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Table 1 <br /> Hazard Exposure Guidelines* <br /> SUBSTANCES CAL OSHA 1988-89 ACGIH <br /> ...............................................................__......._.__.__._.._._._.._._......................................................_.._._.........................._........................................................................................ <br /> PELTLV <br /> ........................................................................_..................................................................................................................__.._.........._................................_.................................................... <br /> IW <br /> Benzene .10..P..P_m... ........____. _. _. ._...._.._._10..P..Pm.. ........................ <br /> (EX_.................................................................25..PPm... C)......... .......................25..p <br /> : . ..ah - <br /> ........................_...................................................._.._;_.__.._...................................................................................._.............._;_................................................................................................ <br /> Toluene '.............................1_.O...P.P_m_.� A�............__. _._._. ._..................100..P..Pm... A�...................... <br /> ....................................................._............._...._...:. <br /> __.._. __............................300..I?Pm._�Ceilin .......__._. ................................................................. _. <br /> ........................................_..........................._..._.._.................._........................................_........................._._._...._.......... ................................................................................................. <br /> ..Xylene..........................._................._.......€._.........._............._100..PP..m... A�......_._. _100..PP..m...� A)..._.._.......... <br /> ............._.......__.. ... <br /> ......................................................_........................................................................._150 <br /> ........................................................_..............._. <br /> ... <br /> .............P.P..m...1STEL�...................... <br /> ...:.... <br /> Gasoline .............................300..PPm... ..._._.._.. <br /> ..................._.................300..P..Pm..� A�...................... <br /> ............................................_..................._...........:. <br /> ................_...__• _ ..._.__.._......500.PPn?..1STEL)......._............. <br /> ......................................................._..................._...................................._.._............................................_..........._............_.................................................................................................. <br /> Etheldibromide 20 PPm... `��.............._...._. .... ....:045..P ..m.. �'........................ <br /> .............................................................._..................................._......... _.,. _... ... <br /> _30.PPm...�Ceilin .............._. _....... :13 PPm..�STEL�....................... <br /> .............................._.................._...........__..__ .__._............ .... ......:................................ <br /> ..........._.........50.. m..�5..min...m�.. ..peak)................................................................................................................. <br /> Tetraethvl Lead .075 mg/m3 .075 mg/m3 <br /> All of the above are compounds that may be encountered during excavation. Common sense dictates when levels are such that extra <br /> protection is necessary. <br />