094877 0.03 0.08 0.08 0.02 2095401 Chloroethane ug <0.009 2094877 <0.009 <0.009 <0.009 0.009 2095401 Trichlorofluoromethane (FREON 11) ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 Acetone (2-Propanone) ug 0.12 2094877 0.10 0.22 0.14 0.05 2095401 1,1-Dichloroethylene ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 Iodomethane ug <0.02 2094877 <0.02 <0.02 <0.02 0.02 2095401 Carbon Disulfide ug <0.03 2094877 <0.03 <0.03 <0.03 0.03 2095401 Methylene Chloride(Dichloromethane) ug 0.04 2094877 0.03 0.98 0.04 0.02 2095401 1,1-Dichloroethane ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 trans-1,2-Dichloroethylene ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 cis-1,2-Dichloroethylene ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 Chloroform ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 1,2-Dichloroethane ug <0.007 2094877 <0.007 <0.007 <0.007 0.007 2095401 Methyl Ethyl Ketone (2-Butanone) ug <0.04 2094877 <0.04 <0.04 <0.04 0.04 2095401 1,1,1-Trichloroethane ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 Carbon Tetrachloride ug <0.02 2094877 <0.02 <0.02 <0.02 0.02 2095401 Benzene ug 0.417 2094877 0.340 0.261 0.293 0.009 2095401 1,1,2-Trichloroethane ug <0.02 2094877 <0.02 <0.02 <0.02 0.02 2095401 1,2-Dichloropropane ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 Trichloroethylene ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 Dibromomethane ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 Bromodichloromethane ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 cis-1,3-Dichloropropene ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 trans-1,3-Dichloropropene ug <0.007 2094877 <0.007 <0.007 <0.007 0.007 2095401 Dibromochloromethane ug <0.009 2094877 <0.009 <0.009 <0.009 0.009 2095401 Methyl Isobutyl Ketone ug <0.02 2094877 <0.02 <0.02 <0.02 0.02 2095401 Methyl Butyl Ketone (2-Hexanone) ug <0.03 2094877 <0.03 <0.03 <0.03 0.03 2095401 Toluene ug 0.18 2094877 0.21 0.21 0.13 0.01 2095401 Ethylene Dibromide ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401
N/A= Not Applicable RDL = Reportable Detection Limit QC Batch = QualityControl Batch

Page 6 of 25

### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT



### VOLATILE ORGANICS BYGC/MS (AIR)

Maxxam ID F F 9 6 3 6 F F 9 6 3 7 F

F 9 6 3 8 F

F 9 6 3 9 Sampling Date 2010/02/24 2010/02/24 2010/02/24 2010/02/24 COC Number N/A N/A N/A N/A U n i t s R2C-M0031-FC1988 QC Batch R2D-M0031-FC2005 R3A-M0031-FC2004 R3B-M0031-FC1984 RDL QC Batch Tetrachloroethylene ug <0.02 2094877 <0.02 <0.02 <0.02 0.02 2095401 Chlorobenzene ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 1,1,1,2-Tetrachloroethane ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 Ethylbenzene ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401

m / p-Xylene ug 0.03 2094877 0.02 <0.02 <0.02 0.02 2095401 Styrene ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 o-Xylene ug <0.02 2094877 <0.02 <0.02 <0.02 0.02 2095401 Bromoform ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 1,1,2,2-Tetrachloroethane ug <0.01 2094877 <0.01 <0.01 <0.01 0.01 2095401 1,2,3-Trichloropropane ug <0.02 2094877 <0.02 <0.02 <0.02 0.02 2095401 1,3-Dichlorobenzene ug <0.02 2094877 <0.02 <0.02 <0.02 0.02 2095401 1,4-Dichlorobenzene ug <0.02 2094877 <0.02 <0.02 <0.02 0.02 2095401 1,2-Dichlorobenzene ug <0.02 2094877 <0.02 <0.02 <0.02 0.02 2095401 SurrogateRecovery(%) Bromofluorobenzene % 60 2094877 21 ( 1 ) 89 97 2095401 D10-Ethylbenzene (FS) % 106 2094877 102 111 111 2095401 D4-1,2-Dichloroethane % 96 2094877 101 98 98 2095401 D8-Toluene % 74 2094877 73 78 76 2095401
N/A= Not Applicable QC Batch = QualityControl Batch ( 1 ) RecoveryorRPD forthis parameteris outside control limits. The overall qualitycontrol forthis analysis meets acceptabilitycriteria.

Page 7 of 25

### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT



### VOLATILE ORGANICS BYGC/MS (AIR)

Maxxam ID F F 9 6 4 0 F

F 9 6 4 9 Sampling Date 2010/02/24 2010/02/24 COC Number N/A N/A U n i t s R3C-M0031-FC2000 R3D-M0031-FC1983 RDL QC Batch

Volatile Organics Dichlorodifluoromethane (FREON 12) ug <0.02 <0.02 0.02 2095401 Chloromethane ug <0.02 <0.02 0.02 2095401 Vinyl Chloride ug <0.01 <0.01 0.01 2095401 Bromomethane ug 0.10 0.09 0.02 2095401 Chloroethane ug <0.009 <0.009 0.009 2095401 Trichlorofluoromethane (FREON 11) ug <0.01 <0.01 0.01 2095401 Acetone (2-Propanone) ug 0.13 0.14 0.05 2095401 1,1-Dichloroethylene ug <0.01 <0.01 0.01 2095401 Iodomethane ug <0.02 <0.02 0.02 2095401 Carbon Disulfide ug <0.03 <0.03 0.03 2095401 Methylene Chloride(Dichloromethane) ug 0.02 0.08 0.02 2095401 1,1-Dichloroethane ug <0.01 <0.01 0.01 2095401 trans-1,2-Dichloroethylene ug <0.01 <0.01 0.01 2095401 cis-1,2-Dichloroethylene ug <0.01 <0.01 0.01 2095401 Chloroform ug <0.01 <0.01 0.01 2095401 1,2-Dichloroethane ug <0.007 <0.007 0.007 2095401 Methyl Ethyl Ketone (2-Butanone) ug <0.04 <0.04 0.04 2095401 1,1,1-Trichloroethane ug <0.01 <0.01 0.01 2095401 Carbon Tetrachloride ug <0.02 <0.02 0.02 2095401 Benzene ug 0.496 0.747 0.009 2095401 1,1,2-Trichloroethane ug <0.02 <0.02 0.02 2095401 1,2-Dichloropropane ug <0.01 <0.01 0.01 2095401 Trichloroethylene ug <0.01 <0.01 0.01 2095401 Dibromomethane ug <0.01 <0.01 0.01 2095401 Bromodichloromethane ug <0.01 <0.01 0.01 2095401 cis-1,3-Dichloropropene ug <0.01 <0.01 0.01 2095401 trans-1,3-Dichloropropene ug <0.007 <0.007 0.007 2095401 Dibromochloromethane ug <0.009 <0.009 0.009 2095401 Methyl Isobutyl Ketone ug <0.02 <0.02 0.02 2095401 Methyl Butyl Ketone (2-Hexanone) ug <0.03 <0.03 0.03 2095401 Toluene ug 0.10 0.24 0.01 2095401 Ethylene Dibromide ug <0.01 <0.01 0.01 2095401
N/A= Not Applicable RDL= Reportable Detection Limit QC Batch = QualityControl Batch

