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Table I <br /> Hazard Exposure Guidelines* <br /> .............................................................. .............................................................................................................................................................. <br /> SUBSTANCES <br /> i CAL OSHA 1988-89 ACG <br /> ..................... .......................................T.....................................................**............................................ ................ .............*.............. <br /> .............................................................. ...................................PEL................................................ ..............................TLV.......................................... <br /> Benzene 10 ppm (TW) <br /> i 10 ppm (TWA) <br /> ................. ...................................... .............................................................................................................................................................. <br /> 25 ppm (STEL) <br /> 25 ppm (EXQ <br /> ................................................................................................................................................................................................................ <br /> 50 ppm (Ceiling) <br /> ....................................................................................................................................................................................................................... <br /> ................................................................................................... .................................... ..........................I.............................................. <br /> Toluene <br /> 100 Ppm 100 ppm (TWA) <br /> .......................................................................................................... ..................... <br /> ..................................I...................................... <br /> 300 ppm (Ceiling) <br /> 150 ppm (STEL) <br /> ............ <br /> ..................................................... ................................................................. ............... ..................................................... <br /> Xylene 100 ppm (TWA) i 100 ppm (TWA) <br /> .................................................... ........................................................................................................................................................ <br /> .......................................................................................................................................... ...............150.............p....pm (STEL)........................................ <br /> ..................................................................................................................................... ....................................................................... <br /> Gasoline300 ppm (TWA) 300 ppm (TWA) <br /> ........................................................ ................................................................................. ...........................I............................................. <br /> 1 500 ppm (STEL) <br /> ...........I...................................................I...................................................................................................................................................... <br /> ...................................................... .......................................I............................................. .................................I...................................... <br /> Etheldibromide20 ppm (TWA) j .045 ppm (TWA) <br /> ............................................... ............................ ........................................................................................................................... <br /> 30 ppm (Ceiling) .13 ppm (STEL) <br /> ............................................. ............ .............................................................................................................................................................. <br /> 50 ppm (5 min. max peak) 1 <br /> ....................................................t.....................................................................................I.......................................................................... <br /> .............................................................. ............................................................................................................................................................... <br /> Tetraethyl Lead <br /> .075 mg/m3 <br /> .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 />