PCM fiber results lab report, Aug 1998

NYC 9/11 Public Portal Document

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Client Name: Applied Technology Services, Inc, Phase Contrast Microscopy (PCM) Fiber Results A98113 Flow Air Fiber Fibers SciLab Client Date Rate Duration Filtered Fields Fibers Density Cone. twA Sample # Sample # / Location Collected (ijters/min.) (min.) (liters) (Fibers/mm ) (Fibers/cc)

31 34081198-31 8/11/98 6 200 1200 100 0.5 0.64 < 0.002 3rd Fl.-During-Inside Tent #4 32 34081198-32 8Z11/98 6 200 1200 100 3 3.82 < 0.002 3rd Fl.-During-Inside Tent #4 33 34081198-33 8/11/98 0 0 0 100 0.5 0.64 Field Blank Footnotes: I 34 34081198-34 8/11/98 0 0 0 100 0.5 0.64 Field Blank Footnotes: / Reporting Notes: (1) Fiben/cc cannot be calculated for samples (or blanks) with no air volume. (2) Analyst was unable to quantiNf\ber concentratioirbecause of overloading of particulate material on the filter. Analyzed by: Anthony Hinton^^lLfecJai^JlJiACLipJC—tdliL——.: Date Analyzed: 8/12/98 Samples analyzed by NIOSH 7400(A) METHOD, Issue #2, 8/15/94; Limit of Detection = 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 gradicule field area 0.00785 mm2; Duration in minutes; TWA = 8Hr TWA calculation assumes zero exposure for remainder of 8 hour period not sampled; Upper 95% Confidence Limit (Employer's 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 = 0.270, Interlab Sr = 0.450. ELAP #11480 ' i'h

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