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SAFEWAY MEAT PACKING FACILITY, STOCKTON, CALIFORNIA TIER II RISK BASED CORRECTIVE ACTION FEBRUARY 26, 1996 PAGE 2 - 1 2.0 CHEMICALS OF INTEREST AND TOXICITY CRITERION This section reviews the analytical chemistry results that have been used to identify the chemicals of interest for which SSTLs have been developed In addition, this section provides information on the composition of diesel and discusses total petroleum hydrocarbon as diesel (TPH-D) results for the site soil and groundwater samples 2.1 Chemicals of Interest and Toxicity Factors Tables 1 and 2 summarize the analytical results for soil and groundwater, respectively The soil samples results reported in Table 1 are for the samples that were taken either after the tank field excavation or are within a portion of the site that was not excavated or was unlikely to have been excavated The groundwater samples results are from the latest monitoring period and for hydropunch/grab samples recently taken by Krazen (1995) Each chemical detected in at least one sample has been identified as a chemical of interest (COI) These chemicals are benzene, toluene, xylenes, ethylbenzene, 1,2,4-trnmethylbenzene, anthracene, phenanthrene, and pyrene Among the COIs, only benzene is classified as a carcinogen USEPA categorizes benzene as a known human or "Class A" carcinogen Under current theory of carcmogenesns, any exposure to a carcinogen increases the lifetime risk of developing a cancer The cancer slope factor (SF) is a used to characterize the potency of a carcinogen as a result of inhalation and oral exposures The slope factor is in units of "risk per mg of chemical per kilogram body weight per day" [(mg/kg-day)'`] The incremental increase in cancer rate is estimated by the SF times the estimated lifetime average daily dose of a chemical (un units of mg/kg-day) Both the USEPA (1995b) and the California Office of Environmental Health Hazard Assessment (OEHHA, 1994) 0131CDJ1