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January 3, 2025 <br />HWA Project No. 2021-159-21 <br /> <br /> <br />Geotechnical Engineering Report ii HWA GEOSCIENCES INC. <br />Port Gardner Storage Facility <br />4.6.4 Lateral Evaluation – Effluent Pump Station, CS Vault 30-01, and OMES <br />Generator Pad .................................................................................................36 <br />4.6.5 Impact of Lateral Spreading on Pile Capacity ...............................................36 <br />4.6.6 Micropile Design Considerations ...................................................................36 <br />4.6.7 Micropile Construction ..................................................................................37 <br />4.6.8 Construction Considerations and Monitoring of Pile Installation..................38 <br />4.7 NON-PILE-SUPPORTED DESIGN .................................................................................39 <br />4.7.1 Lift Station 46 ................................................................................................39 <br />4.7.2 General Shallow Foundations ........................................................................39 <br />4.7.3 Hydrostatic Uplift Pressure ............................................................................40 <br />4.7.4 Static Settlements ...........................................................................................40 <br />4.7.5 Shallow Foundation Overexcavation/Subgrade Preparation .........................40 <br />4.8 BELOW-GRADE STRUCTURES ....................................................................................41 <br />4.8.1 Buoyancy and Uplift Considerations .............................................................42 <br />4.8.2 Lateral Earth Pressures ...................................................................................42 <br />4.9 UTILITIES...................................................................................................................42 <br />4.9.1 Utility Subgrade Preparation ..........................................................................43 <br />4.9.2 Utility Pipe Bedding .......................................................................................43 <br />4.9.3 Lightweight Backfill for Utilities ...................................................................44 <br />4.9.4 Trench Backfill Placement and Compaction ..................................................44 <br />4.10 EXCAVATIONS AND CAVING ......................................................................................45 <br />4.11 TEMPORARY SHORED EXCAVATIONS ........................................................................46 <br />4.12 DEWATERING ............................................................................................................47 <br />4.13 GENERAL EARTHWORK CONSIDERATIONS ................................................................48 <br />4.13.1 Structural Fill .................................................................................................48 <br />4.13.2 Compaction ....................................................................................................48 <br />4.13.3 Wet Weather Earthwork .................................................................................49 <br />4.14 ENVIRONMENTAL CONSIDERATIONS .........................................................................49 <br />5.0 CONDITIONS AND LIMITATIONS ..............................................................................51 <br />6.0 REFERENCES ............................................................................................................53