Analytical laboratory reports attachment for PCDDs and PCDFs, 2008

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Pace Analytical Services, Inc. 1700 Elm Street, Suite 200 ^ace Analytical" Minneapolis, MN 55414 Phone: S12.607.170D REPORT OF: CHEMICAL ANALYSES Fax: 612.807.6444

I PROJECT: PCDDZPCOF ANALYSES DATE: January 9, 2002

PAGE: 4 REPORT NO: 01-1052682

I aty PCDDZPCDF Quantification and Calculations /.cl

The PCDD/PCDF isomers were quantified by comparison of their responses to the responses of the labeled internal standards. Relative response factors were calculated from analyses of standard y mixture^^Sbntaining representatives of each of the PCDDZPCDF congener classes at five cont^^fetion levels, and each of the internal standards at one concentration level, as shown in 4. The PCDDZPCDF response factors were calculated by comparing the sum of the responses from the two ion masses monitored for each chlorine congener class to the sum of the - responses from the two ion masses of the corresponding isotopically labeled internal standard. The , formula for the response factor calculation is:

An X Qis Rf = Ais X Qn

where: •

Rf = Response factor An = Sum of integrated areas for native isomer Qis = Quantity of labeled internal standard ■ Ais = Sum of integrated areas for labeled internal standard ,, Qn = Quantity of native isomer

The levels of PCDDZPCDF in each sample were quantified using the following equation:

An X Qis d C = Ais X W X Rf 3 C = Concentration of target isomer or congener class J An = Sum of integrated areas for the target isomer or congener class Qis = Quantity of labeled internal standard added to the sample , Ais = Sum of integrated areas for the labeled internal standard ! W = Sample amount Rf = Response factor

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REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, without the written consent of Pace Analytical Services, Inc. »DCe.

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CONFIDENTIAL, CITY_21MC100_003432697 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

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