(a) All street sub-base shall be accurately graded to the required contour of the finished roadway and shall be compacted to at least ninety-eight percent (98%) of the original earth. During compaction, the moisture shall be such that proper compaction can be obtained.
(b) All fill of more than twelve inches shall be filled in eight inch layers and shall be properly compacted. All fill of more than four feet shall be put in under the supervision of a certified test laboratory technician who shall certify that the compaction is within allowable tolerance. Special attention shall be given to compaction over utilities that are under the paved portion of the street. All embankments, whether cut or fill, shall maintain a slope no greater than two feet of run to each one foot of rise. A berm of at least three feet shall be provided on all streets.
(c) When the grade of the street is greater than two percent (2%) a French drain with a proper outlet shall be provided on each side of the street. This drain shall consist of a trench at least one foot wide and at least thirty inches deep. This trench shall be accurately sloped and shall be excavated so that the sides and bottom are straight and properly cleaned of any loose earth. The trench shall then be lined with Typar cut long enough that the sides will turn over the top of the gravel fill to keep earth from filling into the gravel. A four inch perforated PVC pipe shall be laid at the bottom of the trench, inside of the Typar, and the trench shall then be filled with clean, washed gravel. This material shall be two inch river gravel. Extreme care shall be exercised at all times that no earth shall wash into the Typar and gravel during construction. Other drainage shall be provided when signs of water are encountered. On steep grades, a cross ditch of the French drain shall be provided at least every forty feet.
(d) The above under-street drainage may be varied to fit the existing conditions but the described system shall follow the design concept exactly.
(e) All earth surfaces shall be wet down immediately before placing concrete and shall be kept damp at all times that concrete work is in progress.
(f) All streets shall be at least twenty-six feet wide and shall be at least six inches thick, constructed of air entraining Portland cement concrete having an ultimate strength of 4,000 pounds per square inch in twenty-eight days. All streets shall have an integral cast curb six inches high. The concrete for this curb shall be placed before the street concrete shall have taken its initial set.
(g) The strength requirement shall be determined by making three standard 6" X 12" cylinders for each day's pour. These cylinders shall be made by the method recommended by the Portland Cement Association, in the presence of the City Inspector. These cylinders shall be broken at seven days and at twenty-eight days. The third cylinder may be broken to determine when to let traffic on the street, traffic may be allowed when the concrete reaches eighty-five percent (85%) of the required twenty-eight day strength.
(h) All streets shall have a camber of at least three inches.
(i) No concrete shall have slump of more than six inches. This is to be measured by a standard slump cone test.
(j) The surface of the street shall be finished with a rough broom finish. No troweling shall be permitted on the concrete before brooming.
(k) As soon as the concrete has set enough, a heavy coat of an approved curing compound shall cover all surfaces. In no case shall the curing compound wait until the next morning to be applied. No honeycomb will be allowed showing on the edges when the form is stripped. A coat of curing compound shall be applied to edges as soon as the form is stripped.
(l) Any one-half inch, non-extruding expansion joint shall be installed at intervals of no more than fifty feet. Also, an expansion joint shall be provided at each tangent point of a major change of direction, such as street corners or sharp curves. No "L" shaped pieces of pavement will be permitted at any time.
(m) The concrete shall have a deep joint cut at intervals of no more than eleven feet with a deep jointer tool. This jointer shall have a depth of at least one and one-half inches. The center joint in the street may exceed this interval by two feet.
(n) The City Inspector may when he deems it necessary, have the street slab core drilled to determine the thickness and the strength of the concrete. If it is determined that the slab is in compliance, then the City shall pay for the test.
(o) All slopes shall be seeded as soon as possible to eliminate erosion.
(p) No concrete shall be poured on streets when the temperature is below 38 degrees or when the temperature is forecast to go below 32 degrees within the next twenty-four hours.
(q) Any concrete poured on frozen ground shall be removed and replaced.
(r) Concrete shall be protected from freezing for at least seven days and no traffic shall be permitted for fourteen days. The total time that is below 35 degrees shall be added to the fourteen days. Exception to the above time will be permitted when a laboratory test of the concrete indicates that the strength is above eighty-five percent (85%) of the twenty-eight day ultimate required strength.
(Ord. 0-5-88. Passed 2-25-88.)