SR 06:208 - Laserfiche WebLink

rock type, land use, distance from fault, distance from water sources, and vegetative cover. See the Public Safety Element for a discussion of geologic hazards along with goals, policies and programs related to geologic safety. Water Resources 12 Pleasanton lies within the Alameda Creek watershed, a drainage basin encompassing about 675 square miles between Mount Hamilton and Mount Diablo. Alameda Creek, the principal stream, flows from its origin on Mount Hamilton until it meets the Arroyo de Ia Laguna near Sunol and then runs west through Niles Canyon to San Francisco Bay. The Arroyo de la Laguna collects the surface water runoff from the Tri Valley and carries it south to Alameda Creek. The General Plan Map designates these creeks along with other areas as Public Health and Safety with a Wildlands Overlay Although all creeks feeding the Arroyo de la Laguna are naturally seasonal, Zone 7 of the Alameda County Flood Control and Water Conservation District releases both stored water from the Del Valle Reservoir and imported water from the South Bay Aqueduct into these creeks. These controlled water releases recharge the local groundwater basin underlying the Planning Area. Groundwater recharge is a vital component of natural resource production. The Arroyo de la Laguna, Arroyo del Valle, and part of the Chain of Lakes act as groundwater recharge areas. The Land Use Map designates the Chain of Lakes as Water Management and Recreation, partially due to groundwater recharge functions. See additional discussion, below, under Water Management and Recreation. The arroyos and flood-control channels provide linear natural areas that offer opporturtities for incorporating trails and other recreational uses. Although development has reduced much of Pleasanton's natural habitat, streams and streambeds provide natural habitat commurtities, including freshwater marsh, central coast riparian scrub, riparian woodland, alkali meadow, and valley sink scrub. A special status wildlife species found in Planning Area streams is the Califorrtia red-legged frog. The Chain of Lakes and the San Antonio Reservoir provide additional surface water resources. Shadow Cliffs Regional Recreation Area, which is open to the public for active and passive recreation, incorporates a former gravel quarry as a lake." The San Antonio Reservoir, which provides water to the City and County of San Francisco, is partially located in the Planning Area but is not open to the public. The Chain of Lakes provides additional surface water resources that could be used for passive - and, in the future, possibly active - recreation, as well as waterfowl habitat. 12 Zone 7 Water Agency, Stream Management Master Plan, March 2006. 13 Active recreation refers to physical activities including, but not limited to, sports, games, dancing, exercising, and fishing. Outdoor passive recreation refers to activities compatible with preserving natural and cultural resources, such as wildlife habitat, arroyos, floodplains, and historic resources. Passive recreation includes - but is not limited to - the following activities when they are harmonious with the environment: walking, bicycling, horseback riding, nature and culnrral resource study, photography, and picnicking. Con os EJcmcnt, cc OS2t.Xl6. dean VII-l 0 City Council 8/29/2006