NYC-WTC_000232883

NYC 9/11 Public Portal Document

NVC Response Asbestos Air Sampiing Results for WTC Extended Network Sampling Date and Time: 01/10/02 1200 to 2400 Data Validation Date: 01/13/2002

PCM by NiOSH 7400 ___________ TEM (AHERA) Sampling Sampiing Sample J/tfucfur&s (#) l Date Sampie No. Location Voiume (L)" Matrix f/mm^ ?/cc 0.5p" 5p S/mm® S-f/cc*

01/10/02 ^093-18-010£ Park Row 1426 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/10/02 ^093-19-01 OEiambers Stre 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/10/02 ^093-15-0103 ihattan PS # 1128"* Air <7.0 <0.002 0 0 <13.33 <0.0046 01/10/02 ^094-09-0093 ronx PS #15- 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/10/02 ^096-12-0099 teens PS#1i 1420 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/10/02 ^095-98-0099 joklyn PS #2 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/10/02 ^097-18-009€en Island PS NS Air NS NS NS NS NS NS

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<^>: not analyzed for TEM ****‘ Chrysotile Sample volume is below recommended limit for TEM analysis ‘ Chrysotile

NR - analysis not requested NS - Sample not submitted n/a - Not applicable

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H l"^ NIOSH 7400: Fiber Analysis of Air samples via NIOSH 7400, Revision 3, Issue 2, 8/15/94 to Asbestos Fiber Analysis by Transmission Electron Microscopy (TEM) EPA 40CFR Part 763 (AHERA) s o Standard criteria: EPA 40CFR Part 763 (AHERA): 0,01 fiber/cc (PCM), 70 S/mm^ voiume 1200 L, for 25 mm filter (TEM) o o I L_ o

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NYC-WTC_000232883