Air quality analysis report, 22 River Terrace, Sep 2001

NYC 9/11 Public Portal Document

SciLab Job #: 201092733 Page 2 of - 2 Client Name: OCT Environmental Advisory, Inc. Phase Contrast Microscopy (PCM) Fiber Results W-134086; Rockrose Development Corp.; 22 River Terrace, NYC /CLEARANCE (Amended 9/29/01) Flow Air Fiber Fibers SciLab Client Date Rate Duration Filtered Density Conc. Fields Fibers 2 TWA Sam ple # P ' # / Location Sample Collected (liters/mm .) (min-) (liters) {Fibers/mm ) (Fibers/cc)

16 X121-58 9/21/2001 15 60 900 100 3 3.82 < 0.003 Apt, om /CAS 17 l/21-59 9/21/2001 15 60 900 100 2 2.55 < 0.003 Apt tom /CAS 18 x,21-60 9/21/2001 15 60 900 100 2.5 3.18 <0.003 Apt; 4AS 19 x/21-61 9/21/2001 15 60 900 100 3 3.82 <0.003 Apt! porn /CAS 20 121-62 9/21/2001 15 60 900 100 2 2,55 <0.003 Apt; SAS Reporting Notes: Analyzed by: Tatyana Grimcltat_ .c~ ~""; Date Analyzed: 912252001

Samples analyzed by NIDSH 74n0 A I Al.nhod. Lwe a', 11 i sitlz; Limit of Dec;ection= 5.5 fibers per 100 fields or 7 fibers/mm2; This report relates ONLY to the sample analysis expressed as fibersisq mm of 71 r area. ND = no f:tiers observed; NA = not analyzed; Walton-Beckett gradicu'e f c!c area 0.00785 nu::; TWA =81Ir TWA calculation assumes zero exposure for remainder of 8 hr period not sampled; Upper 95% Confidence limit (Employers Compliance Tesq- Calculated as a one sided UCL to determine 95% certainty of compliance wit`: the 0.01 fiber/cc standard; Estimated relative standard deviation: Intraiab Sr=4.405, Interlab Sr=.45, New York samples (NYSDOH ELAP Lab # 11480); National Institute of Standards and Technology A..-.n,1,,., r...., .o.+,...®.+.a..r......«r o r1, ,h ;,..o..,,.. .....,t «..e t,, , .,,...4 ®,,,.®..r a. 0.11 ...ri....,* ..£ e,® i.,h,.,,,*....., A rtr A . IO1QA1

NYC-WTC 000120891