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PCM fiber results, 100 Church Street, Feb 2002

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Laboratory report documenting PCM fiber counts from ambient air monitoring at 100 Church Street on February 20, 2002.

NYC-WTC_000174384
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NYC 9/11 Public Portal Document

Sci IL ob#: 202023226 r VI

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

01 GS-022002-ASB-0509 2/20/02 5 240 1200 100 21 26.75 0.009 5th Floor 02 GS-022002-ASB-0204 2/20/02 5 240 1200 100 2 2.55 < 0,002 2nd Floor Rm 314 03 GS-022002-ASB-0205 2/20/02 5 240 1200 100 27 34.39 0.011 2nd Floor Rm 318 04 GS-022002-ASB-0675 2/20/02 5 300 1500 100 28 35.67 0.009 6th Floor Northeast Side Of Hallway 05 GS-022002-ASB-0676 2/20/02 5 300 1500 100 32 40.76 0.010 6th Floor-Northwest Side Of Hallway 06 GS-022002-ASB-B1 2/20/02 0 0 0 100 0.5 0.64 Blank Footnotes: 1 07 GS-022002-ASB-B2 2/20/02 0 0 0 100 0.5 0.64 Blank Footnotes: J Reporting Notes: (1) Fibers/cc cannot bycib^^te^orsaQlgiis for Wanks) with no air volume. Analyzed by: Marvin BrothersDate Analyzed: 2/22/02 Samples analyzed by NIOSH 7400(A) Method, Issue #2, 8/15/94: Limit of Detections 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: Lipper 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 tliat this report must not be reproduced except in full without the approval of tlie laboratory. AIHA # 102843.

NYC-WTC_000174384

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NYC-WTC_000174384Source: NYC Law Department, mirrored locally

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