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9 must be dual plumbed to provide for internal use of recycled water and must also use recycled water for any landscape irrigation. Both components of the Proposed Project will be located within the City’s recycled water service area and so they both must conform to the recycled water requirements. Since Attachment Q does not differentiate between potable and recycled water uses, the indoor potable/recycled water ratios for the Project were assumed to be consistent with the ratios used in the City’s 2020 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 and 70 percent potable/30 percent recycled for residential uses when recycled water is available for use.4 All landscaping water demand projected for the commercial component of the proposed project is assumed to be supplied by recycled water, to adhere to the City’s Municipal Code, as discussed above. R&D Laboratory uses demand more water than a typical office use. The estimated water demand associated with the Proposed Project is presented in Table 2-1 below. Table 2-1. Estimated Water Demand for the Proposed Project Land Use Quantity Quantity Units Estimated Water Demand, AFY(a),(b) Potable(c) Recycled(c) Total Existing New Potable MF Residential 100 DU 14.8 0.0 14.8 0.2 14.6 Office/R&D 311,860 sqft 16.9 67.6 84.5 3.0 13.9 Irrigation 7,130 sqft 4.2 0.6 4.8 0.7 3.5 Total 35.9 68.1 104.0 4.0 31.9 (a) Total includes the water demand of the proposed project. Existing includes the potable water demand for the proposed project location(s). New Potable is the estimated potable demand for the project less existing demand. (b) Indoor and landscaping demands were estimated using Attachment Q of Volume III of Redwood City's 2019 Engineering Standards (Appendix A). Includes: Office/R&D 305,225 sqft and 323 persons for teen center. (c) The indoor potable/recycled water ratio is assumed to be 20/80 for office space and R&D Laboratory. All landscaping for the commercial component of the project is assumed to be supplied by recycled water. R&D = research and development; sqft = square feet; DU = dwelling unit; AFY = acre-feet per year; MF = Multi-Family The development anticipated from the Project would require 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 areas. 4 Documentation concerning recycled water demand assumptions include: Kennedy/Jenks Consultants, Water Recycling Feasibility Study for Redwood City, August 7, 2002, and Final Water Recycling Feasibility Update, prepared for the City of Redwood City, September 11, 2012; City of Redwood City, 2019 Engineering Standards, Volume III, Part XIII; City of Redwood City, 2019 Recycled Water Development Standards; and Redwood City Urban Water Management Plan. ATTY/RESO.0027/CC RESO WATER SUPPLY ASSESSMENT (920 SHASTA) - EXHIBIT A REV: 04-22-25 VR Page 9 of 42