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

NYC 9/11 Public Portal Document

Sci ob#; 202031394 Client Name: TRC Environmental Corporation Phase Contrast Microscopy (PCM) Fiber Results 35052-0(X)0-00007; NYC Law Department; 100 Church Street/Ambient 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-3/4/02-ASB0316 3/4/02 5 330 1650 NA At WS 251 3rd Floor Footnotes: 2 02 GS-3/4/02-ASB0317 3/4/02 5 330 1650 100 3,5 4.46 < 0.002 AtWS 252 3rd Floor 03 GS.3/4/02-ASB0318 3/4/02 5 330 1650 100 4 5.10 <0.002 At Rm 3 326 04 GS-3/4/02-ASB0319 3/4/02 0 0 0 100 0.5 0.64 Blank Footnotes: 1 05 GS-3/4/02-ASB0320 3/4/02 0 0 0 100 0.5 0.64 Blank Footnotes: / Reporting Notes: (1) Fibers/cc cannot be calculated for sai fes (or bl inks) with no air volume. (2) Analyst was unable to quantify fiS»tr ^because of overloading of particulate material on the filter. Analyzed by; Tatyana Gri mchak ; Date Analyzed: 3/5/02 Samples analyzed by NIOSH 7400(A) MetWSts^ 8/15/94; Limit of Detections 5.5 fibers per 100 fields or 7 fibcrs/mm2: 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 ar^= 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 Tesi)« 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 andTechnology Accreditation requirements mandate that this report must not be reproduced except in full without the approval of the laboratory. AMA # 102843.

o H

o I o

Cn Cn

<73

NYC-WTC_000174336