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SUBSTANCES <br />I Benzene <br />I Toluene <br />EM <br />I Gasoline <br />Etheldibromide <br />Tetraethyl Lead <br />Table <br />Hazard Exposure Guidelines <br />CAL OSHA <br />PEL <br />10 ppm (TW) <br />25 ppm (EXC) <br />50 ppm (Ceiling) <br />100 ppm (TWA) <br />300 ppm (Ceiling) <br />100 ppm (TWA) <br />300 ppm (TWA) <br />20 ppm (TWA) <br />30 ppm (Ceiling) <br />50 ppm (5 min. max peak) <br />.075 mg/m3 <br />1988-89 ACGIH <br />TLV <br />10 ppm (TWA) <br />25 ppm (STEL) <br />100 ppm (TWA) <br />150 ppm (STEL) <br />100 ppm (TWA) <br />150 ppm (STEL) <br />300 ppm (TWA) <br />500 ppm (STEL) <br />.045 ppm (TWA) <br />.13 ppm (STEL) <br />.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 />