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!. H. KLEINFELDER &ASSOCIATES <br /> yet been obtained but will be {n the near future. [Dater levels within the <br /> f monitoring well network would have to be measured after the nearby <br /> agricultural well had beep off (not pumping) for 40-96 hour period to <br /> evaluate the magnitude of any hydraulic interference Influence. <br /> The Stockton region has experienced an overdraft situation from high water <br /> usage of the area ground water. Regional potentiometraic surface <br /> elevations have declined and gradients are strongly affected by regional <br /> Pumping cone of depressions. Flow direction and gradient variations <br /> should be .expected due to this influence. <br /> An estimate of the hydraulic conductivity and porosity of Zone IV <br /> sediments described in the lithologic logs has been used along with the <br /> measured hydraulic gradient to determine a velocity range of ground water <br /> moving through the uppermost water bearing unit. Hydraulic conductivity <br /> for the unconsolidated, fine grained, poorly graded sand observed within <br /> Zone IV has been estimated from slug tests. An estimate of porosity fnr <br /> these sands would he 30 percent. <br /> Using the following Darcy mathematical relationship: <br /> ,a <br /> V = K(dh/dl) <br /> Where: <br /> V = velocity <br /> dh/dl = hydraulic gradient = 0.0073 ft/ft <br /> K = hydraulic conductivity = ranging between 3.85 ft/day <br /> to 22.25 ft/day <br /> n W effective porosity = 0.3 <br /> i <br /> j a velocity range for ground water moving through Zone IV can be <br /> f calculated. The calculation provides a range of values between 32.85 <br /> feet/yr to 197.1 feet/year. <br /> Transmissivity and storage coefficients for the uppermost water-bearinf, <br /> unit (Zone IV) have been estimated from a series of slug tests (Appendix <br /> C). <br /> 53-87-443 <br /> 13 <br />