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section below). The solubility constants compare closely but the SESOIL chemical file value <br /> for Ethylbenzene's Henry's constant'does not agree by three orders of magnitude with the <br /> t�3 value reported in reference no. 1 (9,0079 m3-atm/mole) or reference no. 5 (0.0087 m3- <br /> atm/mole). '�Ethylbenzene is assigned a Henry's constant of 0.0079 m3-atm/mole because it is <br /> the more conservative value. All four contaminants of concern are aromatic non-halogenated. <br /> volatile organics. <br /> The organic carbon adsorption coefficients for benzene, toluene, and ethylbenzene provided <br /> with the SESOIL software package.are more conservative than the similar values°reported in <br /> references no. 2 and reference no. 5:.(for benzene). The SESOIL recommended varies are <br /> approximately one-half to one-third of the reference no. 2 values. The more conservative <br /> SESOIL recommended values are specified. <br /> Xylenes are composed of three isomers with similar properties. According to reference'no. 4, <br /> all three isomers may occur in approximately equal amounts in a gasoline when sold. <br /> Therefore, average chemical properties.were calculated and.input to SESOIL <br /> Water Solubility <br /> 175 mg/1 - 1,2-Xylene (page 505 of ref. 4) <br /> i 146 mg/1 - 1,3-Xylene (page 516 of ref. 4) <br /> 156 mg/1 - 1,4-Xylene (page 526 of ref. 4) <br /> average = 159 mg/1 <br /> Henry's Law Constant „ <br /> fi*+ 5.1 X' 10-3 atm-m3lmole - 1,2-Xylene (page 505 of ref. 4) <br /> 7.7 x. 10-3 atm-m3/mole - 1,3-Xylene (page 516 of ref. 4) <br /> 7.7 x 10-3 atm-m3/mole - 1,4-Xylene (page 526 of ref. 4) <br /> average = 6.8 x 10-3 atm-m3/mole <br /> Molecular Weight <br /> 106.16 grams/mole - 1,2-Xylene (page 505 of ref. 4) <br /> 106.17 grams/mole - 1,3-Xylene (page 516 of ref. 4) <br /> 106.17 grams/mole - 1,4-Xylene (page 526 of ref. 4) <br /> average = 106.17 grams/mole <br /> w:194368Veportsltcsoil.doc 9 <br /> f PUTH <br />