NYC-WTC_000232926

NYC 9/11 Public Portal Document

NYC Resportss Asbestos Air Sampling Results for WTG Extended Network Data Validation Date; 05/22/02 Sampling Date and Time 5/12/2002 1200 to 2400 PCM by NiOSH 7400 TEM ( AHERA) PCM fibers PCM # fields Sampling Sampling Sample Structures (#) 1 Date Sample No. Location Volums*** Matrix f/mm’ f/cc O.Sp - 5p sp S/mm’ S~f/cc** 05/12/02 093-19-022; lambers Stre 1148 Air <7.0 <0.002 0 0 <13.33 <0.0045 100 13.33 05/12/02 093-1 5-022^ 143 Manhat 1238 Air <7.0 <0.002 0 0 <13.33 <0.0041 100 13.33 05/12/02 094-09-021C S. 154 (Bron 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 100 16.00 05/12/02 095-98-0221 . 274 (Brook 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 100 16.00

No Sample Submitted for Location PS 199- Queens due to low run time No Sample Submitted for Location Park Row and PS 44-Staten Island due to flow fault

Key: ’Structure (S) roughly equivalent to liber (f) ” Sample volume is based on pump reading *” Some Sample volume is below recommended limit for TEM analysis ”” Chrysotile NR - analysis not requested NS - Sample not submitted for analysis n/a - Not applicable

NIOSH 7400: Fiber Analysis of Air Samples via NiOSH 7400, Revision 3, issue 2, 8/15/34 Asbestos Fiber Analysis by Transmission Electron Microscopy (TEM) EPA 40CFR Part 7S3 (AHERA) Standard criteria; EPA 40GFR Part 783 (AHERA): 0.01 fiber/cc (PCM), 70 S/mm^ volume 1200 L, for 25 mm filter (TEM)

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NYC-WTC_000232926