(1) An oil sump constantly and immediately attended while drilling operations are continuously proceeding.

(2) An excavation covered by Section 24400, 24401 or 24402 of the Health and Safety Code.

(3) An excavation more than one-quarter mile from the nearest highway and within one-half mile of which excavation there are less than 20 residences.

(4) An excavation for the installation of a public utility, if not abandoned.

(5) An excavation in connection with the construction of a private residence, if not abandoned.

(6) A swimming pool, fish pond, wading pool or other outside body of water created by artificial means, designed or used for swimming or other immersion purposes by men, women or children, if it is protected as required by CMC 8.32.040.

(7) An excavation not more than one-half mile in length which becomes a portion of a natural watercourse.

(8) Portable swimming pools. (2002 Code § 17-2.7).