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*AE 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 />Table 1 <br />............. ...... .................................... .......................... <br />Hazard Exposure. Guidelines* <br />.......................................................... .......................................................................... <br />SUBSTANCES <br />.............................................................. ................................................. <br />CAL OSHA ............... ......... .................................. <br />1988-89 ACGH-1 <br />........................ .............. <br />............................ ............................... ........................................................ <br />PELTLV <br />............ ................ ................................. <br />I ....................................... <br />Benzene10 <br />.......................................................... ..................................................................................... <br />ppm (TW) ......................................................................... <br />10 ppm (TWA) <br />............................................................ . ............................................ <br />25 ppm (EXQ <br />.................................. ................................................................. <br />25 ppm (STEL) ....... <br />.......................................................................................... <br />50 ppm (Ceiling) <br />-------- ............................................ ......................................................................... <br />..................... ................................... I ...................................................... <br />Toluene100 <br />................................................. ..................................................................................... <br />............................... ......................................................................... <br />ppm (TWA) ......................................................................... <br />100 ppm (TWA) <br />.............................................................. ..................................................................................... <br />300 ppm (Ceiling) ......................................................................... <br />150 ppm (STEL) <br />......................................................... <br />Xylene <br />_............................:.........................a........_............ ............. .......... <br />................................................................................. ....................................................................... <br />100 ppm..!��A) <br />--------------------------- ....... <br />100 ppm (TWA) <br />- - <br />................................................ .......... ................................................................. <br />................... <br />150 ppm (STEL) <br />............ .................................................... <br />..........I......................................................... <br />Gasoline300 <br />......................................................... . ..................................................................................... <br />........................................................................... ......................................................................... <br />ppm (TWA) .......................................................... <br />300 ppm (TWA) .............. <br />.......................... ................................... . ................................................................................. <br />...................................................................... <br />500 ppm (STEL) <br />- <br />................... .............. . ................. ..................................................................................... <br />Etheldibromide <br />........................................................... ................................ <br />.............................................................. <br />20 ppm (TWA) <br />....................................... - - ........................................................... <br />. ......... <br />.045 ppm (TWA) . <br />................................................. ....... -------- <br />30 ppm (Ceiling) <br />............................................................................. ........................................................................ <br />.13 ppm (STEL) <br />..................................... ... ................ <br />50 ppm (5 min. max peak) <br />----- ----- I ---- -- ..................................... .............................. <br />.......................................... <br />......................... <br />jetraethyl Lead <br />..................................................................................... ........................................................ <br />.075 mg/m3 <br />.075 mg/m3� <br />*AE 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 />