RES 2026043 - Laserfiche WebLink

City of Pleasanton I Water Shortage Contingency Plan EV\TON an emergency, the City has two interties with DSRSD and one intertie with Livermore. Per agreements with DSRSD and Livermore made in 1996 and 2011, respectively,the City can receive from each agency a reasonable quantity of water required during the emergency. The City has mutual aid agreements with the San Francisco Public Utilities Commission (SFPUC), Livermore, DSRSD, and Zone 7. The City also participates in the Water/Wastewater Agency Response Network (WARN), a statewide public utility mutual assistance organization. After exhausting its own resources,the City can call on these neighboring agencies for aid. 4.5.1 Interrupted Supply from Zone 7 If imported deliveries are interrupted,the City will coordinate with Zone 7 on available groundwater and stored supplies and implement applicable shortage stage actions immediately. Zone 7 has emergency generators (both portable and dedicated) at strategic locations in preparation for a regional power outage.These generators would allow both the Del Valle Water Treatment Plant and the Patterson Pass Water Treatment Plant to continue operating even under a power outage. Assuming no interruptions in surface water supply, Zone 7 would be able to provide continued service to all treated water contractors. If necessary to meet demand, Zone 7 would also operate groundwater wells, which have either a dedicated generator in place or have the necessary hook-ups to receive power from a portable generator. If the power failure were to occur during the high-demand summer season, Zone 7 may be unable to meet hourly peak demands throughout the transmission system. Zone 7 would work closely with the City and other retailers to manage demands to minimize impacts. 4.5.1.1 Unavailable SWP Water Zone 7, and therefore Pleasanton, relies heavily on the SWP for water supply. If SWP supplies are unavailable, the City will rely on available alternative deliveries and groundwater, evaluate projected deficits, and escalate stage actions as needed. Under this scenario and under current conditions, Zone 7 estimates that it would be able to make full deliveries to the retailers during non-summer months using a combination of groundwater and water stored in Lake Del Valle. During the peak demand of the summer months, however, Zone 7 will need to reduce deliveries to its retailers, including the City. Zone 7's analysis shows that Zone 7 has sufficient groundwater supply and pumping ability to serve the indoor water use needs of the service area over a one-year period; the availability of water supply for outdoor water use during the summer months will depend on the amount of water available in Lake Del Valle. Depending on timing and degree of recovery, the City may activate one of the water shortage levels in Section 3. 4.5.1.2 Unavailable Zone 7 Water If one or more Zone 7 turnouts are unusable, the City will reroute available supplies where feasible and prioritize service reliability while implementing shortage response measures. 4.5.2 Area-Wide Electrical Power Failure During prolonged power outages, the City will rely on backup power and emergency operations where available, prioritize critical facilities, and maintain shortage response messaging. Additionally, the City could receive water from emergency interties with DSRSD and Livermore if necessary. 4.6 Seismic Risk Assessment and Mitigation Plan CWC §10632.5(a) requires that UWMPs assess seismic risk and include a mitigation plan for the water system's seismic vulnerabilities and allows for incorporating a Local Hazard Mitigation Plan (LHMP) to meet this requirement, if the LHMP addresses seismic risk. Along with DSRSD and the cities of Dublin and ( environment Public Draft May 2026 &watoer 13 EKI Environment&Water, Inc.