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Table 1 <br /> Hazard Exposure Guidelines <br /> ............................................................................. ................................... <br /> SUBSTANCES <br /> ........................................................ ..........................CALOSHA...........................:...............1988-89 ACG1I3............... <br /> PEL TLV <br /> ..............................................................:.....................................................................................;........................................... <br /> ..Benzene................................................ ................ ......10_PPR!_.. ........................................._10_ppm_(TWA.................. <br /> . m EXC <br /> .......................... ...................._ ........ 25 ppm (STEL) <br /> . ............................. _ <br /> 50 ppm (Ceiling) <br /> ..............................................................t..................._ ............ <br /> ...................................................... . <br /> ..............................................................a ........................ . ..............................................IL........... .............. ..................................... <br /> Toluene.............................................................. ...................._100.ppn!..(T... 100m <br /> .............._pp (TWA) <br /> .. <br /> 300 ppm (Ceiling) <br /> ............................................................ . .........._ . ...................; 150 ppm (STEL) <br /> .............._ ............... <br /> ................ ............................. ......... .................. ..........................................................:.......................................................................... <br /> Xylene .............................. ..... ...................._100 ppm (TWA) 100 m TWA <br /> ..... .._..............................................:........................._pP........................................ <br /> ........................................... ..... ....................... ..........................._............................:............._150 Ppm (STEL) <br /> .............................................................. .....................................................................................:......................................................................... <br /> . <br /> Gasoline 300 ppm (TWA) 300 m (TWA) <br /> .................................................-----z- ..................._....pp <br /> ........................... '..............SOO ppm (STEL) <br /> .....................................................:..................................................................................... <br /> .:.......................................................................... <br /> Etheldibromide _........... ......................20_ppm (TWA) .045 ppm (TWA) <br /> ............................. ._................................................,.......................................................................... <br /> 30 ppm (Ceiling) 13 ppm (STEL) <br /> 50 ppm (5 min. max peak) <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 />