NYC-WTC_000207701

NYC 9/11 Public Portal Document

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

^aceAnalytical _____________ Method 8290 Laboratory Control Spike Results Tel: 612-607*1700 Frx- B12- 607-6444

Client - ATC ASSOCIATES

Lab Sample ID SPIKE DUP-2233 Filename U21008B_02 Matrix WIPE Total Amount Extracted 1.00 m2 Dilution NA ICAL Date 08/06/2002 Extracted 09/29/2002 CCal Filename{s) U21008A_17 & U21008B_16 Analyzed 10/08/2002 22:23 Method Blank ID BLANK-2231 Injected By MRO

Native Qs Qm % Internal ng's Percent Isomers (ng) (ng) Standards Added Recovery Rec, 2,3,7,8-TCDF 0.20 0.19 96 2,3,7,8-TCDF-13C 2.00 69 _ 2,3,7,8-TCDD-13C 2.00 66 1,2,3,7,8-PeCDF-13C 2.00 80 2.3,7,8-TCDD 0.20 0.19 93 2,3,4,7,8-PeCDF-13C 2.00 80 1,2,3,7,8-PeCDD-13C 2.00 80 1,2,3,4,7,8-HxCDF-13C 2.00 85 1,2,3,7,8-PeCDF 1.00 0.95 95 1,2,3,6,7,8-HxCDF-13C 2.00 90 2,3,4,7,8-PeCDF 1.00 0.98 98 2,3,4,6,7,8-HxCDF-13C 2.00 87 1,2,3,7,8,9-HxCDF-13C 2.00 87 1,2,3,4,7,8-HxCDD-13C 2.00 92 1,2,3,7,8-PeCDD 1.00 0.94 94 1,2,3,6,7,8-HxCDD-13C 2.00 86 1,2.3.4,6,7,8-HpCDF-13C 2.00 83 1,2,3,4,7,8,9-HpCDF-13C 2.00 80 1,2,3,4,7,8-HxCDF 1.00 0.95 95 1,2,3,4,6,7,8-HpCDD-13C 2.00 75 1,2,3.6,7,8-HxCDF 1.00 0.97 97 OCDD-13C 4.00 69 2,3,4,6,7,8-HxCDF 1.00 0.98 98 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 0.90 90 2,3,7,8-TCDD-37CI4 0.20 69 1,2,3,6,7.8’HxCDD 1.00 0.98 98 1,2,3,7,8,9-HxCDD 1.00 0.96 96

1,2,3,4,6,7,8-HpCDF 1.00 0.98 98 ...J 98 1,2,3,4,7,8,9-HpCDF 1.00 0.98

1,2,3,4,6,7,8-HpCDD 1.00 1.02 102

OCDF 2.00 2.04 102 OCDD 2.00 2.00 100 d Qs = Quantity Spiked Qm = Quantity Measured Rec. = Recovery (Expressed as Percent) J P = Recovery outside of target range X = Background subtracted value Nn = Value obtained from additional analysis NA = Not Applicable * = See Discussion Report No.... 1061946

..-J

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

CITY_21MC100_003015721

NYC-WTC_000207706