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River Islands Development at Lathrop January 2021 <br /> Final River Islands Potable Water Technical Report—Rev 3 #6520 <br /> Table of Contents <br /> 1 Introduction ............................................................................................................................................6 <br /> 1.1 Background.....................................................................................................................................6 <br /> 1.2 Report Objectives...........................................................................................................................6 <br /> 2 Potable Water Supply Requirements.....................................................................................................8 <br /> 2.1 River Islands Land Uses.................................................................................................................8 <br /> 2.2 Average Day Demands ..................................................................................................................9 <br /> 2.3 Maximum Day Demands and Peak Hour Demands.......................................................................9 <br /> 2.4 Fire Flow Requirements ...............................................................................................................10 <br /> 2.5 Potable Water Pumping Capacity Requirements— Phase I City of Lathrop Potable Water <br /> Storage and Booster Pump Station at River Islands...............................................................................11 <br /> 2.6 Potable Water Pumping Capacity Requirements— Proposed Phase II City of Lathrop Potable <br /> Water Storage and Booster Pump Station at River Islands....................................................................12 <br /> 3 Potable Water Storage Requirements.................................................................................................13 <br /> 3.1 Potable Water Storage Requirements..........................................................................................13 <br /> 3.2 Potable Water Storage Requirements— Phase I City of Lathrop Potable Water Storage and <br /> Booster Pump Station at River Islands....................................................................................................14 <br /> 3.3 Potable Water Storage Requirements— Proposed Phase II City of Lathrop Potable Water <br /> Storage and Booster Pump Station at River Islands...............................................................................14 <br /> 4 River Islands Potable Water Distribution System and Model ..............................................................15 <br /> 4.1 WaterGEMS Model.......................................................................................................................15 <br /> 4.1.1 WaterGems Model Basis and Assumptions............................................................................15 <br /> 4.1.1.1 Areas Without Finalized Improvement Plans Assumptions ............................................15 <br /> 4.1.2 Fire Flow Analysis...................................................................................................................16 <br /> 4.2 City of Lathrop's Potable Water Distribution System — River Islands...........................................17 <br /> 4.2.1 Potable Water Supply—City of Lathrop's Potable Water Distribution System .......................17 <br /> 4.2.2 Potable Water Supply—South San Joaquin Irrigation District/South County Water Supply <br /> Program ...............................................................................................................................................19 <br /> 4.2.2.1 SSJID Turnout#2 /SSJID Potable Water Storage and Transfer Pump Station at River <br /> Islands (Site A).................................................................................................................................20 <br /> 4.2.2.2 Hydraulic Model Assumptions—Steady State Analysis..................................................21 <br /> 4.2.3 Sources of Distribution Pressure and Storage— Phase I City of Lathrop Potable Water <br /> Storage and Pump Station at River Islands (Phase I BPS).................................................................21 <br /> 4.2.3.1 Phase I BPS Potable Water Storage Tanks ...................................................................22 <br /> 4.2.3.1.1 Hydraulic Model Assumptions—Steady State Analysis.............................................22 <br /> 4.2.3.2 Phase I BPS Potable Water Booster Pump Station........................................................23 <br /> 4.2.3.2.1 Hydraulic Model Assumptions—Steady State Analysis.............................................23 <br /> 4.2.3.3 Proposed Phase II City of Lathrop Potable Water Storage and Booster Pump Station at <br /> River Islands (Phase II BPS)............................................................................................................24 <br /> 4.2.3.3.1 Hydraulic Model Assumptions—Steady State Analysis.............................................24 <br /> 5 River Islands Potable Water Distribution Model - Results...................................................................26 <br /> 5.1 Steady State Analysis Results—Average Day Demands............................................................26 <br /> 2 <br />