The OS-1 primary open space district regulations are included in the zoning ordinance to achieve the following purposes:
(a) 
To set aside and protect those areas whose primary purpose is to be open space, either natural or designed;
(b) 
To limit development in areas hazardous to human health;
(c) 
To provide sufficient space to meet the community's present and prospective needs for various aesthetic perceptions, recreation requirements and cultural activities;
(d) 
To meet the criteria set forth in the open space and conservation element of the general plan.
(Ord. 946 § 2 (part), 1981)
Those uses so indicated in the open space table, Section 18.54.030, are permitted in the OS-1 district subject to the issuance of conditional use permit by the planning commission.
(Ord. 946 § 2 (part), 1981; Ord. 1112 § 66, 1991; Ord. 1149 § 76, 1992)
The tree removal requirement in an OS-1 district is as follows: Removal of live trees and dead wood shall be allowed upon granting of a tree removal permit by the department of public works.
(Ord. 946 § 2 (part), 1981)