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Table I <br /> Hazard Exposure Gujidenes* :, <br /> ....................................................... .................................................................................... <br /> SUBSTANCES CALOSHA 1988-89 ACGI <br /> .............--......................T............................................................................................................................................................. <br /> PELTLV <br /> ............................................. .............................................................................................................................................................. <br /> Benzene 10 ppm (TW) 10 ppm ('IVA) <br /> ................................................... .....................................4...................................................................................................................... <br /> 25 ppm (EXC <br /> 25 ppm (STEL) <br /> ....................................................... ...........................................................)......... ............. .................................................................. <br /> 50 ppm (Ceiling) <br /> .......................... ........................................................................................................................................................................................ <br /> ...................................................... .................................................................................. ............................................................... <br /> Toluene 100 ppm (TWA) 100 ppm (TVA) <br /> .......... ...................................................... ........................................ .................................... <br /> .............................................. <br /> 300 ppm (Ceiling) 150 ppm (STEL) <br /> ........................................................ ................-............................................................... <br /> ........................................ ..............................................4............................................... .................................................... <br /> 100 ppm ('IVA) <br /> Xylene 100 ppm OVA) <br /> ........................... ...................... ................................................................................................................................................. <br /> 150 ppm (STEL) <br /> ........................................................ .................................................................................. ............................................................... <br /> ................................................................................................................................................ ............................................................... <br /> Gasoline 300 ppm (TWA) 300 ppm (TWA) <br /> ...................................................................................................................................................................................................4.................... <br /> 500 ppm (STEL) <br /> .......... .................. ....... ....................................... ................ .......................i.............................................4............................ <br /> ................................. ......... ........... ................. .......... .............. ............... ........... .................................................... <br /> Etheldibromide <br /> 20 ppm..En)...................... .045 ppm ('IVA) <br /> ........................................................ . ..................................................................... <br /> 30.................................... ppm (Ceiling <br /> .13 ppm (STEL) <br /> .......................... <br /> 50 ppm (5 min. max peak) I <br /> ........................................................... ......................................................................................................................... ................ ............ <br /> ............................................................. .................................................................... .......................4.........................I........... <br /> Tetraethyl Lead .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 />