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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 /> (Ca) <br /> Toluene 100 100 150 10011 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 Term Exposure Limit. <br /> REL -NIOSH Recommended Exposure Limit. <br /> Ca -Suspected carcinogen, 198849 ACGIH TLV. <br /> # -60 minute ceiling, 10 hour TWA,200 ppm 10 minute ceiling. <br /> 1 <br />