NYC-WTC_000228425

NYC 9/11 Public Portal Document 1700 Elm Street - Suite 200 Minneapolis, MN 55414

/ Analytical'___________ Method 8290 Laboratory Control Spike Results Tel; 612-607-1700 Fax- 612- 607-6444

Client - ATC

Lab Sample ID SPIKE-1537 Filename F20326A_02 Matrix WIPE Total Amount Extracted 1 Sample Dilution NA ICAL Date 01/24/2002 Extracted 03/21/2002 CCal Filename(s) F20326A_01 & F20326A J6 Analyzed 03/26/2002 14:51 Method Blank ID BLANK-1528 Injected By BAL

Native Qs Qm % internai ng's Percent isomers (ng) (ng) Standards Added Recovery Rec, 2.3,7,8-TCDF 0.20 0.22 110 2,3,7,8-TCDF-13C 2.00 80 2.3,7,8-TCDD-13C 2.00 72 1,2,3,7,8-PeCDF-13C 2.00 86 2,3,7,8-TCDD 0.20 0.22 111 2,3.4,7,8-PeCDF-13C 2.00 79 1,2,3,7,8-PeCDD-13C 2.00 74 1,2,3,4,7,8-HXCDF-13C 2.00 117 1,2,3,7,8-PeCDF 1.00 1.00 100 1,2,3,6,7,8-HxCDF-13C 2.00 109 2.3.4,7,8-PeCDF 1.00 1.02 102 2,3,4,6,7,8-HxCDF-13C 2.00 109 1,2,3.7,8,9-HxCDF-13C 2.00 93 1,2,3,4,7,8-HxCDD-13C 2.00 99 1^,3,7,8-PeCDD 1.00 1.05 105 1,2,3,6,7,8-HxCDD-13C 2.00 102 1,2.3.4,6,7,8-HpCDF-13C 2.00 85 1,2,3,4,7,8,9-HpCDF-13C 2.00 71 1.2,3,4,7,8-HxCDF 1.00 1.03 103 1,2,3,4,6,7,8-HpCDD-13C 2.00 94 1,2.3,6,7.8-HxCDF 1.00 1.05 105 OCDD-13C 4.00 78 2,3,4,6,7,8-HxCDF 1.00 1.04 104 1,2,3,7,8,9-HxCDF 1.00 1.01 101 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 1.04 104 2,3,7,8-TCDD-37Cl4 0.20 78 1,2,3,6,7,8-HxCDD 1.00 1.03 103 1,2,3,7,8,9-HxCDD 1.00 1.02 102

1,2.3,4,6.7,8-HpCDF 1.00 1.21 121 1,2,3,4,7,8,9-HpCDF 1.00 1.05 105

1.2.3.4.6,7,8-HpCDD 1.00 1.01 101

OCDF 2.00 1.37 68 P OCDD 2.00 2.08 104

Qs X Quantity Spiked Qm X Quantity Measured Rec. X Recovery (Expressed as Percent) P X Recovery outside of target range X X Background subtracted value Nn X Value obtained from additionai analysis NA X Not Applicable * X See Discussion Report No.... 02-1055017

REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, vrithout the written consent of Pace Analytical Services, Inc.

CITY_21MC100_002900525

NYC-WTC_000228446