NYC-WTC_000223630

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 Far 612-607-6444

Client - ATC

Lab Sample ID SPIKE-1623 Filename U20506A_01 Matrix WIPE Total Amount Extracted 1 m2 Dilution NA ICAL Date 04/16/2002 Extracted 04/30/2002 CCal Filename(s) U20505B_16 & U20506A_15 Analyzed 05/06/2002 09:23 Method Blank ID BLANK-1606 Injected By CVS

Native Qs Qm % Internal ng's Percent Isomers (ng) (ng) Standards Added Recovery Rec. 2,3,7.8-TCDF 0.20 0.21 104 2,3,7,8-TCDF-13C 2.00 64 2,3,7,8-TCDD-13C 2.00 68 1,2,3,7,8-PeCDF-13C 2.00 57 2.3,7,8-TCDD 0.20 0.19 96 2,3,4,7,8-P0CDF-13C 2.00 56 1,2,3,7,8PeCDD-13C 2.00 61 1.2,3,4,7,8-HXCDF-13C 2.00 80 1,2,3,7,8-PeCDF 1.00 1.06 106 1.2,3,6,7,8-HxCDF-13C 2.00 75 2,3,4,7,8-PeCDF 1.00 1.05 105 2,3,4,6,7,8-HxCDF-13C 2.00 74 1,2,3,7,8,9-HxCDF-13C 2.00 77 1,2,3,4,7,8-HxCDD-13C 2.00 80 1,2,3,7.8-P0CDD 1.00 0.96 96 1,2,3,6,7,8-HxCDD-13C 2.00 75 1,2,3,4,6,7,8-HpCDF-13C 2.00 74 1,2,3,4,7,8,9-HpCDF-13C 2.00 77 1,2,3,4,7,8-HxCDF 1.00 1.01 101 1,2,3,4,6,7,8-HpCDD-13C 2.00 75 1,2.3,6,7,8-HxCDF 1.00 1.03 103 OCDD-13C 4.00 70 2,3,4,6,7,8-HxCDF 1.00 1.01 101 1,2,3,7,8,9-HxCDF 1.00 0.98 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 0.96 96 2,3.7,8-TCDD-37CI4 0.20 76 1,2,3,6,7,8-HxCDD 1.00 1.00 100 1,2,3,7,8,9-HxCDD 1.00 0.99 99

1,2,3,4,6,7,8-HpCDF 1.00 0.97 97 1.2,3,4,7,8,9-HpCDF 1.00 0.96 96

1,2,3,4,6,7,8-HpCDD 1.00 0.99 99

OCDF 2.00 2.00 100 OCDD 2.00 2.02 101

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.... 02-1056602

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

CITY_21MC100_002919505

NYC-WTC_000223630