Where concrete ringwalls are not provided, the foundation under the shell shall be level to within what tolerances?

±1/8" in any 30' of the circumference and ±1/2" in the total circumference measured from the average elevation

±1/8" in any 10' of the circumference and ±1/2" in the total circumference measured from the average elevation

±1/8" in any 10' of the circumference and ±1/4" in the total circumference measured from the average elevation

±1/8" in any 30' of the circumference and ±1/4" in the total circumference measured from the average elevation