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River Islands Development at Lathrop January 2021 Final River Islands Potable Water Technical Report—Rev 3 #6520 1 Introduction 1.1 Background River Islands, located on the Stewart Track in the City of Lathrop, is a 4,905-acre, master planned community to be constructed southwest of the San Joaquin River. The River Islands development will consist of low, medium and high density residential,schools(institutional), parks and commercial land uses. River Islands will be constructed in two separate phases known as Phase I and Phase 11. Phase I is currently being constructed over 4 separate stages and Phase II is entering the master planning stages. The River Islands development is located within the southwest area of the City of Lathrop's service area and will utilize the City's Potable Water(PW)distribution system for domestic,commercial,specific irrigation areas,and school PW demands. The distribution system will also service fire flows within the development. The City's distribution system operates as a single pressure zone, pressurized from different booster pump stations and storage sites spread throughout the City. The River Islands development will expand the City's distribution system to contain two additional City owned and operated Potable Water (PW) booster pump stations and water storage tank sites at full buildout conditions, in addition to the SSJID Turnout#2 and 1 MG Tank currently under construction. River Islands PW distribution system will be required to be planned, designed, and constructed per the City of Lathrop's Design and Construction Standards (City Standards) and the 2018 City of Lathrop's Water System Master Plan (City's Water Master Plan). The City Standards and Water Master Plan were created to provide the minimum requirements for all facilities and appurtenances to be turned over to the City for operation and maintenance. This report will be the basis for a required update to the City's Water Master Plan, including an update of the City's water system model, due to the increased level of detail now available, and due to City's determination that the water use per unit has decreased, the number of residential units has increased and the acres of commercial uses have decreased, together reducing the anticipated demand. 1.2 Report Objectives The objectives of the River Islands Potable Water Technical Report are as follows: • Provide updates to the previous Phase I Potable Water Master Plan prepared by PACE in 2017. • Analyze and quantify the land uses for Phase I and 11. • Analyze and model the Average Day Demands (ADD) for Phase I and 11 in accordance with the City of Lathrop's Standards, Water Master Plan and historical water uses provided by River Islands under Steady State Conditions. • Analyze and model the Maximum Day Demand (MDD) for Phase I and 11 in accordance with the City of Lathrop's Standards and Water Master Plan under Steady State Conditions. • Analyze and model the Peak Hour Demands (PHD)for Phase I and II in accordance with the City of Lathrop's Standards and Water Master Plan under Steady State Conditions. • Analyze and model the available fire flows for Phase I and 11 after potable water demands have been satisfied in accordance with the City of Lathrop's Standards and Water Master Plan. • Analyze and describe the overall River Islands PW Distribution System • Provide preliminary performance requirements for the Phase 11 potable water distribution system. • Present the potential impact Phase 11 potable water demands on Phase 1. 6