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Phelan Development Holly Master Plan - Buildings H & 1 <br /> 15188.000.006 Geotechnical Exploration <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.................................................................................................... 1 <br /> 1.3 PROJECT DESCRIPTION..............................................................................................2 <br /> 1.4 SITE BACKGROUND.....................................................................................................2 <br /> 2.0 FINDINGS ............................................................................................................ 2 <br /> 2.1 FIELD EXPLORATION...................................................................................................2 <br /> 2.1.1 Borings..............................................................................................................3 <br /> 2.1.2 Cone Penetration Tests......................................................................................3 <br /> 2.1.3 Test Pits.............................................................................................................3 <br /> 2.2 GEOLOGY AND SEISMICITY........................................................................................4 <br /> 2.2.1 Geology.............................................................................................................4 <br /> 2.2.1 Seismicity ..........................................................................................................4 <br /> 2.3 SURFACE CONDITIONS...............................................................................................5 <br /> 2.4 SUBSURFACE CONDITIONS........................................................................................5 <br /> 2.5 GROUNDWATER CONDITIONS....................................................................................6 <br /> 2.6 LABORATORY TESTING...............................................................................................7 <br /> 3.0 CONCLUSIONS ................................................................................................... 7 <br /> 3.1 EXISTING FILL ..............................................................................................................7 <br /> 3.2 EXPANSIVE SOIL..........................................................................................................8 <br /> 3.3 SEISMIC HAZARDS.......................................................................................................8 <br /> 3.3.1 Ground Rupture.................................................................................................8 <br /> 3.3.2 Ground Shaking.................................................................................................8 <br /> 3.3.3 Liquefaction .......................................................................................................9 <br /> 3.3.3.1 Liquefaction-Induced Settlement.........................................................9 <br /> 3.3.4 Densification Due to Earthquake Shaking...........................................................9 <br /> 3.3.5 Lateral Spreading............................................................................................. 10 <br /> 3.4 FLOODING .................................................................................................................. 10 <br /> 3.5 SOIL CORROSION POTENTIAL.................................................................................. 10 <br /> 3.6 SHALLOW GROUNDWATER....................................................................................... 11 <br /> 3.7 2019 CBC SEISMIC DESIGN PARAMETERS.............................................................. 12 <br /> 4.0 CONSTRUCTION MONITORING ...................................................................... 12 <br /> 5.0 EARTHWORK RECOMMENDATIONS.............................................................. 13 <br /> 5.1 EXISTING FILL REMOVAL .......................................................................................... 13 <br /> 5.2 EXPANSIVE SOIL MITIGATION................................................................................... 13 <br /> 5.3 GENERAL SITE CLEARING......................................................................................... 13 <br /> 5.4 OVER-OPTIMUM SOIL MOISTURE CONDITIONS...................................................... 14 <br /> 5.5 ACCEPTABLE FILL...................................................................................................... 14 <br /> 5.6 REUSE OF ON-SITE RECYCLED MATERIALS........................................................... 14 <br /> 5.7 FILL COMPACTION..................................................................................................... 14 <br /> 5.7.1 Grading in Structural Areas.............................................................................. 14 <br /> 5.7.2 Underground Utility Backfill .............................................................................. 15 <br /> ENGEO ii December 13, 2021 <br /> Expect Excellence- <br />