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20 starting in 2023, and one without the Bay-Delta Plan Amendment. Results of these analyses are summarized as follows:5 • If the Bay-Delta Plan Amendment is implemented, SFPUC will be able to meet its contractual obligations to its wholesale customers as presented in the SFPUC 2020 UWMP in normal years but would experience significant supply shortages in dry years. In single dry years, supply shortages for SFPUC’s wholesale customers collectively, would range from 36 to 46 percent. In multiple dry years for SFPUC’s wholesale customers collectively, supply shortages would range from 36 to 54 percent. Implementation of the Bay- Delta Plan Amendment will require rationing in all single dry and multiple dry years through 2045. • If the Bay-Delta Plan Amendment is not implemented, SFPUC would be able to meet 100 percent of the projected purchases of its wholesale customers during all year types through 2045 except during the fourth and fifth consecutive dry years for base year 2045 when 15 percent wholesale supply shortages are projected. In June 2021, in response to various comments from wholesale customers regarding the reliability of the RWS as described in SFPUC’s 2020 UWMP, the SFPUC provided a memorandum describing SFPUC’s efforts to remedy the potential effects of the Bay-Delta Plan Amendment which include the following:  Pursuing a Tuolumne River Voluntary Agreement  Evaluating the drought planning scenario in light of climate change  Pursuing alternative water supplies  Litigating with the State over the Bay-Delta Plan Amendment  Litigating with the State over the proposed Don Pedro FERC Water Quality Certification 6.1.2 Allocation of RWS Supplies During Supply Shortages The wholesale customers and SFPUC adopted the November 2018 Amended and Restated Water Supply Agreement in 2019, which included a Water Shortage Allocation Plan (WSAP) to allocate water from the RWS to retail and wholesale customers during system-wide shortages of 20 percent or less, including such shortages occurring as a result of implementation of the Bay-Delta Plan Amendment. The WSAP has two tiers which are described below.  The Tier One Plan allocates water between SFPUC and the wholesale customers collectively based on the level of the shortage (up to 20 percent). This plan applies only when SFPUC determines that a system- wide water shortage exists and issues a declaration of a water shortage emergency under California Water Code Section 350. The SFPUC may also opt to request voluntary cutbacks from San Francisco and 5 BAWSCA Drought Allocation Tables by Agency (Table E: Percent Cutback to the Wholesale Customers With Bay-Delta Plan and Table N: Percent Cutback to the Wholesale Customers Without Bay-Delta Plan), dated April 1, 2021. ATTY/RESO.0027/CC RESO WATER SUPPLY ASSESSMENT (920 SHASTA) - EXHIBIT A REV: 04-22-25 VR Page 20 of 42