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Table I <br /> Hazard Exposure <br /> ............................... ................................................. .................................. .............. ........ <br /> SUBSTANCES i CAL OSHA 1988-89 ACG <br /> ............................................... T .............................................................................................................................................. <br /> ... ......................................... ..................................PEL...............................................................................TLV.......................................... <br /> 10 ppm (TWA) <br /> Benzene 10 ppm <br /> _M9-....................... <br /> .......... ............................................... ............................................ ............I........... ................... <br /> 25 ppm (EXQ 25 ppm (STEL) <br /> ................ <br /> .............................................. .................................................................................. ....................................................... <br /> 50 ppm (Ceilm <br /> ............. <br /> .............. .................................................. .... .......................... ........................................................... <br /> ............................. <br /> ................................................................................................................................................................................................................ <br /> Toluene <br /> 100 ppm 100 ppm (TWA) <br /> .....................1........................--.-. <br /> ...............-.................... ........................................... ....................... .................. <br /> 300 ppm (Ceiling) 150 ppm (STEL) <br /> .................... .......................... ................. .............I-IIIIIIIIIIIIIIIII-I...... <br /> .................................................. ............................................... .............................. ...................................--............................... <br /> Xylene 100 ppm..!��.A.)...................... 100 ppm (TWA) <br /> ........................................... ........................................... <br /> 150 ppm (STEL) <br /> ................................................... ............................................................................................................................................................. <br /> ................. .............................. ....................................................................................... ......................................................................... <br /> Gasoline300 ppm (TWA) 300 ppm (TWA) <br /> .....................................................;............................................................................................................................................................... <br /> 500 ppm (STEL) <br /> ........................................................................................................................................................................................................................... <br /> ................................................................................................................................................................... ..................................-.... <br /> Etheldibromide 20 ppm (TWA) <br /> .045 ppm (TWA) <br /> ................ ...................... ................................................................................ ......................I................................. <br /> 30 ppm (Ceiling) .13 ppm (STEL) <br /> ...................................................... ............................................................................. .................................................................. <br /> 50 ppm (5 min. max peak) 1 <br /> ............................................. . ......................................................................................... <br /> ..................................................... ............................................................................................................................................................... <br /> Tetraethyl Lead <br /> .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 />