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

NYC 9/11 Public Portal Document

Sci b#: 202032412 Pa 1 of J 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 (liters/min.) (min.) (liters) (Fibers/mm^ ) (Fibers/cc)

01 GS-3/12/02-OSHA-0353 3/12/02 2 319 638 100 2 2.55 < 0.004 Miguel Reynoso 02 GS-3/12/02-OSHA-0354 3/12/02 2 319 638 100 1 1.27 < 0.004 Manuel Gonzalez 03 GS-3/12/02-OSHA-0355 3/12/02 2 300 600 100 3 3.82 < 0.004 Miguel Reynos 04 GS-3/12/02-OSHA-0356 3/12/02 2 300 600 100 2 2.55 < 0.004 Manuel Gonzalez 05 GS-3/12/02-OSHA-0357 3/12/02 0 0 0 100 0.5 0.64 Field Blank Footnotes: 1 06 GS-3/12/02-OSHA-0358 3/12/02 0 0 0 100 0.5 0.64 Field Blank Footnotes: 1 Reporting Notes: (1) Fibers/cc cannot ^gcalculated for samples (or blanks) with no air volume. Analyzed by; Devin Ahyee S^Q^V*** _________ ; Date Analyzed: 3/14/02 Samples analyzed by NIOSH 7400(A) Method, ISue #2, 8/15/94; Limit of Detections 5.5 fibers per 100 fields or 7 fibers/mm2: This report relates ONLY to the sample analysis expressed as fibers/^ 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 with the 0.01 fiber/cc standard: Estimated relative standard deviation: Intralab Sr=0.405, Interlab Sr=0.45, New York samples (NYSDQH 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_000174417