WTC Daily Report Memo, Oct 30, 2001

NYC 9/11 Public Portal Document oct 31 2001 10^33 P.06

New York State Departmeat of Labor PoMic Ems^oyee Safety & HeaStb Bureau J* State OfISce Campus, Bldg #12, Rm ISS ASbaoyv NY 12240 ■ »'•'•■

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Jqb tide • Sawujkd Kesdlte '..' S5^S^Ssk3684!fl6240i5i^ S5sasBfc» P-l Siftutg 95 AsbasteW 0.023 fifcc’ 0.1 £'« Ppiiccotso Ckw <0.002 fcc'^ BMlMWUVWXaiBbCIStt BBWMianKBfiBxaia c=5:ia>KaBixmw^^

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P-2 Sifting 90 Total Dust ND <0.280 njg/bf Stssg/M’ Poticemaja Crew Total Quartz Silica <“0.053 WM’ 0.1

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fftK “ Fibers p«r Cubic Cartnoetor TWA = Tnne WdgtUod Avttage Pia, « Penmsibie Kxposurn Limit PESO » Nr$ Puhlic£ui^k)yae$8toty acid Heahh Bureau mg/M’ NA ♦ = Xndtoatos t^L respireMe Ihrelm of ^licfe boxcver, msopie waft for jetol silica. % «P«rcanl < ''Less Than <„ Less TTw or Equal To

Analytical Medtad #x total dust is hased onNTOSH 0^00 Analytical Me(l»d tor sifica is Used on OSHA10143 snd NIOSH 75W * = Sample result based on anjdytkal luctluxl MOSH 7400. This method atiiwes Phase Contrsst Microscopy (PCM) wbteh cevants AiX FIBERS }<^v tSsaa ? jiecroiw to length aurf haw a fcogto to wwhb ndiu equal to w floater then 3:1. * - SatUf^e resuit bAM^ no analytical ateihqd MOSH 7402. This rosthod latittzes Trfflasnawsion Etoctron Mieroscepy (TEM) to idnotify and cfoantify ftabi^stos fibers presem.

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