The forms for the sidewalks shall be of common stock, two by four sized lumber, straight, sound and free from bad knots or shakes. The shall be set true to line and grade, and unless otherwise ordered, the side next the street shall be set one and one fourth inches lower than the side next the property line. They shall be firmly secured in place so as to resist the spreading stress of the green concrete. The subgrade shall be trimmed and tamped to a firm surface that is uniformly even with the bottom of the forms.
The concrete shall be properly and thoroughly mixed, following the methods commonly approved and used by concrete engineers. In no case will sloppy concrete be allowed. In one course work the concrete must be deposited from the borrows in sufficient quantity to over-fill the forms at each dump, and be raked and tamped down in such a manner as to produce a mortar surface that is free from gravel to a depth of at least one-half inch.
It must be struck to an even surface, following the placing closely with the strike board. At uniform intervals of not to exceed twenty feet an expansion joint must be formed by placing squarely across the walk a strip of Elaterite, a fourfold strip of tarred paper, or a pine, spruce, or cedar board three eighth inch thick by three and one-half inches.
In two course work the base course shall be placed and carefully tamped to a depth of not to exceed three inches, and be followed by the top course as rapidly as practical. In no case should the base course be more than twenty feet ahead of the top course, nor must more than fifteen minutes elapse between placing of any section of the base course and covering it with the top course. Expansion joints are to be placed as specified for one course work.
The forms for the crosswalks are to be so constructed as to produce a walk of the cross-section required by the engineer, and with the top at the true street grade. Expansion joints are to be placed at the ends of the walk, and at two intermediate points where ordered by the engineer. One course work will be allowed in crosswalks.
(Ord. 303 § 5, 1921)