NYC-WTC_000232861

NYC 9/11 Public Portal Document

NVC Response Asbestos Air Sampling Results for WTC Extended Network Sampling Date and Time: 01/07/02 1200 to 2400 Data Validation Date: 01/11/2002

PCM by MIOSH 7400 TEM f AHERA) Sampling Sampling Sample Structures (#) Date Sample No, Location Volume (L)" Matrix f/mm^ f/ec 0,5p - Sp 5p S/mm^ S~f/cc*

01/07/02 7093-18-0102 Park Row 1184*** Air <7.0 <0.002 0 0 <13.33 <0.0043 01/07/02 7093-19-0102 Chambers Street 1256 Air <7.0 <0.002 0 0 <16.00 <0.0049 01/07/02 7093-15-0100 Manhattan PS #143 1338 Air <7.0 <0.002 0 0 <16.00 <0.0046 01/07/02 7094-09-0090 Bronx PS #154 1414 Air <7.0 <0.002 0 0 <16.00 <0.0044 01/07/02 7096-12-0096 Queens PS #199 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/07/02 7095-98-0096 Brooklyn PS #274 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/07/02 7097-18-0093 Staten Island PS #44 1360 Air <7.0 <0.002 0 0 <16.00 <0.0045

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 due to no access to station location n/a- Not applicable

NiOSH 7400: Fiber Analysis of Air samples via NIOSH 7400, Revision 3, issue 2, 8/15/94 o Asbestos Fiber Analysis by Transmission Electron Microscopy (TEM) EPA 40CFR Part 763 (AHERA) H Standard criteria: EPA 40CFR Part 763 (AHERA): 0.01 fiber/cc (PCM), 70 S/nm^ volume 1200 L, for 25 mm filter (TEM) to s o o o Io DOH00270989.XLS

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NYC-WTC_000232861