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3 Water Levels <br /> Depth to water was measured in 47 monitor wells and 1 injection well at the site on October 30, 2018, between <br /> 10:30 and 18:14 (Table 3, Water Levels) (Appendix A and Appendix B, Water Level Hydrographs). The <br /> extraction wells were operating when depth to water was measured. The injection well was not operating; it <br /> has not operated since prove-out of the retrofitted treatment system in 2002 and 2003. Depth to water was <br /> measured in accordance with the standard operating procedures outlined in the WQSAP (Dudek 2017a). <br /> California Water Service(CWS) production well CWS-77 was not pumping on October 30,2018,when water levels <br /> were measured. Production well data is listed in Table 5, California Water Service Well Production Volumes, and <br /> shown on Figure 19, Total Monthly Production Over Last 10 Years for CWS Wells in the Vicinity of the Site. <br /> Well DMW-1 is screened in both the lower intermediate zone and the deep zone. Well SPW is reportedly screened <br /> in both the upper and lower intermediate zones, but the common ion composition of water from well SPW and <br /> aquifer test data indicate that SPW derives some of its water from the deep zone.Well construction details for these <br /> wells and all others can be found in Table 6, Monitor Well Construction Data. <br /> 3.1 Water Level Elevations <br /> 3.1.1 Shallow Zone <br /> On October 30, 2018, water level elevations in the shallow zone ranged from -20.39 feet mean sea level (msl) in <br /> monitor well KPS-5 to-14.55 feet msl in well KS-8 (Table 3 and Figure 3, Shallow Zone Groundwater Elevations). <br /> 3.1.2 Intermediate Zone <br /> On October 30, 2018, water-level elevations in the intermediate zone ranged from -46.46 feet msl in monitor <br /> well KEW-4U to -14.74 feet msl in monitor well KI-8 (Table 3; Figure 4, Upper Intermediate Zone Groundwater <br /> Elevations; and Figure 5, Lower Intermediate Zone Groundwater Elevations). <br /> 3.1.3 Deep Zone <br /> On October 30,2018,water-level elevations in the deep zone ranged from-17.02 feet msl in well KD-1 to-16.35 feet <br /> msl in well INJ-1(Table 3 and Figure 6, Deep Zone Groundwater Elevations). <br /> 3.2 Groundwater Movement <br /> The direction of groundwater movement in the intermediate zone is controlled by the pumping of extraction wells on <br /> site and/or production wells in the vicinity of the site.When the on-site extraction wells are operating,groundwater in <br /> the intermediate zone flows toward the center of the site. Extraction from the on-site extraction wellfield also causes <br /> flow in the shallow zone to be downward and toward the center of the site. Groundwater flow in the deep zone is <br /> influenced by pumping in nearby water supply wells.When the on-site extraction wells are not pumping,the pumping <br /> of water supply wells surrounding the site dictates the direction of flow beneath the site in all zones. In particular,the <br /> D U D E K 10886-1 <br /> 7 March 2019 <br />