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Unique Farmland consists of lesser quality soils than those in either Prime Farmland or Farmland of Statewide Importance. TIlls farmland has a special combination of urtique characteristics needed to economically produce sustained high yields of a specific crop, such as grapes in vineyards. TIlls land is usually irrigated, but may include non-irrigated lands. Grazing land is land on which existing vegetation is suited for livestock grazing and may be used for dry-land farming. The minimum mapping urtit is 40 acres. Developed land is occupied by structures with a builrting density of at least one urtit to 1.5 acres. Examples include residential, industrial commercial, and institutional uses, and cemeteries, golf courses, and sewage and water structures. Other land is not included in any other mapping category. TIlls could include low-density rural development, woodlands, riparian areas, gravel mining and pits, and water bodies smaller than 40 acres 111 size. Public Health and Safety The General Plan Map designates nearly one-third of the Planning Area mostly in the Southeast Hills as Public Health and Safety. Due to a variety of natural constraints, these lands are designated as open space to discourage development. As discussed in the Public Safety Element, landslide deposits which are prone to soil and seismic instability underlay some of this land. Most of these areas consist of hilly terrain with slopes exceerting 25 percent. TIlls hilly land is unsuitable for development due to difficulties of provirting fire protection and other City services. Protection of these areas also provides valley residents with a scertic resource which contributes to the commurtity's visual identity. The General Plan Map designates the flood plains along the arroyos as well as narrow land strips adjacent to 1-680 and the railroad tracks, as Public Health and Safety. With these designations, the City intends to protect future development from flood, traffic noise, and railroad operation hazards. The City's Scertic Highway Plan describes the strips ofland along 1-680 as supplementing other open space areas and provirting a visual buffer from sound walls." A similar strip separates the Mohr-Martin residential neighborhood from the depleted sand and gravel quarries to the east. A semi-circular strip on the slopes of Mission Hill, near the intersection of Bernal A venue and Sunol Boulevard, is intended to preserve the steep slopes below the Pleasanton Hills neighborhood. Finally, the General Plan Map designates a circular-shaped piece of hilly land bisected by 1-680 northeast of Castlewood Country Club, as Public Health and Safety. TIlls designation is due to its steep terrain and location adjacent to the freeway. By requiring thorough geologic and geotechnical engineering studies, the City restricts development of all lands within hazard areas (see Public Safety Element) inclurting landslide and erosion areas, steep 27 City of Pleasant on, Scenic Highw<;J Plan for Interstate 680 in the Ciry of Pleasanton, January 11, 1985. Con os Element, CC 082906, clean VII-30 City Council 8/29/2006