The purpose and intent of this district is to:

Lands defined herein constitute lands which shall be included in the Open Space Zone. As used in this chapter, unless otherwise apparent from the context, the following definitions shall apply:

The following specific regulations and the general regulations set forth in this title shall apply to all OS districts.

All permitted uses, excluding uses devoted solely for the production of food or fiber within the district, shall be subject to approval for development, construction, or improvement as provided in Chapter 18.76.

All conditional uses within this district shall be subject to approval for development, construction, or improvements as provided in Chapter 18.56.

Walls, fences and hedges exceeding six feet in height shall not be permitted in required yards.

Maximum impervious area and building coverage shall be 6%.

Residential buildings shall not exceed two stories, or 25 feet in height.

Three vehicle spaces shall be required for each dwelling unit.

All applications for a use permit shall be accompanied by a combined in-depth geologic and soil investigation report prepared by a registered geologist, certified by the State of California as an engineering geologist, and by a licensed soils engineer. Such report shall be based on surface, subsurface, and laboratory investigations and examinations and shall fully and clearly present:

No site development review plan or use permit shall be approved unless it includes soils analysis, erosion, and sediment control measures in accordance with adopted procedures, technical standards and specifications of the Soil Conservation Service and/or as prescribed by the City. The applicant shall bear final responsibility for the installation and construction of all required erosion control measures according to the provisions of said standards and specifications.

No building permit shall be issued in the Open Space District unless all needed erosion control measures have been completed or substantially provided for in accordance with said standards and specifications.

The existing natural vegetation and land formations shall remain in a natural state unless modification is found to be necessary for a specific use allowed herein under the site development review or use permit procedure. Imported landscaping, as may be necessary and required, shall consist of indigenous species and/or species determined to be ecologically adaptable and compatible with the existing ecosystem.

Removal of live trees of six inches or more in diameter at the base, shall be prohibited, except with the granting of site development review, use permit or approval of Director as applicable.

Roads, tracks, driveways, trails and other runways for automobiles, trucks, buses, motorcycles, or other wheeled vehicles shall not be developed except upon the approval of site development review or a use permit, as applicable. No such approval shall be granted except upon finding that the purpose for which the roads, tracks, driveways, trails, or runways as proposed, is essential for the establishment or maintenance of a use which is expressly permitted herein and that the design and location of the proposed roads, tracks, trails, or runways will be compatible with the terrain and the purpose of the Open Space District. The use of all roads, tracks, driveways, trails, or runways existing at the time of the adoption of this chapter, which have been established contrary to law, shall be terminated.

No grading shall be authorized except upon the approval of site development review or use permit as applicable. No such approval shall be granted except upon finding that the purpose for which the grading is proposed is essential for the establishment and maintenance of a use which is expressly permitted herein and that the design, scope and location of the grading proposed will be compatible with adjacent areas and will result in the least disturbance of the terrain and natural land features.

Any parcel of land not meeting the area or dimension requirements of this chapter shall be deemed a lawful building site if such parcel was a lawful building site on the effective date of the ordinance codified in this chapter. All other requirements of this chapter shall apply to any such parcel.

Publicly owned lands are not subject to minimum lot size if incorporating such uses as parks, trails, day camps, historical sites and other similar public facilities.