NYC-WTC_000227084

NYC 9/11 Public Portal Document Pace Analytical Services, Inc. 1700 Elm Street-Suite 200 Minneapolis, MN 55414

'ace Analytical Tel: 612-607-1700

Method 8290 Blank Analysis Results Client - ATC

Lab Sample ID BLANK-1579 Matrix WIPE Filename F20424B_03 Dilution NA Total Amount Extracted 1 m2 Extracted 04/18/2002 ICAL Date 04/12/2002 Analyzed 04/24/2002 21:11 CCal Filename(s) F20424A_14 & F20424B_14 Injected By BAL

Native Cone EMPC LRL SinterngD 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 68 Total TCDF ND 0.00200 2,3,7,8-TCDD-13C 2.00 66 1,2,3,7,8-PeCDF-13C 2.00 70 2,3,7.8-TCDD ND 0.00200 2,3,4,7,8-PeCDF-13C 2.00 67 Total TCDD 0.013 0.00200 1,2,3,7,8-PeCDD-13C 2.00 68 1,2,3,4,7,8-HxCDF-13C 2.00 95 1,2,3,7.8-PeCDF ND 0.01000 1,2,3,6,7,8-HxCDF-13C 2.00 77 2,3,4,7,8-PeCDF ND 0.01000 2,3,4,6,7,8-HxCDF-13C 2.00 78 Total PeCDF ND 0.01000 1,2,3,7,8,9-HxCDF-13C 2.00 67 1,2,3,4,7,8-HxCDD-13C 2.00 93 1,2,3,7,8-PeCDD ND 0.01000 1,2,3,6,7,8-HxCDD-13C 2.00 82 Total PeCDD ND 0.01000 1,2,3,4,6,7,8-HpCDF-13C 2.00 74 1,2.3,4,7,8,9-HpCDF-13C 2.00 53 1,2,3,4,7,8-HxCDF ND 0.01000 1,2,3,4,6,7,8-HpCDD-13C 2.00 62 1,2,3,6,7,8-HxCDF ND 0.01000 OCDD-13C 4.00 49 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 74 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

I Report No.... 02-1055822

I

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

CITY_21MC100_002898160

NYC-WTC_000227084