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_ <br /> _a <br /> C <br /> E'er <br /> The predicted transmissivity and hydraulic conductivity of the shallow unconfined aquifer in the vicinity of the <br /> subject site are based on the averages of the values obtained from the drawdown data and the recovery data from <br /> j the production well (RW-1): <br /> Transmissivity (T) = 91.6 Md/ft-) + 156.2 d ft. = 1739 gpd/ft. 170 gpd/ft. <br /> 2 <br /> - Hydraulic Conductivity(K) J73.9 d ft. = 10.87 gpd/ft.t 11 vpd/ft.2 <br /> 16 ft. <br /> Hydraulic Gradient (i) <br /> (3) i = H <br /> L <br /> where H = Differential Hydraulic Head (ft.) = 1.0 ft. <br /> L = Distance Along Flow Path (ft.) = 41.8 ft. <br /> (values for H and L were obtained from Figure 2 of the text). <br /> Therefore: i = 0.0239 ft./ft. 0.024 ft./ft. <br /> Down Gradient Radius of Capture Zone (X) <br /> ..` J (5) X = Q (Rrf.M,•m da.:Evade]—d T-.&1986) <br /> 2n-Ti <br /> 'S <br /> where Q = Pumping Rate (gpd) <br /> T = Transmissivity (gpd/ft.) <br /> - i = Hydraulic Gradient <br /> Therefore equation (5) becomes: <br /> X = _ 5760 end = 219.76 ft. 220 ft. <br /> 2(3.14)(173.9 gpd%ft.)(0.024) <br /> Width of Capture Zone(Y) <br /> (6) Y = + _Q_(P <br /> (Rryroldr m dWrlmvdc[aM Tuny 1986) <br /> 2 Ti <br /> x Variables as stated for equation (5) above: <br /> 1 <br /> Therefore equation (6)becomes: <br /> Y ± = 5760 end = 690.05 ft. y 690 ft. <br /> ►� 2(1739 gpd/ft)(0.024) <br /> DuPont Environmental Services c-2 <br />