WTC Daily Report Memo, Oct 19, 2001

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OSHA SAWPWMO RESULTS SUMMARY AS OF lO/IS

Aibest-JS; ' A tote! of 53! air monitoring samples for asbestos have been taksa. Ffotn 9/13 -9/22,^ 177 samples were teken in ths ftnanciai district. They were taken on OSKA personnel sS they walked within certain prsditemiined zones, Ref ults revealed asbestos coacectrations raagiog from ND to .037 fide., well below OSHA’s pcraaissMe expoyi.re limit (PEL) of .1 fioc. A^cf 9/22, sampling focused or, the rubble pile (the keystone area of the map) where 32 of 210 samples exceeded OSHA’s limit via PCM analysis, However, upon Eirther anaiysis using discriminating counting methods and/or TSM analysis, the number of asbestoa Sbers fotind dropped dramatically to below detectable levels or -wsU below .1 free. Sampling al Pier 25 where tricks carrying foe debris arc being cfBoaded by crane to barge revealed do detecable asbestos, ’'A-'-'t.

Carbon Monoxide: Thirty-one personal samples for workers oa the ruhbiepUe showed results ranging from 1 ppm to 34 ppm well below the OSKA 50 ppm permissible exposure Urxiit (

• Noisi: As of 10/14, OSKA baa beeo conducting noise moaitoring tn the rubble pile (the s keystone area of the map). Five pefson&i samples have been conducted on employee: ! performjfig (or worksng near) various operations such asJack hamruentg. Employee’s exposure to the noise range from 84 dBA to S9 dBA. OSHA’s p-ennissible noise exposure for constmetion is 90 dBA SiHca: As of October IS”’, die overwhelming majority of the 16-5 silica sai-aples show no dettotahle levels of aiAame silicx The highest sample result was approximately twice the CSKA limit, whateas &e next hi^faest level was less than half of Axis iitadt. Both of these levels were found on pursonaefworking in the rubble pile; an area where USHA ' cononucs to encourage the use of respiia'cr/ protection. *

VOCs AS 0? Octobej' 18*. OSHA has takas 155 samples for volarils organic compounds (VOCs) such ns scetalcchyie, aarybuilrile* aa-olom.. bengene, 2-buranone, I chloiodiphenyl (PCB), dioxiP, eliyl berseue, fonaaidchyde, hexene, isosyanatas, i(

perehlof&e&ylene, sfr^na, toluene, tric'nlciroethyisae, vinyl chloride and xylens. J Screening saay>les initially showed elevated levels of some organic chemicals resultint d from the tlnss burning io toe rubble pile. Subsequent pcrscwial. and .area samples show , worker exposure isvsls to be below OSHA. limita. Howavec. one personal sample resuJ' ) for beazsae was found to be at the Sir OSKA Allowable Liurz conceptratioa of 1 ppm i This was found ca a backhoe operator meviag debris. * f Metals; As of XO/16, OSHA has tskea 235 afr samples to mcaitor worker exposures to j dusts, fames., oxides, sad other compounds of metals such as actimony, ’ beryliittra, chrouiititt, cobalt, copper, iron, lead, maugaoese, moly'odenum, i nickel, van&ditao, rinc, cadtmum, magnesium, arsenic, and mercury. Result ' from these samples ere generally well below ths appEca’ole OSHA Uotits. i Hewever. torch cutting and burning structural steel at foe pile have resulted b / instances of over exposures as follows: copper (6); iron oxide (6); lead (1); j cadmium (3). Accordingly. OSHA is reccnnncndmg that workers engaged i / these operatioss wear appropriate rcspiratoiy protection.

Otber Analysis: OSHA is sampling for dioxia. isocyanates and oxidas oi oitrogen. Results are pending

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