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2018 ANNUAL GROUNDWATER MONITORING REPORT FORMER KEARNEY—KPF FACILITY-STOCKTON,CALIFORNIA
<br /> 3.4.2 Intermediate Zone
<br /> Water levels decreased in all but two intermediate zone wells(KEW-3U and KEW-4U) between May and October 2018.
<br /> Net water level decreases ranged from 0.09 feet in well KI-5 to 9.72 feet in well KI-12. Net water levels in KEW-3U and
<br /> KEW-4U increased by 0.79 and 2.21 feet, respectively.
<br /> Water levels generally varied in all intermediate zone wells between October 2017 and October 2018.Water levels
<br /> decreased in 11 of the intermediate zone wells (KEW-1U, KI-3, KI-5, KI-6, KI-11, KI-12, KI-13, KI-14, KI-18, KPU-5,
<br /> and KPL-5) and increased in 10 of the intermediate zone wells (KEW-2U, KEW-3U, KEW-4U, KI-2, KI-4, KI-8, KI-16,
<br /> KI-17, KI-19, and PX-1). Net water level increases between October 2017 and October 2018 ranged from 0.26 feet
<br /> in well PX-1 to 2.21 feet in well KEW-4U. Net water level decreases between October 2017 and October 2018
<br /> ranged from 0.06 feet in well KI-14 to 2.99 feet in well KI-12.
<br /> The trend in the intermediate zone is similar to the shallow zone, with the larger water level increases occurring
<br /> during the wetter season,typically October-March. In addition, as noted previously, CWS wells pumped less water
<br /> during this period and well CWS-77,the closest production well to the site, was not pumped after May 2016.
<br /> 3.4.3 Deep Zone
<br /> Water levels decreased in all deep zone wells between May and October 2018. Net water level decreases ranged
<br /> from 2.18 feet in well INJ-1 to 2.62 feet in well KD-1.
<br /> Water levels increased in all deep zone wells between October 2017 and October 2018. Net water level increases
<br /> between October 2017 and October 2018 ranged from 0.13 feet in well KD-1 to 0.84 feet in well INJ-1.
<br /> The trend in the deep zone is similar to the shallow and intermediate zones, with the larger water-level increases
<br /> occurring during the wetter season between October and March. In addition, as noted previously, CWS wells
<br /> pumped less water during this period, and well CWS-77, the closest production well to the site, was not pumped
<br /> after May 2016.
<br /> 3.5 Effects of Municipal Production Well Pumping
<br /> Five active municipal wells are within a 1-mile radius of the site(Figure 18,Site Location).Two of these wells(CWS-
<br /> 71 and CWS-77)are located generally to the west of the site.Three wells(CWS-21,CWS-7,and CWS-78)are located
<br /> generally to the east of the site. Water levels were measured in on-site wells on October 30, 2018. On-site
<br /> intermediate zone extraction wells were pumping on October 30, 2018. Well CWS-77, located just beyond the
<br /> western border of the site, was not pumping on October 30, 2018 (Table 4, Volatile Organic Compounds and 1,4-
<br /> Dioxane in Groundwater Samples, and Figure 18); therefore, lateral groundwater flow in the deep zone was not
<br /> influenced by the nearby CWS well.
<br /> Between July and December 2018,the cumulative production from CWS wells located east of the site was greater
<br /> than the cumulative production from CWS wells west of the site (Table 5 and Figure 19). Total production volume
<br /> in the wells east of the site was greater between July and December 2018 compared to production for the same
<br /> months in 2017. Total production volume between July and December 2018 in the wells west of the site was
<br /> approximately 30%greater than for the same months in 2017 (Table 5 and Figure 19).
<br /> Water levels at the site increased on average by less than a foot in the shallow, intermediate, and deep zones
<br /> between October 2017 and October 2018. Municipal groundwater extraction increased between 2017 and 2018.
<br /> D U D E K 10886-1
<br /> 11 March 2019
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