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0 . 001 (atm' m3/mole ) volatilize from water into air very rapidly <br /> (Lyman et al. 1982 ) ; those with Henry' s Law constants greater <br /> than 0 . 01 ( atm' m3/mole ) are generally volatilized so rapidly <br /> that they are seldom found in gasoline-contaminated ground water. <br /> It may be observed (Figure 3 ) that tetraethyl lead (TEL ) has an — <br /> extremely low solubility and a relatively low vapor pressure. As <br /> a result, this constituent would not be expected to solubilize _ <br /> and migrate in ground water, and although its low vapor pressure <br /> would indicate slow volatilization, its Henry' s Law constant <br /> indicates that it may be more rapidly volatilized than <br /> solubilized. The fate of TEL would be expected to be long-term <br /> binding to the soil. <br /> On the basis of these properties it can be seen that associated <br /> with any ground water, soil, or free-product contamination is <br /> vapor phase contamination. The SVCA technique takes advantage of <br /> this, and through the collection and analysis of soil vapor <br /> permits a rapid, cost-effective delineation of the extent of <br /> contamination. <br /> 10 <br />