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

NYC 9/11 Public Portal Document Sci b#: 202032755 P 1 of 1 ■>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- TWA Fields Fibers Sample # Sample # / Location Collected (Uters/min.) (min.) (liters) (Fibers/mm^ ) (Fibers/cc)

01 GS-3/16/02-OSHA-0207 3/16/02 2 390 780 100 12 15.29 0.008 Miguel Reynoso 02 GS-3/16/02-OSHA-0208 3/16/02 2 390 780 100 4 5.10 < 0.003 Wilfredo Ramirez 03 GS-3/16/02-OSHA-0209 3/16/02 0 0 0 100 0.5 0.64 Field Blank Footnotes: / 04 GS-3/16/02-OSHA-0210 3/16/02 0 0 0 100 0.5 0.64 Field Blank Footnotes: 1 Reporting Notes: (1) Fibers/cc cannot be calculated te ^ler^^anks) with no air volume. Analyzed by; Tatyana Grimchak Date Analyzed; 3/18/02 Samples analyzed by NIOSH 7400(A) >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 fibcrs/sq mm of filter area: ND=No fibers observed: NA= Not Analyzed; Walton-Beckett graticle field area = (HX)785 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 ODl 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. AMA # 102843.

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