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EARTH STRATA GEOTECHNICAL SERVICES Page i March 30, 2023 Project No. 234812-10A <br />TABLE OF CONTENTS <br />Section Page <br /> <br />INTRODUCTION ....................................................................................................................................................1 <br />SITE DESCRIPTION ...............................................................................................................................................1 <br />PROPOSED DEVELOPMENT ............................................................................................................................1 <br />FIELD EXPLORATION AND LABORATORY TESTING ......................................................................................3 <br />Field Exploration ..............................................................................................................................................3 <br />Laboratory Testing ..........................................................................................................................................3 <br />FINDINGS ................................................................................................................................................................3 <br />Regional Geology ..............................................................................................................................................3 <br />Local Geology ....................................................................................................................................................4 <br />Faulting ..............................................................................................................................................................6 <br />Landslides ..........................................................................................................................................................6 <br />CONCLUSIONS AND RECOMMENDATIONS .......................................................................................................6 <br />General ...............................................................................................................................................................6 <br />Earthwork ..........................................................................................................................................................7 <br />Earthwork and Grading ..............................................................................................................................7 <br />Clearing and Grubbing ................................................................................................................................7 <br />Excavation Characteristics .........................................................................................................................7 <br />Groundwater .................................................................................................................................................7 <br />Ground Preparation for Fill Areas ............................................................................................................7 <br />Oversize Rock ...............................................................................................................................................8 <br />Compacted Fill Placement ..........................................................................................................................8 <br />Import Earth Materials ...............................................................................................................................8 <br />Cut/Fill Transitions .....................................................................................................................................9 <br />Cut Areas ........................................................................................................................................................9 <br />Shrinkage, Bulking and Subsidence .........................................................................................................9 <br />Geotechnical Observations ......................................................................................................................10 <br />Post Grading Considerations .......................................................................................................................10 <br />Slope Landscaping and Maintenance .....................................................................................................10 <br />Site Drainage ...............................................................................................................................................10 <br />Utility Trenches ..........................................................................................................................................10 <br />SEISMIC DESIGN CONSIDERATIONS ................................................................................................................11 <br />Ground Motions ..............................................................................................................................................11 <br />Secondary Seismic Hazards .........................................................................................................................12 <br />Liquefaction and Lateral Spreading ...........................................................................................................12 <br />General .............................................................................................................................................................13 <br />Allowable Bearing Values .............................................................................................................................13 <br />Settlement........................................................................................................................................................13 <br />Lateral Resistance ..........................................................................................................................................13 <br />Structural Setbacks and Building Clearance ............................................................................................14 <br />Foundation Observations .............................................................................................................................15 <br />Expansive Soil Considerations ....................................................................................................................15 <br />Post Tensioned Slab/Foundation Design Recommendations ...............................................................15 <br />Corrosivity .......................................................................................................................................................17 <br />RETAINING WALLS .............................................................................................................................................18 <br />2130 E 4th St <br />2/11/2025