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<br />North County RC&SL Page iv of xv Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin – Revised February 11, 2026 <br />4.1 TOPOGRAPHY ................................................................................................. 13 <br />4.2 CLIMATOLOGY ................................................................................................. 13 <br />4.2.1 Isohyetal Map ......................................................................................... 13 <br />4.2.2 Floodplain ............................................................................................... 13 <br />4.2.3 Precipitation ........................................................................................... 14 <br />4.2.4 Design Storm ......................................................................................... 14 <br />4.2.5 Runoff Volume and Pattern .................................................................... 14 <br />4.2.6 Wind Rose .............................................................................................. 15 <br />4.3 GEOLOGY ......................................................................................................... 15 <br />4.3.1 Geology .................................................................................................. 16 <br />4.4 HYDROGEOLOGY ............................................................................................ 17 <br />4.4.1 Surface Water ........................................................................................ 17 <br />4.4.2 Regional Hydrogeology .......................................................................... 17 <br />4.4.3 Hydraulic Conductivity ............................................................................ 17 <br />4.4.4 Groundwater Flow .................................................................................. 18 <br />4.4.5 Capillary Rise ......................................................................................... 18 <br />4.4.6 Water Springs ........................................................................................ 18 <br />4.4.7 Groundwater Quality .............................................................................. 18 <br />4.5 SURROUNDING LAND AND GROUNDWATER USE ....................................... 19 <br />4.5.1 Land Use ................................................................................................ 19 <br />4.5.2 Groundwater Use ................................................................................... 19 <br />5 FACILITIES CONSTRUCTION AND DESIGN .............................................................. 21 <br />5.1 INTRODUCTION ............................................................................................... 21 <br />5.2 DESIGN PLANS ................................................................................................ 21 <br />5.2.1 Previous Designs ................................................................................... 21 <br />5.2.2 Future Design ......................................................................................... 23 <br />5.3 CONSTRUCTION SEQUENCING PLANS ......................................................... 24 <br />5.3.1 Excavation and Stockpiling Plans ........................................................... 24 <br />5.3.2 Base Preparation and Liner Placement Plans ........................................ 24 <br />5.3.3 Fill Sequencing Plans ............................................................................. 25 <br />5.4 LEACHATE COLLECTION AND REMOVAL SYSTEM ...................................... 25 <br />5.5 SURFACE WATER DRAINAGE AND EROSION PLANS .................................. 25 <br />5.6 LANDFILL GAS (LFG) MANAGEMENT PLAN ................................................... 26