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RW <br />i <br />t <br />rights-of-ways, under parking areas, and the areas tinder and within live <br />feet of proposed buildings shall be precompacted. This precompaetion <br />shall be performed equally on existing ground and on surfaces which have <br />been excavated to remove unsuitable material. The top one foot of said. <br />areas shall be compacted to a minimum density of 95% of maximum as <br />" <br />determined by AASHTO T-180. The maximum spacing between density <br />tests shall be 150 feet. <br />" 7. COMPACTION <br />u A. <br />Backfill material shall be compacted to 95% of maximum density per <br />AASHTO T-180, Equipment suitable and adequate for uniform <br />f <br />compaction to the specified density shall be used for backfill operations <br />` <br />subject to the approval of the Engineer. All compaction equipment shall be <br />_ <br />in good working order and any worn or defective equipment shall be <br />immediately replaced or repaired. <br />8. SOIL <br />STABILITY AND COMPACTION 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 />" <br />by these specifications. Compaction tests shall be taken at intervals listed <br />" <br />herein or as deemed necessary by the 'Engineer. <br />B. <br />Any proposed alternative test methods to those specified herein must be <br />" <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 the tests prove satisfactory and approval is given by the <br />a <br />Engineer. <br />D. <br />In general, it least one test for maximum dry density/optimum moisture <br />content shall be performed on a representative sample of each inherently <br />different material to be used for compacted backfill Or embankment 1111. <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) %hall be liken at locations <br />designated by the Engineer. <br />RW <br />