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portion of the Arroyo de Ia Laguna should be designed to retain the existing riparian flora and fauna to the maximum extent possible. In the future, the City will continue to cooperate with Zone 7 to improve and maintain the flood control system. Zone Ts Master Plan includes improvements required as full construction! development of the PIeasanton Planning Area proceeds. As a result of the IOO-year storm event, the potential exists for significant flooding in Pleasanton. Zone 7 predicts that in the future all arroyos in Pleasanton will overtop during a 100-year flood event and continues to educate the public about this potential flooding. Flooding could be aggravated by several problems. First, sediment accumulates in the arroyos and reduces their capacity. Second, removing sediment has the potential for disturbing established wetland habitat. Finally, expanding the size of existing channels would cause significant biological effects. In response to these problems, Zone 7 will divert peak flows from Arroyo Las Positas and Arroyo Mocho to the Chain of Lakes and will, where possible, remove excess arroyo sediment. 9 Alameda County developed the "Chain-of-Lakes" concept in the I 970s. The Chain of Lakes are located between the cities of Livermore and Pleasanton and, when complete, will consist of a series of abandoned gravel quarry pits converted into nine lakes, linked in a series, plus Cope Lake. 10 Thus far the County has established four of these lakes plus Cope Lake. The lakes are used for seasonal water storage and conveyance, and floodwater detention. Water levels are maintained so that stored water can percolate through the sides of the lakes (except for Cope Lake) and help recharge the groundwater basin. The other lakes will be available in the next 10 to 30 years after they have been mined and reclaimed. The City of Pleasanton supports public awareness flood-control programs sponsored by the Federal Emergency Management Agency (FEMA) and desires to increase public awareness about flooding. These programs provide valuable educational information to the general public about flood zones and flood-insurance requirements. The City has had no reoccurring flood losses during the past ten years and FEMA's Community Rating System currently rates PIeasanton "8," with a "I" being the best rating and "10" the worst rating. Pleasanton's rating qualifies its residents for a 10 percent discount on flood-insurance premiums and is an improvement over the City's previous rating of"9."11 It is the City's goal to maintain or improve this rating so as not to increase insurance rates or safety risks for Pleasanton flood-plain-area residents. (See Public Safety Element, Flood Hazards.) SOLID WASTE The solid waste management system in Alameda County includes the collecting, processing, and disposing of solid waste materials. These materials include waste generated from residential, 9 Zone 7, Alameda Connty Flood Control and Water Conservation District ,stream Management Master Plan. Phase I Interim Report. March 2004. 10 Matthew Katen, Registered Geologist, and Certified Hydrogeologist, and Carol D. Mahoney, Registered Geologist, Alameda Connty Flood Control and Water Conservation District, Zone 7, and James. F. Reilly, Professional Engineer, Stetson Engineers, Inc., "Case Study: Chain-of Lakes Project, Alameda Connly, California," paper presented at the Ilih Biennial Symposium of the Gronndwater Recharge, Phoenix, AZ, Jnne 5-7, 2003. II FEMA (Federal Emergency Management Agency): ht1p-/i"ww tem" gnvinfipi..,., ,htm updated October 21, 2005. VI-IS