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7. B. - Page 10 Executive Summary 1! GlIY qW `wflj(RG 9 6 e WJft LCr&d ES.6 KEY TECHNICAL FINDINGS (CHAPTERS 5,6 AND 7) In summary, the technical evaluations identified the following key findings: • System Capacity and Operational Evaluation: While the City's existing distribution system storage is adequate for normal operational needs, there is a need for additional storage in both the Hillside Area and the Main City Zone to meet emergency and fire flow needs. Thus, the City's highest priority capacity projects are new storage projects to address fire flow and emergency needs in the Hillside Area and Main City Zone. • Seismic Vulnerability Assessment: The City's tank and pump station facilities are at risk from seismic events due to the City's proximity to the San Andreas Fault. A number of existing seismic vulnerabilities can be addressed through relatively low capital expenditures. Of the City's 12 tanks, three will need major rehabilitation to address seismic vulnerabilities, and three tanks will require eventual replacement. These projects are included in the Pipeline and Facility Renewal and Replacement Program. • Pipeline and Facility Renewal and Replacement: The City has aging, but generally well maintained infrastructure. Pipeline replacements should, at a minimum, continue at existing rates. However, an increased replacement schedule is recommended to improve risk management. To address aging tank and pump station facilities, the City should continue its tank and pump station rehabilitation program and plan for longer - term replacement of tanks. These findings are discussed in greater detail below. ES.6.1 System Capacity and Operational Reliability Assessment The system analysis evaluated facilities and pipeline performance, assessing system now and pressure for normal and emergency operations, and system redundancy and reliability. The analysis evaluated the existing system under both current demands and 2030 demands. A computerized, calibrated hydraulic model of the City water distribution system was developed from the City's GIS for the technical evaluation. Three programs (Capacity and Operational (CAP) -1, 2 and 3) were formulated to address existing system needs, and one program (CAP -FU) was developed to address needs for future growth. Table ES -2 summarizes key programs developed for the System CAP Evaluation: WEST Y O S T ASSOCIATES ES-6 City of Redwood City September 2011 Water System Master Plan o \c \369 \06- 09- 01 \wp \mp \052610_OES