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<br />-' <br /> <br />Seismic Vulnerability Study <br /> <br />EXHIBIT -A- <br /> <br />Overview <br />The work scope described herein responds to the work requested in Redwood City's <br />"Request For Proposal", dated April 1, 2009, the clarifications made during the meeting <br />between Redwood City, G&E and West Yost held on September 8, 2009, and discussions <br />with Redwood City on October 9,2009. <br /> <br />Task numbering. The work scope described herein uses Task numbers beginning with <br />"1 ". Tasks 1,2 and 3 provide the basic work in response to Task number "8" in the RFP <br />dated April 1, 2009, coupled with requests made during the meeting of September 8, <br />2009. Tasks 4,5 and 6 are optional. <br /> <br />Seismic Vulnerability Study <br /> <br />Task 1 Review Existing Studies, Data Collection, Draft Goals, Draft SIPs <br /> <br />G&E will review the three existing seismic studies for the Redwood City water system. <br />These include the 1982 CH2M-Hill study, the 1995 KJC study and the 2002 G&E study. <br />Each of these studies were based on comparison to codes and guidelines of various <br />vintages, some of which have since been updated or superseded by modem (year 2009) <br />codes and guidelines. <br /> <br />We will develop tables that show the recommendations in each of these 1982-2002 <br />studies, and compare these versus what the City has actually implemented in the interim. <br />The tables will cover the following components: <br /> <br />Summary Table 1 - Seismic Weaknesses and System Impacts <br /> <br />· Geotechnical and geologic hazards <br />· Seismic criteria (return periods, response spectra, ground velocities, liquefaction, <br />landslide, primary (San Andreas, Hayward) and secondary (Serra) faults <br />· Seismic performance of Tanks (reservoirs) <br />· Seismic performance of pump stations (including loss of PG&E power, suitability <br />of emergency generators, quick connects) <br />· Distribution pipelines (including existing seismic weaknesses, joinery, new types <br />of pipes) <br />. SFPUC performance <br />· Emergency preparedness and response <br />· Total system response (including leak rates, water outages, duration of outages, <br />location of outages) <br />· Long term issues ( corrosion, age) <br /> <br />October 9, 2009 <br /> <br />Page 1 <br />