### April 23, 2010

Vista Project I.D.: 32542
Mr. Kevin Donahoe The Avogadro Group, LLC 3003SW 153rd Drive Suite 215 Beaverton,OR 97006
Dear Mr. Donahoe, Enclosed are the results for the four MM5 samples received at Vista Analytical Laboratory on March 30, 2010under your Project Name "TransAlta Centralia". These samples were extracted and analyzed using EPA Method 23for tetra-through-octa chlorinated dioxins and furans andEPA Method 1668for PCB homologue totals and the World Health Organization's list of dioxin-like PCB congeners. A standard turnaround time was provided for this work. The PCB results flagged with an asterisk include a sample-specific detection limit in the "RL" column. Detection limits were calculated for non-detected toxic congeners. All other congeners are reported to the Reporting Limit (RL), which corresponds to the low-point in the initial calibration curve. The following report consists of a Sample Inventory (Section I), Analytical Results (Section II) and the Appendix, which contains the chain-of-custody, a list of data qualifiers and abbreviations, Vista's current certifications, and copies of the raw data (if requested). Vista Analytical Laboratory is committed to serving you effectively. If you require additional information, please contact me at 916-673-1520 or by email at mmaier@vista-analytical.com. Thank you for choosing Vista as part of your analytical support team. Sincerely,

Martha M. Maier Laboratory Director

Vista Analytical Laboratory certifies that the report herein meets all the requirements set forth by NELAC for those applicable test methods. Results relate only to the samples as received by the laboratory. This report should not be reproduced except in full without the written approval of Vista Analytical Laboratory.

### Project No.:

Lab. Sample ID Client Sample ID 32542 

### Project Name: TransAlta Centralia 3/30/2010 

### Section I: Sample Inventory Report
Date Received:

Component ID 001 1-PCDD-1 Fraction 1a- Filter Fraction 1b-XAD Fraction 2-Acetone, MeCl2 Fraction 3-Toluene 002 2-PCDD-1 Fraction 1a- Filter Fraction 1b-XAD Fraction 2-Acetone, MeCl2 Fraction 3-Toluene 003 3-PCDD-1 Fraction 1a- Filter Fraction 1b-XAD Fraction 2-Acetone, MeCl2 Fraction 3-Toluene 004 RB-PCDD-1 Fraction 1a- Filter Fraction 1b-XAD Fraction 2-Acetone, MeCl2 Fraction 3-Toluene

Smpinvgnmm5.rpt

### SECTION II

### EPA Method 23

Method Blank

Matrix: Sample Size: Lab Sample: QC Batch No.:
Date Extracted: MM5 7-Apr-10 Sample 0-MB001 Date Analyzed DB-5: 15-Apr-10 Date Analyzed DB-225: NA 2924

Qualifiers DL Analyte Labeled Standard %R LCL-UCLQualifiers EMPCb d (pg/Sample) a Conc. 2,3,7,8-TCDD ND 5.16 96.9 40 - 130 IS 13C-2,3,7,8-TCDD 1,2,3,7,8-PeCDD ND 7.37 98.1 40 - 130 13C-1,2,3,7,8-PeCDD 1,2,3,4,7,8-HxCDD ND 11.4 91.1 40 - 130 13C-1,2,3,6,7,8-HxCDD 1,2,3,6,7,8-HxCDD ND 10.6 82.8 25 - 130 13C-1,2,3,4,6,7,8-HpCDD 1,2,3,7,8,9-HxCDD ND 10.4 80.7 25 - 130 13C-OCDD 1,2,3,4,6,7,8-HpCDD ND 13.3 93.4 40 - 130 13C-2,3,7,8-TCDF OCDD ND 15.7 95.0 40 - 130 13C-1,2,3,7,8-PeCDF 2,3,7,8-TCDF ND 6.80 81.6 40 - 130 13C-1,2,3,6,7,8-HxCDF 1,2,3,7,8-PeCDF ND 10.5 83.9 25 - 130 13C-1,2,3,4,6,7,8-HpCDF 2,3,4,7,8-PeCDF ND 10.9 73.2 25 - 130 13C-OCDF 1,2,3,4,7,8-HxCDF ND 6.15 95.1 70 - 130 PS 37Cl-2,3,7,8-TCDD 1,2,3,6,7,8-HxCDF ND 5.78 99.9 70 - 130 13C-2,3,4,7,8-PeCDF 2,3,4,6,7,8-HxCDF ND 6.26 99.9 70 - 130 13C-1,2,3,4,7,8-HxCDD 1,2,3,7,8,9-HxCDF ND 7.36 101 70 - 130 13C-1,2,3,4,7,8-HxCDF 1,2,3,4,6,7,8-HpCDF ND 7.72 90.5 70 - 130 13C-1,2,3,4,7,8,9-HpCDF 1,2,3,4,7,8,9-HpCDF ND 9.31 82.6 40 - 130 AS13C-1,2,3,7,8,9-HxCDF OCDF ND 22.6 Totals Toxic Equivalent Quotient (TEQ) Data e
Total TCDD ND 5.15 0 - 22.9 TEQ (Min-Max): Total PeCDD ND 7.37 Total HxCDD ND 10.8 a. Sample specific estimated detection limit. Total HpCDD ND 13.3 b. Estimated maximum possible concentration. Total TCDF ND 6.79 c. Method detection limit. Total PeCDF ND 10.7 d. Lower control limit - upper control limit. Total HxCDF ND 6.35 e. TEQ based on (2005) World Health Organization Toxic Equivalent Factors.(WHO) Total HpCDF ND 8.46
Approved By: Analyst: WJL Martha M. Maier 16-Apr-2010 15:19

### EPA Method 23

OPR Results

Matrix: Sample Sample Size: MM5 2924 QC Batch No.:

Date Extracted: 7-Apr-10 Lab Sample: 0-OPR001 Date Analyzed DB-5: 15-Apr-10 Date Analyzed DB-225: NA

