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APPENDIX A-7 <br /> HUMAN HEALTH SCREENING EVALUATION <br /> SURLAND HOMES.PROPERTY <br /> TRACY,CALIFORNIA <br /> PROJECT 6447.007 <br /> FINAL <br /> EFFECTIVE DIFFUSION COEFFICIENT IN SOIL <br /> Chemical <br /> Diffusivity in Air Effective <br /> (Di) Diffusivity(Dei) <br /> (cm2/sec) (cm2/sec) <br /> Eth (benzene 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 /> Chrysene 0.025 2.0E-03 <br /> Fluoranthene 0.0302 2.4E-03 <br /> Fluorene 0.061 4.9E-03 <br /> Phenanthrene 0.06 4.8E-03 <br /> jPyrene 0.027 2.2E-03 <br /> D,; =effective diffusivity of compound,cm'-/sec <br /> =D.(p.1.33/p,2) <br /> Parameter Symbol Value Units <br /> Air Filled Soil Porosity Pa 0.28 unitless <br /> Total Soil Porosity Pt 0.43 unitless <br /> i:\project\6000s\6447\6447.007Uva stand alone doc\pea risk for surland.xls Page 7 of 18 <br />