The construction of a driveway or entranceway from the paved roadway to the private property shall not he less than a six-inch concrete slab of one to six and one-half mix, or six inches of asphaltic concrete on two inches of aggregate base. Where sidewalks exist, or are proposed, the sidewalk grade will control; that is, the sidewalk will be constructed through the drive according to the standard specifications of the City or as directed by the City Engineer. Detailed plans of construction, in duplicate, may be required, showing lot lines, street and curb lines, street inlets or public utility features which may be affected by, or which are immediately adjacent to, the proposed driveway, and such other information as may be necessary, all of which shall be subject to the approval of the City Engineer.