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330 Land Company, LLC Arroyo Lago <br />9785.004.001 Design-Level Geotechnical Report <br /> <br /> <br /> i of ii April 16, 2024 <br />Latest Revision October 31, 2025 <br />TABLE OF CONTENTS <br />LETTER OF TRANSMITTAL <br />1.0 INTRODUCTION .................................................................................................. 1 <br />1.1 PURPOSE AND SCOPE .................................................................................................... 1 <br />1.2 PROJECT LOCATION ........................................................................................................ 2 <br />1.3 PROJECT DESCRIPTION .................................................................................................. 3 <br />2.0 FINDINGS ............................................................................................................ 3 <br />2.1 SITE HISTORY ................................................................................................................... 3 <br />2.2 EXISTING AND NEARBY GEOTECHNICAL DATA ........................................................... 4 <br />2.3 FIELD EXPLORATION ....................................................................................................... 5 <br />2.4 GEOLOGY AND SEISMICITY ............................................................................................ 5 <br />2.4.1 Regional Geology .................................................................................................. 5 <br />2.4.2 Local Geology ........................................................................................................ 5 <br />2.4.3 Seismicity ............................................................................................................... 6 <br />2.5 SUBSURFACE CONDITIONS ............................................................................................ 6 <br />2.5.1 Existing Fill ............................................................................................................. 7 <br />2.5.2 Engineered Fill (Busch Pit) .................................................................................... 7 <br />2.5.3 Floodplain Deposits ............................................................................................... 7 <br />2.6 GROUNDWATER CONDITIONS ....................................................................................... 7 <br />2.7 LABORATORY TESTING ................................................................................................... 8 <br />3.0 CONCLUSIONS ................................................................................................... 8 <br />3.1 EXISTING FILL ................................................................................................................... 9 <br />3.2 EXPANSIVE SOIL ............................................................................................................... 9 <br />3.3 SEISMIC HAZARDS ......................................................................................................... 10 <br />3.3.1 Ground Rupture ................................................................................................... 10 <br />3.3.2 Ground Shaking ................................................................................................... 10 <br />3.3.3 Liquefaction .......................................................................................................... 10 <br />3.3.4 Lateral Spreading ................................................................................................. 11 <br />3.4 COMPRESSIBLE SOIL .................................................................................................... 11 <br />3.5 DIFFERENTIAL FILL ........................................................................................................ 12 <br />3.5.1 Busch Pit .............................................................................................................. 12 <br />3.5.2 Emergency Swale ................................................................................................ 13 <br />3.6 SOIL CORROSION POTENTIAL ...................................................................................... 13 <br />4.0 CONSTRUCTION MONITORING ...................................................................... 14 <br />5.0 EARTHWORK RECOMMENDATIONS ............................................................. 14 <br />5.1 GENERAL DEMOLITION AND SITE CLEARING ............................................................ 14 <br />5.2 SURCHARGE PROGRAM ............................................................................................... 15 <br />5.2.1 Surcharge Settlement Monitoring Program ......................................................... 16 <br />5.3 DIFFERENTIAL FILL SLOPE MITIGATION ..................................................................... 16 <br />5.3.1 Busch Pit .............................................................................................................. 16 <br />5.3.1.1 Option 1: Subexcavation and Recompaction ...................................... 16 <br />5.3.1.2 Option 2: Thickened Mat or Deep Foundations ................................... 17