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_ <br /> E1.4 - <br /> r <br /> PRELINRNARv IiYDROGEOLOGIC ASSESSMENT REPORT <br /> S4rrl'F 5trect,Banta,California <br /> IDe.ta Project No.40.88481 <br /> �y Page 8 <br /> r <br /> 13 <br /> The depth to the ground water measured on May 24, 1989,ranged from 11.94 to 11.54 feet below grade. <br /> The ground water contour map (Figure 7) indicates ground water flow to be in an eastward direction at <br /> a gradient of about 0.004 foot/foot To determine the hydraulic condu-.tivity of the water bearing sediment <br /> .•:• at the site, a slug test was performed in each monitoring well. The data was evaluated using methods <br /> +'s presented by Bower and Rice1976. <br /> ( ) The results of the slug tests are summarized in Table 6. Hydraulic <br /> conductivity values ran"ed from 3.71 feet/day (MW-1) to 5.52 feet/day (IyIW_3). The average K value <br /> for :he formation is 5.I8 feet/day. The average ground water velocity at the site is 0.068 feet/day, based <br /> on the average K value (5.18 feet/day),and an estimated porosity of 30 percent <br /> r <br /> f <br /> The average velocity of 0.068 feet/day was derived from the following equation: f <br /> V KI <br /> t n f <br /> Where <br /> V= Average linear.velocity. <br /> K; Hydraulic conductivity. <br /> l = Hydraulic gradient <br /> n = Effective porosity. <br /> i <br /> At the site: V; L5.18 feet/dao) (0004 Foot feet <br /> ��. 0.30 <br /> V= 0.068 feet/day = 25.2 feetlyear <br /> t <br /> NOTES: <br /> Estimated. <br /> i <br /> E K-Averaged. <br /> �i <br /> f <br /> (o The average linear velocity is expected to periodically shift with hydraulic gradient changes related to <br /> seasonal ground water level fluctuations. <br /> iwE <br /> Er <br /> t <br /> f , <br /> t - <br />