Air quality analysis report, 22 River Terrace, Sep 2001

NYC 9/11 Public Portal Document

SciLab Job #: 201092865 Page 3 of 3 Client Name: GCI Environmental Advisory, Inc. Phase Contrast Microscopy (PCM) Fiber Results NOI-B4086; Rockrose Development Corp.; 22 River Terrace; NYC; CLEARANCE Flow Air Fiber Fibers SciLab Client Date Rate Duration Filtered Density Cone. Fields Fibers 2 TWA Sample # Sample # / Location Collected (liters/min,) (min.) (liters) (Fibers/mm } (Fibers/cc)

27 -9/23-27 9/23/2001 15 60 900 100 2 2.55 < 0.003 "AS 28 X9/23-28 9/23/2001 15 60 900 100 3 3.82 < 0.003

Reporting Notes: (1) Fibers/cc cannot he c;ticuLacd it , amples (or blanks) with no air volume. An fuzed by; C styann Cr _ ~_ Date Analyzed- 9/24/2001 _

Samples analyzed tw NIOSIt "4t D.' \i .!rod, Issue #2, 8/15/94; Limit of Dectection= 5.5 filers per 100 fields or 7 fibers/mm2; This report relates ONLY to the sample ass vsis expressed as fibers/sq mm of filter area; ND = no fibers observed; NA = not analyzed; Walton-Iiccke r adi~ u!c fly '.:! rued 0.00785 mm2; TWA =8 Hr T\r: A calculation :s',surnes zero exposure for remainder of 8 hr period not sampled; Upper 957 Confidence limit (Employers Compliance Test)- Calculated as a one sided UCL to determine 95%certainty of compliance .kith the 0.01 fiber/cc standard; Estimated relative standard deviation: Intralab Sr=0.405, lnterlah Sr=0.45, New York samples lNYSDOI1 FLAP Lab #11480); National Institute of Standards and Technology A,+...~.3:...•:.+.. .o...,. «....,...rr ..,.....t.,.m •U.,• .w...........- ..,,.,.r ...,. ho ~o.......i,.--- ----....,, f..tt ,.... ,..,,r •i,.. .,....-..,,..1 ..t .hn t., f,~mr,.... .~ N w H tfi ~0.i'l

NYC-WTC 000120919