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Table 1 <br /> Hazard Exposure Guidelines <br /> a <br /> SUBSTANCES........._........:........._............._CAL OSHA...........................;........_._..1988-89 ACGII�............... <br /> PEL TLV <br /> ............................................................ ........................................................................................................................—............................. <br /> . <br /> Benzene 10.ppm (TW) 10 m A <br /> ............................................... ........................................................_pp....._ ..._�................. <br /> ........................................... ..........>..... ..............25.1?p!..!._(EXC)........................€..............._25.ppm (STEL)................. <br /> ........................................................... .................................... ..(Ceiling).....................! <br /> .........................................................p. <br /> Toluene 100 ppm (TWA) 100 m TWA <br /> ................................ .................................;........................._Pp................. .................... <br /> 300_ppm (Ceiling) 150 m STEL <br /> ...................................................... . ....................pp....._..............._................. <br /> ............................................................ ........................................................................................................................................:....... .. <br /> Xylene 100 m TWA <br /> ........................... ........................................_pp...............................................;................100.ppm..(Twn)................ <br /> ..................................................................................................... 150 Ppm (STEL)............... <br /> ............................................................................................................................................................... <br /> Gasoline............_..................... ) 300 pPm.. ). <br /> ....................;.............._300 ppm (TWA) .........._.. <br /> ........................... ......................... ............................................................ ..................................._SOO ppm (STEL)............... <br /> .............. .......................................................................................... <br /> Etheldibromide20 ppm (TWA) :045pPm ..TwA <br /> ....................... ......... ................... ....................._ .......................:............... ._ ....... ... ............. <br /> .... <br /> 30 ppm (Ceiling) .13ppm (STEL) <br /> ................... ....................................._ _ ................ <br /> ............... <br /> 50_ppm (5 min:. max p�) <br /> .. ..................................................................................... <br /> Tetraethyl 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 /> 4 <br />