Water service pipes from the curb stop shutoff valve to the meter setting must be laid sufficiently waving, and to such depth, as to prevent rupture from settlement or freezing. After the main or lateral water service lines are laid, the excavation shall be refilled with dirt or manufactured sand. If refilled with dirt, it must be in layers with each layer thoroughly compacted to prevent settlement. The surface of the area excavated must be returned to its condition prior to the excavation and to the satisfaction of the City. The service line shall be of a material specified in the Ankeny Supplemental Specifications.