Appendix I - Utilities and Service Systems Supporting Information COMBINED

June 2024 2 City of Pleasanton Tract 8569 (Ponderosa Homes) Hydraulic Analysis (ADD) is estimated at 8.1 gallons per minute (gpm), and the maximum day demand (MDD) is estimated at 15.4 gpm (1.90xADD). The development demand summary is documented on Table 2. The fire flow requirement for single-family residences is 1,500 gpm for a duration of 2 hours. 4.0 HYDRAULIC MODELING ANALYSIS The hydraulic analysis utilized the calibrated hydraulic model to evaluate three connection alternatives to the existing system as documented on Figure 1 and summarized as follows: • Alternative 1: Connection to Dublin Canyon Pressure Zone. • Alternative 2: Connection to Dublin Canyon Pressure Zone via a Hydro-Pneumatic Pump Station. • Alternative 3: Connection to the Moller 770 Pressure Zone. The proposed water system pipelines and other recommend infrastructure will be included for each scenario and an analysis will be performed for average day demands (ADD), maximum day demands (MDD), peak hour demands (PHD), and during MDD plus a 1,500 gpm fire flow for 2 hours (MDD+FF). There are 2 lots that will connect separately from the rest of the units and directly to the Dublin Canyon Pressure Zone. Alternative 1 – Dublin Canyon Connection Results: Alternative 1 is a direct connection to the Dublin Canyon Pressure Zone near Dublin Canyon Road and Canyon Meadows Drive as documented on Figure 2. • Average Day Demand Evaluation: Under average day demands, the hydraulic model predicts the Project will experience service pressures of approximately 25 - 88 psi as documented on Figure 2. Most of the lots will be under the pressure design criteria of 40 psi. • Maximum Day Demand Evaluation: Under maximum day demands, the hydraulic model predicts the Project will experience service pressures of approximately 22 ~ 84 psi as documented on Figure 2. Most of the lots will be under the pressure design criteria of 40 psi. • Peak Hour Demand Evaluation: Under peak hour demands, the hydraulic model predicts the Project will experience service pressures of approximately 20 ~ 84 psi as documented on Figure 2. Most of the lots will be under the pressure design criteria of 40 psi. • 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 are unable to supply the 1,500-gpm fire flow requirement. The available fire flows at a pressure greater than 20 psi are documented on Figure 2.