NYC-WTC_000231725

NYC 9/11 Public Portal Document

NVC Response Asbestos Air Sampling Results for WTC Extended Network Sampling Date and Time: 01/02/02 1200 to 2400 Data Validation Date: 01/05/2002

PCM by NiOSH 7400 TEM ( AHERA) Sampling Sampling Sample Structures (#) Date Sampie No. Location Volume (L)" Matrix f/mm’ f/cc O.Su- 5p 5p S/mm® S~f/cc'

01/02/02 ^093-18-0097 Park Row 1326 Air <7.0 <0.002 0 0 <16.00 <0.0046 01/02/02 ^093-19-0097 lambers Stre 1220 Air <7.0 <0.002 p* 0 13.33 0.0042 01/02/02 ^093-15-009£nhattan IS #1 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/02/02 ^094-09-008eironx PS #15- 1388 Air <7.0 <0.002 0 0 <16.00 <0.0044 01/02/02 ^096-12-0091 jeens PS#1S 858*** Air <7.0 <0.003 0 0 <10.00 <0.0045 01/02/02 ^095-98-0091 joklyn PS #2 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/02/02 ^097-18-008£en Island PS 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043

Key: NS: Not sampled ‘Structure (S) roughly equivalent to fiber (f) ** Sample volume is based on pump reading *** Sample volume is below recommended limit for TEM analysis NA<^>: not analyzed due to overloading of particulates NA<i>: not analyzed for TEM ‘ Chrysotile 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 7400: Fiber Analysis of Air samples via NIOSH 7400, Revision 3, Issue 2, 8/15/94 Asbestos Fiber Analysis by Transmission Electron Microscopy (TEM) EPA 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) Q

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NYC-WTC_000231725