Laserfiche WebLink
M M M as w ow * M r go we M w #a Lip M so in <br /> 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''/mole cm2/sec) <br /> Phenanthrene 178.24 14 10 0 0 0 3 0 190.20 0.060 <br /> Di= (0.00lT^I.75'(I/MWi+I/MWW0.5) • <br /> (Pab a[(Virl/3+(Varl/3)]A 2) . <br /> Where: <br /> C atom 16.5 <br /> H atom 1.98 <br /> O atom 5.48 <br /> N atom 5.69 <br /> CI 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 g1mole <br /> Absolute Pressure Pab I atmospheres . <br /> Molecular Diffusion Volume <br /> of Air Va 20.1 cm'/mole <br /> is\project\6000s\6447\6447.0074"stand alone doc\pea risk for surland.xls Page 3.f 18 <br />