NYC-WTC_000228425

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Lab Sample ID BLANK-1528 Matrix WIPE Filename U20326B_06 Dilution NA Total Amount Extracted 1 m2 Extracted 03/21/2002 ICAL Date 03/25/2002 Analyzed 03/26/2002 20:12 CCal Filename(s) U20326B_02 & U20326B_17 Injected By BAL

Native Cone EMPC LRL Internal ng's Percent Isomerii 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 70 Total TCDF ND -- 0.00200 2,3.7,8-TCDD-13C 2.00 67 1.2,3.7.8-PeCDF-13C 2.00 66 2.3,7.8-TCDD ND 0.00210 A 2,3,4,7,8-PeCDF-13C 2.00 70 Total TCDD ND 0.00200 1,2,3.7,8-PeCDD-13C 2.00 69 1.2,3,4,7.8-HXCDF-13C 2.00 98 1,2.3,7.8-PeCDF ND 0.01000 1,2,3,6,7,8-HxCDF-13C 2.00 94 2,3.4,7,€l-PeCDF ND 0.01000 2,3,4.6,7,8-HxCDF-13C 2.00 95 Total PeCDF ND 0.01000 1,2,3,7,8,9-HxCDF-13C 2.00 83 1,2,3,4,7,8-HxCDD-13C 2.00 113 1,2,3,7.8-PeCDD ND 0.01000 1,2,3,6,7,8-HxCDD-13C 2.00 96 Total PeCDD ND 0.01000 1,2,3,4,6,7,8-HpCDF-13C 2.00 108 1,2,3,4,7,8,9-HpCDF-13C 2.00 94 1,2,3,4,7,8-HxCDF ND 0.01000 1,2,3,4,6,7.8-HpCDD-13C 2.00 102 1,2,3,6,7,8-HxCDF ND 0.01000 OCDD-13C 4.00 87 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 70 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 s 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.... 02-1055017

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

CITY_21MC100_002900521

NYC-WTC_000228442