Conc. (ng/mL) Analyte Labeled Standard %R LCL-UCL Spike Conc. OPR Limits Qualifier 2,3,7,8-TCDD 2.23 95.8 40 - 130 IS 2.50 1.75 - 3.25 13C-2,3,7,8-TCDD 1,2,3,7,8-PeCDD 11.1 95.8 40 - 130 12.5 8.75 - 16.3 13C-1,2,3,7,8-PeCDD 1,2,3,4,7,8-HxCDD 11.7 85.8 40 - 130 12.5 8.75 - 16.3 13C-1,2,3,6,7,8-HxCDD 1,2,3,6,7,8-HxCDD 12.0 90.2 25 - 130 12.5 8.75 - 16.3 13C-1,2,3,4,6,7,8-HpCDD 1,2,3,7,8,9-HxCDD 12.4 76.3 25 - 130 12.5 8.75 - 16.3 13C-OCDD 1,2,3,4,6,7,8-HpCDD 11.3 92.4 40 - 130 12.5 8.75 - 16.3 13C-2,3,7,8-TCDF OCDD 22.8 90.6 40 - 130 25.0 17.5 - 32.5 13C-1,2,3,7,8-PeCDF 2,3,7,8-TCDF 2.26 77.0 40 - 130 2.50 1.75 - 3.25 13C-1,2,3,6,7,8-HxCDF 1,2,3,7,8-PeCDF 11.4 81.9 25 - 130 12.5 8.75 - 16.3 13C-1,2,3,4,6,7,8-HpCDF 2,3,4,7,8-PeCDF 12.1 74.1 25 - 130 12.5 8.75 - 16.3 13C-OCDF 1,2,3,4,7,8-HxCDF 12.3 78.8 40 - 130 AS 12.5 8.75 - 16.3 13C-1,2,3,7,8,9-HxCDF 1,2,3,6,7,8-HxCDF 13.0 12.5 8.75 - 16.3 2,3,4,6,7,8-HxCDF 12.6 12.5 8.75 - 16.3 1,2,3,7,8,9-HxCDF 12.2 12.5 8.75 - 16.3 1,2,3,4,6,7,8-HpCDF 11.8 12.5 8.75 - 16.3 1,2,3,4,7,8,9-HpCDF 11.2 12.5 8.75 - 16.3 OCDF 23.4 25.0 17.5 - 32.5
Analyst:WJL Martha M. Maier 16-Apr-2010 15:19 Approved By:Sample ID: 

### 1-PCDD-1 EPA Method 23

Client Data Name: Project: Date Collected: Sample Data Matrix: Sample Size: Laboratory Data Lab Sample: QC Batch No.: Date Received: Date Extracted: MM5 30-Mar-10 7-Apr-10 23-Mar-10 Sample 32542-001 TransAlta Centralia
Date Analyzed DB-5: 15-Apr-10 Date Analyzed DB-225: NA The Avogadro Group, LLC 2924 Time Collected: NA Qualifiers DL Analyte Labeled Standard %RLCL-UCLQualifiers EMPC a b d (pg/Sample) Conc. 2,3,7,8-TCDD ND 7.39 95.640 - 130 IS 13C-2,3,7,8-TCDD 1,2,3,7,8-PeCDD ND 8.10 95.440 - 130 13C-1,2,3,7,8-PeCDD 1,2,3,4,7,8-HxCDD ND 12.5 85.440 - 130 13C-1,2,3,6,7,8-HxCDD 1,2,3,6,7,8-HxCDD ND 11.7 88.6 25 - 130 13C-1,2,3,4,6,7,8-HpCDD 1,2,3,7,8,9-HxCDD ND 11.4 81.8 25 - 130 13C-OCDD 1,2,3,4,6,7,8-HpCDDND 10.5 92.8 40 - 130 13C-2,3,7,8-TCDF OCDD ND 22.4 96.5 40 - 130 13C-1,2,3,7,8-PeCDF 2,3,7,8-TCDF ND 8.05 82.1 40 - 130 13C-1,2,3,6,7,8-HxCDF 1,2,3,7,8-PeCDF ND 9.75 80.6 25 - 130 13C-1,2,3,4,6,7,8-HpCDF 2,3,4,7,8-PeCDF ND 10.1 76.7 25 - 130 13C-OCDF 1,2,3,4,7,8-HxCDF ND 6.40 94.7 70 - 130 PS37Cl-2,3,7,8-TCDD 1,2,3,6,7,8-HxCDF ND 6.01 98.6 70 - 130 13C-2,3,4,7,8-PeCDF 2,3,4,6,7,8-HxCDF ND 6.51 98.9 70 - 130 13C-1,2,3,4,7,8-HxCDD 1,2,3,7,8,9-HxCDF ND 7.66 101 70 - 130 13C-1,2,3,4,7,8-HxCDF 1,2,3,4,6,7,8-HpCDFND 7.45 98.9 70 - 130 13C-1,2,3,4,7,8,9-HpCDF 1,2,3,4,7,8,9-HpCDFND 8.99 82.240 - 130 AS13C-1,2,3,7,8,9-HxCDF OCDF ND 13.5 Totals Toxic Equivalent Quotient (TEQ) Data e
Total TCDD ND 7.41 0 - 26.1 TEQ (Min-Max): Total PeCDD ND 8.10 a. Sample specific estimated detection limit. Total HxCDD ND 11.9 b. Estimated maximum possible concentration. Total HpCDD ND 10.5
c. Method detection limit. Total TCDF ND 8.06 d. Lower control limit - upper control limit. Total PeCDF ND 9.90 e. TEQ based on (2005) World Health Organization Toxic Equivalent Factors.(WHO) Total HxCDF ND 6.60 Total HpCDF ND 8.15 Martha M. Maier 16-Apr-2010 15:19 Approved By: Analyst:WJLSample ID: 

