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Table 1 <br /> Hazard Exposure Guidelines <br /> SUBSTANCES ? CAL OSHA a198849 ACGIH <br /> PEL = TLV <br /> Benzene 10 T <br /> PPm ( � 10 ppm (TWA) <br /> 25 ppin (EXC) 25 ppm (STEL) <br /> Pw <br /> 50 ppm (Ceiling) <br /> ft <br /> Toluene 100 ppm (TWA) a 100 ppm (TWA) <br /> 300 ppm (Ceiling) (STEL) <br /> - 150 ppm <br /> Xylene 100 ppm (TW <br /> X l } <br /> .y.................................._.. 100 ppm (TWA)......... <br /> _. a 150 nom STEL <br /> on <br /> Gasoline 300 ppm (TWA) b 300m <br /> pP (TWA) <br /> ) <br /> 500 ppm (STEL) <br /> Etheldibramide w 20 ppm A(T'W m TWA <br /> ............................_.._......._�.. _...............__._-.__.._....._ __._........._.....;. ............045 pp.......�.........__..).. ._...._..- <br /> 30 ppm (Ceiling) 13ppm (S <br /> _............. ._..._.. ....._. __._....._...----_ .---_..--------.._..__...__... -: .._........_.. . ..... _.....TEL) _.. <br /> 50 ppm (5 min , max peak) <br /> mm4mmIm&*ANN**A%*No Avv 0 womm ad Road* otftwow*no&$a OPO won, door ov*&VON a agwa*&4v mo*ww,oav <br /> Tetraethyl Lead . 075 mg/m3 . 075 mg/m3 <br /> 'w 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 />