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31 Base course: The part of the construction resting upon the sub-grade and through which the load is transmitted to the sub-grade or the supporting soil. A base course is the layer immediately under the wearing surface. The part of the construction resting upon the sub-grade and through which the load is transmitted to the sub-grade or the supporting soil. A base course is the layer immediately under the wearing surface. The part of the construction resting upon the sub-grade and through which the load is transmitted to the sub-grade or the supporting soil. A base course is the layer immediately under the wearing surface.  

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