Page 8 of 25

### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT



### VOLATILE ORGANICS BYGC/MS (AIR)

Maxxam ID F F 9 6 4 0 F

F 9 6 4 9 Sampling Date 2010/02/24 2010/02/24 COC Number N/A N/A U n i t s R3C-M0031-FC2000 R3D-M0031-FC1983 RDL QC Batch Tetrachloroethylene ug <0.02 <0.02 0.02 2095401 Chlorobenzene ug <0.01 <0.01 0.01 2095401 1,1,1,2-Tetrachloroethane ug <0.01 <0.01 0.01 2095401 Ethylbenzene ug <0.01 <0.01 0.01 2095401

m / p-Xylene ug <0.02 0.05 0.02 2095401 Styrene ug <0.01 <0.01 0.01 2095401 o-Xylene ug <0.02 <0.02 0.02 2095401 Bromoform ug <0.01 <0.01 0.01 2095401 1,1,2,2-Tetrachloroethane ug <0.01 <0.01 0.01 2095401 1,2,3-Trichloropropane ug <0.02 <0.02 0.02 2095401 1,3-Dichlorobenzene ug <0.02 <0.02 0.02 2095401 1,4-Dichlorobenzene ug <0.02 <0.02 0.02 2095401 1,2-Dichlorobenzene ug <0.02 <0.02 0.02 2095401 SurrogateRecovery(%) Bromofluorobenzene % 34( 1 ) 35 (

1 ) 2095401 D10-Ethylbenzene (FS) % 112 104 2095401 D4-1,2-Dichloroethane % 101 98 2095401 D8-Toluene % 73 65 ( 1 ) 2095401
N/A= Not Applicable QC Batch = QualityControl Batch ( 1 ) RecoveryorRPD forthis parameteris outside control limits. The overall qualitycontrol forthis analysis meets acceptability criteria.

Page 9 of 25

### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT



### VOLATILE ORGANICS BYGC/MS (AIR)

Maxxam ID F F 9 6 6 4 Sampling Date 2010/02/24 COC Number N/A U n i t s BLANK-M0031-FC1989 RDL QC Batch

Volatile Organics Dichlorodifluoromethane (FREON 12) ug <0.02 0.02 2094877 Chloromethane ug <0.02 0.02 2094877 Vinyl Chloride ug <0.01 0.01 2094877 Bromomethane ug <0.02 0.02 2094877 Chloroethane ug <0.009 0.009 2094877 Trichlorofluoromethane (FREON 11) ug <0.01 0.01 2094877 Acetone (2-Propanone) ug <0.05 0.05 2094877 1,1-Dichloroethylene ug <0.01 0.01 2094877 Iodomethane ug <0.02 0.02 2094877 Carbon Disulfide ug <0.03 0.03 2094877 Methylene Chloride(Dichloromethane) ug 0.03 0.02 2094877 1,1-Dichloroethane ug <0.01 0.01 2094877 trans-1,2-Dichloroethylene ug <0.01 0.01 2094877 cis-1,2-Dichloroethylene ug <0.01 0.01 2094877 Chloroform ug <0.01 0.01 2094877 1,2-Dichloroethane ug <0.007 0.007 2094877 Methyl Ethyl Ketone (2-Butanone) ug <0.04 0.04 2094877 1,1,1-Trichloroethane ug <0.01 0.01 2094877 Carbon Tetrachloride ug <0.02 0.02 2094877 Benzene ug <0.009 0.009 2094877 1,1,2-Trichloroethane ug <0.02 0.02 2094877 1,2-Dichloropropane ug <0.01 0.01 2094877 Trichloroethylene ug <0.01 0.01 2094877 Dibromomethane ug <0.01 0.01 2094877 Bromodichloromethane ug <0.01 0.01 2094877 cis-1,3-Dichloropropene ug <0.01 0.01 2094877 trans-1,3-Dichloropropene ug <0.007 0.007 2094877 Dibromochloromethane ug <0.009 0.009 2094877 Methyl Isobutyl Ketone ug <0.02 0.02 2094877 Methyl Butyl Ketone (2-Hexanone) ug <0.03 0.03 2094877 Toluene ug 0.03 0.01 2094877 Ethylene Dibromide ug <0.01 0.01 2094877
N/A= Not Applicable RDL= Reportable Detection Limit QC Batch = QualityControl Batch

Page 10 of 25

### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT



### VOLATILE ORGANICS BYGC/MS (AIR)

Maxxam ID F F 9 6 6 4 Sampling Date 2010/02/24 COC Number N/A U n i t s BLANK-M0031-FC1989 RDL QC Batch Tetrachloroethylene ug <0.02 0.02 2094877 Chlorobenzene ug <0.01 0.01 2094877 1,1,1,2-Tetrachloroethane ug <0.01 0.01 2094877 Ethylbenzene ug <0.01 0.01 2094877

m / p-Xylene ug <0.02 0.02 2094877 Styrene ug <0.01 0.01 2094877 o-Xylene ug <0.02 0.02 2094877 Bromoform ug <0.01 0.01 2094877 1,1,2,2-Tetrachloroethane ug <0.01 0.01 2094877 1,2,3-Trichloropropane ug <0.02 0.02 2094877 1,3-Dichlorobenzene ug <0.02 0.02 2094877 1,4-Dichlorobenzene ug <0.02 0.02 2094877 1,2-Dichlorobenzene ug <0.02 0.02 2094877 SurrogateRecovery(%) Bromofluorobenzene % 93 2094877 D10-Ethylbenzene (FS) % 130 2094877 D4-1,2-Dichloroethane % 102 2094877 D8-Toluene % 103 2094877
N/A= Not Applicable QC Batch = QualityControl Batch

