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Table 1 <br /> Hazard Exposure Guidelines* <br /> ............................................. ............................ ...... . . . .................................................. <br /> SUBSTANCESCAL OSHA 1988-89 ACGH-1 <br /> ......................................................... ....................................................... .................................................................I............................. <br /> PELTLV <br /> .............................................................. ...................................................................................................................................................... <br /> Benzene 10 ppm (TW) 10 ppm (TWA) <br /> .............................................................. ............................................................................................................................................................. <br /> 25ppm (EXC) 25 ppm (STEL) <br /> .............................................................. ............................................................................................................................................................ <br /> 50 ppm (Ceiling) <br /> ........................................................ .................................................................. ................................................................................. <br /> .......................................................................................................................................... .............1-1-1...................................................... <br /> Toluene100 ppm (TWA) <br /> 100 ppm (TWA) <br /> ..................................................... ............................................................................................................................................................. <br /> 300 ppm (Ceiling) <br /> 150 ppm (STEL) <br /> .......................................................... ............................................... . . . .....................................................................................- <br /> ........................................................... ......................................................... ......................................................................................... <br /> Xylene 100 ppm (TWA) <br /> 100 ppm (TWA) <br /> ....................................................... ............................................................................................................................................................. <br /> 150 ppm (STEL) <br /> ...................................................... ............................................................................... ..................................................................... <br /> .............................................................. ............................................................11................................................................................................ <br /> Gasofine300 ppm (TWA) 300 ppm (TWA) <br /> ..................................................................................................................................................................................................................... <br /> 500 ppm (STEL) <br /> ........................................................................................................................................................................................................................ <br /> .........................................................................................................................................................................------------------------------------------------- <br /> Etheldibromide <br /> 20 ppm <br /> .045 ppm (TWA) <br /> .............................................................. ......................................... ........................................................... <br /> 30 ppm (Ceiling) .13 ppm (STEL) <br /> .............................................>..--------.... - - <br /> 50 ppm (5 min. max peak) <br /> ............................................ ...........................................;............................................................................... <br /> ............................---.......................... .............................................................................................................................................................. <br /> Tetraethyl Lead .075 mg/m3 <br /> 1 .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 /> 4 <br />