NYC-WTC_000234298

NYC 9/11 Public Portal Document

NVC Response Asbestos Air Sampling Results for WTC Extended Network Sampling Date and Time: 01/03/02 1200 to 2400 Data Validation Date: 01/07/2002

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'

01/03/02 ^093-18-009£ Park Row 1360 Air <7.0 <0.002 0 0 <16.00 <0.0045 01/03/02 ^093-19-009£iambers Stre 1350 Air <7.0 <0.002 0 0 <16.00 <0.0046 01/03/02 ^093-15-009enhattan IS #1 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/03/02 ^094-09-008zironx PS #15- 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/03/02 ^096-12-009Sjeens PS #15 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/03/02 ^095-98-0092 joklyn PS #2 1262 Air 7.01 0.002 0 0 <16.00 <0.0049 01/03/02 ^097-18-008£en Island PS 1344 Air <7.0 <0.002 0 0 <16.00 <0.0046

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 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 H l"^

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NYC-WTC_000234298