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TABLE 1 <br /> Hazard Exposure Guidelines <br /> Substances Cal OSHA(PEL) 1988-89 ACGIH(TLV) <br /> Benzene 10 ppm(TWA) 10 ppm(TWA) <br /> 25 ppm(EXC) 25 ppm(STEL) <br /> 50 ppm (Ceiling) <br /> Toluene 100 ppm(TWA) 100 ppm(TWA) <br /> 300 ppm(Ceiling) 150 ppm(STEL) <br /> Xylene 100 ppm(TWA) 100(TWA) <br /> 150 ppm(STEL) <br /> Ethyldibromide 20 ppm(TWA) .045 ppm(TWA) <br /> 30 ppm(Ceiling) .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 />