(A) Grades. The line and grade, as established by the City Engineer, shall prevail. This grade shall be a uniform incline from the curb line or line established by the City Engineer toward the street line.
(B) Grading. All surplus earth must be removed. No work shall be accepted by the city until the job has been graded and the sidewalk properly backfilled to the satisfaction of the building inspections department.
(C) Railing. In railing, all stakes must be driven or cut off even with the top surface of the rail. Railing must be straight, even and unyielding. When these rails are taken up all stakes must be removed.
(D) Foundation. The contractor shall provide a template of an approved type for checking the subgrade, this template to be the full width of the sidewalk and exact depth of concrete. This template shall be kept on the work at all times. No concrete shall be laid until the foundation has been checked with this template and brought to grade. Whenever a fill is required, sand shall be used. This fill must be well compacted by rolling, tamping or other approved methods.
(E) Thickness and width. The minimum width of sidewalk to be constructed in the city shall be five feet with a thickness of four inches on a two-inch bedding of sand. However, there shall be a thickness of at least six inches through driveway approaches or at any location where motor vehicles will pass over the sidewalk.
(F) Residential driveways. All residential driveway approaches from the edge of the pavement or street or back of curb through the property line, shall be not less than six inches thick concrete containing six sack mix on a minimum of two inches of sand as a sub-base, or as otherwise approved by the City Engineer or his designee. All residential driveways from the property line to the house or garage shall be not less than four inches thick concrete with a six sack mix on a minimum of two inches of sand as a sub- base or an approved asphalt surface installed to meet the specifications in § 97.070.
(G) Concrete aggregates and concrete. Coarse aggregates shall be clean, sound pebbles or crushed stone, 95% of which will be retained on ¾-inch mesh screen and all of which will pass a screen with one- inch square openings. The material shall be uniformly graded between these sizes. Fine aggregate shall be clean sand, the particles of which shall be uniformly graded between sides passing a ¾-inch mesh screen and retained on a 40 mesh screen. Not more than 5% shall pass a 40 mesh screen. Aggregates shall comply with standard tests of ASTM C. 136-39.
(H) Portland cement. Portland cement shall conform to the requirements for type 1 of the tentative specification for air-entrained portland cement ASTM designation C-175. The total air content of the freshly placed concrete shall not be less than 3% and not more than 6% when tested in accordance with the standard method of test for weight per cubic feet yield and air content of concrete, ASTM designation C- 139-44. Sufficient tests for the air content of the concrete shall be made by the contractor at the start of each run or day as the Engineer may specify, and at such additional times as he may require, to assure air entrainment within the specified limits. Water shall be clean and shall contain no substance that may be injurious to concrete. The minimum amount of water shall be used that will produce a workable mix.
(I) Transit mix concrete. Concrete delivered in transit-mixed trucks shall be prepared and delivered in accordance with standards of ASTM C-94-48.
(J) Quality of concrete. The strength of cylinders when tested shall be not less than 3,500 pounds per square inch in 28 days or less than 2,200 pounds per square inch in seven days. Tests shall be made after 28 days unless otherwise stipulated by the City Engineer. Minimum cement content shall be six bags per cubic yard.
(K) Surface finish. Special care shall be observed to tamp concrete adjacent to forms and expansion joints. The concrete when placed in forms and compacted shall show very little if any free water on surface. After concrete has been uniforms placed in forms, the surface shall be struck uniformly to the level of the side rails by using a suitable strength edge after which the surface shall be lightly troweled to a uniform plane. If the owner so desires, the final finish shall include brushing lightly with a calcimine brush dipped in water. All edges of each square shall be neatly finished to a radius of ap proximately ¾-inch with suitable tools. Curing compound shall be used and shall comply with all requirements of the current Michigan Department of State Highways Standard Specifications for highway construction and shall be applied at the rate of not less than one gallon per 200 square feet.
(L) Expansion joints. All concrete sidewalks shall have expansion joints at lot lines placed at right angles to the rails and extending to the bottom of concrete, except where the distance between lot lines exceeds 50 feet additional expansion joints shall be placed so that in no case the distance between expansion joints exceeds 50 feet. All expansion joints shall be prepared expansion paper strips not less than 3/8 inch nor more than 1/3 inch in thickness, except where sidewalks abut the curb at this point one inch expansion paper must be used. When in place this paper must be to the top of the finished surface of the walk. At intervals of no less than five feet nor more than seven feet shall be placed steel dividers ¾-inch thick at right angles to the rails and extending to the bottom of the concrete. These dividers must not be removed until the concrete is sufficiently set to prevent slumping. The dividers shall then be removed and a double edger used to finish the joint. One-half inch expansion paper shall be used where driveways abut the street pavement and sidewalk.
(M) Protection of work. All completed sidewalks and driveways must be protected by suitable barricades of a type approved by the structural/safety division of the fire department. The finished sidewalk must be protected against the elements, particularly rain, to prevent pitting. All barricades must be properly protected by lights during darkness. All shut-off boxes, manholes, coal holes, receiving basins, platform and covers, and any other fixtures must be set to the true grade of the sidewalk, before concrete is poured. In no case shall anyone be allowed to walk on the surface before the concrete is thoroughly set. Barricades should be good and sufficient to guard the public against accident.
(N) Engineer’s stakes. The work to be done will be staked out by the City Engineer, and any stakes broken or removed through carelessness will be replaced by the Engineer at a cost to the contractor of $1 for each stake. The contractor shall give 24 hours notice when he needs the services of the Engineer.
(O) Material on street. Material delivered on the street shall be neatly and compactly piled up along the side of the roadway, in such a manner as to cause the least inconvenience to property owners and to the general public. Private drives and street crossings shall be kept open as far as practicable, and planked when directed to the satisfaction of the Building Inspections Department. Shade trees, lawns and other im provements shall be protected by the contractor from all damage by stone or otherwise.
(P) Supervision and inspection. The structural/safety division of the fire department shall at all times have access for inspection to all branches of the work, and the contractor shall furnish from time to time such samples of each separate ingredient in combination, giving kind and proportion of the materials to be used in the improvement, as may be requested by the structural/safety division of the fire department. When deemed necessary by the Building Inspections Department, the contractor shall store separately and in such manner as to admit of identification any or all materials which he proposes to incorporate in this improvement.
(Q) Weather. The contractor shall suspend all work under this contract when notified by the structural/safety division of the fire department that the weather is unsuitable for carrying it on. If work is allowed during cold or freezing weather, the contractor shall take such additional precaution as the inspector shall require without additional expense to the city, and under no circumstances shall materials which have been affected by the weather be used. No work shall be done between November 15 and April 15, without special permission from the structural/safety division of the fire department.
(R) Defects before acceptance. All settlements, defects or damages in any portion of the sidewalk by public travel, rain, snow, ice, frost or other causes, before the final acceptance of the work by the city, shall be repaired and made good at the contractor’s expense. All rubbish which may accumulate during and by reason of the work herein provided for shall be removed by the contractor as fast as the sidewalk is laid, and the street be left clean and in good condition.
(‘68 Code, § 7-529) (Ord. 146, passed 9-24-57; Am. Ord. 459, passed 10-1-73; Am. Ord. , passed 4-19-99) Penalty, see § 97.999