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L <br /> Correlation of soil vapor hydrocarbon concentrations with soil <br /> and ground-water hydrocarbon concentration is highly site- <br /> specific. Correlation with ground-water concentrations may be <br /> related to the Henry' s Law constants. The Henry ' s Law constant ` <br /> represents the equilibrium relationship between vapor phase and <br /> dissolved phase concentration. That is at equilibrium the ratio <br /> between soil vapor concentration and the immediately underlying <br /> ground water is equal to the Henry ' s Law constant. For benzene <br /> and toluene the Henry' s Law constants are 5 . 5 x 10-3 atm.M3/mole <br /> and 6. 6 x 10-3 atm.m3/moie, respectively. Expressed in terms of <br /> ppm and mg/L these Henry ' s Law constants predict an approximate <br /> relationship of 1 ppm: 0 . 014 mg/L. <br /> 141014� <br /> I <br /> V Pf <br /> t//-7 S� <br /> Uz <br /> Vs <br /> 8 <br />