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<br />Foothill Sanitary Landfill Page ii San Joaquin County DPW - Solid Waste <br />Joint Technical Document Revised 6/09/2020 <br />4.5. TOPOGRAPHY ...................................................................................................................... 8 <br />4.6. CLIMATOLOGY ..................................................................................................................... 8 <br />4.6.1. ISOHYETAL MAP AND PRECIPITATION ............................................................................. 8 <br />4.6.2. FLOODPLAIN ..................................................................................................................... 8 <br />4.6.3. DESIGN STORM ................................................................................................................. 8 <br />4.6.4. EVAPORATION .................................................................................................................. 8 <br />4.6.5. RUN-ON AND RUNOFF VOLUME AND PATTERN .............................................................. 9 <br />4.6.6. WIND ROSE ....................................................................................................................... 9 <br />4.7. GEOLOGY ............................................................................................................................. 9 <br />4.7.1. REGIONAL GEOLOGY ........................................................................................................ 9 <br />4.7.1.1. LAGUNA FORMATION (TL) ...................................................................................... 10 <br />4.7.1.2. MEHRTEN FORMATION (TM) .................................................................................. 10 <br />4.7.2. LOCAL GEOLOGY ............................................................................................................. 11 <br />4.8. REGIONAL FAULTING AND SEISMICITY ............................................................................. 11 <br />4.9. ENGINEERING AND CHEMICAL PROPERTIES OF SOIL ....................................................... 12 <br />4.9.1. STABILITY ANALYSIS........................................................................................................ 12 <br />4.10. HYDROGEOLOGIC SETTING ............................................................................................ 13 <br />4.10.1. REGIONAL HYDROGEOLOGY ................................................................................... 13 <br />4.10.2. SITE HYDROGEOLOGY ............................................................................................. 13 <br />4.10.2.1. HYDRAULIC CONDUCTIVITY................................................................................. 13 <br />4.10.2.2. GROUNDWATER .................................................................................................. 14 <br />4.10.2.3. SURFACE WATERS ............................................................................................... 14 <br />4.10.2.4. SPRINGS ............................................................................................................... 15