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River Islands Development at Lathrop January 2021 <br /> FINAL River Islands Non-Potable Water Technical Report Rev 2 #6520 <br /> Table of Contents <br /> 1 Introduction ............................................................................................................................................5 <br /> 1.1 Background.....................................................................................................................................5 <br /> 1.2 Report Objectives...........................................................................................................................6 <br /> 2 Non-Potable Water Irrigation Areas.......................................................................................................7 <br /> 2.1 Non-Potable Water Irrigation Areas— Phase I ...............................................................................7 <br /> 2.2 Non-Potable Water Irrigation Areas— Phase II ..............................................................................8 <br /> 3 Non-Potable Water Supply Requirements...........................................................................................10 <br /> 3.1 Non-Potable Water Supply Requirements ...................................................................................10 <br /> 3.2 Historical Average Year Precipitation and Evapotranspiration Data —California Irrigation <br /> Management Information System ...........................................................................................................10 <br /> 3.3 Non-Potable Water Peak Month Irrigation Demand Factors........................................................10 <br /> 3.3.1 Non-Potable Water Peak Month Irrigation Demand Factors Over 8-Hour Irrigation Window.11 <br /> 3.4 Non-Potable Water Peak Month Irrigation Demands Over 8-Hour Irrigation Window.................12 <br /> 3.5 Non-Potable Water Pumping Capacity Requirements— Existing Main Pump Station.................13 <br /> 3.6 Non-Potable Water Pumping Capacity Requirements— Proposed Phase II NPW Pump Stations <br /> 14 <br /> 4 River Islands Non-Potable Water Distribution Model — Basis of Design, Assumptions, &Analysis <br /> Parameters..................................................................................................................................................15 <br /> 4.1 WaterGEMS Model.......................................................................................................................15 <br /> 4.2 WaterGEMS Model Basis and Assumptions................................................................................15 <br /> 4.2.1 Hydraulic Model Assumptions -Areas Without Finalized Improvement Plans.......................15 <br /> 4.2.2 Hydraulic Model Assumptions - Stage 2A Irrigation Cover Exhibit Discrepancies .................16 <br /> 4.2.3 River Islands Non-Potable Water Distribution System and Hydraulic Model Assumptions....16 <br /> 4.2.3.1 RI NPW Distribution System Hydraulic Model Assumptions - Sources of Non-Potable <br /> Water 19 <br /> 4.2.3.1.1 Primary Sources of Non-Potable Water—City of Lathrop's RW Distribution System 19 <br /> 4.2.3.1.2 Secondary Sources of Non-Potable Water................................................................19 <br /> 4.2.3.2 RI NPW Distribution System Hydraulic Model Assumptions - Existing Main Pump Station <br /> 19 <br /> 4.2.3.3 RI NPW Distribution System Hydraulic Model Assumptions — Proposed Phase II Non- <br /> PotableWater Pump Station............................................................................................................19 <br /> 5 River Islands Non-Potable Water Distribution System Model - Results..............................................20 <br /> 5.1 Steady State Analysis Results— Peak Month Irrigation Demands - Recommendations .............20 <br /> 5.2 Steady State Analysis Results— Peak Month Irrigation Demands...............................................22 <br /> 6 Preliminary Improvement Implementation Schedule...........................................................................26 <br /> 6.1 Preliminary Improvement Implementation Schedule....................................................................26 <br /> 2 <br />