Air quality analysis report, 22 River Terrace, Sep 2001

NYC 9/11 Public Portal Document

SciLab Job #: 201092734 Page 2 of '2 Client Name: GCI Environmental Advisory, Inc. Phase Contrast Microscopy (PCM) Fiber Results NOI-B4086; Rockrose Development Corp.; 22 River Terrace, NYC / CLEARANCE (Amended 9/29/01) Flow Air Fiber Fibers SciLab Client Date Rate Duration Filtered Density 2 Fields Fibers Cone. TWA Sample i# Sample # / Location Collected (liters/min.) (mm .) (liters) (Fibers/mm ) (Fibers/cc)

16 -/21-78 9/21/2001 15 60 900 100 2.5 3.18 < 0.003 /CAS 17 19/21-79 9/21/2001 15 60 900 100 4 5.10 <0.003

II loom /CAS 18 L9/21-80 9121/2001 15 60 900 100 2 2.55 <0.003 iCAS 19 ,9/21-81 9/21/2001 15 60 900 100 4.5 5.73 < 0.003

20 0/21-82 9/21/2001 15 60 900 100 4 5.10 <0.003 'CAS Reporting Notes: Analyzed by: T:.tyana Grinrchak __ _;Date Analyzed: 9/22/2081

Samples analyzed by NIOSH 7400(A) Method, Issue #2, 8115194, Limit of Dectecuon= 5,5 fibers per 100 fields or 7 fibers/mm2; This report relates ONLY to the sample analysis expressed as fibershsy nun of fi lter area; ND = no fibers observed; NA = not analyzed; Walton-Beckett gradicule field area 0.6;1785 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 fibericc standard: Estimated relative standard deviation: Intralab Sr=0.405, huerlab Sr=0.45, New York samples (NYSDOH ELAP Lab # 114801; National Institute of Standards and Technology n ..,-..on:..,.;..... ----.:.v..,.,.,... ,......a..... n...: n..:.. ......,... "-- ...,.. —. .......n,.... A ...,..,.., .., s,n .,.:.a,. n,., ...,...,.....,r ..r a... I..i.,..._......, n ru a u 1n~enz

NYC-WTC 000120893