All streets and public ways shall be graded to their full width, as required by the City Manager to the appropriate grade, and shall be surfaced to a minimum width of thirty feet (30′), and all major streets shall be surfaced to a minimum width of forty feet (40′). The cross-section of construction shall contain non-frost, susceptible material to the depth of forty-two inches (42″) or down to sand, as required by the City Manager, from the grade approved by the City, then there shall be added non-frost, susceptible material eighteen inches (18″) of the normal surface grade of the adjacent lots; or, as established by the City Manager, there shall be added thereon gravel approved by the City Manager for a depth of six inches (6″), so the crown of the finished street shall be not less than twelve inches (12″) from normal surface grade of the adjacent lots before compaction of the gravel. Such construction shall be subject to inspection and approval by the City Manager, and shall comply with all applicable City standards for construction. (KC 18-14)