Laboratory analysis report appendix, World Trade Center

NYC 9/11 Public Portal Document

Pace Analytical Services, Ino. 1700 Elm Street - Suite 200 Minneapolis, MN 55414

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Lab Sample ID BLANK-1556 Matrix WIPE Filename U20411A_03 Dilution NA ■■J Total Amount Extracted 1 m2 Extracted 04/05/2002 ICAL Date 04/10/2002 Analyzed 04/11/2002 15:06 CCal Filename(s) U20411A_01 &U20411B_01 Injected By CVS

Native Cone EMPC LRL Internal ng's Percent Isomers ng/m2 ng/m2 ng/m2 Standards Added Recovery 2,3.7,8-TCDF ND ---- 0.00200 2.3,7,8-TCDF-13C 2.00 73 Total TCDF ND ---- 0.00200 2,3,7,8-TCDD-13C 2.00 54 1,2,3.7,8-PeCDF-13C 2.00 84 2,3,7,8-TCDD ND 0.00200 . 2,3,4,7,8-PeCDF-13C 2.00 86 Total TCDD 0.0063 0.00200 J 1,2,3.7,8-PeCDD-13C 2.00 63 1,2,3.4,7,8-HxCDF-13C 2.00 99 1.2,3,7,8-PeCDF ND 0.01000 1,2.3.6,7,8-HxCDF-13C 2.00 98 2,3,4.7.8-PeCDF ND 0.01000 2,3,4,6.7,8-HxCDF-13C 2.00 96 Total PeCDF ND 0.01000 1.2.3,7,8.9-HxCDF-13C 2.00 92 1,2,3,4,7.8-HxCDD-13C 2.00 76 1,2,3.7,8-PeCDD ND 0.01000 1,2,3.6.7.8-HxCDD-13C 2.00 75 Total PeCDD ND 0.01000 1,2,3,4,6,7,8-HpCDF-13C 2.00 60 1,2,3.4.7,8,9-HpCDF-13C 2.00 56 1,2,3,4,7,8-HxCDF ND 0.01000 1,2,3.4,6,7.8-HpCDD-13C 2.00 45 1,2,3,6,7.8-HxCDF ND 0.01000 OCDD-13C 4.00 62 2,3.4,6,7,8-HxCDF ND 0.01000 1,2,3.7,8,9-HxCDF ND 0.01000 1,2,3,4-TCDD-13C 2.00 NA Total HxCDF ND 0.01000 1,2,3.7,8,9-HxCDD-13C 2.00 NA

] 1,2,3,4,7,8-HxCDD 1,2,3,6,7,8-HxCDD ND ND 0.01000 0.01000 2,3,7,8-TCDD-37CI4 0.20 67 1,2,3,7,8,9-HxCDD ND 0.01000 Total HxCDD ND 0.01000 1.2,3,4,6,7,8-HpCDF ND 0.01000 Total 2,3,7.8-TCDD 1.2,3,4.7,8,9-HpCDF ND 0.01000 Equivalence; 0.000028 ng/m2 Total HpCDF ND 0.01000 (Using ITE Factors) 1,2,3,4,6,7,8-HpCDD ND 0.01000 Total HpCDD ND 0.01000 OCDF ND 0.02000 OCDD 0.0280 0.02000 J

Cone = Concentration (Totals include 2,3,7,8-substituted isomers). I = Interference EMPC = Estimated Maximum Possible Concentration E = PCDE Interference LRL = Lower Reporting Limit ND = Not Detected J = Concentration delected is below the calibration range NA = Not Applicable

t I P = Recovery outside of target range A = Detection Limit based on signal-to-noise measurement NC = Not Calculated * = See Discussion j

Report No.... 02-1055553

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

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