Page 11 of 25

### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT



### VOLATILE ORGANICS BY GC/MS (WATER)

Maxxam ID F F 9 6 2 6 F

F 9 6 2 7 Sampling Date 2010/02/24 2010/02/24 COC Number N/A N/A U n i t s 1-CONDENSATE-1 RDL 2-CONDENSATE-2 RDL QC Batch

Volatile Organics Dichlorodifluoromethane (FREON 12) ug/L <10 10 <13 13 2093299 Chloromethane ug/L <20 20 <26 26 2093299 Vinyl Chloride ug/L <4.0 4.0 <5.2 5.2 2093299 Bromomethane ug/L <30 30 <39 39 2093299 Chloroethane ug/L <10 10 <13 13 2093299 Trichlorofluoromethane (FREON 11) ug/L <20 20 <26 26 2093299 Acetone (2-Propanone) ug/L 430 100 430 130 2093299 1,1-Dichloroethylene ug/L <10 10 <13 13 2093299 Iodomethane ug/L <6.0 6.0 <7.8 7.8 2093299 Carbon Disulfide ug/L <5.0 5.0 <6.5 6.5 2093299 Methylene Chloride(Dichloromethane) ug/L 550 10 750 13 2093299 1,1-Dichloroethane ug/L <4.0 4.0 <5.2 5.2 2093299 trans-1,2-Dichloroethylene ug/L <10 10 <13 13 2093299 cis-1,2-Dichloroethylene ug/L <10 10 <13 13 2093299 Chloroform ug/L <4.0 4.0 <5.2 5.2 2093299 1,2-Dichloroethane ug/L <5.0 5.0 <6.5 6.5 2093299 Methyl Ethyl Ketone (2-Butanone) ug/L <100 100 <130 130 2093299 1,1,1-Trichloroethane ug/L <5.0 5.0 <6.5 6.5 2093299 Carbon Tetrachloride ug/L <5.0 5.0 <6.5 6.5 2093299 Benzene ug/L <5.0 5.0 <6.5 6.5 2093299 1,1,2-Trichloroethane ug/L <5.0 5.0 <6.5 6.5 2093299 1,2-Dichloropropane ug/L <5.0 5.0 <6.5 6.5 2093299 Trichloroethylene ug/L <5.0 5.0 <6.5 6.5 2093299 Dibromomethane ug/L <5.0 5.0 <6.5 6.5 2093299 Bromodichloromethane ug/L <4.0 4.0 <5.2 5.2 2093299 cis-1,3-Dichloropropene ug/L <4.0 4.0 <5.2 5.2 2093299 trans-1,3-Dichloropropene ug/L <6.0 6.0 <7.8 7.8 2093299 Dibromochloromethane ug/L <4.0 4.0 <5.2 5.2 2093299 Methyl Isobutyl Ketone ug/L <50 50 <65 65 2093299 Methyl Butyl Ketone (2-Hexanone) ug/L <50 50 <65 65 2093299 Toluene ug/L 14 5.0 21 6.5 2093299 Ethylene Dibromide ug/L <5.0 5.0 <6.5 6.5 2093299
N/A= Not Applicable RDL= Reportable Detection Limit QC Batch = QualityControl Batch

Page 12 of 25

### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT



### VOLATILE ORGANICS BY GC/MS (WATER)

Maxxam ID F F 9 6 2 6 F

F 9 6 2 7 Sampling Date 2010/02/24 2010/02/24 COC Number N/A N/A U n i t s 1-CONDENSATE-1 RDL 2-CONDENSATE-2 RDL QC Batch Tetrachloroethylene ug/L <5.0 5.0 <6.5 6.5 2093299 Chlorobenzene ug/L <5.0 5.0 <6.5 6.5 2093299 1,1,1,2-Tetrachloroethane ug/L <5.0 5.0 <6.5 6.5 2093299 Ethylbenzene ug/L <5.0 5.0 <6.5 6.5 2093299 p+m-Xylene ug/L <5.0 5.0 <6.5 6.5 2093299 Styrene ug/L <5.0 5.0 <6.5 6.5 2093299 o-Xylene ug/L <5.0 5.0 <6.5 6.5 2093299 Bromoform ug/L <4.0 4.0 <5.2 5.2 2093299 1,1,2,2-Tetrachloroethane ug/L <20 20 <26 26 2093299 1,2,3-Trichloropropane ug/L <6.0 6.0 <7.8 7.8 2093299 1,3-Dichlorobenzene ug/L <5.0 5.0 <6.5 6.5 2093299 1,4-Dichlorobenzene ug/L <5.0 5.0 <6.5 6.5 2093299 1,2-Dichlorobenzene ug/L <5.0 5.0 <6.5 6.5 2093299 SurrogateRecovery(%) 4-Bromofluorobenzene % 91 91 2093299 D4-1,2-Dichloroethane % 102 106 2093299 D8-Toluene % 104 105 2093299
N/A= Not Applicable QC Batch = QualityControl Batch

Page 13 of 25

### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT



### VOLATILE ORGANICS BY GC/MS (WATER)

Maxxam ID F F 9 6 2 8 Sampling Date 2010/02/24 COC Number N/A U n i t s 3-CONDENSATE-3 RDL QC Batch

Volatile Organics Dichlorodifluoromethane (FREON 12) ug/L <11 11 2093299 Chloromethane ug/L <22 22 2093299 Vinyl Chloride ug/L <4.4 4.4 2093299 Bromomethane ug/L <33 33 2093299 Chloroethane ug/L <11 11 2093299 Trichlorofluoromethane (FREON 11) ug/L <22 22 2093299 Acetone (2-Propanone) ug/L 430 110 2093299 1,1-Dichloroethylene ug/L <11 11 2093299 Iodomethane ug/L <6.6 6.6 2093299 Carbon Disulfide ug/L <5.5 5.5 2093299 Methylene Chloride(Dichloromethane) ug/L 890 11 2093299 1,1-Dichloroethane ug/L <4.4 4.4 2093299 trans-1,2-Dichloroethylene ug/L <11 11 2093299 cis-1,2-Dichloroethylene ug/L <11 11 2093299 Chloroform ug/L <4.4 4.4 2093299 1,2-Dichloroethane ug/L <5.5 5.5 2093299 Methyl Ethyl Ketone (2-Butanone) ug/L <110 110 2093299 1,1,1-Trichloroethane ug/L <5.5 5.5 2093299 Carbon Tetrachloride ug/L <5.5 5.5 2093299 Benzene ug/L <5.5 5.5 2093299 1,1,2-Trichloroethane ug/L <5.5 5.5 2093299 1,2-Dichloropropane ug/L <5.5 5.5 2093299 Trichloroethylene ug/L <5.5 5.5 2093299 Dibromomethane ug/L <5.5 5.5 2093299 Bromodichloromethane ug/L <4.4 4.4 2093299 cis-1,3-Dichloropropene ug/L <4.4 4.4 2093299 trans-1,3-Dichloropropene ug/L <6.6 6.6 2093299 Dibromochloromethane ug/L <4.4 4.4 2093299 Methyl Isobutyl Ketone ug/L <55 55 2093299 Methyl Butyl Ketone (2-Hexanone) ug/L <55 55 2093299 Toluene ug/L 21 5.5 2093299 Ethylene Dibromide ug/L <5.5 5.5 2093299
N/A= Not Applicable RDL= Reportable Detection Limit QC Batch = QualityControl Batch

