Land may be placed in the O district under the following conditions:
A. When land is in public ownership:
1. Public parks, playgrounds, wildlife preserves, and other public uses,
2. Drainage or flood control channels, creeks, rivers, zanjas and other watercourses,
3. Freeways, parkways and park drives;
B. Privately owned land, when the use of the land would endanger the public health, safety and general welfare:
1. Areas where topography is too steep to build upon or where grading of the land may cause a public hazard due to erosion or flooding,
2. Areas subject to flooding or inundation from storm water,
3. Areas beyond fire servicing, where development might endanger life, property or the watershed;
C. Buffer areas:
1. Areas separating industrial and commercial districts from residential districts. (Ord. 1000 § 31.10, 1955)