NYC-WTC_000202402

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 ASSOCIATES

Lab Sample 1D BLANK-2231 Matrix WIPE Filename U21008B_05 Dilution NA Total Amount Extracted 1.00 m2 Extracted 09/29/2002 ICALDate 08/06/2002 Analyzed 10/09/2002 00:50 CCal Filename(s) U21008A_17 &U21008B_16 Injected By MRO

Native Cone EMPC LRL Internal ng's Percent Isomers ng/m2 ng/m2 ng/m2 Standards Added Recovery

2,3,7.8-TeDF ND 0.00200 2,3,7,8-TCDF-13C 2.00 62 ,, Total TCDF ND 0.00200 2,3,7,8-TGDD-13C 2.00 63 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 71 Total TCDD ND 0.00200 1,2,3,7,8-PeCDD-13C 2.00 70 1,2,3,4,7,8-HXCDF-13C 2.00 76 1,2,3,7.8-PeCDF ND —- 0.01000 1.2.3,6,7,8-HxCDF-13C 2.00 88

J 2,3,4.7,8-PeCDF ND — 0.01000 2,3,4,6,7,8-HxCDF-13C 2.00 80 Total PeCDF ND —- 0.01000 1,2,3,7,8,9-HxCDF-13C 2.00 81 1.2,3,4,7,8-HxCDD-13C 2.00 81 1,2,3,7,8-PeCDD ND - 0.01000 1,2,3,6,7,8-HxCDD-13C 2.00 79 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 74 1,2.3,4,7,8-HxCDF ND 0.01000 1,2,3,4,6,7,8-HpCDD-13G 2.00 71 1,2,3,6,7,8-HxCDF ND 0.01000 OCDD-13C 4.00 59 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-37GI4 0.20 69 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.....1061865

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

CITY_21MC100_003272457

NYC-WTC_000202402