Page 14 of 25

### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT



### VOLATILE ORGANICS BY GC/MS (WATER)

Maxxam ID F F 9 6 2 8 Sampling Date 2010/02/24 COC Number N/A U n i t s 3-CONDENSATE-3 RDL QC Batch Tetrachloroethylene ug/L <5.5 5.5 2093299 Chlorobenzene ug/L <5.5 5.5 2093299 1,1,1,2-Tetrachloroethane ug/L <5.5 5.5 2093299 Ethylbenzene ug/L <5.5 5.5 2093299 p+m-Xylene ug/L <5.5 5.5 2093299 Styrene ug/L <5.5 5.5 2093299 o-Xylene ug/L <5.5 5.5 2093299 Bromoform ug/L <4.4 4.4 2093299 1,1,2,2-Tetrachloroethane ug/L <22 22 2093299 1,2,3-Trichloropropane ug/L <6.6 6.6 2093299 1,3-Dichlorobenzene ug/L <5.5 5.5 2093299 1,4-Dichlorobenzene ug/L <5.5 5.5 2093299 1,2-Dichlorobenzene ug/L <5.5 5.5 2093299 SurrogateRecovery(%) 4-Bromofluorobenzene % 92 2093299 D4-1,2-Dichloroethane % 118 2093299 D8-Toluene % 103 2093299
N/A= Not Applicable QC Batch = QualityControl Batch

Page 15 of 25

### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT



### Test Summary

Maxxam ID FF9626 Collected 2010/02/24 Sample ID 1-CONDENSATE-1 Shipped Matrix Water Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst VOST Condensate (8260Cmod) P&T/MS 2093299 N/A 2010/03/09 AGE

Maxxam ID FF9627 Collected 2010/02/24 Sample ID 2-CONDENSATE-2 Shipped Matrix Water Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst VOST Condensate (8260Cmod) P&T/MS 2093299 N/A 2010/03/09 AGE

Maxxam ID FF9628 Collected 2010/02/24 Sample ID 3-CONDENSATE-3 Shipped Matrix Water Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst VOST Condensate (8260Cmod) P&T/MS 2093299 N/A 2010/03/09 AGE

Maxxam ID FF9629 Collected 2010/02/24 Sample ID R1A-M0031-FC2006 Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst VOST Analysis (5041mod) GC/MS 2094877 N/A 2010/03/05 YYA

Maxxam ID FF9631 Collected 2010/02/24 Sample ID R1B-M0031-FC1992 Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst VOST Analysis (5041mod) GC/MS 2094877 N/A 2010/03/05 YYA

Maxxam ID FF9632 Collected 2010/02/24 Sample ID R1C-M0031-FC1987 Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst VOST Analysis (5041mod) GC/MS 2094877 N/A 2010/03/05 YYA

Maxxam ID FF9633 Collected 2010/02/24 Sample ID R1D-M0031-FC1990 Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst VOST Analysis (5041mod) GC/MS 2094877 N/A 2010/03/05 YYA

Page 16 of 25

### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT



### Test Summary

Maxxam ID FF9634 Collected 2010/02/24 Sample ID R2A-M0031-FC1991 Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst VOST Analysis (5041mod) GC/MS 2094877 N/A 2010/03/05 YYA

Maxxam ID FF9635 Collected 2010/02/24 Sample ID R2B-M0031-FC1986 Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst VOST Analysis (5041mod) GC/MS 2094877 N/A 2010/03/05 YYA

Maxxam ID FF9636 Collected 2010/02/24 Sample ID R2C-M0031-FC1988 Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst VOST Analysis (5041mod) GC/MS 2094877 N/A 2010/03/05 YYA

Maxxam ID FF9637 Collected 2010/02/24 Sample ID R2D-M0031-FC2005 Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst VOST Analysis (5041mod) GC/MS 2095401 N/A 2010/03/08 YYA

Maxxam ID FF9638 Collected 2010/02/24 Sample ID R3A-M0031-FC2004 Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst VOST Analysis (5041mod) GC/MS 2095401 N/A 2010/03/08 YYA

Maxxam ID FF9639 Collected 2010/02/24 Sample ID R3B-M0031-FC1984 Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst VOST Analysis (5041mod) GC/MS 2095401 N/A 2010/03/08 YYA

Maxxam ID FF9640 Collected 2010/02/24 Sample ID R3C-M0031-FC2000 Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst VOST Analysis (5041mod) GC/MS 2095401 N/A 2010/03/08 YYA

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### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT



### Test Summary

Maxxam ID FF9649 Collected 2010/02/24 Sample ID R3D-M0031-FC1983 Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst VOST Analysis (5041mod) GC/MS 2095401 N/A 2010/03/08 YYA

Maxxam ID FF9664 Collected 2010/02/24 Sample ID BLANK-M0031-FC1989 Shipped Matrix AIR Received 2010/03/03
TestDescription Instrumentation Batch Extracted Analyzed Analyst VOST Analysis (5041mod) GC/MS 2094877 N/A 2010/03/05 YYA

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### Eagle Mountain Maxxam Job #: B025871 Client Project #: 902637 Report Date: 2010/03/15 Projectname: NRG ENERGYINC. VIENNAPLANT

