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4.4.2 Calculate the hydraulic conductivity of the uppermost aquifer <br />Field slug tests will be performed on two water table wells and one deep <br />well to provide data for the calculation of the hydraulic conductivity of <br />the uppermost aquifer. Hydraulic conductivity (K) will be determined using <br />calculations developed from the Thiem equation of steady state flow to <br />completely or partially penetrating wells in unconfined or leaky aquifers. <br />In addition, permeability, porosity, and grain size distribution analyses <br />will be performed on selected soil samples collected from the deep well <br />boring and representative of the aquifer matrices encountered. These data <br />will be used to verify slug test results and aid in the calculation of <br />groundwater flow velocity. <br />4.4.3 Calculate the groundwater flow velocity of the uppermost aquifer <br />Hydraulic gradient, porosity, and hydraulic conductivity calculations will <br />be used to estimate the groundwater flow velocity of the uppermost aquifer, <br />using the equation: <br />V K dh <br />n dl <br />(1) <br />where v is the groundwater flow velocity, dh/dl is the hydraulic gradient <br />' (change in hydraulic head per horizontal distance), and n is the effective <br />porosity of the aquifer matrix. <br />I I <br />it <br />n <br />J <br />4.5 Analyze the Potential for Historic Migration of Gas Plant Residues <br />Offsite <br />The groundwater flow velocity represents the fastest rate (ignoring <br />adsorption to soil particles) at which gas plant residues may be moving <br />through the aquifer. After calculating the groundwater flow velocity of the <br />uppermost aquifer and identifying the distribution and chemical composition <br />of the gas plant residues encountered onsite, an analysis of the potential <br />for historic migration of gas plant residues offsite will be performed <br />(taking into account such factors as the age of the residues and the rate of <br />infiltration). <br />3542a/BAV102 24 <br />