### 2-PCDD-1 EPA Method 23

Client Data Name: Project: Date Collected: Sample Data Matrix: Sample Size: Laboratory Data Lab Sample: QC Batch No.: Date Received: Date Extracted: MM5 30-Mar-10 7-Apr-10 24-Mar-10 Sample 32542-002 TransAlta Centralia
Date Analyzed DB-5: 15-Apr-10 Date Analyzed DB-225: NA The Avogadro Group, LLC 2924 Time Collected: NA Qualifiers DL Analyte Labeled Standard %RLCL-UCLQualifiers EMPC a b d (pg/Sample) Conc. 2,3,7,8-TCDD ND 6.25 96.7 40 - 130 IS 13C-2,3,7,8-TCDD 1,2,3,7,8-PeCDD ND 8.66 95.7 40 - 130 13C-1,2,3,7,8-PeCDD 1,2,3,4,7,8-HxCDD ND 14.4 90.8 40 - 130 13C-1,2,3,6,7,8-HxCDD 1,2,3,6,7,8-HxCDD ND 13.4 92.9 25 - 130 13C-1,2,3,4,6,7,8-HpCDD 1,2,3,7,8,9-HxCDD ND 13.0 83.0 25 - 130 13C-OCDD 1,2,3,4,6,7,8-HpCDDND 14.5 91.040 - 130 13C-2,3,7,8-TCDF OCDD ND 27.0 95.1 40 - 130 13C-1,2,3,7,8-PeCDF 2,3,7,8-TCDF ND 7.50 83.5 40 - 130 13C-1,2,3,6,7,8-HxCDF 1,2,3,7,8-PeCDF ND 9.69 86.7 25 - 130 13C-1,2,3,4,6,7,8-HpCDF 2,3,4,7,8-PeCDF ND 10.0 77.9 25 - 130 13C-OCDF 1,2,3,4,7,8-HxCDF ND 4.87 97.070 - 130 PS37Cl-2,3,7,8-TCDD 1,2,3,6,7,8-HxCDF ND 4.58 99.3 70 - 130 13C-2,3,4,7,8-PeCDF 2,3,4,6,7,8-HxCDF ND 4.96 106 70 - 130 13C-1,2,3,4,7,8-HxCDD 1,2,3,7,8,9-HxCDF ND 5.83 102 70 - 130 13C-1,2,3,4,7,8-HxCDF 1,2,3,4,6,7,8-HpCDFND 8.23 95.8 70 - 130 13C-1,2,3,4,7,8,9-HpCDF 1,2,3,4,7,8,9-HpCDFND 9.93 85.7 40 - 130 AS13C-1,2,3,7,8,9-HxCDF OCDF ND 25.0 Totals Toxic Equivalent Quotient (TEQ) Data e
Total TCDD ND 6.25 0 - 25.4 TEQ (Min-Max): Total PeCDD ND 8.67 a. Sample specific estimated detection limit. Total HxCDD ND 1.32 b. Estimated maximum possible concentration. Total HpCDD ND 14.5
c. Method detection limit. Total TCDF ND 7.50 d. Lower control limit - upper control limit. Total PeCDF ND 9.85 e. TEQ based on (2005) World Health Organization Toxic Equivalent Factors.(WHO) Total HxCDF ND 5.01 Total HpCDF ND 9.02 Martha M. Maier 16-Apr-2010 15:19 Approved By: Analyst:WJLSample ID: 

### 3-PCDD-1 EPA Method 23

Client Data Name: Project: Date Collected: Sample Data Matrix: Sample Size: Laboratory Data Lab Sample: QC Batch No.: Date Received: Date Extracted: MM5 30-Mar-10 7-Apr-10 25-Mar-10 Sample 32542-003 TransAlta Centralia
Date Analyzed DB-5: 15-Apr-10 Date Analyzed DB-225: NA The Avogadro Group, LLC 2924 Time Collected: NA Qualifiers DL Analyte Labeled Standard %RLCL-UCLQualifiers EMPC a b d (pg/Sample) Conc. 2,3,7,8-TCDD ND 9.29 94.640 - 130 IS 13C-2,3,7,8-TCDD 1,2,3,7,8-PeCDD ND 8.91 98.040 - 130 13C-1,2,3,7,8-PeCDD 1,2,3,4,7,8-HxCDD ND 16.6 91.640 - 130 13C-1,2,3,6,7,8-HxCDD 1,2,3,6,7,8-HxCDD ND 15.5 89.8 25 - 130 13C-1,2,3,4,6,7,8-HpCDD 1,2,3,7,8,9-HxCDD ND 15.1 82.1 25 - 130 13C-OCDD 1,2,3,4,6,7,8-HpCDDND 8.76 93.7 40 - 130 13C-2,3,7,8-TCDF OCDD ND 19.5 95.9 40 - 130 13C-1,2,3,7,8-PeCDF 2,3,7,8-TCDF ND 5.61 84.7 40 - 130 13C-1,2,3,6,7,8-HxCDF 1,2,3,7,8-PeCDF ND 6.80 81.4 25 - 130 13C-1,2,3,4,6,7,8-HpCDF 2,3,4,7,8-PeCDF ND 7.03 78.2 25 - 130 13C-OCDF 1,2,3,4,7,8-HxCDF ND 4.48 96.1 70 - 130 PS37Cl-2,3,7,8-TCDD 1,2,3,6,7,8-HxCDF ND 4.21 100 70 - 130 13C-2,3,4,7,8-PeCDF 2,3,4,6,7,8-HxCDF ND 4.56 105 70 - 130 13C-1,2,3,4,7,8-HxCDD 1,2,3,7,8,9-HxCDF ND 5.37 102 70 - 130 13C-1,2,3,4,7,8-HxCDF 1,2,3,4,6,7,8-HpCDFND 6.32 103 70 - 130 13C-1,2,3,4,7,8,9-HpCDF 1,2,3,4,7,8,9-HpCDFND 7.62 83.9 40 - 130 AS13C-1,2,3,7,8,9-HxCDF OCDF ND 19.7 Totals Toxic Equivalent Quotient (TEQ) Data e
Total TCDD ND 9.30 0 - 27.9 TEQ (Min-Max): Total PeCDD ND 8.92 a. Sample specific estimated detection limit. Total HxCDD ND 15.7 b. Estimated maximum possible concentration. Total HpCDD ND 8.76
c. Method detection limit. Total TCDF ND 5.60 d. Lower control limit - upper control limit. Total PeCDF ND 6.88 e. TEQ based on (2005) World Health Organization Toxic Equivalent Factors.(WHO) Total HxCDF ND 4.61 Total HpCDF ND 6.91 Martha M. Maier 16-Apr-2010 15:19 Approved By: Analyst:WJLSample ID: 