GENERAL COMMENTS
VOCVOSTM-A: WS#2094877 In continuing calibration Std., dichlorodifluoromethane, chloromethane and acetone were belowacceptance limit. In reference Std., dichlorodifluoromethane was below acceptance limit.
WS#2095401 In continuing calibration std., chloroethane and iodomethane exceed acceptance limit. Area% ofacetone was belowacceptance limit.
VOC Analysis: Due to high concentrations oftarget analytes, aftervolume made up to 43.0mL samples required subsequent dilution. Detection limits were adjusted accordingly. Sample FF9626-01: VOC Analysis: Volume ofsample received 22.0mL. Final volume 43.0mL. Initial dilution factor2.0 Sample FF9627-01: VOC Analysis: Volume ofsample received 32.3mL. Final volume 43.0mL. Initial dilution factor1.3 Sample FF9628-01: VOC Analysis: Volume ofsample received 38.0mL. Final volume 43.0mL. Initial dilution factor1.1. Sample FF9629-01: Acetone is overthe calibration range. Data should be considered an estimate only. Raised DLfor1,2-dichloroethane due to interference. Sample FF9631-01: Raised DLfor1,2-dichloroethane due to interference. Sample FF9632-01: Raised DLfor1,2-dichloroethane due to interference. Sample FF9633-01: Raised DLfor1,2-dichloroethane due to interference. Sample FF9637-01: 4-Bromofluorobenzene surrogate recoverywas belowacceptance limitdue to interference ofhigh concentration of non-target compounds. Othersurrogates recoveries were acceptable. Sample FF9640-01: 4-Bromofluorobenzene surrogate recoverywas belowacceptance limitdue to interference ofhigh concentration of non-target compounds. Othersurrogates recoveries were acceptable. Sample FF9649-01: 4-Bromofluorobenzene and d8-toluene surrogate recoveries were belowacceptance limitdue to interference ofhigh concentration of non-target compounds.

Results relateonlytotheitems tested.

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### Eagle Mountain Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG ENERGYINC. VIENNAPLANT 

### Quality AssuranceReport Maxxam Job Number: GB025871
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2093299 AGE Spiked Blank 4-Bromofluorobenzene 2010/03/09 101 % 76 - 120 D4-1,2-Dichloroethane 2010/03/09 96 % 67- 122 D8-Toluene 2010/03/09 99 % 75 - 114 Dichlorodifluoromethane (FREON 12) 2010/03/09 91 % 60 - 140 Chloromethane 2010/03/09 98 % 60 - 140 Vinyl Chloride 2010/03/09 97 % 70 - 130 Bromomethane 2010/03/09 99 % 60 - 140 Chloroethane 2010/03/09 98 % 70 - 130 Trichlorofluoromethane (FREON 11) 2010/03/09 96 % 70 - 130 Acetone (2-Propanone) 2010/03/09 89 % 60 - 140 1,1-Dichloroethylene 2010/03/09 105 % 70 - 130 Iodomethane 2010/03/09 108 % N/A Carbon Disulfide 2010/03/09 122 % N/A Methylene Chloride(Dichloromethane) 2010/03/09 104 % 70 - 130 1,1-Dichloroethane 2010/03/09 99 % 70 - 130 trans-1,2-Dichloroethylene 2010/03/09 102 % 70 - 130 cis-1,2-Dichloroethylene 2010/03/09 99 % 70 - 130 Chloroform 2010/03/09 98 % 70 - 130 1,2-Dichloroethane 2010/03/09 98 % 70 - 130 Methyl Ethyl Ketone (2-Butanone) 2010/03/09 94 % 60 - 140 1,1,1-Trichloroethane 2010/03/09 98 % 70 - 130 Carbon Tetrachloride 2010/03/09 105 % 70 - 130 Benzene 2010/03/09 103 % 70 - 130 1,1,2-Trichloroethane 2010/03/09 93 % 70 - 130 1,2-Dichloropropane 2010/03/09 107 % 70 - 130 Trichloroethylene 2010/03/09 98 % 70 - 130 Dibromomethane 2010/03/09 98 % N/A Bromodichloromethane 2010/03/09 99 % 70 - 130 cis-1,3-Dichloropropene 2010/03/09 102 % 70 - 130 trans-1,3-Dichloropropene 2010/03/09 100 % 70 - 130 Dibromochloromethane 2010/03/09 100 % 70 - 130 Methyl Isobutyl Ketone 2010/03/09 105 % 70 - 130 Methyl Butyl Ketone (2-Hexanone) 2010/03/09 102 % N/A Toluene 2010/03/09 99 % 70 - 130 Ethylene Dibromide 2010/03/09 102 % 70 - 130 Tetrachloroethylene 2010/03/09 97 % 70 - 130 Chlorobenzene 2010/03/09 98 % 70 - 130 1,1,1,2-Tetrachloroethane 2010/03/09 100 % 70 - 130 Ethylbenzene 2010/03/09 101 % 70 - 130 p+m-Xylene 2010/03/09 99 % 70 - 130 Styrene 2010/03/09 108 % 70 - 130 o-Xylene 2010/03/09 96 % 70 - 130 Bromoform 2010/03/09 84 % 70 - 130 1,1,2,2-Tetrachloroethane 2010/03/09 98 % 70 - 130 1,2,3-Trichloropropane 2010/03/09 89 % N/A 1,3-Dichlorobenzene 2010/03/09 99 % 70 - 130 1,4-Dichlorobenzene 2010/03/09 99 % 70 - 130 1,2-Dichlorobenzene 2010/03/09 99 % 70 - 130 Method Blank 4-Bromofluorobenzene 2010/03/09 92 % 76 - 120

D4-1,2-Dichloroethane 2010/03/09 94 % 67- 122 D8-Toluene 2010/03/09 105 % 75 - 114 Dichlorodifluoromethane (FREON 12) 2010/03/09 ND, RDL=1.0 ug/L Chloromethane 2010/03/09 ND, RDL=2.0 ug/L Vinyl Chloride 2010/03/09 ND, RDL=0.40 ug/L Bromomethane 2010/03/09 ND, RDL=3.0 ug/L

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### Eagle Mountain Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG ENERGYINC. VIENNAPLANT 

