NYC-WTC_000187470

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§o NYC Response “0 I Asbestos Air Sampling Results for WTC Extended Network c o CT o Sampling Date and Time; 01/13/02 1200 to 2400 o o' 00 Data Validation Date: 01/17/2002 "□ o 03 o PCM by N OSH 7400 TEM AHERA) O Sampling Sampling Sample Structures (#) o o c Date Sample No. Location Volume (L)” Matrix f/mm^ f/cc 0.5p - 5p 5p S/mm^ S~f/cc* 3 CD 3 01/13/02 7093-18-0108 Park Row 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/13/02 7093-19-0108 Chambers Street 1344 Air <7.0 <0.002 0 0 <16.00 <0.0046 01/13/02 7093-15-0106 Manhattan IS #143 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/13/02 7094-09-0096 Bronx PS #154 1398 Air <7.0 <0.002 0 0 <16.00 <0.0044 01/13/02 7096-12-0102 Queens PS #199 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 01/13/02 7095-98-0102 Brooklyn PS #274 1090*** Air <7.0 <0.002 0 0 <13.33 <0.0047 01/13/02 7097-18-0099 Staten Island PS #44 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043

Key: *Structure (S) roughly equivalent to fiber (f) ** Sample volume is based on pump reading *** 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)

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