It is the intent of an O-S district:

The O-S, open space zone may be applied to various public, quasi-public and private lands deemed necessary to accomplish the purposes stated above.

Apiaries and open-field animal grazing limited to horses, cattle, sheep and goats, providing such grazing is not part of or conducted in con-junction with any dairy, commercial lot, or livestock sales yard, and; provided further, that no soil tillage, land clearing operation, or spoilation of forested areas is involved in connection with such uses;

Equestrian, hiking, and bicycle trails, roads and other trails;

The construction, installation, operation, and maintenance of public utility distribution and transmission lines, towers and poles, and underground lines or pipes for providing gas, water, electricity, or telephone and telegraph services by public utility companies under the jurisdiction of the Public Utilities Commission of the state of California, if environmentally acceptable, are declared to be compatible uses within the O-S, open space district; however, before any right-of-way for transmission lines or pipelines is acquired, the proposed route shall be submitted to the planning director for review and recommendation. It is not the intent of this section to allow the construction, installation, and maintenance of any type of energy generating facility, electric, gas or water distribution centers, service yards or equipment storage yard;

Timber production and harvest;

Wildlife refuge and game preserve;

Scientific study sites for the systematic exploration and classification of archaeological, anthropological or historic artifacts or remains.

Water collection, storage and distribution uses, including water wells, reservoirs, dams, gauging stations, pumping stations, settling basins, and ground water recharge areas;

Road or trailside rest areas;

Sewage treatment facilities.