### RB-PCDD-1 EPA Method 23

Client Data Name: Project: Date Collected: Sample Data Matrix: Sample Size: Laboratory Data Lab Sample: QC Batch No.: Date Received: Date Extracted: MM5 30-Mar-10 7-Apr-10 22-Mar-10 Sample 32542-004 TransAlta Centralia
Date Analyzed DB-5: 15-Apr-10 Date Analyzed DB-225: NA The Avogadro Group, LLC 2924 Time Collected: NA Qualifiers DL Analyte Labeled Standard %RLCL-UCLQualifiers EMPC a b d (pg/Sample) Conc. 2,3,7,8-TCDD ND 6.17 92.5 40 - 130 IS 13C-2,3,7,8-TCDD 1,2,3,7,8-PeCDD ND 6.51 93.040 - 130 13C-1,2,3,7,8-PeCDD 1,2,3,4,7,8-HxCDD ND 16.3 87.240 - 130 13C-1,2,3,6,7,8-HxCDD 1,2,3,6,7,8-HxCDD ND 15.2 87.2 25 - 130 13C-1,2,3,4,6,7,8-HpCDD 1,2,3,7,8,9-HxCDD ND 14.8 77.6 25 - 130 13C-OCDD 1,2,3,4,6,7,8-HpCDDND 10.4 87.8 40 - 130 13C-2,3,7,8-TCDF OCDD ND 11.4 90.1 40 - 130 13C-1,2,3,7,8-PeCDF 2,3,7,8-TCDF ND 5.61 80.8 40 - 130 13C-1,2,3,6,7,8-HxCDF 1,2,3,7,8-PeCDF ND 6.85 81.1 25 - 130 13C-1,2,3,4,6,7,8-HpCDF 2,3,4,7,8-PeCDF ND 7.07 78.4 25 - 130 13C-OCDF 1,2,3,4,7,8-HxCDF ND 2.70 96.070 - 130 PS37Cl-2,3,7,8-TCDD 1,2,3,6,7,8-HxCDF ND 2.53 100 70 - 130 13C-2,3,4,7,8-PeCDF 2,3,4,6,7,8-HxCDF ND 2.74 102 70 - 130 13C-1,2,3,4,7,8-HxCDD 1,2,3,7,8,9-HxCDF ND 3.23 102 70 - 130 13C-1,2,3,4,7,8-HxCDF 1,2,3,4,6,7,8-HpCDFND 4.03 96.8 70 - 130 13C-1,2,3,4,7,8,9-HpCDF 1,2,3,4,7,8,9-HpCDFND 4.86 81.3 40 - 130 AS13C-1,2,3,7,8,9-HxCDF OCDF ND 22.3 Totals Toxic Equivalent Quotient (TEQ) Data e
Total TCDD ND 6.19 0 - 21.5 TEQ (Min-Max): Total PeCDD ND 6.51 a. Sample specific estimated detection limit. Total HxCDD ND 15.4 b. Estimated maximum possible concentration. Total HpCDD ND 10.4
c. Method detection limit. Total TCDF ND 5.62 d. Lower control limit - upper control limit. Total PeCDF ND 6.95 e. TEQ based on (2005) World Health Organization Toxic Equivalent Factors.(WHO) Total HxCDF ND 2.78 Total HpCDF ND 4.41 Martha M. Maier 16-Apr-2010 15:19 Approved By: Analyst:WJLMatrix:

Sample Size: Lab Sample: QC Batch No.: Date Extracted: MM5 7-Apr-10 Sample 0-MB001 2924

Analyte Conc. (ng/Sample) a Qualifiers Labeled Standard %R LCL-UCLbQualifiers 

### Method Blank 

### EPA Method 1668

Date Analyzed DB-1: 21-Apr-10

RL
PCB-77 ND 0.0837 * 78.8 25 - 150 IS 13C-PCB-1 PCB-81 ND 0.0764 * 81.0 25 - 150 13C-PCB-3 PCB-105 ND 0.0804 * 74.3 25 - 150 13C-PCB-4 PCB-106/118 ND 0.0820 * 78.9 25 - 150 13C-PCB-9 PCB-114 ND 0.0837 * 79.3 25 - 150 13C-PCB-19 PCB-123 ND 0.0751 * 79.9 25 - 150 13C-PCB-28 PCB-126 ND 0.0889 * 86.3 25 - 150 13C-PCB-32 PCB-156 ND 0.0645 * 90.4 25 - 150 13C-PCB-37 PCB-157 ND 0.0731 * 88.1 25 - 150 13C-PCB-47 PCB-167 ND 0.0665 * 97.0 25 - 150 13C-PCB-81 PCB-169 ND 0.0759 * 89.5 25 - 150 13C-PCB-95 PCB-189 ND 0.0508 * 91.5 25 - 150 13C-PCB-97 91.3 25 - 150 13C-PCB-70 Total monoCB ND 0.100 98.4 25 - 150 13C-PCB-77 Total diCB ND 0.200 92.2 25 - 150 13C-PCB-80 Total triCB ND 0.100 87.6 25 - 150 13C-PCB-52 Total tetraCB ND 0.100 88.5 25 - 150 13C-PCB-54 Total pentaCB ND 0.100 96.1 25 - 150 13C-PCB-101 Total hexaCB ND 0.100 96.8 25 - 150 13C-PCB-104 Total heptaCB ND 0.100 92.6 25 - 150 13C-PCB-105 Total octaCB ND 0.100 95.0 25 - 150 13C-PCB-114 Total nonaCB ND 0.100 98.5 25 - 150 13C-PCB-118 Total decaCB ND 0.100 105 25 - 150 13C-PCB-123 Total PCB ND 0.200 105 25 - 150 13C-PCB-126 100 25 - 150 13C-PCB-127 95.0 25 - 150 13C-PCB-138 97.3 25 - 150 13C-PCB-141 96.8 25 - 150 13C-PCB-153 114 25 - 150 13C-PCB-155 Page 1 of 2Matrix:

Sample Size: Lab Sample: QC Batch No.: Date Extracted: MM5 7-Apr-10 Sample 0-MB001 2924

Analyte Conc. (ng/Sample) a Qualifiers Labeled Standard %R LCL-UCLbQualifiers 

### Method Blank 

### EPA Method 1668

Date Analyzed DB-1: 21-Apr-10

RL
102 25 - 150 13C-PCB-156 104 25 - 150 13C-PCB-157 99.4 25 - 150 13C-PCB-159 104 25 - 150 13C-PCB-167 112 25 - 150 13C-PCB-169 106 25 - 150 13C-PCB-170 109 25 - 150 13C-PCB-180 105 25 - 150 13C-PCB-188 118 25 - 150 13C-PCB-189 93.5 25 - 150 13C-PCB-194 115 25 - 150 13C-PCB-202 99.0 25 - 150 13C-PCB-206 109 25 - 150 13C-PCB-208 89.2 25 - 150 13C-PCB-209 102 30 - 135 AS13C-PCB-79 96.3 30 - 135 13C-PCB-178

0 TEQ (Min): a. Reporting limit. b. Lower control limit - upper control limit.

Martha M. Maier 23-Apr-2010 12:46 Analyst: WJL Approved By: Page 2 of 2

### EPA Method 1668

OPR Results

LCL-UCL Labeled Standard Analyte %R Qualifier Conc. (ng/mL) Matrix: Sample Size: QC Batch No.:
Date Extracted: MM5 7-Apr-10 Sample 2924 0-OPR001 Lab Sample:

Spike Conc. OPR Limits Date Analyzed DB-1: 21-Apr-10

25 - 150 82.3 13C-PCB-1 IS 25 - 75 44.8 50.0 PCB-77 25 - 150 85.2 13C-PCB-3 25 - 75 45.3 50.0 PCB-81 25 - 150 73.7 13C-PCB-4 25 - 75 44.9 50.0 PCB-105 25 - 150 76.9 13C-PCB-9 50 - 150 85.4 100 PCB-106/118 25 - 150 78.7 13C-PCB-19 25 - 75 49.1 50.0 PCB-114 25 - 150 88.0 13C-PCB-28 25 - 75 39.6 50.0 PCB-123 25 - 150 86.3 13C-PCB-32 25 - 75 44.1 50.0 PCB-126 25 - 150 94.6 13C-PCB-37 25 - 75 45.6 50.0 PCB-156 25 - 150 95.1 13C-PCB-47 25 - 75 47.9 50.0 PCB-157 25 - 150 106 13C-PCB-81 25 - 75 46.0 50.0 PCB-167 25 - 150 95.2 13C-PCB-95 25 - 75 47.2 50.0 PCB-169 25 - 150 96.6 13C-PCB-97 25 - 75 43.3 50.0 PCB-189 25 - 150 102 13C-PCB-70 25 - 150 111 13C-PCB-77 25 - 150 103 13C-PCB-80 25 - 150 94.1 13C-PCB-52 25 - 150 92.5 13C-PCB-54 25 - 150 99.4 13C-PCB-101 25 - 150 95.9 13C-PCB-104 25 - 150 99.0 13C-PCB-105 25 - 150 101 13C-PCB-114 25 - 150 103 13C-PCB-118 25 - 150 108 13C-PCB-123 25 - 150 111 13C-PCB-126 25 - 150 104 13C-PCB-127 25 - 150 104 13C-PCB-138 25 - 150 108 13C-PCB-141 25 - 150 107 13C-PCB-153 25 - 150 117 13C-PCB-155 25 - 150 112 13C-PCB-156 25 - 150 110 13C-PCB-157 25 - 150 106 13C-PCB-159 25 - 150 111 13C-PCB-167 25 - 150 126 13C-PCB-169 25 - 150 114 13C-PCB-170 25 - 150 118 13C-PCB-180 25 - 150 112 13C-PCB-188 25 - 150 127 13C-PCB-189 25 - 150 97.0 13C-PCB-194 Page 1 of 2 Approved by: Martha M. Maier 23-Apr-2010 12:46

### EPA Method 1668

OPR Results

Analyte Conc. (ng/mL) Matrix: Sample Size: QC Batch No.:
Date Extracted: MM5 7-Apr-10 Sample 2924 0-OPR001 Lab Sample:

Spike Conc. OPR Limits Date Analyzed DB-1: 21-Apr-10

25 - 150 127 13C-PCB-202 25 - 150 111 13C-PCB-206 25 - 150 122 13C-PCB-208 25 - 150 98.8 13C-PCB-209

Page 2 of 2 Chemist: WJL Approved by: Martha M. Maier 23-Apr-2010 12:46Matrix: Sample Size: Lab Sample: QC Batch No.: Date Extracted: MM5 7-Apr-10 Sample 32542-001 2924

Analyte Conc. (ng/Sample) RLa Qualifiers Labeled Standard %R LCL-UCLbQualifiers 

### EPA Method 1668 1-PCDD-1 Sample ID:

Name: Project: Date Collected: Time Collected: Date Received:

The Avogadro Group, LLC TransAlta Centralia

NA Client Data Sample Data Laboratory Data 30-Mar-10

23-Mar-10 Date Analyzed DB-1: 21-Apr-10

PCB-77 0.487 0.100 85.2 25 - 150 IS 13C-PCB-1 PCB-81 ND 0.0393 * 84.0 25 - 150 13C-PCB-3 PCB-105 15.3 0.100 75.9 25 - 150 13C-PCB-4 PCB-106/118 25.7 0.100 80.8 25 - 150 13C-PCB-9 PCB-114 1.10 0.100 76.6 25 - 150 13C-PCB-19 PCB-123 0.591 0.100 89.7 25 - 150 13C-PCB-28 PCB-126 ND 0.0667 * 91.2 25 - 150 13C-PCB-32 PCB-156 2.65 0.100 108 25 - 150 13C-PCB-37 PCB-157 0.740 0.100 92.3 25 - 150 13C-PCB-47 PCB-167 0.763 0.100 111 25 - 150 13C-PCB-81 PCB-169 ND 0.0488 * 101 25 - 150 13C-PCB-95 PCB-189 ND 0.0302 * 107 25 - 150 13C-PCB-97 107 25 - 150 13C-PCB-70 Total monoCB ND 0.100 115 25 - 150 13C-PCB-77 Total diCB ND 0.715 I 107 25 - 150 13C-PCB-80 Total triCB 1.61 0.100 93.0 25 - 150 13C-PCB-52 Total tetraCB 38.5 0.100 87.8 25 - 150 13C-PCB-54 Total pentaCB 105 0.100 107 25 - 150 13C-PCB-101 Total hexaCB 44.2 0.100 101 25 - 150 13C-PCB-104 Total heptaCB 4.18 0.100 107 25 - 150 13C-PCB-105 Total octaCB 0.257 0.100 108 25 - 150 13C-PCB-114 Total nonaCB ND 0.100 114 25 - 150 13C-PCB-118 Total decaCB ND 0.100 120 25 - 150 13C-PCB-123 Total PCB 189 0.200 121 25 - 150 13C-PCB-126 114 25 - 150 13C-PCB-127 111 25 - 150 13C-PCB-138 110 25 - 150 13C-PCB-141 Page 1 of 2Matrix: Sample Size: Lab Sample: QC Batch No.: Date Extracted: MM5 7-Apr-10 Sample 32542-001 2924

Analyte Conc. (ng/Sample) RLa Qualifiers Labeled Standard %R LCL-UCLbQualifiers 

### EPA Method 1668 1-PCDD-1 Sample ID:

Name: Project: Date Collected: Time Collected: Date Received:

The Avogadro Group, LLC TransAlta Centralia

NA Client Data Sample Data Laboratory Data 30-Mar-10

23-Mar-10 Date Analyzed DB-1: 21-Apr-10

111 25 - 150 13C-PCB-153 123 25 - 150 13C-PCB-155 121 25 - 150 13C-PCB-156 122 25 - 150 13C-PCB-157 117 25 - 150 13C-PCB-159 124 25 - 150 13C-PCB-167 132 25 - 150 13C-PCB-169 122 25 - 150 13C-PCB-170 123 25 - 150 13C-PCB-180 117 25 - 150 13C-PCB-188 140 25 - 150 13C-PCB-189 110 25 - 150 13C-PCB-194 128 25 - 150 13C-PCB-202 112 25 - 150 13C-PCB-206 126 25 - 150 13C-PCB-208 104 25 - 150 13C-PCB-209 103 30 - 135 AS13C-PCB-79 92.9 30 - 135 13C-PCB-178

0.00145 TEQ (Min): a. Reporting limit. b. Lower control limit - upper control limit.

Martha M. Maier 23-Apr-2010 12:46 Analyst: WJL Approved By: Page 2 of 2Matrix: Sample Size: Lab Sample: QC Batch No.: Date Extracted: MM5 7-Apr-10 Sample 32542-002 2924

Analyte Conc. (ng/Sample) RLa Qualifiers Labeled Standard %R LCL-UCLbQualifiers 

### EPA Method 1668 2-PCDD-1 Sample ID:

Name: Project: Date Collected: Time Collected: Date Received:

The Avogadro Group, LLC TransAlta Centralia

NA Client Data Sample Data Laboratory Data 30-Mar-10

24-Mar-10 Date Analyzed DB-1: 21-Apr-10

PCB-77 0.363 0.100 73.9 25 - 150 IS 13C-PCB-1 PCB-81 0.254 0.100 76.4 25 - 150 13C-PCB-3 PCB-105 10.2 0.100 68.3 25 - 150 13C-PCB-4 PCB-106/118 17.7 0.100 72.8 25 - 150 13C-PCB-9 PCB-114 0.749 0.100 71.9 25 - 150 13C-PCB-19 PCB-123 0.362 0.100 87.6 25 - 150 13C-PCB-28 PCB-126 ND 0.0879 * 78.9 25 - 150 13C-PCB-32 PCB-156 1.73 0.100 96.2 25 - 150 13C-PCB-37 PCB-157 0.457 0.100 80.9 25 - 150 13C-PCB-47 PCB-167 0.518 0.100 96.3 25 - 150 13C-PCB-81 PCB-169 ND 0.0887 * 87.6 25 - 150 13C-PCB-95 PCB-189 ND 0.0438 * 90.9 25 - 150 13C-PCB-97 93.3 25 - 150 13C-PCB-70 Total monoCB ND 0.100 102 25 - 150 13C-PCB-77 Total diCB ND 0.570 I 94.6 25 - 150 13C-PCB-80 Total triCB 0.645 0.201 I 81.1 25 - 150 13C-PCB-52 Total tetraCB 29.2 0.100 75.8 25 - 150 13C-PCB-54 Total pentaCB 76.0 0.100 92.4 25 - 150 13C-PCB-101 Total hexaCB 29.9 0.100 90.4 25 - 150 13C-PCB-104 Total heptaCB 2.56 0.100 96.5 25 - 150 13C-PCB-105 Total octaCB ND 0.100 97.2 25 - 150 13C-PCB-114 Total nonaCB ND 0.100 100 25 - 150 13C-PCB-118 Total decaCB ND 0.100 105 25 - 150 13C-PCB-123 Total PCB 137 0.200 111 25 - 150 13C-PCB-126 103 25 - 150 13C-PCB-127 95.0 25 - 150 13C-PCB-138 97.9 25 - 150 13C-PCB-141 Page 1 of 2Matrix: Sample Size: Lab Sample: QC Batch No.: Date Extracted: MM5 7-Apr-10 Sample 32542-002 2924

