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TABLE 1 <br /> CHEMICAL EXPOSURE LIMITS <br /> CONTAMINANT (PEL) (IDLH) SOURCE/QUANTITY ROUTE SYMPTOMS INSTRUMENTS TO <br /> MONITOR <br /> Gasoline --- --- contaminant in soil 71nh/Abs See comp= PID 10.2 probe (HNU) , <br /> to 907 ppm aromatic below FID <br /> odor <br /> Benzene 1ppm Carc. --- Contaminant in soil 0 Inh/Abs Irrit. eyes, PID 10.2 probe (NU) <br /> to 2 .8 ppm aromatic nos. resp. colorimetric ind. <br /> odor Sys. , nausea Tube see benzene <br /> protocol FID <br /> Toluene 100ppm 2000 ppm Contaminant in soil 0 Inh/Abs Ftg. , weak, PTD 10.2 probe (HNU) , <br /> to 46 ppm aromatic dizzy headache FID <br /> odor <br /> Xylene 100 ppm 1000 ppm Contaminant in soil 0 Inh/Abs Dizz, excit. , PID 10. 2 probe (HNU) , <br /> to 122 ppm aromatic incoher. FID <br /> odor <br /> Ethylbenzene 100 ppm 2000 ppm Contaminant in soil 0 Inh/Abs Irrit. eyes PID 10.2 probe (HNU) , <br /> to 24 ppm aromatic muc. memb. , FID <br /> order head derm. , <br /> Marc. , coma <br /> i <br /> 10 <br />