NYC-WTC_000232873

NYC 9/11 Public Portal Document

NYC Response Asbestos Air Sampling Results for WTC Extended Network Data VaUdatlon Date; 02/11/02 Sampling Date and Time 2/7/2002 1200 to 2400 PCM bv NiOSH 7400 TEM ( AHERA) PCM fibers Sampling Sampling Sample Structures (#) Date Sample No. Location Volume* IVIatrix f/mm’ f/cc O.Su-Sp 5F S/mm^ S~f/cc** 02/07/02 093-18-013: Park Row 1246 Air <7.0 <0.002 0 0 <13.33 <0.0041 02/07/02 093-19-013: rambers Stre 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 02/07/02 093-15-013- I.S. 143 1366 Air <7.0 <0.002 0 0 <16.00 <0.0045 02/07/02 094-09-012 S. 154 (Bron 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 02/07/02 096-12-012 !. 199 (Quee 1430 Air <7.0 <0.002 0 0 <16.00 <0.0043 02/07/02 095-98-012' . 274(Brookl 1356 Air <7.0 <0.002 0 0 <16.00 <0.0045 02/07/02 097-18-012' P.S. 44 (S.l) 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 Air <7.0 <0.004 0 0 8.89 0.0048 Air <7.0 <0.004 0 0 <8.00 <0.0053 Air <7.0 <0.004 0 0 <8.89 <0.0048 Air <7.0 <0.004 0 0 <8.89 <0.0048 Air <7.0 <0.004 0 0 <8.89 <0.0048 Air <7.0 <0.004 0 0 8.89 0.0048 Air <7.0 <0.004 0 0 <8.89 <0.0048 Air <7.0 <0.004 0 0 <8.89 <0.0048 Air <7.0 <0.004 0 0 <8.89 <0.0048 Air <7.0 <0.004 0 0 <8.89 <0.0048 Air <7.0 <0.004 0 0 <8.00 <0.0055 Air <7.0 <0.004 0 0 <8.00 <0.0054 Air <7.0 <0.004 0 0 <8.00 <0.0046 Air <7.0 <0.004 0 0 <8.00 <0.0054 Air <7.0 <0.004 0 0 8.89 0.0048 Air <7.0 n/a NA(=^> NA(=^> NA(=^> NA(=^> Air <7.0 n/a NA<^> NA(=^> NA<=^> NA<=^>

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

O NiOSH 7400: Fiber Anaiysis of Air Samples via NiOSH 7400, Revision 3, issue 2, 8/15/94 H Asbestos Fiber Analysis by Transmission Eiectron Microscopy (TEM) EPA 40CFR Part 763 (AHERA) Standard criteria; EPA 40CFR Part 763 (AHEBA): 0.01 fiber/cc (PCM), 70 S/mm’, volume 1200 L, for 2S mm filter (TEM) to s O o o I o Ln to o co co wo Ui

NYC-WTC_000232873