NYC-WTC_000224771

NYC 9/11 Public Portal Document

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

Analytical Method 8290 Laboratory Control Spike Results Tel: 612-607-1700 Fax: 612- 607-6444

Client - ATC

Lab Sample 10 SPIKE-DUP-1405 Filename U20506B_01 Matrix WIPE Total Amount Extracted 1 m2 Dilution NA ICAL Date 04/16/2002 Extracted 04/30/2002 CCal Filename(s) U20506A_15 & U20506B_15 Analyzed 05/06/2002 21:42 Method Blank ID BLANK-1606 Injected By CVS

Native Qs Qm % Internal ng's Percent Isomers (ng) (ng) Rec. Standards Added Recovery 2,3,7,8-TCDF 0.20 0.21 104 2,3,7,8-TCDF-13C 2.00 79 2,3,7,8-TCDD-13C 2.00 83 1,2,3,7,8-PeCDF-13C 2.00 80 2.3.7,8-TCDD 0.20 0.20 98 2,3,4,7,8-PeCDF-13C 2.00 78 1,2,3,7,8-PeCDD-13C 2.00 82 1,2,3,4,7,8-HxCDF-13C 2.00 98 1,2,3,7,8-PeCDF 1.00 1.05 105 1,2,3,6.7,8-HxCDF-13C 2.00 104 2.3,4,7,8-PeCDF 1.00 1.04 104 2,3,4,6,7.8-HxCDF-13C 2.00 98 1,2,3,7,8,9-HxCDF-13C 2.00 98 1,2,3,4,7,8-HxCDD-13C 2.00 95 1,2,3,7,8-PeCDD 1.00 0.96 96 1,2,3,6,7,8-HxCDD-13C 2.00 92 1,2,3,4,6.7,8-HpCDF-13C 2.00 99 1,2,3,4,7,8,9-HpCDF-13C 2.00 99 1,2,3,4,7,8-HxCDF 1.00 1.01 101 1,2,3,4,6,7,8-HpCDD-13C 2.00 99 1,2,3,6,7,8-HxCDF 1.00 1.07 107 OCDD-13C 4.00 101 2,3,4,6,7,8-HxCDF 1.00 1.01 101 1,2,3,7,8,9-HxCDF 1.00 0.97 97 1,2,3,4-TCDD-13C 2.00 NA 1,2,3,7,8.9-HxGDD-13C 2.00 NA

1,2,3,4,7,8-HxCDD 1.00 1.00 100 2,3,7,8-TCDD-37CI4 0.20 94 1,2,3,6,7,8-HxCDD 1.00 1.02 102 1,2,3,7,8,9-HxCDD 1.00 1.06 106

1,2,3,4,6,7,8-HpCDF 1.00 0.96 96 1,2,3,4,7,8,9-HpCDF 1.00 0.94 94

1,2,3,4,6,7,8-HpCDD 1.00 0.96 96

OCDF 2.00 1.94 97 OCDD 2.00 1.89 95

Qs = Quantify Spiked Qm = Quantify Measured Rec. = Recovery (Expressed as Percent) P = Recovery outside o1 target range X = Background subtracted value Nn = Value obtained from additional analysis NA = Not Applicable ° = See Discussion Report No.... 02-1056602

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

CITY_21MC100_0b2894502

NYC-WTC_000224771