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Table 1 <br /> Hazard Exposure Guidelines <br /> SUBSTANCES <br /> CALOSHA1988-89 ACGIH <br /> PEL TLV <br /> ........... <br /> Benzene <br /> 10 M.gW <br /> 10 Mn_(rW <br /> 25 ppm <br /> ppm- <br /> (STFL) <br /> ..........--— . <br /> .......... <br /> 50 ppm (Ce <br /> .............. <br /> ............. <br /> Toluene 100 Ppm <br /> 300 <br /> Xylene 100 ppm (TWA) 100-ppm (TWA) <br /> 150 <br /> P.P-!R2TKQ.......... <br /> ---------- <br /> ............. <br /> Gasoline <br /> pp ( <br /> .. . <br /> ............. i 500 m STEL) <br /> Etheldibromide 20 ppmTWAJ <br /> 04-52pmTgWAj- <br /> 30 ppm—(Ceiling <br /> .13 ppm DEL <br /> 50 ppgl <br /> _(LrLiia- max <br /> .................. <br /> Tetra!!hLl Lead .075 MS/m3 .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 /> prowction is necessary. <br />