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4b <br />tests shall be 150 feet. <br />7. COMPACTION <br />A. Backfill material shall be compacted to 95% of maximum density per <br />AASHTO T-180. Equipment suitable and adequate for uniform compaction <br />to the specified density shall be used for backfill operations subject to the <br />approval of the Engineer. All compaction equipment shall be in good <br />working order and auty worn or defective equipment shall be immediately <br />replaced or repaired. <br />8, SOIL. STABILITY AND COMPAMON CONTROL <br />A. <br />The Contractor shall arrange to have sufficient soil tests made by an <br />independent testing laboratory selected by the Engineer to demonstrate <br />conformance of his work with the stability and compaction levels required <br />by these specifications. Compaction tests shall be taken at intervals listed <br />Herein or as deemed necessary by the Engineer. <br />B. <br />Any proposed alternative test methods to those specified herein must be <br />approved by the Engineer prior to testing. At the request of the Engineer, <br />the Contractor shall provide such documentation of a proposed alternative <br />test method as the Engineer may require to evaluate the method for <br />approval. <br />C. <br />In no case shall the Contractor proceed with construction on compacted <br />material until rite tests prove satisfactory anti approval is given by the <br />Engineer. <br />D. <br />In general, at least one test for maximum dry density/optimum moisture <br />content shall be perforated on a representative sample of each inherently <br />different material to be used for compacted backfill or embankment fill. <br />For material of uniform composition and textural class, a minimum of one <br />test per 200 cu. yd. of material shall be performed at the point of use. <br />E. <br />Tests for in-place density (percent compaction) shall be taken at locations <br />designated by the Engineer, <br />