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approximately one-half of the total thickness of the finished base, or enough <br />additional to bear the weight of the construction equipment without disturbing the <br />subgrade. <br />3.2 FINISHING <br />A. For double -coarse bases, blade the first course if necessary to secure a uniform <br />surface and compact to the density specified herein immediately prior to spreading <br />the second course. No other finishing of this course is required. <br />Be After all spreading is completed, scarify the entire surface and shape it to produce <br />the exact grade and cross section after compaction. For double -course bases, <br />scarifying shall slightly penetrate the surface of the first course. <br />C. If at anytime, the subgrade material becomes mixed with the base course material, <br />excavate and remove the mixture, reshape and compact the subgrade, and replace <br />the materials removed with clean base material, shaped and compacted as <br />specified herein. <br />3.3 MOISTURE CONTENT <br />A. If the base material does not have the proper moisture content to obtain the <br />specified density, wet or dry it as required. When water is added, mix it uniformly <br />with the limerock. If wetting or drying is required, these operations shall involve the <br />manipulation of the entire width and depth of the base course before compaction. <br />3.4 COMPACTION <br />A. All limerock base shall be compacted to a minimum of 98 percent of the maximum <br />density as determined by AASHTO T-180. <br />Be Compaction shall be accomplished with a self-propelled steel drum or pneumatic <br />tired roller weighing at least 8 tons. All areas which are low and do not conform to <br />the design template after rolling shall be scarified, filled with well -graded base <br />material and the grading and rolling continued until the base conforms to the design <br />grade and section. <br />C. During final compaction operations, if blading of any area is necessary to obtain the <br />true grade and cross section, complete the compacting operations for such area <br />prior to making the density tests on the finished bases. <br />D. If cracks or checks appear in the base, remove them by rescarifying, reshaping, <br />refilling with limerock where needed, and recompacting, at no cost to the OWNER. <br />02511-2 02511 —Base Course <br />