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Table I <br /> Hazard Exposure Guidelines <br /> .................................................................................... ............................................................................................................ <br /> SUBSTANCESCAL OSHA <br /> 1988-89 ACGIH <br /> ....................................................................................................................................................................................................................- <br /> PEL <br /> TLV <br /> .. <br /> .................... .............................. ................................................. .............................................................. <br /> Benzene10 ppm (TW) 10 ppm (TWA) <br /> ............................................ .................................................................................... <br /> ......................25..ppr...n..(EI...X....Q......................... ................25..pp..rn...(.S...T....F....L...) <br /> ................ <br /> 50 ppm (Ceiling) i <br /> ........................................................... ......................................................................................................................................I...................... <br /> ..................................................... .............................................................................................................................................................. <br /> Toluene <br /> 100 ppm (TWA) i 100 ppm (TWA) <br /> .................................................... .......................................................................................................................................................... <br /> 300 ppm (Ceiling) 150 ppm (STEL) <br /> ..................................................... .............................................................................................................................................................. <br /> .............-... .......... ..................... ................................................................................... <br /> ..........................I......................................... <br /> Xylene 100 ppm (TWA) 100 ppm (TWA) <br /> ................ ............................. ...................................................................................................................................................... <br /> ............................................ ..................................................................................... <br /> ................150 ppm (STEL) <br /> ......................................................... <br /> ............................................... ................................................................................... <br /> ......................................................................... <br /> Gasoline <br /> 300 ppm (TWA) i 300 ppm (TWA) <br /> ................................................... ....................................................................................I.......................................................................... <br /> 500 ppm (STEL) <br /> ..................................... .............................................................................................................................................................. <br /> ......................................................... ............................................................................................................................................................ <br /> Etheldibromide <br /> 5 ppm (TWA) <br /> .......................................................... ...................... ....................... .................................................. <br /> 30 ppm (Ceiling) 13 ppm (STEL) <br /> .................................................................... . .......... <br /> ......................................................... <br /> 50 ppm (5 min. max peak) <br /> ..................................................................................................................................... <br /> .................... <br /> .............. ............................................................... ......................................................................... <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 />