Asphalt Subgrade, Improved.

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Subgrade, improved as a working platform (1) by the incorporation of granular materials or stabilizers such as asphalt, lime, or portland cement, prepared to support a structure or a pavement system, or (2) any course or courses of select or improved material placed on the subgrade soil below the pavement structure; subgrade improvement does not affect the design thickness of the pavement structure.

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