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7B <br /> Page 18 <br /> The aforementioned conditions support the imposition of fire-protection and life- <br /> safety requirements greater than #hose set forth in the 2006 Edition of the International <br /> Fire Code. <br /> Finding 2: The strongest ground shaking probably will derive from earthquake <br /> activity along the San Andreas, Hayward, or Caiaveras fault. At least one earthquake <br /> of magnitude 7 fio 8-1/4 can be expected during a one hundred year period. In addition, <br /> several earthquakes of magnitude 6 to 7 can be expected in the San Francisco Bay <br /> Region. Any of these earthquakes would cause modera#e to severe shaking throughout <br /> this rerion. The City of Redv,rood City is par�i��larly vulnerable to devastation shou�d <br /> any such ear�hquake occur. <br /> The potential effects of earthquake activity include isolating the City of Redwood <br /> Cii�tiviTi i�t� SUiTOUiiuiti� area and icSiiii.iitlt� Ol'Bliiiaii"iaili�� itlt��'tlal C:iii.UiatlO�i G'UC i0 <br /> the potential for co!lapse of highway overpasses and �nderpasses, along with other <br /> bridges in the city, or an earth slide, and the potential for vertic�l movement rendering <br /> surface travel unduly burdensome or impossible. <br /> Ea�thquakes of the magnitude �xperienced locally can cause major damage to <br /> electrical transmissian facilities which, in tum, cause power failures while at the same <br /> time starting fires throughout the city. The occurrence of multiple fires will quickly <br /> disperse existing fire department resources, thereby reducing andlor deEaying their <br /> response to any given fire. Additionaliy, without electrica! power, elevators, smoke <br /> management systems, lighting systerns, alarm systems and other electrical equipment <br /> needed for building evacuation and fire control in large buildings would be inoperative, <br /> thereby r�sulting in loss of life and/or major losses in such buildings. <br /> Addi#ional potential situations inherent in such an occurrence include loss of city <br /> water resources; Hetch—Hetchy Bay Division Pipelines No. 1 and 2, and Hetch-Hetchy <br /> Bay Division Pipelines No. 3 and 4 would be expecfed to suffer damage2, afong with <br /> inundated areas caused by the faiiure of earthen dams such as Lower Emerald Lake <br /> (Latitude 37° 28.0' N; Longitude 122° 23.2' W } and Bear Gulch (Latitude 37° 26.0' N; <br /> Longitude '#22° 13.6' W}3; underground vvater main breahs due to soil mavement; <br /> cylindrica! water storage tank fiailures due to "elephant's foot" buckfing, weakening from <br /> corrosion, or sloshing nf contents; broken natural gas mains causing structure and ather <br /> fires; ieakage nf hazardous mafieriais; the need fior rescue from collapsed structures; <br /> and the rendering of inedical aid to large numbers of people. <br /> 2 San Francisco Public Utilities Commission: I#s Slow Pace for Assessina Weaknesses in Its Water <br /> f7eliverv Svstem and for Completina Capital Proiects increases the Risk of Service Disruqtions and Water <br /> Sho� rtaqes, Cafifornia State Auditor/Bureau of State Audits, Report Number 99124. <br /> Generalized from maps dam owners are required to prepare and fi[e with the State Office of Emergency <br /> Services and available through the Association�f Bay Area Governments (ABAG). <br /> Ariy/Reso.9762 4 <br /> 120307 <br />