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6.1E Page 5 CITY OF REDWOOD CITY PUBLIC WORKS SERVICES DEPARTMENT WATER SUPPLY ASSESSMENT For the proposed Stanford in Redwood City Project June 1, 2009 1. OVERVIEW On November 6, 2008, the City of Redwood City (City) Public Works Services Department received a request from the Community Development Services Department to prepare a Water Supply Assessment (WSA) for the proposed Stanford in Redwood City Project (Project). This WSA is presented to the Redwood City Council for its consideration at its regularly scheduled meeting on July 13, 2009. Water Use Characteristics City staff and Project engineers used the City's Engineering Standards for Water System Design Criteria (known as "Attachment a") to develop initial demand estimates for the Stanford in Redwood City Project. These demand estimates are listed in Attachment 2 as Table 3A, 3B, and 3C and are summarized below: 100% Potable Water Indoor and Outdoor Use - Table 3A includes a potable water requirement of 264.4 acre-feet per year (af/yr). However, because the site currently has an existing water use of about 57.2 af/yr, the net increase in potable water use for the Project is estimated to be 207.2 af/yr. 100% Potable Indoor Use and 100% Recycled Outdoor Use - Table 3B includes a potable water requirement of 212.2 af/yr and a recycled water requirement of 52.2 af/yr. Given that the site currently has existing potable water use of about 57.2 af/yr, the net increase in potable water use for the Project is estimated to be 155 af/yr. Mixed Potable / Recycled Indoor Use and 100% Recycled Outdoor Use - Table 3C includes a potable water requirement of 123 af/yr and a recycled water requirement of 141.4 at/yr. Given that the site currently has existing potable water use of about 57.2 af/yr, the net increase in potable water use for the Project is estimated to be 65.8 at/yr. This WSA has been developed to determine if the City has sufficient water to meet the expected future water demands of the Project together with those of existing customers and planned future development. As shown in the City's 2005 Urban Water Management Plan (UWMP), City-wide demand for potable water is projected to be 11,724 af/yr in the year 2030. This figure includes growth in demand that is projected to occur between 2000 and 2030. The UWMP projects that between 2000 and 2030, there will be 487 af/yr in new indoor water demand and 233 af/yr in new outdoor water demand in the commercial sector. The UWMP does not specifically identify particular sites or projects where growth will occur; nor does the UWMP identify growth in terms of square footage of development. Instead, the growth projections in the UWMP are based on broad. City-wide population projections. The Page 2 of 11