NYC-WTC_000234094

NYC 9/11 Public Portal Document

NYC Response Asbestos Air Sampling Results for WTG Extended Network Data Validation Date; 06/03/02 Sampling Date and Time 5/26/2002 1200 to 2400 PCM by NiOSH 7400 TEM { AHERA) PCM fibers PCM # fields Sampling Sampling Sample Structures (#) 1 Date Sample No. Location Volume*** Matrix f/mm’ f/cc O.Sp - 5p sp S/mm’ S~f/cc** 05/26/02 093-18-0241 Park Row 1354 Air <7.0 <0.002 0 0 <f6.00 <0.0045 too 16.00 05/26/02 ’093-f 9-024 lambers Stre 1276 Air <7.0 <0.002 0 0 <16.00 <0.0048 100 16.00 05/26/02 '093-f 5-023f f43 Manhat 1090 Air <7.0 <0.002 0 0 <13.33 <0.0047 100 13.33 05/26/02 094-09-022' S. 154 (Bron 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 100 16.00 05/26/02 096-12-023!; 199 (Queer 1396 Air <7.0 <0.002 0 0 <16.00 <0.0044 100 16.00 05/26/02 095-98-023! . 274 (Brook 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 100 16.00 05/26/02 097-18-023 P.S. 44 (S I) 1214 Air <7.0 <0.002 0 0 <13.33 <0.0042 100 13.33

Key: "Structure (S) roughly equivalent to fiber (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 74Q0: Fiber Analysis of Air Samples via NIOSH 7400, Revision 3, issue 2, 8/15/94 Asbestos Fiber Analysis by Transmission Eiectron Microscopy (TEM) EPA 40CFR Part 7S3 (AHERA) Standard criteria; EPA 40CFR Part 753 (AHERA); 0,01 fiber/cc (PCM), 70 S/mm’, volume 1200 L, for 25 mm filter (TEM)

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NYC-WTC_000234094