Document NE5rMbq6aprBRjOkYVK2JvN3w

Teratology Uaed In OSHA Safety ad Health Standards (29 CFR 1910) Penriulhlr Expaw TJirt (-Hour Hi* tan h lynasymau with the 8-hair time weighted svaage expcsurc Emit. It represents the modmum 8-hair average opasure caacentraticn which may cccur in any 8-hair work shift of a 40 hour wak week. Artfan LrrcJ An 8-baur tone weighted average concentration cf a oanjwnirumt in air (usually equal to 1/2 tto PEL) at which tame provisos cf the tiudaxd apply. Medcal monitoring is required fix sane aonuminants when eqxzure aoeecfc the actios level MH<| The nundmum airbane cosaentraticn not to be acceded Airing any S-hcur wok shift concentration may ady be aceeded if a peak value h tpecifiod by OSHA. hd Expotw Onrentietlaa Amaatimum concaitradai above the ceiling concattratioi to which an anployee may be qposed for e brief period (usually 5*10 ntiouta). AccqjtaNe peak concentration are specified fa only 21 canpaunds. OSHA EXPOSURE LIMITS FOR POTENTIAL BELL SYSTEM AIR CONTAMINANTS 8-Hcur Ceiling Peak 8>HnurPEL Actios Level Ccoflentretien rmowitraticn Asbesta 2 fiber*/an* 0J fibers/an* 10 fibers/an1 Lad SOpg/trf 30 it/a? - * Basne 30mg/irf (10 Bn) SOrng/m* (23 ppm) 160 mgfttp (30 ppm) -7- lib