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I I <br /> IPHASE PARTITIONING WORKSHEETS <br /> The following set of equations describes the phase partitioning equilibrium relationships of chemicals <br /> (including contaminants) in the subsurface environment <br /> Knowing the vapor phase concentration of a given contaminant C„ (from soli vapor <br /> analytical results), the concentration of that contaminant in the soil pore water can be <br /> calculated using the following relationship <br />' C„ = H' CL <br /> [Lyman, W J et al, <br />' Handbook of Chemical Property Estimation Methods <br /> American Chemical Society, 19901 <br /> Where: <br /> IC„ = vapor phase concentration [mg of contaminant/L of vapor] <br />' H' = dimensionless Henry's law constant [(mg/L)/(mg/L)], chemical specific <br /> CL = dissolved contaminant concentration in the liquid (soil pore water) phase (mg/L) <br />' TPH-Gasoline <br /> Given <br /> Cy = 0.10 mg1L (average of reported analytical results from final month of SVES operation <br /> equates to approximately 35 ppm) <br />' H' = 0 275 (average of specific Henry's Law constants for the BTEX compounds) <br />' Then. <br /> CL = C„ / H' <br /> CL = 0 010 mgL = 0 364 mg/L TPH-G In the soil pore water <br /> 0 275 <br /> Benzene <br /> Given: <br />' C,, = 0 00056 mg/L (average of reported analytical results from final month of SVES operation <br /> equates to approximately 0 175 ppm) <br /> H' = 0 232 for benzene <br /> Then <br /> CL = C„ / H' <br /> CL = 0 00056 mq/L = 0 0024 mg/L benzene in the soil pore water <br /> 0.232 <br /> I <br />