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APPENDIX A <br /> GLOSSARY OF TERMS AND ABBREVIATIONS <br /> Canductivity <br /> SoiI conductivity is defined as a soil parameter proportional to the soil permeability and the <br /> properties of the fluid flowing through the porous medium. <br /> D v'5 jAw <br />' Darcy's law describes the flow mechanism of a fluid in a porous medium, it gives a mathematical <br /> relationship between the fluid velocity and the hydraulic gradient under which the fluid is <br /> flowing. <br /> Effective Radius of Influence <br />' The effective radius of influence is defined as the distance from an air extraction well at which <br /> the calculated pressure drawdown is 0 1 in. H2O. During the transient period, the radius of <br /> influence is a function of extraction time, the soil hydraulic parameters, and the location of <br />' recharge boundaries. <br /> Observation Well <br /> An observation well is a non-extracting well used to observe the vacuum response at a given <br /> distance from the test well. The observation well ideally has a screened casing interval similar <br /> to the air extraction well. <br />' Permeability <br /> In Darcy's law, the permeability (k) is a constant of proportionality that relates the flow velocity <br />' and the pressure gradient. In single-phase flow, the permeability is only a function of the porous <br /> medium, and has dimensions of length squared. <br /> Steady-State FIow <br /> Steady-state flow conditions prevail after a period of air extraction. At steady state, the vacuum <br /> 1 impressed at a given distance from an air extraction well does not change as a function of time. <br /> The closer an observation well is to an air extraction well the less time is required to reach <br /> steady-state flow <br /> 1 <br /> + A-1 <br />