Air quality analysis report, 22 River Terrace, Sep 2001

NYC 9/11 Public Portal Document

SciLab Job #: 201092828 Page 3 of 3 Client Name: GCI Environmental Advisory, Inc. Phase Contrast Microscopy (PCM) Fiber Results NOI-B-4086; Rockrose Development Corp.; 22 River Terrace, New York, NY! CLEARANCE Flow Air Fiber Fibers SciLab Client Date Rate Duration Filtered Density 2 Cone. Fields Fibers TWA Sample P # P # / Location Sample Collected (literslmin.) (min.} (liters) (Fibers/mm ) (Fibers/cc)

31 22-9/22-81 9/22/2001 15 60 900 100 7 8.92 0.004 koom: Kitchen/CAS 32 22-9/22-82 9/22/2001 15 60 900 100 7 8.92 0.004 Room: Kitchen! CAS 33 22-9/22-83 9/22/2001 15 60 900 100 14 17.83 0.008 koom: Kitchen / CAS 34 22-9/22-84 9/22/2001 15 60 900 100 6 7.64 0.003 koom: Kitchen / CAS 35 22-9/22-85 9/22/2001 15 60 900 100 4 5.10 < 0.003 Zoom: Kitchen/CAS 36 22-9/22-86 9/22/2001 15 60 900 100 5 6.37 < 0.003 Room: Kitchen / CAS 37 22-9/22-87 9/22/2001 15 60 900 100 7 8.92 .0.004 Room: Kitchen / CAS Reporting _Notes: (1) Fibers/cc cannot be alculatgd for sam les (or blanks) with no air volume. Analyzed by: Victor Slopac ; Date Analyzed: 9/23/2001

Samples analyzed by NIOSH 7400(A) Method, Issue d2, 8/15/94; Limit of Dectection= 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 gradicule 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: lntralab Sr- 0.405, Interlab Sr=0.45, New York samples (NYSDOH ELAP Lab 4511480); National Institute of Standards and Technology A ......o.l:,.. a:.....e....:.o ..................i.,,e ,1.... ,t,:.. .e..rt........r ...., he ..e.......1......A e....s..r :.. l..il ..,:, ...., +u........ __,...1 ..F ,I.., I../,.._,.,..... A ril A N 1l1'lOA

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