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TABLE I <br />Hazard Exposure Guidelines <br />Substances Cal OSHA(PEL) 1988-89 ACGIH(TLV) <br />Benzene 10 ppm(TWA) <br />10 ppm(TWA) <br />25 ppm(EXC) <br />25 ppm(STEL) <br />50 ppm (Ceiling) <br />Toluene 100 ppm(TWA) <br />100 ppm(TWA) <br />300 ppm(Ceiling) <br />150 ppm(STEL) <br />Xylene 100 ppm(TWA) <br />100(TWA) <br />150 ppm(STEL) <br />Ethyldibromide 20 ppm(TWA) <br />.045 ppm(TWA) <br />30 ppm(Ceiling) <br />.13 ppm(STEL) <br />50 ppm(5 min. max peak) <br />Petroleum Hydrocarbons No PEL or REL Established <br />Note: All of the above are compounds that may be encountered during excavation. <br />Common sense dictates when levels are such the extra protection is necessary. <br />