NYC-WTC_000234178

NYC 9/11 Public Portal Document

NYC Response Asbestos Air Sampling Results for WTC Extended Network Data Vaiidation Date; 05/13/02 Sampling Date and Tims: 5/6/2002 1200 to 2400 PCM by NiOSH 7400 TEM ( AHERA) Sampiing Sampling Sample Structures (#j Date Sample No. Location Volume Matrix f/mm’ f/cc O.Sp - 5(1 5|4 S/mm^ S~f/cc** 05/06/02 7093-18-0221 Park Row 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 05/06/02 7093-19-0221 Chambers Street 1336 Air <7.0 <0.002 0 0 <16.00 <0.0046 05/06/02 /093-15-0218 I.S. 143 Manhattan 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 05/06/02 7094-09-0207 P.S. 154 (Bronx) 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 05/06/02 7096-12-0215 P.S. 199 (Queens) 1408 Air <7.0 <0.002 0 0 <16.00 <0.0044 05/06/02 /095-98-0215 P.S. 274 (Brooklyn) 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 05/06/02 i’097-18-0211 P.S. 44 (S I) 1406 Air <7.0 <0.002 0 0 <16.00 <0.0044

Key; ‘Structure (S) roughly equivalent to fiber (f) w ** Sample volume is based on pump reading G *** Some Sample volume is below recommended limit for TEM analysis 03 G **** Chrysotile M O NR - analysis not requested H NS - Sample not submitted for analysis H n/a - Not applicable O 23 23 O H M O o H o s a o 23 s NIOSH 7400; Fiber Analysis of Air Samples via NiOSH 7400, Revision 3, issue 2, 8/15/94 a H Asbestos Fiber Analysis by Transmission Eisetran Microscopy (TEM) ERA 4GCFR Part 763 (AHERA) M 23 > Standard criteria; EPA 40CFR Part 763 (AHERA): 0.01 fiber/cc (PCM), 70 S/mm', volume 1200 L, for 2S mm filter (TEM) s o to

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NYC-WTC_000234178