PCM fiber results lab report, NYC Law Department, Mar 2002

NYC 9/11 Public Portal Document Sci b#: 202023859 P 1 of 1 Client Name: TRC Environmental Corporation Phase Contrast Microscopy (PCM) Fiber Results 35052-0000-00007; New York City Law Department; 100 Church Street, AMBIENT 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-2/27/02-ASB-0306 2/27/02 5 300 1500 100 2 2.55 < 0.002 Rm 3-128 02 GS-2/27/02-ASB-0307 2/27/02 5 300 1500 100 1 1.27 < 0.002 Rm 3-132 03 GS-2/27/02-ASB-0308 2/27/02 5 300 1500 100 1 1.27 <0.002 3rd Floor Hallway East 04 GS-2/27/02-ASB-0309 2/27/02 5 300 1500 100 2 2.55 < 0.002 3rd Floor Hallway West 05 GS-2/27/02-ASB-B1 2/27/02 0 0 0 100 0.5 0.64 Blank Footnotes: / 06 GS-2/27/02-ASB-B2 2/27/02 0 0 0 100 0.5 0.64 Blank Footnotes: } Reporting Notes: (1) Fibers/cc cannot he calculated for samples (or blanks) with no air volume. Analyzed by; Devin AhyeeS^kQjbSsjSf^fiiL_________ ; Date Analyzed: 2/28/02 Samples analyzed by NIOSH 7400(A) Method, Issue #2, 8/13/94: 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 graticlc 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 theO.OI fiber/cc standard: Estimated relative standard deviation: Intralab Sr=0.405, Interlab Sr=0.43, New York samples (NYSDOHELAP 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.

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