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Detailed Evaluation Of Air Sparging Effectiveness <br /> i <br /> Once you have completed the initial sci eening and determined that eau <br /> sparging may have the potential to be effective for the sods and <br /> petroleum product present, evaluate the CAP further to confirm that air <br /> sparging will be effective. <br /> Begin by reviewing the two major components that determine the <br /> effectiveness of air sparging. (Y) the vapor/dissolved phase partitioning of <br /> the constituents and (2) the permeability of the soils. The combined <br /> effect of these two components determines the rate at which the <br /> constituent mass will be removed (i.e., the constituent mass removal <br /> rate). This rate will decrease as air sparging operations proceed and <br /> concentrations of dissolved constituents are reduced. They also <br /> determine the placement and number of air sparge points required to <br /> address the dissolved phase plume. <br /> Many site-specific and constituent-specific parameters can be used to <br /> deteriznin.e vapor/dissolved partitioning and permeability Tliese <br /> uarameters are sun=arzed in Exhibit VII-5 The remainder of this <br /> section describes each parameter, why it is important to air sparging, <br /> I <br /> ow it c-a be deternuried. and its range for effective air spargaing <br /> Ex#iibrt iJ11-5 <br /> Key Parameters Used Tc Evaluate Vaper/Dissolved Phase Parti#ioning And <br /> Permeability Of Sail <br /> Constituent Vapor/Dissolved <br /> Phase Partitioning Ferrreabilrty of Soil <br /> Henry's law constant Intrinsic permeability <br /> Product composition and boiling point Soil structure and stratification <br /> Vapor pressure Iron concentration aissolved in groundwater <br /> Constituent concentration <br /> Solubility <br /> Factors That Contribute To Constituent Vapor/Dissolved <br /> Phase Partitioning <br /> Henry's Law Constant <br /> The most important characteristic to evaluate vapor/dissolved phase <br /> partitioning is the Henry's law constant, which quantifies the relative <br /> tendency of a dissolved constituent to transfer to the vapor phase. <br /> Henry's law states that, for ideal gases and solutions under equilibrium <br /> conditions, the ratio of the partial pressure of a constituent in the vapor <br /> r <br /> VH_8 October 29s4 <br />