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

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SciLab 202023406 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 i SciLab Client Rate Duration Filtered pidds Fibers Density Cone. TWA I Sample # Sample # / Location Collected (liters/min.) (min.) (liters) (Fibers/mm^ ) (Fibers/cc)

01 GS-2/22/02-STEL-0618 2/22/02 2 30 60 NA Ceasar Rodriguez Footnotes: 2 02 GS-2/22/02-STEL-O619 2/22/02 2 30 60 NA Ruben Reyes Footnotes: 2 03 GS-2/22/02-STEL-B1 2/22/02 0 0 0 100 0.5 0.64 Blank Footnotes: I 04 GS-2/22/02-STEL-B2 2/22/02 0 0 0 100 0.5 0.64 Blank Footnotes: / Reporting Notes; (1) Fibers/cc cannot be calculated for sami lesTrir blanks) with no air volume. (2) Analyst was unable to quanli^ :il [je^nff^^bemsaof overloading of particulate material on the filter. Analyzed by: Tatyana Grimchak_____ — __ Analyzed: 2/23/02 Samples analyzed by NIOSH 7400(A) Method,’ 8/15/94; Limit ofDetec(ion= 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 mini: 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 UCLto 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 (N YSDOH ELAP Lab # 11480): National Institute of Standards and Technology Accreditationrequirements mandate that this report must not be reproduced except in full without the approval of the laboratory. AIHA # 102843.

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