NYC-WTC_000203440

NYC 9/11 Public Portal Document

Pace Anal^Ticai' Se-vices, Inc. 1700 Elm Street ■ Suite 200 Minneapolis, MN 55414

'ace Analytical____________ Laboratory Results Method 8290 Control Spike Tel: 612-607-1700 Fax: 612- 607-6444

Client - ATC

Lab Sample ID SPIKE-1568 Filename U20410B_19 Matrix WIPE Total Amount Extracted 1 m2 Dilution NA ICAL Date 04/10/2002 Extracted 04/05/2002 CCal Filename(s) U20410B_06 & U20410B_21 Analyzed 04/11/2002 09:35 Method Blank ID BLANK-1556 Injected By BAL

Native Qs Qm % Internal ng's Percent Isomers (ng) (ng) Rec. Standards Added Recovery 2,3.7,8-TCDF 0.20 0.29 145 P 2.3,7,8-TCDF-13C 2.00 63 2,3,7,8-TCDD-13C 2.00 66 1,2,3,7,8-PeCDF-13C 2.00 62 2,3,7,8-TCDD 0.20 0.28 141 P 2,3,4,7,8-PeCDF-13C 2.00 63 1,2,3,7,8-PeCDD-13C 2.00 64 1,2,3,4,7,8-HxCDF-13C 2.00 101 1,2,3,7,8-PeCDF 1.00 1.48 148 P 1,2,3,6,7,8-HxCDF-13C 2.00 97 2,3,4,7,8-PeCDF 1.00 1.50 150 P 2,3,4,6,7,8-HxCDF-13C 2.00 94 I 1.2,3,7,8.9-HxCDF-13C 1,2,3,4,7,8-HxCDD-13C 2.00 2.00 88 97 1,2,3,7,8-PeCDD 1.00 1.48 148 P 1.2.3,6,7,8-HxCDD-13C 2.00 89 1,2,3,4,6.7,8-HpCDF-13C 2.00 86 1,2,3,4,7,8.9-HpCDF-13C 2.00 76 1,2,3,4,7,8-HxCDF 1.00 1.51 151 P 1,2,3,4,6,7,8-HpCDD-13C 2.00 91 1,2,3,3,7,8-HxCDF 1.00 1.51 151 P OCDD-13C 4.00 80 2,3,4,S,7,8-HxCDF 1.00 1.48 148 P 1,2,3,7,8,9-HxCDF 1.00 1.49 149 P 1,2,3,4-TCDD-13C 2.00 NA 1,2,3,7,8.9-HxCDD-13C 2.00 NA I 1,2,3,4,7,8-HxCDD 1.00 1.48 148 P 2,3,7,8-TCDD-37CI4 0.20 75 1,2,3,6,7,8-HxCDD 1.00 1.49 149 P 1,2,3,7,8,9-HxCDD 1.00 1.38 138 P 1 i 1,2,3,4,6,7,8-HpCDr 1.00 1.44 144 P 1,2,3.4,7.8.9-HpCDF 1.00 1.45 145 P

1,2,3,4,6,7.8-HpCDD 1.00 1.39 139 P

OCDF 2.00 2.88 144 P OCDD 2.00 2.98 149 P

Qs = Quantity Spiked Qm = (Quantity Measured Rec. = Recovery (Expressed as Percent) P := Recovery outside ol target range X =; Background subtracted value Nn = Value obtained from additional analysis NA = Not Applicable ’ := See Discussion 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.

CITY_21MC1OO_OO3O68196

NYC-WTC_000203440