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

NYC 9/11 Public Portal Document

SciLa #: 202021512 Page of 1 Client Name: TRC Environmental Corporation Phase Contrast Microscopy (PCM) Fiber Results 35052-0000-00007; N.Y.C. Law Dept.; 100 Church Street, New York (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 2 ) (Fibers/cc)

01 GS-OSHA-0401 2/6/02 2 30 60 100 8 10.19 0.065 Joshua Figueroa's S.T.E.L. 02 GS-OSHA-0402 2/6/02 2 30 60 100 10 12.74 0.082 Daniel Reilly's S.T.E.L. 03 GS-OSHA-0403 2/6/02 0 0 0 100 0.5 0.64 Blank Footnotes: 7 04 GS-OSHA-0404 2/6/02 0 0 0 100 0.5 0.64 Blank Footnotes: 7 Reporting Notes: (1) Fibers/cc cannot he calculat^ for samples (or blanks) with no air volume. Analyzed by; Devin Ahvea5?i^< _________ ! Date Analyzed; 2/6/02 Samples analyzed by NIOSH 7400(A) Method, Issue #2, 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 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_000174424