Any person, firm or corporation making any excavation or tunnel in or under any public street, alley or public place in the city shall restore the surface thereof and the subsurface thereof according to the following standards and specifications:
(A) Excavated subgrade beneath the pavement or traveled surface shall be replaced with river sand firmly tamped into place, in layers not greater than six inches to a depth of six inches over the top of the pipe conduit or bottom of the excavation, whichever is higher. The remainder of the excavation shall be filled with grade eight stone and surfaced as provided hereinafter.
(B) Any excavation outside the limits of the pavement shall be replaced by firmly tamping of the material into place in layers not greater than six inches.
(C) Where sand or unstable material is encountered which will not provide a shoulder, the new base of the pavement to be replaced must be extended under the old base for a distance of at least eight inches all around the excavation.
(D) If the street to be excavated is a state highway or city arterial street, the State Division of Highway Specifications shall govern.
(E) The filling for any excavation shall be sound, imperishable material, free from cinders or organic matter. It shall be deposited and thoroughly tamped with a tamper weighing not less than 25 pounds and having a face of not more than eight inches.
(F) Concrete pavements and concrete base or other pavements shall be as thick as the adjoining pavement or base, but in no case shall the pavement or base be less than ten inches thick. The concrete pavement or concrete base shall be full traffic lane width and extend at least two feet beyond the edge of the excavation in all directions.
(G) Concrete mix will be of the same standard as the State Division of Highways Class “X” concrete, or if desired, the same as “rich-mix.”
(H) All concrete shall be reinforced both transversely and longitudinally by embedding steel rods two inches above the bottom of the concrete in the event the original concrete pavement contained reinforcing. Reinforcing bars shall be inch in diameter and transverse bars shall be spaced eight inches apart and longitudinal bars six inches apart. In the event that there was no reinforcing in the original concrete pavement, no reinforcing shall be required in the patchwork.
(I) The surface of all concrete shall be kept moist until it has set sufficiently hard to walk upon, after which it shall be cured by being covered with calcium chloride evenly applied at a rate of not less than two pounds, nor more than two and one-quarter pounds per square yard.
(J) The surface of all pavement shall be finished flush with the surface of the adjoining pavement, and when tested with a ten-foot straight-edge shall show no high spots or depressions of more than one- eighth of an inch. In the case of asphaltic surfaces, the ten-inch concrete base shall be brought to a uniform surface at the proper grade to receive a three-inch course of L-LL asphalt.
(K) All base shall be completed at least ten days before the surface course is replaced.
(L) When it is impossible to replace the asphaltic wearing course in the time specified in the permit for excavation, the concrete base shall be replaced as herein specified, and concrete laid in lieu of the asphaltic wearing course, until the time as the asphaltic wearing course is available, and then the concrete wearing surface shall be removed and replaced with asphalt.
(M) All repaired areas shall be closed to traffic for two weeks or longer unless otherwise directed by the Superintendent of Streets.
(N) Dirt streets or dirt and oil streets shall be repaired by refilling the excavation as provided in this chapter and topping with a two inch layer of asphalt and sealing.
(O) All excavations in asphaltic pavements or dirt and oil streets shall be sealed with suitable bituminous or other sealer approved by the city engineer before applying the asphaltic surface or finished oil surface.
(P) Where excavation is made in a concrete driveway apron, sidewalk, walkway or curb and gutter, the existing pavement material shall be completely removed with clean, neatly sawed lines and the surface restored to the nearest existing construction or expansion joint. Expansion joint material shall be used at all points where new concrete joins with the existing. Strip patching of the above items will not be permitted.
(Ord. 754, passed 11-14-1961; Am. Ord. 1598, passed 12-17-2002)