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PCM fiber results lab report, NYC Law Department, Mar 2002

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Laboratory report documenting polarized light microscopy fiber analysis results for ambient air samples submitted to the NYC Law Department.

NYC-WTC_000174329
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NYC 9/11 Public Portal Document

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

01 GS-ASB-21302-0662 2/13/02 5 270 1350 100 45 57.32 0.016 6th Floor At WS-6-181a 02 GS-ASB-21302-0663 2/13/02 5 265 1325 100 1 1.27 < 0.002 5th Floor At WS-5-140 03 GS-ASB-21302-0664 2/13/02 5 240 1200 100 1.5 1.91 < 0.002 6th Floor At WS-6-173a 04 GS-ASB-21302-0665 2/13/02 5 240 1200 100 1.5 1.91 < 0.002 5tti Floor At WS-5125 05 GS-ASB-21302-0666 2/13/02 0 0 0 100 0.5 0.64 Blank Footnotes: 1 06 GS-ASB-21302-0667 2/13/02 0 0 0 100 0.5 0.64 Blank Footnotes: / Reporting Notes: (1) Fibers/cc cannot (or blanks) with no air volume. Analyzed by; Marvin Brothers Aj * I : Date Analyzed: 2714/02 Samples analyzed by NIOSH 7400(A) Method, Issue #2, 8/15/94: Limit of Detections 5.5 fibers per 100 fields or 7 fibers/iiuiLZ; This report relates ONLY to the sample analysis expressed as fibers/sq rani of filter area: ND=No fibers observed; NA= Not Analyzed; Walton-Beckett gratide 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 with tlie 0.01 fiber/cc standard: Estimated relative standard deviation: Intralab Sr=0.4()5, Interlab SrsO.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.

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NYC-WTC_000174329

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NYC-WTC_000174329Source: NYC Law Department, mirrored locally

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