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

NYC 9/11 Public Portal Document Sci ob#: 202023227 Pl 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 Rate Duration Filtered Density Cone. Fields Fibers TWA Sample # Sample # / Location Collected (liters/min.) (min.) (liters) (Fibers/mm^ ) (Fibers/cc) 01 GS-022002-OSHA-0203 2/20/02 2 300 600 100 20 25.48 0.016 Manolo Alies 02 GS-022002-OSHA-0519 2/20/02 2 300 600 100 22 28.03 0.018 Miguel Reynoso 03 GS-022002-OSHA-0627 2/20/02 2 300 600 100 3 3.82 < 0.004 Manolo Alies 04 GS-022002-OSHA-0628 2/20/02 2 300 600 100 2 2.55 < 0.004 Miguel Reynoso 05 GS-022002-OSHA-B1 2/20/02 0 0 0 100 0.5 0.64 Blank Footnotes: J 06 GS-022002-OSHA-B2 2/20/02 0 0 0 100 0.5 0.64 Blank Footnotes: 1 Reporting Notes: (1) Fibers/cc cannot he-^cuU^ for sd jes (or Wanks) with no air volume. Analyzed by: Marvin Brothers' U » \ : Date Analyzed: 2/22/02 Samples analyzed by NIOSH 7400(A) Method. Issue 8/15/94: Limit of Detection= 5.5 fibers per 100 fields or 7 fibers/iniii2: 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 fjeld area = 0.00785 nun2: TWA = 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 fiber/cc standard: 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_000174412