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2020 GROUNDWATER MONITORING REPORT <br />arcadis.com ES-1 <br />CONTENTS <br />Acronyms and Abbreviations .......................................................................................................................... <br />1 Introduction ............................................................................................................................................. 1 <br />1.1 Site Location ................................................................................................................................... 1 <br />1.2 Site History ..................................................................................................................................... 1 <br />1.3 Site Regulatory History ................................................................................................................... 2 <br />1.3.1 Baseline Groundwater Monitoring Program ........................................................................ 2 <br />1.3.2 November 21, 2008 Groundwater Monitoring Plan ............................................................ 3 <br />1.3.3 February 17, 2009 Groundwater Monitoring Plan ............................................................... 3 <br />1.3.4 July 7, 2010 Groundwater Monitoring Plan ......................................................................... 4 <br />1.3.5 October 17, 2014 Proposal to Remove Sodium as a Groundwater Quality Parameter ..... 4 <br />2 Groundwater Sampling Activities ............................................................................................................ 5 <br />3 Results .................................................................................................................................................... 6 <br />3.1 Groundwater Elevations and Flow Characteristics ........................................................................ 6 <br />3.2 Analytical Results ........................................................................................................................... 6 <br />4 Conclusions and recommendations ....................................................................................................... 8 <br />5 References ............................................................................................................................................. 9 <br /> <br />TABLES <br />Table 1 March 2020 Depth to Groundwater Measurements and Groundwater Elevations <br />Table 2 March 2020 Field and Analytical Results <br /> <br />FIGURES <br />Figure 1 Site Location Map <br />Figure 2 Groundwater Contour Map <br />Figure 3 Potassium to Sodium Ratio Time Series Graph <br />Figure 4 Total Dissolved Solids Time Series Graph <br />Figure 5 Sulfate Time Series Graph