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' xylenes <br />' FATE AND TRANSPORT MODEL OUTPUT FOR xylenes <br /> *art Of VADOSE ZONE MODEL OUTPUT <br />' -Effective Diffusion Coefficient for Vadose zone <br /> ---------------------------------------- <br /> Total thickness of subunit [cm] 1 60E+02 <br /> A,r-filled porosity [-] 9 22E-02 <br /> ' water-filled porosity [-1 0 16 <br /> Total porosity [-] 0 25 <br /> Effective diff coeff for subunit (CMA2/s] 4 10E-04 <br /> ' Effective„ <br /> DiffusioncoefficientforLens <br /> ---------- ------------------------------------- <br /> Tota} thickness of subunit [cm] 1 80E+02 <br /> Air-filled porosity [-] 3 84E-02 <br /> water-filled porosity [-] 0 36 <br /> Total porosity [-] 0 40 <br /> ' Effective diff coeff for subunit (CMA2/s] 1 4SE-05 <br /> overall Effective Diffusion coefficient <br /> --------------------------------------------- <br /> - <br /> overall diffusion path length [m - 3 8 <br /> overall effective diffusion coefficient cmA2/s] 2 70E-05 <br /> ' overall effective diffusion coefficient [mA2/d] 2 33E-04 <br /> Data Summary and initial calculations <br /> ' unsaturated zone <br /> ------------------------------------------------ <br /> Distance from ground surface to source 1 5 m <br /> Thickness of source 4 6 m <br /> ' Thickness of vadose zone 7940E-D5 m/d <br /> Infiltration rate (vDarcy) <br /> Porosity in vadose zone 0 25 -� <br /> Moisture content in vadose zone 0 16 <br /> Soil bulk density 1 7 g/cm3 <br /> ' Fraction organic carbon in soil 5 OOE-03 g/gg <br /> calculated pore water velocity 4 69E-04 m/d <br /> chemical-specific Parameters <br /> ------------------------------------------------ <br /> solubility 1 98E+02 mg/l <br /> Henrys Law coefficient 0 29 1-1 <br /> KOC, organic carbon partition coeff 2 40E+02 ml/g <br /> Calculating Dissolved Phase Source concentration <br /> ^ <br /> This chemical is considered partof a TPH mixture <br /> ' mass fraction of TPH in soil 750E+02 /o <br /> molecular <br /> Molecular weight of TPH <br /> Mass fraction of chemical in soil 6 90E-05 /k <br /> Molecular weight of chemical 1 06E+02 gl <br /> Calculated mole fraction of chemical 1 30E-02 mo /mo <br /> Calculated effective solubility 2 6 mg/l <br /> Dissolved phase concentration calculated <br /> using equilibrium partitioning (3-phase) 53 mg/l <br /> ' Residual concentration level calculated <br /> using the calculated effective solubility <br /> (which accounts for male fraction) 3 4 mg/kg <br /> ' ***The lesser value of the (effective) solubility and the dissolved phase <br /> ***concentration calculated using equilibrium partitioning (see above) will <br /> ***be used as the maximum concentration in the unsaturated zone <br /> ***mode} source <br /> t Results-------- ----------------------------------------fromabove-calculation <br /> - --------------- <br /> (}uniting concentration) <br /> initial dissolved phase concentration 2 6 mg/l <br /> ' Residual concentration level calculated <br /> usin the full solubility 2 59E+02 mg/kg <br /> ***The source concentration 15 ABOVE the residual concentration <br /> Source-Decay Terms------ ----------------------------------------- <br /> source total decay term--seta 4 37E-07 <br /> Source loss term--liquids only [1/day] 3 52E-07 <br /> source loss term--vapor only LI/day 8 47E-08 <br /> initial source vapor concentration }kg/mA3] 7 44E-04 <br /> Page 1 <br />