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River Islands Development at Lathrop January 2021 FINAL River Islands Non-Potable Water Technical Report Rev 2 #6520 3.6 Non-Potable Water Pumping Capacity Requirements— Proposed Phase II NPW Pump Stations River Islands is planning on constructed a future Phase II NPW Pump Station (Phase II NPW PS) to be located along P-Street in Phase II (see Figure 4-2). The pump station will be designed to primarily service Phase II and the remaining Phase I NPW demands. The total PMID for Phase I and II is 9,603 GPM,which leaves a minimum firm pumping deficiency of 7,203 GPM. The design of a single large irrigation pump skid not only limits the demand (flow) range the station can serve, but will also result in unused infrastructure during interim conditions, as River Islands is expected to be completed in 2040. It is recommended that two NPW irrigation pump skids be installed as part Phase II NPW Pump Station. Table 3-4, shows the proposed irrigation pump skids firm pumping capacity and preliminary design recommendations. Based on the full buildout PMID, it is recommended that River Islands consider operating the drip and spray irrigation systems during separate daily and nightly, 8-hour irrigation window respectively, as this will increase the irrigation window and reduce the site wide firm pumping capacity requirements. Table 3-4: Proposed Phase II NPW Pump Stations — Firm Pumping Capacity Pumping Capacity (GPM) @ Motor Rated Pump Number 215 TDH Horsepower Motor Drive Status Phase II —Skid #1 - Irrigation Pump 1,600 150 Variable Frequency Lead #1 Drive Phase II —Skid #1 - Irrigation Pump 1,600 150 Across the Line La #2 Motor Starter g Phase II —Skid #1 - Irrigation Pump 1,600 150 Across the Line Standby #3 Motor Starter Phase II —Skid #1 —Jockey Pump 500 40 Variable Frequency Lead Drive Phase II —Skid #1 — Pressure 75 7.5 Across the Line Lead SustainingPump Motor Starter Skid #1 -Total Firm Pumping 3,775 Capacity Phase II —Skid #2 - Irrigation Pump 1,600 150 Variable Frequency #1 Drive Lead Phase II —Skid #2 - Irrigation Pump 1,600 150 Across the Line #2 Motor Starter Lag Phase II —Skid #2 - Irrigation Pump 1,600 150 Across the Line #3 Motor Starter Standby Variable Frequency Phase 11 —Skid #2—Jockey Pump 500 40 Drive Lead Phase II —Skid #2— Pressure 75 7.5 Across the Line Sustaining Pump Motor Starter Lead Skid #2 -Total Firm Pumping 3,775 Capacity Phase II NPW PS -Total Firm 7,550 Pumping Capacity Notes 1. Firm Pumping Capacity is defined as the pumping capacity of all the pumps minus the capacity of the largest pump(per Appendix H in the City Standards). For the future Phase II NPW PS, it is recommended to provide each skid with a redundant pump as shown considering the number of pumps and size of the main irrigation pumps. 14