### Quality AssuranceReport

(Continued) Maxxam Job Number: GB025871
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2093299 AGE Method Blank Chloroethane 2010/03/09 ND, RDL=1.0 ug/L Trichlorofluoromethane (FREON 11) 2010/03/09 ND, RDL=2.0 ug/L Acetone (2-Propanone) 2010/03/09 ND, RDL=10 ug/L 1,1-Dichloroethylene 2010/03/09 ND, RDL=1.0 ug/L Iodomethane 2010/03/09 ND, RDL=0.60 ug/L Carbon Disulfide 2010/03/09 ND, RDL=0.50 ug/L Methylene Chloride(Dichloromethane) 2010/03/09 ND, RDL=1.0 ug/L 1,1-Dichloroethane 2010/03/09 ND, RDL=0.40 ug/L trans-1,2-Dichloroethylene 2010/03/09 ND, RDL=1.0 ug/L cis-1,2-Dichloroethylene 2010/03/09 ND, RDL=1.0 ug/L Chloroform 2010/03/09 ND, RDL=0.40 ug/L 1,2-Dichloroethane 2010/03/09 ND, RDL=0.50 ug/L Methyl Ethyl Ketone (2-Butanone) 2010/03/09 ND, RDL=10 ug/L 1,1,1-Trichloroethane 2010/03/09 ND, RDL=0.50 ug/L Carbon Tetrachloride 2010/03/09 ND, RDL=0.50 ug/L Benzene 2010/03/09 ND, RDL=0.50 ug/L 1,1,2-Trichloroethane 2010/03/09 ND, RDL=0.50 ug/L 1,2-Dichloropropane 2010/03/09 ND, RDL=0.50 ug/L Trichloroethylene 2010/03/09 ND, RDL=0.50 ug/L Dibromomethane 2010/03/09 ND, RDL=0.50 ug/L Bromodichloromethane 2010/03/09 ND, RDL=0.40 ug/L cis-1,3-Dichloropropene 2010/03/09 ND, RDL=0.40 ug/L trans-1,3-Dichloropropene 2010/03/09 ND, RDL=0.60 ug/L Dibromochloromethane 2010/03/09 ND, RDL=0.40 ug/L Methyl Isobutyl Ketone 2010/03/09 ND, RDL=5.0 ug/L Methyl Butyl Ketone (2-Hexanone) 2010/03/09 ND, RDL=5.0 ug/L Toluene 2010/03/09 ND, RDL=0.50 ug/L Ethylene Dibromide 2010/03/09 ND, RDL=0.50 ug/L Tetrachloroethylene 2010/03/09 ND, RDL=0.50 ug/L Chlorobenzene 2010/03/09 ND, RDL=0.50 ug/L 1,1,1,2-Tetrachloroethane 2010/03/09 ND, RDL=0.50 ug/L Ethylbenzene 2010/03/09 ND, RDL=0.50 ug/L p+m-Xylene 2010/03/09 ND, RDL=0.50 ug/L Styrene 2010/03/09 ND, RDL=0.50 ug/L o-Xylene 2010/03/09 ND, RDL=0.50 ug/L Bromoform 2010/03/09 ND, RDL=0.40 ug/L 1,1,2,2-Tetrachloroethane 2010/03/09 ND, RDL=2.0 ug/L 1,2,3-Trichloropropane 2010/03/09 ND, RDL=0.60 ug/L 1,3-Dichlorobenzene 2010/03/09 ND, RDL=0.50 ug/L 1,4-Dichlorobenzene 2010/03/09 ND, RDL=0.50 ug/L 1,2-Dichlorobenzene 2010/03/09 ND, RDL=0.50 ug/L 2094877 YYA Spiked Blank Bromofluorobenzene 2010/03/05 98 % 57- 118 D10-Ethylbenzene (FS) 2010/03/05 101 % 21 - 192 D4-1,2-Dichloroethane 2010/03/05 98 % 22 - 159 D8-Toluene 2010/03/05 101 % 67- 125 Dichlorodifluoromethane (FREON 12) 2010/03/05 35 ( 1 ) % 50 - 150 Chloromethane 2010/03/05 61 % 50 - 150 Vinyl Chloride 2010/03/05 76 % 50 - 150 Bromomethane 2010/03/05 102 % 50 - 150 Chloroethane 2010/03/05 83 % 50 - 150 Trichlorofluoromethane (FREON 11) 2010/03/05 83 % 50 - 150 Acetone (2-Propanone) 2010/03/05 51 % 50 - 150 1,1-Dichloroethylene 2010/03/05 85 % 50 - 150 Iodomethane 2010/03/05 132 % N/A Carbon Disulfide 2010/03/05 77 % 50 - 150

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### Eagle Mountain Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG ENERGYINC. VIENNAPLANT 

### Quality AssuranceReport

(Continued) Maxxam Job Number: GB025871
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2094877 YYA Spiked Blank Methylene Chloride(Dichloromethane) 2010/03/05 92 % 50 - 150 1,1-Dichloroethane 2010/03/05 92 % 50 - 150 trans-1,2-Dichloroethylene 2010/03/05 88 % 50 - 150 cis-1,2-Dichloroethylene 2010/03/05 97 % 50 - 150 Chloroform 2010/03/05 95 % 50 - 150 1,2-Dichloroethane 2010/03/05 92 % 50 - 150 Methyl Ethyl Ketone (2-Butanone) 2010/03/05 74 % 50 - 150 1,1,1-Trichloroethane 2010/03/05 94 % 50 - 150 Carbon Tetrachloride 2010/03/05 96 % 50 - 150 Benzene 2010/03/05 95 % 50 - 150 1,1,2-Trichloroethane 2010/03/05 98 % 50 - 150 1,2-Dichloropropane 2010/03/05 97 % 50 - 150 Trichloroethylene 2010/03/05 92 % 50 - 150 Dibromomethane 2010/03/05 94 % 50 - 150 Bromodichloromethane 2010/03/05 97 % 50 - 150 cis-1,3-Dichloropropene 2010/03/05 101 % 50 - 150 trans-1,3-Dichloropropene 2010/03/05 109 % 50 - 150 Dibromochloromethane 2010/03/05 101 % 50 - 150 Methyl Isobutyl Ketone 2010/03/05 94 % 50 - 150 Methyl Butyl Ketone (2-Hexanone) 2010/03/05 101 % 50 - 150 Toluene 2010/03/05 98 % 50 - 150 Ethylene Dibromide 2010/03/05 97 % 50 - 150 Tetrachloroethylene 2010/03/05 98 % 50 - 150 Chlorobenzene 2010/03/05 97 % 50 - 150 1,1,1,2-Tetrachloroethane 2010/03/05 102 % 50 - 150 Ethylbenzene 2010/03/05 97 % 50 - 150 m / p-Xylene 2010/03/05 98 % 50 - 150 Styrene 2010/03/05 100 % 50 - 150 o-Xylene 2010/03/05 98 % 50 - 150 Bromoform 2010/03/05 105 % 50 - 150 1,1,2,2-Tetrachloroethane 2010/03/05 106 % 50 - 150 1,2,3-Trichloropropane 2010/03/05 90 % 50 - 150 1,3-Dichlorobenzene 2010/03/05 99 % 50 - 150 1,4-Dichlorobenzene 2010/03/05 100 % 50 - 150 1,2-Dichlorobenzene 2010/03/05 98 % 50 - 150 Method Blank Bromofluorobenzene 2010/03/05 92 % 57- 118

