A grading permit shall not be required for the following exceptions, but in all other respects the provisions of this chapter shall apply:
(A) An excavation below finished grade for basements and footings of a building, swimming pool or underground structure authorized by a valid building permit;
(B) An excavation or fill authorized by a valid plumbing permit;
(C) Grading by or for a public agency or utility company when specifically exempted by the Engineer;
(D) Minor grading, less than 12 inches in depth, that will not redirect or concentrate existing drainage flows, and of negligible hazard, when specifically exempted by the Engineer.
(`83 Code, § 15.28.060) (Ord. 85-11 § 1 (part), 1985)