The subgrade shall be completed within specification and approved by the Engineer or the designated representative of the Engineer prior to placement of the base material.
A.
The base material shall be placed in lifts not exceeding 8-inches compacted thickness. The material shall be delivered in uniform capacity on approved vehicles. The Contractor shall insure that the required amount of the specified material is uniformly placed for each one hundred foot (100-ft) station. The material placed upon the subgrade shall be spread and shaped on the same day, unless it is impractical to do so or otherwise directed by the Engineer or the designated representative of the Engineer. If it is impractical to spread the material during the first twenty-four (24) hour period, due to poor weather or an unforeseen circumstance, then the material must be scarified and spread as directed by the Engineer or the designated representative of the Engineer. The material shall meet the specified moisture content, and then be manipulated, bladed, rolled and shaped to achieve the sections required on the plans. Areas of segregated coarse and fine material shall be corrected or removed and replaced with well-graded material.
B.
After the material is spread and shaped, it may be essential or desirable for additional binder material to be added. The additional binder will be furnished and applied as directed by the Engineer or the designated representative of the Engineer. The binder material shall be carefully and evenly incorporated with the material in place by scarifying, harrowing, brooming, or other approved methods. The course shall be rolled and sprinkled as required in order to achieve a uniform compaction. The shape of the course shall be maintained by blading, and the surface upon completion shall be smooth and in conformity with the typical sections on plans and to the established lines and grades.
C.
The base course shall be kept open for all traffic, unless otherwise directed by the Engineer or the designated representative of the Engineer. The surface shall be kept free from irregularities and ruts by sprinkling and blading.
D.
Compact flexible base to 95% Modified Proctor density as determined by ASTM D-1557 at a moisture content of 0% to +3% above optimum unless specifically shown otherwise on the plans.
(Ordinance 2007-106, App. B, adopted 3/20/07)
In areas on which surface pavement is to be placed, any deviation over three-eighths (3/8) inch in sixteen (16) feet shall be corrected by loosening, adding or removing material, reshaping, and re-compacting by rolling and sprinkling. The surface course shall be checked for deviations by using a straightedge or template. All depressions, irregularities, or weak spots that develop shall be corrected by scarifying the areas, adding approved material required, reshaping and re-compacting by rolling and sprinkling. Additional base courses may be added once the preceding course has been compacted, cured and is approved by the Engineer or the designated representative of the Engineer.
(Ordinance 2007-106, App. B, adopted 3/20/07)
Allow access to completed portions of flexible base for field density testing by nuclear method.
(Ordinance 2007-106, App. B, adopted 3/20/07)