D10-Ethylbenzene (FS) 2010/03/05 102 % 21 - 192 D4-1,2-Dichloroethane 2010/03/05 100 % 22 - 159 D8-Toluene 2010/03/05 102 % 67- 125 Dichlorodifluoromethane (FREON 12) 2010/03/05 ND, RDL=0.02 ug Chloromethane 2010/03/05 ND, RDL=0.02 ug Vinyl Chloride 2010/03/05 ND, RDL=0.01 ug Bromomethane 2010/03/05 ND, RDL=0.02 ug Chloroethane 2010/03/05 ND, RDL=0.009 ug Trichlorofluoromethane (FREON 11) 2010/03/05 ND, RDL=0.01 ug Acetone (2-Propanone) 2010/03/05 ND, RDL=0.05 ug 1,1-Dichloroethylene 2010/03/05 ND, RDL=0.01 ug Iodomethane 2010/03/05 ND, RDL=0.02 ug Carbon Disulfide 2010/03/05 ND, RDL=0.03 ug Methylene Chloride(Dichloromethane) 2010/03/05 ND, RDL=0.02 ug 1,1-Dichloroethane 2010/03/05 ND, RDL=0.01 ug trans-1,2-Dichloroethylene 2010/03/05 ND, RDL=0.01 ug cis-1,2-Dichloroethylene 2010/03/05 ND, RDL=0.01 ug Chloroform 2010/03/05 ND, RDL=0.01 ug 1,2-Dichloroethane 2010/03/05 ND, RDL=0.007 ug

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### Eagle Mountain Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG ENERGYINC. VIENNAPLANT 

### Quality AssuranceReport

(Continued) Maxxam Job Number: GB025871
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2094877 YYA Method Blank Methyl Ethyl Ketone (2-Butanone) 2010/03/05 ND, RDL=0.04 ug 1,1,1-Trichloroethane 2010/03/05 ND, RDL=0.01 ug Carbon Tetrachloride 2010/03/05 ND, RDL=0.02 ug Benzene 2010/03/05 ND, RDL=0.009 ug 1,1,2-Trichloroethane 2010/03/05 ND, RDL=0.02 ug 1,2-Dichloropropane 2010/03/05 ND, RDL=0.01 ug Trichloroethylene 2010/03/05 ND, RDL=0.01 ug Dibromomethane 2010/03/05 ND, RDL=0.01 ug Bromodichloromethane 2010/03/05 ND, RDL=0.01 ug cis-1,3-Dichloropropene 2010/03/05 ND, RDL=0.01 ug trans-1,3-Dichloropropene 2010/03/05 ND, RDL=0.007 ug Dibromochloromethane 2010/03/05 ND, RDL=0.009 ug Methyl Isobutyl Ketone 2010/03/05 ND, RDL=0.02 ug Methyl Butyl Ketone (2-Hexanone) 2010/03/05 ND, RDL=0.03 ug Toluene 2010/03/05 ND, RDL=0.01 ug Ethylene Dibromide 2010/03/05 ND, RDL=0.01 ug Tetrachloroethylene 2010/03/05 ND, RDL=0.02 ug Chlorobenzene 2010/03/05 ND, RDL=0.01 ug 1,1,1,2-Tetrachloroethane 2010/03/05 ND, RDL=0.01 ug Ethylbenzene 2010/03/05 ND, RDL=0.01 ug m / p-Xylene 2010/03/05 ND, RDL=0.02 ug Styrene 2010/03/05 ND, RDL=0.01 ug o-Xylene 2010/03/05 ND, RDL=0.02 ug Bromoform 2010/03/05 ND, RDL=0.01 ug 1,1,2,2-Tetrachloroethane 2010/03/05 ND, RDL=0.01 ug 1,2,3-Trichloropropane 2010/03/05 ND, RDL=0.02 ug 1,3-Dichlorobenzene 2010/03/05 ND, RDL=0.02 ug 1,4-Dichlorobenzene 2010/03/05 ND, RDL=0.02 ug 1,2-Dichlorobenzene 2010/03/05 ND, RDL=0.02 ug 2095401 YYA Spiked Blank Bromofluorobenzene 2010/03/08 92 % 57- 118 D10-Ethylbenzene (FS) 2010/03/08 110 % 21 - 192 D4-1,2-Dichloroethane 2010/03/08 102 % 22 - 159 D8-Toluene 2010/03/08 101 % 67- 125 Dichlorodifluoromethane (FREON 12) 2010/03/08 106 % 50 - 150 Chloromethane 2010/03/08 113 % 50 - 150 Vinyl Chloride 2010/03/08 124 % 50 - 150 Bromomethane 2010/03/08 138 % 50 - 150 Chloroethane 2010/03/08 115 % 50 - 150 Trichlorofluoromethane (FREON 11) 2010/03/08 121 % 50 - 150 Acetone (2-Propanone) 2010/03/08 71 % 50 - 150 1,1-Dichloroethylene 2010/03/08 109 % 50 - 150 Iodomethane 2010/03/08 137 % N/A Carbon Disulfide 2010/03/08 100 % 50 - 150 Methylene Chloride(Dichloromethane) 2010/03/08 99 % 50 - 150 1,1-Dichloroethane 2010/03/08 101 % 50 - 150 trans-1,2-Dichloroethylene 2010/03/08 98 % 50 - 150 cis-1,2-Dichloroethylene 2010/03/08 108 % 50 - 150 Chloroform 2010/03/08 101 % 50 - 150 1,2-Dichloroethane 2010/03/08 101 % 50 - 150 Methyl Ethyl Ketone (2-Butanone) 2010/03/08 91 % 50 - 150 1,1,1-Trichloroethane 2010/03/08 100 % 50 - 150 Carbon Tetrachloride 2010/03/08 109 % 50 - 150 Benzene 2010/03/08 101 % 50 - 150 1,1,2-Trichloroethane 2010/03/08 98 % 50 - 150 1,2-Dichloropropane 2010/03/08 104 % 50 - 150

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### Eagle Mountain Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG ENERGYINC. VIENNAPLANT 

