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<br />Seismic Vulnerability Study <br /> <br />(at no cost) to its clients for subsequent use (client bears all responsibility). SERA <br />is licensed and used for large utilities like: Pacific Gas and Electric; East Bay <br />Municipal Utility District; Bonneville Power Administration; San Diego Water <br />Department. The benefits of using SERA are that nearly instant analyses can be <br />made for the Redwood City water system for any earthquake; near-real time post- <br />earthquake analyses can be performed using USGS-supplied ShakeMaps, and the <br />automatic generation of maps. Should Redwood City be interested in SERA, we <br />can provide a demonstration. The additional effort to load SERA with Redwood <br />City customized data (all pipelines, tanks and pump stations) is estimated at 40 <br />manhours (assuming a good GIS dataset to begin with); user manual and one <br />training session for Redwood City at 24 hours (64 hours total); should Redwood <br />City wish to have SERA, then a suitable task and licensing agreement will be put <br />in place. <br /> <br />· We will also address the seismic reliability of the PG&E power supply. Note: <br />G&E has performed detailed models of the PG&E high voltage network serving <br />Redwood City, and has detailed information about the performance of every high <br />voltage substation in and near Redwood City. <br /> <br />· We will factor in the latest information about the concurrent performance of the <br />SFPUC system (BDPL 1,2,3,4 and future 5) as it affects each turnout into the <br />Redwood City system. G&E is the lead designer for the new BDPL 5; performed <br />the site selection for new valves in BDPL 3 and 4 (done particularly to enhance <br />seismic reliability for Redwood City); has done interior inspections for BDPL 3 <br />and 4 to assess their current conditions; has done detailed seismic evaluations of <br />BDPL 1 and 2 where they cross the SF Bay through the Dumbarton Crossing. We <br />will also factor in the concurrent performance of every water agency adjacent to <br />Redwood City (Cal Water Bear Gulch / Atherton; Menlo Park; Belmont; San <br />Carlos), so that post-earthquake sharing of water between the agencies via <br />emergency connections can be made. G&E has performed seismic vulnerability <br />evaluations for all these water agencies, including assessment of everyone of <br />their tanks, reservoirs, pump stations, pipelines, and emergency response <br />capability . <br /> <br />· We will prepare a Tech Memo (2) that presents all findings. This will include a <br />series of tables that outline the performance of each Redwood City facility (tank, <br />pump station, individual pipeline) under various PGA levels and versus various <br />code acceptance levels; performance of all pipelines in Redwood City; water <br />outage estimates for all major pressure zones, including percentage of customers <br />with / without water as a function of time after a major earthquake on either the <br />San Andreas of Hayward faults. For pipelines, we will create electronic lists <br />(excel) that can be used as one of the inputs to an overall pipe-replacement <br />program that also factors in age, leak rate, fire flows, or other factors; the <br />electronic list will identify each pipeline by the "objectID' in the GIS. <br /> <br />· We will meet with the City to describe the fmdings. The City will provide <br />comments which will be factored into subsequent tasks. <br /> <br />October 9, 2009 <br /> <br />Page 4 <br />