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Table 1 <br /> Hazard Exposure Guidelines <br /> SUBSTANCESCAL OSHA 1988-89 ACGIH <br /> .................................................................................. . . <br /> PELTLV <br /> .............................. ........'.....................................................................................;.............................................. ....................... <br /> Benzene 10 ppm (TW) 10 ppm (TWA) <br /> ...............I......... ............;....................................................................................................................... ................................... <br /> 25 ppm (EXC) 25 ppm (STEL) <br /> ......................................... . .... ........................... ......................................................:.......................................................................... <br /> ........................ .................50 PPn? (Ceiling).-..-..-..-..-.--...' <br /> ..................---------------------------------------<............................................................................................................................................ <br /> Toluene 100 ppm (TWA) 100 ppm (TWA) <br /> ............ .............................................:............................................................. ........................................................................I...................... <br /> 300 ppm (Ceiling) I50 ppm (STEL) <br /> ..................................................... ...................... .. .................................................._;...........--- --_......... ......_...... ..__.......... <br /> ............................ ..................... ............................... .__....__..........._......._.......................................................................................... <br /> Xylene 100 ppm (TWA) 100 ppm (TWA) <br /> ...................................................................................................... ...............;.......................................................................... <br /> 150 ppm (STEL) <br /> ................. ...................................... ..........-..................................................... .................<-......................................................................... <br /> Gasoline 300 ppm (TWA) 300 ppm (TWA)................ <br /> .......................................... .....................,-...-......... . . . <br /> 500 ppm (STEL) <br /> ----------------------_,............................t........................................................ ...... <br /> .............................................................. ........._................................_...._..................................;............._..__._......_........._.._.........._......-_...... <br /> Etheldibromide 20 ppm (TWA) .045 ppm (TWA) <br /> 30 ppm (Ceiling) .13 ppm (STEL) <br /> _........................................................... ............................................................................................................................................................... <br /> 50 ppm (5 min. max peak) <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 />