### Quality AssuranceReport

(Continued) Maxxam Job Number: GB025871
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2095401 YYA Spiked Blank Trichloroethylene 2010/03/08 94 % 50 - 150 Dibromomethane 2010/03/08 93 % 50 - 150 Bromodichloromethane 2010/03/08 103 % 50 - 150 cis-1,3-Dichloropropene 2010/03/08 106 % 50 - 150 trans-1,3-Dichloropropene 2010/03/08 110 % 50 - 150 Dibromochloromethane 2010/03/08 102 % 50 - 150 Methyl Isobutyl Ketone 2010/03/08 115 % 50 - 150 Methyl Butyl Ketone (2-Hexanone) 2010/03/08 118 % 50 - 150 Toluene 2010/03/08 100 % 50 - 150 Ethylene Dibromide 2010/03/08 97 % 50 - 150 Tetrachloroethylene 2010/03/08 96 % 50 - 150 Chlorobenzene 2010/03/08 99 % 50 - 150 1,1,1,2-Tetrachloroethane 2010/03/08 103 % 50 - 150 Ethylbenzene 2010/03/08 100 % 50 - 150 m / p-Xylene 2010/03/08 104 % 50 - 150 Styrene 2010/03/08 101 % 50 - 150 o-Xylene 2010/03/08 105 % 50 - 150 Bromoform 2010/03/08 104 % 50 - 150 1,1,2,2-Tetrachloroethane 2010/03/08 115 % 50 - 150 1,2,3-Trichloropropane 2010/03/08 96 % 50 - 150 1,3-Dichlorobenzene 2010/03/08 102 % 50 - 150 1,4-Dichlorobenzene 2010/03/08 101 % 50 - 150 1,2-Dichlorobenzene 2010/03/08 101 % 50 - 150 Method Blank Bromofluorobenzene 2010/03/08 86 % 57- 118

D10-Ethylbenzene (FS) 2010/03/08 105 % 21 - 192 D4-1,2-Dichloroethane 2010/03/08 103 % 22 - 159 D8-Toluene 2010/03/08 104 % 67- 125 Dichlorodifluoromethane (FREON 12) 2010/03/08 ND, RDL=0.02 ug Chloromethane 2010/03/08 ND, RDL=0.02 ug Vinyl Chloride 2010/03/08 ND, RDL=0.01 ug Bromomethane 2010/03/08 ND, RDL=0.02 ug Chloroethane 2010/03/08 ND, RDL=0.009 ug Trichlorofluoromethane (FREON 11) 2010/03/08 ND, RDL=0.01 ug Acetone (2-Propanone) 2010/03/08 ND, RDL=0.05 ug 1,1-Dichloroethylene 2010/03/08 ND, RDL=0.01 ug Iodomethane 2010/03/08 ND, RDL=0.02 ug Carbon Disulfide 2010/03/08 ND, RDL=0.03 ug Methylene Chloride(Dichloromethane) 2010/03/08 ND, RDL=0.02 ug 1,1-Dichloroethane 2010/03/08 ND, RDL=0.01 ug trans-1,2-Dichloroethylene 2010/03/08 ND, RDL=0.01 ug cis-1,2-Dichloroethylene 2010/03/08 ND, RDL=0.01 ug Chloroform 2010/03/08 ND, RDL=0.01 ug 1,2-Dichloroethane 2010/03/08 ND, RDL=0.007 ug Methyl Ethyl Ketone (2-Butanone) 2010/03/08 ND, RDL=0.04 ug 1,1,1-Trichloroethane 2010/03/08 ND, RDL=0.01 ug Carbon Tetrachloride 2010/03/08 ND, RDL=0.02 ug Benzene 2010/03/08 ND, RDL=0.009 ug 1,1,2-Trichloroethane 2010/03/08 ND, RDL=0.02 ug 1,2-Dichloropropane 2010/03/08 ND, RDL=0.01 ug Trichloroethylene 2010/03/08 ND, RDL=0.01 ug Dibromomethane 2010/03/08 ND, RDL=0.01 ug Bromodichloromethane 2010/03/08 ND, RDL=0.01 ug cis-1,3-Dichloropropene 2010/03/08 ND, RDL=0.01 ug trans-1,3-Dichloropropene 2010/03/08 ND, RDL=0.007 ug Dibromochloromethane 2010/03/08 ND, RDL=0.009 ug

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### Eagle Mountain Attention: Mark Carlson Client Project #: 902637 P.O. #: Projectname: NRG ENERGYINC. VIENNAPLANT 

### Quality AssuranceReport

(Continued) Maxxam Job Number: GB025871
QA/QC Date Batch Analyzed Num Init QC Type Parameter yyyy/mm/dd Value %Recovery Units QC Limits 2095401 YYA Method Blank Methyl Isobutyl Ketone 2010/03/08 ND, RDL=0.02 ug Methyl Butyl Ketone (2-Hexanone) 2010/03/08 ND, RDL=0.03 ug Toluene 2010/03/08 ND, RDL=0.01 ug Ethylene Dibromide 2010/03/08 ND, RDL=0.01 ug Tetrachloroethylene 2010/03/08 ND, RDL=0.02 ug Chlorobenzene 2010/03/08 ND, RDL=0.01 ug 1,1,1,2-Tetrachloroethane 2010/03/08 ND, RDL=0.01 ug Ethylbenzene 2010/03/08 ND, RDL=0.01 ug m / p-Xylene 2010/03/08 ND, RDL=0.02 ug Styrene 2010/03/08 ND, RDL=0.01 ug o-Xylene 2010/03/08 ND, RDL=0.02 ug Bromoform 2010/03/08 ND, RDL=0.01 ug 1,1,2,2-Tetrachloroethane 2010/03/08 ND, RDL=0.01 ug 1,2,3-Trichloropropane 2010/03/08 ND, RDL=0.02 ug 1,3-Dichlorobenzene 2010/03/08 ND, RDL=0.02 ug 1,4-Dichlorobenzene 2010/03/08 ND, RDL=0.02 ug 1,2-Dichlorobenzene 2010/03/08 ND, RDL=0.02 ug Spiked Blank: Ablankmatrixto which aknown amountofthe analyte has been added. Used to evaluate analyte recovery. Method Blank: Ablankmatrixcontaining all reagents used in the analytical procedure. Used to identifylaboratorycontamination. Surrogate: Apure orisotopicallylabeled compound whose behaviormirrors the analytes ofinterest. Used to evaluate extraction efficiency. ( 1 ) RecoveryorRPD forthis parameteris outside control limits. The overall qualitycontrol forthis analysis meets acceptabilitycriteria.

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