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28 demand reductions and other shortage response actions by implementation of its WSCP.8 Consistent with California Water Code (CWC) §10632, the WSCP includes six levels to address shortage conditions ranging from up to 5 percent to greater than 55 percent shortage, identifies a suite of demand mitigation measures for the City to implement at each level, and identifies procedures for the City to annually assess whether or not a water shortage is likely to occur in the coming year, among other things. With implementation of the Bay-Delta Plan Amendment, the projected single dry year shortfalls (of 32 to 40 percent) would require implementation of Stage 4 or 5 of the City’s WSCP, which, according to Chapter 8 of the UWMP, will reduce the shortage gap by 35 or 45, respectively. The projected multiple dry year shortfalls (of (of 32 and 47 percent) would require implementation of Stage 4, 5 or 6 of the City’s WSCP, which will reduce the shortage gap by up to 55 percent. Each stage of the City’s WSCP requires declaration by the City Council once a governing body, such as SFPUC, has required a voluntary or mandatory reduction in water use due to water supply shortages or an emergency. Each stage includes implementation of a mandatory water allocation program, voluntary restrictions on end uses, as well as various agency actions. The water saving impacts associated with each stage of action of the WSCP (Stages 1 through 6) are quantitatively estimated using the Drought Response Tool (DRT), as presented in Attachment 2 of the City’s WSCP, provided in Chapter 8 of the City’s 2020 UWMP. The DRT quantitative assessment considers each consumption reduction method independently to quantify water savings for Stages 1 through 6 of the City’s WSCP. As described in Section 6.1.3 of this WSA, the SFPUC is implementing an Alternative Water Supply Planning Program to investigate and plan for new water supplies to address future long-term water supply reliability challenges and vulnerabilities on the RWS. Also, as described in Section 5.3 of this WSA, the City is currently in the early stage of evaluating groundwater as a potential back-up supply. However, because these potential additional supplies are still being developed, they are not included in Table 7-1. Table 7-3 summarizes the scenario where it is assumed the Bay-Delta Plan Amendment is not implemented. Under this scenario, the total projected water supplies determined to be available in single dry years and multiple dry years are only slightly lower than the projected water demand associated with the City’s existing and planned future uses, including the Proposed Project, through 2045.9 These projected supply shortfalls are significantly less than the projected supply shortfalls if the Bay-Delta Plan Amendment is implemented. This includes both single dry years (shortfalls ranging from 1 to 2 percent) and multiple dry years (shortfalls ranging 8 A main focus of the City’s planned demand reduction measures is to increase public outreach and keep customers informed of the water shortage emergency and actions they can take to reduce consumption. Other actions that the City will take include coordination with other agencies, implementing water rate incentives and penalties, increasing water waste patrols, etc. Additional information on the City’s WSCP is provided in Chapter 8 of the City’s 2020 UWMP. 9 Although Tables 7-3 and 7-4 show shortfalls under all dry year scenarios, SFPUC’s analysis only projects supply shortfalls for Redwood City during the fourth and fifth consecutive dry years for base year 2045 for the scenario without implementation of the Bay-Delta Plan Amendment. This difference is due to variations between the projected purchases (demands) for Redwood City that are used in SFPUC’s analysis, and the demands projected in Redwood City’s 2020 UWMP. The analysis in this WSA is consistent with the demands projected in Redwood City’s 2020 UWMP. ATTY/RESO.0030/CC RESO WATER SUPPLY ASSESSMENT (901 EL CAMINO REAL) - EXHIBIT A REV: 04-22-25 VR Page 28 of 42