NYC-WTC_000227084

NYC 9/11 Public Portal Document Pace Analytical Services, Inc. 1700 Elm Street - Suite 200 Minneapolis, MN 55414

^ceAnalvticar Method 8290 Laboratory GontroB Spite Results Tel: 612-607-1700 fax: 612-607-^

Client - ATC

Lab Sample ID SPIKE-1594 Filename U20425A_04 Matrix WIPE Total Amount Extracted 1 m2 Dilution NA ICAL Date 04/16/2002 Extracted 04/18/2002 CCal Filename(s) U20425A_01 & U20425A_16 Analyzed 04/24/2002 23:55 Method Blank ID BLANK-1579 Injected By BAL

Wa^lv® Qs Qm % Internal Percent Bsomairs (ng) (ng) Rec. Standards Added Recovery 2,3,7.8-TCDF 0.20 0.20 102 2,3,7,8-TCDF-13C 2.00 71 2,3,7,8-TCDD-13C 2.00 77 1,2,3,7,8-PeCDF-13C 2.00 72 2,3,7,8-TCDD 0.20 0.20 98 2.3,4,7,8-PeCDF-13C 2.00 70 1,2,3,7,8-PeCDD-13C 2.00 76 1,2,3,4,7,8-HxCDF-13C 2.00 94 3 1,2,3,7,8-PeCDF 1.00 0.96 96 1,2,3,6,7,8-HxCDF-13C 2.00 89 2,3.4,7,8-PeCDF 1.00 0.96 96 2,3,4,6,7,8-HxCDF-13C 2.00 90 1,2,3,7,8,9-HxCDF-13C 2.00 97 1,2,3,4,7,8-HxCDD-13C 2.00 97 1,2,3,7.8-PeCDD 1.00 1.01 101 1,2,3,6,7,8-HxCDD-13C 2.00 90 1,2,3,4,6,7,8-HpCDF-13C 2.00 95 1,2,3,4,7,8,9-HpCDF-13C 2.00 107 1,2,3,4,7,8-HxCDF 1.00 0.95 95 - 1,2,3,4,6,7,8-HpCDD-13C 2.00 104 1.2,3,6,7,8-HxCDF 1.00 0.97 97 OCDD-13C 4.00 109 2,3.4,6.7.8-HxCDF 1.00 0.95 95 1,2,3,7,8,9-HxCDF 1.00 0.92 92 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 1.02 102 2,3,7,8-TCDD-37CI4 0.20 91 1,2,3,6,7,8-HxCDD 1.00 0.93 93 1,2,3,7,8,9-HxCDD 1.00 1.00 100

1,2,3,4,6,7.8-HpCDF 1.00 0.97 97 1,2,3,4,7,8,9-HpCDF 1.00 0.97 97

1,2,3,4,6.7,8-HpCDD 1.00 0.97 97

OCDF 2.00 2.08 104 OCDD 2.00 1.97 98

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.... 02-1055822

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

CITY_21MC100_002898164

NYC-WTC_000227088