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n <br />SI.3ST_AI CES <br />Table 1 <br />H=ard E-Coosure Guidelines* <br />GgL OS�:�� <br />PEL <br />1988-59 g GIH <br />TLV <br />Benzene <br />10 pom ("Iti'v1 <br />10 pum (TW--'�; <br />25 pom (E_XC) <br />23 om (S7T ) <br />50. <br />Toluene <br />100 prim <br />p <br />100 pom rrvv _A.) <br />300 pm {Ce Iizi ' <br />150 pom (STF_L) <br />Xvlene <br />100 ppm <br />100 oom <br />150 opm (STEL) <br />Gasoline <br />300 Fpm (TWA, <br />300 Dom <br />500 wpm (STE <br />Etheldibrom'de <br />20 oprn k) <br />.045 opm <br />30 pom (Ceiling) <br />.13 pom (STEL) <br />30 pom (5 min. max eale" <br />Te=aethvl Lead <br />.075 mz/,n3 <br />.0`5 :^zg/m3 <br />•..A or the above are compounds that may be encountered during excavation_ Common sense dictares when Teves am such that e'���-+ <br />procecaon is necessary. <br />