Crosswalks in the city shall be constructed of artificial stone flagging in the manner hereinafter described.  The crosswalk shall be properly graded and shaped to a depth of 12 inches below the intended surface of the pavement.  After the grading is done, a foundation of cinders or mill-tailings, not less than six inches thick, shall be placed upon the subgrade, which shall be consolidated by ramming, to an even surface and moistened just before the concrete is placed thereon.  After the subfoundation has been finished, the artificial stone flagging shall be laid in a good workmanlike manner, the same to consist of two parts; first, bottom course, to be five inches in depth; second, a finishing or wearing course to be one inch in depth.  The bottom course shall be composed of mill-tailing or broken limestone and the best portland cement in above mentioned proportions, shall be mixed dry, then sufficient clear water shall be slowly added by sprinkling while the material is constantly stirred and worked up.  This mass shall be spread on the subfoundation and shall be rammed until the interstices are thoroughly filled with cement. The slab or flag divisions shall be formed by cutting the concrete clear through on the required line as soon as laid; the space made by the cutting tool shall be immediately filled with dry sand and well rammed.  After the bottom course is completed, the finishing or wearing course shall be added.  This shall consist of a stiff mortar composed of one art cement and two parts sand, to be laid to a depth of one-inch.  The surface shall then be cut into flags, the marking to be made directly over the joints in the concrete and cut through the wearing surface. Grooves shall be made six inches apart lengthwise of artificial stone flagging.
(`83 Code, § 14-214)  Penalty, see § 101.99