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Table 1 <br /> Hazard Exposure Guidelines <br /> s <br /> SUBSTANCESCAL OSHA 1988-89 ACGII3 <br /> ..............................................................................................................................................,.......................................................................... <br /> PEL TLV <br /> .............................. ............................................................ ........................................................... .. . ................................... <br /> Benzene10 ppm (TW) 10 ppm (TWA) <br /> ............................................................> ...............................................................................l.......................................................................... <br /> s....................._25 Ppm.(EXC)......................................._25_PP?!?..(STEL)................. <br /> 50 Ppm(Ceili <br /> _............................. ........................................................n ) <br /> ......................................................................-... <br /> ..............................................................h..................................................................................... <br /> b........................................................................ <br /> . <br /> Toluene100 ppm (TWA) 100 ppm (TWA) <br /> ..................................................................................... ................................................................ <br /> 300 ppm (Ceiling) 150 ppm (STEL) <br /> ........................................i.....................................................................................;.......................................................................... <br /> .......................................................i.....................................................................................;.......................................................................... <br /> Xylene100 ppm (TWA) 100 ppm (TWA) <br /> ..........................................................'.....................................................................................:.......................................................................... <br /> 150 ppm (STEL) <br /> ..............................................................'.....................................................................................l.......................................................................... <br /> ..............................................................E.....................................................................................i......................................................................... <br /> . <br /> Gasoline 300 ppm (TWA) 300 ppm (TWA) <br /> ..............................................................h-.........-............ .....................h............................ ........ .............. ................ <br /> 500 ppm (STEL) <br /> .............................................................. .............................................................................................................................................................. <br /> ................................. ........ .....................................................................................i................-.....................................................-..- <br /> Etheldibromide 20 ppm (TWA) .045 ppm (TWA) <br /> ..........--................................................'. ................................................................................;.......................................................................... <br /> 30 ppm (Ceiling) 13 ppm (STEL) <br /> .......................................................................................................................................i.......................................................................... <br /> 50 ppm (5 min. max peak) <br /> ..................................................... .....................................................................................i......................................................................... <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 />