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1 July 26, 2012 <br /> HWA Project No. 2007-087-21 <br /> I <br /> 1 7.5 SHEET PILE WALL DESIGN 21 <br /> 7.6 RESTROOM STRUCTURE FOUNDATIONS 24 <br /> 7.7 LOW RETAINING WALLS AND CONCRETE PLAZA 24 <br /> I7.8 FLOATING DOCK AND DOLPHIN SUPPORT RECOMMENDATIONS 25 <br /> 7.9 EMBANKMENT CONSTRUCTION AND STABILIZATION 25 <br /> I 7.9.1 Embankment Construction 25 <br /> 7.9.2 Structural Fill and Soil Compaction 26 <br /> 7.9.3 River Bank Stabilization 26 <br /> I 7.10 RAILROAD CORRIDOR TRAIL IMPROVEMENTS 28 <br /> 7.10.1 Trail Settlement Estimates 28 <br /> 7.10.2 Staged Construction for Railroad Corridor Trail 28 <br /> 1 7.10.3 Impacts to Storm Drains and Sanitary Sewer Force Main 29 <br /> 7.10.4 Impacts to the CSO Outfall Pipe 29 <br /> 1 7.11 NORTH WETLAND COMPLEX CHANNEL IMPROVEMENTS 30 <br /> 7.11.1 Channel Slope Stability 30 <br /> 7.11.2 Channel Grading 30 <br /> I 8. PAVEMENT RECOMMENDATIONS 32 <br /> 8.1 TRAIL PAVEMENT 32 <br /> 8.1.1 Design Traffic 32 <br /> 1 8.1.2 New Hot-Mix Asphalt (HMA)Pavement Design 33 <br /> 8.1.3 New Portland Cement Concrete (PCC) Pavement Design 33 <br /> I 8.2 PARKING LOT PAVEMENT 34 <br /> 8.3 ENTRANCE TO LIFT STATION#33 35 <br /> 8.4 SUBGRADE PREPARATION 35 <br /> I8.5 DRAINAGE 35 <br /> 9. CONDITIONS AND LIMITATIONS 36 <br /> 10. LIST OF REFERENCES 38 <br /> I <br /> LIST OF FIGURES(FOLLOWING TEXT) <br /> IFigure 1 Vicinity Map <br /> Figures 2A -2C Site and Exploration Plan <br /> I Figure 3 Cross Section B-B' <br /> Figure 4 Cross-Section A-A' — Slope Stability—Nisqually Earthquake Event for <br /> Verification of Soil Parameters <br /> I Figure 5 Cross-Section C-C' — Slope Stability—Nisqually Earthquake Event for <br /> Verification of Soil Parameters <br /> Figure 6 Cross-Section D-D' — Slope Stability—Nisqually Earthquake Event for <br /> I Figure 7 Verification of Soil Parameters <br /> Cross-Section A-A' — Slope Stability— Static Case with Proposed Fill <br /> Figure 8 Cross-Section A-A' — Slope Stability—Seismic Case with Proposed Fill <br /> I <br /> I2007-087 Public Amenities Final.doc ii HWA GEOSCIENCES INC. <br />