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<br />portion of the Arroyo de la Laguna should be designed to retain the existing riparian flora and fauna
<br />to the maximum extent possible,
<br />
<br />In the future, the City will continue to cooperate with Zone 7 to improve and maintain the flood
<br />control system. Zone 7's Master Plan includes improvements required as full construction!
<br />development of the PIeasanton Planning Area proceeds, As a result of the IOO-year storm event,
<br />the potential exists for significant flooding in Pleasanton. Zone 7 predicts that in the future all
<br />arroyos in PIeasanton will overtop during a IOO-year flood event and continues to educate the
<br />public about this potential flooding, Flooding could be aggravated by several problems, First,
<br />sediment accumulates in the arroyos and reduces their capacity. Second, removing sediment has
<br />the potential for disturbing established wetland habitat. Finally, expanding the size of existing
<br />channels would cause significant biological effects. In response to these problems, Zone 7 will
<br />divert peak flows from Arroyo Las Positas and Arroyo Mocho to the Chain of Lakes and will,
<br />where possible, remove excess arroyo sediment. 9
<br />
<br />Alameda County developed the "Chain-of-Lakes" concept in the 1 970s, The Chain of Lakes are
<br />located between the cities of Livermore and PIeasanton and, when complete, will consist of a series
<br />of abandoned gravel quarry pits converted into nine lakes, linked in a series, plus Cope Lake. 10
<br />Thus far the County has established four of these lakes plus Cope Lake, The lakes are used for
<br />seasonal water storage and conveyance, and floodwater detention, Water levels are maintained so
<br />that stored water can percolate through the sides of the lakes (except for Cope Lake) and help
<br />recharge the groundwater basin, The other lakes will be available in the next 10 to 30 years after
<br />they have been mined and reclaimed.
<br />
<br />The City of PIeasanton supports public awareness flood-control programs sponsored by the Federal
<br />Emergency Management Agency (FEMA) and desires to increase public awareness about
<br />flooding. These programs provide valuable educational information to the general public about
<br />flood zones and flood-insurance requirements, The City has had no reoccurring flood losses during
<br />the past ten years and FEMA's Community Rating System currently rates Pleasanton "8," with a
<br />"1" being the best rating and "10" the worst rating. Pleasanton's rating qualifies its residents for a
<br />10 percent discount on flood-insurance premiums and is an improvement over the City's previous
<br />rating of"9."" It is the City's goal to maintain or improve this rating so as not to increase insurance
<br />rates or safety risks for PIeasanton flood-plain-area residents. (See Public Safety Element, Flood
<br />Hazards.)
<br />
<br />SOLID WASTE
<br />
<br />The solid waste management system in Alameda County includes the collecting, processing, and
<br />disposing of solid waste materials, These materials include waste generated from residential,
<br />
<br />9 Zone 7, Alameda County Flood Control and Water Conservation District ,Stream Management Master Plan, Phase I
<br />Interim Report, March 2004.
<br />
<br />10 Matthew Kalen, Registered Geologist, and Certified Hydrogeologist, and Carol D, Mahoney, Regislered Geologist,
<br />Alameda County Flood Control and Water Conservation District, Zone 7, and James. F, Reilly, Professional Engineer,
<br />Stetson Engineers, Inc., "Case Study: Chain-of Lakes Project, Alameda County, California," paper presented at the
<br />II th Biennial Syrnposiwn of the Groundwater Recharge, Phoenix, AZ, June 5-7, 2003.
<br />
<br />II FEMA (Federal Emergency Managemenl Agency): http'//wwwfem" gnv/nfipi,.,., ,him updated October 21,2005.
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<br />VI-IS
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