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' TABLE 5-1 <br /> Potential Gasoline Contaminants and Exposure Limits <br /> ' Compound OSHA-PEL TLV-TWA TLV-STEL REL ppm Odor threshold Odor Characteristic Maximum Soil <br /> ppm ppm ppm values,ppm Concentration to <br /> date,ppm <br /> ' Benzene 1 10 5 0.1 4.65 aromatic,sweet 37 <br /> (Cal <br /> Toluene 100 100 150 100# 1.74 sweet,pungent 350 <br /> Xylene 100 100 150 1 100# 0.27 aromatic,sweet 500 <br /> PEL -OSHA Permissible Exposure Limit. <br /> TLV -ACGIH Threshold Limit Values. <br /> ' TWA -Time Weighted Average. <br /> STEL -Short Tenn Exposure Limit. <br /> REL -NIOSH Recommended Exposure Limit. <br /> t Ca -Suspected carcinogen, 1988-89 ACGIH TLV. <br /> 4 -60 minute ceiling, 10 hour TWA,200 ppm 10 minute ceiling. <br /> 1 <br /> t <br /> 1 <br />