A. General Regulations:
1. Fallout Shelters to protect human life during periods of danger may be constructed in or under any required yard, except that if constructed in a front yard or side yard, none of it shall protrude above the average grade of the lot.
2. A subterranean fallout shelter must be constructed within the boundaries of the property, and in the process of construction, no excavation or fill may come within three feet of an adjacent property.