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Table 1 <br /> Hazard EsP..........__osure Guidelines* <br /> ............................._..-_.. .._......._............_...................._....................._.................._................ <br /> ......._...._......................... <br /> SUBSTANCES CAL OSHA 1988-89 ACGIH <br /> PEL TLV <br /> Benzene _.._..._......_.....10...2Pn'...�T� ...........................:...._!..._............._._10..PP.m...(.T��'1. ......................... <br /> _25...PP..m...(EFC)........_. '3..ppm.:(STEL)-_.................. <br /> _......?O..PP._m...�Ceilin ................ - <br /> ..........................................................................._..._...----._.........................................._......................._........ <br /> .».................._............... <br /> ................................_.._.........._......... <br /> Toluene 10O...P.Pk''._(T\�'.' ) . 100...PPm (Tnx'J....................... <br /> ........_._............................_........................., ...__...........,......_. _ . <br /> ......_._.._........._300...PP.m.(Ceiling......................._......................_I O..PP..tn (STEL)...................... <br /> Yvlene -..........__......................__100..PP..TD.�T��.A�........................._._:....._._.._..._100...EP.m (Iti ' �.............._.... <br /> . <br /> _........__...........__..._......_.. _ ---......................._._. _;_._..._..._......1SO pPm (STEL)...................... <br /> _..._...__............................_........__............._...................._....._............._....._................................................»..................................................._..__................................ <br /> ....... <br /> Gasoline 300...P.P..m._(T� .: �..................._. 300._L?P..[T._(T� .: )........ <br /> 500 PPm._(STEL).................... <br /> .........._............_ ....................... -...._..._...................................._..................................................................._........................... <br /> Etheldibromide ......_._20...hP..m...gN.,�)............__......._..................._.....0`�_5..P..Pm_''TI.X* �)..._................. <br /> ......._..._30..PP..m (Ceilinug�......_..... 13..PP..m._(STEL).__._.._.._....... <br /> ....................._.............-........... <br /> ....._.. <br /> 50..PPm (5 min, m'`..P..e )....._......... <br /> Teaae[hvl Lead 075 m /m3 .075 me/m3 <br /> '.ill of rhe above are compounds that may be encountered dututg excavation. Conunon sense dictates when levels are such that extra <br /> pu",cn...1 Is necessary <br /> 1 <br />