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ATTACHMENT 3 <br /> HUMAN HEALTH SCREENING EVALUATION <br /> • BURNSPROPERTY <br /> 1887 PROPERTY,TRACY,CALIFORNIA <br /> PROJECT#7243.002 <br /> EFFECTIVE DIFFUSION COEFFICIENT IN SOIL <br /> Diffusivity in Air Effective <br /> Chemical (Di) Diffusivity(Dei) <br /> (CM2/sec) (CM2/sec) <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 /> Toluene 0.078 6.2E-03 <br /> Xylene 0.087 7.0E-03 <br /> • Del =effective diffusivity of compound,CM2/sec <br /> Di l(/Pa 3.33 2 <br /> t ) <br /> Parameter Symbol <br /> Air Filled Soil Porosity Pa <br /> Total Soil Porosity Pt <br /> • <br /> burns_pea update_copy\Dei Page 7 of 18 <br />