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

NYC 9/11 Public Portal Document

Sci b#: 202023857 Pa of r Client Name: TRC Environmental Corporation Phase Contrast Microscopy (PCM) Fiber Results 35052-0000-00007; New York City Law Department; 100 Church Street, OSHA Flow Air Fiber Fibers SciLab Client Rate Duration Filtered Density Cone. TWA Fields Fibers Sample # Sample # / Location Collected (Uters/min.) (min.) (liters) (Fibers/mm^ ) (Fibers/cc)

01 GS-2/27/02-OSHA-0304 2/27/02 2 300 600 100 8 10.19 0.007 Wilson Bueno 02 GS-2/27/02-OSHA-0305 2/27/02 2 300 600 100 6 7.64 0.005 Jose Adorinno 03 GS-2/27/02-OSHA-0522 2/27/02 2 300 600 100 12 15.29 0.010 Wilson Bueno 04 GS-2/27/02-OSHA-0523 2/27/02 2 300 600 100 6 7.64 0.005 Jose Adorinno 05 GS-2/27/02-OSHA-B1 2/27/02 0 0 0 100 0.5 0.64 Blank Footnotes: / 06 GS-2/27/02-OSHA-B2 2/27/02 0 0 0 100 0.5 0.64 Blank Footnotes: 1 Reporting Notes: (1) Fibers/cc cannot hficalculatedfor samples (or blanks) with no air volume. Analyzed by: Devin Ahyee ■) C»- ; Date Analyzed: 2/28/02 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_000174414