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2018 ANNUAL GROUNDWATER MONITORING REPORT FORMER KEARNEY-KPF FACILITY-STOCKTON,CALIFORNIA <br /> 3.2.3 Lower Intermediate Zone <br /> The hydraulic gradient in the lower intermediate zone is based on water levels measured on October 30, 2018, <br /> in monitor wells KI-11, KI-14, and KPL-5. The hydraulic gradient was 0.00426 ft/ft (Table 7), with groundwater <br /> flowing generally toward the center of the site (Figure 5). In May 2018, the direction of groundwater flow in the <br /> lower intermediate zone was toward the center of the site and the hydraulic gradient was 0.00467 ft/ft. <br /> Aquifertesting previously conducted atthe site yielded estimates of hydraulic conductivity in the lower intermediate <br /> zone ranging from 6.34 feet per day to 20.74 feet per day. The arithmetic mean of these hydraulic conductivity <br /> estimates is 13.54 feet per day (Dudek &Associates 1997). The effective porosity of the lower intermediate zone <br /> was estimated to be 0.133, based on laboratory determinations of specific retention and total porosity (Dudek & <br /> Associates 1997). Based on the observed gradient in October 2018, an estimated hydraulic conductivity of 13.54 <br /> feet per day, and effective porosity of 0.133, the estimated average linear velocity of groundwater in the lower <br /> intermediate zone was 0.4337 feet per day(Table 7). <br /> 3.2.4 Deep Zone <br /> The hydraulic gradient in the deep zone is based on water levels measured on October 30, 2018, in monitor <br /> wells INJ-1, KD-6, and KD-1. The hydraulic gradient was 0.00089 ft/ft (Table 7), with groundwater flowing <br /> toward the east-northeast (Figure 6). Well CWS-77 was not pumping on October 30, 2018. In May 2018, the <br /> direction of groundwater flow in the deep zone was toward the east-northeast. CWS-77 was not pumping when <br /> water levels were measured in May 2018. The hydraulic gradient in May 2018 was 0.00003 ft/ft. <br /> Aquifer testing previously conducted at the site yielded an estimate of hydraulic conductivity in the deep zone of <br /> 195.55 feet per day(Dudek&Associates 1997).The effective porosity of the deep zone was estimated to be 0.15 <br /> (Dudek&Associates 1997). Based on the observed gradient in October 2018,the estimated hydraulic conductivity <br /> of 195.55 feet per day, and effective porosity of 0.15,the estimated average linear velocity of groundwater in the <br /> deep zone was 1.1603 feet per day(Table 7). <br /> 3.3 Groundwater Movement Between Zones <br /> Vertical gradients were calculated using the wells near KI-5, which was pumping at the time of water level <br /> measurements.Table 3.3-1 shows the vertical gradients as calculated for each semi-annual monitoring event in 2018. <br /> Table 3.3-1. Vertical Gradients <br /> May 2018 October 2018 <br /> Zones Compared Wells Used in Comparison (feet per foot) <br /> Shallow/Upper Intermediate KPS-5 and KPU-5 0.1253 0.1237 <br /> 1 1 <br /> Upper Intermediate/ KPU-5 and KPL-5 0.1323 0.1290 <br /> Lower Intermediate T T <br /> Lower Intermediate/Deep KPL-5 and KD-5 0.0312 0.0303 <br /> T T <br /> 1 = downward flow. <br /> T = upward flow. <br /> D U D E K 10886-1 <br /> 9 March 2019 <br />