NYC-WTC_000228701

NYC 9/11 Public Portal Document

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

/J^ce Analytical___________ Tel: 612-607-1700 Pay 619- 607-6444 / Method 8290 Laboratory Control Spike Results Client - ATC ASSOCIATES

Lab Sample ID SPIKE-1680 Filename F20617A_13 Matrix WIPE Total Amount Extracted 1 m2 Dilution NA ICAL Date 05/04/2002 Extracted 06/12/2002 CCal Filename(s) F20616A_15 & F20617A_15 Analyzed 06/17/2002 17:00 Method Blank ID BLANK-1666 Injected By MRO

Native Qs Qm % Internal ng's Percent Isomers (ng) (ng) Rec, Standards Added Recovery 2,3,7,8-TCDF 0.20 0.23 114 2,3,7,8-TCDF-13C 2.00 76 2,3,7,8-TCDD-13C 2.00 65 1,2,3,7,8-PeCDF-13C 2.00 66 2,3,7,8-TCDD 0.20 0.21 107 2,3,4,7,8-PeCDF-13C 2.00 66 1.2,3,7,8-PeCDD-13C 2.00 59 1,2,3,4,7,8-HxCDF-13C 2.00 86 1.2,3,7,8-PeCDF 1.00 1.10 110 1.2.3.6,7,8-HxCDF-13C 2.00 104 2.3,4,7,8-PeCDF 1.00 1.09 109 2,3,4,6,7,8-HxGDF-13C 2.00 88 1.2,3,7,8,9-HxCDF-13C 2.00 86 1.2,3.4,7,8-HxCDD-13C 2.00 77 1.2,3,7.8-PeCDD 1.00 1.10 110 1,2,3,6.7,8-HxCDD-13C 2.00 84 1,2,3,4,6,7,8-HpCDF-13C 2.00 71 1,2,3,4,7,8,9-HpCDF-13C 2.00 58 1.2,3,4,7.8-HxCDF 1.00 1.13 113 1,2,3,4,6,7,8-HpCDD-13C 2.00 61 1,2,3,6,7,8-HxCDF 1.00 1.02 102 OCDD-13C 4.00 56 2,3,4,6,7,8-HxCDF 1.00 1.07 107 1,2,3,7,8,9-HxCDF 1.00 1.05 105 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 1.14 114 2.3,7.8-TCDD-37CI4 0.20 77 1,2,3,6,7,8-HxCDD 1.00 1.16 116 1,2,3,7,8,9-HxCDD 1.00 1.17 117

1,2,3,4,6,7,8-HpCDF 1.00 1.03 103 1.2,3,4,7,8.9-HpCDF 1.00 1.02 102

1,2,3,4,6,7,8-HpCDD 1.00 1.12 112

OCDF 2.00 2.34 117 OCDD 2.00 2.22 111

Qs = Quantity Spiked Qm = Quantity Measured Rec. = Recovery (Expressed as Percent) P = Recovery outside of tarpet range X 3 Background subtracted value Nn = Value obtained from additional analysis NA = Not Applicable • = See Discussion Report No.... 02-1058093

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

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NYC-WTC_000228705