Upon the subgrade, as hereinabove specified,
there shall be constructed a subbase course conforming to Item 304.05,
Subbase Course - Type 4, of the Construction and Materials Standard
Specifications by the Office of Engineering, New York State Department
of Transportation, as adopted January 2, 1985, or as amended and revised,
except as hereinafter specifically changed and as hereinafter amplified.
Other well-graded, well-draining granular material, including the
existing subgrade, may be acceptable upon approval by the Engineer.
The Engineer may require testing and analysis of the material in order
to determine its suitability.
The compacted subbase course shall have a finished
thickness of not less than six inches. The subbase course shall be
satisfactorily compacted to achieve not less than 95% of Standard
Proctor Maximum Density.