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330 Land Company, LLC Arroyo Lago <br />9785.004.001 Design-Level Geotechnical Report <br /> <br />TABLE OF CONTENTS (Continued) <br /> <br /> <br /> ii of ii April 16, 2024 <br />Latest Revision October 31, 2025 <br />5.3.2 Emergency Swale ................................................................................................ 17 <br />5.4 ACCEPTABLE FILL .......................................................................................................... 17 <br />5.4.1 On-Site Existing Fill .............................................................................................. 17 <br />5.4.2 Import Fill ............................................................................................................. 17 <br />5.5 OVER-OPTIMUM SOIL MOISTURE CONDITIONS ......................................................... 17 <br />5.6 FILL PLACEMENT ............................................................................................................ 18 <br />5.7 UNDERGROUND UTILITY BACKFILL ............................................................................. 18 <br />5.8 GRADED SLOPES ........................................................................................................... 19 <br />5.9 SURFACE DRAINAGE ..................................................................................................... 19 <br />5.10 STORMWATER BIOTREATMENT AND INFILTRATION ................................................ 19 <br />5.11 LANDSCAPING CONSIDERATION ................................................................................. 20 <br />6.0 FOUNDATION RECOMMENDATIONS ............................................................. 21 <br />6.1 POST-TENSIONED MAT FOUNDATIONS ...................................................................... 21 <br />6.2 FOUNDATION SUBGRADE MOISTURE VAPOR REDUCTION ..................................... 21 <br />6.3 2025 CBC SEISMIC DESIGN PARAMETERS ................................................................. 22 <br />6.4 EXTERIOR FLATWORK ................................................................................................... 23 <br />7.0 RETAINING WALL RECOMMENDATIONS ...................................................... 23 <br />7.1 LATERAL SOIL PRESSURES .......................................................................................... 23 <br />7.2 RETAINING WALL FOOTINGS ........................................................................................ 24 <br />7.3 RETAINING WALL DRAINAGE ........................................................................................ 24 <br />7.4 WALL BACKFILL .............................................................................................................. 24 <br />8.0 PAVEMENT DESIGN ......................................................................................... 25 <br />8.1 FLEXIBLE PAVEMENT .................................................................................................... 25 <br />8.2 RIGID PAVEMENT ........................................................................................................... 25 <br />8.3 PAVEMENT SUBGRADE PREPARATION ...................................................................... 25 <br />9.0 LIMITATIONS AND UNIFORMITY OF CONDITIONS ....................................... 26 <br />SELECTED REFERENCES <br />FIGURES <br />APPENDIX A – Boring Logs (ENGEO, 2024) <br />APPENDIX B – Laboratory Test Data (ENGEO, 2024) <br />APPENDIX C – Corrosivity Results (CERCO Analytical, 2023) <br />APPENDIX D – Previous Exploration Logs and Laboratory Test Data (ENGEO, 2022) <br />APPENDIX E – Historical Exploration and Laboratory Data (Treadwell & Rollo, 2006 and 2009) <br />