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Table 1 <br /> Hazard Exposure Guidelines* <br /> .............._._.... _..... ....__ <br /> SUBSTANCESCAL OSHA .._1988-89 ACGIH...................... <br /> .........._....—.............................................................PEL.......................__._..............................._..................._TLV.................................. <br /> ...._. <br /> Benzene ...............I10 PPm...�T ......_. ._...................— .............. <br /> '.................._......_ 25 PP_m_..( ............-.-_ .._.__ -._........._..._Z.... m...CSTEL).....---.......... <br /> ...50..PPn'..(Ceilin ................._..._........ <br /> Tol .............................. <br /> .............._........_.......... __._...._.._. <br /> 300.PP..m...�Ceilin ...................._._...............__._1_ Q..P.Prn...� TEI)........_............ <br /> ...................._....._..............................................................................................................._.._......_..........__......._............_........................................................................_......... <br /> Xylene _ _. __100...PP..m. N.._......_.....__._....;...._....__......._100..P..Pn.S ...... <br /> _................................................_...............:......._.........................................................................................._............,. <br /> ........._I S ..PPn'...CSTELI...................... <br /> Gasoline 300..PP �.... ....................__. NO-Ppm .A)........ <br /> 500..pp. <br /> '?...STEL)...................... <br /> .............................-...........................-......_...._...._....__....................-....................__.............................................................._._..................................................................................... <br /> Etheldibromide-----. ._.._..........._........._20...P..P..!n.EWA)..._............_.......... ....................:045.P.2.m._.(TW-A)............... <br /> . ............... ....._..................... ...........................30..PPn..(Ceilin ............._..................................... 13..P.p (STE..... ........... <br /> _..._.............._......_................................_5 ..PP..m._(S min..._mas..Pet ')...............t..............................-................................................................ <br /> Tetraethyl Lead 075 mg/m3 .075 <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 /> S <br />