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APPENDIX A-3 <br /> HUMAN HEALTH SCREENING EVALUATION <br /> SURLAND HOMES PROPERTY <br /> TRACY,CALIFORNIA <br /> PROJECT 6447.007 <br /> FINAL <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 (cm 3/mole) (cm'/sec) <br /> Phenanthrene 178.24 14 10 0 0 0 3- 0 190.20 0.060 <br /> Di= (O.00IT^1.75•(I/MWi+ I/MWa)M.51 <br /> (Pab•[(Vi)^I/3+(Va)^1/3))^2) <br /> Where: <br /> C atom 16.5 <br /> H atom 1.98 <br /> 0 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 eK <br /> Molecular Weight of Air MWa 28.8 mole <br /> Absolute Pressure Pab 1 atmospheres <br /> Molecular Diffusion Volume <br /> of Air Va 20.1 cm'/mole <br /> i:tpmjm%000s\6447\6447.0074na stand done dodpea risk for nulmmd.xls Page 3 or I x <br />