NYC-WTC_000223243

NYC 9/11 Public Portal Document

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

^ace Analytical' Tel: 612-607-1700 Fax' 612- 607-6444

Method 8290 Blank Analysis Results Client - ATC

Lab Sample ID BLANK-1592 Matrix WIPE Filename F20429A_04 Dilution NA Total Amount Extracted 1 m2 Extracted 04/24/2002 I ICAL Date 04/12/2002 Analyzed 04/29/2002 12:41 CCal Filename(s) F20429A_01 & F20429A_15 Injected By BAL

1 Native Cone EMPC LRL internal ng's Percent isomers ng/m2 ng/m2 ng/m2 Standards Added Recovery 2,3,7,8-TCDF ND — 0.00200 2.3,7,8-TCDF-13C 2.00 75 Total TCDF NO — 0.00200 2,3,7,8-TCDD-13C 2.00 78 1,2,3,7,8-PeCDF-13C 2.00 87 2,3,7,8-TCDD ND 0.00200 2,3,4,7,8-PeCDF-13C 2.00 81 Total TCDD 0.051 0.00200 1,2,3,7,8-PeCDD-13C 2.00 87 1,2,3,4,7,8-HxCDF-13C 2.00 97 1,2,3,7,8-PeCDF ND 0.01000 1,2,3,6,7,8-HxCDF-13C 2.00 81 2,3,4,7,8-PeCDF ND 0.01000 2,3,4,6.7,8-HxCDF-13C 2.00 83 Total PeCDF ND 0.01000 1,2,3,7,8,9-HxCDF-13C 2.00 84 1,2,3,4,7,8-HxCDD-13C 2.00 97 1,2,3.7,8-PeCDD ND 0.01000 1,2,3,6,7,8-HxCDD-13C 2.00 89 Total PeCDD ND 0.01000 1,2,3,4,6,7,8-HpCDF-13C 2.00 87 1,2,3,4,7,8,9-HpCDF-13C 2.00 81 1,2,3.4,7,8-HxCDF ND 0.01000 1,2,3,4,6,7.8-HpCDD-13C - 2.00 98 1,2,3,6,7,8-HxCDF ND 0.01000 OCDD-13C 4.00 68 2,3,4,6,7,8-HxCDF ND 0.01000 1,2,3,7,8,9-HxCDF ND 0.01000 1,2,3,4-TCDD-13C 2.00 NA Total HxCDF ND 0.01000 1,2,3,7,8,9-HxCDD-13C 2.00 NA

1,2,3,4,7,8-HxCDD ND 0.01000 2,3,7,8-TCDD-37CI4 0.20 87 1,2,3.6,7,8-HxCDD ND 0.01000 1 1,2,3,7,8,9-HxCDD ND 0.01000 Total HxCDD ND 0.01000

1 1,2,3,4,6,7,8-HpCDF ND 0.01000 Total 2,3,7,8-TCDD 1,2,3.4,7,8,9-HpCDF ND 0.01000 Equivalence; 0.00 ng/m2 Total HpGDF ND 0.01000 (Using ITE Factors)

1,2,3,4,6,7,8-HpCDD ND 0.01000 Total HpCDD ND 0.01000 OCDF ND 0.02000 OCDD ND 0.02000

Cone = Concentration (Totals include 2,3,7,S-substituted isomers). I = Interference EMPC = Estimated Maximum Possible Concentration E = PCDE Interference ) LRL = Lower Reporting Limit ND = Not Detected J = Concentration detected is below the calibration range NA = Not Applicable P = Recovery outside of target range NC = Not Calculated A = Detection Limit based on signal-to-noise measurement • = See Discussion

Report No.... 02-1056372

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

CITY_21MC100_002889981

NYC-WTC_000223243