RES 2025008 - Laserfiche WebLink

1. Specific Plan Water System Concept The City will provide water for all uses , except the irrigation of vineyards and other agricultural activities. Distribution facilities must satisfy minimum design criteria as specified in the "Hillside Water Pressure Zone Master Plan" and be constructed to the specifications of the Public Works Department. The following is a summary of special considerations which must be addressed in providing water service within the Plan Area. a. Water Pressure Water connections at different elevations will require different strategies to meet established pressure criteria . The majority of the connections will fall within the normal elevation boundaries of the City's Bonde Zone (390 to 540 feet). It is possible to serve water connections within this range by integrating into the Bonde Zone and providing additional storage and pumping facilities. The Plan Area has been divided into four elevation bands, as shown in Figure VI-2 . Each band has different service considerations . Starting from the lowest elevation band, the methods needed to meet the water pressure criteria are as follows: • Below Elevation 390: The normal lower service level boundary of the Bonde Zone is 390 feet. A portion of Lot 18 located along the north edge of the Plan Area adjoining the Arroyo del Valle is situated as much as seven feet below this boundary . Localized pressure could approach 120 pounds per square inch (psi), but would not exceed the 125 psi maximum allowable limit. A majority of the affected area is designated on the land use plan (Figure IV-2) for Vineyard use. However a limited number of residential units may be affected . Pressure concerns for these homes shall be mitigated by requiring the installation of pressure reduc ing valves (PRV's) for all connections . Current City standards requ ire the use of this equipment in all situations where localized water pressu re is above 80 psi. • Between Elevation 390 and 475: Service connections within this band will also experience pressures exceeding 80 psi , and will therefore require the installation of PRV's . • Between Elevation 475 and 540 : No special water pressure measures will be needed to serve the planned and existing homes located within this band . 75