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APPENDIX C <br /> HUMAN HEALTH SCREENING EVALUATION <br /> POMBO PROPERTY <br /> 1755 WEST 11TH STREET,TRACY,CALIFORNIA <br /> PROJECT#5650 <br /> EFFECTIVE DIFFUSION COEFFICIENT IN SOIL <br /> Chemical Diffusivity in Air Effective <br /> (Di) Diffusivity(Dei) <br /> (cm'/sec) (cm'/sec) <br /> Ethylbenzene 0.075 6.0E-03 <br /> Toluene 0.078 6.2E-03 <br /> Xylenes,Total 0.087 7.0E-03 <br /> Acenaphthene 0.064 5.1E-03 <br /> Benzo(a)anthracene 0.051 4.1E-03 <br /> Chrysene 0.025 2.0E-03 <br /> Fluoranthene 0.0302 2.4E-03 <br /> Fluorene 0.061 4.9E-03 <br /> Naphthalene 0.069 5.5E-03 <br /> Phenanthrene 0.06 4.8E-03 <br /> pyrene 0.027 2.2E-03 <br /> D6 =effective diffusivity of compound,cm'/sec <br /> =D,(P,3e3/pie) <br /> Parameter Symbol <br /> Air Filled Soil Porosity Pa <br /> Total Soil Porosity Pt <br /> pombo\Dei Page 7 of 18 <br />