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Table 1 <br /> Hazard E_�osure Guidelines* <br /> .........._—. ........................................._.�_..............__.......-............_.._.._......---......_...._.__.._................... <br /> SUBSTANCES CAL OSHA 1988-89 ACGIH <br /> PEL TLV <br /> Bene <br /> ......... ---- . — —.... 10.P..P..m... .._.._....---...........?......................._IO.PP�t?_.�T <br /> ............__......._............._._........_....__._...-....__...._—._.._._25..P..P.a'... C�..--.._.....................................?�..PP._n'CST ).._.......__...._. <br /> ...... -------....................... . . . ---- ....'...PP .E =.._ _. <br /> Toluene ...... -.._..._l00 F.Pm... P`Z._._._...__.......i._....................19 PPn'_. `,'�....__...._....... <br /> --_....._300..PPM--"(Cegin - -...-................_..._150..PPn'...�5 ._......... <br /> ........ <br /> Xplene.............._................---..-.........—......-100_.eP.ttt... '�_...._..........—......._......__..._100..P..P..Tn... A�....................... <br /> ...__..1.50..PPm...LSTEL)...................... <br /> Gasoline ....._._.._ ..-.PPm- e'� -- .._...i_._......_.__300.P.P.ttt...L1 Z�I._............. <br /> ........._..........__._._._i.._................_500.PP.m....ST.._�....................... <br /> Etheldibromide20.P.P..R'...�...A�......--...... _..... P.P..m... A�.._....._....... <br /> —_........- -.30_PP..m (Ceilin ....... - - _................_:13..PLm...�STEL�.... <br /> _....... <br /> ......... <br /> - -._......_......_50_PPm �5_min_max..Peak�........-- <br /> ......................—_............._. - ....................-........................._..._..........-....................... <br /> Tetraethyl Lead .075 ms .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 /> 4 <br />