NYC-WTC_000232882

NYC 9/11 Public Portal Document

NVC Response Asbestos Air Sampling Results tor WTC Extended Network Sampling Date and Time: 01/18/02 1200 to 2400 Date Validation Date: 01/21/2002

PCM by NiOSH 7400 TEM AHERA) Sampling Sampiing Sample Structures (#) Date Sample No. Location Volume (L)“ Matrix t/mm^ f/cc 0.5p - 581 Sp S/mm^ S~f/cc'

01/18/02 7093-18-0113 Park Row 11 84'“ Air <7.0 <0.002 0 0 <13.33 <0.0043 01/18/02 7093-19-0113 Chambers Street 1276 Air <7.0 <0.002 0 0 <16.00 <0.0048 01/18/02 7093-15-0111 Manhattan IS #143 1336 Air <7.0 <0.002 0 0 <16.00 <0.0046 01/18/02 7094-09-01 01 Bronx PS #154 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/18/02 7096-12-0107 Queens PS #199 1148’" Air <7.0 <0.002 0 0 <13.33 <0.0045 01/18/02 7095-98-01 07 Brooklyn PS #274 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/18/02 7097-18-0104 Staten Island PS #44 1324 Air <7.0 <0.002 0 0 <16.00 <0.0047

Key: ‘Structure (S) roughly equivalent to fiber (f) ** Sample volume is based on pump reading Sample volume is below recommended limit forTEM 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, 8/15/94 Asbestos Fiber Analysis by Transmission Electron Microscopy (TEM) ERA 40CFR Part 763 (AHERA) Standard criteria: EPA 40CFR Part 763 (AHERA): 0.01 fiber/cc (PCM), 70 S/mm^ volume 1200 L, for 25 mm filter (TEM)

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NYC-WTC_000232882