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21 ATTACHMENT 3
City of Pleasanton
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CITY CLERK
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AGENDA PACKETS
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2021
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072021
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21 ATTACHMENT 3
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7/15/2021 2:13:11 PM
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7/15/2021 1:02:08 PM
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CITY CLERK
CITY CLERK - TYPE
AGENDA REPORT
DOCUMENT DATE
7/20/2021
DESTRUCT DATE
15Y
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21
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\CITY CLERK\AGENDA PACKETS\2021\072021
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<br />80 <br />inactive, faults intersect active or potentially active faults. Any movement of the <br />master fault could trigger adjustments on minor cross faults or adjacent subparallel <br />faults. <br /> <br />City of Pleasanton: See above. <br /> <br />Flood. The area in which LAVWMA, DSRSD, Livermore and Pleasanton provide service, <br />like many regions in California, may be subject to flood damage. The following information about <br />flood risk in that area is derived from the general plan documents for LAVWMA, DSRSD, <br />Livermore, Pleasanton and, where indicated, the cities of Dublin and San Ramon. <br /> <br />Livermore. According to the Federal Emergency Management Agency (“FEMA”), <br />the majority of Livermore is subject to minimal flooding, although there are 100-year flood <br />zones in some portions of Livermore. Most flooding within Livermore is caused by heavy <br />rainfall and subsequent runoff volumes that cannot be adequately conveyed by the <br />existing storm drainage system combined with surface water bodies. Flooding could also <br />result from the catastrophic failure of nearby Del Valle Dam and Patterson Reservoir, <br />which would result in the release of a large volume of water in a relatively short period of <br />time. Livermore is not subject to inundation by coastal hazards. <br /> <br />Pleasanton. According to FEMA information, approximately 1,900 acres in <br />Pleasanton are in the 100-year FEMA flood plain and approximately 3,425 acres are in <br />the 500-year flood plain. In addition, approximately 6,000 acres in Pleasanton are located <br />within the dam failure inundation hazard area for Lake Del Valle Dam. The 235-foot Del <br />Valle Dam impounds a reservoir with a total capacity of 77,100 acre-feet. To provide a <br />flood-protection reserve, it normally stores from 25,000 to 40,000 acre-feet. This dam is <br />under the jurisdiction of the California Department of Water Resources (“DWR”), Division <br />of the Safety of Dams. Existing dams under DWR jurisdiction are periodically inspected to <br />ensure adequate maintenance and to direct the owner to correct any deficiencies found. <br />Dam failure and flooding could potentially cause DSRSD’s sewage treatment plant to <br />overflow, resulting in raw sewage flowing down Alameda Creek leading to short-term <br />negative impacts. <br /> <br />DSRSD. <br /> <br />City of Dublin: According to the Seismic Safety and Safety Element of the <br />City of Dublin’s General Plan, flooding has not been a major problem in the City of <br />Dublin and, as of January 1992, there were no major flood improvement projects <br />needed or planned for the City of Dublin. <br /> <br />City of San Ramon: According to the Safety Element of the City of San <br />Ramon’s General Plan 2020, based on information from FEMA, a majority of <br />Contra Costa County’s creeks and shoreline lie within the 100-year floodplain. <br />Drainage facilities in Contra Costa County are provided by the cities, the County <br />of Contra Costa, and the Contra Costa County Flood Control and Water <br />Conservation District. <br /> <br />City of Pleasanton: See above. <br /> <br />Fire Hazard. The area in which LAVWMA, DSRSD, Livermore and Pleasanton provide <br />service, like many regions in California where development occurs outside an urban core, is an
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