Appendix I - Utilities and Service Systems Supporting Information COMBINED

June 2024 3 City of Pleasanton Tract 8569 (Ponderosa Homes) Hydraulic Analysis • Pipeline Velocities: The maximum pipeline velocities predicted during peak hour demands are also documented on Figure 2. The proposed 8-inch mains are under the pipeline criteria of 10 fps during PHDs with a maximum velocity of approximately 0.1 fps. The Dublin Canyon Pressure Zone is unable to provide sufficient service pressures and fire flow protection due to the elevation gain of the project. Alternative 2 – Dublin Canyon Connection + Hydro-Pneumatic Pump Station Results: Alternative 2 is a connection to the Dublin Canyon Pressure Zone near Dublin Canon Road and Canyon Meadows Drive with a hydro-pneumatic pump station to supply the domestic water demand and fire flow as documented on Figure 3. • Average Day Demand Evaluation: Under average day demands, the hydraulic model predicts the Project will experience service pressures of approximately 50 - 88 psi as documented on Figure 3. • Maximum Day Demand Evaluation: Under maximum day demands, the hydraulic model predicts the Project will experience service pressures of approximately 45 ~ 84 psi as documented on Figure 3. • Peak Hour Demand Evaluation: Under peak hour demands, the hydraulic model predicts the Project will experience service pressures of approximately 40 ~ 84 psi as documented on Figure 3. • Maximum Day Demand plus Fire Flow Evaluation: The fire flow analysis consisted of using the MDD in the hydraulic model and applying hypothetical fire flows. The analysis indicates that the proposed hydrant locations and pipelines can supply the 1,500-gpm fire flow requirement. The available fire flows at a pressure greater than 20 psi are documented on Figure 3. • Pipeline Velocities: The maximum pipeline velocities predicted during peak hour demands are also documented on Figure 3. The proposed 8-inch mains are under the pipeline criteria of 10 fps during PHDs with a maximum velocity of approximately 0.1 fps. 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 – Moller 770 Connection Results: Alternative 3 is a connection to the Moller 770 Pressure Zone via a new 10-inch pipeline in the Laurel Creek Emergency Vehicle Access Road and connecting to the existing system in Crosby Drive as documented on Figure 4.