Analyte Conc. (ng/Sample) RLa Qualifiers Labeled Standard %R LCL-UCLbQualifiers 

### EPA Method 1668 2-PCDD-1 Sample ID:

Name: Project: Date Collected: Time Collected: Date Received:

The Avogadro Group, LLC TransAlta Centralia

NA Client Data Sample Data Laboratory Data 30-Mar-10

24-Mar-10 Date Analyzed DB-1: 21-Apr-10

99.4 25 - 150 13C-PCB-153 109 25 - 150 13C-PCB-155 105 25 - 150 13C-PCB-156 107 25 - 150 13C-PCB-157 104 25 - 150 13C-PCB-159 105 25 - 150 13C-PCB-167 120 25 - 150 13C-PCB-169 110 25 - 150 13C-PCB-170 108 25 - 150 13C-PCB-180 103 25 - 150 13C-PCB-188 118 25 - 150 13C-PCB-189 92.6 25 - 150 13C-PCB-194 115 25 - 150 13C-PCB-202 96.5 25 - 150 13C-PCB-206 106 25 - 150 13C-PCB-208 89.8 25 - 150 13C-PCB-209 102 30 - 135 AS13C-PCB-79 97.2 30 - 135 13C-PCB-178

0.00106 TEQ (Min): a. Reporting limit. b. Lower control limit - upper control limit.

Martha M. Maier 23-Apr-2010 12:46 Analyst: WJL Approved By: Page 2 of 2Matrix: Sample Size: Lab Sample: QC Batch No.: Date Extracted: MM5 7-Apr-10 Sample 32542-003 2924

Analyte Conc. (ng/Sample) RLa Qualifiers Labeled Standard %R LCL-UCLbQualifiers 

### EPA Method 1668 3-PCDD-1 Sample ID:

Name: Project: Date Collected: Time Collected: Date Received:

The Avogadro Group, LLC TransAlta Centralia

NA Client Data Sample Data Laboratory Data 30-Mar-10

25-Mar-10 Date Analyzed DB-1: 21-Apr-10

PCB-77 0.676 0.100 79.2 25 - 150 IS 13C-PCB-1 PCB-81 ND 0.0391 * 79.0 25 - 150 13C-PCB-3 PCB-105 23.4 0.100 72.0 25 - 150 13C-PCB-4 PCB-106/118 40.0 0.100 78.8 25 - 150 13C-PCB-9 PCB-114 1.68 0.100 75.6 25 - 150 13C-PCB-19 PCB-123 0.898 0.100 87.9 25 - 150 13C-PCB-28 PCB-126 0.169 0.100 83.2 25 - 150 13C-PCB-32 PCB-156 3.79 0.100 101 25 - 150 13C-PCB-37 PCB-157 1.09 0.100 88.9 25 - 150 13C-PCB-47 PCB-167 1.16 0.100 105 25 - 150 13C-PCB-81 PCB-169 ND 0.0400 * 90.8 25 - 150 13C-PCB-95 PCB-189 ND 0.0306 * 97.2 25 - 150 13C-PCB-97 101 25 - 150 13C-PCB-70 Total monoCB ND 0.100 107 25 - 150 13C-PCB-77 Total diCB ND 0.626 I 102 25 - 150 13C-PCB-80 Total triCB 1.61 0.100 89.7 25 - 150 13C-PCB-52 Total tetraCB 63.9 0.100 85.4 25 - 150 13C-PCB-54 Total pentaCB 172 0.100 95.8 25 - 150 13C-PCB-101 Total hexaCB 66.6 0.175 I 94.4 25 - 150 13C-PCB-104 Total heptaCB 5.67 0.100 101 25 - 150 13C-PCB-105 Total octaCB 0.302 0.135 I 100 25 - 150 13C-PCB-114 Total nonaCB ND 0.100 104 25 - 150 13C-PCB-118 Total decaCB ND 0.100 108 25 - 150 13C-PCB-123 Total PCB 308 0.200 116 25 - 150 13C-PCB-126 110 25 - 150 13C-PCB-127 101 25 - 150 13C-PCB-138 102 25 - 150 13C-PCB-141 Page 1 of 2Matrix: Sample Size: Lab Sample: QC Batch No.: Date Extracted: MM5 7-Apr-10 Sample 32542-003 2924

Analyte Conc. (ng/Sample) RLa Qualifiers Labeled Standard %R LCL-UCLbQualifiers 

### EPA Method 1668 3-PCDD-1 Sample ID:

Name: Project: Date Collected: Time Collected: Date Received:

The Avogadro Group, LLC TransAlta Centralia

NA Client Data Sample Data Laboratory Data 30-Mar-10

25-Mar-10 Date Analyzed DB-1: 21-Apr-10

103 25 - 150 13C-PCB-153 113 25 - 150 13C-PCB-155 111 25 - 150 13C-PCB-156 111 25 - 150 13C-PCB-157 108 25 - 150 13C-PCB-159 112 25 - 150 13C-PCB-167 126 25 - 150 13C-PCB-169 113 25 - 150 13C-PCB-170 115 25 - 150 13C-PCB-180 108 25 - 150 13C-PCB-188 127 25 - 150 13C-PCB-189 102 25 - 150 13C-PCB-194 120 25 - 150 13C-PCB-202 105 25 - 150 13C-PCB-206 115 25 - 150 13C-PCB-208 97.2 25 - 150 13C-PCB-209 100 30 - 135 AS13C-PCB-79 94.0 30 - 135 13C-PCB-178

0.0191 TEQ (Min): a. Reporting limit. b. Lower control limit - upper control limit.

Martha M. Maier 23-Apr-2010 12:46 Analyst: WJL Approved By: Page 2 of 2Matrix: Sample Size: Lab Sample: QC Batch No.: Date Extracted: MM5 7-Apr-10 Sample 32542-004 2924

Analyte Conc. (ng/Sample) RLa Qualifiers Labeled Standard %R LCL-UCLbQualifiers 

### EPA Method 1668 RB-PCDD-1 Sample ID:

Name: Project: Date Collected: Time Collected: Date Received:

