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<br />7A - ATTACHMENT NO.3 <br />Saltworks Proposal- Water Group Summary Report (22 January 2010) Page 2 <br /> <br />Executive Summary <br /> <br />This report evaluates the water demand and supply components of the Saltworks 50/50 <br />Balanced Plan (proposal) submitted by OMB Redwood City Saltworks (OMB). This report was <br />prepared by water demand and supply experts retained by Hart Howerton, Ltd. pursuant to its <br />September 2009 contract with the City of Redwood City (City). The purpose of the evaluation is <br />to identify the OMB proposal's water demand and supply assumptions regarding volumes, use, <br />feasibility, and sustainability. The objective is to identify water demand and supply components <br />about which the report authors conclude: <br /> <br />· Could not be attained or implemented and, which if not attained or implemented, <br />would render the project infeasible such that further analysis is unwarranted; or <br /> <br />· Represent policy issues or project implementation uncertainties that merit further <br />evaluation in the scoping and/or environmental impact assessment phase of project <br />evaluation. <br /> <br />The water team concludes that the Saltworks project has feasible options for potable and non- <br />potable water supply that meet or exceed the project's demand. Key findings are as follows: <br /> <br />Demand <br /> <br />· The OMB Demand Report shows a potable water demand of 1,080 Acre-Feet Per Year <br />(AFY) and a non-potable water demand of 1,430 AFY for a total demand of 2,510 AFY. <br />The demand projection methods of the OMB analysis assume highly efficient fixtures, <br />precise installation and ongoing regulatory oversight to sustain the initial efficiency. <br /> <br />· The water team carried out a demand projection based on the land uses, units, and <br />square footage values from the OMB Demand Report, but using a method based on the <br />City's Attachment a (calculation methodology - aka "A-a"). This projection shows a <br />potable demand of 1,815 AFY and a non-potable water demand of 1,825 AFY for a total <br />demand of 3,640 AFY. <br /> <br />SUDDlv <br /> <br />· SFPUC supply - The City's current Supply Assurance from the SFPUC is 12,243 AFY. <br />The City's 2005 Urban Water Management Plan (UWMP) projects that in 2030, the City <br />will use 11,724 AFY from the SFPUC, which is 519 AFY less than the Supply <br />Assurance. The 2030 projection of 11,724 AFY does not include the Saltworks project. <br />The 519 AFY may be available for a project like the Saltworks. The UWMP is scheduled <br />to be updated in 2010-2011 to be consistent with a new General Plan (approval <br />anticipated in 2010). The new General Plan may include demands that are not included <br />in the 2005 UWMP and which could exceed City's current SFPUC Supply Assurance of <br />12,243 AFY. <br /> <br />· Recycled water - The City's recycled water project has capacity to serve the 1,825 AFY <br />that the Saltworks project would require based on the Attachment a methodology. <br /> <br />· Groundwater - OMB identified groundwater as the source of 700 AFY, and sUbsequently <br />revised the water supply proposaJ so that groundwater is no longer a planned supply <br /> <br />ES-1 <br />