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River Islands Development at Lathrop January 2021 Final River Islands Potable Water Technical Report—Rev 3 #6520 5.4 Steady State Analysis Results— Peak Hour Demands Figure 5-9, Figure 5-10, and Figure 5-11 shows the results of the steady state analysis for each pipe velocities, headloss gradients and the junction and hydrant pressures under PHD. Table 5-4 shows the specific minimum and maximum model results and their corresponding location under PHD. For Phase II, the preliminary pipe sizes were estimated based on the minimum requirements listed in the City's Standards and Water Master Plan. The pipe sizes shown Phase II are recommended to be revisited when Phase II land use plan has been finalized or revised to verify the system's performance. The results of the steady state analysis under PHDs determined that PW supply from SSJID turnout #2 will not be sufficient to instantaneously meet Phase I and II PHD. It is recommended that an extended state analysis be conduct over a couple of days to verify if the tanks can be re-filled during off peak windows utilizing the City's distribution system. Table 5-4: Steady State Analysis Results— Peak Hour Demands City Model Result Category Units Result Requirements Location Minimum Pipe Velocity ft/s 0.01 N/A Several locations, all in tributary areas Maximum Pipe Velocity ft/s 3.28 10 P-1223, 24-inch main in Golden Valley Parkway Minimum Headloss Gradient ft/1000ft 0.01 N/A Several locations, all in tributary areas Several segments of the 24- Maximum Headloss Gradient ft/1000ft 2.5-2.7 N/A inch and 16-inch water lines along Golden Valley Parkway Several Junctions in Phase 1A and 1B of Phase I along Minimum System Pressure psi 58-<60 40 the San Joaquin River and at the location of the Phase 11 High School Junctions along J-7 street Maximum System Pressure psi <67.5-70 80 immediate downstream of the Phase I BPS Flow Supplied' gpm Varies N/A Flow Demand2 gpm 10,372 N/A Peak Hour Demand Flow Stored3 gpm Varies N/A NOTES: 'See Section 5.1 2Flow Demand is equal to the sum of the total potable water demands met. 'See Section 5.1 36