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ATTACHMENT 3 ` t <br /> HUMAN HEALTH SCREENING.EVALUATION <br /> POMBO PROPERTY <br /> 1755 WEST 11TH STREET,TRACY,CALIFORNIA <br /> PROJECT#7243.001 <br /> MAXIMUM CONC;GROUNDWATER NOT POTABLE <br /> PHYSICOCHEMICAL PROPERTIES <br /> Log Octanol Organic <br /> Water Henry's Law Henry's Law Aqueous Carbon Molecular <br /> Chemical Partition Diffusivity inAir(Di) Partition Weight Vapor VOC? Permeability Constant Constant(13) Constant(HI) Solubility(S) Absorption <br /> Coefficient(Iog y(S) Pressure(VP) <br /> Coefficient (MW) (KP) Fractions Soil <br /> Koty) (K-) given <br /> given calculated given calculated <br /> --) (atm-rm3lmole) (unitiess) ( ) (cm,/sec) (cm=Jsec) (llk ) ( mnle) (mm H ) (cm/hr) (cm/hr) (__) <br /> Benzene 2.13 5.55E-03 2.28E-OI 1.75E+03 8.80E-02 9.80E-06 5.89E+0i 78.11 Yes 0.021 - 0,1 <br /> Eth lbenzene 3.15 8.44E-03 3.46E-01 1.61E+02 0.075 2.20E+02 106.2 9.5 Yes 0.074 0.1 <br /> Toluene 2.73 5.94E-03 2.44E-01 5.35E+02 0.078 2.57E+02 92 28.4 Yes 0.045 0.1 <br /> Xylenes,Total 3.17 5.30E-03 2.17E-01 2.00E+02 0.087 2.40E+02 106.2 7.9 Yes 0.08 0.1 <br /> Acenaphthene 3.92 1.20E-03 4.92E-02 3.88E+00 0.064 4.60E+03 154.2 2.23E-03 Yes NA 0.092 0.15 <br /> BenzoWanthracene 5.66 3.35E-06 1.37E-04 9.40E-03 0.051 - 3.98E+05 228.3 531E-07 No 0.81 0.15 <br /> Chryscne 5,66 9,46E05 3.88E-03 1.60E-03 0.025 3.98E+05 228.3 530E-09 No 1 0.81 0.15 <br /> Muoranthene 4.95 1.61E-05 6.60E-04 2.06E-0I 0.0302 - 1.07E+05 202.3 6.17E-05 No 0.36 0.15 <br /> Fluorene 4.21 6.42E-05 2.63E-03 1.90E+00 0-061 - 7.90E+03 166.2 2.35E-03 Yes NA 0.123 0.15 <br /> Naphthalene 3.30 5.00E-04 2.05E-02 3.17E+01 0:069 - 1.29E+03 128.2 0.082 Yes 0.069 0.15 <br /> Phenanthrene 4.57 3.90E-05 1.60E-03 9.98E-01 NA 0.060 2.72E+04 178.24 4.44E-04 No 0.27 0.15 <br /> ,Pyrene 5.11 L10E-05 4.51E-04 I 1.35E-01 1 0.027 - 1.05E+05 202.26 -3.09E-OS No NA 0.310 0.15 <br /> H'= H"41 <br /> Source:Cal-EPA,1994 <br /> Di= (0.001TA1.75+(I/MWi+1/MWa)A05) <br /> (Pa*((Vi)A]/3+(Va)AI/3))A2) <br /> Source:See"Di Calculation"Worksheet <br /> Kp= 10A(-2.8+0.067logKow-0.0056M W) <br /> Source:U.S.EPA,1998 <br /> t For chemicals not listed in Table A-1 of the PEA Manual,a permeability constant was calculatedbased on U.S.EPA's Dermal Exposure Assessment Guidance(1998)instead of choosing a surrogate value <br /> fmtn Table A-1 based on similar values for MW and Kow as recommended in the PEA Manual. <br /> pombo_based on UCLslphychem and abs Page 4 of 18 <br />