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ATTACHMENT <br /> HUMAN HEALTH SCREENING EVALUATION <br /> BURNSPROPERTY <br /> 1887 PROPERTY,TRACY,CALIFORNIA <br /> PROJECT#7243.002 <br /> DIFFUSIVITY IN AIR(Di)-GUIDELINE FOR PREDICTIVE BASELINE EMISSIONS ESTIMATION PROCEDURES FOR SUPERFUND SITES;EPA,1992 <br /> Chemical MWi #Carbons #Hydrogens #Oxygens #Nitrogens #Chlorines #Aromatic Rings #Heterocyclic Vi Di <br /> /mole) (cm3/mole) (cm2/sec) <br /> Phenanthrene 178.24 14 10 0 0 0 3 0 190.20 0.060 <br /> Di= (0.001T^1.75*(1/MWi+1/MWa)^0.5) <br /> (Pab*[(Vi)^1/3+(Va)^1/3)1^2) <br /> Where: <br /> C atom 16.5 <br /> H atom 1.98 <br /> O atom 5.48 <br /> N atom 5.69 <br /> Cl atom 19.5 <br /> Aromatic -20.2 <br /> Heterocyclic -20.2 <br /> Source: U.S.EPA, 1992 <br /> Parameter Symbol Value Units <br /> Temperature T 298 °K <br /> Molecular Weight of Air MWa 28.8 mole <br /> Absolute Pressure Pab 1 atmospheres <br /> Molecular Diffusion Volume <br /> of Air I Va 20.1 cm3/mole <br /> burns_pea update_copy/Di Calculation Page 5 of 18 <br />