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Analytical results for wipe samples, Aug-Oct 2002

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Laboratory analytical report for wipe samples analyzed between August and October 2002 by a third-party testing firm.

NYC-WTC_000175254
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NYC 9/11 Public Portal Document

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

Analytical'___________ Method 8290 Laboratory Control*Spike Results Tel: 612-607-1700 Fax; 612- 607-6444

Client - ATC ASSOCIATES

Lab Sample ID SPIKE DUP-2233 Filename U21008B_02 Matrix WIPE Total Amount Extracted 1.00 m2 ■ Dilution NA ICAL Date 08/06/2002 Extracted . 09/29/2002 CCal Filename(s) U21008A_17 & U21008B_16 Analyzed 10/08/2002 22:23 ni, - Method Blank ID BLANK-2231 Injected By MRO

Native Qs Qm % Internal ng's Percent Isomers (ng) (ng) Standards Added Recovery Rec. 2,3.7.8-TCDF 0.20 0.19 96 2,3,7,8-TCDF-13C 2.00 69 2,3,7,8-TCDD-13C 2.00 66 1,2,3,7,8-PeCDF-13C 2.00 80 2,3,7.8-TCDD 0.20 0.19 ■ 93 2,3,4,7,8-PeCDF-13C 2.00 80 1,2,3,7,8-PeCDD-13C 2.00 80 ; J 1,2,3,4,7,8-HxCDF-13C 2.00 85 1,2.3.7.8-PeCDF 1.00 0.95 95 1,2,3,6,7,8-HxCDF-13C 2.00 90 2,3,4,7,8-PeCDF 1.00 0.98 98 2,3,4,6,7,8-HxCDF-13C 2.00 87 ! 1,2,3,7,8,9-HxCDF-13C 87 ,1 1,2,3,4,7,8-HxCDD-13C 2.00 92 1,2,3.7.8-PeCDD 1.00 0.94 94 1,2,3,6,7,8-HxCDD-13C . 2.00 86 t. 1,2,3,4,6,7,8-HpCDF-13C 2.00 83 1,2,3,4,7,8,9-HpCDF-13C 2.00 80 1,2,3,4,7,8-HxCDF 1.00 95 1,2,3,4,6,7,8-HpCDD-13C 2.00 75 1,2,3.6,7,8-HxCDF 1.00 97 OCDD-13C 4.00 69 2,3,4.6,7.8-HxCDF 1.00 98 1,2,3,7,8,9-HxCDF 1.00 98 1.2,3;4-TCDD-13C 2.00 NA 1,2,3.7,8,9-HxCDD-13C 2.00 NA

1,2.3,4,7,8-HxCDD 1.00 0.90 90 2,3,7,8-TCDD-37CI4 0;20 69 1,2,3,6,7,8-HxCDD 1.00 0.98 98 1,2,3,7.8,9-HxCDD 1.00 0.96 96

1,2,3,4,6,7,8-HpCDF .1.00 0.98 98 i 1,2,3,4.7,8,9-HpCDF 1.00 0.98 98

1,2,3,4,6,7.8-HpCDD 1.00 1.02 102

OCDF 2.00 2.04 102 OCDD 2.00 2.00 100

Qs = Quantity Spiked

a Qm = Quantity Measured Rec. = Recovery (Expressed as Percent) P = Recovery outside of target range X = Background subtracted value Nn = Value obtained from additional analysis NA = Not Applicable * = See Discussion Report No.... 1062004

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

CONFIDENTIAL, CITY_21MC100_003430853

SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175254

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NYC-WTC_000175254Source: NYC Law Department, mirrored locally

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