NYC-WTC_000187479

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NYC Response ■D o c o Asbestos Air Sampling Results for WTC Extended Network CT o oo Sampling Date and Time: 12/06/01 1200 to 2400 Data Validation Date: 12/12/2001 o' "0 o CD PCM by N OSH 7400 TEM AHERA) 03 Sampling Sampling Sample Structures (#) O Volume (Lf f/mm^ 0.5m - Sy S/mm^ o Date Sample No. Location Matrix f/cc 5m S-f/cc* o c 3 CD 12/06/01 7093-18-0070 Park Row 1292 Air <7.0 <0.002 0 0 <16.00 <0.0048 3 12/06/01 7093-19-0070 BMCC 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 12/06/01 7093-20-0070 Coast Guard 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 12/06/01 NS Manhattan PS #143 NS Air NS NS NS NS NS NS 12/06/01 7094-09-0060 Bronx PS #154 1440 Air <7.0 <0.002 T" 0 <16.00 <0.0043 12/06/01 7096-12-0064 Queens PS #199 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 12/06/01 7095-98-0066 Brooklyn PS #274 1440 Air <7.0 <0.002 0 0 <16.00 <0.0043 12/06/01 7097-18-0063 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/mn?, volume 1200 L, for 25 mm filter (TEM) Q

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