NYC-WTC_000229439

NYC 9/11 Public Portal Document

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

^aceAnalytical Tel: 612-607-1700 Fax: 612- 607-6444

Method 8290 Blank Analysis Results Client - ATC

Lab Sample ID BLANK-1588 Matrix WIPE Filename U20502B_04 Dilution NA Total Amount Extracted 1 m2 Extracted 04/24/2002 ICAL Date 04/16/2002 Analyzed 05/02/2002 23:12 CCal Filename(s) U20502B_02 & U20502B_12 Injected By BAL

Native Cone EMPC LRL Internal ng's Percent Isomers ng/m2 ng/m2 ng/m2 Standards Added Recovery 2,3,7,8-TCDF ND 0.0020 2,3,7,8-TCDF-13C 2.00 44 Total TCDF ND 0.0020 2,3.7,8-TCDD-13C 2.00 50 1,2,3.7,8-PeCDF-13C 2.00 43 ] 2,3,7,8-TCDD Total TCDD ND 0.079 0.0020 0.0020 2,3,4,7,8-PeCDF-13C 1,2,3,7,8-PeCDD-13C 2.00 2.00 41 47 1,2.3,4,7,8-HxCDF-13C 2.00 66 1,2,3,7,8-PeCDF ND 1,2,3,6,7,8-HxCDF-13C 1 2,3,4,7,8-PeCDF ND 0.0100 0.0100 2,3,4,6,7,8-HxCDF-13C 2.00 2.00 58 59 Total PeCDF ND 0.0100 1,2,3,7,8,9-HxCDF-13C 2.00 59 1,2,3.4.7,8-HxCDD-13C 2.00 67 1,2,3,7,8-PeCDD ND 0.0100 1,2,3,6,7,8-HxCDD-13C 2.00 61 Total PeCDD ND 0.0100 1,2,3,4,6,7,8-HpCDF-13C 2.00 62 1,2,3,4,7,8,9-HpCDF-13C 2.00 64 1.2,3,4,7,8-HxCDF ND 0.0100 1,2,3,4,6,7,8-HpCDD-13C - 2.00 68 ) 1,2,3,6,7,8-HxCDF ND 0.0100 OCDD-13C 4.00 59 2,3,4,6,7,8-HxCDF ND 0.0100 1,2,3,7,8,9-HxCDF ND 0.0100 1,2,3,4-TCDD-13C 2.00 NA Total HxCDF ND 0.0100 1,2,3,7,8,9-HxCDD-13C 2.00 NA 1,2,3,4,7.8-HxCDD ND 0.0100 2,3,7,8-TCDD-37CI4 0.20 53 1,2,3,6,7,8-HxCDD ND 0.0100 1,2,3,7,8,9-HxCDD ND 0.0100 Total HxCDD ND 0.0100 1,2,3,4,6,7,8-HpCDF ND 0.0100 Total 2,3.7,8-TCDD 1,2,3,4,7,8,9-HpCDF ND 0.0100 Equivalence: 0.000022 ng/m2 Total HpCDF ND 0.0100 (Using ITE Factors) 1,2,3,4,6,7,8-HpCDD ND 0.0100 Total HpCDD ND 0.0100 OCDF ND 0.0200 OCDD 0.022 0.0200 J

Cone = Concentration (Totals include 2,3,7,8-substituted isomers). 1 = 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.... 02-1056079

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

CITY_21MC100_003797481

NYC-WTC_000229439