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

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Laboratory report detailing PCM microscopy fiber analysis data for asbestos air samples from the NYC Law Department project.

NYC-WTC_000174419
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NYC 9/11 Public Portal Document

SciLWob#: 202032648 Pa Of 14

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 (Hters/min.) (min.) (liters) (Fibers/mm ) (Fibers/cc)

01 GS-3/14/02-OSHA-0365 3/14/02 2 360 720 too 15 19.11 0.010 Ceasar Rodriguez Footnotes: 1 02 GS-3/14/02-OSHA-0366 3/14/02 2 360 720 100 19 24.20 0.013 Fabian Pereyra Footnotes: 1 03 GS-3/14/02-OSHA-0367 3/14/02 2 300 600 100 7 8.92 0.006 Ceasar Rodriguez 04 GS-3/14/02-OSHA-0368 3/14/02 2 300 600 NA Fabian Pereyra Footnotes: 3 05 GS-3/14/02-OSHA-0369 3/14/02 0 0 0 100 0.5 0.64 Blank Footnotes; 2 06 GS-3/14/02-OSHA-0370 3/14/02 0 0 0 100 0.5 0.64 Blank Footnotes: 2 Reporting Notes: (1) Moderate to heavy particulate matter is present on the filter which may obscure some fibers causing results with a low bias. (2) Fibers/cc cannot be calculated for samples (or blanks) with no air volume. (3) Analyst was unable to quajififiraJjefconi itratit^because of overloading of particulate material on the filter. Analyzed by; Tatyana Grimchal^^^^^u(^*rf^ : Date Analyzed; 3/16/02 Samples analyzed by NIOSH 7400(A)W»OT3fafi^^ /94; Limit of Detections 5.5 fibers per 100 fields or 7 fibers/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 area = 0.00785 mni2: 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_000174419

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NYC-WTC_000174419Source: NYC Law Department, mirrored locally

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