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APPENDIX C <br /> HUMAN HEALTH SCREENING EVALUATION <br /> POMBO PROPERTY <br /> 1755 WEST l ITH STREET,TRACY,CALIFORNIA <br /> PROJECT 0650 <br /> DIFFUSIVITY IN AIR(Di)-GUIDELINE FOR PREDICTIVE BASELINE EMISSIONS ESTIMATION PROCEDURES FOR SUPERFUND SITES;EPA, 1992 <br /> ChemicalMWi #Carbons #Hydrogens #Oxygens #Nitrogens #Chlorines #Aromatic Rings #heterocyclic Vi Di <br /> mole (em'/male) (cm I/sec) <br /> Phenanthrene 178.24 14 10 0 0 0 3 0 190.20 0.060 <br /> Di= (OOOITA775e(11MWi+11MWa)A05) <br /> (faba[(Vf) U3+(Va)AI/3)]A2) <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 E�K <br /> Temperature: T 298 MolecularWei tofAir MWa 28.8 Absolute Pressure Pab 1 aMolecular Diffusion Volume <br /> ofAir Va 20.1 <br /> pombo/Di Calculation Page 5 of 18 <br />