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2018 ANNUAL GROUNDWATER MONITORING REPORT FORMER KEARNEY—KPF FACILITY-STOCKTON,CALIFORNIA <br /> The estimated rate of potential vertical migration was calculated using the following equation: <br /> vertical migration =(hydraulic conductivity x gradient)/effective porosity <br /> Site-specific values for these parameters were based on the values in Table 3.3-1 and the numerical model created <br /> to simulate groundwater movement between zones(Dudek&Associates 1997). <br /> 3.3.1 Shallow/Upper Intermediate Zones <br /> Using a vertical hydraulic conductivity of 3.12 feet per day, a vertical downward gradient of 0.1237 ft/ft, and an <br /> average effective porosity of 0.152, the estimated rate of potential vertical migration between the shallow and <br /> upper intermediate zones was 2.539 feet per day downward on October 30, 2018. <br /> 3.3.2 Lower Intermediate/Deep Zones <br /> Using a vertical hydraulic conductivity of 2.33 feet per day, a vertical upward gradient of 0.0303 ft/ft, and an average <br /> effective porosity of 0.142,the estimated rate of potential vertical migration between the lower intermediate and deep <br /> zones was 0.497 feet per day upward on October 30, 2018. <br /> 3.4 Changes in Water Levels <br /> Water levels in the shallow, intermediate,and deep zones in October 2018 generally decreased compared to those in <br /> May 2018. Water levels in the shallow, intermediate, and deep zones varied compared to those in October 2017 <br /> (Appendix B; Dudek 2018b). <br /> Precipitation, as measured at the Stockton Fire Station (CDEC 2018), was 8.76 inches between Q4 2017 and Q1 <br /> 2018, and 8.4 inches between Q2 and Q4 2018.Approximately 70 million gallons of water was pumped from CWS <br /> wells within 1 mile of the site between the beginning of Q4 2017 and the beginning of Q4 2018, approximately 18 <br /> million gallons was pumped during Q4 of 2017, and approximately 61 million gallons was pumped during Q2, Q3, <br /> and Q4 2018. In addition, well CWS-77, which is just to the west of the site, was not pumped after May 2016. <br /> 3.4.1 Shallow Zone <br /> Water levels decreased in all but two shallow zone wells(B-1 and KS-4) between May and October 2018. Net water <br /> level decreases ranged from 2.03 feet in well KS-8 to 3.75 feet in well KS-1. Net water levels increased by 0.90 <br /> and 0.35 feet in wells B-1 and KS-4, respectively. <br /> Water level changes varied in shallow zone wells between October 2017 and October 2018. Net water level changes <br /> between October 2017 and October 2018 ranged from a 1.59-foot decrease in well SMW-3 to a 2.29-foot increase <br /> in well KS-8. On average, water levels increased by 0.0335 feet in the shallow zone monitoring wells between <br /> October 2017 and October 2018. <br /> D U D E K 10886-1 <br /> 10 March 2019 <br />