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SEC. 12.04.05. “OS” OPEN SPACE ZONE.
   (Added by Ord. No. 166,168, Eff. 10/3/90.)
   The following regulations shall apply in the “OS” Open Space Zone:
   A.   Purpose. It is the purpose of the “OS” Open Space Zone to provide regulations for publicly owned land in order to implement the City’s adopted General Plan, including the recreation, parks and open space designations in the City’s adopted district and community plans, and other relevant elements, including the Open Space, Conservation and Public Recreation Elements. Implementation of the General Plan will serve to protect and preserve natural resources and natural features of the environment; to provide outdoor recreation opportunities and advance the public health and welfare; to enhance environmental quality; to encourage the management of public lands in a manner which protects environmental characteristics; and to encourage the maintenance of open pace uses on all publicly owned park and recreation land, and open space public land which is essentially unimproved.
   B.   Use. The following regulations hall apply to publicly owned land classified in the “OS” Open Space Zone: no building, structure or land shall be used and no building or structure shall be erected, moved onto the site, structurally altered, enlarged or maintained, except for the following uses:
   1.   The following uses and activities when conducted in accordance with the limitations hereafter specified.
   (a)   Types of Uses.
   (i)   Parks and recreation facilities, including: bicycle trails, equestrian trails, walking trails, nature trails, park land/lawn areas, childrens' play areas, child care facilities, picnic facilities, and athletic fields (not to exceed 200 seats in park) used for park and recreation purposes. (Amended by Ord. No. 176,545, Eff. 5/2/05.)
   (ii)   Natural resource preserves for the managed production of resources, including, but not limited to, forest lands, waterways and watersheds used for commercial fisheries; agricultural lands used for food and plant production; areas containing major mineral deposits (“G” Surface Mining Districts) and other similar uses.
   (iii)   Marine and ecological preserves, sanctuaries and habitat protection sites.
   (iv)   Sanitary landfill sites which have received certificates of closure in compliance with federal and state regulations.
   (v)   Public water supply reservoirs (uncovered) and accessory uses which are incidental to the operation and continued maintenance of such reservoirs.
   (vi)   Water conservation areas, including percolation basins and flood plain areas.
   (b)   Limitations: (Amended by Ord. No. 169,013, Eff. 9/28/93.)
   (1)   (Amended by Ord. No. 173,492, Eff. 10/10/00.) The use may not be located on land which includes a lake, river, or stream or which is designated by the City as an historic or cultural landmark, unless approved as a conditional use pursuant to Section 12.24 U.19.
   (2)   (Amended by Ord. No. 173,492, Eff. 10/10/00.) Any change of use from a conditional use or deemed to be approved conditional use described in Section 12.24 U.19. of this Code to any of the above uses shall require conditional use approval pursuant to Section 12.24.
   2.   (Amended by Ord. No. 174,132, Eff. 9/3/01.) Conditional uses as allowed pursuant to Section 12.24 U.19. and Section 12.24 W.49. of this Code when the location is approved pursuant to the provisions of the applicable section.