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ITABLE OF CONTENTS <br />PAGE <br />LIST <br />OF TABLES <br />LIST <br />OF FIGURES <br />1.0 <br />INTRODUCTION AND SUMMARY <br />1-1 <br />BACKGROUND <br />1-1 <br />j1.1 <br />• <br />1.2 EMBANKMENT EVALUATION <br />1-2 <br />1.3 SUMMARY OF CONCLUSIONS <br />1-3 <br />1 <br />1.4 SUMMARY OF RECOMMENDATIONS <br />1-6 <br />2.0 <br />DAM INVESTIGATIONS AND RESULTS <br />2-1 <br />2.1 DAM HISTORY AND PREVIOUS INVESTIGATIONS <br />2-1 <br />2.2 ADDITIONAL D'APPOLONIA INVESTIGATIONS AND <br />IOBSERVATIONS <br />2-5 <br />2.2.1 Grouting Program Observations <br />2-5 <br />2.2.2 Piezometer Installation - December 1982 <br />2-9 <br />. <br />2.2.3 Additional Readings and Measurements <br />at Existing Monitoring Points <br />2-12 <br />1 <br />2.2.4 Changes in Downstream Seepage Conditions <br />2-12 <br />2.3 LABORATORY TESTING RESULTS <br />2-13 <br />3.0 <br />LOWER TAILINGS DAM MODEL <br />3-1 <br />3.1 DAM EMBANKMENT <br />3-1 <br />3.1.1 Materials <br />3-1 <br />3.1.2 Geometry <br />3-2 <br />3.1.3 Hydrologic Parameters <br />3-2 <br />3.2 DAM FOUNDATION <br />3-3 <br />3.2.1 Materials <br />3-3 <br />3.2.2 Hydrologic Parameters <br />3-5 <br />3.3 FLOW PATHS AND HYDROSTATIC PRESSURES <br />3-5 <br />4.0 <br />EMBANKMENT ANALYSIS AND EVALUATION <br />4-1 <br />4.1 SLOPE STABILITY ANALYSIS <br />4-1 <br />4.1.1 Material Properties <br />4-2 <br />