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TABLE OF CONTENTS <br /> SECTION PAGE NO. <br /> ACRONYMS AND ABBREVIATIONS............................................................................................................................VII <br /> EXECUTIVESUMMARY...............................................................................................................................................IX <br /> 1 INTRODUCTION............................................................................................................................................. 1 <br /> 1.1 Background and Purpose ......................................................................................................................1 <br /> 1.2 Summary of Treatment System Operation............................................................................................1 <br /> 1.3 Summary of Groundwater Monitoring Field Activities..........................................................................3 <br /> 1.4 Summary of 2018 Site Operation and Maintenance Activities...........................................................3 <br /> 1.5 Condition of Former Pond Covers..........................................................................................................3 <br /> 2 DISCUSSION OF 2018 TREATMENT SYSTEM ACTIVITIES ............................................................................. 5 <br /> 2.1 Treatment System Monitoring...............................................................................................................5 <br /> 2.2 Treatment System Operation and Maintenance..................................................................................5 <br /> 3 WATER LEVELS............................................................................................................................................. 7 <br /> 3.1 Water Level Elevations...........................................................................................................................7 <br /> 3.1.1 Shallow Zone.............................................................................................................................7 <br /> 3.1.2 Intermediate Zone....................................................................................................................7 <br /> 3.1.3 Deep Zone.................................................................................................................................7 <br /> 3.2 Groundwater Movement........................................................................................................................7 <br /> 3.2.1 Shallow Zone.............................................................................................................................8 <br /> 3.2.2 Upper Intermediate Zone.........................................................................................................8 <br /> 3.2.3 Lower Intermediate Zone.........................................................................................................9 <br /> 3.2.4 Deep Zone.................................................................................................................................9 <br /> 3.3 Groundwater Movement Between Zones.............................................................................................9 <br /> 3.3.1 Shallow/Upper Intermediate Zones...................................................................................... 10 <br /> 3.3.2 Lower Intermediate/Deep Zones.......................................................................................... 10 <br /> 3.4 Changes in Water Levels..................................................................................................................... 10 <br /> 3.4.1 Shallow Zone.......................................................................................................................... 10 <br /> 3.4.2 Intermediate Zone................................................................................................................. 11 <br /> 3.4.3 Deep Zone.............................................................................................................................. 11 <br /> 3.5 Effects of Municipal Production Well Pumping.................................................................................. 11 <br /> 4 CHEMICAL QUALITY OF GROUNDWATER..................................................................................................... 13 <br /> 4.1 Constituent Concentrations................................................................................................................ 14 <br /> 4.1.1 Shallow Zone.......................................................................................................................... 14 <br /> 4.1.2 Intermediate Zone................................................................................................................. 14 <br /> 4.1.3 Deep Zone.............................................................................................................................. 14 <br /> 4.2 Long-Term Trends in Constituent Concentrations.................................................................................. 14 <br /> 4.3 Discussion of Remediation Progress ................................................................................................. 15 <br /> 4.3.1 Shallow Zone.......................................................................................................................... 16 <br /> D U D E K 10886-1 <br /> iii March 2019 <br />