A. Be not less than four inches in diameter;

B. Be constructed of steel or reinforced concrete;

C. Be placed on no more than four foot centers;

D. Be placed not less than six inches from the edge of the tank;

E. Extend at least three feet under ground;

F. Extend at least three feet above ground;

G. Be protected on all sides of a tank which are exposed to a roadway or other vehicle access.