PCM fiber results, TRC Environmental Corp, Nov 2001

NYC 9/11 Public Portal Document SciLa #: 202031638 Page Of 1

Client Name: TRC Environmental Corporation Phase Contrast Microscopy (PCM) Fiber Results 35052-0000-00007; New York 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-3/6/02-STEL-0326 3/6/02 2 30 60 too 2 2.55 < 0.045 Wilson Bueno 02 GS-3/6/02-STEL-0327 3/6/02 2 30 60 100 3 3.82 < 0.045 Jose A. 03 GS-3/6/02-STEL-0328 3/6/02 0 0 0 100 0.5 0.64 Field Blank Footnotes: 1 04 GS-3/6/02-STEL-0329 3/6/02 0 0 0 100 0.5 0.64 Field Blank Footnotes: 1 Reporting Notes: (1) Fibers/cc cannot he/culculatsd for sin^s (or blanks) with no air volume. Analyzed by: Marvin Brothers*' jj : Date Analyzed: 3/7/02 Samples analyzed by NIOSH 7400(A) Method, Issue 42, 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/sq mm of filter area; ND=No fibers observed: NA= Not Analyzed: Walton-Beckett graticle field area = 0,00785 mml: 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 So=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 Alli without the approval of the laboratory. AIHA # 102843.

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