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File Number: 13-571 <br />Most of the City would be flooded in the event of dam failure at the Lake Chabot or <br />Upper San Leandro Reservoirs. These reservoirs are owned, maintained and operated by the <br />East Bay Municipal Utility District. Such a flood could produce catastrophic damage and <br />casualties in the City. The dams at both reservoirs have been seismically strengthened during <br />the last 30 years, making the risk of failure extremely low. <br />Wildfire. The area of the City east of Interstate 580 is classified as a “moderate” fire <br />hazard by the California Department of Forestry. The lack of a dense tree canopy is a <br />mitigating factor as are the relatively wide streets, gentle slopes and grassland vegetation. <br />Nevertheless, the City lies adjacent to thousands of acres of potentially flammable coastal <br />scrub and forested open space. There are also a number of locations in the City, particularly <br />along San Leandro Creek, with large eucalyptus trees and other highly flammable vegetation <br />and combustible litter. The Uniform Fire Code specifies fire mitigation requirements that are <br />enforced by the City’s Building Division . The City also requires fire-resistant roofing materials <br />in new construction and major remodeling projects. <br />Tsunami. Tsunamis are long-period waves usually caused by off -shore earthquakes or <br />landslides. Because the San Leandro shoreline does not face the open ocean, the City <br />believes that its risk of experiencing a tsunami is very low. A 100-year frequency tsunami <br />would generate a wave run-up of 4.4 feet at the San Leandro shoreline. Most of the shoreline <br />is protected by rip-rap (boulders) and would not be seriously affected . <br />Man-made Calamities <br />Natural Gas Transmission Pipelines. On September 9, 2010 a Pacific Gas and <br />Electric Company (PG&E) high pressure natural gas transmission pipeline exploded in San <br />Bruno, California, with catastrophic results, including loss of life and the destruction of 38 <br />homes. There are two similar transmission pipelines and numerous other types of pipelines <br />owned, operated and maintained by PG&E located throughout the City. <br />PG&E’s website (www.pge.com) provides information regarding its high-pressure <br />natural gas transmission pipelines and its long range natural gas transmission pipeline <br />planning. This information is summarized below. <br />According to its website, PG&E has a comprehensive inspection and monitoring <br />program to ensure the safety of its natural gas transmission pipeline system, and uses a risk <br />management program that inventories each of the 20,000 segments within PG&E’s natural <br />gas transmission pipeline system and evaluates them against criteria such as: <br />·the potential for third party damage like dig-ins from construction, <br />·the potential for corrosion, <br />·the potential for ground movement, and <br />·the physical design and characteristics of the pipe segment. <br />PG&E has also indicated that it considers the proximity of its natural gas transmission <br />Page 4 City of San Leandro Printed on 11/12/2013