11 JOHN STREET

NYC 9/11 Public Portal Document

m Client Name: Benjamin Kutzhan & Son Control Inc. Phase Contrast Microscopy (PCM) Fiber Results 11 John Street Flow Air Fiber Fibers SciLab Client Date Rate Duration Filtered Densih 2 Cone. H1e1ds 1'ibcr, TEA Sample# Sample #/ Location Collected (literslmin.) (min.) (liters) (1'iberslmm ) (Fibers/cc)

01 01_._._._._._._._._._._._. 08/11/2002 2.5 30 75 100 2 2.55 <0.036 Panel Lui ac P11 02 02 08/11/2002 2.5 480 1200 100 3 3.82 <0.0(Y2 PauelLukac P11 Reporting Notes: Analyzed by: E+ed A. Ci me si ; Date Attulymd: 0812371002 Samples nual}zed by N'IOSH 7400(A) etbod, Issue p2, 8f 15194: Limit aMckr6na= 5.5 6bcea per 100 fields ar 7 fibetztmm2: The repot relates ONLY to the sample analysis eapressed as fbasraq nee of Biter area: ND~o Iibeta obsaved: NA= Not Analyzed; Walton-Hackett gratick field area - 0.00785 non2: TWA = 8 Hr TWA calmlatioo assumes acrd expoeu a for remainder of 8 hr period not sampled: Upper 9596 Confidence limit (Employers Compliance Test)- Calculated as a one sided UCL to dezrau iae 9598 tataiaty of coasJlinvice nith the 0-DI fibericc standud: Estimated relative slaoderd deviation: lotralab SrJ.405, rntetleb Sr=.45. New Yak samples (NYSDOH ELAP Lab 4 114811): Rations b:slitete of Staodasda and Tecfinafogy Aocrarttaion xecldmetoeate mandate that this re{wt natal mot be ze1rodacod except in Ia11 withari the approval of the )abaratnry. ATHA IF 102843.

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