NYC-WTC_000232866

NYC 9/11 Public Portal Document

NYC Response Asbestos Air Sampling Results tor WTC Extended Network Sampling Date and Time: 01/21/02 1200 to 2400 and 01/20/02 1200 to 2130 <«> Data Validation Date: 01/25/2002

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'

01/21/02 ^093-18-01 ie Park Row 1296 Air 8.92 0.003 0 0 <16.00 <0.0048 01/21/02 ^093-19-011 Clambers Stre 1270 Air <7.0 <0.002 0 0 <16.00 <0.0049 01/20/02 ^093-15-0113 anhattan IS 1140*** Air <7.0 <0.002 0 0 <13.33 <0.0045 01/21/02 ^094-09-01 O^ironx PS #15- 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/21/02 ^096-12-01 ICjeens PS#1i 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/21/02 ^095-98-011 Cjoklyn PS #2 1090*** Air <7.0 <0.002 0 0 <13.33 <0.0047 01/21/02 ^097-18-0107 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<^>: not analyzed for TEM ****‘ Chrysotile Sample volume is below recommended limit for TEM analysis ****‘ Chrysotile <’> The sampling date is 1/20/02 for sample 7093-15-0113 due to previous lack of access 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) Q Standard criteria: EPA 40CFR Part 763 (AHERA): 0.01 fiber/cc (PCM), 70 S/mm", volume 1200 L, tor 25 mm filter (TEM) H

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NYC-WTC_000232866