NYC-WTC_000203440

NYC 9/11 Public Portal Document

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

'ace Analytical8290____________ Laboratory Method Control Spike Results Tel: 612-607-1700 Fax: 612- 607-6444

Client - ATC

Lab Sample ID SPIKE-DUP-1367 Filename U20410B_20 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 10:24 "I BAL Method Blank ID BLANK-1556 Injected By i Native Qs Qm % Internal ng’s Percent Isomers (ng) Standards Added Recovery Bec.- 2,3,7,3-TCDF 0.20 0.25 125 2,3,7,8-TCDF-13C 2.00 65 2,3,7,8-TCDD-13C 2.00 66 1,2,3,7,8-PeCDF-13C 2.00 61 2,3,7,8-TCDD 0.20 0.25 123 2,3,4,7,8-PeCDF-13C 2.00 62 1,2,3,7,8-PeCDD-13C 2.00 63 1,2,3,4,7,8-HxCDF-13C 2.00 96 1,2,3,7.8-PeCDF 1.00 1.30 130 1,2,3,6,7,8-HxCDF-13C 2.00 94 2,3,4,7,a-PeCDF 1.00 1.30 130 2,3,4,6.7.8-HxCDF-13C 2.00 89 1,2,3,7,8,9-HxCDF-13C 2.00 88 1,2,3,4,7,8-HxCDD-13C 2.00 89 1,2,3,7,8-PeCDD 1.00 1.29 129 1,2,3,6,7,8-HxCDD-13C 2.00 89 1,2,3,4,6,7,8-HpCDF-13C 2.00 81 1,2,3,4,7,8,9-HpCDF-13C 2.00 74 1,2,3,4,7,8-HxCDF 1.00 1.30 130 1,2,3,4,6,7,8-HpCDD-13C 2.00 88 1,2,3,6,7,8-HxCDF 1.00 1.31 131 P OCDD-13C 4.00 76 2,3,4,6,7,8-HxCDF 1.00 1.32 132 P J 1,2,3,7,8,9-HxCDF 1.00 1.27 127 1,2,3,4-TCDD-13C 1,2,3,7,8,9-HxCDD-13C 2.00 2.00 NA NA

1,2,3,4,7,8-HxCDD 1.00 1.28 128 2,3,7,8-TCDD-37CI4 0.20 73 J 1,2,3,6,7,8-HxCDD 1,2,3,7,8.9-HxCDD 1.00 1.00 1.28 1.21 128 121

1,2,3,4,6,7,8-HpCDF 1.00 1.25 125 1.2,3.4.7,8,9-HpCDF 1.00 1.23 123

1,2,3,4,6,7,8-HpCDD 1.00 1.18 118

OCDF 2.00 2.55 127 OCDD 2.00 2.59 130

Qs = Quantity Spiked 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.... 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_21MC100_003068197

NYC-WTC_000203441