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2016 GROUNDWATER MONITORING REPORT <br /> the background well, from the April 2016 sampling event(Table 2 and Figures 4, 5,and 6)remain higher <br /> than the wells installed downgradient of the CKD. <br /> As mentioned in Section 1.3.5, sodium was removed as a groundwater quality parameter for compliance <br /> and replaced with a potassium to sodium ratio of 0.5 as the NPL following the approval from the DRMS. <br /> As shown in Table 2 and on Figure 3, the potassium to sodium ratio in all monitoring wells continues to <br /> be generally less than 0.10, indicating that there is no discernible impact from the CKD disposal area. <br /> arcadis corn 7 <br />