Appendix I - Utilities and Service Systems Supporting Information COMBINED

June 2024 5 City of Pleasanton Tract 8569 (Ponderosa Homes) Hydraulic Analysis Pressure Zone has a surplus of 0.12 MG and can accommodate Tract 8569 storage requirement as documented on Table 3. Alternative 3 – Moller 770 Storage Impacts: The current fire flow storage requirement in the Moller 770 Pressure Zone is 0.24 MG (2,000 gpm x 2 hrs), which is larger than the Tract 8569 requirement, therefore no additional fire storage is required for the Project resulting with a total storage requirement of 0.017 MG. The Moller Pressure Zone has a surplus of 0.29 MG and can accommodate Tract 8569 storage requirement as documented on Table 3. 6.0 PUMP STATION IMPACTS The pumping requirement criteria is 150% of the maximum day demand. This results in a pumping requirement of 23 gpm for Tract 8569. Alternative 1 and 2 – Dublin Canyon Pump Station Impacts: The Dublin Canyon Pressure Zone has a surplus of 990 gpm and can accommodate the Tract 8569 pumping requirement as documented on Table 4. Alternative 3 – Moller 770 Storage Pump Station Impacts: The Moller 770 Pressure Zone has a surplus of 230 gpm and can accommodate the Tract 8569 pumping requirement as documented on Table 4. 7.0 ANALYSIS SUMMARY The hydraulic analysis evaluated the existing and proposed pipelines to verify the distribution mains and service pressures were within the City’s performance and design criteria. Hydraulic Analysis Summary: The hydraulic analysis indicates the following: • Alternative 1: The Dublin Canyon Pressure Zone does not maintain a high enough hydraulic grade so pressures and available fire flows in the Project will be under criteria (Figure 2). • Alternative 2: Tract 8569 will require a hydro-pneumatic pump station connected to the Dublin Canyon Pressure Zone to maintain the required pressures and fire flows in the project (Figure 3). The proposed hydro-pneumatic pump station will require a firm capacity of 26 gpm (1 duty + 1 standby pump) to supply the domestic water demands and a 1,500 gpm fire flow pump. • Alternative 3: Connecting Tract 8569 to the Moller 770 Pressure Zone will require approximately 2,450 feet of 10-inch pipeline in the Laurel Creek Emergency Vehicle Access Road connecting to the existing 12-inch main in Crosby Drive to supply the project (Figure 4). Additionally, due to the steep terrain and potential for soil creep, it is recommended that a fully restrained pipeline be utilized.