14 ATTACHMENT 1 EXHIBIT A - Laserfiche WebLink

Executive Summary THE CITY OF PL£ASANTON The future reliability of Zone 7's imported water is a concern. Drought, sea level rise, and natural disasters threaten the Sacramento -San Joaquin Delta (Delta), a critical component of the delivery system bringing water to Zone 7. As a result, Zone 7 is participating in various projects that would provide alternate water supplies or protect the existing delivery system against threats. These projects include installing a pipeline system beneath the Delta, desalinating brackish water (water with high salt content), reusing highly treated wastewater, and participating in the construction of a new reservoir to store surplus water in wet years. Based on Zone 7's efforts and the City's continued use of groundwater, the City's future water supplies are expected to keep pace with its water demands. CONSERVATION TARGET COMPLIANCE In its 2015 UWMP, the City achieved its interim water use target and confirmed its 2020 water use target based on 2010 Census data. In 2020, the City achieved its 20 percent reduction target in accordance with SB X7-7. This achievement was the result of continued water conservation by its customers following the recent drought, in addition to the conversion of potable water use for irrigation to recycled water along the recently constructed recycled water distribution system. CITY WATER SERVICE RELIABILITY The California Water Code asks agencies to evaluate their water service reliability by examining the impact of drought on their water supplies and comparing those reduced supplies to water demands. Specifically, agencies should calculate their water supplies during a single dry year and five consecutive dry years using historical records. For example, the City can estimate its groundwater supply during a single dry year by looking at how much it pumped during the driest year on record. If that historical "dry year" amount was reduced by 10 percent, then the City can conservatively assume a similar 10 percent reduction in groundwater supplies in a future dry year. The City is well-positioned to withstand the effects of a single dry year and a five-year drought. The City's drought risk was specifically assessed between 2021 and 2025, assuming that the next five years are dry years. Based on Zone 7's ability to meet all its water demands during dry conditions, the City is expected to have enough water supplies to meet water demands for a five-year drought beginning in 2021. This remains true for five-year droughts beginning in 2025, 2030, 2035, 2040, and 2045. WATER SHORTAGE CONTINGENCY PLAN A WSCP describes an agency's plan for preparing for and responding to water shortages. The City updated its WSCP to include its process for assessing potential gaps between planned water supply and demands for the current year and the next potentially dry year. The City aligned its water shortage levels with the State for consistent messaging and planned for locally appropriate water shortage responses. The WSCP may be used for foreseeable and unforeseeable events and is adopted concurrently with this UWMP by separate resolution to allow for updates as conditions change. WEST YOST ES -3 City of Pleasanton 2020 Urban Water Management Plan May 2021