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4 I <br /> Table 1 <br /> i I E <br /> Hazard Ex osure Guidelines* k <br /> SUBSTANCES CAL OSHA 1988-89 ACGM <br />( PEL !p TLV <br /> Benzene 10 ppm (TW) ;! 10 ppm (TWA) <br /> 25 ppm (EXC) i 25 ppm (STEL) <br /> 50 ppm (Ceiling) <br /> s <br /> Toluene 100pp m (TWA) 100 ppm (TWA) w <br /> 300 ppm (Ceiling) } i 150 ppm (STEL) <br /> E <br /> Xylene 100 ppm (TWA) i� 100 ppm (TWA) <br /> � 150 ppm (STEL) <br /> f� M <br /> Ir Ii <br /> :i <br /> Gasoline 300 ppm (TWA) 300 ppm (TWA) <br /> 4 i <br /> 500 ppm (STEL) <br /> Etheldibromide 20 ppm (TWA) k .045 ppm (TWA) <br /> 30 ppm (Ceiling) .13 ppm (STEL) <br /> 50 ppm (5 min. max peak) <br /> Tetraethyl Lead .075 mg/m3 a .075 mg/m3 <br /> ;I <br /> *All of the above are compounds that may be encountered during excavation. Common sense dictates <br /> when levels are such that extra protection is necessary. 'e <br /> F <br /> rp j I i <br /> I ;` "r <br /> i� <br /> l <br />