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River Islands Development at Lathrop January 2021 Final River Islands Potable Water Technical Report—Rev 3 #6520 5 River Islands Potable Water Distribution Model - Results 5.1 Steady State Analysis Results—Average Day Demands Figure 5-2, Figure 5-3, and Figure 5-4 shows the steady state analysis results of each pipe velocities(feet per second (ft/s)), headloss gradients (in feet of headloss per every 1000-feet) and the junction pressures (in psi) under ADD. Table 5-1 shows the specific minimum and maximum values for the model and their corresponding location under ADD. As described in Section 4.2.2,the modeling of the City's potable water supply sources is beyond the scope of work of this report, as an extended state model situation with diurnal demand curves and specific operating parameters from the City's maintenance team would be required. Table 5-1: Steady State Analysis Results—Average Day Demands City Model Result Category Unit Result Requirements Location Minimum Pipe Velocity ft/s 0.01 N/A Several locations Maximum Pipe Velocity ft/s 1.68 10 P-1223, 24-inch main along Golden Valley Parkway Several locations, all lines except for the 24-inch line along Golden Minimum Headloss Gradient ft/1000ft 0.01 N/A Valley Parkway and a portion of the 12-inch line in Somerton Parkway P-1223, a pipe segment of the 24- Maximum Headloss Gradient ft/1000ft 0.75 N/A inch main along Golden Valley Parkway Approximately 2 junctions located Minimum System Pressure psi 60 40 in east of Phase 1A and 1 B along the San Joaquin River. Maximum System Pressure psi 71-70 80 Several locations, primarily in the larger transmission type lines. Flow Supplied' GPM Varies N/A Flow Demand2 GPM 3,051 N/A Average Day Demand Flow Stored3 GPM Varies N/A NOTES: 'Flow supplied is the total flow supplied from either the SSJID connection(SSJID turnout#2)or the City PW Distribution System. 2FIow Demand is equal to the sum of the total potable water demands met. 'Flow Stored is equal to the total net flow rate of water stored in the River Islands storage tanks and is dependent on an extended state model situation to fill the tanks. 26