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'.allot the above are <br />Table <br />Hazard E:mosure <br />Guidelines* <br />SL; BST_U� CES <br />CAI.. OSPLA, <br />198e-89 A CGIH <br />PEL <br />TLV I <br />Benzene <br />10 <br />ppm <br />10 <br />pom ('7TA) <br />25 <br />ppm (E_XC) <br />25 <br />p pm (STET) <br />34 ppm-! <br />:Iin�L <br />I <br />Toluene <br />100 <br />ppm (7X A) <br />100 <br />i <br />ppm (TWA) <br />300 <br />ppm (Ce; lin l <br />130 <br />porn (STEL) <br />Xvlene <br />100 <br />ppm (TZ-_-.) <br />100 <br />pom "A) <br />150 <br />pom (STEL, <br />I <br />Gasoline <br />300 <br />ppm A) <br />300 <br />ppm <br />500 <br />ppm STEL) <br />Etheldibromide <br />20 <br />pm A) <br />.043 <br />ppm CI Y"A .) <br />30 ppm <br />Ceiling <br />13 <br />pom (STEL) <br />30 ppm (3 min. max peak) <br />Tetraethyl Lead <br />073 <br />mm3mg <br />/m3 <br />i <br />compounds chat may be eacountezed during excavation. Common sense dictates when to^.es aze such that <br />protection is uecessar��. <br />