(A) Description. This item shall consist of a base course composed of crushed stone constructed on a prepared subgrade in accordance with the drawings and specifications on file in the Zoning Administrator’s office and in conformity with the lines, grades, and typical cross-sections as shown on the accepted drawings.
(B) Materials.
(1) All materials shall comply with state specifications.
(2) Crushed stone shall consist of hard, durable particles or fragments of stone, free from an excess of flat, elongated, soft, or disintegrated pieces, dirt, or other objectionable matter and shall comply with state specifications items 612.2.1 and 612.2.2, size three and size ten for choking.
(C) Construction methods.
(1) Preparation of subgrade. All boulders, organic material, soft clay, spongy material, and any other objectionable material shall be removed and replaced with approved material. The subgrade shall be properly shaped, rolled, and uniformly compacted to conform with the accepted cross-section and grades.
(2) Placing and rolling aggregates. All base course material shall be deposited and spread by means of spreader boxes, or approved mechanical equipment, or from moving vehicles equipped to distribute the material in a uniform layer. Each layer shall be not more than three inches in thickness after compaction and shall be constructed as follows.
(a) Immediately following the spreading of the coarse aggregate, all material placed shall be compacted to the full width by rolling with a smooth wheel power roller weighing eight to ten tons. Rolling shall progress gradually from the sides to the center, parallel with the centerline of the road and lapping uniformly each preceding track by one-half the width of such track and shall continue until all the surface has been rolled and has been thoroughly keyed, the interstices of the stone reduced to a minimum and until it ceases to creep or wave ahead of the roller.
(b) Any irregularities or depressions that develop under such rolling shall be corrected by loosening the material at these places and adding or removing material until the surface is smooth and uniform.
(c) After the coarse aggregate has been thoroughly keyed and set by the rolling described above, choker stone in an amount that will completely fill the interstices shall be applied gradually over the surface and rolling shall be continued while the choker stone is being spread, so that the jarring effect of the roller will cause the small stone to settle into the voids of the coarse aggregate.
(d) The choker stone shall not be dumped in piles on the coarse aggregate but shall be spread in thin layers, either by spreading motion with hand shovels, by mechanical spreading, or directly from trucks. In no case shall the choker stone be applied so fast or thickly as to cake or bridge on the surface in such manner as to prevent the filling of all voids or prevent the direct bearing of the roller on the coarse aggregate.
(e) Hand brooms shall be used to sweep the choker stone into unfilled voids and to distribute the stone where needed. The spreading, sweeping, and rolling shall continue until no more choker stone can be forced into the voids.
(f) Shaping and rolling shall be performed alternately as required to maintain a uniform compacted base until a survade or treatment has been applied to the base.
(g) Along curbs, headers, and walls, and at all places not accessible to the roller, the base course material shall be tamped thoroughly with mechanical tampers or with approved hand tampers.
(3) Seasonal limits. The base course material shall not be deposited or shaped on a frozen or thawing subgrade or during unfavorable weather conditions.
(2005 Code, § 91.46) (Ord. 69, passed 8-2-1966) Penalty, see § 91.99