The Table of Contents for this section is available.
The work covered by this section consists of the preparation, shaping, and compaction of either an unstabilized or stabilized roadbed to a condition suitable for placement of base course, pavement, and shoulders. It shall also include the cleaning, shaping, and maintenance of roadway ditches; the stripping of existing vegetation; and the placement and compaction in accordance with Sections 235 and 560 of all materials resulting from the shaping operation. Such work shall extend over those portions of the project which will be paved under the contract.
On those portions of the roadway where there is no pavement to be placed under the contract, the work covered by this section shall be performed under the provisions of Section 225 or Section 230, depending upon the source of the material. The provisions of this Section will not be applicable to such work.
(A) General:
The roadway shall be shaped to conform to the lines, grades, and typical sections shown on the plans or established by the Engineer. All existing vegetation shall be stripped from the ground surface wherever shaping of the roadway is to be done. All suitable surplus material shall be utilized in the construction of the roadway or stockpiled for use in shoulder construction. Surplus material in excess of that needed for roadway or shoulder construction shall be disposed of as waste. Additional material, if needed, shall be obtained from roadway excavation or borrow sources.
All unsuitable material, boulders, and all vegetative matter shall be removed and replaced with suitable material. Suitable material, when not available from the shaping or fine grading operation, shall be obtained from roadway excavation or borrow sources.
Roadway ditches shall be cleaned, reshaped, and maintained in a satisfactory condition until final acceptance of the project.
The Contractor shall conduct his operations in such a manner as to avoid damage to any previously constructed structures and facilities.
(B) Preparation of Subgrade:
The subgrade shall be shaped to the lines, grades, and typical sections shown on the plans. Where the Engineer directs that areas of the subgrade are to be stabilized with aggregate, the subgrade surface in such areas may, subject to the approval of the Engineer, be left uniformly below grade to provide for the addition of the stabilizer material.
Material excavated in preparing the subgrade shall be stored or stockpiled in such a manner as to not interfere with proper drainage or any subsequent operations of stabilization, or placing base or pavement.
(C) Compaction of Subgrade:
All material to a depth of 8 inches below the finished surface of the subgrade shall be compacted to a density equal to at least 100% of that obtained by compacting a sample of the material in accordance with AASHTO T99 as modified by the Department. Copies of these modified testing procedures are available upon request from the Materials and Test Unit.
The subgrade shall be compacted at a moisture content which is approximately that required to produce the maximum density indicated by the above test method. The Contractor shall dry or add moisture to the subgrade when required to provide a uniformly compacted and acceptable subgrade.
Where the subgrade is to be stabilized with lime, aggregate, or cement, the above density requirements will not apply prior to the incorporation of the stabilizing material but compaction shall be in accordance with the requirements of Article 50110, 5103, or 5429, as appropriate.
A tolerance of plus or minus 1/2 inch from the established grade will be permitted after the subgrade has been graded to a uniform surface.
The maximum differential between the established grade and the graded subgrade within any 100 foot section shall be 1/2 inch.
Ditches and drains shall be provided and maintained as may be necessary to satisfactory drain the subgrade. Where previously approved subgrade is damaged by natural causes, by hauling equipment, or by other traffic, the Contractor shall restore the subgrade to the required lines, grades, and typical sections and to the required density at no additional cost to the Department.
The work covered by this section will be paid for at the contract lump sum price for "Fine Grading." Such lump sum price will be full payment for all material excavated to a depth of 0.4 foot below the existing graded surface.
Any material which has been excavated from the subgrade at the depth greater than 0.4 foot below the existing graded surface will be considered unclassified excavation and will be paid for as provided in Article 2258.
As an exception to the above, on those areas in which the Contractor is responsible for constructing the embankment on which the subgrade is located, no payment will be made for that excavation that may be necessary to bring the grade to the established subgrade elevation and typical section. Such surplus material shall be incorporated into the project at no additional cost to the Department.
When sufficient material is not available from the fine grading operation to complete the work of fine grading, additional material will be paid for as provided in Article 2258 for "Unclassified Excavation" or in Article 2306 for "Borrow Excavation," depending on the source of material.
Surplus material stockpiled for shoulder construction and incorporated into the work will be paid for as provided in Article 5605 for "Shoulder Borrow". No payment will be made for the removal and disposal of any surplus material remaining in the stockpile after the shoulders have been completed.
The above prices and payments will be full compensation for all work covered in this section including but not limited to all grading, shaping, and compacting of the roadway; stripping existing vegetation; construction of the subgrade; all cleaning, shaping, and maintaining of the roadway ditches; all hauling; stockpiling of surplus material for the construction of shoulders; and any necessary disposal of surplus stockpile material as waste.
Payment will be made under:
Fine Grading Lump Sum