(A) All excavations shall be refilled in the following manner:
(1) In streets or alleys which have not been macadamized, paved or oiled, and where water is available, and where in the opinion of the Street Superintendent the material excavated can be properly settled by the use of water, the trench may be filled to within not less than one foot from the surface and shall then be thoroughly flooded and the material settled by poling or with shovels.
(2) If required by the Street Superintendent the filling shall be settled at not more than two intermediate depths to be determined by the Street Superintendent before it is brought to within one foot of the surface.
(3) After the material has been allowed to settle, the trench shall be filled to the surface again, flooded and then allowed to settle.
(4) It shall then be filled four inches above the surface of the street and all trenches running parallel to the street shall be thoroughly rolled by the person, firm or corporation refilling such excavation, and with a roller weighing not less than five tons.
(5) If the street, alley or other public place where such excavation is made has been macadamized, paved or oiled, the macadam, pavement or oiled surface removed therefrom shall be kept separate from all other material.
(6) The trench shall be refilled in the manner provided in this chapter, two inches above the surface of such macadamized, paved or oiled street or alley, and all trenches running parallel to the street or alley shall then be rolled by the person refilling such excavation, with a roller weighing not less than five tons.
(7) When such refilling is in proper condition the macadam, pavement or oiled surface torn up or damaged by such excavation shall be replaced by the Superintendent of Streets in accordance with the specifications then in use by the city, for the laying of pavement of the character of that which has been removed.
(8) In all cases where a pipe not exceeding four inches in diameter is placed in an excavation, all the material removed from such excavation shall be replaced therein.
(9) Any surplus material not required in refilling trenches shall be promptly removed by the person, firm or corporation to whom the permit was granted.
(B) Tunnels will be permitted in all excavations in any street or alley between curbs; provided, however, that all such tunnels shall be entirely cut down before same are refilled. No tunnel shall exceed four feet in length.
(`83 Code, § 12.08.050)