Air quality analysis report, 22 River Terrace, Sep 2001

NYC 9/11 Public Portal Document

SciLab Job #: 201092829 Page 4 of 4 Client Name: GCI Environmental Advisory, Inc. Phase Contrast Microscopy (PCM) Fiber Results NOI-B-4086; Rockrose Development Corp.; 22 River Terrace, New York, NY Flow Air Fiber Fibers SciLab Client Date Rate Duration Filtered Density Cone. Fields Fibers TWA Sample # Sample 4/Location Collected ( liters/min.) (min.} {liters) (Fibers/mm 2 ) (Fibers/cc)

46 22-9/23-46 9/23/2001 15 65 975 100 7 8.92 0.004 'Room: Kitchen I CAS 47 22-9/23-47 9/23/2001 15 65 975 100 14 17.83 0.007 Room: Kitchen! CAS 48 22-9/23-48 9/23/2001 15 65 975 100 5 6.37 <0.003 P11 doom: Kitchen / CAS 49 22-9/23-49 9/23/2001 15 65 975 100 8 10.19 0.004 ;Room: Kitchen / CAS 50 22- 9/23- 50 9/23/2001 15 64 960 100 4 5.10 < 0.003 Room: Kitchen / CAS Reporting Notes: (1) Fibers/cc cannot he calculalst for samples (or blanks) with no air volume. Analyzed by: Victor Slopac _-- Date Analyzed: 923/-001 ~

Samples analyzed by NIOSII 7400(A) Method, Issue #2, 8/15/94; Limit ofDectection= 5.5 fibers per 100 fi elds or 7 fibers/mm2; This report relates ONLY to the sample analysis expressed as fibers/sq mm of fi lter area; ND = no fibers observed; NA = not analyzed: Walton-Beckett sradicule field area 0.00785 mm2: TWA =8 Fir 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`x+ certainty 01 compliance with the 0.01 fiber/ce standard; Estimated relative standard deviation: lntralah Sr=0.405, Inter lab Sr=0.45, New York samples INYSDOI I FLAP Lab # 11480); National Institute of Standards and Technology

NYC-WTC 000120914