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TABLE OF CONTENTS <br /> ' SECTION 1 PROJECT DESCRIPTION...............................................................................................1.1 <br /> SECTION 2 HISTORICAL SITE INVESTIGATIONS............................................................................2-1 <br /> SECTION 3 SITE INVESTIGATION AND SUBSURFACE CONDITIONS ..........................................3-1 <br /> 3.1 Site Conditions.........................................................................................3-1 <br /> 3.2 Subsurface Exploration............................................................................3-1 <br /> 3.3 Subsurface Conditions.............................................................................3-2 <br /> 3.4 Groundwater Conditions..........................................................................3-3 <br /> SECTION 4 GEOTECHNICAL EVALUATIONS::::::::::..::::::::::..:::::::::::.:::::::::::..:::::............................4-1 <br /> 4.1 Settlement 4-1 <br /> 4.2 Slope Stability..........................................................................................4-2 <br /> 4.3 Seismic Considerations............................................................................4-3 <br /> 4.4 Mining Activity........................................................................................4-3 <br /> SECTION 5 BRIDGE DESIGN RECOMMENDATIONS.......................................................................5.1 <br /> ' 5.1 Spread Footings .......................................................................................5-1 <br /> 5.2 Drilled Shafts...........................................................................................5-1 <br /> ' 5.3 Piles..........................................................................................................5-1 <br /> SECTION 6 RETAINING WALL EVALUATIONS................................................................................6-1 <br /> 6.1 Approach Embankments..........................................................................6-1 <br /> 6.2 Underpass Backfill Retention..................................................................6-2 <br /> SECTION 7 CONSTRUCTION CONSIDERATIONS...........................................................................7-1 <br /> 7.1 Piling........................................................................................................7-1 <br /> 7.2 Existing Substructure Removal................................................................7-1 <br /> 7.3 Existing Retaining Wall Removal ...........................................................7-1 <br /> '. SECTION 8 CONTINUITY OF GEOTECHNICAL SERVICES.............................................................8-1 <br /> SECTION 9 LIMITATIONS...................................................................................................................9-1 <br /> SECTION 10 REFERENCES...............................................................................................................10-1 <br /> ' List of Tables <br /> Table 1 Estimated Settlement at the Substructures <br /> Table 2 Factors of Safety for Slope Stability <br /> Table 3 Design Parameters for MSE External Stability <br /> Table 4 Design Parameters for Underpass Retention Wall—Spread Footing <br /> Table 5 Design Parameters for Underpass Retention Wall—Drilled Shafts <br /> UR51 <br />