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River Islands Development at Lathrop January 2021 Final River Islands Potable Water Technical Report—Rev 3 #6520 Table 4-3: SSJID PW Storage and Transfer Pump Station at River Islands (Site A) — Firm Pumping Capacity Pumping Capacity (gpm) @ 30' Motor Rated Pump Number TDH Horsepower Motor Drive Status Across the SSJID Transfer Pump#1 2,000 25 Line Motor Duty Starter Across the SSJID Transfer Pump#2 2,000 25 Line Motor Duty Starter Across the SSJID Transfer Pump#3 2,000 25 Line Motor Standby Starter Total Firm Pumping Capacity' 4,000 Notes 1. Total Firm Pumping Capacity excludes Standby Pump#3 4.2.2.2 Hydraulic Model Assumptions—Steady State Analysis • 12— inch sleeve valve For the purposes of the hydraulic model, the 12-inch sleeve valve is set to open when the water level in the surge tank reaches an elevation of 20 feet (4 feet from the FF of the tank) and close at an elevation of 40 feet which is the invert elevation of the tank's inlet. • 1.0 MG SSJID Surge Tank Starting Water Level For the purposes of a steady state hydraulic analysis, the SSJID surge tank is to start full, with a water level elevation of 39 feet (just below the invert elevation of the tank's inlet). • SSJID Transfer Pumps The transfer pumps are designed to turn on or off based on low and high level set points in Phase BPS 1.5 MG Tank#1. Both the 2,000 GPM pumps will turn on and operate at 100% speed when the water level in Tank#1 reaches an elevation 20 feet(4 feet from FF)and turn off at an elevation of 39 feet which is the invert elevation of the tank's inlet. • 24-inch bypass Site A does not have enough capacity to handle peak hour demand at full buildout conditions. When the water level in the Phase I BPS storage tanks reaches a low low water level elevation of 19 feet (3 feet from FF), a 24-inch electric actuated valve, upstream of the 12-inch sleeve valve, will open allowing flow from SSJID turnout#2 to flow directly to Phase I BPS storage tanks. 4.2.3 Sources of Distribution Pressure and Storage — Phase I City of Lathrop Potable Water Storage and Pump Station at River Islands (Phase I BPS) The River Islands area of the City's PW distribution system is/will continue to be designed to be pressurized from the Phase I and the proposed Phase II BPS located within the development. Each of these booster pump stations will pump stored, on-site PW out to the distribution system based on maintaining a set pressure range in the system. Other booster pump stations in the City have the ability to pressurize the 21