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4 PHYSICAL SETTING .....................................................................................................14 <br /> 4.1 TOPOGRAPHY................................................................................................... 14 <br /> 4.2 CLIMATOLOGY .................................................................................................. 14 <br /> 4.2.1 Isohyetal Map.......................................................................................... 14 <br /> 4.2.2 Floodplain................................................................................................ 14 <br /> 4.2.3 Precipitation............................................................................................. 15 <br /> 4.2.4 Design Storm........................................................................................... 15 <br /> 4.2.5 Runoff Volume and Pattern ..................................................................... 15 <br /> 4.2.6 Wind Rose............................................................................................... 16 <br /> 4.3 GEOLOGY .......................................................................................................... 16 <br /> 4.3.1 Geology................................................................................................... 17 <br /> 4.4 HYDROGEOLOGY ............................................................................................. 18 <br /> 4.4.1 Surface Water.......................................................................................... 18 <br /> 4.4.2 Regional Hydrogeology........................................................................... 19 <br /> 4.4.3 Hydraulic Conductivity............................................................................. 19 <br /> 4.4.4 Groundwater Flow................................................................................... 19 <br /> 4.4.5 Capillary Rise .......................................................................................... 19 <br /> 4.4.6 Springs ....................................................................................................20 <br /> 4.4.7 Groundwater Quality................................................................................20 <br /> 4.5 SURROUNDING LAND AND GROUNDWATER USE........................................21 <br /> 4.5.1 Land Use.................................................................................................21 <br /> i <br /> 4.5.2 Groundwater Use ....................................................................................21 <br /> 4.6 POTENTIAL IMPAIRMENT CAUSED BY NCRC&SL.........................................21 <br /> 5 FACILITIES CONSTRUCTION AND DESIGN...............................................................23 <br /> 5.1 INTRODUCTION.................................................................................................23 <br /> 5.2 DESIGN PLANS..................................................................................................24 <br /> 5.2.1 Previous Designs.....................................................................................24 <br /> 5.2.2 Future Design..........................................................................................25 <br /> 5.3 CONSTRUCTION SEQUENCING PLANS .........................................................26 <br /> 5.3.1 Excavation and Stockpiling Plans............................................................26 <br /> 5.3.2 Base Preparation and Liner Placement Plans.........................................27 <br /> North County RC&SL Page ii of xiii Public Works/Solid Waste <br /> Joint Technical Document County of San Joaquin—February 10,2010 <br />