The Avogadro Group, LLC TransAlta Centralia

NA Client Data Sample Data Laboratory Data 30-Mar-10

22-Mar-10 Date Analyzed DB-1: 21-Apr-10

PCB-77 ND 0.0501 * 76.5 25 - 150 IS 13C-PCB-1 PCB-81 ND 0.0451 * 76.2 25 - 150 13C-PCB-3 PCB-105 1.73 0.100 70.2 25 - 150 13C-PCB-4 PCB-106/118 2.83 0.100 73.9 25 - 150 13C-PCB-9 PCB-114 ND 0.0954 * 74.2 25 - 150 13C-PCB-19 PCB-123 ND 0.0978 * 85.3 25 - 150 13C-PCB-28 PCB-126 ND 0.116 * 83.0 25 - 150 13C-PCB-32 PCB-156 0.312 0.100 93.0 25 - 150 13C-PCB-37 PCB-157 ND 0.0767 * 90.0 25 - 150 13C-PCB-47 PCB-167 ND 0.0704 * 105 25 - 150 13C-PCB-81 PCB-169 ND 0.0884 * 92.0 25 - 150 13C-PCB-95 PCB-189 ND 0.0520 * 94.4 25 - 150 13C-PCB-97 98.3 25 - 150 13C-PCB-70 Total monoCB ND 0.100 109 25 - 150 13C-PCB-77 Total diCB ND 0.200 98.0 25 - 150 13C-PCB-80 Total triCB ND 0.100 88.9 25 - 150 13C-PCB-52 Total tetraCB 4.34 0.100 84.4 25 - 150 13C-PCB-54 Total pentaCB 11.2 0.100 94.0 25 - 150 13C-PCB-101 Total hexaCB 3.70 0.100 93.2 25 - 150 13C-PCB-104 Total heptaCB 0.173 0.111 I 101 25 - 150 13C-PCB-105 Total octaCB ND 0.100 100 25 - 150 13C-PCB-114 Total nonaCB ND 0.100 100 25 - 150 13C-PCB-118 Total decaCB ND 0.100 109 25 - 150 13C-PCB-123 Total PCB 20.6 0.200 110 25 - 150 13C-PCB-126 109 25 - 150 13C-PCB-127 102 25 - 150 13C-PCB-138 102 25 - 150 13C-PCB-141 Page 1 of 2Matrix: Sample Size: Lab Sample: QC Batch No.: Date Extracted: MM5 7-Apr-10 Sample 32542-004 2924

Analyte Conc. (ng/Sample) RLa Qualifiers Labeled Standard %R LCL-UCLbQualifiers 

### EPA Method 1668 RB-PCDD-1 Sample ID:

Name: Project: Date Collected: Time Collected: Date Received:

The Avogadro Group, LLC TransAlta Centralia

NA Client Data Sample Data Laboratory Data 30-Mar-10

22-Mar-10 Date Analyzed DB-1: 21-Apr-10

105 25 - 150 13C-PCB-153 112 25 - 150 13C-PCB-155 110 25 - 150 13C-PCB-156 109 25 - 150 13C-PCB-157 104 25 - 150 13C-PCB-159 113 25 - 150 13C-PCB-167 120 25 - 150 13C-PCB-169 109 25 - 150 13C-PCB-170 110 25 - 150 13C-PCB-180 110 25 - 150 13C-PCB-188 117 25 - 150 13C-PCB-189 103 25 - 150 13C-PCB-194 118 25 - 150 13C-PCB-202 109 25 - 150 13C-PCB-206 124 25 - 150 13C-PCB-208 98.8 25 - 150 13C-PCB-209 99.0 30 - 135 AS13C-PCB-79 99.5 30 - 135 13C-PCB-178

0.000146 TEQ (Min): a. Reporting limit. b. Lower control limit - upper control limit.

Martha M. Maier 23-Apr-2010 12:46 Analyst: WJL Approved By: Page 2 of 2

### APPENDIX

## DATA QUALIFIERS & ABBREVIATIONS

B This compound was also detected in the method blank.
D Dilution
E The amount detected is above the High Calibration Limit. P The amount reported is the maximum possible concentration due to possible chlorinated diphenylether interference. H Recovery was outside laboratory acceptance limits.
I Chemical Interference
J The amount detected is below the Low Calibration Limit.
* See Cover Letter
Conc. Concentration DL Sample-specific estimated detection limit
MDL The minimum concentration of a substance that can be measured and reported with 99% confidence that the analyte concentration is greater than zero in the matrix tested.
EMPC Estimated Maximum Possible Concentration NA Not applicable RL Reporting Limit – concentrations that correspond to low calibration point

ND Not Detected TEQ Toxic Equivalency

Unless otherwise noted, solid sample results are reported in dryweight. Tissue samples are reported in wet weight.

### CERTIFICATIONS

Accrediting Authority Certificate Number State of Alaska, DEC CA413-2008 State of Arizona AZ0639 State of Arkansas, DEQ 08-043-0 State of Arkansas, DOH Reciprocity through CA State of California – NELAP Primary AA 02102CA State of Colorado N/A State of Connecticut PH-0182 State of Florida, DEP E87777 State of Indiana Department of Health C-CA-02 Commonwealth of Kentucky 90063 State of Louisiana, Health and Hospitals LA08000 State of Louisiana, DEQ 01977 State of Maine 2008024 State of Michigan 9932 State of Mississippi Reciprocity through CA Naval Facilities Engineering Service Center NFESC413 State of Nevada CA004132007A State of New Jersey CA003 State of New Mexico Reciprocity through CA State of New York, DOH 11411 State of North Carolina 06700 State of North Dakota, DOH R-078 State of Oklahoma D9919 State of Oregon CA200001-006 State of Pennsylvania 68-00490 State of South Carolina 87002001 State of Tennessee TN02996 State of Texas T104704189-08-TX U.S. Army Corps of Engineers N/A State of Utah CA16400 Commonwealth of Virginia 00013 State of Washington C1285 State of Wisconsin 998036160 State of Wyoming 8TMS-Q