PCM fiber results, 100 Church Street, Jan 2002

NYC 9/11 Public Portal Document

Sci b#: 202013198 Pa of 1 Client Name: TRC Environmental Corporation Phase Contrast Microscopy (PCM) Fiber Results 35053-0000-00004; NYC Law; 100 Church Street Flow Air Fiber Fibers SciLab Client Rate Duration Filtered Fields Fibers Density Cone. twa Sample # Sample # / Location Collected (liters/min.) (min.) (liters) (Fibers/mm'^ ) (Fibers/cc)

01 GSl 1/25/02 4 140 560 100 7 8.92 0.006 Michael Lua's Sample 02 GS2 1/25/02 4 140 560 100 4 5.10 < 0.005 Peter Grimialdi's Sample 03 GS3 1/25/02 0 0 0 100 0.5 0.64 Blank Footnotes: / 04 GS4 1/25/02 0 0 0 100 0.5 0.64 Blank Footnotes: / Reporting Notes: (1) Fibers/cc cannot be caiculat^ for samples'for blanks) with no air volume. Anatoffrthv.-FredCnriroMi 1_ ‘Sc"') : Date Analyzed; 1/25/02 Samples analyzed by NIOSH 7400(A) Method, Issue #2^^713/94; 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 rhm of filter area: ND=No fibers observed: NA= Not Analyzed; WaJlon-Becketl 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, Inlerlab 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_000174397