Asbestos air monitoring lab results, 100 Church Street, Mar 2002

NYC 9/11 Public Portal Document

Sci b#: 202032129 Pa 1 of 1 Client Name: TRC Environmental Corporation Phase Contrast Microscopy (PCM) Fiber Results 35052-0000-00007; New York City Law Department; 100 Church Street/OSHA Flow Air Fiber Fibers SciLab Client Date Rate Duration Filtered Fibers Density Cone. TWA Fields Sample # Sample # / Location Collected (liters/min.) (min.) (liters) (Fibers/mm^ ) (Fibers/cc)

01 GS-3/9/02-OSHA-0341 3/9/02 2 420 840 too I 1.27 < 0.003 Mike Green 02 GS-3/9/02-OSHA-0342 3/9/02 2 420 840 100 9 11.46 0.005 Wilson Bueno 03 GS-3/9/02-OSHA-0343 3/9/02 0 0 0 100 0.5 0.64 Field Blank Footnotes: 1 04 GS-3/9/02-OSHA-0344 3/9/02 0 0 0 100 0.5 0.64 Field Blank Footnotes: 1 Reporting Notes: (1) Fibers/cc cannot be jhlago^^itJwKrair volume. Analyzed by: Anthony Hinton _ U__ Date Analyzed; 3/12/02 Samples analyzed by NIOSH V ;A) Methoa, Issue Ajmit of Detections 5.5 fibers per 100 fields or 7 fibers/nun2: This report relates ONLY to the sample analysis expressed as fibers/sq mm of filter area: ND=No fibers observed: NA= Not Analyzed; Walton-Beckett graticle field area = 0.00783mm2' 'A = 8 Hr TWA calculation assumes zero exposure for remainder of 8 hr period not sampled: Upper 95% Confidence limit (Employers Compliance Test)- Calculated as a one sided UCL to determine 95% certainty of compliance with the 0.01 fiBBriscj dard: Estimated relative standard deviation; Intralab Sr=0.405, Interlab Sr=0.45, New York samples (NYSDOH ELAP Lab # 11480); National Institute of Standards and Technology Accreditation requirements mandate that this report must not be reproduced except in full without the approval of the laboratory. AIHA # 102843.

NYC-WTC_000174416