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slopes, and areas of seismic and geologic hazards. The City also requires special treatment of buildings in fire and flood zones, and reviews proposed projects in terms of design impacts. To preserve open space areas surrounding the city that protect public health and safety, the General Plan Map focuses most future development in areas close-in to the city. Wildlands Overlay Wildlands cover much of the south and west portions of the Planrting Area. These lands are located mosdy around the San Antortio Reservoir, Southeast Hills, and the PIeasanton Ridgelands. Wildlands are also adjacent to the Arroyo Mocho, Arroyo de la Laguna, Arroyo del Valle, and Alamo Canal waterways. Other wildlands are located along the railroad tracks and near the Donlon Way and Dublin Canyon culverts. With the exception of the Pleasanton Ridgelands, which are subject to the 1993 Measure F Initiative land use restrictions, the General Plan Map designates these lands as "Wildlands Overlay." Wildlands Overlay areas contain valuable wildlife habitats and communities. They require special attention in order to protect biological diversity and to protect a number of federal- and State-listed special-status species. In most cases, wildlands also function as subregional corridors for wildlife movement between major open space areas including regional parks, wilderness areas, and watershed lands. These lands also enhance the human environment by providing scertic resources and educational opportunities. Land-use designations underlying Wildlife Overlay areas are Public Health and Safety, and Parks and Recreation. The purpose of the Wildlands Overlay is to retain the biological diversity and variety of habitats that might otherwise be lost if the land were developed. To ensure long-term preservation of biological diversity, a variety of habitat types need protection in areas large enough to include viable populations of species which may be present in low numbers. Therefore, wildlands include canyons, ridgetops, grasslands, woodlands, brusWands, riparian corridors, wetlands, arroyos, and streams. Wildland areas are not isolated islands surrounded by development; rather they belong to a major linked system allowing wildlife movement through a regional open-space network. Thus the wildland areas connect the PIeasanton Ridge Regional Park on the west to the Ohlone Wilderness area, on the south to San Francisco Watershed lands, and on the southeast to Del Valle Regional Park. In this way, Pleasanton contributes an important subregional resource that is more valuable than isolated pockets of open space. The primary use of the undeveloped area located along the Arroyo de la Laguna, south of Casdewood Country Club between Foothill Road and 1-680, is as a railroad and flood-control corridor. The General Plan Map designates this area with a Wildlands Overlay because it contains a relatively undisturbed strand of riparian woodland dominated by heritage trees. Preservation of this habitat also Con os Element, CC 082906, dean VIl-31 City Council 8/29/2006