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Table 1 <br /> Hazard E osure Guidelines* <br /> SUBSTANCES CAL OSHA 1988-89 ACGIH <br /> PEL _ TLV <br /> �._ <br /> Benzene 10�pm (T ) 10 ppm (�- � <br /> 25 22m (F-Xq <br /> - 3a --- <br /> Toluene -_ <br /> 100-22E!-=- . 100 ��....-._...... <br /> 300 pprn (Ceiling) 150-P1n? <br /> Xviene _-----_ 100 PPM 100 ppm (TWA) <br /> A) <br /> 130 ppm (STEL) -- <br /> Gasoline 300 ppm =A) 300 ppm I-N <br /> - - 500 ppm(STEL) - <br /> E theldibroraide 20 ppm (TWA) .043 ppm (T%�` <br /> 30 m Ceilirt .13 QPM (STEL) <br /> _. p�C_.__���_._ �_�.��_. ....- _._._.._ <br /> 30 ppm (S min. max <br /> ..................._. . <br /> Teuaerh�•I Lead .015 mz/m3 .013 me/m3 <br /> -ill of the above tie compounds chat may be encountered dutiug excavation. Common sense dictates when levels are such that cx= <br /> proce_don is aecessaty. <br />