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Z <br /> rStoranviry <br /> Storativity is the volume of air a soil zone releases from, or takes into, storage per unit surface <br /> area of the zone per unit change in pressure <br /> Test Arra _ <br /> A test array is comprised of one vapor extraction well and a number of observation wells used <br /> for vacuum monitonng The number of test arrays depends on the availability of existing <br /> monitoring wells that are suitably spaced and constructed (extraction and observation weIIs with <br /> similar screened casing intervals) <br /> Transient Flow <br /> Transient flow is the early-time flow penod that precedes the attainment of steady-state <br /> conditions Dunng this flow period, the vacuum response observed at a given distance changes <br /> ias a function of elapsed time. <br /> f Transmissibility <br /> Soil transmissibility to air, or the ability of the vadose zone to transmit air to the extraction well, <br /> is mathematically defined as the product of the permeability (k) of the vadose zone and its <br /> thickness (h) divided by the average hydrocarbon-saturated air viscosity (u). The soil <br /> transmissibility is used to model subsurface air flow since estimates of the air viscosity and <br /> vadose zone flow thickness are not always readily available. <br /> Transmissivity <br /> Transmiss vity is defined as the product of the vadose zone thickness (h) by the conductivity of <br /> the vadose zone (K) <br /> Vadose Zone <br />' The vadose zone or unsaturated zone, is the section of soil above the ground water table through <br />' which air flow is talang place. <br /> 1 <br /> A-2 <br />