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SAFEWAY MEAT PACKING FACILITY, STOCKTON, CALIFORNIA <br /> TIER H RisK BASED CORRECTIVE ACTION <br /> FEBRUARY 26, 1996 <br /> PAGE 2 - 4 <br /> naphthalene and 2-methylnapthalene) in virgin diesel fuel tend to be much higher than the larger, <br /> carcinogenic PAHs because of differences in boiling points and their concentrations in crude oil <br /> For example, 2-methylnaphthalene boils at approximately 241 to 242 °C and is a mayor <br /> constituent of virgin fuel, its mass concentration can range from of 0 1 to 8% of diesel (IARC <br /> 1989 and Gnest et al 1985) In contrast benzo(a)pyrene, a suspected carcinogen, boils at 311°C <br /> and is only found at mass concentrations of 0 0006% (IARC 1989) BTEX compounds boil at <br /> concentrations below the distillation range of diesel (i e , from 80°C for benzene to 144 °C for <br /> xylenes (Verscheruen 1983}, and are found at concentrations of 2 to 20 parts per million (ppm)for <br /> benzene and 1,700 to 3,350 ppm for xylenes (Griest, et al 1985) <br /> When a diesel source is known or suspected, the compounds detected as TPH-D that are not <br /> quantified as either BTEX or PA-Hs are likely to be either alkanes and/or organic acids and <br /> degradation products of petroleum (Marks 1995) Straight-chain alkanes (and other aliphatic <br /> petroleum chemicals) in a soil or groundwater do not pose significant threats to either human <br /> health or water quality because they have a low order of human toxicity Further, they will <br /> biodegrade naturally over time Based on the analytical laboratories evaluation of the <br /> chromatographic patterns of TPH-D at the Stockton site and this review of the composition of <br /> virgin diesel fuel, TPH-D has not been identified as a COI for this site <br /> 0131CDJ1 <br />