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Table of Contents <br />Executive Summary iii <br />~ Section 1 -Introduction 1 <br />].I Purpose and Objective 1 <br />1.2 Scopc of Work 1 <br />1.3 Authorization 2 <br />1.4 Project Personnel 2 <br />' 1.5 Background 2 <br />1.6 Elevation Datum 3 <br />t Section 2 -Subsurface Conditions 4 <br />2.1 General 4 <br />2.2 Fill 4 <br />' 2.3 Alluvium 4 <br />2.4 Bedrock 5 <br />2.5 Groundwater Conditions 6 <br />' Section 3 -Slope Stability Analvses 8 <br />3.1 General 8 <br />' <br />3.2 General Assumptions and Slope Stability Design Criteria 8 <br />3.3 Representative Cross Sections 9 <br />3.4 Material Properties for Stability Analyses 10 <br />' <br />3.5 Water Pressures 10 <br />3.6 Analysis Methodology 11 <br />3.7 Results of Stability Analyses 11 <br />' <br />3.8 Stabilization Fill Areas 12 <br />3.9 Soil-Bentonite Cutoff Wall Horizontal Alignment 13 <br />' Section 4 -Seepage Analvses 15 <br />4.1 General 15 <br />4.2 Allowable Leakage 15 <br />4.3 Representative Cross Sections 17 <br />4.4 Hydraulic Conductivities 18 <br />4.5 Parametric Study 19 <br />' <br />4.6 Factor of Safety Variation with Depth of Cutoff Wall 20 <br />4.7 Selected Design Factor of Safety 21 <br />~ 4.8 Soil-Bentonite Cutoff Wall Vertical Alignment 21 <br />Section 5 -Future Considerations 24 <br />Section 6 -Limitations 25 <br />