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' MTBE <br /> ' FATE AND TRANSPORT MODEL OUTPUT FOR MTBE <br /> art- - <br /> ofVADOSE ZONE MODEL OUTPUT <br /> Effective Diffusion coefficient for Lens <br /> - ---------------------------------------------- <br /> Total 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 01E-04 <br /> ' <br /> Overall EffectiveDiffusionCoefficient <br /> ------------------------------------------------ <br /> Overall diffusion path length [m 2 1 <br /> Overall effective diffusion coefficient cmA2/s] 8 80E-05 <br /> Overall effective diffusion coefficient [mA2/d] 7 61E-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 1 3 m <br /> Thickness of vadose zone 9 1 m <br /> Infiltration rate (voarcy) 7 40E-05 m/d <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 sail 5 OOE-03 g/gg <br /> Calculated pore water velocity 4 69E-04 m/d <br /> ' chemical-specific-Parameters <br /> -------------- --_--_ _---------------------- <br /> solubility 4 80E+04 mg1 <br /> Henrys Law coefficient 2 04E-02 1-1 <br /> KOC, organic carbon partition coeff 12 ml/g <br /> ' • <br /> Calculating DissolvedPhasesourceConcentration <br /> ------------------------------------------------ <br /> This chemical -is considered part of a TPH mixture <br /> Mass fraction of TPH in soil 7 52E-03 kg/k <br /> Molecular weight of TPH 1 50E+02 9/mol <br /> ' Mass fraction of chemical in soil 1 90E-08 kg/kg <br /> Molecular weight of chemical 88 g/mol <br /> Calculated mole fraction of chemical 4 30E-06 mol/mo <br /> ' Calculated effective solubility 0 21 mg/l <br /> Dissolved phase concentration calculated <br /> using equilibrium partitioning (3-phase) 0 12 mg/l <br /> Residual concentration level calculated <br /> using the calculated effective solubility <br /> (which accounts for mole fraction) 3 18E-02 mg/kg <br /> ***The lesser value of the (effective) solubility and the dissolved phase <br /> ***concentration calculated using equilibrium partitlom ng (see above) will <br /> ***be used as the maximum concentration in the unsaturated zone <br /> ' ***model source <br /> Results from above calculation <br /> (lim}ting concentration) <br /> ------------------------------------------------ <br /> ' Initial dissolved phase concentration 0 12 mg/l <br /> Residual concentration level calculated <br /> usingthe full solubility 7 39E+03 mg/kg <br /> ***Te source concentration is BELOW the residual concentration <br /> ' source Decay Terms <br /> ------------------------------------------------ <br /> source total decay term--Beta2 39E-04 <br /> source loss term--liquids only [1/day] 2 17E-04 source loss term--vapor only 1/day 2 12E-05 <br /> initial source vapor concentration kg/mA3] 2 52E-06 <br /> Diffusion path length [m] 2 1 <br /> ,average vertical thickness of the source[m] 1 3 <br /> ' ***Dispersivity limited to dispmax 1 OOE-06 <br /> ' Page 1 <br />