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Theoretical estimates were generated using field data for the radius of influence soil <br /> permeability, and well vacuum to determine ISVE feasibility. To estimate the effective <br /> radius of influence, well and monitoring point vacuum data were normalized and plot- <br /> ted'on a semi-log graph following the procedure described in Buscheck et al., 1991. A <br /> begtfit was obtained using linear regression techniques. Vacuum influence is assumed <br /> to be effective within a radial distance from the extraction well where a minimum of <br /> 1.0percent of total vacuum is achieved. <br /> Theoretical values for flow rate versus vacuum were generated from a PACIFIC in- <br /> hous'e computer model which approximates radial flow through soil. From these values, <br /> predictions can be made on ISVE system performance at flow rates which exceed those <br /> during the test. Soil permeability was also estimated from the theoretical data. <br /> Computer modeling results are included in this attachment and have been summarized <br /> below. <br /> Estimated Theoretical <br /> Effective Radius Estimated Flow Rate at <br /> Extraction of Influence Permeability at 100 inches H2O <br /> Point (feet) (Darcies)* (scfm) <br /> ' Probe 1 14 2 2.4 <br /> scfm = Standard cubic feet per minute <br /> * One Darcy = 1 x 10-8 cm2(approximately) <br /> t , <br /> w A. <br /> G <br /> i <br /> ,G <br /> 31001( #RAP A-.2 March 18, 1993 <br /> '� <br />