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1. TABLE 5-1 <br /> Potential Petroleum Contaminants and Exposure Limits <br /> 1 Compound OSHA-PEL TLV-TWA TLV-STEL REL ppm Odor threshold Odor Characteristic <br /> Ppm ppm plan values,ppm <br /> Benzene 1 10 5 0.1 4.65 aromatic,sweet <br /> 1 (Cal <br /> Toluene 100 100 150 100# 1.74 sweet,pungent <br /> 1 Xylene 100 100 150 1009 0.27 aromatic,sweet <br /> PEL -OSHA Personnel Exposure Limit. <br /> TLV -ACGIH Threshold Limit Values, <br /> 1 TWA -Time Weighted Average. <br /> STEL -Short Term Exposure Limit. <br /> REL -NIOSH Recommended Exposure Limit. <br /> Ca -Suspected carcinogen,1988-89 ACGIH TLV. <br /> # -60 minute ailing, 10 hour TWA,200 ppm 10 minute ceiling. <br /> 1 . <br /> 1 <br /> i <br /> N <br /> i <br /> 1 <br /> i <br /> 1 <br /> 1 <br /> 1 <br /> 1� <br /> 1 <br /> i <br />