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3 Executive Summary Overview Redwood City is reviewing an application for a mixed-use development planned in Redwood City which includes a commercial office/research and development space at 901 El Camino Real multi-family residential apartments at 920 Shasta Street. The project meets the requirements for the preparation of a water supply assessment. Projected Water Demands The projected water demands for the Proposed Project, which will be located within the City’s potable and recycled water service area, were estimated using Attachment Q of Volume III (Design Criteria) of Redwood City’s 2019 Engineering Standards. The projected water demand associated with the Proposed Project is 35.9 acre-feet per year (AFY) of potable water and 68.1 AFY of recycled water. According to Redwood City’s Municipal Code Section 38.52, all new commercial and multi-family residential properties located within the recycled water service area must be dual plumbed to provide for internal use of recycled water and must use recycled water for landscape irrigation. Since Attachment Q does not differentiate between potable and recycled water uses, the indoor potable/recycled water ratios for the Proposed Project were assumed to be consistent with the ratios used in the City’s 2020 Urban Water Management Plan (UWMP). The UWMP assumed, based on historical meter readings for existing dual plumbed projects, that future development within the City’s Recycled Water Service Area would allocate indoor water use at a ratio of 20 percent potable/80 percent recycled for office and R&D uses. In addition, all landscaping water demand projected for the commercial component of the Proposed Project is assumed to be supplied by recycled water, based upon the requirements of Municipal Code Section 38.52. Based on population and employment projections in the City’s 2020 UWMP, the projected water demand for the Proposed Project is included in the UWMP water demand projections. The Proposed Project, if approved, would be required to undertake certain improvements to utilities, including installation of new recycled water supply main(s) to serve the commercial component. It is anticipated that the new main(s) would extend from the closest existing or planned extension of the City’s recycled water system to serve the project. Summaries of the availability and reliability of potable water supplies to serve the projected water demands for the Proposed Project are discussed below. Water Supply Availability and Reliability As discussed in this WSA, the City purchases all its potable water supplies from the San Francisco Regional Water System (RWS), which is operated by the San Francisco Public Utilities Commission (SFPUC). The City is a Wholesale Customer of the SFPUC. The availability and reliability of the City’s water supplies, as described in this WSA, are based primarily on information contained in the City’s 2020 UWMP and the SFPUC 2020 UWMP. The demand projections in the City’s 2020 UWMP included 36% of the projected water demand to accommodate the Proposed Project which is incorporated by reference into this WSA. ATTY/RESO.0027/CC RESO WATER SUPPLY ASSESSMENT (920 SHASTA) - EXHIBIT A REV: 04-22-25 VR Page 3 of 42