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140 The reliability of the SFPUC RWS supply is highly dependent on whether the 2018 Bay-Delta Plan Amendment is implemented. The implementation of the Bay-Delta Plan Amendment significantly impacts the SFPUC RWS supply reliability in dry years; however, the actual implementation of the Bay-Delta Plan Amendment is uncertain. The draft WSA therefore presents findings for two water supply reliability scenarios, one assuming the Bay-Delta Plan Amendment is implemented and one assuming that the Bay-Delta Plan Amendment is not implemented. As noted in the draft 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. For this reason, the WSA states the analysis of the Bay-Delta Plan Amendment included in the report represents a worst-case scenario that is unlikely to come to fruition but is included for informational purposes. Under both scenarios, the total projected water supplies available for the proposed project in normal years would meet the projected water demand associated with the proposed project, in addition to the City’s existing and planned future uses through 2045. Supply shortfalls are projected during single dry years and multiple dry years for both scenarios; projected supply shortfalls would be more severe if the Bay-Delta Plan Amendment is implemented. If supply shortfalls do occur, the City expects to meet these supply shortfalls through water demand reductions and other shortage response actions by implementation of its Water Shortage Contingency Plan (WSCP), which was adopted on June 14, 2021. For these reasons, the draft WSA concludes there would be sufficient water supply to serve the proposed Project (Commercial Component and Housing Component). For the purposes of this consistency checklist, the conclusions of the WSA regarding water supply availability and reliability indicate the proposed Project would not generate new or more severe water supply impacts beyond those analyzed in the DTPP program EIR and the DTPP Plan-Wide Amendments program SEIR, and there is no new information of substantial importance for CEQA purposes. As a result of DTPP standards, Mitigation Measure UT-2, and the City requirements described above, the proposed Commercial Component would not generate new or more severe water supply impacts beyond those analyzed in the DTPP program EIR and the DTPP Plan-Wide Amendments program SEIR, and there is no new information of substantial importance for CEQA purposes. c. The DTPP program EIR (pp. 10-15 and 10-16) concluded that the South Bayside System Authority (SBSA)29 wastewater treatment plant would not be significantly impacted by development allowed under the DTPP, which includes the proposed Commercial Component. Development occurring as a result of the proposed DTPP Plan-Wide Amendments would be required to comply with the CALGreen Code’s water conservation and efficiency standard, the implementation of which would minimize the wastewater generated (pp. 10-36 – 10-37). For this and other reasons, the DTPP Plan-Wide Amendments program SEIR concluded the proposed DTPP Plan-Wide Amendments’ estimated wastewater generation would be adequately served by the SVCW wastewater treatment plan because the addition of the estimated wastewater generated from 830 residential units and 1,167,100 square feet of office uses as a result of the proposed DTPP Plan-Wide Amendments [including the Commercial Component] would represent less than two percent of the excess average daily capacity (15-17 million gpd) of the wastewater treatment plant. There is sufficient capacity to treat this additional wastewater. As of 2022, the SVCW’s treatment plant has a permitted dry weather capacity of 29 million gpd and a peak wet weather flow capacity of 71 million gpd. The treatment plant’s average daily flow in 2022 was 12-14 million gpd. Thus the SWCVW plant is typically using 20 to 48% of its capacity. Existing average daily wastewater flow for the site is 2,532 gpd. Based on City engineering factors used to calculate projected wastewater generation (95 percent of water demand – see [b] above, and Attachment 3 in the Preliminary Engineering Study, December 14, 2024), the Commercial Component’s projected average daily wastewater flow would be 72,464 gpd. The net wastewater generation for the Commercial Component is forecast at 69,932 gpd (72,464 – 2,532). As summarized above, the DTPP Plan-Wide Amendments program SEIR concluded development as a result of the DTPP Plan-Wide Amendments program SEIR would represent less than two percent of the average daily capacity of the wastewater treatment plant. The Commercial Component’s proposed uses and density were included in the DTPP Plan-Wide Amendment program SEIR’s development projections used to determine the Plan-Wide Amendment’s estimated wastewater generation. The Commercial Component’s proposal to construct approximately 305,225 SF of commercial space (primarily life-science research and development space or “R&D”) and an approximately 6,450 SF teen center/multi-purpose space does not exceed the 1,167,100 square feet development cap analyzed in the DTPP Plan-Wide Amendments program SEIR and would be comparable to what was analyzed in the SEIR. The Commercial 29As noted in the Focused GPU EIR, what was formerly known as the South Bayside System Authority is now called “Silicon Valley Clean Water.” ATTY/RESO.0031/CC RESO CEQA GUIDELINES (901 EL CAMINO REAL) REV: 04-22-25 VR Page 140 of 148