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CONTENTS <br /> LIST OF TABLES AND ILLUSTRATIONS Iv <br /> 1 INTRODUCTION 1-1 <br /> 2 BACKGROUND 2-3 <br /> 2.1 Regional Hydrology 2-3 <br /> 2.2 Local Hydrology 2-3 <br /> 2.3 Groundwater Gradient and Velocity 2-4 <br /> 2.4 Monitoring Network 2-5 <br /> 2.5 Monitoring and Response Actions 2-5 <br /> 3 NATURE AND EXTENT OF RELEASE 3-1 <br /> 3.1 Nature of Release 3-1 <br /> 3.1.1 Fourth Quarter 1994 Results 3-2 <br /> 3.2 Extent of Release 3-3 <br /> 4 FEASIBILITY STUDY 4-1 <br /> 4.1 Alternatives Description 4-1 <br /> 4.1.1 No Action 4-1 <br /> 4.1.2 Source Control 4-2 <br /> 4.1.3 Groundwater Extraction and Treatment 4-3 <br /> 4.1.4 Physical Barriers 4-4 <br /> 4.2 Alternative Evaluation 4-4 <br /> 4.2.1 Implementability 4-5 <br /> 4.2.2 Effectiveness 4-5 <br /> 4.2.3 Permanence 4-6 <br /> SAC�N.\PJGM39M390031.9BG-94\sdg:1 Rev.0,420/95 <br /> 0939-003.19 1 <br />