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Am '�"-ZZ <br /> M. <br /> R <br /> vacuum applied to the vapor extraction well. To REFERENCES <br /> create a graphical representation of the <br /> y theoretical data, a set of values of 'q" were Aravin and Numerov, Theory of Fluid Flow in <br /> determined while holding "PO constant and an Undeformable Po.-ous Media," 1965. <br /> varying IC Three sets of values were determined <br /> by using three values of'Pv' and varying K for <br /> each value. Three lines of constant pressure(iso- <br /> vac) were plotted on a log graph of 'q" versus <br /> "1C" <br /> ACCURACY OF THE T1IEOltrIJCkL METIlOD <br /> I To check the accuracy of the theoretical method, <br /> real data was plotted on a figure generated from <br /> t ' equation 3. The correlation between theoretical <br /> and empirical data is poor; however, there is a <br /> s s correlation between the inferred real data iso-vac <br /> I slopes and the theoretical iso-vac slopes. This <br /> correlaGnn was used to develop a tool to predict <br /> the required vacuum to produce a desired flow <br /> 4 rate of air through the soil. Mr <br /> t SOIL VENTING DESIGN TOOL <br /> 4 From Equation 3,three iso-vacs at vacuums of 2, <br /> 4, and 8 inches of mercury were adjusted to <br /> f , correlate to the real data derived from current <br /> soil venting projects. 'rhe slopes of each iso-vac <br /> was maintained waile it was adjusted vertically to <br /> match the real data. The adjusted plot of rated <br /> j flow rate versus soil type or intrinsic permeability <br /> with plotted field data is presented in Figure 1. <br /> ' DISCUSSION <br /> I� <br /> The design tool (Figure 2) employed two soil <br /> s types due to the fact that soil venting clay is not <br /> E recommended and the desired flow rate in course <br /> sands can generally be achieved with a vacuum <br /> I of 2 inches of mercury or less. A maximum iso- <br /> maw <br /> vac of 8 inches of mercury was used to develop <br /> the design tool. For most soil venting projects <br /> it is not necessary to exceed 10 inches of <br /> mercury. <br /> F:1 <br /> The design tool was developed to help other <br /> •. Delta offices in predicting the vacuum required <br /> c, to induce a flow rate through a certain soil type. <br /> Figure 2 was also developed to create an <br /> i information and communication catalyst <br /> r" <br /> throughout Delta offices to determine how our <br /> current systems compare to theoretical values and <br /> to create an improved design tool. <br />