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

NYC 9/11 Public Portal Document

SciL #: 202021828 Pag of 1 Client Name: TRC Environmental Corporation Phase Contrast Microscopy (PCM) Fiber Results 35052-0000-00007; NYC Law Department; 100 Chruch Street / OSHA Flow Air Fiber Fibers SciLab Client Dat® Rate Duration Filtered Density Cone. Fields Fibers TWA Sample # Sample # / Location Collected (Hters/min.) (min.) (liters) (Fibers/mm^ ) (Fibers/cc)

01 GS-2/8/02-STEL-0501 2/8/02 2 30 60 NA Marion Hendy Footnotes: 2 02 GS-2/8/02-STEL-0502 2/8/02 2 60 120 100 3 3.82 <0.022 Mike Luna 03 GS-2/8/02-STEL-0503 2/8/02 0 0 0 100 0.5 0.64 Blank Footnotes: 7 04 GS-2/8/02-STEL-0504 2/8/02 0 0 0 100 0.5 0.64 Blank Footnotes: 7 Reporting Notes: (1) Fibers/cc cannot be calculate^ondamples (or blanks) with no air volume. (2) Analyst was unable^ lUi fntri ttoft-because of overloading of particulate material on the filter. Analyzed by: Tatyana Grimchak.—:; 1____ ; Date Analyzed: 2«/02 Samples analyzed by NIOSH 7400(. '1; 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 f Id are! 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 (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_000174425