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Paved streets shall meet the specifications of this section.
(a) Excavation. Excavations shall be made in a neat manner and of no greater size than necessary to properly serve their purpose. The sides of the trenches and excavations shall be practically plumb and under no circumstances will they be permitted to be sloped, except upon the specific written permission of the City Engineer or such other person as Council shall designate.
(b) Bracing or Sheeting.
(1) Wherever necessary to prevent undermining of the pavement by sloughing or caving of the trench walls, the applicant shall support the sides and ends of all excavations with braces, sheeting, shores, or stringers of adequate quality and character. All timbering shall be put in place or driven by men skilled in such work and shall be so arranged that it may be withdrawn as refilling proceeds, without injury to the structure in the trench or to any road beds or adjacent structure, or property.
(2) All timbering in excavations shall be withdrawn as the refilling is being done, except where and to such extent as the City Engineer, or such other person as Council shall designate, shall order in writing that such timbering be left in place or where he shall permit the same to be left in place at the applicant's request. Any sheeting left in place shall be cut off eighteen inches below the top of the pavement and the cut-off material removed from the trench.
(1) All excavations shall be refilled as rapidly as practicable after the completion of structural work therein or after the excavations have served their purpose.
(2) Refill shall be made with suitable material removed from the trench or obtained from other sources.
A. Suitable material shall be construed as granular material that will compact readily and which is free from ash, putrescible refuse, trash, large stones and other material judged to be unsatisfactory by the City Engineer, or such other person as Council shall designate. Clay materials may be used as refill material provided the trench is dry at the time of compaction and provided the material is compacted at a moisture content at which lumps or clods are broken down under the action of the compaction equipment to form a uniform compacted mass without void spaces and at which the material does not appear spongy or does not squeeze about under the action of the compaction equipment.
B. Should unsuitable material be encountered in the excavation of the trench, the applicant shall at his own expense remove and dispose of such unsuitable materials at a dump to be found by the applicant and he shall procure and substitute suitable approved material.
(3) Refilling of the trenches shall be commenced by carefully depositing and ramming suitable material in layers not more than four inches thick, measured loose, under, around and over the pipe to a point not less than one foot nor more than two feet in depth over the top thereof, after which refilling of the remainder, the trench may proceed as hereinafter provided. In the refilling of the remainder of the trench stones of no more than six inches in their largest dimension which have been taken out in excavating may be mixed with the earth in the refill in an amount of not over twenty-five percent (25%) and distributed in the earth so that the stones do not nest together and create voids. Excavations shall not be used for the disposal of refuse.
(4) The refilling of the remainder of the trench shall be done by depositing suitable material in the trench in layers not exceeding eight inches loose depth and each layer shall then be compacted with suitable mechanical compaction equipment to not less than ninety percent (90%) of maximum density, as determined by American Association of State Highway Officials Test Designation T-99. The refilling and compaction shall be continued in layers until the trench has been refilled to a level which is ten inches below the surface of the existing pavement.
A. The City Engineer, or such other person as Council shall designate, is empowered to permit other refill and compaction methods to be used as, from time to time, improved compaction equipment and methods become available, provided the applicant demonstrates to the satisfaction of the City Engineer, or such other person as Council shall designate, that such equipment and/or method produces the above specified minimum density.
B. Consolidation of the refill by puddling will not be permitted.
(1) Upon satisfactory completion of the refilling and compacting of the trench or excavation as specified hereinbefore, the pavement opening shall be permanently repaved.
(2) All portland cement concrete shall have a minimum compressive strength at twenty-eight days of 3,500 pounds per square inch and shall be made with high early strength cement meeting the requirements of the Standard Specifications for Portland Cement, ASTM Designation C-150 for Type III. All asphaltic concrete surface course material shall conform to the requirements of the latest edition of the Standard Specifications, Roads and Bridges, of the State Road Commission of West Virginia for Hot-Laid Asphaltic Concrete Wearing Course, Type 1.
(3) Pavement in all cases shall be replaced with a reinforced concrete slab eight inches thick on which shall be placed a surface course of asphaltic concrete two inches thick. The reinforced concrete shall be cured by covering with wetted burlap kept wet for a period of thirty-six hours. After the concrete has been cured and before placing the asphaltic concrete, the surface of the concrete and pavement edges shall be primed with asphaltic concrete, the surface of the concrete and pavement edges shall be primed with an RC-2 cut-back asphalt as a tack coat applied at a rate of approximately five hundredths (0.05) gallons per square yard. When the tack coat has dried sufficiently to become tacky to the touch, the asphaltic concrete surface course material shall be spread, then thoroughly compacted by rolling with a steel wheeled power roller making as may passes as are required to produce a dense, smooth surface.
(e) Cleaning Up. After completion of the street repair, all surplus material, debris, barricades and any other foreign materials shall be removed and the street left in a clean condition.