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r t r t t r r t r <br /> TABLE 5-2 <br /> SLOPE FACTORS AND REFERENCE DOSES <br /> FOR CHEMICALS OF CONCERN <br /> YELLOW FREIGHT, STOCKTON <br /> Chemical Exposure Subchronic' Chronic Reference Slope Factor EPA Weight <br /> Route Reference Dose Dose RfD SF of Evidence <br /> RfD (mg/kg-day) (mg/kg-day) (mg/kg-day)- Category ! <br /> Benzene Inhalation NA NA 0.029" A l <br /> Ingestion NA NA 0.029" <br /> Dermal' NA NA 0.029" <br /> Ethylbenzene Inhalation 0.29" 0.29" NA NA <br /> Ingestion 1.0" 0.1" NA <br /> Dermal' 1.0" 0.1" NA <br /> Toluene Inhalation 0.114b 0.1146 NA NA <br /> Ingestion 2.0" 0.2" NA <br /> Dermal' 2.0" 0.2" NA <br /> Xylene Inhalation 0.2` 0.2° NA NA <br /> Ingestion 4.0" 2.0" NA <br /> Dermal' 4.0" 2.0" NA <br /> Toxicity value from IRIS 1995 <br /> b Toxicity value from HEAST 1994 <br /> Toxicity value from DTSC 1995 <br /> ' Subchronic RfDs were used with the child resident scenarios. <br /> 2 Dermal toxicity values were taken from ingestion toxicity values. <br /> NA = Not Available or not determined <br /> S:\LDC\YELLO.RPT May 4, 1995 <br />