Document qmVb0JVGDqoQzZa9a751OM6YG

cha;3em csnstsuctio:: AS2ESTOS CUST EXPOSURE CSNTKOr. Wovaaber 20, 1967 Th oraliainary personnel monitoring survey carried out Burin* Ausuit 1967, on Chsabers Work* confiraid *rli*r environmental surveys (Rf. I and 2) on Chambers Work* and In ch Spruanca Shop* which demonstrated that th* total particle count, not corraettd for asbestos contant, do** not axeaad on* par cant of th* eurrant Thrathold Limit Value iltV) aatabllihad for a*b**toa du*t by th* American Confarane* of Governmental Industrial Hygienists (ACGIH-1966). Th* paraonnal monitor samnles vara eollaeead In filtars ovar four to flv* hour parlod*. Sine*, iaoingers vara not employed, eh* rasslrabla fraction cannot b* a*tin*tad but can b* ignored as tha total oarelcl* count 1* many order* of aatnleud* lata chan tha aatabllahad TtV. However, chasa results should not serve as a basis for comolacancy bue rather should provide a base for establishing a permanent monitoring program. Federal sad Seat* (1.*., Wav Jersey) legislation anaetad over tha paat tan years has placed tha burden of proof for continuous confomance with aatabllahad TLV'a on eh* employer. In view of this as]or shift in responsibility for soblsne air duality control and tha trends in condensation elala decisions, aa affective Industrial Hygiene program becomes istparaelra. This responsibility bacosaa acuta whan prs-enploymanc medical examinations ara not available for eha employees. S Standards for equipment performance and ventilation specifications should ba aatabllahad aa soon aa possible to Incorporate those current oraetlcs* and design faaeuras which by ehasa surveys have demonstrated effective dust 101 DOF 0900873 DU 022271 1 -2- ettisslon control. Vorli orocedure* and protective equiomanc requirements l*o should b formalised to orovlds not only an Internal operating itandard for oehar dtoartaents of tha Du Pont Company but alio for the guldanca of oueslda contractors araoioyad by Du Pant undar contract. A permanent duality control program is recommended eo provide not only quantitative data for intarnal avaluation of duae control afficiancy, but also eo document air quality analysis nsadad to demonstrate eonformanea with established TLV's and provlda effective defense la lltlsnclon cases. Under current conditions a continuous dally monitoring program does not appear to be necessary or desirable. However, a formal program for sampling and analysing tha work atmosphere with a frequency which will include all phases of asbeseos usage should be established and consistently administered for as long as a TLV for asbestos remains in force. In general, ones a month should suffice for general work areas. If circum stances which involve unusual dust generation should arise, special monitoring will ba required to evaluate tha poeanelal exposure severity. Insofar as possible, personnel oonleory (eeapling equipment carried by a selected employee continuously during hie work esslgnaeat) should be tnployed. Only in this Banner can a truly raoreaantttivs staple of tha atmosphere inhaled by tha employee during hie eight-hour work day be obtained. Such equipment is available and hat been aopllad successfully on Chaeherp Harks, A further requirement for an effective monitoring prograa will Include the aeoloymaac of fully qualified (preferably certified) Industrial Hygienists to directly conduct collection of the staples and to carry out the dust counting. Tha documentation of fiald notes and analytical rasulcs and the oreparaclon of ranorta also should be the responsibility of the Industrial Kygianiat. DUp 09008TA DU 022272 -3- Souinnane Specifications A Station Sanolins - Porcaole (P.ef. "Air Survey" Xesarandun of October 21, 1966). 1. The 'Freon-12" powered "L'nleo Constant Rata Uni-Jst Air Satwler" or the ''Unico Autesatie Uni-Jet Air Saaplar" fittad with an improved standard nidgat laeinger ("Unico 2000") ia sarlas with an 0.8 mleroa nora aisa "Millipora" filtar (Cat. Ho. MAWG037A0) la aeeaotabla for uaa ia all explosion hazard araaa and was usad la tha eollactloa of staples raportsd la oart cma of cha Chambers Work* and Soruanca Works surveys (Ref. 1 and 2). Tha saasla oust ba eollaetad at a uni font standard * 0.1 cuble faat par ninuca rata (Cfa), and at laast ona cubic foot of air should ba aaapled. Thasa units will oearaea unactandad for ehraa to four hours. A dry saaplar, cha "Unleo Modal 2.3 Rasplrabla Dust Saaplar" could ba usad to saoaraca tha rasolrabla froa cha nenrasplrabla fraction, but is net recognized bv cha Aabascoa Taxtlla Institute. 2. as ao alternate tha rechargeable battery powered "Unico :iodel 440 :tighcy Mica Air Saanlar" nay ba used. This Midget. somoler was used successfully for personnel oonieortng on Chanbars Works (Part 3). For emission hazard areas, tha slightly larger "Talaatic" ttodal 133 sanolins unit aguiaoed with an intrinsically safe (Factory "'utual aooroval) battery circuit is raecnmended. Clthar of theta units oarfora satisfactorily with either tha "Milliner*" filter alone or in aarlta with tha acandard Midget lmoinger or tha nawar tierolaoinger (personnel aonlcoring). Four to fire hour* of sanolins at 0.1 Cfta will ba delivered oar single battery charts. Longer periods will ba obtained at lower saapllng raeas with either the fllear alone (0.0S Cfa) or cha nleroiaoingtr (3.02 Cfa). Larger capacity batteries ere available. OOP Q90087S DU 022273 .4. Eouiomant Specifications 8. Personnel Monitoring (Continued) 1. The "Unleo Model 440 Mlshey-Mlte Air Sanpler" tor non-axoloslon hazard areas or the Modal ISO "Ttloatle" for explosion hazard limitations is tha lnacruaanc of choiet (aaa A-2). In the ntar futura a third model (440-A-SP) equipped with total voluaa readouc will ba avallabla. For total duae cause only eha "'tilllsora" fllear 1* required for iaaala eollaeeios. Uhara raaplrabla a* vail as eoeal count ia raquirad, tha microieplnqer la uaad In sarlas with eha fllear. Vhichavar system la alaeead, tha collaceion daviea ahould ba locatad aa closely aa possible to tha man'a breadline zona without ineerferin* with his worlt aaalqnsanea. 2. Aa aa alternate solution eo tha saapllaq problem in axoloslon hazard locations, eha Modal UIC-17S "Oai-Jet Air Saapitr" fitead with a 6 al'Oriflca oar ba subseleutad for eha battery ooaratad pump. Mowovar, wlehout additional calibration for usa with tha nlerolaolnuar, dust eollaeeioa would ba llaiead to filter operation. A ona pound ehacta of "Frton-12" will activate tha sampler for four to flva hours and aspirate a five to six cubic foot samoit. Cj ^iv,A. A. L. (.inch Medical Division REFEgtCa 1. Thatcher. 1. V. - ''Ineeris Report - Aibastos Survey" - Janusrv 27, 1947, addressed eo K. D. Xeueer. Division Safety Sunarlntandane, Construction Division - Louviats lulldinn 2. Thatehar, 1. 7. "Asbestos Survoy - Interim Ranart (Results of Soruaaea Construction Survey)" - April 11, 1947, addrassad to it. 3. Uaunar (address ss In U. 00p 0900875 DU 022274