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Table 1 <br /> Hazard Exposure Guidelines* <br /> SUBSTANCESCAL OSHA 1988-89 ACGM <br /> PEL TLV <br /> ..................................................... ........................................................_...........................-...............................—......._..._............._. <br /> Benzener10 PP? (TW) 10 ppm (TWA) <br /> ........................_............ ....... ............_ ......................._................_ ........... <br /> ................................................... <br /> 25.PPm (EXC) 25 ..._m.(STEL)...._......-.-.. <br /> ......S�.Ppm (Ceiling).................... .............._..................................... <br /> .............................................................. ......... . ............................................................................................................................................. <br /> Toluene l00 ppm (TWA) 100 m TWA <br /> ............................... ................................................_PP.......(................................ <br /> 300 ppm (Ceilg150 ppm (STEL) <br /> ................................ ................._ ..................-: ............ <br /> .............................................................. .....................................................................................:......................................................................... <br /> . <br /> Xylene......... _100 ppm (TWA)......................:.........................................100 m TWA <br /> ................................ <br /> .150 ppm (STEL)............... <br /> ........... ..... ............ ................................... .................................................... ......................................................... <br /> Gasoline 300 ppm (TWA) 300 ppm (TWA) <br /> .........._............................_......................................................................................_......................................................................_..................... <br /> 500 ppm (STEL) <br /> ................................................-------------------...................................................................:...................................._._................................. <br /> Etheldibromide20 ppm (TWA) .045 ppm (TWA) <br /> 30 ppm (Ceiling) .13 ppm (STEL) <br /> ....................... .....................................A.....................................................................................1.......................... ....... ............... ................ <br /> 50 ppm (5 min. max peak) <br /> ._............_._....._4-...__..._......................................................................_......................................................................... <br /> . <br /> ............................................. • - ..._...._................................................... <br /> Tetraethyl Lead075 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 />