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�l <br /> r <br /> The assumptions used in the modeling are presented in this section The contaminant <br /> concentrations and depths used in the modeling are shown below The concentration level for <br /> Location I (basement area) is an average of ten measurements for this depth range <br /> Location I Location II <br /> Contaminants Basement Area Sidewalk Area <br /> Diesel concentration concentration <br /> depth in feet in ppb depth in feet in ppb <br /> 2 to 5 ND 0 to 22 ND <br /> ' 5 to 11 12036000 22 to 24 110000 <br /> 24 to 26 2100 <br /> Ethylbenzene 0 to 5 ND 0 to 26 ND <br /> 5 to 10 9 0 <br /> Xylenes 0 to 5 ND 0 to 26 ND <br /> 5 to 10 160 <br /> Notes 1 ND - Not Detected <br /> 2 Detailed distributions of diesel, ethylbenzene, and xylenes in the soil <br /> columns are presented in Table 1, Geels et al (1994a and 1994b) <br /> Modeling with ethylbenzene and xylenes is straightforward because each of these <br /> contaminants is discrete compound Hence, physio-chemical properties may be determined <br /> from them Diesel is a mixture of C10 to C23 paraffin compounds It is not possible to <br /> determine the physio-chemical properties of a mixture, but it is possible to make such <br /> determinations for the discrete compounds that make up the mixture A common modeling <br /> approach for diesel involves using the charactensties of one specific diesel component, e g , <br /> } naphthalene, and modifying the values for the physio-chemical parameters In this model, we <br /> increased the solubility of naphthalene by a factor of 10 to approximate the behavior of the <br /> entire range of compounds which constitute the diesel mixture' <br /> 'Steve Bond, CRWQCB, personal communication, 01/26/95 <br /> i MZ/04-06-95/UST/95-0089 12 <br />