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PCM fiber results, 100 Church Street, Feb 2002

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Laboratory report presenting PCM fiber analysis data for ambient air samples collected at 100 Church Street on February 21, 2002.

NYC-WTC_000174386
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NYC 9/11 Public Portal Document

Sci^Prob#: 202023224 Client Name: TRC Environmental Corporation Phase Contrast Microscopy (PCM) Fiber Results 35052-0000-00007; New York City Law Department; 100 Church Street, AMBIENT Flow Ail- 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-21202-ASB-0677 2/21/02 5 360 1800 100 2 2.55 < 0.001 6th Floor-Northeast Side Of Hallway 02 GS-21202-ASB-0678 2/21/02 5 360 1800 100 1 1.27 <0.001 6th Floor-Northwest Side Of Hallway 03 GS-21202-ASB-0679 2/21/02 5 180 900 100 1 1.27 < 0.003 Room 6-3 lOA 04 GS-21202-ASB-0680 2/21/02 5 180 900 100 2 2.55 < 0.003 Room 6-316 05 GS-21202-ASB-0681 2/21/02 0 0 0 100 0.5 0.64 Blank Footnotes: 1 06 GS-21202-ASB-0682 2/21/02 0 0 0 100 0.5 0.64 Blank Footnotes: / Reporting Notes: (1) Fibers/cc cannot for Jai^les for blanks) with no air volume. Analyzed by: Marvin Brothers » 1 Analyzed: 2/22/02 Samples analyzed by NIOSH 7400(A) Method, Issue #2, 8/15/94: Limit of Detection= 5.5 fibers per 100 fields or 7 fibers/nim2: 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 = 0.00785 mm2: 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 widi tlie 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-\/VTC_000174386

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NYC-WTC_000174386Source: NYC Law Department, mirrored locally

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