NYC-WTC_000202108

NYC 9/11 Public Portal Document

Pace Analytical Services, Ino. 1700 Elm Street - Suite 200 Minneapolis, MN 554-14

^ceAnalvticar Tel: 612-607-1700

Method 8290 Blank Analysis Results Client - ATC

Lab Sample ID BLANK-1476 Matrix WIPE Filename U20227A_04 Dilution NA Total Amount Extracted 1 m2 Extracted 02/19/2002 ICAL Date 02/26/2002 Analyzed 02/27/2002 10:43 CCal Filename(s) U20227A_01 &U20227A_14 Injected By MASB

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 78 Total TCDF ND 0.00200 2,3,7,8-TCDD-13C 2.00 72 1,2,3,7,8-PeCDF-13C 2.00 83 2,3,7,8-TCDD ND 0.00200 2,3,4,7,8-PeCDF-13C 2.00 78 Total TCDD ND 0.00200 1,2,3,7,8-PeCDD-13C 2.00 76 1,2,3,4,7,8-HxCDF-13C 2.00 84 1.2,3,7,8-PeCDF ND - 0.01000 1,2,3,6,7,8-HxCDF-13C 2.00 75 2,3,4,7,8-PeCDF ND - 0.01000 2,3,4,6,7,8-HxCDF-13C 2.00 77 Total PeCDF ND - 0.01000 1,2,3,7,8,9-HxCDF-13C 2.00 89 1,2,3,4,7,8-HxCDD-13C 2.00 74 1,2,3,7,8-PeCDD ND 0.01000 1,2,3,6,7,8-HxCDD-13C 2.00 78 Total PeCDD ND 0.01000 1,2,3,4,6,7,8-HpCDF-13C 2.00 77 1,2,3,4,7,8,9-HpCDF-13C 2.00 78 1,2,3,4,7,8-HxCDF ND 0.01000 1,2,3,4,6,7,8-HpCDD-13C 2.00 76 1,2,3,6,7,8-HxCDF ND 0.01000 OCDD-13G 4.00 63 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 78 1,2,3,6,7,8-HxCDD ND 0.01000 1,2,3,7,8,9-HxCDD ND 0.01000 Total HxCDD ND 0.01000

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 HpCDF 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 2,3,7,8-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.... 02-1053890

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

CITY_21MC1OO_OO539O264

NYC-WTC_000202109